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File: bug_api.php
<?php
# MantisBT - a php based bugtracking system

# MantisBT is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# MantisBT is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with MantisBT.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Bug API
 * @copyright Copyright (C) 2000 - 2002  Kenzaburo Ito - kenito@300baud.org
 * @copyright Copyright (C) 2002 - 2011  MantisBT Team - mantisbt-dev@lists.sourceforge.net
 * @link http://www.mantisbt.org
 * @package CoreAPI
 * @subpackage BugAPI
 */

/**
 * requires history_api
 */
require_once( 'history_api.php' );
/**
 * requires email_api
 */
require_once( 'email_api.php' );
/**
 * requires bugnote_api
 */
require_once( 'bugnote_api.php' );
/**
 * requires file_api
 */
require_once( 'file_api.php' );
/**
 * requires string_api
 */
require_once( 'string_api.php' );
/**
 * requires sponsorship_api
 */
require_once( 'sponsorship_api.php' );
/**
 * requires twitter_api
 */
require_once( 'twitter_api.php' );
/**
 * requires tag_api
 */
require_once( 'tag_api.php' );
/**
 * requires relationship_api
 */
require_once( 'relationship_api.php' );
/**
 * requires bug_revision_api
 */
require_once( 'bug_revision_api.php' );

/**
 * Bug Data Structure Definition
 * @package MantisBT
 * @subpackage classes
 */
class BugData {
	protected $id;
	protected $project_id = null;
	protected $reporter_id = 0;
	protected $handler_id = 0;
	protected $duplicate_id = 0;
	protected $priority = NORMAL;
	protected $severity = MINOR;
	protected $reproducibility = 10;
	protected $status = NEW_;
	protected $resolution = OPEN;
	protected $projection = 10;
	protected $category_id = 1;
	protected $date_submitted = '';
	protected $last_updated = '';
	protected $eta = 10;
	protected $os = '';
	protected $os_build = '';
	protected $platform = '';
	protected $version = '';
	protected $fixed_in_version = '';
	protected $target_version = '';
	protected $build = '';
	protected $view_state = VS_PUBLIC;
	protected $summary = '';
	protected $sponsorship_total = 0;
	protected $sticky = 0;
	protected $due_date = 0;

	# omitted:
	# var $bug_text_id
	protected $profile_id;

	# extended info
	protected $description = '';
	protected $steps_to_reproduce = '';
	protected $additional_information = '';

	# internal helper objects
	private $_stats = null;

	public $attachment_count = null;
	public $bugnotes_count = null;

	private $loading = false;

	/**
	 * return number of file attachment's linked to current bug
	 * @return int
	 */
	public function get_attachment_count() {
		if ( $this->attachment_count === null ) {
			$this->attachment_count = file_bug_attachment_count( $this->id );
			return $this->attachment_count;
		} else {
			return $this->attachment_count;
		}
	}

	/**
	 * return number of bugnotes's linked to current bug
	 * @return int
	 */
	public function get_bugnotes_count() {
		if ( $this->bugnotes_count === null ) {
			$this->bugnotes_count = self::bug_get_bugnote_count();
			return $this->bugnotes_count;
		} else {
			return $this->bugnotes_count;
		}
	}

	/**
	 * @private
	 */
	public function __set($name, $value) {
		switch ($name) {
			// integer types
			case 'id':
			case 'project_id':
			case 'reporter_id':
			case 'handler_id':
			case 'duplicate_id':
			case 'priority':
			case 'severity':
			case 'reproducibility':
			case 'status':
			case 'resolution':
			case 'projection':
			case 'category_id':
				$value = (int)$value;
				break;
			case 'target_version':
				if ( !$this->loading ) {
					# Only set target_version if user has access to do so
					if( !access_has_project_level( config_get( 'roadmap_update_threshold' ) ) ) {
						trigger_error( ERROR_ACCESS_DENIED, ERROR );
					}
				}
				break;
			case 'due_date':
				if ( !is_numeric( $value ) ) {
					$value = strtotime($value);
				}
				break;
		}
		$this->$name = $value;
	}

	/**
	 * @private
	 */
	public function __get($name) {
		if( $this->is_extended_field($name) )
			$this->fetch_extended_info();
		return $this->{$name};
	}
	
	/**
	 * @private
	 */
	public function __isset($name) {	
		return isset( $this->{$name} );
	}

	/**
	 * fast-load database row into bugobject
	 * @param array $p_row
	 */
	public function loadrow( $p_row ) {
		$this->loading = true;

		foreach( $p_row as $var => $val ) {
			$this->__set( $var, $p_row[$var] );
		}
		$this->loading = false;
	}
	
	/**
	 * Retrieves extended information for bug (e.g. bug description)
	 * @return null
	 */
	private function fetch_extended_info() {
		if ( $this->description == '' ) {				
			$t_text = bug_text_cache_row($this->id);

			$this->description = $t_text['description'];
			$this->steps_to_reproduce = $t_text['steps_to_reproduce'];
			$this->additional_information = $t_text['additional_information'];
		}
	}

	/**
	 * Returns if the field is an extended field which needs fetch_extended_info()
	 * @return boolean
	 */
	private function is_extended_field( $p_field_name ) {
		switch( $p_field_name ) {
			case 'description':
			case 'steps_to_reproduce':
			case 'additional_information':
				return true;
			default:
				return false;
		}
	}

	/**
	 * Returns the number of bugnotes for the given bug_id
	 * @return int number of bugnotes
 	 * @access private
	 * @uses database_api.php
 	 */
	private function bug_get_bugnote_count() {
		if( !access_has_project_level( config_get( 'private_bugnote_threshold' ), $this->project_id ) ) {
			$t_restriction = 'AND view_state=' . VS_PUBLIC;
		} else {
			$t_restriction = '';
		}

		$t_bugnote_table = db_get_table( 'mantis_bugnote_table' );
		$query = "SELECT COUNT(*)
					  FROM $t_bugnote_table
					  WHERE bug_id =" . db_param() . " $t_restriction";
		$result = db_query_bound( $query, Array( $this->bug_id ) );

		return db_result( $result );
	}

	/**
	 * validate current bug object for database insert/update
	 * triggers error on failure
	 * @param bool $p_update_extended
	 */
	function validate( $p_update_extended =  true) {
		# Summary cannot be blank
		if( is_blank( $this->summary ) ) {
			error_parameters( lang_get( 'summary' ) );
			trigger_error( ERROR_EMPTY_FIELD, ERROR );
		}

		if( $p_update_extended ) {
			# Description field cannot be empty
			if( is_blank( $this->description ) ) {
				error_parameters( lang_get( 'description' ) );
				trigger_error( ERROR_EMPTY_FIELD, ERROR );
			}
		}

		# Make sure a category is set
		if( 0 == $this->category_id && !config_get( 'allow_no_category' ) ) {
			error_parameters( lang_get( 'category' ) );
			trigger_error( ERROR_EMPTY_FIELD, ERROR );
		}

		if( !is_blank( $this->duplicate_id ) && ( $this->duplicate_id != 0 ) && ( $this->id == $this->duplicate_id ) ) {
			trigger_error( ERROR_BUG_DUPLICATE_SELF, ERROR );
			# never returns
		}
	}

	/**
	 * Insert a new bug into the database
	 * @return int integer representing the bug id that was created
	 * @access public
	 * @uses database_api.php
	 * @uses lang_api.php
	 */
	function create() {
		self::validate( true );

		# check due_date format
		if( is_blank( $this->due_date ) ) {
			$this_due_date = date_get_null();
		}

		$t_bug_table = db_get_table( 'mantis_bug_table' );
		$t_bug_text_table = db_get_table( 'mantis_bug_text_table' );
		$t_category_table = db_get_table( 'mantis_category_table' );

		# Insert text information
		$query = "INSERT INTO $t_bug_text_table
					    ( description, steps_to_reproduce, additional_information )
					  VALUES
					    ( " . db_param() . ',' . db_param() . ',' . db_param() . ')';
		db_query_bound( $query, Array( $this->description, $this->steps_to_reproduce, $this->additional_information ) );

		# Get the id of the text information we just inserted
		# NOTE: this is guarranteed to be the correct one.
		# The value LAST_INSERT_ID is stored on a per connection basis.

		$t_text_id = db_insert_id( $t_bug_text_table );

		# check to see if we want to assign this right off
		$t_starting_status  = config_get( 'bug_submit_status' );
		$t_original_status = $this->status;

		# if not assigned, check if it should auto-assigned.
		if( 0 == $this->handler_id ) {
			# if a default user is associated with the category and we know at this point
			# that that the bug was not assigned to somebody, then assign it automatically.
			$query = "SELECT user_id
						  FROM $t_category_table
						  WHERE id=" . db_param();
			$result = db_query_bound( $query, array( $this->category_id ) );

			if( db_num_rows( $result ) > 0 ) {
				$this->handler_id = db_result( $result );
			}
		}

		# Check if bug was pre-assigned or auto-assigned.
		if( ( $this->handler_id != 0 ) && ( $this->status == $t_starting_status ) && ( ON == config_get( 'auto_set_status_to_assigned' ) ) ) {
			$t_status = config_get( 'bug_assigned_status' );
		} else {
			$t_status = $this->status;
		}

		# Insert the rest of the data
		$query = "INSERT INTO $t_bug_table
					    ( project_id,reporter_id, handler_id,duplicate_id,
					      priority,severity, reproducibility,status,
					      resolution,projection, category_id,date_submitted,
					      last_updated,eta, bug_text_id,
					      os, os_build,platform, version,build,
					      profile_id, summary, view_state, sponsorship_total, sticky, fixed_in_version,
					      target_version, due_date
					    )
					  VALUES
					    ( " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ",
					      " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ",
					      " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ",
					      " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ",
					      " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ",
					      " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ",
					      " . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ')';

		db_query_bound( $query, Array( $this->project_id, $this->reporter_id, $this->handler_id, $this->duplicate_id, $this->priority, $this->severity, $this->reproducibility, $t_status, $this->resolution, $this->projection, $this->category_id, db_now(), db_now(), $this->eta, $t_text_id, $this->os, $this->os_build, $this->platform, $this->version, $this->build, $this->profile_id, $this->summary, $this->view_state, $this->sponsorship_total, $this->sticky, $this->fixed_in_version, $this->target_version, $this->due_date ) );

		$this->id = db_insert_id( $t_bug_table );

		# log new bug
		history_log_event_special( $this->id, NEW_BUG );

		# log changes, if any (compare happens in history_log_event_direct)
		history_log_event_direct( $this->id, 'status', $t_original_status, $t_status );
		history_log_event_direct( $this->id, 'handler_id', 0, $this->handler_id );

		return $this->id;
	}

	/**
	 * Update a bug from the given data structure
	 *  If the third parameter is true, also update the longer strings table
	 * @param bool p_update_extended
	 * @param bool p_bypass_email Default false, set to true to avoid generating emails (if sending elsewhere)
	 * @return bool (always true)
	 * @access public
	 */
	function update( $p_update_extended = false, $p_bypass_mail = false ) {
		self::validate( $p_update_extended );

		$c_bug_id = $this->id;

		if( is_blank( $this->due_date ) ) {
			$this->due_date = date_get_null();
		}

		$t_old_data = bug_get( $this->id, true );

		$t_bug_table = db_get_table( 'mantis_bug_table' );

		# Update all fields
		# Ignore date_submitted and last_updated since they are pulled out
		#  as unix timestamps which could confuse the history log and they
		#  shouldn't get updated like this anyway.  If you really need to change
		#  them use bug_set_field()
		$query = "UPDATE $t_bug_table
					SET project_id=" . db_param() . ', reporter_id=' . db_param() . ",
						handler_id=" . db_param() . ', duplicate_id=' . db_param() . ",
						priority=" . db_param() . ', severity=' . db_param() . ",
						reproducibility=" . db_param() . ', status=' . db_param() . ",
						resolution=" . db_param() . ', projection=' . db_param() . ",
						category_id=" . db_param() . ', eta=' . db_param() . ",
						os=" . db_param() . ', os_build=' . db_param() . ",
						platform=" . db_param() . ', version=' . db_param() . ",
						build=" . db_param() . ', fixed_in_version=' . db_param() . ',';

		$t_fields = Array(
			$this->project_id, $this->reporter_id,
			$this->handler_id, $this->duplicate_id,
			$this->priority, $this->severity,
			$this->reproducibility, $this->status,
			$this->resolution, $this->projection,
			$this->category_id, $this->eta,
			$this->os, $this->os_build,
			$this->platform, $this->version,
			$this->build, $this->fixed_in_version,
		);
		$t_roadmap_updated = false;
		if( access_has_project_level( config_get( 'roadmap_update_threshold' ) ) ) {
			$query .= "
						target_version=" . db_param() . ",";
			$t_fields[] = $this->target_version;
			$t_roadmap_updated = true;
		}

		$query .= "
						view_state=" . db_param() . ",
						summary=" . db_param() . ",
						sponsorship_total=" . db_param() . ",
						sticky=" . db_param() . ",
						due_date=" . db_param() . "
					WHERE id=" . db_param();
		$t_fields[] = $this->view_state;
		$t_fields[] = $this->summary;
		$t_fields[] = $this->sponsorship_total;
		$t_fields[] = (bool)$this->sticky;
		$t_fields[] = $this->due_date;
		$t_fields[] = $this->id;

		db_query_bound( $query, $t_fields );

		bug_clear_cache( $this->id );

		# log changes
		history_log_event_direct( $c_bug_id, 'project_id', $t_old_data->project_id, $this->project_id );
		history_log_event_direct( $c_bug_id, 'reporter_id', $t_old_data->reporter_id, $this->reporter_id );
		history_log_event_direct( $c_bug_id, 'handler_id', $t_old_data->handler_id, $this->handler_id );
		history_log_event_direct( $c_bug_id, 'priority', $t_old_data->priority, $this->priority );
		history_log_event_direct( $c_bug_id, 'severity', $t_old_data->severity, $this->severity );
		history_log_event_direct( $c_bug_id, 'reproducibility', $t_old_data->reproducibility, $this->reproducibility );
		history_log_event_direct( $c_bug_id, 'status', $t_old_data->status, $this->status );
		history_log_event_direct( $c_bug_id, 'resolution', $t_old_data->resolution, $this->resolution );
		history_log_event_direct( $c_bug_id, 'projection', $t_old_data->projection, $this->projection );
		history_log_event_direct( $c_bug_id, 'category', category_full_name( $t_old_data->category_id, false ), category_full_name( $this->category_id, false ) );
		history_log_event_direct( $c_bug_id, 'eta', $t_old_data->eta, $this->eta );
		history_log_event_direct( $c_bug_id, 'os', $t_old_data->os, $this->os );
		history_log_event_direct( $c_bug_id, 'os_build', $t_old_data->os_build, $this->os_build );
		history_log_event_direct( $c_bug_id, 'platform', $t_old_data->platform, $this->platform );
		history_log_event_direct( $c_bug_id, 'version', $t_old_data->version, $this->version );
		history_log_event_direct( $c_bug_id, 'build', $t_old_data->build, $this->build );
		history_log_event_direct( $c_bug_id, 'fixed_in_version', $t_old_data->fixed_in_version, $this->fixed_in_version );
		if( $t_roadmap_updated ) {
			history_log_event_direct( $c_bug_id, 'target_version', $t_old_data->target_version, $this->target_version );
		}
		history_log_event_direct( $c_bug_id, 'view_state', $t_old_data->view_state, $this->view_state );
		history_log_event_direct( $c_bug_id, 'summary', $t_old_data->summary, $this->summary );
		history_log_event_direct( $c_bug_id, 'sponsorship_total', $t_old_data->sponsorship_total, $this->sponsorship_total );
		history_log_event_direct( $c_bug_id, 'sticky', $t_old_data->sticky, $this->sticky );

		history_log_event_direct( $c_bug_id, 'due_date', ( $t_old_data->due_date != date_get_null() ) ? $t_old_data->due_date : null, ( $this->due_date != date_get_null() ) ? $this->due_date : null );

		# Update extended info if requested
		if( $p_update_extended ) {
			$t_bug_text_table = db_get_table( 'mantis_bug_text_table' );

			$t_bug_text_id = bug_get_field( $c_bug_id, 'bug_text_id' );

			$query = "UPDATE $t_bug_text_table
							SET description=" . db_param() . ",
								steps_to_reproduce=" . db_param() . ",
								additional_information=" . db_param() . "
							WHERE id=" . db_param();
			db_query_bound( $query, Array( $this->description, $this->steps_to_reproduce, $this->additional_information, $t_bug_text_id ) );

			bug_text_clear_cache( $c_bug_id );

			$t_current_user = auth_get_current_user_id();

			if( $t_old_data->description != $this->description ) {
				if ( bug_revision_count( $c_bug_id, REV_DESCRIPTION ) < 1 ) {
					$t_revision_id = bug_revision_add( $c_bug_id, $t_current_user, REV_DESCRIPTION, $t_old_data->description, 0, $t_old_data->last_updated );
				}
				$t_revision_id = bug_revision_add( $c_bug_id, $t_current_user, REV_DESCRIPTION, $this->description );
				history_log_event_special( $c_bug_id, DESCRIPTION_UPDATED, $t_revision_id );
			}

			if( $t_old_data->steps_to_reproduce != $this->steps_to_reproduce ) {
				if ( bug_revision_count( $c_bug_id, REV_STEPS_TO_REPRODUCE ) < 1 ) {
					$t_revision_id = bug_revision_add( $c_bug_id, $t_current_user, REV_STEPS_TO_REPRODUCE, $t_old_data->steps_to_reproduce, 0, $t_old_data->last_updated );
				}
				$t_revision_id = bug_revision_add( $c_bug_id, $t_current_user, REV_STEPS_TO_REPRODUCE, $this->steps_to_reproduce );
				history_log_event_special( $c_bug_id, STEP_TO_REPRODUCE_UPDATED, $t_revision_id );
			}

			if( $t_old_data->additional_information != $this->additional_information ) {
				if ( bug_revision_count( $c_bug_id, REV_ADDITIONAL_INFO ) < 1 ) {
					$t_revision_id = bug_revision_add( $c_bug_id, $t_current_user, REV_ADDITIONAL_INFO, $t_old_data->additional_information, 0, $t_old_data->last_updated );
				}
				$t_revision_id = bug_revision_add( $c_bug_id, $t_current_user, REV_ADDITIONAL_INFO, $this->additional_information );
				history_log_event_special( $c_bug_id, ADDITIONAL_INFO_UPDATED, $t_revision_id );
			}
		}

		# Update the last update date
		bug_update_date( $c_bug_id );

		# allow bypass if user is sending mail separately
		if( false == $p_bypass_mail ) {
			# bug assigned
			if( $t_old_data->handler_id != $this->handler_id ) {
				email_generic( $c_bug_id, 'owner', 'email_notification_title_for_action_bug_assigned' );
				return true;
			}

			# status changed
			if( $t_old_data->status != $this->status ) {
				$t_status = MantisEnum::getLabel( config_get( 'status_enum_string' ), $this->status );
				$t_status = str_replace( ' ', '_', $t_status );
				email_generic( $c_bug_id, $t_status, 'email_notification_title_for_status_bug_' . $t_status );
				return true;
			}

			# @todo handle priority change if it requires special handling
			# generic update notification
			email_generic( $c_bug_id, 'updated', 'email_notification_title_for_action_bug_updated' );
		}

		return true;
	}
}

$g_cache_bug = array();
$g_cache_bug_text = array();

/**
 * Cache a database result-set containing full contents of bug_table row.
 * @param array p_bug_database_result database row containing all columns from mantis_bug_table
 * @param array p_stats (optional) array representing bugnote stats
 * @return array returns an array representing the bug row if bug exists
 * @access public
 */
function bug_cache_database_result( $p_bug_database_result, $p_stats = null ) {
	global $g_cache_bug;

	if( !is_array( $p_bug_database_result ) || isset( $g_cache_bug[(int) $p_bug_database_result['id']] ) ) {
		return $g_cache_bug[(int) $p_bug_database_result['id']];
	}

	return bug_add_to_cache( $p_bug_database_result, $p_stats );
}

/**
 * Cache a bug row if necessary and return the cached copy
 * @param array p_bug_id id of bug to cache from mantis_bug_table
 * @param array p_trigger_errors set to true to trigger an error if the bug does not exist.
 * @return bool|array returns an array representing the bug row if bug exists or false if bug does not exist
 * @access public
 * @uses database_api.php
 */
function bug_cache_row( $p_bug_id, $p_trigger_errors = true ) {
	global $g_cache_bug;

	if( isset( $g_cache_bug[$p_bug_id] ) ) {
		return $g_cache_bug[$p_bug_id];
	}

	$c_bug_id = (int) $p_bug_id;
	$t_bug_table = db_get_table( 'mantis_bug_table' );

	$query = "SELECT *
				  FROM $t_bug_table
				  WHERE id=" . db_param();
	$result = db_query_bound( $query, Array( $c_bug_id ) );

	if( 0 == db_num_rows( $result ) ) {
		$g_cache_bug[$c_bug_id] = false;

		if( $p_trigger_errors ) {
			error_parameters( $p_bug_id );
			trigger_error( ERROR_BUG_NOT_FOUND, ERROR );
		} else {
			return false;
		}
	}

	$row = db_fetch_array( $result );

	return bug_add_to_cache( $row );
}

/**
 * Cache a set of bugs
 * @param array p_bug_id_array integer array representing bug ids to cache
 * @return null
 * @access public
 * @uses database_api.php
 */
function bug_cache_array_rows( $p_bug_id_array ) {
	global $g_cache_bug;
	$c_bug_id_array = array();

	foreach( $p_bug_id_array as $t_bug_id ) {
		if( !isset( $g_cache_bug[(int) $t_bug_id] ) ) {
			$c_bug_id_array[] = (int) $t_bug_id;
		}
	}

	if( empty( $c_bug_id_array ) ) {
		return;
	}

	$t_bug_table = db_get_table( 'mantis_bug_table' );

	$query = "SELECT *
				  FROM $t_bug_table
				  WHERE id IN (" . implode( ',', $c_bug_id_array ) . ')';
	$result = db_query_bound( $query );

	while( $row = db_fetch_array( $result ) ) {
		bug_add_to_cache( $row );
	}
	return;
}

/**
 * Inject a bug into the bug cache
 * @param array p_bug_row bug row to cache
 * @param array p_stats bugnote stats to cache
 * @return null
 * @access private
 */
function bug_add_to_cache( $p_bug_row, $p_stats = null ) {
	global $g_cache_bug;

	$g_cache_bug[(int) $p_bug_row['id']] = $p_bug_row;

	if( !is_null( $p_stats ) ) {
		$g_cache_bug[(int) $p_bug_row['id']]['_stats'] = $p_stats;
	}

	return $g_cache_bug[(int) $p_bug_row['id']];
}

/**
 * Clear a bug from the cache or all bugs if no bug id specified.
 * @param int bug id to clear (optional)
 * @return null
 * @access public
 */
function bug_clear_cache( $p_bug_id = null ) {
	global $g_cache_bug;

	if( null === $p_bug_id ) {
		$g_cache_bug = array();
	} else {
		unset( $g_cache_bug[(int) $p_bug_id] );
	}

	return true;
}

/**
 * Cache a bug text row if necessary and return the cached copy
 * @param int p_bug_id integer bug id to retrieve text for
 * @param bool p_trigger_errors If the second parameter is true (default), trigger an error if bug text not found.
 * @return bool|array returns false if not bug text found or array of bug text
 * @access public
 * @uses database_api.php
 */
function bug_text_cache_row( $p_bug_id, $p_trigger_errors = true ) {
	global $g_cache_bug_text;

	$c_bug_id = (int) $p_bug_id;
	$t_bug_table = db_get_table( 'mantis_bug_table' );
	$t_bug_text_table = db_get_table( 'mantis_bug_text_table' );

	if( isset( $g_cache_bug_text[$c_bug_id] ) ) {
		return $g_cache_bug_text[$c_bug_id];
	}

	$query = "SELECT bt.*
				  FROM $t_bug_text_table bt, $t_bug_table b
				  WHERE b.id=" . db_param() . " AND
				  		b.bug_text_id = bt.id";
	$result = db_query_bound( $query, Array( $c_bug_id ) );

	if( 0 == db_num_rows( $result ) ) {
		$g_cache_bug_text[$c_bug_id] = false;

		if( $p_trigger_errors ) {
			error_parameters( $p_bug_id );
			trigger_error( ERROR_BUG_NOT_FOUND, ERROR );
		} else {
			return false;
		}
	}

	$row = db_fetch_array( $result );

	$g_cache_bug_text[$c_bug_id] = $row;

	return $row;
}

/**
 * Clear a bug's bug text from the cache or all bug text if no bug id specified.
 * @param int bug id to clear (optional)
 * @return null
 * @access public
 */
function bug_text_clear_cache( $p_bug_id = null ) {
	global $g_cache_bug_text;

	if( null === $p_bug_id ) {
		$g_cache_bug_text = array();
	} else {
		unset( $g_cache_bug_text[(int) $p_bug_id] );
	}

	return true;
}

/**
 * Check if a bug exists
 * @param int p_bug_id integer representing bug id
 * @return bool true if bug exists, false otherwise
 * @access public
 */
function bug_exists( $p_bug_id ) {
	if( false == bug_cache_row( $p_bug_id, false ) ) {
		return false;
	} else {
		return true;
	}
}

/**
 * Check if a bug exists. If it doesn't then trigger an error
 * @param int p_bug_id integer representing bug id
 * @return null
 * @access public
 */
function bug_ensure_exists( $p_bug_id ) {
	if( !bug_exists( $p_bug_id ) ) {
		error_parameters( $p_bug_id );
		trigger_error( ERROR_BUG_NOT_FOUND, ERROR );
	}
}

/**
 * check if the given user is the reporter of the bug
 * @param int p_bug_id integer representing bug id
 * @param int p_user_id integer reprenting a user id
 * @return bool return true if the user is the reporter, false otherwise
 * @access public
 */
function bug_is_user_reporter( $p_bug_id, $p_user_id ) {
	if( bug_get_field( $p_bug_id, 'reporter_id' ) == $p_user_id ) {
		return true;
	} else {
		return false;
	}
}

/**
 * check if the given user is the handler of the bug
 * @param int p_bug_id integer representing bug id
 * @param int p_user_id integer reprenting a user id
 * @return bool return true if the user is the handler, false otherwise
 * @access public
 */
function bug_is_user_handler( $p_bug_id, $p_user_id ) {
	if( bug_get_field( $p_bug_id, 'handler_id' ) == $p_user_id ) {
		return true;
	} else {
		return false;
	}
}

/**
 * Check if the bug is readonly and shouldn't be modified
 * For a bug to be readonly the status has to be >= bug_readonly_status_threshold and
 * current user access level < update_readonly_bug_threshold.
 * @param int p_bug_id integer representing bug id
 * @return bool
 * @access public
 * @uses access_api.php
 * @uses config_api.php
 */
function bug_is_readonly( $p_bug_id ) {
	$t_status = bug_get_field( $p_bug_id, 'status' );
	if( $t_status < config_get( 'bug_readonly_status_threshold' ) ) {
		return false;
	}

	if( access_has_bug_level( config_get( 'update_readonly_bug_threshold' ), $p_bug_id ) ) {
		return false;
	}

	return true;
}

/**
 * Check if a given bug is resolved
 * @param int p_bug_id integer representing bug id
 * @return bool true if bug is resolved, false otherwise
 * @access public
 * @uses config_api.php
 */
function bug_is_resolved( $p_bug_id ) {
	$t_status = bug_get_field( $p_bug_id, 'status' );
	return( $t_status >= config_get( 'bug_resolved_status_threshold' ) );
}

/**
 * Check if a given bug is overdue
 * @param int p_bug_id integer representing bug id
 * @return bool true if bug is overdue, false otherwise
 * @access public
 * @uses database_api.php
 */
function bug_is_overdue( $p_bug_id ) {
	$t_due_date = bug_get_field( $p_bug_id, 'due_date' );
	if( !date_is_null( $t_due_date ) ) {
		$t_now = db_now();
		if( $t_now > $t_due_date ) {
			if( !bug_is_resolved( $p_bug_id ) ) {
				return true;
			}
		}
	}
	return false;
}

/**
 * Validate workflow state to see if bug can be moved to requested state
 * @param int p_bug_status current bug status
 * @param int p_wanted_status new bug status
 * @return bool
 * @access public
 * @uses config_api.php
 * @uses utility_api.php
 */
function bug_check_workflow( $p_bug_status, $p_wanted_status ) {
	$t_status_enum_workflow = config_get( 'status_enum_workflow' );

	if( count( $t_status_enum_workflow ) < 1 ) {

		# workflow not defined, use default enum
		return true;
	}

	if ( $p_bug_status == $p_wanted_status ) {
		# no change in state, allow the transition
		return true;
	}

	# workflow defined - find allowed states
	$t_allowed_states = $t_status_enum_workflow[$p_bug_status];

	return MantisEnum::hasValue( $t_allowed_states, $p_wanted_status );
}

/**
 * Copy a bug from one project to another. Also make copies of issue notes, attachments, history,
 * email notifications etc.
 * @todo Not managed FTP file upload
 * @param array p_bug_id integer representing bug id
 * @param int p_target_project_id
 * @param bool p_copy_custom_fields
 * @param bool p_copy_relationships
 * @return int representing the new bugid
 * @access public
 */
function bug_copy( $p_bug_id, $p_target_project_id = null, $p_copy_custom_fields = false, $p_copy_relationships = false, $p_copy_history = false, $p_copy_attachments = false, $p_copy_bugnotes = false, $p_copy_monitoring_users = false ) {
	global $g_db;

	$t_mantis_custom_field_string_table = db_get_table( 'mantis_custom_field_string_table' );
	$t_mantis_bug_file_table = db_get_table( 'mantis_bug_file_table' );
	$t_mantis_bugnote_table = db_get_table( 'mantis_bugnote_table' );
	$t_mantis_bugnote_text_table = db_get_table( 'mantis_bugnote_text_table' );
	$t_mantis_bug_history_table = db_get_table( 'mantis_bug_history_table' );
	$t_mantis_db = $g_db;

	$t_bug_id = db_prepare_int( $p_bug_id );
	$t_target_project_id = db_prepare_int( $p_target_project_id );

	$t_bug_data = bug_get( $t_bug_id, true );

	# retrieve the project id associated with the bug
	if(( $p_target_project_id == null ) || is_blank( $p_target_project_id ) ) {
		$t_target_project_id = $t_bug_data->project_id;
	}

	$t_bug_data->project_id = $t_target_project_id;

	$t_new_bug_id = $t_bug_data->create();

	# MASC ATTENTION: IF THE SOURCE BUG HAS TO HANDLER THE bug_create FUNCTION CAN TRY TO AUTO-ASSIGN THE BUG
	# WE FORCE HERE TO DUPLICATE THE SAME HANDLER OF THE SOURCE BUG
	# @todo VB: Shouldn't we check if the handler in the source project is also a handler in the destination project?
	bug_set_field( $t_new_bug_id, 'handler_id', $t_bug_data->handler_id );

	bug_set_field( $t_new_bug_id, 'duplicate_id', $t_bug_data->duplicate_id );
	bug_set_field( $t_new_bug_id, 'status', $t_bug_data->status );
	bug_set_field( $t_new_bug_id, 'resolution', $t_bug_data->resolution );
	bug_set_field( $t_new_bug_id, 'projection', $t_bug_data->projection );
	bug_set_field( $t_new_bug_id, 'date_submitted', $t_bug_data->date_submitted );
	bug_set_field( $t_new_bug_id, 'last_updated', $t_bug_data->last_updated );
	bug_set_field( $t_new_bug_id, 'eta', $t_bug_data->eta );
	bug_set_field( $t_new_bug_id, 'fixed_in_version', $t_bug_data->fixed_in_version );
	bug_set_field( $t_new_bug_id, 'target_version', $t_bug_data->target_version );
	bug_set_field( $t_new_bug_id, 'sponsorship_total', 0 );
	bug_set_field( $t_new_bug_id, 'sticky', 0 );
	bug_set_field( $t_new_bug_id, 'due_date', $t_bug_data->due_date );

	# COPY CUSTOM FIELDS
	if( $p_copy_custom_fields ) {
		$query = "SELECT field_id, bug_id, value
					   FROM $t_mantis_custom_field_string_table
					   WHERE bug_id=" . db_param();
		$result = db_query_bound( $query, Array( $t_bug_id ) );
		$t_count = db_num_rows( $result );

		for( $i = 0;$i < $t_count;$i++ ) {
			$t_bug_custom = db_fetch_array( $result );

			$c_field_id = db_prepare_int( $t_bug_custom['field_id'] );
			$c_new_bug_id = db_prepare_int( $t_new_bug_id );
			$c_value = $t_bug_custom['value'];

			$query = "INSERT INTO $t_mantis_custom_field_string_table
						   ( field_id, bug_id, value )
						   VALUES (" . db_param() . ', ' . db_param() . ', ' . db_param() . ')';
			db_query_bound( $query, Array( $c_field_id, $c_new_bug_id, $c_value ) );
		}
	}

	# Copy Relationships
	if( $p_copy_relationships ) {
		relationship_copy_all( $t_bug_id, $t_new_bug_id );
	}

	# Copy bugnotes
	if( $p_copy_bugnotes ) {
		$query = "SELECT *
					  FROM $t_mantis_bugnote_table
					  WHERE bug_id=" . db_param();
		$result = db_query_bound( $query, Array( $t_bug_id ) );
		$t_count = db_num_rows( $result );

		for( $i = 0;$i < $t_count;$i++ ) {
			$t_bug_note = db_fetch_array( $result );
			$t_bugnote_text_id = $t_bug_note['bugnote_text_id'];

			$query2 = "SELECT *
						   FROM $t_mantis_bugnote_text_table
						   WHERE id=" . db_param();
			$result2 = db_query_bound( $query2, Array( $t_bugnote_text_id ) );
			$t_count2 = db_num_rows( $result2 );

			$t_bugnote_text_insert_id = -1;
			if( $t_count2 > 0 ) {
				$t_bugnote_text = db_fetch_array( $result2 );

				$query2 = "INSERT INTO $t_mantis_bugnote_text_table
							   ( note )
							   VALUES ( " . db_param() . ' )';
				db_query_bound( $query2, Array( $t_bugnote_text['note'] ) );
				$t_bugnote_text_insert_id = db_insert_id( $t_mantis_bugnote_text_table );
			}

			$query2 = "INSERT INTO $t_mantis_bugnote_table
						   ( bug_id, reporter_id, bugnote_text_id, view_state, date_submitted, last_modified )
						   VALUES ( " . db_param() . ",
						   			" . db_param() . ",
						   			" . db_param() . ",
						   			" . db_param() . ",
						   			" . db_param() . ",
						   			" . db_param() . ')';
			db_query_bound( $query2, Array( $t_new_bug_id, $t_bug_note['reporter_id'], $t_bugnote_text_insert_id, $t_bug_note['view_state'], $t_bug_note['date_submitted'], $t_bug_note['last_modified'] ) );
		}
	}

	# Copy attachments
	if( $p_copy_attachments ) {
	    file_copy_attachments( $t_bug_id , $t_new_bug_id );
	}

	# Copy users monitoring bug
	if( $p_copy_monitoring_users ) {
		bug_monitor_copy( $t_bug_id, $t_new_bug_id );
	}

	# COPY HISTORY
	history_delete( $t_new_bug_id );	# should history only be deleted inside the if statement below?
	if( $p_copy_history ) {
		$query = "SELECT *
					  FROM $t_mantis_bug_history_table
					  WHERE bug_id = " . db_param();
		$result = db_query_bound( $query, Array( $t_bug_id ) );
		$t_count = db_num_rows( $result );

		for( $i = 0;$i < $t_count;$i++ ) {
			$t_bug_history = db_fetch_array( $result );
			$query = "INSERT INTO $t_mantis_bug_history_table
						  ( user_id, bug_id, date_modified, field_name, old_value, new_value, type )
						  VALUES ( " . db_param() . ",
						  		   " . db_param() . ",
						  		   " . db_param() . ",
						  		   " . db_param() . ",
						  		   " . db_param() . ",
						  		   " . db_param() . ",
						  		   " . db_param() . " );";
			db_query_bound( $query, Array( $t_bug_history['user_id'], $t_new_bug_id, $t_bug_history['date_modified'], $t_bug_history['field_name'], $t_bug_history['old_value'], $t_bug_history['new_value'], $t_bug_history['type'] ) );
		}
	}

	return $t_new_bug_id;
}

/**
 * Moves an issue from a project to another.
 * @todo Validate with sub-project / category inheritance scenarios.
 * @todo Fix #11687: Bugs with attachments that are moved will lose attachments.
 * @param int p_bug_id The bug to be moved.
 * @param int p_target_project_id The target project to move the bug to.
 * @access public
 */
function bug_move( $p_bug_id, $p_target_project_id ) {
	// Move the issue to the new project.
	bug_set_field( $p_bug_id, 'project_id', $p_target_project_id );

	// Check if the category for the issue is global or not.
	$t_category_id = bug_get_field( $p_bug_id, 'category_id' );
	$t_category_project_id = category_get_field( $t_category_id, 'project_id' );

	// If not global, then attempt mapping it to the new project.
	if ( $t_category_project_id != ALL_PROJECTS && !project_hierarchy_inherit_parent( $p_target_project_id, $t_category_project_id ) ) {
		// Map by name
		$t_category_name = category_get_field( $t_category_id, 'name' );
		$t_target_project_category_id = category_get_id_by_name( $t_category_name, $p_target_project_id, /* triggerErrors */ false );
		if ( $t_target_project_category_id === false ) {
			// Use default category after moves, since there is no match by name.
			$t_target_project_category_id = config_get( 'default_category_for_moves' );
		}

		bug_set_field( $p_bug_id, 'category_id', $t_target_project_category_id );
	}
}

/**
 * allows bug deletion :
 * delete the bug, bugtext, bugnote, and bugtexts selected
 * @param array p_bug_id integer representing bug id
 * @return bool (always true)
 * @access public
 */
function bug_delete( $p_bug_id ) {
	$c_bug_id = (int) $p_bug_id;
	$t_bug_table = db_get_table( 'mantis_bug_table' );
	$t_bug_text_table = db_get_table( 'mantis_bug_text_table' );

	# call pre-deletion custom function
	helper_call_custom_function( 'issue_delete_validate', array( $p_bug_id ) );

	# log deletion of bug
	history_log_event_special( $p_bug_id, BUG_DELETED, bug_format_id( $p_bug_id ) );

	email_bug_deleted( $p_bug_id );

	# call post-deletion custom function.  We call this here to allow the custom function to access the details of the bug before
	# they are deleted from the database given it's id.  The other option would be to move this to the end of the function and
	# provide it with bug data rather than an id, but this will break backward compatibility.
	helper_call_custom_function( 'issue_delete_notify', array( $p_bug_id ) );

	# Unmonitor bug for all users
	bug_unmonitor( $p_bug_id, null );

	# Delete custom fields
	custom_field_delete_all_values( $p_bug_id );

	# Delete bugnotes
	bugnote_delete_all( $p_bug_id );

	# Delete all sponsorships
	sponsorship_delete( sponsorship_get_all_ids( $p_bug_id ) );

	# MASC RELATIONSHIP
	# we delete relationships even if the feature is currently off.
	relationship_delete_all( $p_bug_id );

	# MASC RELATIONSHIP
	# Delete files
	file_delete_attachments( $p_bug_id );

	# Detach tags
	tag_bug_detach_all( $p_bug_id, false );

	# Delete the bug history
	history_delete( $p_bug_id );

	# Delete bug info revisions
	bug_revision_delete( $p_bug_id );

	# Delete the bugnote text
	$t_bug_text_id = bug_get_field( $p_bug_id, 'bug_text_id' );

	$query = "DELETE FROM $t_bug_text_table
				  WHERE id=" . db_param();
	db_query_bound( $query, Array( $t_bug_text_id ) );

	# Delete the bug entry
	$query = "DELETE FROM $t_bug_table
				  WHERE id=" . db_param();
	db_query_bound( $query, Array( $c_bug_id ) );

	bug_clear_cache( $p_bug_id );
	bug_text_clear_cache( $p_bug_id );

	# db_query errors on failure so:
	return true;
}

/**
 * Delete all bugs associated with a project
 * @param array p_project_id integer representing a projectid
 * @return bool always true
 * @access public
 * @uses database_api.php
 */
function bug_delete_all( $p_project_id ) {
	$c_project_id = (int) $p_project_id;

	$t_bug_table = db_get_table( 'mantis_bug_table' );

	$query = "SELECT id
				  FROM $t_bug_table
				  WHERE project_id=" . db_param();
	$result = db_query_bound( $query, array( $c_project_id ) );

	$bug_count = db_num_rows( $result );

	for( $i = 0;$i < $bug_count;$i++ ) {
		$row = db_fetch_array( $result );

		bug_delete( $row['id'] );
	}

	# @todo should we check the return value of each bug_delete() and
	#  return false if any of them return false? Presumable bug_delete()
	#  will eventually trigger an error on failure so it won't matter...

	return true;
}

/**
 * Returns the extended record of the specified bug, this includes
 * the bug text fields
 * @todo include reporter name and handler name, the problem is that
 *      handler can be 0, in this case no corresponding name will be
 *      found.  Use equivalent of (+) in Oracle.
 * @param int p_bug_id integer representing bug id
 * @return array
 * @access public
 */
function bug_get_extended_row( $p_bug_id ) {
	$t_base = bug_cache_row( $p_bug_id );
	$t_text = bug_text_cache_row( $p_bug_id );

	# merge $t_text first so that the 'id' key has the bug id not the bug text id
	return array_merge( $t_text, $t_base );
}

/**
 * Returns the record of the specified bug
 * @param int p_bug_id integer representing bug id
 * @return array
 * @access public
 */
function bug_get_row( $p_bug_id ) {
	return bug_cache_row( $p_bug_id );
}

/**
 * Returns an object representing the specified bug
 * @param int p_bug_id integer representing bug id
 * @param bool p_get_extended included extended information (including bug_text)
 * @return object BugData Object
 * @access public
 */
function bug_get( $p_bug_id, $p_get_extended = false ) {
	if( $p_get_extended ) {
		$row = bug_get_extended_row( $p_bug_id );
	} else {
		$row = bug_get_row( $p_bug_id );
	}

	$t_bug_data = new BugData;
	$t_bug_data->loadrow( $row );
	return $t_bug_data;
}

function bug_row_to_object( $p_row ) {
	$t_bug_data = new BugData;
	$t_bug_data->loadrow( $p_row );
	return $t_bug_data;
}

/**
 * return the specified field of the given bug
 *  if the field does not exist, display a warning and return ''
 * @param int p_bug_id integer representing bug id
 * @param string p_fieldname field name
 * @return string
 * @access public
 */
function bug_get_field( $p_bug_id, $p_field_name ) {
	$row = bug_get_row( $p_bug_id );

	if( isset( $row[$p_field_name] ) ) {
		return $row[$p_field_name];
	} else {
		error_parameters( $p_field_name );
		trigger_error( ERROR_DB_FIELD_NOT_FOUND, WARNING );
		return '';
	}
}

/**
 * return the specified text field of the given bug
 *  if the field does not exist, display a warning and return ''
 * @param int p_bug_id integer representing bug id
 * @param string p_fieldname field name
 * @return string
 * @access public
 */
function bug_get_text_field( $p_bug_id, $p_field_name ) {
	$row = bug_text_cache_row( $p_bug_id );

	if( isset( $row[$p_field_name] ) ) {
		return $row[$p_field_name];
	} else {
		error_parameters( $p_field_name );
		trigger_error( ERROR_DB_FIELD_NOT_FOUND, WARNING );
		return '';
	}
}

/**
 * return the bug summary
 *  this is a wrapper for the custom function
 * @param int p_bug_id integer representing bug id
 * @param int p_context representing SUMMARY_CAPTION, SUMMARY_FIELD
 * @return string
 * @access public
 * @uses helper_api.php
 */
function bug_format_summary( $p_bug_id, $p_context ) {
	return helper_call_custom_function( 'format_issue_summary', array( $p_bug_id, $p_context ) );
}

/**
 * return the timestamp for the most recent time at which a bugnote
 *  associated with the bug was modified
 * @param int p_bug_id integer representing bug id
 * @return bool|int false or timestamp in integer format representing newest bugnote timestamp
 * @access public
 * @uses database_api.php
 */
function bug_get_newest_bugnote_timestamp( $p_bug_id ) {
	$c_bug_id = db_prepare_int( $p_bug_id );
	$t_bugnote_table = db_get_table( 'mantis_bugnote_table' );

	$query = "SELECT last_modified
				  FROM $t_bugnote_table
				  WHERE bug_id=" . db_param() . "
				  ORDER BY last_modified DESC";
	$result = db_query_bound( $query, Array( $c_bug_id ), 1 );
	$row = db_result( $result );

	if( false === $row ) {
		return false;
	} else {
		return $row;
	}
}

/**
 * return the timestamp for the most recent time at which a bugnote
 *  associated with the bug was modified and the total bugnote
 *  count in one db query
 * @param int p_bug_id integer representing bug id
 * @return object consisting of bugnote stats
 * @access public
 * @uses database_api.php
 */
function bug_get_bugnote_stats( $p_bug_id ) {
	global $g_cache_bug;
	$c_bug_id = db_prepare_int( $p_bug_id );

	if( !is_null( $g_cache_bug[$c_bug_id]['_stats'] ) ) {
		if( $g_cache_bug[$c_bug_id]['_stats'] === false ) {
			return false;
		} else {
			$t_stats = $g_cache_bug[$c_bug_id]['_stats'];
		}
		return $t_stats;
	}

	$t_bugnote_table = db_get_table( 'mantis_bugnote_table' );

	$query = "SELECT last_modified
				  FROM $t_bugnote_table
				  WHERE bug_id=" . db_param() . "
				  ORDER BY last_modified DESC";
	$result = db_query_bound( $query, Array( $c_bug_id ) );
	$row = db_fetch_array( $result );

	if( false === $row ) {
		return false;
	}

	$t_stats['last_modified'] = $row['last_modified'];
	$t_stats['count'] = db_num_rows( $result );

	return $t_stats;
}

/**
 * Get array of attachments associated with the specified bug id.  The array will be
 * sorted in terms of date added (ASC).  The array will include the following fields:
 * id, title, diskfile, filename, filesize, file_type, date_added, user_id.
 * @param int p_bug_id integer representing bug id
 * @return array array of results or null
 * @access public
 * @uses database_api.php
 * @uses file_api.php
 */
function bug_get_attachments( $p_bug_id ) {
	$c_bug_id = db_prepare_int( $p_bug_id );

	$t_bug_file_table = db_get_table( 'mantis_bug_file_table' );

	$query = "SELECT id, title, diskfile, filename, filesize, file_type, date_added, user_id
		                FROM $t_bug_file_table
		                WHERE bug_id=" . db_param() . "
		                ORDER BY date_added";
	$db_result = db_query_bound( $query, Array( $c_bug_id ) );
	$num_files = db_num_rows( $db_result );

	$t_result = array();

	for( $i = 0;$i < $num_files;$i++ ) {
		$t_result[] = db_fetch_array( $db_result );
	}

	return $t_result;
}

# ===================================
# Data Modification
# ===================================
/**
 * Set the value of a bug field
 * @param int p_bug_id integer representing bug id
 * @param string p_field_name pre-defined field name
 * @param any p_value value to set
 * @return bool (always true)
 * @access public
 * @uses database_api.php
 * @uses history_api.php
 */
function bug_set_field( $p_bug_id, $p_field_name, $p_value ) {
	$c_bug_id = db_prepare_int( $p_bug_id );
	$c_value = null;

	switch( $p_field_name ) {

		# bool
		case 'sticky':
			$c_value = $p_value;
			break;

		# int
		case 'project_id':
		case 'reporter_id':
		case 'handler_id':
		case 'duplicate_id':
		case 'priority':
		case 'severity':
		case 'reproducibility':
		case 'status':
		case 'resolution':
		case 'projection':
		case 'category_id':
		case 'eta':
		case 'view_state':
		case 'profile_id':
		case 'sponsorship_total':
			$c_value = (int) $p_value;
			break;

		# string
		case 'os':
		case 'os_build':
		case 'platform':
		case 'version':
		case 'fixed_in_version':
		case 'target_version':
		case 'build':
		case 'summary':
			$c_value = $p_value;
			break;

		# dates
		case 'last_updated':
		case 'date_submitted':
		case 'due_date':
			if ( !is_numeric( $p_value ) ) {
				trigger_error( ERROR_GENERIC, ERROR );
			}
			$c_value = $p_value;
			break;

		default:
			trigger_error( ERROR_DB_FIELD_NOT_FOUND, WARNING );
			break;
	}

	$t_current_value = bug_get_field( $p_bug_id, $p_field_name );

	# return if status is already set
	if( $c_value == $t_current_value ) {
		return true;
	}
	$t_bug_table = db_get_table( 'mantis_bug_table' );

	# Update fields
	$query = "UPDATE $t_bug_table
				  SET $p_field_name=" . db_param() . "
				  WHERE id=" . db_param();
	db_query_bound( $query, Array( $c_value, $c_bug_id ) );

	# updated the last_updated date
	bug_update_date( $p_bug_id );

	# log changes except for duplicate_id which is obsolete and should be removed in
	# MantisBT 1.3.
	switch( $p_field_name ) {
		case 'duplicate_id':
			break;

		case 'category_id':
			history_log_event_direct( $p_bug_id, 'category', category_full_name( $t_current_value, false ), category_full_name( $c_value, false ) );
			break;

		default:
			history_log_event_direct( $p_bug_id, $p_field_name, $t_current_value, $c_value );
	}

	bug_clear_cache( $p_bug_id );

	return true;
}

/**
 * assign the bug to the given user
 * @param array p_bug_id_array integer array representing bug ids to cache
 * @return null
 * @access public
 * @uses database_api.php
 */
function bug_assign( $p_bug_id, $p_user_id, $p_bugnote_text = '', $p_bugnote_private = false ) {
	$c_bug_id = db_prepare_int( $p_bug_id );
	$c_user_id = db_prepare_int( $p_user_id );

	if(( $c_user_id != NO_USER ) && !access_has_bug_level( config_get( 'handle_bug_threshold' ), $p_bug_id, $p_user_id ) ) {
		trigger_error( ERROR_USER_DOES_NOT_HAVE_REQ_ACCESS );
	}

	# extract current information into history variables
	$h_status = bug_get_field( $p_bug_id, 'status' );
	$h_handler_id = bug_get_field( $p_bug_id, 'handler_id' );

	if(( ON == config_get( 'auto_set_status_to_assigned' ) ) && ( NO_USER != $p_user_id ) ) {
		$t_ass_val = config_get( 'bug_assigned_status' );
	} else {
		$t_ass_val = $h_status;
	}

	$t_bug_table = db_get_table( 'mantis_bug_table' );

	if(( $t_ass_val != $h_status ) || ( $p_user_id != $h_handler_id ) ) {

		# get user id
		$query = "UPDATE $t_bug_table
					  SET handler_id=" . db_param() . ", status=" . db_param() . "
					  WHERE id=" . db_param();
		db_query_bound( $query, Array( $c_user_id, $t_ass_val, $c_bug_id ) );

		# log changes
		history_log_event_direct( $c_bug_id, 'status', $h_status, $t_ass_val );
		history_log_event_direct( $c_bug_id, 'handler_id', $h_handler_id, $p_user_id );

		# Add bugnote if supplied ignore false return
		bugnote_add( $p_bug_id, $p_bugnote_text, 0, $p_bugnote_private, 0, '', NULL, FALSE );

		# updated the last_updated date
		bug_update_date( $p_bug_id );

		bug_clear_cache( $p_bug_id );

		# send assigned to email
		email_assign( $p_bug_id );
	}

	return true;
}

/**
 * close the given bug
 * @param int p_bug_id
 * @param string p_bugnote_text
 * @param bool p_bugnote_private
 * @param string p_time_tracking
 * @return bool (always true)
 * @access public
 */
function bug_close( $p_bug_id, $p_bugnote_text = '', $p_bugnote_private = false, $p_time_tracking = '0:00' ) {
	$p_bugnote_text = trim( $p_bugnote_text );

	# Add bugnote if supplied ignore a false return
	# Moved bugnote_add before bug_set_field calls in case time_tracking_no_note is off.
	# Error condition stopped execution but status had already been changed
	bugnote_add( $p_bug_id, $p_bugnote_text, $p_time_tracking, $p_bugnote_private, 0, '', NULL, FALSE );

	bug_set_field( $p_bug_id, 'status', config_get( 'bug_closed_status_threshold' ) );

	email_close( $p_bug_id );
	email_relationship_child_closed( $p_bug_id );

	return true;
}

/**
 * resolve the given bug
 * @return bool (alawys true)
 * @access public
 */
function bug_resolve( $p_bug_id, $p_resolution, $p_fixed_in_version = '', $p_bugnote_text = '', $p_duplicate_id = null, $p_handler_id = null, $p_bugnote_private = false, $p_time_tracking = '0:00' ) {
	$c_resolution = (int) $p_resolution;
	$p_bugnote_text = trim( $p_bugnote_text );

	# Add bugnote if supplied
	# Moved bugnote_add before bug_set_field calls in case time_tracking_no_note is off.
	# Error condition stopped execution but status had already been changed
	bugnote_add( $p_bug_id, $p_bugnote_text, $p_time_tracking, $p_bugnote_private, 0, '', NULL, FALSE );

	$t_duplicate = !is_blank( $p_duplicate_id ) && ( $p_duplicate_id != 0 );
	if( $t_duplicate ) {
		if( $p_bug_id == $p_duplicate_id ) {
			trigger_error( ERROR_BUG_DUPLICATE_SELF, ERROR );

			# never returns
		}

		# the related bug exists...
		bug_ensure_exists( $p_duplicate_id );

		# check if there is other relationship between the bugs...
		$t_id_relationship = relationship_same_type_exists( $p_bug_id, $p_duplicate_id, BUG_DUPLICATE );

		 if( $t_id_relationship > 0 ) {
			# Update the relationship
			relationship_update( $t_id_relationship, $p_bug_id, $p_duplicate_id, BUG_DUPLICATE );

			# Add log line to the history (both bugs)
			history_log_event_special( $p_bug_id, BUG_REPLACE_RELATIONSHIP, BUG_DUPLICATE, $p_duplicate_id );
			history_log_event_special( $p_duplicate_id, BUG_REPLACE_RELATIONSHIP, BUG_HAS_DUPLICATE, $p_bug_id );
		} else if ( $t_id_relationship != -1 ) {
			# Add the new relationship
			relationship_add( $p_bug_id, $p_duplicate_id, BUG_DUPLICATE );

			# Add log line to the history (both bugs)
			history_log_event_special( $p_bug_id, BUG_ADD_RELATIONSHIP, BUG_DUPLICATE, $p_duplicate_id );
			history_log_event_special( $p_duplicate_id, BUG_ADD_RELATIONSHIP, BUG_HAS_DUPLICATE, $p_bug_id );
		} # else relationship is -1 - same type exists, do nothing

		# Copy list of users monitoring the duplicate bug to the original bug
		bug_monitor_copy( $p_bug_id, $p_duplicate_id );

		bug_set_field( $p_bug_id, 'duplicate_id', (int) $p_duplicate_id );
	}

	bug_set_field( $p_bug_id, 'status', config_get( 'bug_resolved_status_threshold' ) );
	bug_set_field( $p_bug_id, 'fixed_in_version', $p_fixed_in_version );
	bug_set_field( $p_bug_id, 'resolution', $c_resolution );

	# only set handler if specified explicitly or if bug was not assigned to a handler
	if( null == $p_handler_id ) {
		if( bug_get_field( $p_bug_id, 'handler_id' ) == 0 ) {
			$p_handler_id = auth_get_current_user_id();
			bug_set_field( $p_bug_id, 'handler_id', $p_handler_id );
		}
	} else {
		bug_set_field( $p_bug_id, 'handler_id', $p_handler_id );
	}

	email_resolved( $p_bug_id );
	email_relationship_child_resolved( $p_bug_id );

	if( $c_resolution >= config_get( 'bug_resolution_fixed_threshold' ) &&
		$c_resolution < config_get( 'bug_resolution_not_fixed_threshold' ) ) {
		twitter_issue_resolved( $p_bug_id );
	}

	return true;
}

/**
 * reopen the given bug
 * @param int p_bug_id
 * @param string p_bugnote_text
 * @param string p_time_tracking
 * @param bool p_bugnote_private
 * @return bool (always true)
 * @access public
 * @uses database_api.php
 * @uses email_api.php
 * @uses bugnote_api.php
 * @uses config_api.php
 */
function bug_reopen( $p_bug_id, $p_bugnote_text = '', $p_time_tracking = '0:00', $p_bugnote_private = false ) {
	$p_bugnote_text = trim( $p_bugnote_text );

	# Add bugnote if supplied
	# Moved bugnote_add before bug_set_field calls in case time_tracking_no_note is off.
	# Error condition stopped execution but status had already been changed
	bugnote_add( $p_bug_id, $p_bugnote_text, $p_time_tracking, $p_bugnote_private, 0, '', NULL, FALSE );

	bug_set_field( $p_bug_id, 'status', config_get( 'bug_reopen_status' ) );
	bug_set_field( $p_bug_id, 'resolution', config_get( 'bug_reopen_resolution' ) );

	email_reopen( $p_bug_id );

	return true;
}

/**
 * updates the last_updated field
 * @param int p_bug_id integer representing bug ids
 * @return bool (always true)
 * @access public
 * @uses database_api.php
 */
function bug_update_date( $p_bug_id ) {
	$c_bug_id = (int) $p_bug_id;

	$t_bug_table = db_get_table( 'mantis_bug_table' );

	$query = "UPDATE $t_bug_table
				  SET last_updated= " . db_param() . "
				  WHERE id=" . db_param();
	db_query_bound( $query, Array( db_now(), $c_bug_id ) );

	bug_clear_cache( $c_bug_id );

	return true;
}

/**
 * enable monitoring of this bug for the user
 * @param int p_bug_id integer representing bug ids
 * @param int p_user_id integer representing user ids
 * @return true if successful, false if unsuccessful
 * @access public
 * @uses database_api.php
 * @uses history_api.php
 * @uses user_api.php
 */
function bug_monitor( $p_bug_id, $p_user_id ) {
	$c_bug_id = (int) $p_bug_id;
	$c_user_id = (int) $p_user_id;

	# Make sure we aren't already monitoring this bug
	if( user_is_monitoring_bug( $c_user_id, $c_bug_id ) ) {
		return true;
	}

	# Don't let the anonymous user monitor bugs
	if ( user_is_anonymous( $c_user_id ) ) {
		return false;
	}

	$t_bug_monitor_table = db_get_table( 'mantis_bug_monitor_table' );

	# Insert monitoring record
	$query = 'INSERT INTO ' . $t_bug_monitor_table . '( user_id, bug_id ) VALUES (' . db_param() . ',' . db_param() . ')';
	db_query_bound( $query, Array( $c_user_id, $c_bug_id ) );

	# log new monitoring action
	history_log_event_special( $c_bug_id, BUG_MONITOR, $c_user_id );

	# updated the last_updated date
	bug_update_date( $p_bug_id );

	email_monitor_added( $p_bug_id, $p_user_id );

	return true;
}

/**
 * Returns the list of users monitoring the specified bug
 * 
 * @param int $p_bug_id
 */
function bug_get_monitors( $p_bug_id ) {
    
    if ( ! access_has_bug_level( config_get( 'show_monitor_list_threshold' ), $p_bug_id ) ) {
        return Array();
    }
    
    
	$c_bug_id = db_prepare_int( $p_bug_id );
	$t_bug_monitor_table = db_get_table( 'mantis_bug_monitor_table' );
	$t_user_table = db_get_table( 'mantis_user_table' );

	# get the bugnote data
	$query = "SELECT user_id, enabled
			FROM $t_bug_monitor_table m, $t_user_table u
			WHERE m.bug_id=" . db_param() . " AND m.user_id = u.id
			ORDER BY u.realname, u.username";
	$result = db_query_bound($query, Array( $c_bug_id ) );
	$num_users = db_num_rows($result);

	$t_users = array();
	for ( $i = 0; $i < $num_users; $i++ ) {
		$row = db_fetch_array( $result );
		$t_users[$i] = $row['user_id'];
	}
	
	user_cache_array_rows( $t_users );
	
	return $t_users;
}

/**
 * Copy list of users monitoring a bug to the monitor list of a second bug
 * @param int p_source_bug_id integer representing the bug ID of the source bug
 * @param int p_dest_bug_id integer representing the bug ID of the destination bug
 * @return bool (always true)
 * @access public
 * @uses database_api.php
 * @uses history_api.php
 * @uses user_api.php
 */
function bug_monitor_copy( $p_source_bug_id, $p_dest_bug_id ) {
	$c_source_bug_id = (int)$p_source_bug_id;
	$c_dest_bug_id = (int)$p_dest_bug_id;

	$t_bug_monitor_table = db_get_table( 'mantis_bug_monitor_table' );

	$query = 'SELECT user_id
		FROM ' . $t_bug_monitor_table . '
		WHERE bug_id = ' . db_param();
	$result = db_query_bound( $query, Array( $c_source_bug_id ) );
	$t_count = db_num_rows( $result );

	for( $i = 0; $i < $t_count; $i++ ) {
		$t_bug_monitor = db_fetch_array( $result );
		if ( !user_is_monitoring_bug( $t_bug_monitor['user_id'], $c_dest_bug_id ) ) {
			$query = 'INSERT INTO ' . $t_bug_monitor_table . ' ( user_id, bug_id )
				VALUES ( ' . db_param() . ', ' . db_param() . ' )';
			db_query_bound( $query, Array( $t_bug_monitor['user_id'], $c_dest_bug_id ) );
			history_log_event_special( $c_dest_bug_id, BUG_MONITOR, $t_bug_monitor['user_id'] );
		}
	}
}

/**
 * disable monitoring of this bug for the user
 * if $p_user_id = null, then bug is unmonitored for all users.
 * @param int p_bug_id integer representing bug ids
 * @param int p_user_id integer representing user ids
 * @return bool (always true)
 * @access public
 * @uses database_api.php
 * @uses history_api.php
 */
function bug_unmonitor( $p_bug_id, $p_user_id ) {
	$c_bug_id = (int) $p_bug_id;
	$c_user_id = (int) $p_user_id;

	$t_bug_monitor_table = db_get_table( 'mantis_bug_monitor_table' );

	# Delete monitoring record
	$query = 'DELETE FROM ' . $t_bug_monitor_table . ' WHERE bug_id = ' . db_param();
	$db_query_params[] = $c_bug_id;

	if( $p_user_id !== null ) {
		$query .= " AND user_id = " . db_param();
		$db_query_params[] = $c_user_id;
	}

	db_query_bound( $query, $db_query_params );

	# log new un-monitor action
	history_log_event_special( $c_bug_id, BUG_UNMONITOR, $c_user_id );

	# updated the last_updated date
	bug_update_date( $p_bug_id );

	return true;
}

/**
 * Pads the bug id with the appropriate number of zeros.
 * @param int p_bug_id
 * @return string
 * @access public
 * @uses config_api.php
 */
function bug_format_id( $p_bug_id ) {
	$t_padding = config_get( 'display_bug_padding' );
	$t_string = utf8_str_pad( $p_bug_id, $t_padding, '0', STR_PAD_LEFT );

	return event_signal( 'EVENT_DISPLAY_BUG_ID', $t_string, array( $p_bug_id ) );
}