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File: sponsorship_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/>.

/**
 * Sponsorship API
 * @package CoreAPI
 * @subpackage SponsorshipAPI
 * @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
 */

/**
 * requires email_api
 */
require_once( 'email_api.php' );
/**
 * requires bug_api
 */
require_once( 'bug_api.php' );
/**
 * requires history_api
 */
require_once( 'history_api.php' );

/**
 * Sponsorship Data Structure Definition
 * @package MantisBT
 * @subpackage classes
 */
class SponsorshipData {
	var $id = 0;
	var $bug_id = 0;
	var $user_id = 0;
	var $amount = 0;
	var $logo = '';
	var $url = '';
	var $paid = 0;

	var $date_submitted = '';
	var $last_updated = '';
}

# ########################################
# SECURITY NOTE: cache globals are initialized here to prevent them
#   being spoofed if register_globals is turned on

$g_cache_sponsorships = array();

/**
 * Cache a sponsorship row if necessary and return the cached copy
 * If the second parameter is true (default), trigger an error
 * if the sponsorship can't be found.  If the second parameter is
 * false, return false if the sponsorship can't be found.
 * @param int $p_sponsorship_id
 * @param bool $p_trigger_errors
 * @return array
 */
function sponsorship_cache_row( $p_sponsorship_id, $p_trigger_errors = true ) {
	global $g_cache_sponsorships;

	$c_sponsorship_id = db_prepare_int( $p_sponsorship_id );
	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

	if( isset( $g_cache_sponsorships[$c_sponsorship_id] ) ) {
		return $g_cache_sponsorships[$c_sponsorship_id];
	}

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

	if( 0 == db_num_rows( $result ) ) {
		$g_cache_sponsorships[$c_sponsorship_id] = false;

		if( $p_trigger_errors ) {
			error_parameters( $p_sponsorship_id );
			trigger_error( ERROR_SPONSORSHIP_NOT_FOUND, ERROR );
		} else {
			return false;
		}
	}

	$row = db_fetch_array( $result );
	$g_cache_sponsorships[$c_sponsorship_id] = $row;

	return $row;
}

/**
 * Clear the sponsorship cache (or just the given id if specified)
 * @param int $p_sponsorship_id
 * @return null
 */
function sponsorship_clear_cache( $p_sponsorship_id = null ) {
	global $g_cache_sponsorships;

	if( $p_sponsorship_id === null ) {
		$g_cache_sponsorships = array();
	} else {
		$c_sponsorship_id = db_prepare_int( $p_sponsorship_id );
		unset( $g_cache_sponsorships[$c_sponsorship_id] );
	}
}

/**
 * check to see if sponsorship exists by id
 * return true if it does, false otherwise
 * @param int $p_sponsorship_id
 * @return bool
 */
function sponsorship_exists( $p_sponsorship_id ) {
	return sponsorship_cache_row( $p_sponsorship_id, false ) !== false;
}

/**
 * return false if not found
 * otherwise returns sponsorship id
 * @param int $p_bug_id
 * @param int $p_user_id
 * @return int|false
 */
function sponsorship_get_id( $p_bug_id, $p_user_id = null ) {
	$c_bug_id = db_prepare_int( $p_bug_id );

	if( $p_user_id === null ) {
		$c_user_id = auth_get_current_user_id();
	} else {
		$c_user_id = db_prepare_int( $p_user_id );
	}

	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

	$query = "SELECT id FROM $t_sponsorship_table WHERE bug_id = " . db_param() . " AND user_id = " . db_param();
	$t_result = db_query_bound( $query, Array( $c_bug_id, $c_user_id ), 1 );

	if( db_num_rows( $t_result ) == 0 ) {
		return false;
	}

	$row = db_fetch_array( $t_result );

	return (integer) $row['id'];
}

/**
 * get information about a sponsorship given its id
 * @param int $p_sponsorship_id
 * @return array
 */
function sponsorship_get( $p_sponsorship_id ) {
	$row = sponsorship_cache_row( $p_sponsorship_id );

	$t_sponsorship_data = new SponsorShipData;
	$t_row_keys = array_keys( $row );
	$t_vars = get_object_vars( $t_sponsorship_data );

	# Check each variable in the class
	foreach( $t_vars as $var => $val ) {
		# If we got a field from the DB with the same name
		if( in_array( $var, $t_row_keys, true ) ) {
			# Store that value in the object
			$t_sponsorship_data->$var = $row[$var];
		}
	}

	return $t_sponsorship_data;
}

/**
 * Return an array of Sponsorships associated with the specified bug id
 * @param int $p_bug_id
 * @return array
 */
function sponsorship_get_all_ids( $p_bug_id ) {
	global $g_cache_sponsorships;
	static $s_cache_sponsorship_bug_ids = array();

	$c_bug_id = db_prepare_int( $p_bug_id );
	
	if( isset( $s_cache_sponsorship_bug_ids[$c_bug_id] ) ) {
		return $s_cache_sponsorship_bug_ids[$c_bug_id];
	}

	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

	$query = "SELECT * FROM $t_sponsorship_table
				WHERE bug_id = " . db_param();
	$t_result = db_query_bound( $query, Array( $c_bug_id ) );

	$t_sponsorship_ids = array();
	while( $row = db_fetch_array( $t_result ) ) {
		$t_sponsorship_ids[] = $row['id'];
		$g_cache_sponsorships[(int)$row['id']] = $row;
	}

	$s_cache_sponsorship_bug_ids[$c_bug_id] = $t_sponsorship_ids;

	return $t_sponsorship_ids;
}

/**
 * Get the amount of sponsorships for the specified id(s)
 * handles the case where $p_sponsorship_id is an array or an id.
 * @param int $p_sponsorship_id
 * @return int
 */
function sponsorship_get_amount( $p_sponsorship_id ) {
	if( is_array( $p_sponsorship_id ) ) {
		$t_total = 0;

		foreach( $p_sponsorship_id as $id ) {
			$t_total += sponsorship_get_amount( $id );
		}

		return $t_total;
	} else {
		$sponsorship = sponsorship_get( $p_sponsorship_id );
		return $sponsorship->amount;
	}
}

/**
 * Return the currency used for all sponsorships
 * @return string
 */
function sponsorship_get_currency() {
	return config_get( 'sponsorship_currency' );
}

/**
 * This function should return the string in a globalized format.
 * @param int $p_amount
 * @return string
 * @todo add some currency formating in the future
 */
function sponsorship_format_amount( $p_amount ) {
	$t_currency = sponsorship_get_currency();
	return $t_currency . ' ' . $p_amount;
}

/**
 * Update bug to reflect sponsorship change
 * This is to be called after adding/updating/deleting sponsorships
 * @param int $p_bug_id
 * @return null
 */
function sponsorship_update_bug( $p_bug_id ) {
	$t_total_amount = sponsorship_get_amount( sponsorship_get_all_ids( $p_bug_id ) );
	bug_set_field( $p_bug_id, 'sponsorship_total', $t_total_amount );
	bug_update_date( $p_bug_id );
}

/**
 * if sponsorship contains a non-zero id, then update the corresponding record.
 * if sponsorship contains a zero id, search for bug_id/user_id, if found, then update the entry
 * otherwise add a new entry
 * @param int $p_sponsorship
 * @return int
 */
function sponsorship_set( $p_sponsorship ) {
	$t_min_sponsorship = config_get( 'minimum_sponsorship_amount' );
	if( $p_sponsorship->amount < $t_min_sponsorship ) {
		error_parameters( $p_sponsorship->amount, $t_min_sponsorship );
		trigger_error( ERROR_SPONSORSHIP_AMOUNT_TOO_LOW, ERROR );
	}

	# if id == 0, check if the specified user is already sponsoring the bug, if so, overwrite
	if( $p_sponsorship->id == 0 ) {
		$t_sponsorship_id = sponsorship_get_id( $p_sponsorship->bug_id, $p_sponsorship->user_id );
		if( $t_sponsorship_id !== false ) {
			$p_sponsorship->id = $t_sponsorship_id;
		}
	}

	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

	$c_id = db_prepare_int( $p_sponsorship->id );
	$c_bug_id = db_prepare_int( $p_sponsorship->bug_id );
	$c_user_id = db_prepare_int( $p_sponsorship->user_id );
	$c_amount = db_prepare_int( $p_sponsorship->amount );
	$c_logo = $p_sponsorship->logo;
	$c_url = $p_sponsorship->url;
	$c_now = db_now();

	# if new sponsorship
	if( $c_id == 0 ) {
		# Insert
		$query = "INSERT INTO $t_sponsorship_table
				    ( bug_id, user_id, amount, logo, url, date_submitted, last_updated )
				  VALUES
				    (" . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ',' . db_param() . ')';

		db_query_bound( $query, Array( $c_bug_id, $c_user_id, $c_amount, $c_logo, $c_url, $c_now, $c_now ) );
		$t_sponsorship_id = db_insert_id( $t_sponsorship_table );

		history_log_event_special( $c_bug_id, BUG_ADD_SPONSORSHIP, $c_user_id, $c_amount );
	} else {
		$t_old_amount = sponsorship_get_amount( $c_id );
		$t_sponsorship_id = $c_id;

		if( $t_old_amount == $c_amount ) {
			return $t_sponsorship_id;
		}

		# Update
		$query = "UPDATE $t_sponsorship_table
					SET	bug_id = " . db_param() . ",
						user_id = " . db_param() . ",
						amount = " . db_param() . ",
						logo = " . db_param() . ",
						url = " . db_param() . ",
						last_updated = " . db_param() . "
					WHERE	id = " . db_param();

		sponsorship_clear_cache( $c_id );

		db_query_bound( $query, Array( $c_bug_id, $c_user_id, $c_amount, $c_logo, $c_url, $c_now, $c_id ) );

		history_log_event_special( $c_bug_id, BUG_UPDATE_SPONSORSHIP, $c_user_id, $c_amount );
	}

	sponsorship_update_bug( $c_bug_id );
	bug_monitor( $c_bug_id, $c_user_id );

	if( $c_id == 0 ) {
		email_sponsorship_added( $c_bug_id );
	} else {
		email_sponsorship_updated( $c_bug_id );
	}

	return $t_sponsorship_id;
}

/**
 * delete a sponsorship given its id
 * id can be an array of ids or just an id.
 * @param int $p_sponsorship_id
 * @return null
 */
function sponsorship_delete( $p_sponsorship_id ) {
	# handle the case of array of ids
	if( is_array( $p_sponsorship_id ) ) {
		foreach( $p_sponsorship_id as $id ) {
			sponsorship_delete( $id );
		}
		return;
	}

	$c_sponsorship_id = db_prepare_int( $p_sponsorship_id );

	$t_sponsorship = sponsorship_get( $c_sponsorship_id );

	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

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

	sponsorship_clear_cache( $p_sponsorship_id );

	history_log_event_special( $t_sponsorship->bug_id, BUG_DELETE_SPONSORSHIP, $t_sponsorship->user_id, $t_sponsorship->amount );
	sponsorship_update_bug( $t_sponsorship->bug_id );

	email_sponsorship_deleted( $t_sponsorship->bug_id );
}

/**
 * updates the paid field
 * @param int $p_sponsorship_id
 * @param int $p_paid
 * @return true
 */
function sponsorship_update_paid( $p_sponsorship_id, $p_paid ) {
	$c_sponsorship_id = db_prepare_int( $p_sponsorship_id );
	$t_sponsorship = sponsorship_get( $c_sponsorship_id );

	$c_paid = db_prepare_int( $p_paid );

	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

	$query = "UPDATE $t_sponsorship_table
				  SET last_updated= " . db_param() . ", paid=" . db_param() . "
				  WHERE id=" . db_param();
	db_query_bound( $query, Array( db_now(), $c_paid, $c_sponsorship_id ) );

	history_log_event_special( $t_sponsorship->bug_id, BUG_PAID_SPONSORSHIP, $t_sponsorship->user_id, $p_paid );
	sponsorship_clear_cache( $p_sponsorship_id );

	return true;
}

/**
 * updates the last_updated field
 * @param int $p_sponsorship_id
 * @return true
 */
function sponsorship_update_date( $p_sponsorship_id ) {
	$c_sponsorship_id = db_prepare_int( $p_sponsorship_id );

	$t_sponsorship_table = db_get_table( 'mantis_sponsorship_table' );

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

	sponsorship_clear_cache( $p_sponsorship_id );

	return true;
}