<?php
# Mantis - a php based bugtracking system
# Copyright (C) 2000 - 2002  Kenzaburo Ito - kenito@300baud.org
# Copyright (C) 2002 - 2009  Mantis Team   - mantisbt-dev@lists.sourceforge.net
# Mantis 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.
#
# Mantis 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 Mantis.  If not, see <http://www.gnu.org/licenses/>.
#
# --------------------------------------------------------
# $Id$
# --------------------------------------------------------

/**
 * @package CoreAPI
 * @subpackage UserPreferencesAPI
 */

# ## User Preferences API ###
$g_default_mapping = array(
	'default_profile' => 'default_profile',
	'default_project' => 'default_project',
	'advanced_report' => 'default_advanced_report',
	'advanced_view' => 'default_advanced_view',
	'advanced_update' => 'default_advanced_update',
	'refresh_delay' => 'default_refresh_delay',
	'redirect_delay' => 'default_redirect_delay',
	'bugnote_order' => 'default_bugnote_order',
	'email_on_new' => 'default_email_on_new',
	'email_on_assigned' => 'default_email_on_assigned',
	'email_on_feedback' => 'default_email_on_feedback',
	'email_on_resolved' => 'default_email_on_resolved',
	'email_on_closed' => 'default_email_on_closed',
	'email_on_reopened' => 'default_email_on_reopened',
	'email_on_bugnote' => 'default_email_on_bugnote',
	'email_on_status' => 'default_email_on_status',
	'email_on_priority' => 'default_email_on_priority',
	'email_on_new_min_severity' => 'default_email_on_new_minimum_severity',
	'email_on_assigned_min_severity' => 'default_email_on_assigned_minimum_severity',
	'email_on_feedback_min_severity' => 'default_email_on_feedback_minimum_severity',
	'email_on_resolved_min_severity' => 'default_email_on_resolved_minimum_severity',
	'email_on_closed_min_severity' => 'default_email_on_closed_minimum_severity',
	'email_on_reopened_min_severity' => 'default_email_on_reopened_minimum_severity',
	'email_on_bugnote_min_severity' => 'default_email_on_bugnote_minimum_severity',
	'email_on_status_min_severity' => 'default_email_on_status_minimum_severity',
	'email_on_priority_min_severity' => 'default_email_on_priority_minimum_severity',
	'email_bugnote_limit' => 'default_email_bugnote_limit',
	'language' => 'default_language',
);

# ===================================
# Preference Structure Definition
# ===================================
class UserPreferences {
	var $default_profile = NULL;
	var $default_project = NULL;
	var $advanced_report = NULL;
	var $advanced_view = NULL;
	var $advanced_update = NULL;
	var $refresh_delay = NULL;
	var $redirect_delay = NULL;
	var $bugnote_order = NULL;
	var $email_on_new = NULL;
	var $email_on_assigned = NULL;
	var $email_on_feedback = NULL;
	var $email_on_resolved = NULL;
	var $email_on_closed = NULL;
	var $email_on_reopened = NULL;
	var $email_on_bugnote = NULL;
	var $email_on_status = NULL;
	var $email_on_priority = NULL;
	var $email_on_new_min_severity = NULL;
	var $email_on_assigned_min_severity = NULL;
	var $email_on_feedback_min_severity = NULL;
	var $email_on_resolved_min_severity = NULL;
	var $email_on_closed_min_severity = NULL;
	var $email_on_reopened_min_severity = NULL;
	var $email_on_bugnote_min_severity = NULL;
	var $email_on_status_min_severity = NULL;
	var $email_on_priority_min_severity = NULL;
	var $email_bugnote_limit = NULL;
	var $language = NULL;

	function UserPreferences() {
		$this->default_profile = 0;
		$this->default_project = ALL_PROJECTS;
	}

	function Get( $t_string ) {
		global $g_default_mapping;
		if( is_null( $this->{$t_string} ) ) {
			$this->{$t_string} = config_get( $g_default_mapping[$t_string] );
		}
		return $this->{$t_string};
	}
}

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

$g_cache_user_pref = array();

# --------------------
# Cache a user preferences row if necessary and return the cached copy
#  If the third parameter is true (default), trigger an error
#  if the preferences can't be found.  If the second parameter is
#  false, return false if the preferences can't be found.
function user_pref_cache_row( $p_user_id, $p_project_id = ALL_PROJECTS, $p_trigger_errors = true ) {
	global $g_cache_user_pref;

	if( isset( $g_cache_user_pref[$p_user_id][$p_project_id] ) ) {
		return $g_cache_user_pref[$p_user_id][$p_project_id];
	}

	$t_user_pref_table = db_get_table( 'mantis_user_pref_table' );

	$query = "SELECT *
				  FROM $t_user_pref_table
				  WHERE user_id=" . db_param() . " AND project_id=" . db_param();
	$result = db_query_bound( $query, Array( $p_user_id, $p_project_id ) );

	if( 0 == db_num_rows( $result ) ) {
		if( $p_trigger_errors ) {
			trigger_error( ERROR_USER_PREFS_NOT_FOUND, ERROR );
		} else {
			$g_cache_user_pref[$p_user_id][$p_project_id] = false;
			return false;
		}
	}

	$row = db_fetch_array( $result );

	if( !isset( $g_cache_user_pref[$p_user_id] ) ) {
		$g_cache_user_pref[$p_user_id] = array();
	}

	$g_cache_user_pref[$p_user_id][$p_project_id] = $row;

	return $row;
}

# --------------------
# Clear the user preferences cache (or just the given id if specified)
function user_pref_clear_cache( $p_user_id = null, $p_project_id = null ) {
	global $g_cache_user_pref;

	$c_user_id = db_prepare_int( $p_user_id );
	$c_project_id = db_prepare_int( $p_project_id );

	if( null === $p_user_id ) {
		$g_cache_user_pref = array();
	} elseif( null === $p_project_id ) {
		unset( $g_cache_user_pref[$c_user_id] );
	} else {
		unset( $g_cache_user_pref[$c_user_id][$c_project_id] );
	}

	return true;
}

# ===================================
# Boolean queries and ensures
# ===================================
# --------------------
# return true if the user has prefs assigned for the given project,
#  false otherwise
#
# Trying to get the row shouldn't be any slower in the DB than getting COUNT(*)
#  and the transfer time is negligable.  So we try to cache the row - it could save
#  us another query later.
function user_pref_exists( $p_user_id, $p_project_id = ALL_PROJECTS ) {
	if( false === user_pref_cache_row( $p_user_id, $p_project_id, false ) ) {
		return false;
	} else {
		return true;
	}
}

# ===================================
# Creation / Deletion / Updating
# ===================================
# --------------------
# perform an insert of a preference object into the DB
#
# Also see the higher level user_pref_set() and user_pref_set_default()
function user_pref_insert( $p_user_id, $p_project_id, $p_prefs ) {
	$c_user_id = db_prepare_int( $p_user_id );
	$c_project_id = db_prepare_int( $p_project_id );

	user_ensure_unprotected( $p_user_id );

	$t_user_pref_table = db_get_table( 'mantis_user_pref_table' );

	$t_vars = get_object_vars( $p_prefs );
	$t_values = array();

	$t_params[] = db_param(); // user_id
	$t_values[] = $c_user_id;
	$t_params[] = db_param(); // project_id
	$t_values[] = $c_project_id;
	foreach( $t_vars as $var => $val ) {
		array_push( $t_params, db_param());
		array_push( $t_values, $p_prefs->Get( $var ) );
	}

	$t_vars_string = implode( ', ', array_keys( $t_vars ) );
	$t_params_string = implode( ',', $t_params );
	
	$query = "INSERT INTO $t_user_pref_table
				    (user_id, project_id, $t_vars_string)
				  VALUES ( " . $t_params_string . ")";
	db_query_bound( $query, $t_values  );

	# db_query errors on failure so:
	return true;
}

# --------------------
# perform an update of a preference object into the DB
#
# Also see the higher level user_pref_set() and user_pref_set_default()
function user_pref_update( $p_user_id, $p_project_id, $p_prefs ) {
	$c_user_id = db_prepare_int( $p_user_id );
	$c_project_id = db_prepare_int( $p_project_id );

	user_ensure_unprotected( $p_user_id );

	$t_user_pref_table = db_get_table( 'mantis_user_pref_table' );
	$t_vars = get_object_vars( $p_prefs );

	$t_pairs = array();
	$t_values = array();
	
	foreach( $t_vars as $var => $val ) {
		array_push( $t_pairs, "$var = " . db_param() ) ;
		array_push( $t_values, $val );		
	}

	$t_pairs_string = implode( ', ', $t_pairs );
	$t_values[] = $c_user_id;
	$t_values[] = $c_project_id;
	
	$query = "UPDATE $t_user_pref_table
				  SET $t_pairs_string
				  WHERE user_id=" . db_param() . " AND project_id=" . db_param();
	db_query_bound( $query, $t_values );

	user_pref_clear_cache( $p_user_id, $p_project_id );

	# db_query errors on failure so:
	return true;
}

# --------------------
# delete a preferencess row
# returns true if the prefs were successfully deleted
function user_pref_delete( $p_user_id, $p_project_id = ALL_PROJECTS ) {
	$c_user_id = db_prepare_int( $p_user_id );
	$c_project_id = db_prepare_int( $p_project_id );

	user_ensure_unprotected( $p_user_id );

	$t_user_pref_table = db_get_table( 'mantis_user_pref_table' );

	$query = "DELETE FROM $t_user_pref_table
				  WHERE user_id=" . db_param() . " AND
				  		project_id=" . db_param();
	db_query_bound( $query, Array( $c_user_id, $c_project_id ) );

	user_pref_clear_cache( $p_user_id, $p_project_id );

	# db_query errors on failure so:
	return true;
}

# --------------------
# delete all preferences for a user in all projects
# returns true if the prefs were successfully deleted
#
# It is far more efficient to delete them all in one query than to
#  call user_pref_delete() for each one and the code is short so that's
#  what we do
function user_pref_delete_all( $p_user_id ) {
	$c_user_id = db_prepare_int( $p_user_id );

	user_ensure_unprotected( $p_user_id );

	$t_user_pref_table = db_get_table( 'mantis_user_pref_table' );

	$query = "DELETE FROM $t_user_pref_table
				  WHERE user_id='$c_user_id'";
	db_query( $query );

	user_pref_clear_cache( $p_user_id );

	# db_query errors on failure so:
	return true;
}

# --------------------
# delete all preferences for a project for all users (part of deleting the project)
# returns true if the prefs were successfully deleted
#
# It is far more efficient to delete them all in one query than to
#  call user_pref_delete() for each one and the code is short so that's
#  what we do
function user_pref_delete_project( $p_project_id ) {
	$c_project_id = db_prepare_int( $p_project_id );

	$t_user_pref_table = db_get_table( 'mantis_user_pref_table' );

	$query = "DELETE FROM $t_user_pref_table
				  WHERE project_id=" . db_param();
	db_query_bound( $query, Array( $c_project_id ) );

	# db_query errors on failure so:
	return true;
}

# ===================================
# Data Access
# ===================================
# --------------------
# return the user's preferences
# @@@ (this should be a private interface as it doesn't have the benefit of applying
#  global defaults before returning values.
function user_pref_get_row( $p_user_id, $p_project_id = ALL_PROJECTS ) {
	return user_pref_cache_row( $p_user_id, $p_project_id );
}

# --------------------
# return the user's preferences in a UserPreferences object
function user_pref_get( $p_user_id, $p_project_id = ALL_PROJECTS ) {
	global $g_default_mapping;

	$t_prefs = new UserPreferences;

	$row = user_pref_cache_row( $p_user_id, $p_project_id, false );

	# If the user has no preferences for the given project
	if( false === $row ) {
		if( ALL_PROJECTS != $p_project_id ) {

			# Try to get the prefs for ALL_PROJECTS (the defaults)
			$row = user_pref_cache_row( $p_user_id, ALL_PROJECTS, false );
		}

		# If $row is still false (the user doesn't have default preferences)
		if( false === $row ) {

			# We use an empty array
			$row = array();
		}
	}

	$t_row_keys = array_keys( $row );
	$t_vars = get_object_vars( $t_prefs );

	# 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
			$t_prefs->$var = $row[$var];
		} else {
			$t_prefs->$var = $t_prefs->Get( $var );
		}
	}
	return $t_prefs;
}

# --------------------
# Return the specified preference field for the user id
# If the preference can't be found try to return a defined default
# If that fails, trigger a WARNING and return ''
function user_pref_get_pref( $p_user_id, $p_pref_name, $p_project_id = ALL_PROJECTS ) {
	$t_prefs = user_pref_get( $p_user_id, $p_project_id );

	$t_vars = get_object_vars( $t_prefs );

	if( in_array( $p_pref_name, array_keys( $t_vars ), true ) ) {
		return $t_prefs->Get( $p_pref_name );
	} else {
		error_parameters( $p_pref_name );
		trigger_error( ERROR_DB_FIELD_NOT_FOUND, WARNING );
		return '';
	}
}

# --------------------
# returns user language
function user_pref_get_language( $p_user_id, $p_project_id = ALL_PROJECTS ) {
	$t_prefs = user_pref_get( $p_user_id, $p_project_id );

	// ensure the language is a valid one
	$t_lang = $t_prefs->language;
	if( !lang_language_exists( $t_lang ) ) {
		$t_lang = false;
	}
	return $t_lang;
}

# ===================================
# Data Modification
# ===================================
# --------------------
# Set a user preference
#
# By getting the prefs for the project first we deal fairly well with defaults.
#  If there are currently no prefs for that project, the ALL_PROJECTS prefs will
#  be returned so we end up storing a new set of prefs for the given project
#  based on the prefs for ALL_PROJECTS.  If there isn't even an entry for
#  ALL_PROJECTS, we'd get returned a default UserPreferences object to modify.
function user_pref_set_pref( $p_user_id, $p_pref_name, $p_pref_value, $p_project_id = ALL_PROJECTS ) {
	$t_prefs = user_pref_get( $p_user_id, $p_project_id );

	$t_prefs->$p_pref_name = $p_pref_value;

	user_pref_set( $p_user_id, $t_prefs, $p_project_id );

	return true;
}

# set the user's preferences for the project from the given preferences object
#  Do the work by calling user_pref_update() or user_pref_insert() as appropriate
function user_pref_set( $p_user_id, $p_prefs, $p_project_id = ALL_PROJECTS ) {
	if( user_pref_exists( $p_user_id, $p_project_id ) ) {
		return user_pref_update( $p_user_id, $p_project_id, $p_prefs );
	} else {
		return user_pref_insert( $p_user_id, $p_project_id, $p_prefs );
	}
}

# create a set of default preferences for the project
function user_pref_set_default( $p_user_id, $p_project_id = ALL_PROJECTS ) {

	# get a default preferences object
	$t_prefs = new UserPreferences();

	return user_pref_set( $p_user_id, $t_prefs, $p_project_id );
}