<?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/>.

require_api( 'authentication_api.php' );
require_api( 'bug_api.php' );
require_api( 'constant_inc.php' );
require_api( 'config_api.php' );
require_api( 'helper_api.php' );
require_api( 'user_api.php' );

use Mantis\Exceptions\ClientException;

/**
 * Command data
 * - In files, `error` and `size` are used only by web UI.
 * - Reporter is optional, it is defaulted to logged in user.
 * - View State defaults to default bugnote view status.
 * - Time tracking is optional and defaults to 0.
 *
 * Sample:
 * {
 *   "query": {
 *     "issue_id": 12345
 *   },
 *   "payload": {
 *     "text": "This is a test issue note",
 *     "view_state": {
 *       "name": "private"
 *     },
 *     "reporter": {
 *       "name": "vboctor"
 *     },
 *     "time_tracking": {
 *       "duration": "00:45",
 *     },
 *     "files": [
 *       {
 *         "name": "filename.ext",
 *         "type": "application/...",
 *         "tmp_name": "/tmp/php/phpRELws8",
 *         "error": 0,
 *         "size": 114
 *       }
 *     ]
 *   },
 *   "options": {
 *     "skip_moderation": false
 *   }
 * }
 */

/**
 * A command that adds an issue note.
 */
class IssueNoteAddCommand extends Command {
	/**
	 * The issue to add the note to.
	 *
	 * @var BugData
	 */
	private $issue = null;

	/**
	 * @var integer
	 */
	private $user_id;

	/**
	 * Time tracking duration associated with the note.
	 *
	 * @var string
	 */
	private $time_tracking = '0:00';

	/**
	 * The files to attach with the note.
	 */
	private $files = array();

	/**
	 * Private note?
	 *
	 * @var boolean
	 */
	private $private = false;

	/**
	 * The note text to add.
	 */
	private $text = '';

	/**
	 * The reporter id for the note.
	 */
	private $reporterId = 0;

	/**
	 * Constructor
	 *
	 * @param array $p_data The command data.
	 */
	function __construct( array $p_data ) {
		parent::__construct( $p_data );
	}

	/**
	 * Validate the data.
	 */
	function validate() {
		# Validate issue note type
		$t_type = $this->payload( 'type', 'note' );
		switch( $t_type ) {
			case 'note':
			case 'timelog':
				# nothing to do here, the command will always set the
				# type to `note` and core API will set to `timelog`
				# when appropriate.
				break;
			case 'reminder':  # isn't supported by this command.
			default:
				throw new ClientException(
					sprintf( "Invalid value '%s' for 'type'.", $t_type ),
					ERROR_INVALID_FIELD_VALUE,
					array( 'type' )
				);
		}

		$t_issue_id = helper_parse_issue_id( $this->query( 'issue_id' ) );

		$this->issue = bug_get( $t_issue_id, true );
		if( bug_is_readonly( $t_issue_id ) ) {
			throw new ClientException(
				sprintf( "Issue '%d' is read-only.", $t_issue_id ),
				ERROR_BUG_READ_ONLY_ACTION_DENIED,
				array( $t_issue_id ) );
		}

		$this->parseViewState();
		$this->parseFiles();

		$t_files_included = !empty( $this->files );

		$t_time_tracking = $this->payload( 'time_tracking' );
		if( is_array( $t_time_tracking ) && isset( $t_time_tracking['duration'] ) ) {
			$this->time_tracking = $t_time_tracking['duration'];
		}

		# Parse to duration to validate it.
		$t_time_tracking_mins = helper_duration_to_minutes( $this->time_tracking, 'time tracking duration' );

		$this->text = trim( $this->payload( 'text', '' ) );
		if( empty( $this->text ) &&
		    $t_time_tracking_mins == 0 && 
		    count( $this->files ) == 0 ) {
			throw new ClientException( 'Issue note not specified.', ERROR_EMPTY_FIELD, array( lang_get( 'bugnote' ) ) );
		}

		$this->user_id = auth_get_current_user_id();

		# Parse reporter id or default it.
		$t_reporter = $this->payload( 'reporter' );
		if( $t_reporter !== null ) {
			$this->reporterId = user_get_id_by_user_info(
				$t_reporter, /* throw_if_id_doesnt_exist */ true );
		} else {
			$this->reporterId = $this->user_id;
		}

		if( $this->reporterId != $this->user_id ) {
			# Make sure that active user has access level required to specify a different reporter.
			# This feature is only available in the API and not Web UI.
			$t_specify_reporter_access_level = config_get( 'webservice_specify_reporter_on_add_access_level_threshold' );
			if( !access_has_bug_level( $t_specify_reporter_access_level, $t_issue_id ) ) {
				throw new ClientException( 'Access denied to override reporter', ERROR_ACCESS_DENIED );
			}
		}

		# Can reporter add notes?
		if( !access_has_bug_level( config_get( 'add_bugnote_threshold' ), $t_issue_id, $this->reporterId ) ) {
			throw new ClientException( "Reporter can't add notes", ERROR_ACCESS_DENIED );
		}

		# Can reporter add private notes?
		if( $this->private ) {
			if( !access_has_bug_level( config_get( 'set_view_status_threshold' ), $t_issue_id, $this->reporterId ) ) {
				throw new ClientException( "Reporter can't add private notes", ERROR_ACCESS_DENIED );
			}
		}

		# Can reporter attach files, if supplied?
		if( $t_files_included ) {
			if( !file_allow_bug_upload( $this->issue->id, $this->reporterId ) ) {
				throw new ClientException( 'access denied for uploading files', ERROR_ACCESS_DENIED );
			}

			if( !$this->option( 'skip_moderation', false ) ) {
				# Check if note will be moderated - files not allowed if so
				$t_will_moderate = event_signal( 'EVENT_BUGNOTE_ADD_MODERATE_CHECK', array( $t_issue_id ) );
				if( $t_will_moderate ) {
					throw new ClientException(
						'Files cannot be attached to notes that require moderation.',
						ERROR_ACCESS_DENIED );
				}
			}
		}

		# Can reporter add time tracking information?
		if( $t_time_tracking_mins > 0 ) {
			if( config_get( 'time_tracking_enabled' ) == OFF ) {
				throw new ClientException( 'time tracking disabled', ERROR_ACCESS_DENIED );
			}

			if ( !access_has_bug_level( config_get( 'time_tracking_edit_threshold' ), $t_issue_id, $this->reporterId ) ) {
				throw new ClientException( 'access denied for time tracking', ERROR_ACCESS_DENIED );
			}
		}
	}

	/**
	 * Process the command.
	 *
	 * @return array Command response
	 */
	protected function process() {
		if( $this->issue->project_id != helper_get_current_project() ) {
			# in case the current project is not the same project of the bug we are
			# viewing, override the current project. This to avoid problems with
			# categories and handlers lists etc.
			global $g_project_override;
			$g_project_override = $this->issue->project_id;
		}

		# Allow plugins to intercept for moderation
		# If any plugin returns true, it has queued the note for moderation
		if( !$this->option( 'skip_moderation', false ) ) {
			$t_note_data = $this->data['payload'];
			$t_moderated = event_signal( 'EVENT_BUGNOTE_ADD_MODERATE', array( $this->issue->id, $t_note_data ) );
			if( $t_moderated ) {
				# Plugin handled the note, return special response
				return array( 'moderated' => true );
			}
		}

		# We always set the note type to BUGNOTE, and the API will overwrite it with TIME_TRACKING
		# if time tracking is not 0 and the time tracking feature is enabled.
		$t_note_id = bugnote_add(
			$this->issue->id,
			$this->text,
			$this->time_tracking,
			$this->private,
			BUGNOTE,
			/* attr */ '',
			/* user_id */ $this->reporterId,
			/* send_email */ false,
			/* date_submitted */ 0,
			/* last_modified */ 0,
			/* skip_bug_update */ false,
			/* log_history */ true,
			/* trigger_event */ false );

		if( !$t_note_id ) {
			throw new ClientException( "Unable to add note", ERROR_GENERIC );
		}

		# Handle the file upload
		$t_file_infos = file_attach_files( $this->issue->id, $this->files, $t_note_id );

		# Process the mentions in the added note
		$t_user_ids_that_got_mention_notifications = bugnote_process_mentions( $this->issue->id, $t_note_id, $this->payload( 'text' ) );

		# Handle the reassign on feedback feature. Note that this feature generally
		# won't work very well with custom workflows as it makes a lot of assumptions
		# that may not be true. It assumes you don't have any statuses in the workflow
		# between 'bug_submit_status' and 'bug_feedback_status'. It assumes you only
		# have one feedback, assigned and submitted status.
		if( config_get( 'reassign_on_feedback' ) &&
			$this->issue->status === config_get( 'bug_feedback_status' ) &&
			$this->issue->handler_id !== $this->reporterId &&
			$this->issue->reporter_id === $this->reporterId ) {
			if( $this->issue->handler_id !== NO_USER ) {
				bug_set_field( $this->issue->id, 'status', config_get( 'bug_assigned_status' ) );
			} else {
				bug_set_field( $this->issue->id, 'status', config_get( 'bug_submit_status' ) );
			}
		}

		# Send email explicitly from here to have file support, this will move into the API once we have
		# proper bugnote files support in db schema and object model.
		email_bugnote_add( $t_note_id, $t_file_infos, /* user_exclude_ids */ $t_user_ids_that_got_mention_notifications );

		# Event integration
		event_signal( 'EVENT_BUGNOTE_ADD', array( $this->issue->id, $t_note_id, $t_file_infos ) );

		return array( 'id' => $t_note_id );
	}

	/**
	 * Parse view state for note.
	 * @return void
	 */
	private function parseViewState() {
		$t_view_state = $this->payload( 'view_state' );
		if( $t_view_state === null ) {
			$t_view_state = config_get( 'default_bugnote_view_status' );
		} else {
			$t_view_state = helper_parse_view_state( $t_view_state );
		}

		$this->private = $t_view_state == VS_PRIVATE;
	}

	/**
	 * Parse files from payload.
	 * @return void
	 */
	private function parseFiles() {
		$this->files = $this->payload( 'files', array() );
		if( !is_array( $this->files ) ) {
			$this->files = array();
		}

		$t_files_required_fields = array( 'name', 'tmp_name' );
		foreach( $this->files as $t_file ) {
			foreach( $t_files_required_fields as $t_field ) {
				if( !isset( $t_file[$t_field] ) ) {
					throw new ClientException(
						sprintf( "File field '%s' is missing.", $t_field ),
						ERROR_EMPTY_FIELD,
						array( $t_field ) );
				}
			}
		}
	}
}

