<?php

if ( ! class_exists( 'GFForms' ) ) {
	die();
}

/**
 * Handles all tasks related to locking.
 *
 * - Loads the WordPress Heartbeat API and scripts & styles for GF Locking
 * - Provides standardized UX
 *
 * @package GFLocking
 * @author  Rocketgenius
 */
abstract class GFLocking {
	private $_object_type;
	private $_object_id;
	private $_edit_url;
	private $_redirect_url;
	private $_capabilities;
	const PREFIX_EDIT_LOCK         = 'lock_';
	const PREFIX_EDIT_LOCK_REQUEST = 'lock_request_';


	public function __construct( $object_type, $redirect_url, $edit_url = '', $capabilities = array() ) {
		$this->_object_type  = $object_type;
		$this->_redirect_url = $redirect_url;
		$this->_capabilities = $capabilities;
		if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
			$this->init_ajax();
		} else {
			$this->register_scripts();
			$is_locking_page = false;
			$is_edit_page    = false;
			if ( $this->is_edit_page() ) {
				$this->init_edit_lock();
				$is_locking_page = true;
				$is_edit_page    = true;
			} else if ( $this->is_list_page() ) {
				$this->init_list_page();
				$is_locking_page = true;
			} else if ( $this->is_view_page() ) {
				$this->init_view_page();
				$is_locking_page = true;
			}
			if ( $is_locking_page ) {
				$this->_object_id = $this->get_object_id();
				$this->_edit_url  = $edit_url;
				$this->maybe_lock_object( $is_edit_page );
			}
		}
	}

	/**
	 * Override this method to check the condition for the edit page.
	 *
	 * @return bool
	 */
	protected function is_edit_page() {
		return false;
	}

	/**
	 * Override this method to check the condition for the list page.
	 *
	 * @return bool
	 */
	protected function is_list_page() {
		return false;
	}

	/**
	 * Override this method to check the condition for the view page.
	 *
	 * @return bool
	 */
	protected function is_view_page() {
		return false;
	}

	/**
	 * Override this method to provide the class with the correct object id.
	 *
	 * @return bool
	 */
	protected function get_object_id() {
		$id = rgget( 'id' );
		$id = absint( $id );
		return $id; // example in the case of form id
	}

	public function init_edit_lock() {
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
	}

	public function init_ajax() {
		add_filter( 'heartbeat_received', array( $this, 'heartbeat_refresh_nonces' ), 10, 3 );
		add_filter( 'heartbeat_received', array( $this, 'heartbeat_check_locked_objects' ), 10, 3 );
		add_filter( 'heartbeat_received', array( $this, 'heartbeat_refresh_lock' ), 10, 3 );
		add_filter( 'heartbeat_received', array( $this, 'heartbeat_request_lock' ), 10, 3 );
		add_filter( 'wp_ajax_gf_lock_request_' . $this->_object_type, array( $this, 'ajax_lock_request' ) );
		add_filter( 'wp_ajax_gf_reject_lock_request_' . $this->_object_type, array( $this, 'ajax_reject_lock_request' ) );
	}

	public function init_list_page() {
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_list_scripts' ) );
	}

	public function init_view_page() {
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_view_page_scripts' ) );
	}

	public function register_scripts() {
		$min = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG || isset( $_GET['gform_debug'] ) ? '' : '.min';
		$locking_path = GFCommon::get_base_url() . '/includes/locking/';
		wp_register_script( 'gforms_locking', $locking_path . "js/locking{$min}.js", array( 'jquery', 'heartbeat' ), GFCommon::$version );
		wp_register_script( 'gforms_locking_view', $locking_path . "js/locking-view{$min}.js", array( 'jquery', 'heartbeat' ), GFCommon::$version );
		wp_register_script( 'gforms_locking_list', $locking_path . "js/locking-list{$min}.js", array( 'jquery', 'heartbeat' ), GFCommon::$version );
		wp_register_style( 'gforms_locking_css', $locking_path . "css/locking{$min}.css", array(), GFCommon::$version );
		wp_register_style( 'gforms_locking_list_css', $locking_path . "css/locking-list{$min}.css", array(), GFCommon::$version );

		// No conflict scripts
		add_filter( 'gform_noconflict_scripts', array( $this, 'register_noconflict_scripts' ) );
		add_filter( 'gform_noconflict_styles', array( $this, 'register_noconflict_styles' ) );
	}

	public function register_noconflict_scripts( $scripts ) {
		$locking_scripts = array( 'gforms_locking', 'gforms_locking_list', 'gforms_locking_view' );

		return array_merge( $scripts, $locking_scripts );
	}

	public function register_noconflict_styles( $styles ) {
		$locking_styles = array( 'gforms_locking_css', 'gforms_locking_list_css' );

		return array_merge( $styles, $locking_styles );
	}

	public function enqueue_scripts() {


		wp_enqueue_script( 'gforms_locking' );
		wp_enqueue_style( 'gforms_locking_css' );
		$lock_user_id = $this->check_lock( $this->get_object_id() );

		$strings = array(
			'noResponse'    => $this->get_string( 'no_response' ),
			'requestAgain'  => $this->get_string( 'request_again' ),
			'requestError'  => $this->get_string( 'request_error' ),
			'gainedControl' => $this->get_string( 'gained_control' ),
			'rejected'      => $this->get_string( 'request_rejected' ),
			'pending'       => $this->get_string( 'request_pending' )
		);


		$vars = array(
			'hasLock'    => ! $lock_user_id ? 1 : 0,
			'lockUI'     => $this->get_lock_ui( $lock_user_id ),
			'objectID'   => $this->_object_id,
			'objectType' => $this->_object_type,
			'strings'    => $strings,
		);

		wp_localize_script( 'gforms_locking', 'gflockingVars', $vars );
	}

	public function enqueue_list_scripts() {

		wp_enqueue_script( 'gforms_locking_list' );
		wp_enqueue_style( 'gforms_locking_list_css' );

		$vars = array(
			'objectType' => $this->_object_type,
		);

		wp_localize_script( 'gforms_locking_list', 'gflockingVars', $vars );

	}

	public function enqueue_view_page_scripts() {

		wp_enqueue_script( 'gforms_locking_view' );
		wp_enqueue_style( 'gforms_locking_view_css' );

		$lock_user_id = $this->check_lock( $this->get_object_id() );
		$vars         = array(
			'hasLock'    => ! $lock_user_id ? 1 : 0,
			'objectID'   => $this->_object_id,
			'objectType' => $this->_object_type,
		);

		wp_localize_script( 'gforms_locking_view', 'gflockingVars', $vars );
	}


	protected function get_strings() {
		$strings = array(
			'currently_locked'  => esc_html__( 'This page is currently locked. Click on the "Request Control" button to let %s know you\'d like to take over.', 'gravityforms' ),
			'accept'            => esc_html__( 'Accept', 'gravityforms' ),
			'cancel'            => esc_html__( 'Cancel', 'gravityforms' ),
			'currently_editing' => esc_html__( '%s is currently editing', 'gravityforms' ),
			'taken_over'        => esc_html__( '%s has taken over and is currently editing.', 'gravityforms' ),
			'lock_requested'    => esc_html__( '%s has requested permission to take over control.', 'gravityforms' ),
			'gained_control'    => esc_html__( 'You now have control', 'gravityforms' ),
			'request_pending'   => esc_html__( 'Pending', 'gravityforms' ),
			'no_response'       => esc_html__( 'No response', 'gravityforms' ),
			'request_again'     => esc_html__( 'Request again', 'gravityforms' ),
			'request_error'     => esc_html__( 'Error', 'gravityforms' ),
			'request_rejected'  => esc_html__( 'Your request was rejected', 'gravityforms' ),
		);

		return $strings;
	}

	public function ajax_lock_request() {
		$object_id = rgget( 'object_id' );
		$response  = $this->request_lock( $object_id );
		echo json_encode( $response );
		die();
	}

	public function ajax_reject_lock_request() {
		$object_id = rgget( 'object_id' );
		$response  = $this->delete_lock_request_meta( $object_id );
		echo json_encode( $response );
		die();
	}

	protected function has_lock() {
		return $this->check_lock( $this->get_object_id() ) ? true : false;
	}


	protected function check_lock( $object_id ) {

		if ( ! $user_id = $this->get_lock_meta( $object_id ) ) {
			return false;
		}

		if ( $user_id != get_current_user_id() ) {
			return $user_id;
		}

		return false;
	}

	protected function check_lock_request( $object_id ) {

		if ( ! $user_id = $this->get_lock_request_meta( $object_id ) ) {
			return false;
		}

		if ( $user_id != get_current_user_id() ) {
			return $user_id;
		}

		return false;
	}

	protected function set_lock( $object_id ) {
		if ( ! GFCommon::current_user_can_any( $this->_capabilities ) ) {
			return false;
		}

		if ( 0 == ( $user_id = get_current_user_id() ) ) {
			return false;
		}

		$this->update_lock_meta( $object_id, $user_id );

		return $user_id;
	}

	protected function request_lock( $object_id ) {
		if ( 0 == ( $user_id = get_current_user_id() ) ) {
			return false;
		}

		$lock_holder_user_id = $this->check_lock( $object_id );

		$result = array();
		if ( ! $lock_holder_user_id ) {
			$this->set_lock( $object_id );
			$result['html']   = __( 'You now have control', 'gravityforms' );
			$result['status'] = 'lock_obtained';
		} else {
			$user = get_userdata( $lock_holder_user_id );
			$this->update_lock_request_meta( $object_id, $user_id );
			$result['html']   = sprintf( __( 'Your request has been sent to %s.', 'gravityforms' ), $user->display_name );
			$result['status'] = 'lock_requested';
		}

		return $result;
	}

	protected function get_lock_request_meta( $object_id ) {
		return GFCache::get( self::PREFIX_EDIT_LOCK_REQUEST . $this->_object_type . '_' . $object_id );
	}

	protected function get_lock_meta( $object_id ) {
		return GFCache::get( self::PREFIX_EDIT_LOCK . $this->_object_type . '_' . $object_id );
	}

	protected function update_lock_meta( $object_id, $lock_value ) {
		GFCache::set( self::PREFIX_EDIT_LOCK . $this->_object_type . '_' . $object_id, $lock_value, true, 150 );
	}

	protected function update_lock_request_meta( $object_id, $lock_request_value ) {
		GFCache::set( self::PREFIX_EDIT_LOCK_REQUEST . $this->_object_type . '_' . $object_id, $lock_request_value, true, 120 );
	}

	protected function delete_lock_request_meta( $object_id ) {
		GFCache::delete( self::PREFIX_EDIT_LOCK_REQUEST . $this->_object_type . '_' . $object_id );

		return true;
	}

	protected function delete_lock_meta( $object_id ) {
		GFCache::delete( self::PREFIX_EDIT_LOCK . $this->_object_type . '_' . $object_id );

		return true;
	}

	public function maybe_lock_object( $is_edit_page ) {
		if ( isset( $_GET['get-edit-lock'] ) ) {
			$this->set_lock( $this->_object_id );
			wp_safe_redirect( $this->_edit_url );
			exit();
		} else if ( isset( $_GET['release-edit-lock'] ) ) {
			$this->delete_lock_meta( $this->_object_id );
			wp_safe_redirect( $this->_redirect_url );
			exit();
		} else {
			if ( $is_edit_page && ! $user_id = $this->check_lock( $this->_object_id ) ) {
				$this->set_lock( $this->_object_id );
			}
		}
	}


	public function heartbeat_check_locked_objects( $response, $data, $screen_id ) {
		$checked       = array();
		$heartbeat_key = 'gform-check-locked-objects-' . $this->_object_type;
		if ( array_key_exists( $heartbeat_key, $data ) && is_array( $data[ $heartbeat_key ] ) ) {
			foreach ( $data[ $heartbeat_key ] as $object_id ) {
				if ( ( $user_id = $this->check_lock( $object_id ) ) && ( $user = get_userdata( $user_id ) ) ) {
					$send = array( 'text' => sprintf( __( $this->get_string( 'currently_editing' ) ), $user->display_name ) );

					if ( ( $avatar = get_avatar( $user->ID, 18 ) ) && preg_match( "|src='([^']+)'|", $avatar, $matches ) ) {
						$send['avatar_src'] = $matches[1];
					}

					$checked[ $object_id ] = $send;
				}
			}
		}

		if ( ! empty( $checked ) ) {
			$response[ $heartbeat_key ] = $checked;
		}

		return $response;
	}

	public function heartbeat_refresh_lock( $response, $data, $screen_id ) {
		$heartbeat_key = 'gform-refresh-lock-' . $this->_object_type;
		if ( array_key_exists( $heartbeat_key, $data ) ) {
			$received = $data[ $heartbeat_key ];
			$send     = array();

			if ( ! isset( $received['objectID'] ) ) {
				return $response;
			}

			$object_id = $received['objectID'];

			if ( ( $user_id = $this->check_lock( $object_id ) ) && ( $user = get_userdata( $user_id ) ) ) {
				$error = array(
					'text' => sprintf( __( $this->get_string( 'taken_over' ) ), $user->display_name )
				);

				if ( $avatar = get_avatar( $user->ID, 64 ) ) {
					if ( preg_match( "|src='([^']+)'|", $avatar, $matches ) ) {
						$error['avatar_src'] = $matches[1];
					}
				}

				$send['lock_error'] = $error;
			} else {
				if ( $new_lock = $this->set_lock( $object_id ) ) {
					$send['new_lock'] = $new_lock;

					if ( ( $lock_requester = $this->check_lock_request( $object_id ) ) && ( $user = get_userdata( $lock_requester ) ) ) {
						$lock_request = array(
							'text' => sprintf( __( $this->get_string( 'lock_requested' ) ), $user->display_name )
						);

						if ( $avatar = get_avatar( $user->ID, 64 ) ) {
							if ( preg_match( "|src='([^']+)'|", $avatar, $matches ) ) {
								$lock_request['avatar_src'] = $matches[1];
							}
						}
						$send['lock_request'] = $lock_request;
					}
				}
			}

			$response[ $heartbeat_key ] = $send;
		}

		return $response;
	}

	public function heartbeat_request_lock( $response, $data, $screen_id ) {
		$heartbeat_key = 'gform-request-lock-' . $this->_object_type;
		if ( array_key_exists( $heartbeat_key, $data ) ) {
			$received = $data[ $heartbeat_key ];
			$send     = array();

			if ( ! isset( $received['objectID'] ) ) {
				return $response;
			}

			$object_id = $received['objectID'];

			if ( ( $user_id = $this->check_lock( $object_id ) ) && ( $user = get_userdata( $user_id ) ) ) {
				if ( $this->get_lock_request_meta( $object_id ) ) {
					$send['status'] = 'pending';
				} else {
					$send['status'] = 'deleted';
				}
			} else {
				if ( $new_lock = $this->set_lock( $object_id ) ) {
					$send['status'] = 'granted';
				}
			}

			$response[ $heartbeat_key ] = $send;
		}

		return $response;
	}


	public function heartbeat_refresh_nonces( $response, $data, $screen_id ) {
		if ( array_key_exists( 'gform-refresh-nonces', $data ) ) {
			$received                         = $data['gform-refresh-nonces'];
			$response['gform-refresh-nonces'] = array( 'check' => 1 );

			if ( ! isset( $received['objectID'] ) ) {
				return $response;
			}

			$object_id = $received['objectID'];

			if ( ! GFCommon::current_user_can_any( $this->_capabilities ) || empty( $received['post_nonce'] ) ) {
				return $response;
			}

			if ( 2 === wp_verify_nonce( $received['object_nonce'], 'update-contact_' . $object_id ) ) {
				$response['gform-refresh-nonces'] = array(
					'replace'        => array(
						'_wpnonce' => wp_create_nonce( 'update-object_' . $object_id ),
					),
					'heartbeatNonce' => wp_create_nonce( 'heartbeat-nonce' ),
				);
			}
		}

		return $response;
	}

	public function get_lock_ui( $user_id ) {

		$user = get_userdata( $user_id );

		$locked = $user_id && $user;

		$edit_url = $this->_edit_url;

		$hidden = $locked ? '' : ' hidden';
		if ( $locked ) {

			$message = '<div class="gform-locked-message">
                            <div class="gform-locked-avatar">' . get_avatar( $user->ID, 64 ) . '</div>
                            <p class="currently-editing" tabindex="0">' . sprintf( $this->get_string( 'currently_locked' ), $user->display_name ) . '</p>
                            <p>

                                <a id="gform-take-over-button" style="display:none" class="button button-primary wp-tab-first" href="' . esc_url( add_query_arg( 'get-edit-lock', '1', $edit_url ) ) . '">' . __( 'Take Over', 'gravityforms' ) . '</a>
                                <button id="gform-lock-request-button" class="button button-primary wp-tab-last">' . __( 'Request Control', 'gravityforms' ) . '</button>
                                <a class="button" href="' . esc_url( $this->_redirect_url ) . '">' . $this->get_string( 'cancel' ) . '</a>
                            </p>
                            <div id="gform-lock-request-status">
                                <!-- placeholder -->
                            </div>
                        </div>';

		} else {

			$message = '<div class="gform-taken-over">
                            <div class="gform-locked-avatar"></div>
                            <p class="wp-tab-first" tabindex="0">
                                <span class="currently-editing"></span><br>
                            </p>
                            <p>
                                <a id="gform-release-lock-button" class="button button-primary wp-tab-last"  href="' . esc_url( add_query_arg( 'release-edit-lock', '1', $edit_url ) ) . '">' . $this->get_string( 'accept' ) . '</a>
                                <button id="gform-reject-lock-request-button" style="display:none"  class="button button-primary wp-tab-last">' . __( 'Reject Request', 'gravityforms' ) . '</button>
                            </p>
                        </div>';

		}
		$html = '<div id="gform-lock-dialog" class="notification-dialog-wrap' . $hidden . '">
                    <div class="notification-dialog-background"></div>
                    <div class="notification-dialog">';
		$html .= $message;

		$html .= '   </div>
                 </div>';

		return $html;
	}

	public function get_string( $string_key ) {
		$strings = $this->get_strings();

		return rgar( $strings, $string_key );
	}

	// helper functions for the list page

	public function list_row_class( $object_id, $echo = true ) {
		$locked_class = $this->is_locked( $object_id ) ? 'wp-locked' : '';
		$classes      = ' gf-locking ' . $locked_class;
		if ( $echo ) {
			echo $classes;
		}

		return $classes;
	}

	public function is_locked( $object_id ) {
		if ( ! $user_id = GFCache::get( self::PREFIX_EDIT_LOCK . $this->_object_type . '_' . $object_id ) ) {
			return false;
		}

		if ( $user_id != get_current_user_id() ) {
			return true;
		}

		return false;
	}

	public function lock_indicator( $echo = true ) {

		$lock_indicator = '<div class="locked-indicator"></div>';

		if ( $echo ) {
			echo $lock_indicator;
		}

		return $lock_indicator;
	}

	public function lock_info( $object_id, $echo = true ) {
		$user_id = $this->check_lock( $object_id );

		if ( ! $user_id ) {
			return '';
		}

		if ( $user_id && $user = get_userdata( $user_id ) ) {
			$locked_avatar = get_avatar( $user->ID, 18 );
			$locked_text   = esc_html( sprintf( $this->get_string( 'currently_editing' ), $user->display_name ) );
		} else {
			$locked_avatar = $locked_text = '';
		}

		$locked_info = '<div class="locked-info"><span class="locked-avatar">' . $locked_avatar . '</span> <span class="locked-text">' . $locked_text . "</span></div>\n";

		if ( $echo ) {
			echo $locked_info;
		}

		return $locked_info;
	}

	protected function is_page( $page_name ) {

		return $page_name == GFForms::get_page();
	}

}