<?php

/**
 * A metabox in wp-admin
 */
class P2P_Box {
	private $ctype;

	private $args;

	private $columns;

	private static $enqueued_scripts = false;

	private static $admin_box_qv = array(
		'update_post_term_cache' => false,
		'update_post_meta_cache' => false,
		'post_status'            => 'any',
	);

	function __construct( $args, $columns, $ctype ) {
		$this->args = $args;

		$this->columns = $columns;

		$this->ctype = $ctype;

		$this->labels = $this->ctype->get( 'opposite', 'labels' );
	}

	public function init_scripts() {

		if ( self::$enqueued_scripts ) {
			return;
		}

		wp_enqueue_style(
			'p2p-box',
			plugins_url( 'box.css', __FILE__ ),
			array(),
			P2P_PLUGIN_VERSION
		);

		wp_register_script(
			'mustache',
			plugins_url( 'mustache.js', __FILE__ ),
			array(),
			'0.7.2',
			true
		);

		wp_enqueue_script(
			'p2p-box',
			plugins_url( 'box.js', __FILE__ ),
			array( 'backbone', 'mustache' ),
			P2P_PLUGIN_VERSION,
			true
		);

		wp_localize_script(
			'p2p-box',
			'P2PAdminL10n',
			array(
				'nonce'                => wp_create_nonce( P2P_BOX_NONCE ),
				'spinner'              => admin_url( 'images/wpspin_light.gif' ),
				'deleteConfirmMessage' => __( 'Are you sure you want to delete all connections?', P2P_TEXTDOMAIN ),
			)
		);

		self::$enqueued_scripts = true;

		add_action( 'admin_footer', array( __CLASS__, 'add_templates' ) );
	}

	static function add_templates() {
		self::add_template( 'tab-list' );
		self::add_template( 'table-row' );
	}

	private static function add_template( $slug ) {
		echo html(
			'script',
			array(
				'type' => 'text/html',
				'id'   => "p2p-template-$slug",
			),
			file_get_contents( dirname( __FILE__ ) . "/templates/$slug.html" )
		);
	}

	function render( $item ) {
		$extra_qv = array_merge(
			self::$admin_box_qv,
			array(
				'p2p:context'  => 'admin_box',
				'p2p:per_page' => -1,
			)
		);

		$this->connected_items = $this->ctype->get_connected( $item, $extra_qv, 'abstract' )->items;

		$data = array(
			'attributes'         => $this->render_data_attributes(),
			'connections'        => $this->render_connections_table( $item ),
			'create-connections' => $this->render_create_connections( $item ),
			'help'               => isset( $this->labels->help ) ? $this->labels->help : '',
		);

		echo P2P_Mustache::render( 'box', $data );
	}

	protected function render_data_attributes() {
		$data_attr = array(
			'p2p_type'              => $this->ctype->name,
			'duplicate_connections' => $this->ctype->duplicate_connections,
			'cardinality'           => $this->ctype->get( 'opposite', 'cardinality' ),
			'direction'             => $this->ctype->get_direction(),
		);

		$data_attr_str = array();
		foreach ( $data_attr as $key => $value ) {
			$data_attr_str[] = "data-$key='" . $value . "'";
		}

		return implode( ' ', $data_attr_str );
	}

	protected function render_connections_table( $item ) {
		$data = array();

		if ( empty( $this->connected_items ) ) {
			$data['hide'] = 'style="display:none"';
		}

		$tbody = array();
		foreach ( $this->connected_items as $item ) {
			$tbody[] = $this->connection_row( $item->p2p_id, $item );
		}
		$data['tbody'] = $tbody;

		foreach ( $this->columns as $key => $field ) {
			$data['thead'][] = array(
				'column' => $key,
				'title'  => $field->get_title(),
			);
		}

		return $data;
	}

	protected function render_create_connections( $item ) {
		$data = array(
			'label' => $this->labels->create,
		);

		if ( 'one' == $this->ctype->get( 'opposite', 'cardinality' ) ) {
			if ( ! empty( $this->connected_items ) ) {
				$data['hide'] = 'style="display:none"';
			}
		}

		// Search tab
		$tab_content = P2P_Mustache::render(
			'tab-search',
			array(
				'placeholder' => $this->labels->search_items,
			)
		);

		$data['tabs'][] = array(
			'tab-id'      => 'search',
			'tab-title'   => __( 'Search', P2P_TEXTDOMAIN ),
			'is-active'   => array( true ),
			'tab-content' => $tab_content,
		);

		// "Create post" tab
		if ( $this->can_create_post() ) {
			$tab_content = P2P_Mustache::render(
				'tab-create-post',
				array(
					'title' => $this->labels->add_new_item,
				)
			);

			$data['tabs'][] = array(
				'tab-id'      => 'create-post',
				'tab-title'   => $this->labels->new_item,
				'tab-content' => $tab_content,
			);
		}

		$data['show-tab-headers'] = count( $data['tabs'] ) > 1 ? array( true ) : false;

		return $data;
	}

	protected function connection_row( $p2p_id, $item, $render = false ) {
		$item->post_title = apply_filters( 'p2p_connected_title', $item->get_title(), $item->get_object(), $this->ctype );

		$data = array();

		foreach ( $this->columns as $key => $field ) {
			$data['columns'][] = array(
				'column'  => $key,
				'content' => $field->render( $p2p_id, $item ),
			);
		}

		if ( ! $render ) {
			return $data;
		}

		return P2P_Mustache::render( 'table-row', $data );
	}

	protected function candidate_row( $item ) {
		$title = apply_filters( 'p2p_candidate_title', $item->get_title(), $item->get_object(), $this->ctype );

		$title_data = array_merge(
			$this->columns['title']->get_data( $item ),
			array(
				'title'   => $title,
				'item-id' => $item->get_id(),
			)
		);

		$data = array();

		$data['columns'][] = array(
			'column'  => 'create',
			'content' => P2P_Mustache::render( 'column-create', $title_data ),
		);

		return $data;
	}

	protected function candidate_rows( $current_post_id, $page = 1, $search = '' ) {
		$extra_qv = array_merge(
			self::$admin_box_qv,
			array(
				'p2p:context'  => 'admin_box_candidates',
				'p2p:search'   => $search,
				'p2p:page'     => $page,
				'p2p:per_page' => 5,
			)
		);

		$candidate = $this->ctype->get_connectable( $current_post_id, $extra_qv, 'abstract' );

		if ( empty( $candidate->items ) ) {
			return html( 'div class="p2p-notice"', $this->labels->not_found );
		}

		$data = array();

		foreach ( $candidate->items as $item ) {
			$data['rows'][] = $this->candidate_row( $item );
		}

		if ( $candidate->total_pages > 1 ) {
			$data['navigation'] = array(
				'current-page'    => number_format_i18n( $candidate->current_page ),
				'total-pages'     => number_format_i18n( $candidate->total_pages ),

				'total-pages-raw' => $candidate->total_pages,

				'prev-inactive'   => ( 1 == $candidate->current_page ) ? 'inactive' : '',
				'next-inactive'   => ( $candidate->total_pages == $candidate->current_page ) ? 'inactive' : '',

				'prev-label'      => __( 'previous', P2P_TEXTDOMAIN ),
				'next-label'      => __( 'next', P2P_TEXTDOMAIN ),
				'of-label'        => __( 'of', P2P_TEXTDOMAIN ),
			);
		}

		return $data;
	}


	// Ajax handlers

	public function ajax_create_post() {
		if ( ! $this->can_create_post() ) {
			die( -1 );
		}

		$args = array(
			'post_title'  => sanitize_text_field( $_POST['post_title'] ),
			'post_author' => get_current_user_id(),
			'post_type'   => $this->ctype->get( 'opposite', 'side' )->first_post_type(),
		);

		$from = absint( $_POST['from'] );

		$args = apply_filters( 'p2p_new_post_args', $args, $this->ctype, $from );

		$this->safe_connect( wp_insert_post( $args ) );
	}

	public function ajax_connect() {
		$this->safe_connect( sanitize_text_field( $_POST['to'] ) );
	}

	private function safe_connect( $to ) {
		$from = absint( $_POST['from'] );
		$to   = absint( $to );

		if ( ! $from || ! $to ) {
			die( -1 );
		}

		$p2p_id = $this->ctype->connect( $from, $to );

		self::maybe_send_error( $p2p_id );

		$item = $this->ctype->get( 'opposite', 'side' )->item_recognize( $to );

		$out = array(
			'row' => $this->connection_row( $p2p_id, $item, true ),
		);

		die( json_encode( $out ) );
	}

	public function ajax_disconnect() {
		p2p_delete_connection( sanitize_text_field( $_POST['p2p_id'] ) );

		$this->refresh_candidates();
	}

	public function ajax_clear_connections() {
		$r = $this->ctype->disconnect( sanitize_text_field( $_POST['from'] ), 'any' );

		self::maybe_send_error( $r );

		$this->refresh_candidates();
	}

	protected static function maybe_send_error( $r ) {
		if ( ! is_wp_error( $r ) ) {
			return;
		}

		$out = array(
			'error' => $r->get_error_message(),
		);

		die( json_encode( $out ) );
	}

	public function ajax_search() {
		$this->refresh_candidates();
	}

	private function refresh_candidates() {
		die(
			json_encode(
				$this->candidate_rows(
					sanitize_text_field( $_REQUEST['from'] ),
					sanitize_text_field( $_REQUEST['paged'] ),
					sanitize_text_field( $_REQUEST['s'] )
				)
			)
		);
	}

	protected function can_create_post() {
		if ( ! $this->args->can_create_post ) {
			return false;
		}

		$side = $this->ctype->get( 'opposite', 'side' );

		return $side->can_create_item();
	}
}