<?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->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' => $_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( $_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( $_POST['p2p_id'] );

		$this->refresh_candidates();
	}

	public function ajax_clear_connections() {
		$r = $this->ctype->disconnect( $_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(
			$_REQUEST['from'], $_REQUEST['paged'], $_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();
	}
}

