<?php
/*
Plugin Name: Also In This Series
Plugin URI: http://portfolio.planetjon.ca/projects/also-in-this-series/
Description: Group related posts in a series with a custom Series taxonomy. and a list of all posts in the series in your content.
Version: 1.4.1
Requires at least: 3.5.0
Tested up to: 4.3.1
Author: Jonathan Weatherhead
Author URI: http://jonathanweatherhead.com
Text Domain: also-in-this-series
Domain Path: /languages/
License: GPL2
License URI: http://www.gnu.org/licenses/gpl-2.0.html
*/

class AlsoInThisSeries {
	const version = '1.4.1';
	const slug = 'also-in-this-series';
	const taxonomy = 'series';

	private static $config = null;

	static function config( $key = null ) {
		if( ! isset( self::$config ) )
			return;

		return $key !== null ? self::$config[ $key ] : self::$config;
	}

	static function displaySeries( $args = array() ) {
		$fargs = shortcode_atts( array(
			'series-slug' => false,
			'seriesSlug' => false,
			'use-frame' => true
		), $args );

		$post = get_post();
		$series = false;
		$framing = false;
		$seriesSlug = $fargs[ 'series-slug' ] or $seriesSlug = $fargs[ 'seriesSlug' ];
		$frameWidth = AlsoInThisSeries::config( 'window-series-listing' );

		if( $seriesSlug )
			$series = get_term_by( 'slug', $seriesSlug, self::taxonomy );
		else
			$post and $postseries = get_the_terms( $post->ID, self::taxonomy ) and $series = array_shift( $postseries );

		if( ! $series )
			return;

		$postsinseries = get_posts( array(
			'tax_query' => array(
				array(
					'taxonomy' => self::taxonomy,
					'field' => 'id',
					'terms' => (int) $series->term_id
				)
			),
			'posts_per_page' => -1,
			'order' => 'asc'
		) );

		if( $fargs[ 'use-frame' ] && $frameWidth && !$seriesSlug && is_single() ) {
			$framing = true;
			$pivot = 0;
			foreach( $postsinseries as $index => $seriespost ) {
				$pivot = $index;
				if( $seriespost->ID == $post->ID )
					break;
			}

			$frame_left = max( 0, $pivot - floor( ( $frameWidth - 1 ) / 2 ) );
			$frame_right = min( count( $postsinseries ) - 1, $pivot + floor( ( $frameWidth - 1 ) / 2 ) );

			$ldiff = $frame_left - ( $pivot - floor( ( $frameWidth - 1 ) / 2 ) );
			$rdiff = ( $pivot + floor( ( $frameWidth - 1 ) / 2 ) ) - $frame_right;

			if( $ldiff && ! $rdiff )
				$frame_right = min( count( $postsinseries ) - 1, $frame_right + $ldiff );
			elseif( $rdiff && ! $ldiff )
				$frame_left = max( 0, $frame_left - $rdiff );

			$postsinseries = array_slice( $postsinseries, $frame_left, 1 + $frame_right - $frame_left );
		}

		ob_start();
		include 'views/serieslisting.php';
		$content = ob_get_contents();
		ob_end_clean();

		return $content;
	}

	static function plugins_loaded() {
		$defaults = array(
			'insert-in-content' => 'append',
			'window-series-listing' => false,
			'archive-sort-order' => false
		);

		self::$config = array_merge( $defaults, get_option( self::slug, $defaults ) );

		load_plugin_textdomain( self::slug, false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
	}

	static function init() {
		add_shortcode( 'alsointhisseries', array( __CLASS__, 'displaySeries' ) );
	}

	static function pre_get_posts( $query ) {
		$sortOrder = self::config( 'archive-sort-order' );

		if( isset( $query->query[ self::taxonomy ] ) && $sortOrder )
			$query->query_vars[ 'order' ] = $sortOrder;

		return $query;
	}

	static function the_content( $content ) {
		$before = $after = '';
		$alsointhisseries = self::displaySeries();

		if( is_tax( self::taxonomy ) )
			return $content;

		switch( self::config( 'insert-in-content' ) ) {
			case 'prepend' :
			$before = $alsointhisseries;
			break;

			case 'append' :
			$after = $alsointhisseries;
			break;

			default :
		}

		return $before . $content . $after;
	}

	static function activate() {
		flush_rewrite_rules( $hard = false );
	}

	static function deactivate() {
	}

	static function uninstall() {
		delete_option( self::slug );
	}

}

require_once 'plugin-taxonomies.php';
require_once 'plugin-widgets.php';

register_activation_hook( __FILE__, array( 'AlsoInThisSeries', 'activate' ) );
register_deactivation_hook( __FILE__, array( 'AlsoInThisSeries', 'deactivate' ) );
register_uninstall_hook( __FILE__, array( 'AlsoInThisSeries', 'uninstall' ) );

add_action( 'plugins_loaded', array( 'AlsoInThisSeries', 'plugins_loaded' ) );
add_action( 'init', array( 'AlsoInThisSeries', 'init' ) );
add_action( 'pre_get_posts', array( 'AlsoInThisSeries', 'pre_get_posts' ) );
add_action( 'the_content', array( 'AlsoInThisSeries', 'the_content' ), 1 );

if( is_admin() && ! defined( 'DOING_AJAX' ) )
	include_once plugin_dir_path( __file__ ) . 'admin-plugin.php';