<?php
/**
 * Shortcodes handler.
 *
 * @package WP_FediStream
 */

namespace WP_FediStream\Frontend;

use WP_FediStream\Plugin;

// Prevent direct file access.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Registers and handles all plugin shortcodes.
 */
class Shortcodes {

    /**
     * Plugin instance.
     *
     * @var Plugin
     */
    private Plugin $plugin;

    /**
     * Whether running in unlicensed mode.
     *
     * @var bool
     */
    private bool $unlicensed_mode = false;

    /**
     * Constructor.
     *
     * @param bool $unlicensed_mode Whether to run in unlicensed mode.
     */
    public function __construct( bool $unlicensed_mode = false ) {
        $this->plugin          = Plugin::get_instance();
        $this->unlicensed_mode = $unlicensed_mode;
        $this->register_shortcodes();
    }

    /**
     * Get the unlicensed message HTML.
     *
     * @return string
     */
    private function get_unlicensed_message(): string {
        return '<div class="fedistream-unlicensed-notice" style="padding: 20px; background: #f0f0f1; border-left: 4px solid #dba617; margin: 10px 0;">'
            . '<p style="margin: 0; color: #50575e;">'
            . esc_html__( 'This content requires a valid FediStream license.', 'wp-fedistream' )
            . '</p></div>';
    }

    /**
     * Register all shortcodes.
     *
     * @return void
     */
    private function register_shortcodes(): void {
        add_shortcode( 'fedistream_artist', array( $this, 'render_artist' ) );
        add_shortcode( 'fedistream_album', array( $this, 'render_album' ) );
        add_shortcode( 'fedistream_track', array( $this, 'render_track' ) );
        add_shortcode( 'fedistream_playlist', array( $this, 'render_playlist' ) );
        add_shortcode( 'fedistream_latest_releases', array( $this, 'render_latest_releases' ) );
        add_shortcode( 'fedistream_popular_tracks', array( $this, 'render_popular_tracks' ) );
        add_shortcode( 'fedistream_artists', array( $this, 'render_artists_grid' ) );
        add_shortcode( 'fedistream_player', array( $this, 'render_player' ) );
    }

    /**
     * Render single artist shortcode.
     *
     * [fedistream_artist id="123" show_albums="true" show_tracks="true"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_artist( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'id'          => 0,
                'slug'        => '',
                'show_albums' => 'true',
                'show_tracks' => 'true',
                'layout'      => 'full', // full, card, compact
            ),
            $atts,
            'fedistream_artist'
        );

        $post = $this->get_post( $atts, 'fedistream_artist' );
        if ( ! $post ) {
            TemplateLoader::exit_shortcode_context();
            return '';
        }

        $context = array(
            'post'        => TemplateLoader::get_artist_data( $post ),
            'show_albums' => filter_var( $atts['show_albums'], FILTER_VALIDATE_BOOLEAN ),
            'show_tracks' => filter_var( $atts['show_tracks'], FILTER_VALIDATE_BOOLEAN ),
            'layout'      => sanitize_key( $atts['layout'] ),
        );

        $template = 'card' === $atts['layout'] ? 'partials/card-artist' : 'shortcodes/artist';

        return $this->render_template( $template, $context );
    }

    /**
     * Render single album shortcode.
     *
     * [fedistream_album id="123" show_tracks="true"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_album( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'id'          => 0,
                'slug'        => '',
                'show_tracks' => 'true',
                'layout'      => 'full', // full, card, compact
            ),
            $atts,
            'fedistream_album'
        );

        $post = $this->get_post( $atts, 'fedistream_album' );
        if ( ! $post ) {
            TemplateLoader::exit_shortcode_context();
            return '';
        }

        $context = array(
            'post'        => TemplateLoader::get_album_data( $post ),
            'show_tracks' => filter_var( $atts['show_tracks'], FILTER_VALIDATE_BOOLEAN ),
            'layout'      => sanitize_key( $atts['layout'] ),
        );

        $template = 'card' === $atts['layout'] ? 'partials/card-album' : 'shortcodes/album';

        return $this->render_template( $template, $context );
    }

    /**
     * Render single track shortcode.
     *
     * [fedistream_track id="123" show_player="true"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_track( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'id'          => 0,
                'slug'        => '',
                'show_player' => 'true',
                'layout'      => 'full', // full, card, compact
            ),
            $atts,
            'fedistream_track'
        );

        $post = $this->get_post( $atts, 'fedistream_track' );
        if ( ! $post ) {
            TemplateLoader::exit_shortcode_context();
            return '';
        }

        $context = array(
            'post'        => TemplateLoader::get_track_data( $post ),
            'show_player' => filter_var( $atts['show_player'], FILTER_VALIDATE_BOOLEAN ),
            'layout'      => sanitize_key( $atts['layout'] ),
        );

        $template = 'card' === $atts['layout'] ? 'partials/card-track' : 'shortcodes/track';

        return $this->render_template( $template, $context );
    }

    /**
     * Render playlist shortcode.
     *
     * [fedistream_playlist id="123" show_tracks="true"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_playlist( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'id'          => 0,
                'slug'        => '',
                'show_tracks' => 'true',
                'layout'      => 'full', // full, card, compact
            ),
            $atts,
            'fedistream_playlist'
        );

        $post = $this->get_post( $atts, 'fedistream_playlist' );
        if ( ! $post ) {
            TemplateLoader::exit_shortcode_context();
            return '';
        }

        $context = array(
            'post'        => TemplateLoader::get_playlist_data( $post ),
            'show_tracks' => filter_var( $atts['show_tracks'], FILTER_VALIDATE_BOOLEAN ),
            'layout'      => sanitize_key( $atts['layout'] ),
        );

        $template = 'card' === $atts['layout'] ? 'partials/card-playlist' : 'shortcodes/playlist';

        return $this->render_template( $template, $context );
    }

    /**
     * Render latest releases shortcode.
     *
     * [fedistream_latest_releases count="6" type="album" columns="3"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_latest_releases( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'count'   => 6,
                'type'    => '', // album, ep, single, compilation or empty for all
                'columns' => 3,
                'artist'  => 0, // Filter by artist ID
            ),
            $atts,
            'fedistream_latest_releases'
        );

        $query_args = array(
            'post_type'      => 'fedistream_album',
            'posts_per_page' => absint( $atts['count'] ),
            'orderby'        => 'meta_value',
            'meta_key'       => '_fedistream_release_date',
            'order'          => 'DESC',
            'post_status'    => 'publish',
        );

        // Filter by album type.
        if ( ! empty( $atts['type'] ) ) {
            $query_args['meta_query'][] = array(
                'key'   => '_fedistream_album_type',
                'value' => sanitize_key( $atts['type'] ),
            );
        }

        // Filter by artist.
        if ( ! empty( $atts['artist'] ) ) {
            $query_args['meta_query'][] = array(
                'key'   => '_fedistream_artist_id',
                'value' => absint( $atts['artist'] ),
            );
        }

        $query = new \WP_Query( $query_args );
        $posts = array();

        if ( $query->have_posts() ) {
            while ( $query->have_posts() ) {
                $query->the_post();
                $posts[] = TemplateLoader::get_album_data( get_post() );
            }
            wp_reset_postdata();
        }

        $context = array(
            'posts'   => $posts,
            'columns' => absint( $atts['columns'] ),
            'title'   => __( 'Latest Releases', 'wp-fedistream' ),
        );

        return $this->render_template( 'shortcodes/releases-grid', $context );
    }

    /**
     * Render popular tracks shortcode.
     *
     * [fedistream_popular_tracks count="10" columns="1"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_popular_tracks( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'count'   => 10,
                'columns' => 1,
                'artist'  => 0, // Filter by artist ID
                'genre'   => '', // Filter by genre slug
            ),
            $atts,
            'fedistream_popular_tracks'
        );

        $query_args = array(
            'post_type'      => 'fedistream_track',
            'posts_per_page' => absint( $atts['count'] ),
            'orderby'        => 'meta_value_num',
            'meta_key'       => '_fedistream_play_count',
            'order'          => 'DESC',
            'post_status'    => 'publish',
        );

        // Filter by artist.
        if ( ! empty( $atts['artist'] ) ) {
            $query_args['meta_query'][] = array(
                'key'     => '_fedistream_artist_ids',
                'value'   => absint( $atts['artist'] ),
                'compare' => 'LIKE',
            );
        }

        // Filter by genre.
        if ( ! empty( $atts['genre'] ) ) {
            $query_args['tax_query'][] = array(
                'taxonomy' => 'fedistream_genre',
                'field'    => 'slug',
                'terms'    => sanitize_title( $atts['genre'] ),
            );
        }

        $query = new \WP_Query( $query_args );
        $posts = array();

        if ( $query->have_posts() ) {
            while ( $query->have_posts() ) {
                $query->the_post();
                $posts[] = TemplateLoader::get_track_data( get_post() );
            }
            wp_reset_postdata();
        }

        $context = array(
            'posts'   => $posts,
            'columns' => absint( $atts['columns'] ),
            'title'   => __( 'Popular Tracks', 'wp-fedistream' ),
        );

        return $this->render_template( 'shortcodes/tracks-list', $context );
    }

    /**
     * Render artists grid shortcode.
     *
     * [fedistream_artists count="12" columns="4" type="band"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_artists_grid( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'count'   => 12,
                'columns' => 4,
                'type'    => '', // solo, band, duo, collective, or empty for all
                'genre'   => '', // Filter by genre slug
                'orderby' => 'title',
                'order'   => 'ASC',
            ),
            $atts,
            'fedistream_artists'
        );

        $query_args = array(
            'post_type'      => 'fedistream_artist',
            'posts_per_page' => absint( $atts['count'] ),
            'orderby'        => sanitize_key( $atts['orderby'] ),
            'order'          => 'DESC' === strtoupper( $atts['order'] ) ? 'DESC' : 'ASC',
            'post_status'    => 'publish',
        );

        // Filter by artist type.
        if ( ! empty( $atts['type'] ) ) {
            $query_args['meta_query'][] = array(
                'key'   => '_fedistream_artist_type',
                'value' => sanitize_key( $atts['type'] ),
            );
        }

        // Filter by genre.
        if ( ! empty( $atts['genre'] ) ) {
            $query_args['tax_query'][] = array(
                'taxonomy' => 'fedistream_genre',
                'field'    => 'slug',
                'terms'    => sanitize_title( $atts['genre'] ),
            );
        }

        $query = new \WP_Query( $query_args );
        $posts = array();

        if ( $query->have_posts() ) {
            while ( $query->have_posts() ) {
                $query->the_post();
                $posts[] = TemplateLoader::get_artist_data( get_post() );
            }
            wp_reset_postdata();
        }

        $context = array(
            'posts'   => $posts,
            'columns' => absint( $atts['columns'] ),
            'title'   => __( 'Artists', 'wp-fedistream' ),
        );

        return $this->render_template( 'shortcodes/artists-grid', $context );
    }

    /**
     * Render audio player shortcode.
     *
     * [fedistream_player track="123" autoplay="false"]
     *
     * @param array $atts Shortcode attributes.
     * @return string
     */
    public function render_player( array $atts ): string {
        // Enter shortcode context to prevent recursive shortcode processing during data loading.
        TemplateLoader::enter_shortcode_context();

        $atts = shortcode_atts(
            array(
                'track'    => 0,
                'playlist' => 0,
                'album'    => 0,
                'autoplay' => 'false',
                'style'    => 'default', // default, compact, mini
            ),
            $atts,
            'fedistream_player'
        );

        $tracks = array();

        // Get tracks based on source.
        if ( ! empty( $atts['track'] ) ) {
            $post = get_post( absint( $atts['track'] ) );
            if ( $post && 'fedistream_track' === $post->post_type ) {
                $tracks[] = TemplateLoader::get_track_data( $post );
            }
        } elseif ( ! empty( $atts['album'] ) ) {
            $album_id  = absint( $atts['album'] );
            $track_ids = get_post_meta( $album_id, '_fedistream_track_ids', true );
            if ( is_array( $track_ids ) ) {
                foreach ( $track_ids as $track_id ) {
                    $post = get_post( $track_id );
                    if ( $post && 'fedistream_track' === $post->post_type ) {
                        $tracks[] = TemplateLoader::get_track_data( $post );
                    }
                }
            }
        } elseif ( ! empty( $atts['playlist'] ) ) {
            $playlist_id = absint( $atts['playlist'] );
            $track_ids   = get_post_meta( $playlist_id, '_fedistream_track_ids', true );
            if ( is_array( $track_ids ) ) {
                foreach ( $track_ids as $track_id ) {
                    $post = get_post( $track_id );
                    if ( $post && 'fedistream_track' === $post->post_type ) {
                        $tracks[] = TemplateLoader::get_track_data( $post );
                    }
                }
            }
        }

        if ( empty( $tracks ) ) {
            TemplateLoader::exit_shortcode_context();
            return '';
        }

        $context = array(
            'tracks'   => $tracks,
            'autoplay' => filter_var( $atts['autoplay'], FILTER_VALIDATE_BOOLEAN ),
            'style'    => sanitize_key( $atts['style'] ),
        );

        return $this->render_template( 'shortcodes/player', $context );
    }

    /**
     * Get post by ID or slug.
     *
     * @param array  $atts      Shortcode attributes.
     * @param string $post_type Post type.
     * @return \WP_Post|null
     */
    private function get_post( array $atts, string $post_type ): ?\WP_Post {
        if ( ! empty( $atts['id'] ) ) {
            $post = get_post( absint( $atts['id'] ) );
            if ( $post && $post->post_type === $post_type ) {
                return $post;
            }
        }

        if ( ! empty( $atts['slug'] ) ) {
            $posts = get_posts(
                array(
                    'name'           => sanitize_title( $atts['slug'] ),
                    'post_type'      => $post_type,
                    'posts_per_page' => 1,
                    'post_status'    => 'publish',
                )
            );
            if ( ! empty( $posts ) ) {
                return $posts[0];
            }
        }

        return null;
    }

    /**
     * Render a Twig template.
     *
     * @param string $template Template name.
     * @param array  $context  Template context.
     * @return string
     */
    private function render_template( string $template, array $context ): string {
        // Block shortcode rendering while loading page template to prevent recursion.
        // This catches any shortcodes triggered by theme header/footer, widgets, etc.
        if ( TemplateLoader::is_loading_page_template() ) {
            return '<!-- FediStream: shortcode blocked during page template loading -->';
        }

        // Check for unlicensed mode.
        if ( $this->unlicensed_mode ) {
            return $this->get_unlicensed_message();
        }

        // Enter shortcode context to prevent recursive shortcode processing.
        TemplateLoader::enter_shortcode_context();

        try {
            $result = $this->plugin->render( $template, $context );
        } catch ( \Exception $e ) {
            TemplateLoader::exit_shortcode_context();
            if ( WP_DEBUG ) {
                return '<p class="fedistream-error">' . esc_html( $e->getMessage() ) . '</p>';
            }
            return '';
        }

        TemplateLoader::exit_shortcode_context();
        return $result;
    }
}