<?php
/**
 * AJAX handlers for frontend functionality.
 *
 * @package WP_FediStream
 */

namespace WP_FediStream\Frontend;

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

/**
 * Handles AJAX requests for the frontend.
 */
class Ajax {

    /**
     * Constructor.
     */
    public function __construct() {
        // Track data endpoint (public).
        add_action( 'wp_ajax_fedistream_get_track', array( $this, 'get_track' ) );
        add_action( 'wp_ajax_nopriv_fedistream_get_track', array( $this, 'get_track' ) );

        // Record play endpoint (public).
        add_action( 'wp_ajax_fedistream_record_play', array( $this, 'record_play' ) );
        add_action( 'wp_ajax_nopriv_fedistream_record_play', array( $this, 'record_play' ) );
    }

    /**
     * Get track data via AJAX.
     *
     * @return void
     */
    public function get_track(): void {
        // Verify nonce.
        if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( sanitize_key( $_POST['nonce'] ), 'wp-fedistream-nonce' ) ) {
            wp_send_json_error( array( 'message' => __( 'Invalid nonce.', 'wp-fedistream' ) ) );
        }

        $track_id = isset( $_POST['track_id'] ) ? absint( $_POST['track_id'] ) : 0;

        if ( ! $track_id ) {
            wp_send_json_error( array( 'message' => __( 'Invalid track ID.', 'wp-fedistream' ) ) );
        }

        $track = get_post( $track_id );

        if ( ! $track || 'fedistream_track' !== $track->post_type ) {
            wp_send_json_error( array( 'message' => __( 'Track not found.', 'wp-fedistream' ) ) );
        }

        // Check if track is published.
        if ( 'publish' !== $track->post_status ) {
            wp_send_json_error( array( 'message' => __( 'Track not available.', 'wp-fedistream' ) ) );
        }

        // Get audio file.
        $audio_id  = get_post_meta( $track_id, '_fedistream_audio_file', true );
        $audio_url = $audio_id ? wp_get_attachment_url( $audio_id ) : '';

        if ( ! $audio_url ) {
            wp_send_json_error( array( 'message' => __( 'No audio file available.', 'wp-fedistream' ) ) );
        }

        // Get track metadata.
        $thumbnail_id = get_post_thumbnail_id( $track_id );
        $thumbnail    = $thumbnail_id ? wp_get_attachment_image_url( $thumbnail_id, 'medium' ) : '';

        // Get album info.
        $album_id = get_post_meta( $track_id, '_fedistream_album_id', true );
        $album    = $album_id ? get_post( $album_id ) : null;

        // Get artists.
        $artist_ids = get_post_meta( $track_id, '_fedistream_artist_ids', true );
        $artists    = array();

        if ( is_array( $artist_ids ) && ! empty( $artist_ids ) ) {
            foreach ( $artist_ids as $artist_id ) {
                $artist = get_post( $artist_id );
                if ( $artist && 'fedistream_artist' === $artist->post_type ) {
                    $artists[] = array(
                        'id'   => $artist->ID,
                        'name' => $artist->post_title,
                        'link' => get_permalink( $artist->ID ),
                    );
                }
            }
        }

        // Get duration.
        $duration           = get_post_meta( $track_id, '_fedistream_duration', true );
        $duration_formatted = '';
        if ( $duration ) {
            $mins               = floor( $duration / 60 );
            $secs               = $duration % 60;
            $duration_formatted = $mins . ':' . str_pad( $secs, 2, '0', STR_PAD_LEFT );
        }

        $data = array(
            'id'                 => $track->ID,
            'title'              => $track->post_title,
            'permalink'          => get_permalink( $track->ID ),
            'audio_url'          => $audio_url,
            'thumbnail'          => $thumbnail,
            'artists'            => $artists,
            'artist'             => ! empty( $artists ) ? $artists[0]['name'] : '',
            'album'              => $album ? $album->post_title : '',
            'album_id'           => $album ? $album->ID : 0,
            'album_link'         => $album ? get_permalink( $album->ID ) : '',
            'duration'           => $duration,
            'duration_formatted' => $duration_formatted,
            'explicit'           => (bool) get_post_meta( $track_id, '_fedistream_explicit', true ),
        );

        wp_send_json_success( $data );
    }

    /**
     * Record a track play via AJAX.
     *
     * @return void
     */
    public function record_play(): void {
        // Verify nonce.
        if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( sanitize_key( $_POST['nonce'] ), 'wp-fedistream-nonce' ) ) {
            wp_send_json_error( array( 'message' => __( 'Invalid nonce.', 'wp-fedistream' ) ) );
        }

        $track_id = isset( $_POST['track_id'] ) ? absint( $_POST['track_id'] ) : 0;

        if ( ! $track_id ) {
            wp_send_json_error( array( 'message' => __( 'Invalid track ID.', 'wp-fedistream' ) ) );
        }

        $track = get_post( $track_id );

        if ( ! $track || 'fedistream_track' !== $track->post_type ) {
            wp_send_json_error( array( 'message' => __( 'Track not found.', 'wp-fedistream' ) ) );
        }

        global $wpdb;

        // Insert play record.
        $table = $wpdb->prefix . 'fedistream_plays';

        // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
        $wpdb->insert(
            $table,
            array(
                'track_id'  => $track_id,
                'user_id'   => get_current_user_id() ?: null,
                'played_at' => current_time( 'mysql' ),
            ),
            array( '%d', '%d', '%s' )
        );

        // Update play count in post meta.
        $play_count = (int) get_post_meta( $track_id, '_fedistream_play_count', true );
        update_post_meta( $track_id, '_fedistream_play_count', $play_count + 1 );

        wp_send_json_success(
            array(
                'message'    => __( 'Play recorded.', 'wp-fedistream' ),
                'play_count' => $play_count + 1,
            )
        );
    }
}