<?php

namespace App\Models;

class TvShow extends Model
{
    protected string $table = 'tv_shows';
    protected array $fillable = [
        'title',
        'overview',
        'creator',
        'genre',
        'cast',
        'first_air_date',
        'last_air_date',
        'number_of_seasons',
        'number_of_episodes',
        'rating',
        'imdb_id',
        'tmdb_id',
        'tvdb_id',
        'poster_url',
        'backdrop_url',
        'is_favorite',
        'metadata',
        'source_id'
    ];

    protected array $casts = [
        'number_of_seasons' => 'int',
        'number_of_episodes' => 'int',
        'rating' => 'float',
        'is_favorite' => 'bool',
        'first_air_date' => 'date',
        'last_air_date' => 'date',
        'metadata' => 'array'
    ];

    /**
     * Remove an actor from this TV show
     */
    public function removeActor(int $actorId): bool
    {
        $stmt = $this->pdo->prepare("
            DELETE FROM actor_tv_show
            WHERE tv_show_id = :tv_show_id AND actor_id = :actor_id
        ");
        return $stmt->execute([
            'tv_show_id' => $this->id,
            'actor_id' => $actorId
        ]);
    }

    /**
     * Update the cast field with actor names
     */
    public function updateCastField(): bool
    {
        $actors = $this->actors();
        $actorNames = array_column($actors, 'name');
        $castString = implode(', ', $actorNames);

        return $this->update($this->id, [
            'cast' => $castString
        ]);
    }

    /**
     * Get TV show statistics
     */
    public static function getStats(\PDO $pdo): array
    {
        $stmt = $pdo->query("
            SELECT
                COUNT(*) as total_tv_shows,
                COUNT(CASE WHEN is_favorite = 1 THEN 1 END) as favorite_tv_shows,
                AVG(rating) as avg_rating
            FROM tv_shows
        ");
        return $stmt->fetch(\PDO::FETCH_ASSOC);
    }

    /**
     * Get total count with optional search
     */
    public static function getTotalCount(\PDO $pdo, string $search = ''): int
    {
        $sql = "SELECT COUNT(*) as count FROM tv_shows t JOIN sources s ON t.source_id = s.id";
        $params = [];

        if (!empty($search)) {
            $sql .= " WHERE t.title LIKE :search";
            $params['search'] = "%{$search}%";
        }

        $stmt = $pdo->prepare($sql);
        $stmt->execute($params);
        return (int) $stmt->fetch()['count'];
    }

    /**
     * Get all TV shows with pagination and optional search
     */
    public static function getAllWithPagination(\PDO $pdo, int $page, int $perPage, string $search = ''): array
    {
        $offset = ($page - 1) * $perPage;

        $sql = "
            SELECT t.*, s.display_name as source_name
            FROM tv_shows t
            JOIN sources s ON t.source_id = s.id
        ";
        $params = [];

        if (!empty($search)) {
            $sql .= " WHERE t.title LIKE :search";
            $params['search'] = "%{$search}%";
        }

        $sql .= " ORDER BY t.title ASC LIMIT :limit OFFSET :offset";

        $stmt = $pdo->prepare($sql);
        $stmt->bindValue(':limit', $perPage, \PDO::PARAM_INT);
        $stmt->bindValue(':offset', $offset, \PDO::PARAM_INT);

        foreach ($params as $key => $value) {
            $stmt->bindValue(":{$key}", $value);
        }

        $stmt->execute();
        return $stmt->fetchAll(\PDO::FETCH_ASSOC);
    }

    /**
     * Toggle favorite status
     */
    public function toggleFavorite(): bool
    {
        return $this->update($this->id, [
            'is_favorite' => !$this->is_favorite
        ]);
    }

    /**
     * Update rating
     */
    public function updateRating(float $rating): bool
    {
        return $this->update($this->id, [
            'rating' => min(10.0, max(0.0, $rating))
        ]);
    }

    /**
     * Get the source relationship
     */
    public function source(): ?Source
    {
        $stmt = $this->pdo->prepare("SELECT * FROM sources WHERE id = :source_id");
        $stmt->execute(['source_id' => $this->source_id]);
        $sourceData = $stmt->fetch(\PDO::FETCH_ASSOC);

        return $sourceData ? new Source($this->pdo, $sourceData) : null;
    }

    public function getSeasonsWithEpisodes(): array
    {
        // Get all episodes for this TV show, grouped by season
        $stmt = $this->pdo->prepare("
            SELECT season_number,
                   COUNT(*) as episode_count,
                   SUM(CASE WHEN watched = 1 THEN 1 ELSE 0 END) as watched_episodes
            FROM tv_episodes
            WHERE tv_show_id = :tv_show_id
            GROUP BY season_number
            ORDER BY season_number ASC
        ");
        $stmt->execute(['tv_show_id' => $this->id]);
        $seasonStats = $stmt->fetchAll(\PDO::FETCH_ASSOC);

        $seasons = [];

        // For each season, get the episodes and create a season object
        foreach ($seasonStats as $stat) {
            $seasonNumber = $stat['season_number'];

            // Get episodes for this season
            $stmt = $this->pdo->prepare("
                SELECT e.*
                FROM tv_episodes e
                WHERE e.tv_show_id = :tv_show_id AND e.season_number = :season_number
                ORDER BY e.episode_number ASC
            ");
            $stmt->execute([
                'tv_show_id' => $this->id,
                'season_number' => $seasonNumber
            ]);
            $episodes = $stmt->fetchAll(\PDO::FETCH_ASSOC);

            // Create a season object (simulating the old seasons table structure)
            $seasons[] = [
                'id' => null, // No seasons table, so no ID
                'season_number' => $seasonNumber,
                'episode_count' => (int)$stat['episode_count'],
                'watched_episodes' => (int)$stat['watched_episodes'],
                'episodes' => $episodes
            ];
        }

        return $seasons;
    }

/**
 * Get similar TV shows based on genres
 */
public function getSimilarShows(int $limit = 6): array
{
    $genres = $this->genre ? explode(',', $this->genre) : [];
    $placeholders = str_repeat('?,', count($genres) - 1) . '?';
    
    $sql = "
        SELECT t.*, 
               COUNT(DISTINCT g.genre) as matching_genres
        FROM tv_shows t
        CROSS JOIN (SELECT TRIM(value) as genre 
                   FROM json_each('[\"" . str_replace(',', '","', str_replace('"', '\\"', $this->genre)) . "\"]')
                   WHERE value != '') g
        WHERE t.id != ? 
          AND t.genre LIKE '%' || g.genre || '%'
        GROUP BY t.id
        HAVING matching_genres > 0
        ORDER BY matching_genres DESC, t.rating DESC
        LIMIT ?
    ";
    
    $params = array_merge([$this->id, $limit]);
    $stmt = $this->pdo->prepare($sql);
    $stmt->execute($params);
    
    return $stmt->fetchAll(\PDO::FETCH_ASSOC);
}

/**
 * Record that this TV show was viewed
 */
public function recordView(): bool
{
    $stmt = $this->pdo->prepare("
        INSERT OR REPLACE INTO tv_show_views 
        (tv_show_id, view_count, last_viewed_at) 
        VALUES (?, COALESCE((SELECT view_count FROM tv_show_views WHERE tv_show_id = ?), 0) + 1, CURRENT_TIMESTAMP)
    ");
    return $stmt->execute([$this->id, $this->id]);
}

/**
 * Get all available genres from TV shows
 */
public static function getAvailableGenres(\PDO $pdo): array
{
    $stmt = $pdo->query("
        SELECT DISTINCT TRIM(value) as genre
        FROM tv_shows,
             json_each('[\"' || REPLACE(genre, ',', '\",\"') || '\"]')
        WHERE genre IS NOT NULL AND genre != ''
        ORDER BY genre
    ");
    return $stmt->fetchAll(\PDO::FETCH_COLUMN);
}

/**
 * Get all available years from TV shows' first_air_date
 */
public static function getAvailableYears(\PDO $pdo): array
{
    $stmt = $pdo->query("
        SELECT DISTINCT strftime('%Y', first_air_date) as year
        FROM tv_shows
        WHERE first_air_date IS NOT NULL
        ORDER BY year DESC
    ");
    return $stmt->fetchAll(\PDO::FETCH_COLUMN);
}

}