<?php

namespace App\Modules\Movies\Services\Browse;

use App\Modules\Movies\Models\Movie;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use App\Modules\Movies\Services\Contracts\ListMoviesServiceInterface;

class ListMoviesService implements ListMoviesServiceInterface
{
    /**
     * Return a paginated list of movies with optional search, filters, and sort.
     *
     * @param array{
     *   q?: string|null,
     *   per_page?: int|null,
     *   sort?: string|null,
     *   genre?: string|null,
     *   rating?: string|null,
     *   year_min?: int|null,
     *   year_max?: int|null,
     *   actor?: string|null,
     *   director?: string|null,
     *   studio?: string|null,
     * } $params
     */
    public function list(array $params = []): LengthAwarePaginator
    {
        $perPage = (int) ($params['per_page'] ?? 20);
        $q = isset($params['q']) ? trim((string) $params['q']) : '';
        $sort = isset($params['sort']) ? trim((string) $params['sort']) : 'title_asc';

        $genre = isset($params['genre']) ? trim((string) $params['genre']) : '';
        $rating = isset($params['rating']) ? trim((string) $params['rating']) : '';
        $yearMin = isset($params['year_min']) ? (int) $params['year_min'] : null;
        $yearMax = isset($params['year_max']) ? (int) $params['year_max'] : null;
        $actor = isset($params['actor']) ? trim((string) $params['actor']) : '';
        $director = isset($params['director']) ? trim((string) $params['director']) : '';
        $studio = isset($params['studio']) ? trim((string) $params['studio']) : '';

        $query = Movie::query()->with(['genres', 'actors', 'directors']);

        if ($q !== '') {
            $query->where('title', 'like', "%{$q}%");
        }

        if ($genre !== '') {
            $ln = mb_strtolower($genre);
            $query->whereHas('genres', fn($q2) => $q2->whereRaw('lower(name) = ?', [$ln]));
        }
        if ($rating !== '') {
            $query->where('rating', $rating);
        }
        if ($yearMin !== null) {
            $query->where('year', '>=', $yearMin);
        }
        if ($yearMax !== null) {
            $query->where('year', '<=', $yearMax);
        }
        if ($actor !== '') {
            $ln = mb_strtolower($actor);
            $query->whereHas('actors', fn($q2) => $q2->whereRaw('lower(name) = ?', [$ln]));
        }
        if ($director !== '') {
            $ln = mb_strtolower($director);
            $query->whereHas('directors', fn($q2) => $q2->whereRaw('lower(name) = ?', [$ln]));
        }
        if ($studio !== '') {
            $ln = mb_strtolower($studio);
            $query->whereHas('studios', fn($q2) => $q2->whereRaw('lower(name) = ?', [$ln]));
        }

        // Sorting
        switch ($sort) {
            case 'title_desc':
                $query->orderBy('title', 'desc');
                break;
            case 'newest':
                $query->orderBy('created_at', 'desc');
                break;
            case 'oldest':
                $query->orderBy('created_at', 'asc');
                break;
            case 'year_asc':
                $query->orderBy('year', 'asc');
                break;
            case 'year_desc':
                $query->orderBy('year', 'desc');
                break;
            case 'title_asc':
            default:
                $query->orderBy('title', 'asc');
                break;
        }

        return $query->paginate($perPage);
    }
}