<?php

namespace App\Modules\Movies\Services\Tmdb;

use App\Modules\Movies\Services\Contracts\MovieProvider;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Collection;

class TmdbMovieProvider implements MovieProvider
{
    protected string $baseUrl;
    protected ?string $apiToken;
    protected string $language;
    protected string $imageBase;
    protected string $posterSize;
    protected string $backdropSize;
    protected string $profileSize;
    protected int $cacheTtl;

    public function __construct()
    {
        $this->baseUrl = rtrim(config('movies.tmdb.base_url', 'https://api.themoviedb.org/3'), '/');
        $this->apiToken = config('movies.tmdb.api_token');
        $this->language = (string) config('movies.tmdb.language', 'en-US');
        $this->imageBase = rtrim(config('movies.tmdb.image_base', 'https://image.tmdb.org/t/p/'), '/');
        $this->posterSize = (string) config('movies.tmdb.poster_size', 'w500');
        $this->backdropSize = (string) config('movies.tmdb.backdrop_size', 'w780');
        $this->profileSize = (string) config('movies.tmdb.profile_size', 'w185');
        $this->cacheTtl = (int) config('movies.tmdb.cache_ttl', 3600);
    }

    public function search(string $query, int $page = 1): array
    {
        $query = trim($query);
        if ($query === '') {
            return ['results' => collect(), 'total' => 0, 'page' => 1, 'has_more' => false];
        }

        $cacheKey = sprintf('tmdb.search.%s.p%s.%s', md5($query), $page, $this->language);
        $data = Cache::remember($cacheKey, $this->cacheTtl, function () use ($query, $page) {
            $response = Http::acceptJson()
                ->withHeaders($this->authHeaders())
                ->timeout(6)
                ->retry(3, 300)
                ->get($this->baseUrl . '/search/movie', [
                    'query' => $query,
                    'page' => $page,
                    'include_adult' => false,
                    'language' => $this->language,
                ]);

            if ($response->failed()) {
                abort(502, "Couldn’t reach TMDb. Please try again.");
            }

            return $response->json();
        });

        $total = (int) ($data['total_results'] ?? 0);
        $hasMore = ($data['page'] ?? 1) < ($data['total_pages'] ?? 1);
        $results = collect($data['results'] ?? [])->map(function ($item) {
            return [
                'provider' => 'tmdb',
                'provider_id' => isset($item['id']) ? (string) $item['id'] : null,
                'title' => $item['title'] ?? ($item['original_title'] ?? null),
                'year' => isset($item['release_date']) && $item['release_date'] ? (int) substr($item['release_date'], 0, 4) : null,
                'poster_url' => $this->buildImageUrl($item['poster_path'] ?? null, true),
            ];
        });

        return [
            'results' => $results,
            'total' => $total,
            'page' => (int) ($data['page'] ?? $page),
            'has_more' => $hasMore,
        ];
    }

    public function details(string $id): array
    {
        $id = trim($id);
        $cacheKey = sprintf('tmdb.details.%s.%s', $id, $this->language);
        $data = Cache::remember($cacheKey, $this->cacheTtl, function () use ($id) {
            $response = Http::acceptJson()
                ->withHeaders($this->authHeaders())
                ->timeout(6)
                ->retry(3, 300)
                ->get($this->baseUrl . "/movie/{$id}", [
                    'append_to_response' => 'credits,external_ids',
                    'language' => $this->language,
                ]);

            if ($response->failed()) {
                abort(502, "Couldn’t reach TMDb. Please try again.");
            }

            return $response->json();
        });

        if (!isset($data['id'])) {
            abort(404, 'Movie not found in TMDb');
        }

        $genres = collect($data['genres'] ?? [])->pluck('name')->filter()->values()->all();
        $cast = collect($data['credits']['cast'] ?? [])->sortByDesc('popularity')->take(15);
        $actors = $cast->pluck('name')->filter()->values()->all();
        // Map of actor name => TMDb profile image URL (FULL URL), used to store on Actor records
        $actorsProfiles = $cast
            ->mapWithKeys(function ($c) {
                $name = $c['name'] ?? null;
                $path = $c['profile_path'] ?? null;
                if (!$name || !$path) return [];
                return [$name => $this->buildProfileUrl($path)];
            })
            ->all();
        $directors = collect($data['credits']['crew'] ?? [])->filter(fn($c) => ($c['job'] ?? null) === 'Director')->pluck('name')->unique()->values()->all();
        $studios = collect($data['production_companies'] ?? [])->pluck('name')->filter()->values()->all();
        $countries = collect($data['production_countries'] ?? [])->pluck('name')->filter()->values()->all();
        $languages = collect($data['spoken_languages'] ?? [])->pluck('english_name')->filter()->values()->all();

        // External IDs include imdb_id when available
        $external = [
            'tmdb' => isset($data['id']) ? (string) $data['id'] : null,
        ];
        if (!empty($data['external_ids']['imdb_id'])) {
            $external['imdb'] = $data['external_ids']['imdb_id'];
        }

        return [
            'provider' => 'tmdb',
            'provider_id' => isset($data['id']) ? (string) $data['id'] : null,
            'external_ids' => $external,
            'title' => $data['title'] ?? null,
            'original_title' => $data['original_title'] ?? ($data['title'] ?? null),
            'description' => $data['overview'] ?? null,
            'poster_url' => $this->buildImageUrl($data['poster_path'] ?? null, true),
            'backdrop_url' => $this->buildImageUrl($data['backdrop_path'] ?? null, false),
            'genres' => $genres,
            'rating' => null, // Certification requires extra call; left null for now
            'release_date' => $data['release_date'] ?? null,
            'year' => isset($data['release_date']) && $data['release_date'] ? (int) substr($data['release_date'], 0, 4) : null,
            'runtime' => isset($data['runtime']) ? (int) $data['runtime'] : null,
            'actors' => $actors,
            'actors_profiles' => $actorsProfiles,
            'directors' => $directors,
            'studios' => $studios,
            'countries' => $countries,
            'languages' => $languages,
        ];
    }

    protected function authHeaders(): array
    {
        return $this->apiToken ? ['Authorization' => 'Bearer ' . $this->apiToken] : [];
    }

    protected function buildImageUrl(?string $path, bool $poster = true): ?string
    {
        if (!$path) return null;
        $size = $poster ? $this->posterSize : $this->backdropSize;
        return rtrim($this->imageBase, '/') . '/' . trim($size, '/') . $path;
    }

    protected function buildProfileUrl(?string $path): ?string
    {
        if (!$path) return null;
        return rtrim($this->imageBase, '/') . '/' . trim($this->profileSize, '/') . $path;
    }
}