<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api;

use App\Events\UserAccessedApi;
use App\Http\Controllers\BasePageController;
use App\Models\Category;
use App\Models\Release;
use App\Models\Settings;
use App\Models\User;
use App\Models\UserRequest;
use App\Services\RegistrationStatusService;
use App\Services\Releases\ReleaseBrowseService;
use App\Services\Releases\ReleaseSearchService;
use App\Transformers\ApiTransformer;
use App\Transformers\CategoryTransformer;
use App\Transformers\DetailsTransformer;
use Illuminate\Foundation\Application;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Routing\Redirector;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Cache;

class ApiV2Controller extends BasePageController
{
    private ApiController $api;

    private ReleaseSearchService $releaseSearchService;

    private ReleaseBrowseService $releaseBrowseService;

    public function __construct(
        ApiController $api,
        ReleaseSearchService $releaseSearchService,
        ReleaseBrowseService $releaseBrowseService
    ) {
        $this->api = $api;
        $this->releaseSearchService = $releaseSearchService;
        $this->releaseBrowseService = $releaseBrowseService;
    }

    /**
     * Validate API token and return cached user, or null on failure.
     * Caches user lookup for 5 minutes to reduce DB hits.
     */
    private function resolveUser(Request $request): ?User
    {
        if ($request->missing('api_token') || $request->isNotFilled('api_token')) {
            return null;
        }

        $apiToken = $request->input('api_token');
        $userCacheKey = 'api_user:'.md5((string) $apiToken);

        return Cache::remember($userCacheKey, 300, function () use ($apiToken) {
            return User::query()
                ->where('api_token', $apiToken)
                ->with('role')
                ->first();
        });
    }

    /**
     * Build the standard user stats portion of an API response.
     * Uses the consolidated single-query + 60s cache from ApiController.
     *
     * @return array<string, mixed>
     */
    private function buildUserStatsResponse(User $user): array
    {
        $userStats = $this->api->getCachedUserStats($user->id);

        return [
            'apiCurrent' => (int) ($userStats->api_count ?? 0),
            'apiMax' => $user->role->apirequests,
            'grabCurrent' => (int) ($userStats->grab_count ?? 0),
            'grabMax' => $user->role->downloadrequests,
            'apiOldestTime' => $userStats->api_time ? Carbon::parse($userStats->api_time)->toRfc2822String() : '',
            'grabOldestTime' => $userStats->grab_time ? Carbon::parse($userStats->grab_time)->toRfc2822String() : '',
        ];
    }

    public function capabilities(): JsonResponse
    {
        // Cache the full capabilities response for 10 minutes
        $capabilities = Cache::remember('api_v2_capabilities', 600, function () {
            $category = Category::getForApi();

            return [
                'server' => [
                    'title' => config('app.name'),
                    'strapline' => Settings::settingValue('strapline'),
                    'email' => config('mail.from.address'),
                    'url' => url('/'),
                ],
                'limits' => [
                    'max' => 100,
                    'default' => 100,
                ],
                'searching' => [
                    'search' => ['available' => 'yes', 'supportedParams' => 'id'],
                    'tv-search' => ['available' => 'yes', 'supportedParams' => 'id,vid,tvdbid,traktid,rid,tvmazeid,imdbid,tmdbid,season,ep'],
                    'movie-search' => ['available' => 'yes', 'supportedParams' => 'id, imdbid, tmdbid, traktid'],
                    'audio-search' => ['available' => 'no',  'supportedParams' => ''],
                ],
                'categories' => fractal($category, new CategoryTransformer),
            ];
        });

        $registrationStatus = app(RegistrationStatusService::class)->resolve();
        $capabilities['registration'] = [
            'available' => $registrationStatus['available'] ? 'yes' : 'no',
            'open' => $registrationStatus['is_open'] ? 'yes' : 'no',
        ];

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

    /**
     * @throws \Throwable
     */
    public function movie(Request $request): JsonResponse
    {
        $user = $this->resolveUser($request);
        if (! $user) {
            return response()->json(['error' => 'Missing or invalid API key'], 403);
        }

        UserRequest::addApiRequest($user->id, $request->getRequestUri());
        event(new UserAccessedApi($user, $request->ip()));

        // Get request parameters efficiently
        $imdbId = (int) $request->input('imdbid', -1);
        $tmdbId = (int) $request->input('tmdbid', -1);
        $traktId = (int) $request->input('traktid', -1);
        $minSize = max(0, (int) $request->input('minsize', 0));
        $searchName = $request->input('id', '');
        $offset = $this->api->offset($request);
        $limit = $this->api->limit($request);
        $categoryID = $this->api->categoryID($request);
        $maxAge = $this->api->maxAge($request);
        $catExclusions = User::getCategoryExclusionById($user->id);

        // Create cache key for movie search results
        $searchCacheKey = 'api_movie_search:'.md5(serialize([
            $imdbId, $tmdbId, $traktId, $offset, $limit, $searchName,
            $categoryID, $maxAge, $minSize, $catExclusions,
        ]));

        // Cache search results for 10 minutes
        $relData = Cache::remember($searchCacheKey, 600, function () use (
            $imdbId, $tmdbId, $traktId, $offset, $limit, $searchName,
            $categoryID, $maxAge, $minSize, $catExclusions
        ) {
            return $this->releaseSearchService->moviesSearch(
                $imdbId,
                $tmdbId,
                $traktId,
                $offset,
                $limit,
                $searchName,
                $categoryID,
                $maxAge,
                $minSize,
                $catExclusions
            );
        });

        $response = array_merge(
            ['Total' => $relData[0]->_totalrows ?? 0],
            $this->buildUserStatsResponse($user),
            ['Results' => fractal($relData, new ApiTransformer($user))]
        );

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

    /**
     * @throws \Exception
     * @throws \Throwable
     */
    public function apiSearch(Request $request): JsonResponse
    {
        $user = $this->resolveUser($request);
        if (! $user) {
            return response()->json(['error' => 'Missing or invalid API key'], 403);
        }

        UserRequest::addApiRequest($user->id, $request->getRequestUri());
        event(new UserAccessedApi($user, $request->ip()));

        $offset = $this->api->offset($request);
        $catExclusions = User::getCategoryExclusionById($user->id);
        $minSize = $request->has('minsize') && $request->input('minsize') > 0 ? $request->input('minsize') : 0;
        $maxAge = $this->api->maxAge($request);
        $groupName = $this->api->group($request);
        if (is_array($groupName)) {
            $groupName = $groupName[0] ?? -1;
        }
        $categoryID = $this->api->categoryID($request);
        $limit = $this->api->limit($request);

        if ($request->has('id')) {
            $relData = $this->releaseSearchService->apiSearch(
                $request->input('id'),
                $groupName,
                $offset,
                $limit,
                $maxAge,
                $catExclusions,
                $categoryID,
                $minSize
            );
        } else {
            $relData = $this->releaseBrowseService->getBrowseRangeForApi(
                1,
                $categoryID,
                $offset,
                $limit,
                '',
                $maxAge,
                $catExclusions,
                $groupName,
                $minSize
            );
        }

        $response = array_merge(
            ['Total' => $relData[0]->_totalrows ?? 0],
            $this->buildUserStatsResponse($user),
            ['Results' => fractal($relData, new ApiTransformer($user))]
        );

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

    /**
     * @throws \Exception
     * @throws \Throwable
     */
    public function tv(Request $request): JsonResponse
    {
        $user = $this->resolveUser($request);
        if (! $user) {
            return response()->json(['error' => 'Missing or invalid API key'], 403);
        }

        $catExclusions = User::getCategoryExclusionById($user->id);
        $minSize = $request->has('minsize') && $request->input('minsize') > 0 ? $request->input('minsize') : 0;
        $this->api->verifyEmptyParameter($request, 'id');
        $this->api->verifyEmptyParameter($request, 'vid');
        $this->api->verifyEmptyParameter($request, 'tvdbid');
        $this->api->verifyEmptyParameter($request, 'traktid');
        $this->api->verifyEmptyParameter($request, 'rid');
        $this->api->verifyEmptyParameter($request, 'tvmazeid');
        $this->api->verifyEmptyParameter($request, 'imdbid');
        $this->api->verifyEmptyParameter($request, 'tmdbid');
        $this->api->verifyEmptyParameter($request, 'season');
        $this->api->verifyEmptyParameter($request, 'ep');
        $maxAge = $this->api->maxAge($request);
        UserRequest::addApiRequest($user->id, $request->getRequestUri());
        event(new UserAccessedApi($user, $request->ip()));

        $siteIdArr = [
            'id' => $request->input('vid') ?? null,
            'tvdb' => $request->input('tvdbid') ?? null,
            'trakt' => $request->input('traktid') ?? null,
            'tvrage' => $request->input('rid') ?? null,
            'tvmaze' => $request->input('tvmazeid') ?? null,
            'imdb' => $request->input('imdbid') ?? null,
            'tmdb' => $request->input('tmdbid') ?? null,
        ];

        // Process season only queries or Season and Episode/Airdate queries

        $series = $request->input('season') ?? '';
        $episode = $request->input('ep') ?? '';

        if (preg_match('#^(19|20)\d{2}$#', $series, $year) && str_contains($episode, '/')) {
            $airDate = str_replace('/', '-', $year[0].'-'.$episode);
        }

        $relData = $this->releaseSearchService->apiTvSearch(
            $siteIdArr,
            $series,
            $episode,
            $airDate ?? '',
            $this->api->offset($request),
            $this->api->limit($request),
            $request->input('id') ?? '',
            $this->api->categoryID($request),
            $maxAge,
            $minSize,
            $catExclusions
        );

        $response = array_merge(
            ['Total' => $relData[0]->_totalrows ?? 0],
            $this->buildUserStatsResponse($user),
            ['Results' => fractal($relData, new ApiTransformer($user))]
        );

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

    public function getNzb(Request $request): Application|JsonResponse|Redirector|RedirectResponse|\Illuminate\Contracts\Foundation\Application
    {
        $user = $this->resolveUser($request);
        if (! $user) {
            return response()->json(['error' => 'Missing or invalid API key'], 403);
        }

        event(new UserAccessedApi($user, $request->ip()));
        UserRequest::addApiRequest($user->id, $request->getRequestUri());
        $relData = Release::checkGuidForApi($request->input('id'));
        if ($relData) {
            return redirect('/getnzb?r='.$request->input('api_token').'&id='.$request->input('id').(($request->has('del') && $request->input('del') === '1') ? '&del=1' : ''));
        }

        return response()->json(['data' => 'No such item (the guid you provided has no release in our database)'], 404);
    }

    public function details(Request $request): JsonResponse
    {
        $user = $this->resolveUser($request);
        if (! $user) {
            return response()->json(['error' => 'Missing or invalid API key'], 403);
        }
        if ($request->missing('id')) {
            return response()->json(['error' => 'Missing parameter (guid is required for single release details)'], 400);
        }

        UserRequest::addApiRequest($user->id, $request->getRequestUri());
        event(new UserAccessedApi($user, $request->ip()));
        $relData = Release::getByGuidForApi($request->input('id'));

        $relData = fractal($relData, new DetailsTransformer($user));

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