<?php

require_once __DIR__.'/../bootstrap.php';

use App\Classes\ApiHandler;
use GuzzleHttp\Client;

class ArtistImportHandler extends ApiHandler
{
    private string $artistImportToken;

    private string $placeholderImageId = '4cef75db-831f-4f5d-9333-79eaa5bb55ee';

    private string $navidromeApiUrl;

    private string $navidromeAuthToken;

    public function __construct()
    {
        parent::__construct();

        $this->ensureCliAccess();
        $this->artistImportToken = getenv('ARTIST_IMPORT_TOKEN');
        $this->navidromeApiUrl = getenv('NAVIDROME_API_URL');
        $this->navidromeAuthToken = getenv('NAVIDROME_API_TOKEN');
    }

    public function handleRequest(): void
    {
        $input = json_decode(file_get_contents('php://input'), true);

        if (! $input) {
            $this->sendJsonResponse('error', 'Invalid or missing JSON body', 400);
        }

        $providedToken = $input['token'] ?? null;
        $artistId = $input['artistId'] ?? null;

        if ($providedToken !== $this->artistImportToken) {
            $this->sendJsonResponse('error', 'Unauthorized access', 401);
        }
        if (! $artistId) {
            $this->sendJsonResponse('error', 'Artist ID is required', 400);
        }

        try {
            $artistData = $this->fetchNavidromeArtist($artistId);
            $albumData = $this->fetchNavidromeAlbums($artistId);
            $genre = $albumData[0]['genre'] ?? ($albumData[0]['genres'][0]['name'] ?? '');
            $artistExists = $this->processArtist($artistData, $genre);

            if ($artistExists) {
                $this->processAlbums($artistId, $artistData->name, $albumData);
            }

            $this->sendJsonResponse('message', 'Artist and albums synced successfully', 200);
        } catch (\Exception $e) {
            $this->sendJsonResponse('error', 'Error: '.$e->getMessage(), 500);
        }
    }

    private function sendJsonResponse(string $key, string $message, int $statusCode): void
    {
        http_response_code($statusCode);
        header('Content-Type: application/json');

        echo json_encode([$key => $message]);

        exit();
    }

    private function fetchNavidromeArtist(string $artistId): object
    {
        $client = new Client();
        $response = $client->get("{$this->navidromeApiUrl}/api/artist/{$artistId}", [
            'headers' => [
                'x-nd-authorization' => "Bearer {$this->navidromeAuthToken}",
                'Accept' => 'application/json',
            ],
        ]);

        return json_decode($response->getBody());
    }

    private function fetchNavidromeAlbums(string $artistId): array
    {
        $client = new Client();
        $response = $client->get("{$this->navidromeApiUrl}/api/album", [
            'query' => [
                '_end' => 0,
                '_order' => 'ASC',
                '_sort' => 'max_year',
                '_start' => 0,
                'artist_id' => $artistId,
            ],
            'headers' => [
                'x-nd-authorization' => "Bearer {$this->navidromeAuthToken}",
                'Accept' => 'application/json',
            ],
        ]);

        return json_decode($response->getBody(), true);
    }

    private function processArtist(object $artistData, string $genreName = ''): bool
    {
        $artistName = $artistData->name ?? '';

        if (! $artistName) {
            throw new \Exception('Artist name is missing.');
        }

        $existingArtist = $this->getArtistByName($artistName);

        if ($existingArtist) {
            return true;
        }

        $artistKey = sanitizeMediaString($artistName);
        $slug = "/music/artists/{$artistKey}";
        $description = strip_tags($artistData->biography ?? '');
        $genre = $this->resolveGenreId(strtolower($genreName));
        $starred = $artistData->starred ?? false;
        $artistPayload = [
            'name_string' => $artistName,
            'slug' => $slug,
            'description' => $description,
            'tentative' => true,
            'art' => $this->placeholderImageId,
            'mbid' => '',
            'favorite' => $starred,
            'genres' => $genre,
        ];

        $this->makeRequest('POST', 'artists', ['json' => $artistPayload]);

        return true;
    }

    private function processAlbums(string $artistId, string $artistName, array $albumData): void
    {
        $artist = $this->getArtistByName($artistName);

        if (! $artist) {
            throw new \Exception('Artist not found after insert.');
        }

        $existingAlbums = $this->getExistingAlbums($artist['id']);
        $existingAlbumKeys = array_column($existingAlbums, 'key');

        foreach ($albumData as $album) {
            $albumName = $album['name'] ?? '';
            $releaseYearRaw = $album['date'] ?? null;
            $releaseYear = null;

            if ($releaseYearRaw && preg_match('/^\d{4}/', $releaseYearRaw, $matches)) {
                $releaseYear = (int) $matches[0];
            }

            $artistKey = sanitizeMediaString($artistName);
            $albumKey = "{$artistKey}-".sanitizeMediaString($albumName);

            if (in_array($albumKey, $existingAlbumKeys)) {
                error_log("Skipping existing album: {$albumName}");

                continue;
            }

            try {
                $albumPayload = [
                    'name' => $albumName,
                    'key' => $albumKey,
                    'release_year' => $releaseYear,
                    'artist' => $artist['id'],
                    'artist_name' => $artistName,
                    'art' => $this->placeholderImageId,
                    'tentative' => true,
                ];

                $this->makeRequest('POST', 'albums', ['json' => $albumPayload]);
            } catch (\Exception $e) {
                error_log("Error adding album '{$albumName}': ".$e->getMessage());
            }
        }
    }

    private function getArtistByName(string $nameString): ?array
    {
        $response = $this->fetchFromApi('artists', 'name_string=eq.'.urlencode($nameString));

        return $response[0] ?? null;
    }

    private function getExistingAlbums(string $artistId): array
    {
        return $this->fetchFromApi('albums', 'artist=eq.'.urlencode($artistId));
    }

    private function resolveGenreId(string $genreName): ?string
    {
        $genres = $this->fetchFromApi('genres', 'name=eq.'.urlencode(strtolower($genreName)));

        return $genres[0]['id'] ?? null;
    }
}

$handler = new ArtistImportHandler();
$handler->handleRequest();