<?php
declare(strict_types=1);

namespace Plugins\Artists;

use Core\Http\Response;
use Core\Services\Auth;
use Core\Views\View;
use Core\Services\Database;
use PDO;
use Throwable;

class ArtistsController
{
    private View $view;

    public function __construct()
    {
        $this->view = new View(__DIR__ . '/views');
    }

    public function index(): Response
    {
        $db = Database::get();
        $page = null;
        $artists = [];
        if ($db instanceof PDO) {
            try {
                $stmt = $db->prepare("SELECT title, content_html FROM ac_pages WHERE slug = 'artists' AND is_published = 1 LIMIT 1");
                $stmt->execute();
                $page = $stmt->fetch(PDO::FETCH_ASSOC) ?: null;
                $listStmt = $db->query("
                    SELECT id, name, slug, country, avatar_url
                    FROM ac_artists
                    WHERE is_active = 1
                    ORDER BY created_at DESC
                ");
                $artists = $listStmt ? $listStmt->fetchAll(PDO::FETCH_ASSOC) : [];
            } catch (Throwable $e) {
            }
        }

        return new Response($this->view->render('site/index.php', [
            'title' => (string)($page['title'] ?? 'Artists'),
            'content_html' => (string)($page['content_html'] ?? ''),
            'artists' => $artists,
        ]));
    }

    public function show(): Response
    {
        $slug = trim((string)($_GET['slug'] ?? ''));
        $artist = null;
        $artistReleases = [];
        if ($slug !== '') {
            $db = Database::get();
            if ($db instanceof PDO) {
                $stmt = $db->prepare("SELECT * FROM ac_artists WHERE slug = :slug AND is_active = 1 LIMIT 1");
                $stmt->execute([':slug' => $slug]);
                $artist = $stmt->fetch(PDO::FETCH_ASSOC) ?: null;
                if ($artist) {
                    try {
                        $artistIdReady = false;
                        $probe = $db->query("SHOW COLUMNS FROM ac_releases LIKE 'artist_id'");
                        if ($probe && $probe->fetch(PDO::FETCH_ASSOC)) {
                            $artistIdReady = true;
                        }

                        if ($artistIdReady) {
                            $relStmt = $db->prepare("
                                SELECT id, title, slug, release_date, cover_url, artist_name
                                FROM ac_releases
                                WHERE is_published = 1
                                  AND (release_date IS NULL OR release_date <= :today)
                                  AND (artist_id = :artist_id OR artist_name = :artist_name)
                                ORDER BY release_date DESC, created_at DESC
                                LIMIT 2
                            ");
                            $relStmt->execute([
                                ':today' => date('Y-m-d'),
                                ':artist_id' => (int)($artist['id'] ?? 0),
                                ':artist_name' => (string)($artist['name'] ?? ''),
                            ]);
                        } else {
                            $relStmt = $db->prepare("
                                SELECT id, title, slug, release_date, cover_url, artist_name
                                FROM ac_releases
                                WHERE is_published = 1
                                  AND (release_date IS NULL OR release_date <= :today)
                                  AND artist_name = :artist_name
                                ORDER BY release_date DESC, created_at DESC
                                LIMIT 2
                            ");
                            $relStmt->execute([
                                ':today' => date('Y-m-d'),
                                ':artist_name' => (string)($artist['name'] ?? ''),
                            ]);
                        }

                        $artistReleases = $relStmt->fetchAll(PDO::FETCH_ASSOC) ?: [];
                    } catch (Throwable $e) {
                        $artistReleases = [];
                    }
                }
            }
        }
        return new Response($this->view->render('site/show.php', [
            'title' => $artist ? (string)$artist['name'] : 'Artist Profile',
            'artist' => $artist,
            'artist_releases' => $artistReleases,
        ]));
    }

    public function adminIndex(): Response
    {
        if (!Auth::check()) {
            return new Response('', 302, ['Location' => '/admin/login']);
        }
        if (!Auth::hasRole(['admin', 'manager'])) {
            return new Response('', 302, ['Location' => '/admin']);
        }
        $tableReady = $this->artistsTableReady();
        $socialReady = $this->socialColumnReady();
        $artists = [];
        $pageId = 0;
        $pagePublished = 0;
        if ($tableReady) {
            $db = Database::get();
            if ($db instanceof PDO) {
                $stmt = $db->query("SELECT id, name, slug, country, avatar_url, is_active FROM ac_artists ORDER BY created_at DESC");
                $artists = $stmt ? $stmt->fetchAll(PDO::FETCH_ASSOC) : [];
                $pageStmt = $db->prepare("SELECT id, is_published FROM ac_pages WHERE slug = 'artists' LIMIT 1");
                $pageStmt->execute();
                $pageRow = $pageStmt->fetch(PDO::FETCH_ASSOC);
                if ($pageRow) {
                    $pageId = (int)($pageRow['id'] ?? 0);
                    $pagePublished = (int)($pageRow['is_published'] ?? 0);
                }
            }
        }
        return new Response($this->view->render('admin/index.php', [
            'title' => 'Artists',
            'table_ready' => $tableReady,
            'social_ready' => $socialReady,
            'artists' => $artists,
            'page_id' => $pageId,
            'page_published' => $pagePublished,
        ]));
    }

    public function adminNew(): Response
    {
        return $this->adminEdit(0);
    }

    public function adminEdit(int $id = 0): Response
    {
        if (!Auth::check()) {
            return new Response('', 302, ['Location' => '/admin/login']);
        }
        if (!Auth::hasRole(['admin', 'manager'])) {
            return new Response('', 302, ['Location' => '/admin']);
        }
        $artist = [
            'id' => 0,
            'name' => '',
            'slug' => '',
            'bio' => '',
            'credits' => '',
            'country' => '',
            'avatar_url' => '',
            'social_links' => '',
            'is_active' => 1,
        ];
        if ($id > 0) {
            $db = Database::get();
            if ($db instanceof PDO) {
                $stmt = $db->prepare("SELECT * FROM ac_artists WHERE id = :id LIMIT 1");
                $stmt->execute([':id' => $id]);
                $row = $stmt->fetch(PDO::FETCH_ASSOC);
                if ($row) {
                    $artist = array_merge($artist, $row);
                }
            }
        }
        if (!empty($_GET['avatar_url']) && $artist['avatar_url'] === '') {
            $artist['avatar_url'] = (string)$_GET['avatar_url'];
        }
        return new Response($this->view->render('admin/edit.php', [
            'title' => $id > 0 ? 'Edit Artist' : 'New Artist',
            'artist' => $artist,
            'error' => '',
        ]));
    }

    public function adminSave(): Response
    {
        if (!Auth::check()) {
            return new Response('', 302, ['Location' => '/admin/login']);
        }
        if (!Auth::hasRole(['admin', 'manager'])) {
            return new Response('', 302, ['Location' => '/admin']);
        }
        $id = (int)($_POST['id'] ?? 0);
        $name = trim((string)($_POST['name'] ?? ''));
        $slug = trim((string)($_POST['slug'] ?? ''));
        $bio = trim((string)($_POST['bio'] ?? ''));
        $credits = trim((string)($_POST['credits'] ?? ''));
        $country = trim((string)($_POST['country'] ?? ''));
        $avatarUrl = trim((string)($_POST['avatar_url'] ?? ''));
        $socialLinks = [
            'website' => $this->normalizeUrl(trim((string)($_POST['social_website'] ?? ''))),
            'instagram' => $this->normalizeUrl(trim((string)($_POST['social_instagram'] ?? ''))),
            'soundcloud' => $this->normalizeUrl(trim((string)($_POST['social_soundcloud'] ?? ''))),
            'spotify' => $this->normalizeUrl(trim((string)($_POST['social_spotify'] ?? ''))),
            'youtube' => $this->normalizeUrl(trim((string)($_POST['social_youtube'] ?? ''))),
            'tiktok' => $this->normalizeUrl(trim((string)($_POST['social_tiktok'] ?? ''))),
            'bandcamp' => $this->normalizeUrl(trim((string)($_POST['social_bandcamp'] ?? ''))),
            'beatport' => $this->normalizeUrl(trim((string)($_POST['social_beatport'] ?? ''))),
            'facebook' => $this->normalizeUrl(trim((string)($_POST['social_facebook'] ?? ''))),
            'x' => $this->normalizeUrl(trim((string)($_POST['social_x'] ?? ''))),
        ];
        $socialLinks = array_filter($socialLinks, static fn($value) => $value !== '');
        $socialJson = $socialLinks ? json_encode($socialLinks, JSON_UNESCAPED_SLASHES) : null;
        $socialReady = $this->socialColumnReady();
        $creditsReady = $this->creditsColumnReady();
        $isActive = isset($_POST['is_active']) ? 1 : 0;

        if ($name === '') {
            return $this->saveError($id, 'Name is required.');
        }
        $slug = $slug !== '' ? $this->slugify($slug) : $this->slugify($name);

        $db = Database::get();
        if (!$db instanceof PDO) {
            return $this->saveError($id, 'Database unavailable.');
        }

        $dupStmt = $id > 0
            ? $db->prepare("SELECT id FROM ac_artists WHERE slug = :slug AND id != :id LIMIT 1")
            : $db->prepare("SELECT id FROM ac_artists WHERE slug = :slug LIMIT 1");
        $params = $id > 0 ? [':slug' => $slug, ':id' => $id] : [':slug' => $slug];
        $dupStmt->execute($params);
        if ($dupStmt->fetch()) {
            return $this->saveError($id, 'Slug already exists.');
        }

        try {
            if ($id > 0) {
                $stmt = $db->prepare("
                    UPDATE ac_artists
                    SET name = :name, slug = :slug, bio = :bio" . ($creditsReady ? ", credits = :credits" : "") . ", country = :country,
                        avatar_url = :avatar_url" . ($socialReady ? ", social_links = :social_links" : "") . ",
                        is_active = :is_active
                    WHERE id = :id
                ");
                $params = [
                    ':name' => $name,
                    ':slug' => $slug,
                    ':bio' => $bio !== '' ? $bio : null,
                    ':country' => $country !== '' ? $country : null,
                    ':avatar_url' => $avatarUrl !== '' ? $avatarUrl : null,
                    ':is_active' => $isActive,
                    ':id' => $id,
                ];
                if ($creditsReady) {
                    $params[':credits'] = $credits !== '' ? $credits : null;
                }
                if ($socialReady) {
                    $params[':social_links'] = $socialJson;
                }
                $stmt->execute($params);
            } else {
                $stmt = $db->prepare("
                    INSERT INTO ac_artists (name, slug, bio" . ($creditsReady ? ", credits" : "") . ", country, avatar_url" . ($socialReady ? ", social_links" : "") . ", is_active)
                    VALUES (:name, :slug, :bio" . ($creditsReady ? ", :credits" : "") . ", :country, :avatar_url" . ($socialReady ? ", :social_links" : "") . ", :is_active)
                ");
                $params = [
                    ':name' => $name,
                    ':slug' => $slug,
                    ':bio' => $bio !== '' ? $bio : null,
                    ':country' => $country !== '' ? $country : null,
                    ':avatar_url' => $avatarUrl !== '' ? $avatarUrl : null,
                    ':is_active' => $isActive,
                ];
                if ($creditsReady) {
                    $params[':credits'] = $credits !== '' ? $credits : null;
                }
                if ($socialReady) {
                    $params[':social_links'] = $socialJson;
                }
                $stmt->execute($params);
            }
        } catch (Throwable $e) {
            error_log('AC artists save error: ' . $e->getMessage());
            return $this->saveError($id, 'Unable to save artist. Check table columns and input.');
        }

        return new Response('', 302, ['Location' => '/admin/artists']);
    }

    public function adminDelete(): Response
    {
        if (!Auth::check()) {
            return new Response('', 302, ['Location' => '/admin/login']);
        }
        if (!Auth::hasRole(['admin', 'manager'])) {
            return new Response('', 302, ['Location' => '/admin']);
        }
        $id = (int)($_POST['id'] ?? 0);
        $db = Database::get();
        if ($db instanceof PDO && $id > 0) {
            $stmt = $db->prepare("DELETE FROM ac_artists WHERE id = :id");
            $stmt->execute([':id' => $id]);
        }
        return new Response('', 302, ['Location' => '/admin/artists']);
    }

    public function adminUpload(): Response
    {
        if (!Auth::check()) {
            return new Response('', 302, ['Location' => '/admin/login']);
        }
        if (!Auth::hasRole(['admin', 'manager'])) {
            return new Response('', 302, ['Location' => '/admin']);
        }
        $file = $_FILES['artist_avatar'] ?? null;
        $artistId = (int)($_POST['artist_id'] ?? 0);
        if (!$file || !isset($file['tmp_name'])) {
            return $this->uploadRedirect($artistId);
        }
        if ($file['error'] !== UPLOAD_ERR_OK) {
            return $this->uploadRedirect($artistId, $this->uploadErrorMessage((int)$file['error']));
        }

        $tmp = (string)$file['tmp_name'];
        if ($tmp === '' || !is_uploaded_file($tmp)) {
            return $this->uploadRedirect($artistId);
        }

        $info = getimagesize($tmp);
        if ($info === false) {
            return $this->uploadRedirect($artistId, 'Avatar must be an image.');
        }
        $ext = image_type_to_extension($info[2], false);
        $allowed = ['jpg', 'jpeg', 'png', 'webp'];
        if (!in_array($ext, $allowed, true)) {
            return $this->uploadRedirect($artistId, 'Avatar must be JPG, PNG, or WEBP.');
        }

        $uploadDir = __DIR__ . '/../../uploads/media';
        if (!is_dir($uploadDir) && !mkdir($uploadDir, 0755, true)) {
            return $this->uploadRedirect($artistId, 'Upload directory is not writable.');
        }
        if (!is_writable($uploadDir)) {
            return $this->uploadRedirect($artistId, 'Upload directory is not writable.');
        }

        $baseName = preg_replace('~[^a-z0-9]+~', '-', strtolower((string)$file['name'])) ?? 'avatar';
        $baseName = trim($baseName, '-');
        $fileName = ($baseName !== '' ? $baseName : 'avatar') . '-' . date('YmdHis') . '.' . $ext;
        $dest = $uploadDir . '/' . $fileName;
        if (!move_uploaded_file($tmp, $dest)) {
            return $this->uploadRedirect($artistId, 'Upload failed.');
        }

        $fileUrl = '/uploads/media/' . $fileName;
        $fileType = (string)($file['type'] ?? '');
        $fileSize = (int)($file['size'] ?? 0);

        $db = Database::get();
        if ($db instanceof PDO) {
            try {
                $stmt = $db->prepare("
                    INSERT INTO ac_media (file_name, file_url, file_type, file_size, folder_id)
                    VALUES (:name, :url, :type, :size, NULL)
                ");
                $stmt->execute([
                    ':name' => (string)$file['name'],
                    ':url' => $fileUrl,
                    ':type' => $fileType,
                    ':size' => $fileSize,
                ]);
            } catch (Throwable $e) {
            }
        }

        if ($artistId > 0 && $db instanceof PDO) {
            $stmt = $db->prepare("UPDATE ac_artists SET avatar_url = :url WHERE id = :id");
            $stmt->execute([':url' => $fileUrl, ':id' => $artistId]);
        }

        return $this->uploadRedirect($artistId, '', $fileUrl);
    }

    public function adminInstall(): Response
    {
        if (!Auth::check()) {
            return new Response('', 302, ['Location' => '/admin/login']);
        }
        if (!Auth::hasRole(['admin', 'manager'])) {
            return new Response('', 302, ['Location' => '/admin']);
        }

        $db = Database::get();
        if ($db instanceof PDO) {
            try {
                $db->exec("
                    CREATE TABLE IF NOT EXISTS ac_artists (
                        id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
                        name VARCHAR(200) NOT NULL,
                        slug VARCHAR(200) NOT NULL UNIQUE,
                        bio MEDIUMTEXT NULL,
                        credits MEDIUMTEXT NULL,
                        country VARCHAR(120) NULL,
                        avatar_url VARCHAR(255) NULL,
                        social_links TEXT NULL,
                        is_active TINYINT(1) NOT NULL DEFAULT 1,
                        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
                    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
                ");
                $db->exec("ALTER TABLE ac_artists ADD COLUMN credits MEDIUMTEXT NULL");
                $db->exec("ALTER TABLE ac_artists ADD COLUMN social_links TEXT NULL");
            } catch (Throwable $e) {
            }
        }

        return new Response('', 302, ['Location' => '/admin/artists']);
    }

    private function artistsTableReady(): bool
    {
        $db = Database::get();
        if (!$db instanceof PDO) {
            return false;
        }
        try {
            $stmt = $db->query("SELECT 1 FROM ac_artists LIMIT 1");
            return $stmt !== false;
        } catch (Throwable $e) {
            return false;
        }
    }

    private function socialColumnReady(): bool
    {
        $db = Database::get();
        if (!$db instanceof PDO) {
            return false;
        }
        try {
            $stmt = $db->query("SHOW COLUMNS FROM ac_artists LIKE 'social_links'");
            $row = $stmt ? $stmt->fetch(PDO::FETCH_ASSOC) : null;
            return (bool)$row;
        } catch (Throwable $e) {
            return false;
        }
    }

    private function creditsColumnReady(): bool
    {
        $db = Database::get();
        if (!$db instanceof PDO) {
            return false;
        }
        try {
            $stmt = $db->query("SHOW COLUMNS FROM ac_artists LIKE 'credits'");
            $row = $stmt ? $stmt->fetch(PDO::FETCH_ASSOC) : null;
            return (bool)$row;
        } catch (Throwable $e) {
            return false;
        }
    }

    private function saveError(int $id, string $message): Response
    {
        return new Response($this->view->render('admin/edit.php', [
            'title' => $id > 0 ? 'Edit Artist' : 'New Artist',
            'artist' => [
                'id' => $id,
                'name' => (string)($_POST['name'] ?? ''),
                'slug' => (string)($_POST['slug'] ?? ''),
                'bio' => (string)($_POST['bio'] ?? ''),
                'credits' => (string)($_POST['credits'] ?? ''),
                'country' => (string)($_POST['country'] ?? ''),
                'avatar_url' => (string)($_POST['avatar_url'] ?? ''),
                'social_links' => '',
                'is_active' => isset($_POST['is_active']) ? 1 : 0,
            ],
            'error' => $message,
        ]));
    }

    private function slugify(string $value): string
    {
        $value = strtolower(trim($value));
        $value = preg_replace('~[^a-z0-9]+~', '-', $value) ?? $value;
        $value = trim($value, '-');
        return $value !== '' ? $value : 'artist';
    }

    private function uploadRedirect(int $artistId, string $error = '', string $url = ''): Response
    {
        if ($artistId > 0) {
            $target = '/admin/artists/edit?id=' . $artistId;
        } else {
            $target = '/admin/artists/new';
        }
        if ($url !== '') {
            $target .= '&avatar_url=' . rawurlencode($url);
        }
        if ($error !== '') {
            $target .= '&upload_error=' . rawurlencode($error);
        }
        return new Response('', 302, ['Location' => $target]);
    }

    private function uploadErrorMessage(int $code): string
    {
        $max = (string)ini_get('upload_max_filesize');
        $map = [
            UPLOAD_ERR_INI_SIZE => "File exceeds upload_max_filesize ({$max}).",
            UPLOAD_ERR_FORM_SIZE => 'File exceeds form limit.',
            UPLOAD_ERR_PARTIAL => 'File was only partially uploaded.',
            UPLOAD_ERR_NO_TMP_DIR => 'Missing temp upload directory.',
            UPLOAD_ERR_CANT_WRITE => 'Failed to write file to disk.',
            UPLOAD_ERR_EXTENSION => 'Upload stopped by a PHP extension.',
            UPLOAD_ERR_NO_FILE => 'No file uploaded.',
        ];
        return $map[$code] ?? 'Upload failed.';
    }

    private function normalizeUrl(string $value): string
    {
        if ($value === '') {
            return '';
        }
        if (preg_match('~^(https?://)~i', $value)) {
            return $value;
        }
        return 'https://' . $value;
    }
}