<?php

namespace App\Services;

use Illuminate\Http\Client\ConnectionException;
use Illuminate\Http\Client\Response;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use RuntimeException;

class FreepikStockAssetService
{
    public function importForEdit(string $kind, int $assetId): array
    {
        $normalizedKind = $this->normalizeKind($kind);

        return match ($normalizedKind) {
            'images' => $this->importImagePreview($assetId),
            'videos' => $this->importVideoPreview($assetId),
            'icons' => $this->importIconPng($assetId),
            default => throw new RuntimeException('Asset jenis ini belum didukung untuk AI edit di dalam project.'),
        };
    }

    public function downloadToProject(string $kind, int $assetId): array
    {
        $normalizedKind = $this->normalizeKind($kind);

        return match ($normalizedKind) {
            'images' => $this->downloadImageAsset($assetId),
            'videos' => $this->downloadVideoAsset($assetId),
            'icons' => $this->downloadIconAsset($assetId),
            'audio' => $this->downloadMusicAsset($assetId),
            default => throw new RuntimeException('Jenis asset Freepik tidak valid untuk didownload.'),
        };
    }

    private function importImagePreview(int $assetId): array
    {
        $detail = $this->detail('images', $assetId);
        $sourceUrl = trim((string) data_get($detail, 'image.source.url', ''));

        if ($sourceUrl === '') {
            $download = $this->downloadImageAsset($assetId);

            return [
                'type' => 'image',
                'provider' => 'freepik-stock',
                'title' => (string) ($download['title'] ?? 'Freepik image'),
                'url' => $download['public_url'],
                'thumbnail_url' => $download['public_url'],
                'width' => null,
                'height' => null,
                'kind' => 'images',
                'remote_id' => $assetId,
            ];
        }

        $stored = $this->storeRemoteFile($sourceUrl, [
            'folder' => 'freepik_stock/imports/images',
            'filename' => $this->slugFilename((string) data_get($detail, 'title', 'freepik-image'), $sourceUrl),
        ]);

        return [
            'type' => 'image',
            'provider' => 'freepik-stock',
            'title' => (string) data_get($detail, 'title', 'Freepik image'),
            'url' => $stored['public_url'],
            'thumbnail_url' => $stored['public_url'],
            'width' => $this->numericOrNull(data_get($detail, 'image.source.width')),
            'height' => $this->numericOrNull(data_get($detail, 'image.source.height')),
            'kind' => 'images',
            'remote_id' => $assetId,
        ];
    }

    private function importVideoPreview(int $assetId): array
    {
        $detail = $this->detail('videos', $assetId);
        $previewUrl = trim((string) data_get($detail, 'previews.0.url', ''));
        $thumbnailUrl = trim((string) data_get($detail, 'thumbnails.0.url', ''));

        if ($previewUrl === '') {
            throw new RuntimeException('Freepik video preview tidak tersedia untuk AI edit.');
        }

        $stored = $this->storeRemoteFile($previewUrl, [
            'folder' => 'freepik_stock/imports/videos',
            'filename' => $this->slugFilename((string) data_get($detail, 'name', 'freepik-video'), $previewUrl),
        ]);

        if ($thumbnailUrl !== '') {
            try {
                $thumbnailStored = $this->storeRemoteFile($thumbnailUrl, [
                    'folder' => 'freepik_stock/imports/video_thumbs',
                    'filename' => $this->slugFilename((string) data_get($detail, 'name', 'freepik-video-thumb'), $thumbnailUrl),
                ]);
                $thumbnailUrl = $thumbnailStored['public_url'];
            } catch (\Throwable) {
                // Keep the original remote thumbnail if the local copy fails.
            }
        }

        return [
            'type' => 'video',
            'provider' => 'freepik-stock',
            'title' => (string) data_get($detail, 'name', 'Freepik video'),
            'url' => $stored['public_url'],
            'thumbnail_url' => $thumbnailUrl,
            'width' => $this->numericOrNull(data_get($detail, 'thumbnails.0.width')),
            'height' => $this->numericOrNull(data_get($detail, 'thumbnails.0.height')),
            'duration_seconds' => $this->durationToSeconds((string) data_get($detail, 'duration', '')),
            'kind' => 'videos',
            'remote_id' => $assetId,
        ];
    }

    private function importIconPng(int $assetId): array
    {
        $download = $this->downloadIconAsset($assetId);

        return [
            'type' => 'image',
            'provider' => 'freepik-stock',
            'title' => (string) ($download['title'] ?? 'Freepik icon'),
            'url' => $download['public_url'],
            'thumbnail_url' => $download['public_url'],
            'width' => 512,
            'height' => 512,
            'kind' => 'icons',
            'remote_id' => $assetId,
        ];
    }

    private function downloadImageAsset(int $assetId): array
    {
        $detail = $this->detail('images', $assetId);
        $download = $this->authorizedGet($this->endpoint("/v1/resources/{$assetId}/download"), [
            'image_size' => 'original',
        ], 'Freepik resource download gagal');

        $data = $this->extractData($download, 'Freepik resource download gagal');
        $remoteUrl = trim((string) data_get($data, 'signed_url', data_get($data, 'url', '')));

        if ($remoteUrl === '') {
            throw new RuntimeException('Freepik resource download tidak mengembalikan URL file.');
        }

        $stored = $this->storeRemoteFile($remoteUrl, [
            'folder' => 'freepik_stock/downloads/images',
            'filename' => (string) data_get($data, 'filename', $this->slugFilename((string) data_get($detail, 'title', 'freepik-image'), $remoteUrl)),
        ]);

        return [
            ...$stored,
            'title' => (string) data_get($detail, 'title', 'Freepik image'),
            'kind' => 'images',
            'remote_id' => $assetId,
        ];
    }

    private function downloadVideoAsset(int $assetId): array
    {
        $detail = $this->detail('videos', $assetId);
        $download = $this->authorizedGet($this->endpoint("/v1/videos/{$assetId}/download"), [], 'Freepik video download gagal');
        $data = $this->extractData($download, 'Freepik video download gagal');
        $remoteUrl = trim((string) data_get($data, 'url', ''));

        if ($remoteUrl === '') {
            throw new RuntimeException('Freepik video download tidak mengembalikan URL file.');
        }

        $stored = $this->storeRemoteFile($remoteUrl, [
            'folder' => 'freepik_stock/downloads/videos',
            'filename' => (string) data_get($data, 'filename', $this->slugFilename((string) data_get($detail, 'name', 'freepik-video'), $remoteUrl)),
        ]);

        return [
            ...$stored,
            'title' => (string) data_get($detail, 'name', 'Freepik video'),
            'kind' => 'videos',
            'remote_id' => $assetId,
        ];
    }

    private function downloadIconAsset(int $assetId): array
    {
        $detail = $this->detail('icons', $assetId);
        $download = $this->authorizedGet($this->endpoint("/v1/icons/{$assetId}/download"), [
            'format' => 'png',
            'png_size' => 512,
        ], 'Freepik icon download gagal');
        $data = $this->extractData($download, 'Freepik icon download gagal');
        $remoteUrl = trim((string) data_get($data, 'url', ''));

        if ($remoteUrl === '') {
            throw new RuntimeException('Freepik icon download tidak mengembalikan URL file.');
        }

        $stored = $this->storeRemoteFile($remoteUrl, [
            'folder' => 'freepik_stock/downloads/icons',
            'filename' => (string) data_get($data, 'filename', $this->slugFilename((string) data_get($detail, 'name', 'freepik-icon'), $remoteUrl)),
        ]);

        return [
            ...$stored,
            'title' => (string) data_get($detail, 'name', 'Freepik icon'),
            'kind' => 'icons',
            'remote_id' => $assetId,
        ];
    }

    private function downloadMusicAsset(int $assetId): array
    {
        $detail = $this->detail('audio', $assetId);
        $remoteUrl = trim((string) data_get($detail, 'download_url', data_get($detail, 'file_url', '')));

        if ($remoteUrl === '') {
            throw new RuntimeException('Freepik music download URL tidak tersedia.');
        }

        $stored = $this->storeRemoteFile($remoteUrl, [
            'folder' => 'freepik_stock/downloads/audio',
            'filename' => $this->slugFilename((string) data_get($detail, 'title', 'freepik-audio'), $remoteUrl),
        ]);

        return [
            ...$stored,
            'title' => (string) data_get($detail, 'title', 'Freepik audio'),
            'kind' => 'audio',
            'remote_id' => $assetId,
        ];
    }

    private function detail(string $kind, int $assetId): array
    {
        return match ($this->normalizeKind($kind)) {
            'images' => $this->extractData(
                $this->authorizedGet($this->endpoint("/v1/resources/{$assetId}"), [], 'Freepik resource detail gagal'),
                'Freepik resource detail gagal'
            ),
            'videos' => $this->extractData(
                $this->authorizedGet($this->endpoint("/v1/videos/{$assetId}"), [], 'Freepik video detail gagal'),
                'Freepik video detail gagal'
            ),
            'icons' => $this->extractData(
                $this->authorizedGet($this->endpoint("/v1/icons/{$assetId}"), [], 'Freepik icon detail gagal'),
                'Freepik icon detail gagal'
            ),
            'audio' => $this->extractRawOrData(
                $this->authorizedGet($this->endpoint("/v1/music/{$assetId}"), [], 'Freepik music detail gagal'),
                'Freepik music detail gagal'
            ),
            default => throw new RuntimeException('Jenis asset tidak didukung.'),
        };
    }

    private function authorizedGet(string $url, array $query, string $prefix): Response
    {
        try {
            $response = $this->client()->get($url, $query);
        } catch (ConnectionException $e) {
            throw new RuntimeException($prefix.': koneksi ke Freepik sempat terputus (network reset/TLS). Coba ulangi beberapa detik lagi.');
        }

        if (! $response->successful()) {
            throw new RuntimeException($prefix.': '.$response->status().' - '.$this->responseError($response));
        }

        return $response;
    }

    private function client()
    {
        $apiKey = trim((string) config('services.freepik.api_key', ''));

        if ($apiKey === '') {
            throw new RuntimeException($this->missingApiKeyMessage());
        }

        return Http::connectTimeout(20)
            ->timeout(90)
            ->retry(3, 600, fn ($exception) => $exception instanceof ConnectionException, throw: false)
            ->acceptJson()
            ->withOptions([
                'force_ip_resolve' => 'v4',
            ])
            ->withHeaders([
                'x-freepik-api-key' => $apiKey,
                'User-Agent' => 'TeknoMedia/1.0 (+Laravel Freepik Client)',
            ]);
    }

    private function endpoint(string $path): string
    {
        return rtrim($this->apiOrigin(), '/').$path;
    }

    private function apiOrigin(): string
    {
        $configured = trim((string) config('services.freepik.base_url', 'https://api.freepik.com/v1/ai/text-to-image'));
        $scheme = parse_url($configured, PHP_URL_SCHEME) ?: 'https';
        $host = parse_url($configured, PHP_URL_HOST);
        $port = parse_url($configured, PHP_URL_PORT);

        if (! is_string($host) || $host === '') {
            return 'https://api.freepik.com';
        }

        return $scheme.'://'.$host.($port ? ':'.$port : '');
    }

    private function extractData(Response $response, string $prefix): array
    {
        $json = $response->json();
        $data = data_get($json, 'data', $json);

        if (! is_array($data)) {
            throw new RuntimeException($prefix.': format response Freepik tidak dikenali.');
        }

        return $data;
    }

    private function extractRawOrData(Response $response, string $prefix): array
    {
        $json = $response->json();
        $data = data_get($json, 'data', $json);

        if (! is_array($data)) {
            throw new RuntimeException($prefix.': format response Freepik tidak dikenali.');
        }

        return $data;
    }

    private function responseError(Response $response): string
    {
        $message = data_get($response->json(), 'message')
            ?? data_get($response->json(), 'error.message')
            ?? data_get($response->json(), 'detail')
            ?? $response->body();

        return Str::limit(trim((string) $message), 260);
    }

    private function storeRemoteFile(string $remoteUrl, array $options = []): array
    {
        $folder = trim((string) ($options['folder'] ?? 'freepik_stock/downloads'));
        $preferredName = trim((string) ($options['filename'] ?? ''));
        $tempPath = tempnam(sys_get_temp_dir(), 'fp_');

        if ($tempPath === false) {
            throw new RuntimeException('Gagal membuat file sementara untuk download Freepik.');
        }

        try {
            try {
                $response = Http::connectTimeout(20)
                    ->timeout(180)
                    ->retry(3, 600, fn ($exception) => $exception instanceof ConnectionException, throw: false)
                    ->withOptions([
                        'sink' => $tempPath,
                        'allow_redirects' => true,
                        'force_ip_resolve' => 'v4',
                    ])
                    ->withHeaders([
                        'User-Agent' => 'TeknoMedia/1.0 (+Laravel Freepik Client)',
                    ])
                    ->get($remoteUrl);
            } catch (ConnectionException $e) {
                throw new RuntimeException('Koneksi download asset Freepik sempat reset. Coba ulangi sekali lagi.');
            }

            if (! $response->successful()) {
                throw new RuntimeException('Gagal mengambil file dari Freepik download URL: '.$response->status());
            }

            $pathSource = $preferredName !== ''
                ? $preferredName
                : (parse_url($remoteUrl, PHP_URL_PATH) ?: '');
            $extension = strtolower(pathinfo($pathSource, PATHINFO_EXTENSION));
            if ($extension === '') {
                $extension = $this->extensionFromMime((string) $response->header('Content-Type'));
            }

            $baseName = $preferredName !== ''
                ? pathinfo($preferredName, PATHINFO_FILENAME)
                : 'freepik_'.Str::lower(Str::random(10));

            $safeFilename = Str::slug($baseName);
            if ($safeFilename === '') {
                $safeFilename = 'freepik_'.Str::lower(Str::random(10));
            }

            $finalFilename = $safeFilename.($extension !== '' ? '.'.$extension : '');
            $relativePath = trim($folder, '/').'/'.now()->format('Ymd_His').'_'.$finalFilename;

            $stream = fopen($tempPath, 'rb');
            if ($stream === false) {
                throw new RuntimeException('Gagal membaca file sementara Freepik.');
            }

            Storage::disk('public')->writeStream($relativePath, $stream);

            if (is_resource($stream)) {
                fclose($stream);
            }

            return [
                'relative_path' => $relativePath,
                'public_url' => Storage::url($relativePath),
                'url' => Storage::url($relativePath),
                'path' => Storage::disk('public')->path($relativePath),
                'filename' => $finalFilename,
                'mime' => (string) $response->header('Content-Type', 'application/octet-stream'),
            ];
        } finally {
            if (is_file($tempPath)) {
                @unlink($tempPath);
            }
        }
    }

    private function slugFilename(string $title, string $remoteUrl): string
    {
        $baseName = Str::slug($title);
        if ($baseName === '') {
            $baseName = 'freepik_'.Str::lower(Str::random(10));
        }

        $extension = strtolower(pathinfo(parse_url($remoteUrl, PHP_URL_PATH) ?: $remoteUrl, PATHINFO_EXTENSION));

        return $baseName.($extension !== '' ? '.'.$extension : '');
    }

    private function extensionFromMime(string $mime): string
    {
        return match (Str::before($mime, ';')) {
            'image/jpeg' => 'jpg',
            'image/png' => 'png',
            'image/webp' => 'webp',
            'image/svg+xml' => 'svg',
            'video/mp4' => 'mp4',
            'audio/mpeg' => 'mp3',
            'audio/mp3' => 'mp3',
            'audio/wav' => 'wav',
            'application/zip' => 'zip',
            default => '',
        };
    }

    private function normalizeKind(string $kind): string
    {
        return match ($kind) {
            'image', 'images', 'resource', 'resources' => 'images',
            'video', 'videos' => 'videos',
            'icon', 'icons' => 'icons',
            'audio', 'music' => 'audio',
            default => 'unknown',
        };
    }

    private function numericOrNull(mixed $value): ?int
    {
        return is_numeric($value) ? (int) $value : null;
    }

    private function durationToSeconds(string $duration): ?int
    {
        $parts = array_map('intval', explode(':', $duration));

        if (count($parts) === 3) {
            return ($parts[0] * 3600) + ($parts[1] * 60) + $parts[2];
        }

        if (count($parts) === 2) {
            return ($parts[0] * 60) + $parts[1];
        }

        return null;
    }

    private function missingApiKeyMessage(): string
    {
        $value = strtolower(trim((string) (
            config('services.huggingface.hf_only')
            ?? $_ENV['TOOLS_HF_ONLY']
            ?? $_SERVER['TOOLS_HF_ONLY']
            ?? getenv('TOOLS_HF_ONLY')
            ?? 'false'
        )));

        if (in_array($value, ['1', 'true', 'yes', 'on'], true)) {
            return 'Fitur stock import/download dimatikan di mode Hugging Face-only.';
        }

        return 'FREEPIK_API_KEY belum diisi di file .env';
    }
}