<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use RuntimeException;

class OpenAiImageService
{
    public function __construct(private ?HuggingFaceMediaStorageService $hfMediaStorage = null)
    {
    }

    public function generate(string $prompt, string $aspect = 'landscape', int $count = 1): array
    {
        $apiKey = $this->resolveApiKey();
        $baseUrl = rtrim((string) config('services.openai.base_url', 'https://api.openai.com/v1'), '/');
        $model = (string) config('services.openai.image_model', 'gpt-image-1.5');
        $timeout = max(20, (int) config('services.openai.image_timeout', 120));

        if (trim($apiKey) === '') {
            throw new RuntimeException('OPENAI_API_KEY belum diisi di file .env');
        }

        $count = in_array($count, [1, 2, 4, 6], true) ? $count : 1;
        $size = $this->sizeFromAspect($aspect);

        $response = Http::timeout($timeout)
            ->withToken($apiKey)
            ->acceptJson()
            ->post("{$baseUrl}/images/generations", [
                'model' => $model,
                'prompt' => $prompt,
                'size' => $size,
                'n' => $count,
            ]);

        if (! $response->successful()) {
            $errorBody = trim((string) data_get($response->json(), 'error.message', $response->body()));

            if ($response->status() === 403) {
                throw new RuntimeException(
                    'OpenAI image belum diizinkan untuk project ini. Cek project permissions atau Organization Verification. Detail: '.$errorBody
                );
            }

            throw new RuntimeException('OpenAI image request gagal: '.$response->status().' - '.$errorBody);
        }

        $items = data_get($response->json(), 'data', []);
        if (! is_array($items) || count($items) === 0) {
            throw new RuntimeException('OpenAI image response kosong.');
        }

        $urls = [];
        foreach ($items as $item) {
            $url = data_get($item, 'url');
            if (is_string($url) && trim($url) !== '') {
                $urls[] = trim($url);
                continue;
            }

            $b64 = data_get($item, 'b64_json');
            if (! is_string($b64) || trim($b64) === '') {
                continue;
            }

            $binary = base64_decode($b64, true);
            if ($binary === false) {
                continue;
            }

            $filename = 'img_'.now()->format('Ymd_His').'_'.Str::lower(Str::random(8)).'.png';
            $path = 'images/'.$filename;
            Storage::disk('public')->put($path, $binary);
            $urls[] = $this->offloadPublicPath($path);
        }

        if (count($urls) === 0) {
            throw new RuntimeException('Gagal membaca output gambar dari OpenAI.');
        }

        return $urls;
    }

    private function sizeFromAspect(string $aspect): string
    {
        return match ($aspect) {
            'portrait' => '1024x1536',
            'square' => '1024x1024',
            default => '1536x1024',
        };
    }

    private function resolveApiKey(): string
    {
        $primaryKey = trim((string) config('services.openai.api_key'));
        $fallbackKey = trim((string) config('services.openai.chat_api_key'));

        if ($primaryKey !== '' && ! $this->looksLikePlaceholderKey($primaryKey)) {
            return $primaryKey;
        }

        return $fallbackKey !== '' ? $fallbackKey : $primaryKey;
    }

    private function looksLikePlaceholderKey(string $value): bool
    {
        $normalized = strtoupper(trim($value));

        return str_starts_with($normalized, 'GANTI_')
            || str_contains($normalized, 'YOUR_')
            || str_contains($normalized, 'PLACEHOLDER');
    }

    private function offloadPublicPath(string $relativePath): string
    {
        try {
            return $this->hfMedia()->offloadPublicRelativePath($relativePath);
        } catch (\Throwable) {
            return Storage::url($relativePath);
        }
    }

    private function hfMedia(): HuggingFaceMediaStorageService
    {
        if ($this->hfMediaStorage instanceof HuggingFaceMediaStorageService) {
            return $this->hfMediaStorage;
        }

        $service = app(HuggingFaceMediaStorageService::class);
        if (! $service instanceof HuggingFaceMediaStorageService) {
            throw new RuntimeException('Service HuggingFaceMediaStorageService tidak tersedia.');
        }

        $this->hfMediaStorage = $service;

        return $this->hfMediaStorage;
    }
}