<?php
namespace app\service;

use app\service\AIGatewayService;
use think\Db;
use think\Exception;
use think\Queue;

/**
 * ImageService 图像任务服务
 * 负责图生文、文生文、文生图、图生图等 AI 任务的队列派发与状态管理
 */
class ImageService
{
    /** 队列名称 */
    private const QUEUE_ARRIMAGE = 'arrimage';

    /** Redis 任务状态 TTL（秒） */
    private const TASK_TTL = 300;

    /** Redis key 前缀 */
    private const KEY_TEXT_TO_IMAGE = 'text_to_image_task:';
    private const KEY_IMG_TO_IMG = 'img_to_img_task:';

    /**
     * 图生文：提交到队列
     * @param array $params 请求参数
     * @return bool
     */
    public function handleImgToText(array $params): bool
    {
        Queue::push('app\job\ImageArrJob', $params, self::QUEUE_ARRIMAGE);
        return true;
    }

    /**
     * 文生文：直接调用 API 并返回结果
     * @param string $prompt 提示词
     * @param string $model 模型名称
     * @return array ['success'=>bool, 'message'=>string, 'data'=>string]
     */
    public function handleTextToText($status_val, string $prompt, string $model): array
    {
        $ai = new AIGatewayService();
        $gptRes = $ai->buildRequestData($status_val, $model, $prompt);


        $gptText = '';
        if (isset($gptRes['candidates'][0]['content']['parts'][0]['text'])) {
            $gptText = $gptRes['candidates'][0]['content']['parts'][0]['text'];
        } elseif (isset($gptRes['choices'][0]['message']['content'])) {
            $gptText = trim($gptRes['choices'][0]['message']['content']);
        }
        if (isset($gptRes['error']) || isset($gptRes['code']) && $gptRes['code'] !== 0) {
            return [
                'success' => false,
                'message' => $gptRes['msg'] ?? $gptRes['error']['message'] ?? '生成失败',
                'data' => ''
            ];
        }
        return [
            'success' => true,
            'message' => '生成成功',
            'data' => $gptText
        ];
    }

    /**
     * 文生图：创建任务并推送到队列
     * @param array $params 含 id、model 等
     * @return array ['success'=>bool, 'message'=>string, 'task_id'=>string]
     */
    public function handleTextToImg(array $params): array
    {
        return $this->submitTaskToQueue(
            $params,
            self::KEY_TEXT_TO_IMAGE,
            '正在生成图片中，请稍等.....'
        );
    }

    /**
     * 图生图：创建任务并推送到队列（产品图+模板图）
     * @param array $params 含 id、product_img、template_img、prompt、model 等
     * @return array ['success'=>bool, 'message'=>string, 'task_id'=>string]
     */
    public function handleImgToImg(array $params): array
    {
        return $this->submitTaskToQueue(
            $params,
            self::KEY_IMG_TO_IMG,
            '正在生成图片中，请稍等.....'
        );
    }

    /**
     * 通用：创建任务 ID、写入 Redis、推送到队列
     */
    private function submitTaskToQueue(array $params, string $redisKeyPrefix, string $message): array
    {
        $taskId = ($params['id'] ?? '0') . '-' . date('YmdHis') . '-' . mt_rand(1000, 9999);
        $params['task_id'] = $taskId;

        $redis = getTaskRedis();
        $redis->set($redisKeyPrefix . $taskId, json_encode([
            'status' => 'pending',
            'created_at' => date('Y-m-d H:i:s')
        ]), ['EX' => self::TASK_TTL]);

        Queue::push('app\job\ImageArrJob', $params, self::QUEUE_ARRIMAGE);

        return [
            'success' => true,
            'message' => $message,
            'task_id' => $taskId
        ];
    }

    /**
     * 批量图像任务：支持链式任务和单类型任务
     * @param array $params 含 batch、num、type、old_image_file 等
     * @return bool
     */
    public function handleImage(array $params): bool
    {
        if (!isset($params['batch']) || !is_array($params['batch'])) {
            return false;
        }

        $arr = $this->buildBatchItems($params);
        $insertData = $this->buildQueueLogData($params, count($arr));

        if (empty($params['type'])) {
            $this->dispatchFullChainTask($arr, $insertData);
        } else {
            $result = $this->dispatchSingleTypeTask($arr, $params, $insertData);
            if (!$result) {
                return false;
            }
        }
        return true;
    }

    /** 构建批量任务项 */
    private function buildBatchItems(array $params): array
    {
        $arr = [];
        foreach ($params['batch'] as $v) {
            $baseItem = [
                'sourceDir' => $this->sourceDir($v, 1),
                'outputDir' => $this->sourceDir($v, 2),
                'file_name' => $this->sourceDir($v, 3),
                'type' => $params['type'] ?? '',
                'selectedOption' => $params['selectedOption'] ?? '',
                'txttotxt_selectedOption' => $params['txttotxt_selectedOption'] ?? '',
                'imgtotxt_selectedOption' => $params['imgtotxt_selectedOption'] ?? '',
                'prompt' => '',
                'width' => $params['width'] ?? 0,
                'height' => $params['height'] ?? 0,
                'executeKeywords' => $params['executeKeywords'] ?? '',
                'sys_id' => $params['sys_id'] ?? ''
            ];
            $num = (int)($params['num'] ?? 1);
            $arr = array_merge($arr, array_fill(0, max(1, $num), $baseItem));
        }
        return $arr;
    }

    /** 构建队列日志插入数据 */
    private function buildQueueLogData(array $params, int $imageCount): array
    {
        return [
            'create_time' => date('Y-m-d H:i:s'),
            'old_image_file' => $params['old_image_file'] ?? '',
            'status' => '等待中',
            'image_count' => $imageCount,
            'params' => json_encode($params, JSON_UNESCAPED_UNICODE)
        ];
    }

    /** 派发一键链式任务：图生文→文生文→文生图→图生图→高清放大 */
    private function dispatchFullChainTask(array $arr, array $insertData): void
    {
        $params = json_decode($insertData['params'], true) ?: [];
        $insertData['model'] = 'gpt-4-vision-preview,gpt-4,' . ($params['selectedOption'] ?? '');
        $insertData['model_name'] = '文生图';

        $taskId = Db::name('queue_logs')->insertGetId($insertData);
        $arr = array_map(function ($item) use ($taskId) {
            $item['type'] = '图生文';
            $item['chain_next'] = ['文生文', '文生图', '图生图', '高清放大'];
            $item['task_id'] = $taskId;
            return $item;
        }, $arr);

        Queue::push('app\job\ImageArrJob', ['task_id' => $taskId, 'data' => $arr], self::QUEUE_ARRIMAGE);
    }

    /** 派发单类型任务 */
    private function dispatchSingleTypeTask(array $arr, array $params, array $insertData): bool
    {
        $typeConfig = $this->getTypeConfig($params['type'], $params);
        if (!$typeConfig) {
            return false;
        }

        $insertData['model'] = $typeConfig['model'];
        $insertData['model_name'] = $typeConfig['model_name'];

        $taskId = Db::name('queue_logs')->insertGetId($insertData);
        $arr = array_map(function ($item) use ($params, $taskId) {
            $item['type'] = $params['type'];
            $item['task_id'] = $taskId;
            return $item;
        }, $arr);

        Queue::push('app\job\ImageArrJob', ['task_id' => $taskId, 'data' => $arr], self::QUEUE_ARRIMAGE);
        return true;
    }

    /** 任务类型对应的 model 配置 */
    private function getTypeConfig(string $type, array $params = []): ?array
    {
        $configs = [
            '图生文' => ['model' => 'gpt-4-vision-preview', 'model_name' => '图生文'],
            '文生文' => ['model_key' => 'txttotxt_selectedOption', 'model_name' => '文生文'],
            '文生图' => ['model_key' => 'selectedOption', 'model_name' => '文生图'],
            '图生图' => ['model' => 'realisticVisionV51_v51VAE-inpainting.safetensors [f0d4872d24]', 'model_name' => '图生图'],
            '高清放大' => ['model' => '高清放大', 'model_name' => '高清放大']
        ];

        $cfg = $configs[$type] ?? null;
        if (!$cfg) {
            return null;
        }
        if (isset($cfg['model_key'])) {
            $cfg['model'] = $params[$cfg['model_key']] ?? '';
            unset($cfg['model_key']);
        }
        return $cfg;
    }

    /**
     * 解析图像路径
     * @param string $filePath 如 uploads/operate/ai/Preview/20240610/xxx.png
     * @param int $type 1=源目录 2=输出目录 3=文件名
     * @return string|null
     */
    public function sourceDir(string $filePath, int $type): ?string
    {
        $pathParts = explode('/', $filePath);
        $filename = array_pop($pathParts);
        $baseParts = $pathParts;
        $date = '';

        foreach ($pathParts as $index => $part) {
            if (preg_match('/^\d{8}$/', $part)) {
                $date = $part;
                unset($baseParts[$index]);
                break;
            }
        }

        $basePath = implode('/', $baseParts);

        switch ($type) {
            case 1:
                return $basePath;
            case 2:
                return '/' . str_replace('/Preview/', '/dall-e/', $basePath) . $date;
            case 3:
                return $filename;
            default:
                return null;
        }
    }
}