<?php

namespace App\Http\Controllers\AIGeneration;

use Illuminate\Routing\Controller as BaseController;
use App\Libs\Utils;
use App\Services\AIGeneration\AIImageGenerationService;
use App\Transformer\AIGeneration\AIGenerationTransformer;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Facades\Validator;
use App\Libs\ApiResponse;

class ImageGenerationController extends BaseController
{
    use ApiResponse;
    private $aiImageGenerationService;

    public function __construct(
        AIImageGenerationService $aiImageGenerationService
    ) {
        $this->aiImageGenerationService = $aiImageGenerationService;
    }

    /**
     * 创建图片生成任务
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function createTask(Request $request): JsonResponse
    {
        $data = $request->all();

        // 首先验证基本参数
        $baseRules = [
            'prompt' => 'required|string|max:2000',
            'width' => 'required|numeric|between:1024,4096',
            'height' => 'required|numeric|between:1024,4096',
            'image_num' => 'required|numeric|between:1,4',
            'scale' => 'required|numeric|between:0,100',
        ];

        $baseMessages = [
            'prompt.required' => '提示词不能为空',
            'prompt.max' => '提示词不能超过2000个字符',
            'width.required' => '宽不能为空',
            'width.numeric' => '宽必须是数字',
            'width.between' => '宽必须在1024到4096之间',
            'height.required' => '高不能为空',
            'height.numeric' => '高必须是数字',
            'height.between' => '高必须在1024到4096之间',
            'image_num.required' => '生成图片数量不能为空',
            'image_num.numeric' => '生成图片数量必须是数字',
            'image_num.between' => '生成图片数量必须在1到4之间',
            'scale.required' => '缩放比例不能为空',
            'scale.numeric' => '缩放比例必须是数字',
            'scale.between' => '缩放比例必须在0到100之间',
        ];

        // 根据传入参数决定验证规则
        if (isset($data['ref_img_url'])) {
            // URL 方式 - 支持单个或多个URL（逗号分隔或数组）
            $validationRules = array_merge($baseRules, [
                'ref_img_url' => 'required',
            ]);
            
            $validationMessages = array_merge($baseMessages, [
                'ref_img_url.required' => '参考图片URL不能为空',
            ]);
        } else {
            // 上传文件方式 - 支持多个文件
            $validationRules = array_merge($baseRules, [
                'ref_img_file' => 'required',
                'ref_img_file.*' => 'image|mimes:jpeg,png|max:4800',
            ]);
            
            $validationMessages = array_merge($baseMessages, [
                'ref_img_file.required' => '参考图片不能为空',
                'ref_img_file.*.image' => '参考图片必须是图片文件',
                'ref_img_file.*.mimes' => '参考图片必须是jpeg,png格式',
                'ref_img_file.*.max' => '参考图片大小不能超过4.7MB',
            ]);
        }
        
        $validator = Validator::make($data, $validationRules, $validationMessages);
        
        if ($validator->fails()) {
            Utils::throwError('1002:'.$validator->errors()->first());
        }

        $refImgUrls = [];
        $refImgBase64List = [];

        // 处理上传的图片
        if ($request->hasFile('ref_img_file')) {
            $refImgFiles = is_array($request->file('ref_img_file')) 
                ? $request->file('ref_img_file') 
                : [$request->file('ref_img_file')];
            
            foreach ($refImgFiles as $index => $refImgFile) {
                // 验证图片分辨率和比例
                $refImgInfo = @getimagesize($refImgFile->getPathname());    
                
                if (!$refImgInfo) {
                    Utils::throwError('1003:图片' . ($index + 1) . '格式无效');
                }
                
                $refImg = [
                    'width' => $refImgInfo[0],
                    'height' => $refImgInfo[1],
                    'size' => $refImgFile->getSize(),
                ];
                
                // 验证图片规格
                $this->validateImageSpecs($refImg, $index + 1);
                
                // 上传图片到服务器并获取URL
                $filename = randStr(10) . '.' . $refImgFile->getClientOriginalExtension();
                $uploaded_url = uploadStreamByTos('image', file_get_contents($refImgFile->getPathname()), $filename);
                if (!$uploaded_url) {
                    Utils::throwError('1003:图片' . ($index + 1) . '保存失败');
                }
                $refImgUrls[] = $uploaded_url;
            }

        } else {
            // 使用URL方式，支持逗号分隔的字符串或数组
            $urls = is_array($data['ref_img_url']) 
                ? $data['ref_img_url'] 
                : array_map('trim', explode(',', $data['ref_img_url']));
            
            foreach ($urls as $index => $url) {
                if (empty($url)) {
                    continue;
                }
                
                // 验证URL格式
                if (!filter_var($url, FILTER_VALIDATE_URL)) {
                    Utils::throwError('1003:图片URL' . ($index + 1) . '格式无效');
                }
                
                // 验证远程图片
                $refImg = Utils::getRemoteImageInfo($url, true);
                if (!$refImg) {
                    Utils::throwError('1003:图片' . ($index + 1) . '获取失败');
                }
                
                // 验证图片规格
                $this->validateImageSpecs($refImg, $index + 1);
                
                $refImgUrls[] = $url;
            }
        }
        
        if (empty($refImgUrls)) {
            Utils::throwError('1003:至少需要一张参考图片');
        }
        
        // 将处理后的URL存入data（支持多个）
        $data['ref_img_urls'] = $refImgUrls;
        $data['ref_img_url'] = $refImgUrls[0]; // 保持向后兼容

        try {
            $task = $this->aiImageGenerationService->createImageGenerationTask($data);

            return $this->success(['task_id' => $task->task_id, 'status' => $task->status]);
        } catch (\Exception $e) {
            Utils::throwError('1001:'.$e->getMessage());
        }
    }

    /**
     * 验证图片规格
     * 
     * @param array $refImg
     * @param int $index
     * @return void
     */
    private function validateImageSpecs(array $refImg, int $index): void
    {
        // 判断图片是否满足以下条件:
        // 1.图片文件最大4.7MB
        // 2.图片分辨率最大: 4096*4096, 最短边不低于320
        // 3.图片长边与短边比例在3以内
        if ($refImg['size'] > 4.7 * 1024 * 1024) {
            Utils::throwError('1003:图片' . $index . '大小不能超过4.7MB');
        }
        
        $minDimension = min($refImg['width'], $refImg['height']);
        $maxDimension = max($refImg['width'], $refImg['height']);
        
        if ($maxDimension > 4096 || $minDimension < 320) {
            Utils::throwError('1003:图片' . $index . '分辨率不能超过4096*4096，且最短边不能低于320');
        }
        
        if ($maxDimension / $minDimension > 3) {
            Utils::throwError('1003:图片' . $index . '长边与短边比例不能超过3');
        }
    }

    /**
     * 查询任务状态
     *
     * @param string $taskId
     * @return JsonResponse
     */
    public function taskStatus(string $taskId): JsonResponse
    {
        $task = \App\Models\MpGeneratePicTask::where('task_id', $taskId)->first();

        if (!$task) {
            return response()->json([
                'success' => false,
                'message' => '任务不存在'
            ], 404);
        }

        return response()->json([
            'success' => true,
            'data' => [
                'task_id' => $task->task_id,
                'status' => $task->status,
                'result_url' => $task->result_url,
                'error_message' => $task->error_message,
                'created_at' => $task->created_at,
                'started_at' => $task->started_at,
                'completed_at' => $task->completed_at
            ]
        ]);
    }

    /**
     * 获取任务列表
     *
     * @param Request $request
     * @return mixed
     */
    public function taskList(Request $request)
    {
        $data = $request->all();

        $result = $this->aiImageGenerationService->getTaskList($data);
        return $this->success($result, [new AIGenerationTransformer(), 'newBuildTaskList']);
    }

    /**
     * 批量上传图片
     *
     * @param Request $request
     * @return void
     */
    public function batchUploadImg(Request $request) {
        $refImgUrls = [];
        // 处理上传的图片
        if ($request->hasFile('ref_img_file')) {
            $refImgFiles = is_array($request->file('ref_img_file')) 
                ? $request->file('ref_img_file') 
                : [$request->file('ref_img_file')];
            
            foreach ($refImgFiles as $index => $refImgFile) {
                // 验证图片分辨率和比例
                $refImgInfo = @getimagesize($refImgFile->getPathname());
                
                if (!$refImgInfo) {
                    Utils::throwError('1003:图片' . ($index + 1) . '格式无效');
                }
                
                $refImg = [
                    'width' => $refImgInfo[0],
                    'height' => $refImgInfo[1],
                    'size' => $refImgFile->getSize(),
                ];
                
                // 验证图片规格
                $this->validateImageSpecs($refImg, $index + 1);
                
                // 上传图片到服务器并获取URL
                $filename = randStr(10) . '.' . $refImgFile->getClientOriginalExtension();
                $uploaded_url = uploadStreamByTos('image', file_get_contents($refImgFile->getPathname()), $filename);
                if (!$uploaded_url) {
                    Utils::throwError('1003:图片' . ($index + 1) . '保存失败');
                }
                $refImgUrls[] = $uploaded_url;
            }

        }

        return $this->success(['image_urls' => $refImgUrls]);
    }
}