import { NextRequest, NextResponse } from "next/server";
import {
  createMediaAssetRelation,
  getMediaAssetsByUserAndUrls,
  getSystemSetting,
  upsertMediaAsset,
} from "@/lib/db/queries";
import { auth } from "@/app/(auth)/auth";
import { uploadFile } from "@/lib/storage/service";
import { db } from "@/lib/db";
import { generatedImage } from "@/lib/db/schema";

// 角度编辑API配置类型
type AngleEditConfig = {
  enabled?: boolean;
  falApiKey?: string;
  loraScale?: number;
  inferenceSteps?: number;
  guidanceScale?: number;
  maxImageSize?: number;
  timeout?: number;
};

// 设置API路由最大执行时间为3分钟（180秒）
export const maxDuration = 180;

/**
 * 压缩图片生成缩略图
 */
async function createThumbnail(buffer: Buffer): Promise<Buffer> {
  try {
    const sharp = await import("sharp");
    
    const thumbnailBuffer = await sharp.default(buffer)
      .resize(500, null, {
        fit: "inside",
        withoutEnlargement: true,
      })
      .jpeg({ quality: 80 })
      .toBuffer();
    
    console.log(`[Angle-Edit] Thumbnail created, size: ${thumbnailBuffer.length} bytes (original: ${buffer.length} bytes)`);
    return thumbnailBuffer;
  } catch (error) {
    console.error("[Angle-Edit] Failed to create thumbnail:", error);
    return buffer;
  }
}

/**
 * 将 base64 图片上传到 S3
 */
async function uploadBase64ToS3(base64Data: string, prefix: string = "angle-edit"): Promise<{ thumbnail: string; original: string }> {
  try {
    const buffer = Buffer.from(base64Data, "base64");
    const timestamp = Date.now();
    const randomStr = Math.random().toString(36).slice(2, 8);
    const thumbnailFilename = `${prefix}-thumb-${timestamp}-${randomStr}.png`;
    const originalFilename = `${prefix}-orig-${timestamp}-${randomStr}.png`;
    
    console.log(`[Angle-Edit] Original size: ${buffer.length} bytes`);
    
    const thumbnailBuffer = await createThumbnail(buffer);
    
    const thumbnailArrayBuffer = thumbnailBuffer.buffer.slice(
      thumbnailBuffer.byteOffset, 
      thumbnailBuffer.byteOffset + thumbnailBuffer.byteLength
    ) as ArrayBuffer;
    const originalArrayBuffer = buffer.buffer.slice(
      buffer.byteOffset, 
      buffer.byteOffset + buffer.byteLength
    ) as ArrayBuffer;
    
    console.log(`[Angle-Edit] Uploading thumbnail and original to S3...`);
    const [thumbnailResult, originalResult] = await Promise.all([
      uploadFile(thumbnailFilename, thumbnailArrayBuffer),
      uploadFile(originalFilename, originalArrayBuffer),
    ]);
    
    console.log(`[Angle-Edit] Uploaded to S3:`);
    console.log(`  - Thumbnail: ${thumbnailResult.url}`);
    console.log(`  - Original: ${originalResult.url}`);
    
    return {
      thumbnail: thumbnailResult.url,
      original: originalResult.url,
    };
  } catch (error) {
    console.error("[Angle-Edit] Failed to upload to S3:", error);
    throw new Error(`图片上传失败: ${error instanceof Error ? error.message : "未知错误"}`);
  }
}

export async function POST(request: NextRequest) {
  const startTime = Date.now();
  
  try {
    // 1. 验证用户登录
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ error: "未登录" }, { status: 401 });
    }

    console.log("[Angle-Edit] ===== 收到请求 =====");
    console.log("[Angle-Edit] 用户ID:", session.user.id);

    // 2. 从数据库获取配置
    const angleEditConfig = await getSystemSetting({ key: "angle_edit_config" });
    const config = (angleEditConfig?.value as AngleEditConfig) || {};

    // 验证功能是否启用
    if (!config.enabled) {
      return NextResponse.json(
        { error: "角度编辑功能未启用，请联系管理员在系统设置中开启" },
        { status: 400 }
      );
    }

    // 验证 API Key
    if (!config.falApiKey) {
      return NextResponse.json(
        { error: "fal.ai API Key 未配置，请联系管理员配置" },
        { status: 500 }
      );
    }

    console.log("[Angle-Edit] 配置加载成功，LoRA强度:", config.loraScale || 1);

    // 3. 解析请求
    const body = await request.json();
    const {
      image_url,
      image_base64,
      // 数值参数 (官方 API 格式)
      horizontal_angle,  // 0-360 度
      vertical_angle,    // -30 到 90 度
      zoom,              // 0-10
      lora_scale,
    } = body;

    if (!image_url && !image_base64) {
      return NextResponse.json({ error: "缺少图片数据" }, { status: 400 });
    }

    // 使用请求中的参数或配置中的默认值
    const finalLoraScale = lora_scale ?? config.loraScale ?? 1;
    const finalHorizontalAngle = horizontal_angle ?? 0;
    const finalVerticalAngle = vertical_angle ?? 0;
    const finalZoom = zoom ?? 5;

    console.log("[Angle-Edit] 角度参数:");
    console.log(`  - 水平角度: ${finalHorizontalAngle}°`);
    console.log(`  - 垂直角度: ${finalVerticalAngle}°`);
    console.log(`  - 缩放: ${finalZoom}`);
    console.log(`  - LoRA强度: ${finalLoraScale}`);

    // 4. 准备图片输入
    let imageInput: string;
    if (image_url) {
      imageInput = image_url;
    } else {
      const mimeType = image_base64.startsWith("/9j/") ? "image/jpeg" : "image/png";
      imageInput = `data:${mimeType};base64,${image_base64}`;
    }

    // 5. 动态导入 fal.ai SDK 并调用官方多角度 API
    console.log("[Angle-Edit] 调用 fal.ai API (qwen-image-edit-2511-multiple-angles)...");
    
    const fal = await import("@fal-ai/serverless-client");
    
    fal.config({
      credentials: config.falApiKey,
    });

    // 使用官方多角度 API 端点
    // 文档: https://fal.ai/models/fal-ai/qwen-image-edit-2511-multiple-angles
    const result = await fal.subscribe("fal-ai/qwen-image-edit-2511-multiple-angles", {
      input: {
        image_urls: [imageInput],  // 官方使用 image_urls (数组)
        horizontal_angle: finalHorizontalAngle,  // 水平旋转角度 0-360
        vertical_angle: finalVerticalAngle,      // 垂直角度 -30 到 90
        zoom: finalZoom,                         // 缩放 0-10
        lora_scale: finalLoraScale,              // LoRA 强度
        num_inference_steps: config.inferenceSteps || 28,
        guidance_scale: config.guidanceScale || 4.5,  // 官方默认 4.5
        enable_safety_checker: true,
        output_format: "png",
      },
      logs: true,
      onQueueUpdate: (update) => {
        if (update.status === "IN_PROGRESS") {
          console.log("[Angle-Edit] 处理进度...");
        }
      },
    });

    // 6. 处理结果
    const apiResult = result as { images?: Array<{ url?: string }>; prompt?: string };
    const outputImage = apiResult.images?.[0];
    if (!outputImage?.url) {
      throw new Error("API 未返回有效图片");
    }

    const outputImageUrl = outputImage.url;
    console.log("[Angle-Edit] 输出图片URL:", outputImageUrl);
    console.log("[Angle-Edit] API 构建的提示词:", apiResult.prompt);

    // 7. 下载图片并上传到我们的 S3
    const imageResponse = await fetch(outputImageUrl);
    if (!imageResponse.ok) {
      throw new Error(`下载输出图片失败: ${imageResponse.status}`);
    }
    const imageBuffer = Buffer.from(await imageResponse.arrayBuffer());
    const imageBase64Result = imageBuffer.toString("base64");

    const s3Result = await uploadBase64ToS3(imageBase64Result, "angle-edit");
    console.log("[Angle-Edit] 已上传到S3:", s3Result.original);

    // 8. 保存到数据库
    const processingTime = (Date.now() - startTime) / 1000;
    
    const [savedImage] = await db.insert(generatedImage).values({
      userId: session.user.id,
      thumbnailUrl: s3Result.thumbnail,
      originalUrl: s3Result.original,
      prompt: `角度编辑: H${finalHorizontalAngle}° V${finalVerticalAngle}° Z${finalZoom}`,
      modelId: "qwen-image-edit-2511-multiple-angles",
      createdAt: new Date(),
    }).returning();

    try {
      const sourceAssets =
        typeof image_url === "string" && image_url.trim()
          ? await getMediaAssetsByUserAndUrls({
              userId: session.user.id,
              urls: [image_url],
            })
          : [];
      const media = await upsertMediaAsset({
        userId: session.user.id,
        mediaType: "image",
        sourceType: "edited",
        status: "ready",
        originalUrl: s3Result.original,
        previewUrl: s3Result.original,
        thumbnailUrl: s3Result.thumbnail,
        displayName: `角度编辑 ${finalHorizontalAngle}/${finalVerticalAngle}`.slice(0, 80),
        prompt: `角度编辑: H${finalHorizontalAngle}° V${finalVerticalAngle}° Z${finalZoom}`,
        modelId: "qwen-image-edit-2511-multiple-angles",
        sourceTable: "GeneratedImage",
        sourceRowId: savedImage.id,
        primaryParentAssetId: sourceAssets[0]?.id ?? null,
        metadata: {
          horizontalAngle: finalHorizontalAngle,
          verticalAngle: finalVerticalAngle,
          zoom: finalZoom,
        },
      });
      if (media) {
        for (const sourceAsset of sourceAssets) {
          await createMediaAssetRelation({
            userId: session.user.id,
            fromAssetId: sourceAsset.id,
            toAssetId: media.id,
            relationType: "edited_from",
            metadata: {
              horizontalAngle: finalHorizontalAngle,
              verticalAngle: finalVerticalAngle,
              zoom: finalZoom,
            },
          });
        }
      }
    } catch (assetError) {
      console.error("[Angle-Edit] ⚠️ MediaAsset 注册失败:", assetError);
    }

    console.log("[Angle-Edit] ✅ 处理完成，耗时:", processingTime.toFixed(2), "秒");

    // 9. 返回结果
    return NextResponse.json({
      success: true,
      image_url: s3Result.original,
      thumbnail_url: s3Result.thumbnail,
      image_base64: imageBase64Result,
      processing_time: processingTime,
      angles: {
        horizontal_angle: finalHorizontalAngle,
        vertical_angle: finalVerticalAngle,
        zoom: finalZoom,
      },
      prompt: apiResult.prompt,
    });

  } catch (error) {
    console.error("[Angle-Edit] ❌ 错误:", error);
    
    // 输出详细的错误信息
    if (error && typeof error === "object" && "status" in error) {
      const apiError = error as { status?: number; body?: unknown; message?: string };
      console.error("[Angle-Edit] API 错误详情:");
      console.error("  - Status:", apiError.status);
      console.error("  - Body:", JSON.stringify(apiError.body, null, 2));
      console.error("  - Message:", apiError.message);
      
      if (apiError.status === 403) {
        return NextResponse.json(
          { 
            error: "API 访问被拒绝 (403 Forbidden)。请检查 API Key 是否正确，以及是否有权限访问该模型。",
            details: apiError.body,
          },
          { status: 403 }
        );
      }
    }
    
    return NextResponse.json(
      { 
        error: error instanceof Error ? error.message : "角度编辑处理失败",
      },
      { status: 500 }
    );
  }
}