import { type NextRequest, NextResponse } from "next/server";
import { auth } from "@/app/(auth)/auth";
import { ExtendServiceError, executeExtendJob } from "@/lib/ai/extend/service";
import { getPointsSystemConfig } from "@/lib/db/queries";
import { prepareFeaturePointsCharge } from "@/lib/points/feature-charge";
import { getImageToolCreditCost } from "@/lib/points/config";
import {
  getFriendlyRateLimitMessage,
  getUserFacingRequestErrorMessage,
  isRateLimitError,
} from "@/lib/request-error";

export const maxDuration = 180;

function parseIncludeBase64(value: unknown): boolean {
  if (typeof value === "boolean") return value;
  const normalized = String(value ?? "").trim().toLowerCase();
  return normalized === "true" || normalized === "1" || normalized === "yes";
}

function buildExtendSuccessPayload(result: Awaited<ReturnType<typeof executeExtendJob>>) {
  return {
    success: true,
    original_url: result.original_url,
    thumbnail_url: result.thumbnail_url,
    ...(result.image_base64 ? { base64: result.image_base64 } : {}),
    processing_time: result.processing_time,
  };
}

export async function POST(request: NextRequest) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ error: "未授权，请先登录" }, { status: 401 });
    }

    const contentType = request.headers.get("content-type") || "";

    let imageUrl: string | null = null;
    let imageBase64: string | null = null;
    let prompt = "图像拓展处理";
    let chatId: string | null = null;
    let messageId: string | null = null;
    let includeBase64 = false;
    const requestId = `extend-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;

    if (contentType.includes("application/json")) {
      const body = await request.json();
      imageUrl = body.image_url ? String(body.image_url).trim() : null;
      imageBase64 = body.image_base64 ? String(body.image_base64).trim() : null;
      prompt = body.prompt || prompt;
      chatId = body.chatId || null;
      messageId = body.messageId || null;
      includeBase64 = parseIncludeBase64(body.includeBase64);

      if (!imageUrl && !imageBase64) {
        return NextResponse.json(
          { error: "缺少image_base64或image_url参数" },
          { status: 400 },
        );
      }

      console.log("[Extend API] Request received:", {
        requestId,
        source: imageUrl ? "url" : "base64",
        includeBase64,
        chatId,
        messageId,
        xScale: body.xScale,
        yScale: body.yScale,
      });

      const pointsConfig = await getPointsSystemConfig();
      const pointsCharge = await prepareFeaturePointsCharge({
        userId: session.user.id,
        unitCost: getImageToolCreditCost(pointsConfig, "extend"),
        reason: "image_extend",
        modelId: "image-extend",
        note: "图片扩图消耗积分",
        pointsConfig,
      });
      if (!pointsCharge.ok) {
        return NextResponse.json(pointsCharge.payload, { status: pointsCharge.status });
      }

      const result = await executeExtendJob({
        userId: session.user.id,
        imageUrl,
        imageBase64,
        prompt,
        chatId,
        messageId,
        xScale: body.xScale ? Number(body.xScale) : undefined,
        yScale: body.yScale ? Number(body.yScale) : undefined,
        includeBase64,
        requestId,
      });

      if (pointsCharge.chargeable) {
        try {
          await pointsCharge.consume();
        } catch (pointsError) {
          console.error("[Points] Failed to consume extend points:", pointsError);
        }
      }

      console.log("[Extend API] Request completed:", {
        requestId,
        includeBase64,
        processingTime: result.processing_time,
        originalUrl: result.original_url.slice(0, 120),
      });

      return NextResponse.json(buildExtendSuccessPayload(result));
    }

    if (contentType.includes("multipart/form-data")) {
      const formData = await request.formData();
      const file = formData.get("file") as File | null;
      if (!file) {
        return NextResponse.json({ error: "缺少file参数" }, { status: 400 });
      }

      const arrayBuffer = await file.arrayBuffer();
      const buffer = Buffer.from(arrayBuffer);
      const multipartChatId = String(formData.get("chatId") || "") || null;
      const multipartMessageId = String(formData.get("messageId") || "") || null;
      includeBase64 = parseIncludeBase64(formData.get("includeBase64"));
      console.log("[Extend API] Multipart request received:", {
        requestId,
        includeBase64,
        chatId: multipartChatId,
        messageId: multipartMessageId,
        bytes: buffer.length,
      });

      const pointsConfig = await getPointsSystemConfig();
      const pointsCharge = await prepareFeaturePointsCharge({
        userId: session.user.id,
        unitCost: getImageToolCreditCost(pointsConfig, "extend"),
        reason: "image_extend",
        modelId: "image-extend",
        note: "图片扩图消耗积分",
        pointsConfig,
      });
      if (!pointsCharge.ok) {
        return NextResponse.json(pointsCharge.payload, { status: pointsCharge.status });
      }

      const result = await executeExtendJob({
        userId: session.user.id,
        imageBase64: buffer.toString("base64"),
        prompt: String(formData.get("prompt") || prompt),
        chatId: multipartChatId,
        messageId: multipartMessageId,
        includeBase64,
        requestId,
      });

      if (pointsCharge.chargeable) {
        try {
          await pointsCharge.consume();
        } catch (pointsError) {
          console.error("[Points] Failed to consume extend points:", pointsError);
        }
      }

      console.log("[Extend API] Multipart request completed:", {
        requestId,
        includeBase64,
        processingTime: result.processing_time,
        originalUrl: result.original_url.slice(0, 120),
      });

      return NextResponse.json(buildExtendSuccessPayload(result));
    }

    return NextResponse.json(
      { error: "不支持的Content-Type，请使用application/json或multipart/form-data" },
      { status: 400 },
    );
  } catch (error) {
    if (error instanceof ExtendServiceError) {
      if (error.status === 429 || isRateLimitError(error)) {
        return NextResponse.json(
          {
            error: getFriendlyRateLimitMessage("当前操作过于频繁，请稍后再试"),
            detail: error.detail || error.message,
            retryAfter: 10,
          },
          {
            status: 429,
            headers: {
              "Retry-After": "10",
            },
          },
        );
      }

      return NextResponse.json(
        {
          error: getUserFacingRequestErrorMessage(error, "图像拓展失败"),
          detail: error.detail || error.message,
        },
        { status: error.status },
      );
    }

    console.error("[Extend API] 错误:", error);
    if (isRateLimitError(error)) {
      return NextResponse.json(
        {
          error: getFriendlyRateLimitMessage("当前操作过于频繁，请稍后再试"),
          detail: error instanceof Error ? error.message : String(error),
          retryAfter: 10,
        },
        {
          status: 429,
          headers: {
            "Retry-After": "10",
          },
        },
      );
    }
    return NextResponse.json(
      {
        error: getUserFacingRequestErrorMessage(error, "图像拓展失败"),
        detail: error instanceof Error ? error.message : String(error),
      },
      { status: 500 },
    );
  }
}