import { NextResponse } from "next/server";
import { z } from "zod";

import { requireApiAccess } from "../../../../lib/api/auth";
import { copyOptimizationRequestSchema } from "../../../../lib/domain/validation";
import { LlmValidationError } from "../../../../lib/llm/client";
import { optimizeRenweiCopy } from "../../../../lib/workflow/renwei-copy-optimizer";

export async function POST(request: Request) {
  const access = requireApiAccess(request);
  if (!access.ok) {
    return access.response;
  }

  try {
    const payload = copyOptimizationRequestSchema.parse(await request.json());
    const result = await optimizeRenweiCopy(payload);
    return NextResponse.json({ result });
  } catch (error) {
    return jsonError(error, getErrorStatus(error));
  }
}

function jsonError(error: unknown, status: number) {
  const message =
    error instanceof z.ZodError
      ? "请输入需要优化的文案"
      : error instanceof Error
        ? error.message
        : "文案优化失败";

  return NextResponse.json({ error: message }, { status });
}

function getErrorStatus(error: unknown) {
  if (error instanceof LlmValidationError) return 502;
  if (error instanceof Error && /^LLM\b|provider/i.test(error.message)) return 502;
  return 400;
}