import { NextRequest, NextResponse } from "next/server";
import { createWord, listWords, type Grade } from "@/lib/db";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

export async function GET(request: NextRequest) {
  const searchParams = request.nextUrl.searchParams;
  const grade = searchParams.get("grade") ?? undefined;
  const classTypeId = Number(searchParams.get("classTypeId"));
  const enabledOnly = searchParams.get("enabledOnly") === "true";

  const words = listWords({
    grade,
    classTypeId: Number.isFinite(classTypeId) && classTypeId > 0 ? classTypeId : undefined,
    enabledOnly,
  });

  return NextResponse.json({ words });
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const word = createWord({
      grade: body.grade as Grade,
      classTypeId: Number(body.classTypeId),
      english: String(body.english ?? ""),
      chinese: String(body.chinese ?? ""),
      image: String(body.image ?? ""),
      audio: String(body.audio ?? ""),
      enabled: Boolean(body.enabled),
    });

    return NextResponse.json({ word }, { status: 201 });
  } catch (error) {
    return NextResponse.json({ message: getErrorMessage(error) }, { status: 400 });
  }
}

function getErrorMessage(error: unknown) {
  const message = error instanceof Error ? error.message : "操作失败";
  if (message.includes("UNIQUE")) return "相同年级、班级类型和英语题库已存在";
  if (message.includes("FOREIGN KEY")) return "班级类型不存在";
  return message;
}