import { NextResponse } from "next/server";
import { z } from "zod";
import {
  AUTOTRADE_API_ERROR_CODE,
  createAutotradeErrorResponse,
  getAutotradeSession,
  getAutotradeUserId,
  readJsonBody,
  sanitizeAutotradeError,
  stopAutotradeSession,
} from "@/app/api/autotrade/_shared";
import type { AutotradeStopReason } from "@/features/autotrade/types/autotrade.types";

const stopRequestSchema = z.object({
  sessionId: z.string().uuid().optional(),
  reason: z
    .enum([
      "browser_exit",
      "external_leave",
      "manual",
      "emergency",
      "heartbeat_timeout",
    ])
    .optional(),
});

export async function POST(request: Request) {
  const userId = await getAutotradeUserId(request.headers);
  if (!userId) {
    return createAutotradeErrorResponse({
      status: 401,
      code: AUTOTRADE_API_ERROR_CODE.AUTH_REQUIRED,
      message: "로그인이 필요합니다.",
    });
  }

  const rawBody = await readJsonBody(request);
  const parsed = stopRequestSchema.safeParse(rawBody ?? {});
  if (!parsed.success) {
    return createAutotradeErrorResponse({
      status: 400,
      code: AUTOTRADE_API_ERROR_CODE.INVALID_REQUEST,
      message: parsed.error.issues[0]?.message ?? "세션 종료 입력값이 올바르지 않습니다.",
    });
  }

  try {
    const session = getAutotradeSession(userId);
    if (!session) {
      return NextResponse.json({
        ok: true,
        session: null,
      });
    }

    if (parsed.data.sessionId && parsed.data.sessionId !== session.sessionId) {
      return createAutotradeErrorResponse({
        status: 409,
        code: AUTOTRADE_API_ERROR_CODE.CONFLICT,
        message: "세션 식별자가 일치하지 않습니다.",
      });
    }

    const reason: AutotradeStopReason = parsed.data.reason ?? "manual";
    const stopped = stopAutotradeSession(userId, reason);

    return NextResponse.json({
      ok: true,
      session: stopped,
    });
  } catch (error) {
    return createAutotradeErrorResponse({
      status: 500,
      code: AUTOTRADE_API_ERROR_CODE.INTERNAL,
      message: sanitizeAutotradeError(error, "세션 종료 중 오류가 발생했습니다."),
    });
  }
}