import { NextRequest, NextResponse } from "next/server";
import { and, eq, ne, sql } from "drizzle-orm";
import { db } from "@/lib/db";
import { paymentOrder, pointsLedger, systemSettings, user } from "@/lib/db/schema";
import {
  DULUPAY_CONFIG_KEY,
  normalizeDulupayConfig,
} from "@/lib/payment/dulupay-config";
import { verifyDulupayV1Sign } from "@/lib/payment/dulupay";

export const runtime = "nodejs";

function plainText(text: string, status = 200) {
  return new NextResponse(text, {
    status,
    headers: {
      "Content-Type": "text/plain; charset=utf-8",
      "Cache-Control": "no-store",
    },
  });
}

async function readNotifyParams(request: NextRequest) {
  const url = new URL(request.url);
  const record: Record<string, string> = {};

  url.searchParams.forEach((value, key) => {
    record[key] = value;
  });

  if (request.method === "GET") {
    return record;
  }

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

  if (contentType.includes("application/json")) {
    const data = (await request.json().catch(() => null)) as
      | Record<string, unknown>
      | null;
    if (data) {
      for (const [key, value] of Object.entries(data)) {
        if (value !== undefined && value !== null) {
          record[key] = String(value);
        }
      }
    }
    return record;
  }

  const text = await request.text();
  if (!text) return record;

  const formParams = new URLSearchParams(text);
  formParams.forEach((value, key) => {
    record[key] = value;
  });

  return record;
}

async function handleNotify(request: NextRequest) {
  const params = await readNotifyParams(request);
  const outTradeNo = String(params.out_trade_no || "").trim();
  const tradeNo = String(params.trade_no || "").trim();
  const tradeStatus = String(params.trade_status || "").trim();
  const moneyRaw = String(params.money || "").trim();

  if (!outTradeNo) {
    return plainText("fail", 400);
  }

  const setting = await db
    .select()
    .from(systemSettings)
    .where(eq(systemSettings.key, DULUPAY_CONFIG_KEY))
    .limit(1)
    .then((rows) => rows[0]);

  const config = normalizeDulupayConfig(setting?.value);
  if (!config.enabled || config.version !== "v1" || !config.key) {
    return plainText("fail", 400);
  }

  if (!verifyDulupayV1Sign(params, config.key)) {
    return plainText("fail", 400);
  }

  const order = await db
    .select({
      id: paymentOrder.id,
      userId: paymentOrder.userId,
      status: paymentOrder.status,
      points: paymentOrder.points,
      amountCents: paymentOrder.amountCents,
    })
    .from(paymentOrder)
    .where(
      and(
        eq(paymentOrder.outTradeNo, outTradeNo),
        eq(paymentOrder.provider, "dulupay")
      )
    )
    .limit(1)
    .then((rows) => rows[0]);

  if (!order) {
    return plainText("fail", 404);
  }

  const callbackAmountCents = Number.isFinite(Number(moneyRaw))
    ? Math.round(Number(moneyRaw) * 100)
    : null;

  if (
    callbackAmountCents !== null &&
    callbackAmountCents > 0 &&
    callbackAmountCents !== order.amountCents
  ) {
    await db
      .update(paymentOrder)
      .set({
        status: "failed",
        tradeNo: tradeNo || null,
        errorMessage: `回调金额不一致: ${moneyRaw}`,
        rawCallback: params,
        updatedAt: new Date(),
      })
      .where(and(eq(paymentOrder.id, order.id), ne(paymentOrder.status, "paid")));

    return plainText("fail", 400);
  }

  if (tradeStatus === "TRADE_SUCCESS") {
    await db.transaction(async (tx) => {
      const updated = await tx
        .update(paymentOrder)
        .set({
          status: "paid",
          tradeNo: tradeNo || null,
          rawCallback: params,
          errorMessage: null,
          paidAt: new Date(),
          updatedAt: new Date(),
        })
        .where(
          and(eq(paymentOrder.id, order.id), ne(paymentOrder.status, "paid"))
        )
        .returning({
          id: paymentOrder.id,
          userId: paymentOrder.userId,
          points: paymentOrder.points,
          outTradeNo: paymentOrder.outTradeNo,
        });

      if (updated.length === 0) {
        return;
      }

      const paidOrder = updated[0];

      if (paidOrder.points > 0) {
        await tx
          .update(user)
          .set({
            pointsBalance: sql`${user.pointsBalance} + ${paidOrder.points}`,
            updatedAt: new Date(),
          })
          .where(eq(user.id, paidOrder.userId));

        await tx.insert(pointsLedger).values({
          userId: paidOrder.userId,
          amount: paidOrder.points,
          reason: "recharge",
          note: "充值积分",
        });
      }
    });

    return plainText("success");
  }

  const mappedStatus = tradeStatus === "TRADE_CLOSED" ? "closed" : "failed";

  await db
    .update(paymentOrder)
    .set({
      status: mappedStatus,
      tradeNo: tradeNo || null,
      errorMessage: tradeStatus ? `trade_status=${tradeStatus}` : "支付失败",
      rawCallback: params,
      updatedAt: new Date(),
    })
    .where(and(eq(paymentOrder.id, order.id), ne(paymentOrder.status, "paid")));

  return plainText("success");
}

export async function GET(request: NextRequest) {
  try {
    return await handleNotify(request);
  } catch (error) {
    console.error("[DuluPay Notify] GET error:", error);
    return plainText("fail", 500);
  }
}

export async function POST(request: NextRequest) {
  try {
    return await handleNotify(request);
  } catch (error) {
    console.error("[DuluPay Notify] POST error:", error);
    return plainText("fail", 500);
  }
}