import http from "node:http";
import { execFile } from "node:child_process";
import { readFile } from "node:fs/promises";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const pagePaths = new Map([
  ["/", join(__dirname, "baishun-game-test.html")],
  ["/baishun-game-test.html", join(__dirname, "baishun-game-test.html")],
  ["/lucky-gift-test.html", join(__dirname, "lucky-gift-test.html")],
]);
const port = Number(process.env.PORT || 8787);
const upstreamBase = (process.env.BAISHUN_API_BASE || "https://api-test.global-interaction.com").replace(/\/+$/, "");

function readBody(req) {
  return new Promise((resolve, reject) => {
    const chunks = [];
    req.on("data", (chunk) => chunks.push(chunk));
    req.on("end", () => resolve(Buffer.concat(chunks)));
    req.on("error", reject);
  });
}

function copyProxyHeaders(req) {
  const headers = new Headers();
  for (const [key, value] of Object.entries(req.headers)) {
    if (!value) continue;
    const lower = key.toLowerCase();
    if (["host", "origin", "referer", "connection", "content-length", "accept-encoding"].includes(lower)) continue;
    headers.set(key, Array.isArray(value) ? value.join(", ") : value);
  }
  headers.set("Accept-Encoding", "identity");
  return headers;
}

async function proxyApi(req, res) {
  const targetUrl = `${upstreamBase}${req.url}`;
  const body = req.method === "GET" || req.method === "HEAD" ? undefined : await readBody(req);
  const upstream = await fetch(targetUrl, {
    method: req.method,
    headers: copyProxyHeaders(req),
    body,
    redirect: "manual",
  });
  const responseBody = Buffer.from(await upstream.arrayBuffer());
  res.writeHead(upstream.status, {
    "Content-Type": upstream.headers.get("content-type") || "application/octet-stream",
    "Cache-Control": "no-store",
  });
  res.end(responseBody);
}

function sqlString(value) {
  return `'${String(value ?? "").replaceAll("\\", "\\\\").replaceAll("'", "''")}'`;
}

function runMysqlJSON(sql) {
  return new Promise((resolve, reject) => {
    execFile(
      "docker",
      ["exec", "hyapp-mysql", "mysql", "-uroot", "-proot", "--batch", "--raw", "--skip-column-names", "-e", sql],
      { maxBuffer: 1024 * 1024 },
      (err, stdout, stderr) => {
        if (err) {
          reject(new Error((stderr || err.message).trim()));
          return;
        }
        const raw = stdout.trim();
        if (!raw) {
          resolve({});
          return;
        }
        try {
          resolve(JSON.parse(raw.split(/\r?\n/).at(-1)));
        } catch {
          reject(new Error(`mysql json parse failed: ${raw}`));
        }
      },
    );
  });
}

async function luckyGiftStats(req, res, url) {
  const appCode = url.searchParams.get("app_code") || "lalu";
  const userID = url.searchParams.get("user_id") || "";
  const poolID = url.searchParams.get("pool_id") || "";
  if (!/^\d+$/.test(userID)) {
    res.writeHead(400, { "Content-Type": "application/json; charset=utf-8", "Cache-Control": "no-store" });
    res.end(JSON.stringify({ code: "INVALID_ARGUMENT", message: "user_id is required" }));
    return;
  }
  const appSQL = sqlString(appCode);
  const userSQL = sqlString(userID);
  const poolSQL = sqlString(poolID);
  const poolFilter = poolID ? `AND pool_id = ${poolSQL}` : "";
  const statePoolFilter = poolID ? `AND gift_id = ${poolSQL}` : "";
  const sql = `
    SELECT JSON_OBJECT(
      'app_code', ${appSQL},
      'user_id', CAST(${userSQL} AS UNSIGNED),
      'pool_id', ${poolSQL},
      'draw_count', COALESCE((SELECT COUNT(*) FROM hyapp_activity.lucky_draw_records WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${poolFilter}), 0),
      'win_count', COALESCE((SELECT COUNT(*) FROM hyapp_activity.lucky_draw_records WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${poolFilter} AND effective_reward_coins > 0), 0),
      'granted_count', COALESCE((SELECT COUNT(*) FROM hyapp_activity.lucky_draw_records WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${poolFilter} AND reward_status = 'granted'), 0),
      'coin_spent', COALESCE((SELECT SUM(coin_spent) FROM hyapp_activity.lucky_draw_records WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${poolFilter}), 0),
      'base_reward_coins', COALESCE((SELECT SUM(base_reward_coins) FROM hyapp_activity.lucky_draw_records WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${poolFilter}), 0),
      'effective_reward_coins', COALESCE((SELECT SUM(effective_reward_coins) FROM hyapp_activity.lucky_draw_records WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${poolFilter}), 0),
      'state_paid_draws', COALESCE((SELECT SUM(paid_draws) FROM hyapp_activity.lucky_user_states WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${statePoolFilter}), 0),
      'state_cumulative_wager_coins', COALESCE((SELECT SUM(cumulative_wager_coins) FROM hyapp_activity.lucky_user_states WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${statePoolFilter}), 0),
      'state_equivalent_draws', COALESCE((SELECT MAX(equivalent_draws) FROM hyapp_activity.lucky_user_states WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${statePoolFilter}), 0),
      'loss_streak', COALESCE((SELECT MAX(loss_streak) FROM hyapp_activity.lucky_user_states WHERE app_code = ${appSQL} AND user_id = CAST(${userSQL} AS UNSIGNED) ${statePoolFilter}), 0)
    )
  `;
  const data = await runMysqlJSON(sql);
  res.writeHead(200, { "Content-Type": "application/json; charset=utf-8", "Cache-Control": "no-store" });
  res.end(JSON.stringify({ code: "OK", data }));
}

const server = http.createServer(async (req, res) => {
  try {
    if (req.method === "OPTIONS") {
      res.writeHead(204);
      res.end();
      return;
    }
    const url = new URL(req.url || "/", `http://${req.headers.host || "127.0.0.1"}`);
    const pagePath = pagePaths.get(url.pathname);
    if (pagePath) {
      const html = await readFile(pagePath);
      res.writeHead(200, {
        "Content-Type": "text/html; charset=utf-8",
        "Cache-Control": "no-store",
      });
      res.end(html);
      return;
    }
    if (req.url?.startsWith("/api/")) {
      await proxyApi(req, res);
      return;
    }
    if (url.pathname === "/__local/lucky-gift/stats") {
      await luckyGiftStats(req, res, url);
      return;
    }
    res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
    res.end("not found");
  } catch (err) {
    res.writeHead(502, { "Content-Type": "text/plain; charset=utf-8" });
    res.end(err instanceof Error ? err.message : String(err));
  }
});

server.listen(port, "127.0.0.1", () => {
  console.log(`Baishun game test page: http://127.0.0.1:${port}/baishun-game-test.html`);
  console.log(`Lucky gift test page: http://127.0.0.1:${port}/lucky-gift-test.html`);
  console.log(`Proxy upstream: ${upstreamBase}`);
});