const { app, BrowserWindow, shell, Menu, session } = require("electron");
const path = require("node:path");
const fs = require("node:fs");

// Gatekeeper / ad-hoc 서명 환경에서 GPU Helper SIGTRAP 완화
app.disableHardwareAcceleration();
app.commandLine.appendSwitch("disable-gpu");
app.commandLine.appendSwitch("disable-gpu-compositing");
app.commandLine.appendSwitch("disable-software-rasterizer");
app.commandLine.appendSwitch("no-sandbox");
app.commandLine.appendSwitch("disable-dev-shm-usage");

const WINDOW_WIDTH = 390;
const WINDOW_HEIGHT = 720;

const DEFAULT_URL =
  process.env.CHATBOT_APP_URL ||
  "https://chatbot.exdev.co.kr/chatbot/ai/?desktop=1";

const logFile = path.join(app.getPath("userData"), "ex-ai-chatbot.log");

function log(msg) {
  const line = `[${new Date().toISOString()}] ${msg}\n`;
  try {
    fs.appendFileSync(logFile, line);
  } catch {
    /* ignore */
  }
  console.log(msg);
}

/** 챗봇 주소에서 온 마이크 요청은 매번 묻지 않고 허용한다. (음성인식 반복 권한창 방지) */
function allowMicrophoneForChatbot() {
  const allowed = new Set(["media", "audioCapture", "mediaKeySystem"]);
  const appOrigin = (() => {
    try {
      return new URL(DEFAULT_URL).origin;
    } catch {
      return null;
    }
  })();

  const isChatbotOrigin = (url) => {
    if (!appOrigin || !url) return false;
    try {
      return new URL(url).origin === appOrigin;
    } catch {
      return false;
    }
  };

  const ses = session.defaultSession;

  ses.setPermissionRequestHandler((webContents, permission, callback, details) => {
    const url = details?.requestingUrl || webContents?.getURL();
    callback(allowed.has(permission) && isChatbotOrigin(url));
  });

  ses.setPermissionCheckHandler((_webContents, permission, requestingOrigin, details) => {
    const url = requestingOrigin || details?.requestingUrl;
    return allowed.has(permission) && isChatbotOrigin(url);
  });

  if (typeof ses.setDevicePermissionHandler === "function") {
    ses.setDevicePermissionHandler((details) => isChatbotOrigin(details?.origin));
  }
}

function createWindow() {
  const iconPath = path.join(__dirname, "build", process.platform === "win32" ? "icon.ico" : "icon.png");
  const winOpts = {
    width: WINDOW_WIDTH,
    height: WINDOW_HEIGHT,
    minWidth: 360,
    minHeight: 520,
    title: "한국도로공사 AI 챗봇",
    backgroundColor: "#ffffff",
    autoHideMenuBar: true,
    show: false,
    webPreferences: {
      preload: path.join(__dirname, "preload.js"),
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: false,
      webSecurity: true,
    },
  };
  if (fs.existsSync(iconPath)) {
    winOpts.icon = iconPath;
  }
  const win = new BrowserWindow(winOpts);

  Menu.setApplicationMenu(null);

  win.once("ready-to-show", () => {
    win.show();
    if (process.platform === "darwin" && app.dock) {
      const dockIcon = path.join(__dirname, "build", "icon.png");
      if (fs.existsSync(dockIcon)) {
        try {
          app.dock.setIcon(dockIcon);
        } catch (e) {
          log(`dock.setIcon failed: ${e}`);
        }
      }
      app.dock.show();
    }
  });

  win.webContents.on("did-fail-load", (_e, code, desc, url) => {
    log(`did-fail-load code=${code} desc=${desc} url=${url}`);
    // 네트워크 실패 시에도 빈 창으로 종료되지 않도록 안내 페이지
    const html = `<!doctype html><meta charset="utf-8"/>
      <body style="font:14px -apple-system,sans-serif;padding:40px;line-height:1.6">
      <h2>연결 실패</h2>
      <p>챗봇 서버에 연결하지 못했습니다.</p>
      <p style="color:#666">${code}: ${desc}</p>
      <p><a href="${DEFAULT_URL}">다시 시도</a></p>
      </body>`;
    win.loadURL(`data:text/html;charset=utf-8,${encodeURIComponent(html)}`);
  });

  win.webContents.on("render-process-gone", (_e, details) => {
    log(`render-process-gone ${JSON.stringify(details)}`);
  });

  win.on("unresponsive", () => log("window unresponsive"));

  log(`loadURL ${DEFAULT_URL}`);
  win.loadURL(DEFAULT_URL).catch((err) => log(`loadURL error: ${err}`));

  win.webContents.setWindowOpenHandler(({ url }) => {
    shell.openExternal(url);
    return { action: "deny" };
  });

  return win;
}

const gotLock = app.requestSingleInstanceLock();
if (!gotLock) {
  app.quit();
} else {
  app.on("second-instance", () => {
    const wins = BrowserWindow.getAllWindows();
    if (wins.length > 0) {
      if (wins[0].isMinimized()) wins[0].restore();
      wins[0].focus();
    } else {
      createWindow();
    }
  });

  app.whenReady().then(() => {
    app.setName("EX AI Chatbot");
    log(`ready userData=${app.getPath("userData")}`);
    allowMicrophoneForChatbot();
    createWindow();

    app.on("activate", () => {
      if (BrowserWindow.getAllWindows().length === 0) {
        createWindow();
      }
    });
  });

  app.on("window-all-closed", () => {
    if (process.platform !== "darwin") {
      app.quit();
    }
  });

  process.on("uncaughtException", (err) => {
    log(`uncaughtException ${err?.stack || err}`);
  });
}