import "./env";
import { app, BrowserWindow, components, dialog, ipcMain, session, shell } from "electron";
import { join } from "node:path";
import { startApiServer } from "./apiServer";
import { PORT } from "./constants";
import { applySettings, loadSettings, saveSettings } from "./settings";

const APP_URL = `http://127.0.0.1:${PORT}`;
const LOGIN_HOSTS = ["spotify.com", "google.com", "facebook.com", "apple.com"];
let mainWindow: BrowserWindow | undefined;

if (!app.requestSingleInstanceLock()) {
  app.quit();
} else {
  app.on("second-instance", () => {
    if (!mainWindow) return;
    if (mainWindow.isMinimized()) mainWindow.restore();
    mainWindow.focus();
  });
  app.whenReady().then(start);
}

async function start() {
  app.userAgentFallback = app.userAgentFallback.replace(/ (Electron|aurora-spotirip|Aurora SpotiRip)\/\S+/g, "");
  applySettings();
  registerIpc();

  try {
    await startApiServer(PORT, join(app.getAppPath(), "dist"), { onSpotifyLogin: adoptSpotifyLogin });
  } catch (error) {
    const inUse = (error as NodeJS.ErrnoException).code === "EADDRINUSE";
    dialog.showErrorBox(
      "Aurora SpotiRip could not start",
      inUse
        ? `Port ${PORT} is already in use by another program. Close it and start Aurora SpotiRip again.`
        : String(error),
    );
    app.quit();
    return;
  }

  try {
    await components.whenReady();
  } catch (error) {
    console.error("Widevine is unavailable; in-app playback will use Spotify Connect instead.", error);
  }

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

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1360,
    height: 880,
    minWidth: 960,
    minHeight: 600,
    backgroundColor: "#0f1318",
    title: "Aurora SpotiRip",
    icon: join(app.getAppPath(), "build", "icon.png"),
    autoHideMenuBar: true,
    webPreferences: {
      preload: join(__dirname, "preload.cjs"),
      contextIsolation: true,
      nodeIntegration: false,
    },
  });

  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
    shell.openExternal(url);
    return { action: "deny" };
  });
  mainWindow.webContents.on("will-navigate", (event, url) => {
    const { origin, hostname, pathname } = new URL(url);
    if (origin === APP_URL && pathname === "/_api/spotify-auth") {
      event.preventDefault();
      shell.openExternal(url);
      return;
    }
    if (origin === APP_URL || LOGIN_HOSTS.some((host) => hostname === host || hostname.endsWith(`.${host}`))) return;
    event.preventDefault();
    shell.openExternal(url);
  });

  mainWindow.webContents.on("console-message", (event) => {
    if (event.level === "warning" || event.level === "error") {
      console.log(`[page ${event.level}] ${event.message}`);
    }
  });

  mainWindow.loadURL(APP_URL);
  mainWindow.on("closed", () => {
    mainWindow = undefined;
  });
}

async function adoptSpotifyLogin(setCookies: string[]) {
  for (const header of setCookies) {
    const [pair, ...attributes] = header.split(";").map((part) => part.trim());
    const index = pair.indexOf("=");
    const name = pair.slice(0, index);
    const value = decodeURIComponent(pair.slice(index + 1));
    const maxAge = Number(attributes.find((attr) => /^max-age=/i.test(attr))?.split("=")[1]);
    if (!name || name === "spotirip_oauth_state") continue;
    await session.defaultSession.cookies.set({
      url: APP_URL,
      name,
      value,
      path: "/",
      secure: true,
      httpOnly: attributes.some((attr) => /^httponly$/i.test(attr)),
      sameSite: "lax",
      ...(Number.isFinite(maxAge) ? { expirationDate: Date.now() / 1000 + maxAge } : {}),
    });
  }
  if (!mainWindow) createWindow();
  else {
    mainWindow.loadURL(APP_URL);
    if (mainWindow.isMinimized()) mainWindow.restore();
    mainWindow.focus();
  }
}

function registerIpc() {
  ipcMain.handle("settings:get-download-folder", () => loadSettings().downloadFolder);
  ipcMain.handle("settings:choose-download-folder", async () => {
    const result = await dialog.showOpenDialog(mainWindow!, {
      title: "Choose download folder",
      defaultPath: loadSettings().downloadFolder,
      properties: ["openDirectory", "createDirectory"],
    });
    if (result.canceled || !result.filePaths[0]) return undefined;
    return saveSettings({ downloadFolder: result.filePaths[0] }).downloadFolder;
  });
  ipcMain.handle("shell:show-in-folder", (_event, path: string) => shell.showItemInFolder(path));
}

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