respira/electron/main.ts

import { app, BrowserWindow, ipcMain, dialog } from "electron";
import { join } from "path";
import { promises as fs } from "fs";
import Store from "electron-store";
import { updateElectronApp, UpdateSourceType } from "update-electron-app";

import started from "electron-squirrel-startup";

// Handle creating/removing shortcuts on Windows when installing/uninstalling.
if (started) {
  app.quit();
}

updateElectronApp({
  updateSource: {
    type: UpdateSourceType.StaticStorage,
    baseUrl: `https://jhbruhn.github.io/respira/update/${process.platform}/${process.arch}`,
  },
});

// Enable Web Bluetooth
app.commandLine.appendSwitch("enable-web-bluetooth", "true");
app.commandLine.appendSwitch("enable-experimental-web-platform-features");

const store = new Store();

function createWindow() {
  const mainWindow = new BrowserWindow({
    width: 1600,
    height: 1000,
    minWidth: 1280, // Prevent layout from breaking into single-column mobile view
    minHeight: 800,
    autoHideMenuBar: true, // Hide the menu bar (can be toggled with Alt key)
    title: `Respira v${app.getVersion()}`,
    webPreferences: {
      preload: join(__dirname, "preload.js"),
      nodeIntegration: false,
      contextIsolation: true,
      sandbox: true,
      webSecurity: true,
      // Enable SharedArrayBuffer for Pyodide
      additionalArguments: ["--enable-features=SharedArrayBuffer"],
    },
  });

  // Handle Web Bluetooth device selection
  // This is CRITICAL - Electron doesn't show browser's native picker
  // The handler may be called multiple times as new devices are discovered
  let deviceSelectionCallback: ((deviceId: string) => void) | null = null;

  mainWindow.webContents.on(
    "select-bluetooth-device",
    (event, deviceList, callback) => {
      event.preventDefault();

      console.log(
        "[Bluetooth] Device list updated:",
        deviceList.map((d) => ({
          name: d.deviceName,
          id: d.deviceId,
        })),
      );

      // Store the callback for later use (may be called multiple times as devices are discovered)
      console.log(
        "[Bluetooth] Storing new callback, previous callback existed:",
        !!deviceSelectionCallback,
      );
      deviceSelectionCallback = callback;

      // Always send device list to renderer (even if empty) to show scanning UI
      console.log("[Bluetooth] Sending device list to renderer for selection");
      mainWindow.webContents.send(
        "bluetooth:device-list",
        deviceList.map((d) => ({
          deviceId: d.deviceId,
          deviceName: d.deviceName || "Unknown Device",
        })),
      );
    },
  );

  // Handle device selection from renderer
  ipcMain.on("bluetooth:select-device", (_event, deviceId: string) => {
    console.log("[Bluetooth] Renderer selected device:", deviceId);
    if (deviceSelectionCallback) {
      console.log("[Bluetooth] Calling callback with deviceId:", deviceId);
      deviceSelectionCallback(deviceId);
      deviceSelectionCallback = null;
    } else {
      console.error(
        "[Bluetooth] No callback available! Device selection may have timed out.",
      );
    }
  });

  // Optional: Handle Bluetooth pairing for Windows/Linux PIN validation
  mainWindow.webContents.session.setBluetoothPairingHandler(
    (details, callback) => {
      console.log("[Bluetooth] Pairing request:", details);
      // Auto-confirm pairing
      callback({ confirmed: true /*pairingKind: 'confirm' */ });
    },
  );

  // Set COOP/COEP headers for Pyodide SharedArrayBuffer support
  mainWindow.webContents.session.webRequest.onHeadersReceived(
    (details, callback) => {
      // Apply headers to ALL resources including workers
      const headers: Record<string, string[]> = {
        ...details.responseHeaders,
        "Cross-Origin-Opener-Policy": ["unsafe-none"],
        "Cross-Origin-Embedder-Policy": ["unsafe-none"],
      };

      // For same-origin resources (including workers), add CORP header
      if (
        details.url.startsWith("http://localhost") ||
        details.url.startsWith("file://")
      ) {
        headers["Cross-Origin-Resource-Policy"] = ["same-origin"];
      }

      callback({ responseHeaders: headers });
    },
  );

  // Load the app
  // MAIN_WINDOW_VITE_DEV_SERVER_URL is provided by @electron-forge/plugin-vite
  if (MAIN_WINDOW_VITE_DEV_SERVER_URL) {
    mainWindow.loadURL(MAIN_WINDOW_VITE_DEV_SERVER_URL);
    mainWindow.webContents.openDevTools();
  } else {
    // MAIN_WINDOW_VITE_NAME is the renderer name from forge.config.js
    mainWindow.loadFile(
      join(__dirname, `../renderer/${MAIN_WINDOW_VITE_NAME}/index.html`),
    );
  }
}

app.whenReady().then(createWindow);

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

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

// IPC Handlers

// Storage handlers (using electron-store)
ipcMain.handle("storage:savePattern", async (_event, pattern) => {
  try {
    store.set(`pattern:${pattern.uuid}`, pattern);
    store.set("pattern:latest", pattern);
    console.log(
      "[Storage] Saved pattern:",
      pattern.fileName,
      "UUID:",
      pattern.uuid,
    );
    return true;
  } catch (err) {
    console.error("[Storage] Failed to save pattern:", err);
    throw err;
  }
});

ipcMain.handle("storage:getPattern", async (_event, uuid) => {
  try {
    const pattern = store.get(`pattern:${uuid}`, null);
    if (pattern) {
      console.log("[Storage] Retrieved pattern for UUID:", uuid);
    }
    return pattern;
  } catch (err) {
    console.error("[Storage] Failed to get pattern:", err);
    return null;
  }
});

ipcMain.handle("storage:getLatest", async () => {
  try {
    const pattern = store.get("pattern:latest", null);
    return pattern;
  } catch (err) {
    console.error("[Storage] Failed to get latest pattern:", err);
    return null;
  }
});

ipcMain.handle("storage:deletePattern", async (_event, uuid) => {
  try {
    store.delete(`pattern:${uuid}`);
    console.log("[Storage] Deleted pattern with UUID:", uuid);
    return true;
  } catch (err) {
    console.error("[Storage] Failed to delete pattern:", err);
    throw err;
  }
});

ipcMain.handle("storage:clear", async () => {
  try {
    const keys = Object.keys(store.store).filter((k) =>
      k.startsWith("pattern:"),
    );
    keys.forEach((k) => store.delete(k));
    console.log("[Storage] Cleared all patterns");
    return true;
  } catch (err) {
    console.error("[Storage] Failed to clear cache:", err);
    throw err;
  }
});

// File dialog handlers
ipcMain.handle("dialog:openFile", async (_event, options) => {
  try {
    const result = await dialog.showOpenDialog({
      properties: ["openFile"],
      filters: options.filters,
    });

    if (result.canceled || result.filePaths.length === 0) {
      return null;
    }

    const filePath = result.filePaths[0];
    const fileName = filePath.split(/[\\/]/).pop() || "";

    console.log("[Dialog] File selected:", fileName);
    return { filePath, fileName };
  } catch (err) {
    console.error("[Dialog] Failed to open file:", err);
    throw err;
  }
});

ipcMain.handle("dialog:saveFile", async (_event, options) => {
  try {
    const result = await dialog.showSaveDialog({
      defaultPath: options.defaultPath,
      filters: options.filters,
    });

    if (result.canceled) {
      return null;
    }

    console.log("[Dialog] Save file selected:", result.filePath);
    return result.filePath;
  } catch (err) {
    console.error("[Dialog] Failed to save file:", err);
    throw err;
  }
});

// File system handlers
ipcMain.handle("fs:readFile", async (_event, filePath) => {
  try {
    const buffer = await fs.readFile(filePath);
    console.log("[FS] Read file:", filePath, "Size:", buffer.length);
    return buffer;
  } catch (err) {
    console.error("[FS] Failed to read file:", err);
    throw err;
  }
});

ipcMain.handle("fs:writeFile", async (_event, filePath, data) => {
  try {
    await fs.writeFile(filePath, Buffer.from(data));
    console.log("[FS] Wrote file:", filePath);
    return true;
  } catch (err) {
    console.error("[FS] Failed to write file:", err);
    throw err;
  }
});