paseo/packages/desktop/src/window/window-manager.ts

import { app, BrowserWindow, ipcMain } from "electron";

export function registerWindowManager(): void {
  // ---------------------------------------------------------------------------
  // Manual window dragging (replaces flaky CSS -webkit-app-region: drag).
  // State is keyed per window id to support multiple windows.
  // ---------------------------------------------------------------------------
  const moveStates = new Map<number, { offsetX: number; offsetY: number }>();

  ipcMain.on(
    "paseo:window:startMove",
    (event, payload: { screenX: number; screenY: number }) => {
      if (typeof payload?.screenX !== "number" || typeof payload?.screenY !== "number") return;
      const win = BrowserWindow.fromWebContents(event.sender);
      if (!win) return;
      const [winX, winY] = win.getPosition();
      moveStates.set(win.id, { offsetX: payload.screenX - winX, offsetY: payload.screenY - winY });
    }
  );

  ipcMain.on(
    "paseo:window:moving",
    (event, payload: { screenX: number; screenY: number }) => {
      if (typeof payload?.screenX !== "number" || typeof payload?.screenY !== "number") return;
      const win = BrowserWindow.fromWebContents(event.sender);
      if (!win) return;
      const state = moveStates.get(win.id);
      if (!state) return;
      win.setPosition(
        Math.round(payload.screenX - state.offsetX),
        Math.round(payload.screenY - state.offsetY)
      );
    }
  );

  ipcMain.on("paseo:window:endMove", (event) => {
    const win = BrowserWindow.fromWebContents(event.sender);
    if (win) moveStates.delete(win.id);
  });

  app.on("browser-window-created", (_event, win) => {
    win.on("closed", () => moveStates.delete(win.id));
  });

  ipcMain.handle("paseo:window:toggleMaximize", (event) => {
    const win = BrowserWindow.fromWebContents(event.sender);
    if (!win) return;
    if (win.isMaximized()) {
      win.unmaximize();
    } else {
      win.maximize();
    }
  });

  ipcMain.handle("paseo:window:isFullscreen", (event) => {
    const win = BrowserWindow.fromWebContents(event.sender);
    return win?.isFullScreen() ?? false;
  });

  ipcMain.handle("paseo:window:setBadgeCount", (_event, count?: number) => {
    if (process.platform === "darwin" || process.platform === "linux") {
      app.setBadgeCount(count ?? 0);
    }
  });
}

export function setupWindowResizeEvents(win: BrowserWindow): void {
  win.on("resize", () => {
    win.webContents.send("paseo:window:resized", {});
  });

  win.on("enter-full-screen", () => {
    win.webContents.send("paseo:window:resized", {});
  });

  win.on("leave-full-screen", () => {
    win.webContents.send("paseo:window:resized", {});
  });
}

/**
 * Prevent Electron from navigating to files dragged onto the window.
 * The renderer handles drag-drop via standard HTML5 APIs instead.
 */
export function setupDragDropPrevention(win: BrowserWindow): void {
  win.webContents.on("will-navigate", (event, url) => {
    // Allow normal navigation (e.g. dev server hot-reload) but block file:// URLs
    // that result from dropping files onto the window.
    if (url.startsWith("file://")) {
      event.preventDefault();
    }
  });
}