// Modules to control application life and create native browser window

const {app, BrowserWindow, Tray, nativeImage, Menu} = require('electron');
const {ipcMain} = require('electron');

const path = require('path');
const url = require('url');
require('electron-debug')();
const os = require('os');
const helpers = require('./helpers');
const fs = require('fs');
const unzip = require('unzipper');
const AutoLaunch = require('auto-launch');

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainContextWindow;
let mainWindow;
let mainWindowTray;
let mountedPIDs = [];

function createWindow() {
  // Create the browser window.
  const height = process.env.ELECTRON_START_URL ? 340 : 320;
  mainWindow = new BrowserWindow({
    width: 425,
    height: height,
    resizable: false,
    webPreferences: {
      webSecurity: !process.env.ELECTRON_START_URL
    }
  });

  // and load the index.html of the app.
  const startUrl = process.env.ELECTRON_START_URL || url.format({
    pathname: path.join(__dirname, '/build/index.html'),
    protocol: 'file:',
    slashes: true
  });
  mainWindow.loadURL(startUrl);

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  });

  if (os.platform() === 'win32') {
    const autoLauncher = new AutoLaunch({
      name: 'Repertory UI',
      path: path.resolve(path.join(app.getAppPath(), '..\\..\\repertory-ui.exe')),
    });

    const image = nativeImage.createFromPath(path.join(__dirname, '/build/icon.ico'));
    mainContextWindow = Menu.buildFromTemplate([
      {
        label: 'Visible', type: 'checkbox', click(item) {
          if (item.checked) {
            mainWindow.show();
            if (mainWindow.isMinimized()) {
              mainWindow.restore();
            }
            mainWindow.focus()
          } else {
            mainWindow.hide();
          }
        }
      },
      {
        label: 'Auto-start', type: 'checkbox', click(item) {
          if (item.checked) {
            autoLauncher.enable();
          } else {
            autoLauncher.disable();
          }
        }
      }
    ]);

    mainContextWindow.items[0].checked = true;
    autoLauncher.isEnabled()
    .then((enabled) => {
      mainContextWindow.items[1].checked = enabled;

      mainWindowTray = new Tray(image);
      mainWindowTray.setToolTip('Repertory UI');
      mainWindowTray.setContextMenu(mainContextWindow)
    })
    .catch(() => {
      app.quit();
    });
  }
}

const instanceLock = app.requestSingleInstanceLock();
if (!instanceLock) {
  app.quit()
} else {
  app.on('second-instance', () => {
    if (mainWindow) {
      mainWindow.show();
      if (mainContextWindow) {
        mainContextWindow.items[0].checked = true;
      }
      if (mainWindow.isMinimized()) {
        mainWindow.restore();
      }
      mainWindow.focus()
    }
  });

  app.on('ready', createWindow);

  app.on('window-all-closed', () => {
    // On OS X it is common for applications and their menu bar
    // to stay active until the user quits explicitly with Cmd + Q
    if (process.platform !== 'darwin') {
      app.quit()
    }
  });

  app.on('activate', () => {
    // On OS X it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (mainWindow === null) {
      createWindow()
    }
  });
}

ipcMain.on('check_installed', (event, data) => {
  const dataDirectory = helpers.resolvePath(data.Directory);
  const destination = path.join(dataDirectory, data.Version);
  helpers
  .getMissingDependencies(data.Dependencies)
  .then((dependencies) => {
    let exists = false;
    try {
      exists = fs.existsSync(destination) && fs.lstatSync(destination).isDirectory();
    } catch (e) {
    }
    event.sender.send('check_installed_reply', {
      data: {
        Dependencies: dependencies,
        Exists: exists,
        Success: true,
        Version: data.Version,
      }
    });
  }).catch((e) => {
    event.sender.send('check_installed_reply', {
      data: {
        Dependencies: [],
        Error: e,
        Success: false,
        Version: data.Version,
      }
    });
  });
});

ipcMain.on('delete_file', (event, data) => {
  try {
    if (fs.existsSync(data.FilePath)) {
      fs.unlinkSync(data.FilePath);
    }
  } catch (e) {
  }
});

ipcMain.on('detect_mounts', (event, data) => {
  let driveLetters = {
    Hyperspace: [],
    Sia: [],
  };

  const grabDriveLetters = (hsLocation, siaLocation) => {
    for (let i = 'c'.charCodeAt(0); i <= 'z'.charCodeAt(0); i++) {
      const drive = (String.fromCharCode(i) + ':').toUpperCase();
      if (!(hsLocation.startsWith(drive) || siaLocation.startsWith(drive))) {
        try {
          if (!fs.existsSync(drive)) {
            driveLetters.Hyperspace.push(drive);
            driveLetters.Sia.push(drive);
          }
        } catch (e) {
        }
      }
    }

    if (hsLocation.length > 0) {
      if (!driveLetters.Hyperspace.find((driveLetter) => {
        return driveLetter === hsLocation;
      })) {
        driveLetters.Hyperspace.push(hsLocation);
      }
    }

    if (siaLocation.length > 0) {
      if (!driveLetters.Sia.find((driveLetter) => {
        return driveLetter === siaLocation;
      })) {
        driveLetters.Sia.push(siaLocation);
      }
    }
  };

  const dataDirectory = helpers.resolvePath(data.Directory);
  helpers
    .detectRepertoryMounts(dataDirectory, data.Version)
    .then((results) => {
      let hsLocation = results.Hyperspace.Location;
      let siaLocation = results.Sia.Location;
      if (os.platform() === 'win32') {
        hsLocation = hsLocation.toUpperCase();
        siaLocation = siaLocation.toUpperCase();
        grabDriveLetters(hsLocation, siaLocation);
      }
      event.sender.send('detect_mounts_reply', {
        data: {
          DriveLetters: driveLetters,
          Locations: {
            Hyperspace: hsLocation,
            Sia: siaLocation,
          },
          Success: true,
          PIDS: {
            Hyperspace: results.Hyperspace.PID,
            Sia: results.Sia.PID,
          }
        }
      });
    })
    .catch((err) => {
      grabDriveLetters('', '');

      event.sender.send('detect_mounts_reply', {
        data: {
          DriveLetters: driveLetters,
          Error: err,
          Success: false,
        }
      });
    });
});

ipcMain.on('download_file', (event, data) => {
  const dataDirectory = helpers.resolvePath(data.Directory);
  const destination = path.join(dataDirectory, data.Filename);
  helpers.downloadFile(data.URL, destination, (progress) => {
    event.sender.send('download_file_progress', {
      data: {
        Destination: destination,
        Progress: progress,
        URL: data.URL,
      }
    });
  }, (success, err) => {
    event.sender.send('download_file_complete', {
      data: {
        Destination: destination,
        Error: err,
        Success: success,
        URL: data.URL,
      }
    });
  });
});

ipcMain.on('extract_release', (event, data) => {
  const dataDirectory = helpers.resolvePath(data.Directory);
  const destination = path.join(dataDirectory, data.Version);
  helpers.mkDirByPathSync(destination);

  const stream = fs.createReadStream(data.Source);
  stream.pipe(unzip.Extract({ path: destination }))
    .on('error', (e) => {
      try {
        helpers.removeDirectoryRecursively(destination);
      } catch (e) {
      }
      stream.close();
      event.sender.send('extract_release_complete', {
        data: {
          Error: e,
          Source: data.Source,
          Success: false,
        }
      });
    })
    .on('finish', () => {
      stream.close();
      event.sender.send('extract_release_complete', {
        data: {
          Source: data.Source,
          Success: true,
        }
      });
    });
});

ipcMain.on('get_platform', (event) => {
  event.sender.send('get_platform_reply', {
    data: os.platform()
  });
});

ipcMain.on('get_state', (event, data) => {
  const dataDirectory = helpers.resolvePath(data);
  helpers.mkDirByPathSync(dataDirectory);
  const configFile = path.join(dataDirectory, 'settings.json');
  if (fs.existsSync(configFile)) {
    event.sender.send('get_state_reply', {
      data: JSON.parse(fs.readFileSync(configFile, 'utf8')),
    });
  } else {
    event.sender.send('get_state_reply', {
      data: null,
    });
  }
});

ipcMain.on('grab_releases', (event) => {
  event.sender.send('grab_releases_reply');
});

ipcMain.on('grab_ui_releases', (event) => {
  event.sender.send('grab_ui_releases_reply');
});

ipcMain.on('install_dependency', (event, data) => {
  helpers
    .executeAndWait(data.Source)
    .then(()=> {
      event.sender.send('install_dependency_reply', {
        data: {
          Source: data.Source,
          Success: true,
        }
      });
    })
    .catch((e)=> {
      event.sender.send('install_dependency_reply', {
        data: {
          Error: e,
          Source: data.Source,
          Success: false,
        }
      });
    });
});

ipcMain.on('install_upgrade', (event, data) => {
  helpers
    .executeAsync(data.Source)
    .then(()=> {
      mainWindow.close();
    })
    .catch((e)=> {
      event.sender.send('install_upgrade_reply', {
        data: {
          Error: e,
          Source: data.Source,
          Success: false,
        }
      });
    });
});

ipcMain.on('mount_drive', (event, data) => {
  const dataDirectory = helpers.resolvePath(data.Directory);
  const errorHandler = (pid) => {
    mountedPIDs.splice(mountedPIDs.indexOf(pid), 1);
    event.sender.send('unmount_drive_reply', {
      data: {
        PID: -1,
        StorageType: data.StorageType,
        Success: false,
      }
    });
  };
  helpers.executeMount(dataDirectory, data.Version, data.StorageType, data.Location, (_, pid)=> {
    errorHandler(pid);
  })
  .then(pid=> {
    if (pid !== -1) {
      mountedPIDs.push(pid);
    }
    event.sender.send('mount_drive_reply', {
      data: {
        PID: pid,
        StorageType: data.StorageType,
        Success: true,
      }
    });
  })
  .catch((_, pid) => {
    errorHandler(pid);
  });
});

ipcMain.on('save_state', (event, data) => {
  const dataDirectory = helpers.resolvePath(data.Directory);
  helpers.mkDirByPathSync(dataDirectory);
  const configFile = path.join(dataDirectory, 'settings.json');
  fs.writeFileSync(configFile, JSON.stringify(data.State), 'utf8');
});

ipcMain.on('unmount_drive', (event, data) => {
  helpers.stopProcessByPID(data.PID)
  .then((pid)=> {
    if (mountedPIDs.indexOf(pid) === -1) {
      event.sender.send('unmount_drive_reply');
    }
  })
  .catch((e) => {
    console.log(e);
  });
});