// (c) 2014 Don Coleman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/* global mainPage, deviceList, refreshButton */
/* global detailPage, batteryState, batteryStateButton, disconnectButton */
/* global ble  */
/* jshint browser: true , devel: true*/
'use strict';

var battery = {
    service: "180F",
    level: "2A19"
};

var app = {
    initialize: function() {
        this.bindEvents();
        detailPage.hidden = true;
    },
    bindEvents: function() {
        document.addEventListener('deviceready', this.onDeviceReady, false);
        refreshButton.addEventListener('touchstart', this.refreshDeviceList, false);
        batteryStateButton.addEventListener('touchstart', this.readBatteryState, false);
        disconnectButton.addEventListener('touchstart', this.disconnect, false);
        deviceList.addEventListener('touchstart', this.connect, false); // assume not scrolling
    },
    onDeviceReady: function() {
        app.refreshDeviceList();
    },
    refreshDeviceList: function() {
        deviceList.innerHTML = ''; // empties the list
        // scan for all devices
        ble.scan([], 5, app.onDiscoverDevice, app.onError);
    },
    onDiscoverDevice: function(device) {

        console.log(JSON.stringify(device));
        var listItem = document.createElement('li'),
            html = '<b>' + device.name + '</b><br/>' +
                'RSSI: ' + device.rssi + '&nbsp;|&nbsp;' +
                device.id;

        listItem.dataset.deviceId = device.id;  // TODO
        listItem.innerHTML = html;
        deviceList.appendChild(listItem);

    },
    connect: function(e) {
        var deviceId = e.target.dataset.deviceId,
            onConnect = function() {

                // TODO check if we have the battery service
                // TODO check if the battery service can notify us
                //ble.startNotification(deviceId, battery.service, battery.level, app.onBatteryLevelChange, app.onError);
                batteryStateButton.dataset.deviceId = deviceId;
                disconnectButton.dataset.deviceId = deviceId;
                app.showDetailPage();
            };

        ble.connect(deviceId, onConnect, app.onError);
    },
    onBatteryLevelChange: function(data) {
        console.log(data);
        var message;
        var a = new Uint8Array(data);
        batteryState.innerHTML = a[0];
    },
    readBatteryState: function(event) {
        console.log("readBatteryState");
        var deviceId = event.target.dataset.deviceId;
        ble.read(deviceId, battery.service, battery.level, app.onReadBatteryLevel, app.onError);
    },
    onReadBatteryLevel: function(data) {
        console.log(data);
        var message;
        var a = new Uint8Array(data);
        batteryState.innerHTML = a[0];
    },
    disconnect: function(event) {
        var deviceId = event.target.dataset.deviceId;
        ble.disconnect(deviceId, app.showMainPage, app.onError);
    },
    showMainPage: function() {
        mainPage.hidden = false;
        detailPage.hidden = true;
    },
    showDetailPage: function() {
        mainPage.hidden = true;
        detailPage.hidden = false;
    },
    onError: function(reason) {
        alert("ERROR: " + reason); // real apps should use notification.alert
    }
};