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using EyesAndEars.UWP.Models;
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using System;
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using System.Diagnostics;
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using System.Text.Json;
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using System.Threading.Tasks;
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using Windows.Storage;
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using Windows.UI;
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using Windows.UI.Xaml.Media;
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namespace EyesAndEars.UWP.Services {
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public static class DataServices {
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public static async Task<Device> UpdateDevice(string url, int deviceId) {
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try {
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var id = MapFactoryDeviceToGalleyDevice(deviceId); // Has note.
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var readingAPI = $"{url}/api/readings/latest/{id}";
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var statusAPI = $"{url}/api/status/latest/{deviceId}";
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var readingJSON = await WebServices.GetJSON(readingAPI);
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var statusJSON = await WebServices.GetJSON(statusAPI);
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var r = MapToLightReading(readingJSON);
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var s = MapToDeviceStatus(statusJSON);
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var c = UpdateStatusColour(s.status, r.reading);
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return new Device(deviceId, r, s, c);
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}
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catch (Exception e) {
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Debug.WriteLine(e.Message);
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return CreateFallBackDevice(deviceId);
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}
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}
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static SolidColorBrush UpdateStatusColour(string status, int reading) {
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try {
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if (status.Equals("on", StringComparison.OrdinalIgnoreCase)) {
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/* Note: Reading values breakdown.
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* =======================================
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* 1. When testing the light meters, the base line for normal
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* light is 48 or below. Anything above this is when one of
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* the guys in the factory was welding. Becuase of this,
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* I have set 0 to 48 as the 'default' status on the
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* dashboard.
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*
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* 2. During testing we noticed the light meters would
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* return 'negative light' values. There is a reason for
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* this but that is out of the scope of this project. This
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* project just needs to process the data. The negative
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* light values are when the lights in the factory are off.
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* The light meter is still running but there is no light
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* to measure. So, everything is fine but it looks broken.
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* The 'LightSkyBlue' colour is used to help relay this
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* bit of information.
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*/
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if (reading > 0 && reading < 48) // On but no weld detected.
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return new SolidColorBrush(Colors.LightSeaGreen);
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if (reading > 48) // On and weld detected.
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return new SolidColorBrush(Colors.DarkSeaGreen);
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else {
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// On but factory lights are off.
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return new SolidColorBrush(Colors.LightSkyBlue);
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}
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}
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else return new SolidColorBrush(Colors.DarkRed); }
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catch (Exception e) {
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Debug.WriteLine(e.Message);
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return new SolidColorBrush(Colors.DarkOrange);
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}
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}
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/* Note: The Purpose of Mapping a Factory to a Gallery Device.
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* ================================================================
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* Every device in the project is paired up with another.
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* Factory1 => Gallery1 | Device1 => Device4
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* Factory2 => Gallery2 | Device2 => Device5
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* Factory3 => Gallery3 | Device3 => Device6 (Note in use at this time)
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* At the moment, when a device completes a status update, each one
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* is ran throught the "UpdateDevice" function (above). This means
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* the latest light reading for a light meter (factory) must be
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* retrieved when a galley-based device's status is updated.
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* From a strict point-of-view, the gallery device does not need it
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* so I should/could seperate out this functionality into seperate
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* functions. For now though, a light reading is still needed to be
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* retrieved because of the way the functions are called.
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* This function just maps/pairs the (factory) light reading to the
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* appropriate gallery device. By doing this, the gallery device
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* has extra information on its paired up light meter. One way I
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* have used that information is to show a small piece of text in
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* the gallery status box to quickly check the accuracy of the
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* synchronisation between the factory and gallery devices.
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*/
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static int MapFactoryDeviceToGalleyDevice(int deviceId) {
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int id = 0;
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if (deviceId > 3) {
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switch (deviceId) {
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case 4:
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id = 1;
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break;
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case 5:
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id = 2;
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break;
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case 6:
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id = 3;
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break;
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default:
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break;
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}
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}
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else {
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id = deviceId;
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}
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return id;
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}
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static LightReading MapToLightReading(string json) {
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try {
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var reading = JsonSerializer.Deserialize<LightReading>(json);
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return reading;
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}
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catch (Exception e) {
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Debug.WriteLine(e.Message);
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return CreateDefaultLightReading();
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}
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}
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static DeviceStatus MapToDeviceStatus(string json) {
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try {
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var status = JsonSerializer.Deserialize<DeviceStatus>(json);
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return status;
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}
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catch (Exception e) {
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Debug.WriteLine(e.Message);
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return CreateDefaultDeviceStatus();
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}
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}
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public static Device CreateFallBackDevice(int deviceId) {
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// "999" and "err" are acting as sentinals in this context.
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var r = new LightReading { id = 0, reading = 999, time = DateTime.Now };
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var s = new DeviceStatus { id = 0, status = "err", time = DateTime.Now };
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var c = new SolidColorBrush(Colors.DarkOrange);
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var d = new Device(deviceId, r, s, c);
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return d;
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}
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static LightReading CreateDefaultLightReading() =>
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new LightReading { id = 0, reading = 999, time = DateTime.Now };
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static DeviceStatus CreateDefaultDeviceStatus() =>
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new DeviceStatus { id = 0, status = "err", time = DateTime.Now };
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public static async Task SaveBaseURLAsync(string contents) {
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try {
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var storageFolder = ApplicationData.Current.LocalFolder;
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var baseURLFile = await storageFolder.CreateFileAsync("baseURL.txt",
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CreationCollisionOption.ReplaceExisting);
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await FileIO.WriteTextAsync(baseURLFile, contents);
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}
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catch (Exception e) {
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Debug.WriteLine(e.Message);
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}
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}
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public static async Task<string> GetBaseURLAsync() {
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try {
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var storageFolder = ApplicationData.Current.LocalFolder;
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var baseURLFile = await storageFolder.GetFileAsync("baseURL.txt");
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var text = await FileIO.ReadTextAsync(baseURLFile);
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return text;
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}
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catch (Exception e) {
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Debug.WriteLine(e.Message);
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return "";
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}
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}
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}
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}
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