ilyalehchylin/educats-xamarin

using EduCATS.Constants;
using EduCATS.Data.Models;
using EduCATS.Helpers.Forms;
using EduCATS.Helpers.Forms.Styles;
using EduCATS.Pages.Settings.About.ViewModels;
using EduCATS.Themes;
using FFImageLoading.Forms;
using Nyxbull.Plugins.CrossLocalization;
using System.Collections.Generic;
using Xamarin.Forms;

namespace EduCATS.Pages.Settings.About.Views
{
    public class AboutPageView : ContentPage
    {
        static Thickness _padding = new Thickness(20);
        static Thickness _buttonsPadding = new Thickness(0, 0, 0, 10);
        const double _spacing = 20;
        const double _buttonHeight = 50;

        public AboutPageView()
        {
            NavigationPage.SetHasNavigationBar(this, false);
            Padding = _padding;
            BackgroundColor = Color.FromHex(Theme.Current.AppBackgroundColor);
            BindingContext = new AboutPageViewModel(new PlatformServices());
            createViews();
        }

        void createViews()
        {
            Content = new StackLayout
            {
                Spacing = _spacing,
                Padding = _buttonsPadding,
                Children = {
                    createHeader(),
                    createBodyLayout()
                }
            };
        }

        StackLayout createBodyLayout()
        {
            var releaseNotesButton = createButton(
                CrossLocalization.Translate("settings_about_release_notes"),
                "ReleaseNotesCommand");

            var sendLogsButton = createButton(
                CrossLocalization.Translate("settings_about_send_logs"),
                "SendLogsCommand");

            var openGithubButton = createButton(
                CrossLocalization.Translate("settings_about_open_source"),
                "OpenSourceCommand");

            var openWebPageButton = createButton(
                CrossLocalization.Translate("settings_about_open_web_version"),
                "OpenWebSiteCommand");

            return new StackLayout
            {
                VerticalOptions = LayoutOptions.FillAndExpand,
                Children = {
                    releaseNotesButton,
                    sendLogsButton,
                    openGithubButton,
                    openWebPageButton,
                    createContributorsBlock()
                }
            };
        }

        StackLayout createHeader()
        {
            var logo = createLogo();
            var rightLayout = createRightLayout();

            return new StackLayout
            {
                Spacing = _spacing,
                Orientation = StackOrientation.Horizontal,
                Children = { logo, rightLayout }
            };
        }

        CachedImage createLogo()
        {
            return new CachedImage
            {
                HeightRequest = 100,
                VerticalOptions = LayoutOptions.StartAndExpand,
                Source = Theme.Current.BaseLogoImage
            };
        }

        StackLayout createRightLayout()
        {
            var nameLabel = createRightLabelLayout(GlobalConsts.AppName, namedSize: NamedSize.Large);

            var appVersionLabel = createRightLabelLayout(
                $"{CrossLocalization.Translate("settings_about_app_version")}: ",
                "Version");

            var appBuildLabel = createRightLabelLayout(
                $"{CrossLocalization.Translate("settings_about_app_build")}: ",
                "Build");

            return new StackLayout
            {
                VerticalOptions = LayoutOptions.StartAndExpand,
                Children = {
                    nameLabel,
                    appVersionLabel,
                    appBuildLabel
                }
            };
        }

        Label createRightLabelLayout(
            string title, string bindingProperty = null, NamedSize namedSize = NamedSize.Medium)
        {
            var color = Color.FromHex(Theme.Current.AboutTextColor);

            var leftSpan = new Span
            {
                Text = title,
                ForegroundColor = color,
                FontAttributes = FontAttributes.Bold,
                Style = AppStyles.GetLabelStyle(namedSize, true)
            };

            var formattedString = new FormattedString
            {
                Spans = {
                    leftSpan
                }
            };

            if (bindingProperty != null)
            {
                var rightSpan = new Span
                {
                    ForegroundColor = color,
                    Style = AppStyles.GetLabelStyle()
                };

                rightSpan.SetBinding(Span.TextProperty, bindingProperty);
                formattedString.Spans.Add(rightSpan);
            }

            return new Label
            {
                FormattedText = formattedString
            };
        }

        StackLayout createContributorsBlock()
        {
            var contributors = createContributorLabel("settings_about_contributors", true);
            var ilContributor = createContributorLabel("contributor_ilya_lehchylin");
            var jpContributor = createContributorLabel("contributor_julia_popova");

            return new StackLayout
            {
                VerticalOptions = LayoutOptions.EndAndExpand,
                HorizontalOptions = LayoutOptions.CenterAndExpand,
                Children = {
                    contributors,
                    ilContributor,
                    jpContributor
                }
            };
        }

        Label createContributorLabel(string localizedKey, bool bold = false)
        {
            return new Label
            {
                Style = AppStyles.GetLabelStyle(bold: bold),
                HorizontalTextAlignment = TextAlignment.Center,
                Text = CrossLocalization.Translate(localizedKey),
                TextColor = Color.FromHex(Theme.Current.AboutTextColor)
            };
        }

        Button createButton(string text, string commandProperty)
        {
            var button = new Button
            {
                Text = text,
                HeightRequest = _buttonHeight,
                Style = AppStyles.GetButtonStyle(),
                TextColor = Color.FromHex(Theme.Current.AboutButtonTextColor),
                VerticalOptions = LayoutOptions.Start,
                BackgroundColor = Color.FromHex(Theme.Current.AboutButtonBackgroundColor)
            };

            button.SetBinding(Button.CommandProperty, commandProperty);
            return button;
        }
    }
}