using Microsoft.Win32;
using StationProbe;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;

namespace TestViewer
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private readonly Database _db;
        private int _pageIndex = -1;
        private int _pageCount = 0;

        public MainWindow()
        {
            InitializeComponent();
            var fileDialog = new OpenFileDialog();
            fileDialog.Title = "Open database file";
            fileDialog.Filter = "*.db|*.db";
            if(fileDialog.ShowDialog() == true)
            {
                _db = new Database(fileDialog.FileName);
                PageIndex.Text = $"{_pageIndex + 1}/{_pageCount}";
                var batchTasks = _db.GetBatchTasks();
                foreach (var task in batchTasks)
                {
                    BatchTaskList.Items.Add(task);
                }
                BatchTaskList.SelectionChanged += OnBatchTaskSelectionChanged;
                ExamList.SelectionChanged += OnExamSelectionChanged;
            }
            else
            {
                Application.Current.Shutdown(0);
            }           
        }

        private void OnBatchTaskSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var batchTask = BatchTaskList.SelectedValue as BatchTask;
            if (batchTask != null)
            {
                var lastExam = _db.GetLastExam(batchTask.Id);
                if (lastExam != null)
                {
                    _pageIndex = 0;
                    _pageCount = lastExam.PageIndex + 1;
                    var exams = _db.GetExams(batchTask.Id, _pageIndex);
                    foreach (var exam in exams)
                    {
                        ExamList.Items.Add(exam);
                    }
                    PageIndex.Text = $"{_pageIndex + 1}/{_pageCount}";
                }
            }
        }

        private void OnExamSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ExamContent.Children.Clear();
            if (ExamList.SelectedValue != null)
            {
                var exam = ExamList.SelectedValue as Exam;
                if (exam != null)
                {
                    ExamContent.Children.Add(new TextBlock() 
                    {
                        Margin = new Thickness(16),
                        Text = exam.Report, 
                        FontSize = 20, 
                        TextWrapping = TextWrapping.Wrap 
                    });
                    var images = _db.GetImages(exam.Id);
                    foreach (var image in images)
                    {
                        var img = new BitmapImage();
                        img.BeginInit();
                        img.StreamSource = new MemoryStream(image.Data);
                        img.EndInit();
                        ExamContent.Children.Add(new System.Windows.Controls.Image() 
                        { 
                            Margin = new Thickness(4),
                            Source = img 
                        });
                    }
                }
            }
        }

        private void OnNextPageClick(object sender, RoutedEventArgs e)
        {
            if (_pageIndex < _pageCount - 1)
            {
                var batchTask = BatchTaskList.SelectedValue as BatchTask;
                if (batchTask != null)
                {
                    ExamList.Items.Clear();
                    _pageIndex++;
                    var exams = _db.GetExams(batchTask.Id, _pageIndex);
                    foreach (var exam in exams)
                    {
                        ExamList.Items.Add(exam);
                    }
                    PageIndex.Text = $"{_pageIndex + 1}/{_pageCount}";
                }
            }
        }

        private void OnPreviousPageClick(object sender, RoutedEventArgs e)
        {
            if (_pageIndex > 0)
            {
                var batchTask = BatchTaskList.SelectedValue as BatchTask;
                if (batchTask != null)
                {
                    ExamList.Items.Clear();
                    _pageIndex--;
                    var exams = _db.GetExams(batchTask.Id, _pageIndex);
                    foreach (var exam in exams)
                    {
                        ExamList.Items.Add(exam);
                    }
                    PageIndex.Text = $"{_pageIndex + 1}/{_pageCount}";
                }
            }
        }
    }
}