using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data.SQLite;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows.Threading;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Win32;

namespace DbReload;

public partial class MainViewModel : ObservableObject
{
    [ObservableProperty] private string _sqLiteFile = "";
    [ObservableProperty] private string[] _logFiles = [];
    [ObservableProperty] private string _progress = "";
    [ObservableProperty] private List<string> _log = new();

    [RelayCommand]
    private void CreateSQLiteFile()
    {
        OpenFileDialog dlg = new OpenFileDialog();
        dlg.Filter = "SQLite Files (*.db,*.dbs)|*.db;*.dbs";
        dlg.CheckFileExists = false;
        if (dlg.ShowDialog() == true)
            SqLiteFile = dlg.FileName;
    }

    [RelayCommand]
    private void SelectLogFiles()
    {
        OpenFileDialog dlg = new OpenFileDialog();
        dlg.Filter = "SQL Log Files (*.sql)|*.sql";
        dlg.Multiselect = true;
        if (dlg.ShowDialog() == true)
            LogFiles = dlg.FileNames;
    }
    
    [RelayCommand]
    private async Task Go()
    {
        Progress = "Opening Database File";

        Log.Clear();

        var sb = new SQLiteConnectionStringBuilder();
        sb.DataSource = SqLiteFile;
        sb.Version = 3;
        sb.DateTimeFormat = SQLiteDateFormats.Ticks;
        sb.JournalMode = SQLiteJournalModeEnum.Wal;
        
        var conn = sb.ToString();

        using var connection = new SQLiteConnection(conn);
        connection.BusyTimeout = Convert.ToInt32(TimeSpan.FromMinutes(2).TotalMilliseconds);
        connection.Update += _connection_Update;
        connection.Trace += _connection_Trace;

        connection.Open();
        using var command = new SQLiteCommand(connection);
        var ordered = LogFiles.OrderBy(x => x);
        foreach (var logfile in ordered)
        {
            Progress = $"Opening {Path.GetFileName(logfile)}";
            var text = await File.ReadAllTextAsync(logfile).ConfigureAwait(false);
            var statements = SqlTokenizer.SplitStatements(text);
            int i = 0;
            foreach (var line in statements)
            {
                Progress = $"Processing {Path.GetFileName(logfile)} ({i}/{statements.Count})";
                
                command.CommandText = line;
                try
                {
                    await command.ExecuteNonQueryAsync();
                }
                catch (Exception e)
                {
                    Log.Add($"{Path.GetFileName(logfile)}: \"{e.Message}\" in \"{line}\"");
                    Console.WriteLine(e);
                    //throw;
                }
                
                i++;
            }
        }

        var logFile = Path.Combine(
            Path.GetDirectoryName(Assembly.GetEntryAssembly()!.Location) ?? "",
            "log.txt");
        await File.AppendAllLinesAsync(logFile, new string[] { "", $"Reload at {DateTime.Now:yyyy-MM-dd hh\\:mm\\:ss}" }.Concat(Log));

        Progress = "Done";
    }

    private void _connection_Update(object sender, UpdateEventArgs e)
    {
    }

    private void _connection_Trace(object sender, TraceEventArgs e)
    {
        Console.WriteLine(e.Statement);
    }
}