using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Controls;
using DTS.Common.Classes.Groups;
using DTS.Common.Interface.Groups;
using DTS.Common.Strings;
using GroupImport.Resources;

namespace GroupImport
{
    /// <summary>
    /// Interaction logic for GroupImportOptionsView.xaml
    /// </summary>
    public partial class GroupImportPreviewView : IGroupImportPreviewView
    {
        public GroupImportPreviewView()
        {
            InitializeComponent();
        }

        /// <summary>
        /// handles when tb group name changes
        /// in this case the UI needs to be notified and the validity of the group name may change
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void GroupName_Changed(object sender, System.Windows.Controls.TextChangedEventArgs e)
        {
            var tb = (TextBox)sender;

            var group = (GroupGRPImportGroup)tb.DataContext;

            group.GroupName = tb.Text;

            foreach (var ch in group.Channels)
            {
                ch.GroupNameInvalidate();
            }

            var vm = (GroupImportViewModel)DataContext;
            vm.CheckGroupName();
        }
        /// <summary>
        /// handles when tb group tag changes
        /// in this case the UI needs to be notified and the validity of the group tag may change
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void GroupTags_Changed(object sender, System.Windows.Controls.TextChangedEventArgs e)
        {
            var tb = (TextBox)sender;

            var group = (GroupGRPImportGroup)tb.DataContext;

            group.GroupTags = tb.Text;
        }
        /// <summary>
        /// handles included checkbox being checked for a group
        /// in this case the channels for the group should be added to the UI
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void IncludedChecked(object sender, System.Windows.RoutedEventArgs e)
        {
            var vm = (GroupImportViewModel)DataContext;
            vm.InvalidateChannels();
        }
        /// <summary>
        /// handles the included checkbox being unchecked for a group
        /// in this case the channels for the group should be removed from the UI
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void IncludedUnchecked(object sender, System.Windows.RoutedEventArgs e)
        {
            var vm = (GroupImportViewModel)DataContext;
            vm.InvalidateChannels();
        }
        /// <summary>
        /// checks whether it is okay to proceed to import,
        /// checks the validity of the selected channels and groups
        /// </summary>
        /// <param name="userIsAdmin">whether or not the user has Administrator privileges</param>
        /// <param name="errors">any fatal errors that would prevent importing</param>
        /// <param name="warnings">any non fatal errors that the user needs to be warned about (but that don't prevent importing)</param>
        /// <returns>true if it is okay to proceed to import</returns>
        public bool Validate(bool userIsAdmin, out List<string> errors, out List<string> warnings)
        {
            errors = new List<string>();
            warnings = new List<string>();
            var bValid = true;

            var vm = (GroupImportViewModel)DataContext;
            var bAnyValidChannels = false;
            if (vm.Groups.Any())
            {
                foreach (var g in vm.Groups)
                {
                    if (!g.Included) { continue; }
                    if (!string.IsNullOrWhiteSpace(g.GroupTags) && !userIsAdmin)
                    {
                        foreach (var userTag in g.ImportingUserTags.Split())
                        {
                            if (g.GroupTags.Split().Contains(userTag)) continue;

                            var sb = new StringBuilder();
                            sb.Append(string.Format(StringResources.PreviewGroups_WontSaveWithIncompatibleTags, userTag, g.GroupTags));
                            sb.Append($"\r\n{StringResources.UserTags}");
                            sb.Append(g.ImportingUserTags.Length == 0 ? StringResources.None : g.ImportingUserTags);
                            //The static group in question will always have at least 1 Tag, otherwise there would be no problem
                            sb.Append($"\r\n{StringResources.GroupTags}");
                            sb.Append(g.GroupTags);

                            errors.Add(sb.ToString());
                            return false;
                        }
                    }
                    if (g.GroupNameHasError)
                    {
                        var msg = string.Format(StringResources.Preview_InvalidName, g.GroupName);
                        if (!errors.Contains(msg))
                        {
                            errors.Add(msg);
                        }
                        return false;
                    }
                    if (null != g.GroupErrors && g.GroupErrors.Any())
                    {
                        foreach (var error in g.GroupErrors)
                        {
                            if (!errors.Contains(error.ExtraInfo))
                            {
                                errors.Add(error.ExtraInfo);
                            }
                        }
                        return false;
                    }
                    if (vm.CheckGroupExists(g.GroupName) && !g.Overwrite)
                    {
                        var msg = string.Format(StringResources.Preview_InvalidName, g.GroupName);
                        if (!errors.Contains(msg)) { errors.Add(msg); }
                        return false;
                    }
                    bValid = false;
                    foreach (var ch in g.Channels)
                    {
                        if (null != ch.Error)
                        {
                            switch (ch.Error.ErrorCode)
                            {
                                case GroupGRPImportError.Errors.FileEmpty:
                                case GroupGRPImportError.Errors.InvalidISOCodeInput:
                                    bAnyValidChannels = true;
                                    break;
                                case GroupGRPImportError.Errors.InvalidFullScaleInput:
                                    warnings.Add(string.Format(StringResources.Preview_InvalidFullScaleInput,
                                        g.GroupName, ch.DisplayName));
                                    bAnyValidChannels = true;
                                    break;
                                case GroupGRPImportError.Errors.InvalidInvertInput:
                                    warnings.Add(string.Format(StringResources.Preview_InvalidSensorInput,
                                        g.GroupName,
                                        ch.DisplayName));
                                    bAnyValidChannels = true;
                                    break;
                                case GroupGRPImportError.Errors.InvalidSensorInput:
                                    var msg = string.Format(StringResources.Preview_InvalidRow, g.GroupName);
                                    if (!warnings.Contains(msg))
                                    {
                                        warnings.Add(msg);
                                    }
                                    break;
                                case GroupGRPImportError.Errors.SensorNotFound:
                                    warnings.Add(string.Format(StringResources.Preview_InvalidSensor, g.GroupName,
                                        ch.DisplayName));
                                    break;
                                default:
                                    throw new ArgumentOutOfRangeException();
                            }
                        }
                        else
                        {
                            bValid = true;
                            bAnyValidChannels = true;
                        }
                    }
                }
                if (!bAnyValidChannels)
                {
                    errors.Add(StringResources.Preview_NoGroupsToImport);
                }
                return bValid;
            }
            errors.Add(StringResources.Preview_NoGroupsToImport);
            return false;
        }
    }
}