using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using AxCopilot.Models;

namespace AxCopilot.Views;

public partial class ChatWindow
{
    /// <summary>좋아요/싫어요 피드백 버튼을 생성합니다.</summary>
    private Button CreateFeedbackButton(
        string iconGlyph,
        string tooltip,
        Brush normalColor,
        Brush activeColor,
        Func<bool> isActive,
        Action toggle)
    {
        var hoverBrush = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
        var activeBackground = TryFindResource("ItemHoverBackground") as Brush
                               ?? new SolidColorBrush(Color.FromArgb(18, 255, 255, 255));

        var icon = new TextBlock
        {
            Text = iconGlyph,
            FontFamily = new FontFamily("Segoe MDL2 Assets"),
            FontSize = 12,
            Foreground = normalColor,
            VerticalAlignment = VerticalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center,
            RenderTransformOrigin = new Point(0.5, 0.5),
            RenderTransform = new ScaleTransform(1, 1)
        };

        var chip = new Border
        {
            Background = Brushes.Transparent,
            BorderBrush = Brushes.Transparent,
            BorderThickness = new Thickness(1),
            CornerRadius = new CornerRadius(8),
            Padding = new Thickness(6, 4, 6, 4),
            Margin = new Thickness(0, 0, 4, 0),
            Child = icon
        };

        var btn = new Button
        {
            Content = chip,
            Background = Brushes.Transparent,
            BorderThickness = new Thickness(0),
            Cursor = Cursors.Hand,
            Padding = new Thickness(0),
            ToolTip = tooltip
        };

        void RefreshVisual()
        {
            var active = isActive();
            icon.Foreground = active ? activeColor : normalColor;
            chip.Background = active ? activeBackground : Brushes.Transparent;
            chip.BorderBrush = active ? activeColor : Brushes.Transparent;
        }

        RefreshVisual();

        btn.MouseEnter += (_, _) =>
        {
            if (!isActive())
                icon.Foreground = hoverBrush;
        };
        btn.MouseLeave += (_, _) =>
        {
            if (!isActive())
                icon.Foreground = normalColor;
        };
        btn.Click += (_, _) =>
        {
            toggle();
            RefreshVisual();

            var scale = (ScaleTransform)icon.RenderTransform;
            var bounce = new DoubleAnimation(1.3, 1.0, TimeSpan.FromMilliseconds(250))
            {
                EasingFunction = new ElasticEase
                {
                    EasingMode = EasingMode.EaseOut,
                    Oscillations = 1,
                    Springiness = 5
                }
            };
            scale.BeginAnimation(ScaleTransform.ScaleXProperty, bounce);
            scale.BeginAnimation(ScaleTransform.ScaleYProperty, bounce);
        };

        return btn;
    }

    /// <summary>좋아요/싫어요 버튼을 상호배타 토글로 추가합니다.</summary>
    private void AddLinkedFeedbackButtons(StackPanel actionBar, Brush btnColor, ChatMessage? message)
    {
        string? currentFeedback = message?.Feedback;

        void PersistFeedback()
        {
            if (message == null)
                return;

            try
            {
                var feedback = string.IsNullOrWhiteSpace(currentFeedback) ? null : currentFeedback;
                var session = ChatSession;
                if (session != null)
                {
                    lock (_convLock)
                    {
                        session.UpdateMessageFeedback(_activeTab, message, feedback, _storage);
                        _currentConversation = session.CurrentConversation;
                    }
                }
                else
                {
                    message.Feedback = feedback;
                    ChatConversation? conv;
                    lock (_convLock)
                    {
                        conv = _currentConversation;
                    }

                    if (conv != null)
                        _storage.Save(conv);
                }
            }
            catch
            {
            }
        }

        var likeBtn = CreateFeedbackButton(
            "\uE8E1",
            "좋아요",
            btnColor,
            new SolidColorBrush(Color.FromRgb(0x38, 0xA1, 0x69)),
            () => string.Equals(currentFeedback, "like", StringComparison.OrdinalIgnoreCase),
            () =>
            {
                currentFeedback = string.Equals(currentFeedback, "like", StringComparison.OrdinalIgnoreCase)
                    ? null
                    : "like";
                PersistFeedback();
            });

        var dislikeBtn = CreateFeedbackButton(
            "\uE8E0",
            "싫어요",
            btnColor,
            new SolidColorBrush(Color.FromRgb(0xE5, 0x3E, 0x3E)),
            () => string.Equals(currentFeedback, "dislike", StringComparison.OrdinalIgnoreCase),
            () =>
            {
                currentFeedback = string.Equals(currentFeedback, "dislike", StringComparison.OrdinalIgnoreCase)
                    ? null
                    : "dislike";
                PersistFeedback();
            });

        actionBar.Children.Add(likeBtn);
        actionBar.Children.Add(dislikeBtn);
    }

    private TextBlock? CreateAssistantMessageMetaText(ChatMessage? message)
    {
        if (message == null)
        {
            return null;
        }

        var parts = new List<string>();
        if (message.ResponseElapsedMs is > 0)
        {
            var elapsedMs = message.ResponseElapsedMs.Value;
            parts.Add(elapsedMs < 1000
                ? $"{elapsedMs}ms"
                : $"{(elapsedMs / 1000.0):0.0}s");
        }

        if (message.PromptTokens > 0 || message.CompletionTokens > 0)
        {
            var totalTokens = message.PromptTokens + message.CompletionTokens;
            parts.Add($"{FormatTokenCount(totalTokens)} tokens");
        }

        if (parts.Count == 0)
        {
            return null;
        }

        return new TextBlock
        {
            Text = string.Join("  •  ", parts),
            FontSize = 9.75,
            Foreground = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray,
            HorizontalAlignment = HorizontalAlignment.Left,
            Margin = new Thickness(4, 2, 0, 0),
            Opacity = 0.72,
        };
    }

    private static void ApplyMessageEntryAnimation(FrameworkElement element)
    {
        element.Opacity = 0;
        element.RenderTransform = new TranslateTransform(0, 16);
        element.BeginAnimation(UIElement.OpacityProperty,
            new DoubleAnimation(0, 1, TimeSpan.FromMilliseconds(350))
            {
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
            });
        ((TranslateTransform)element.RenderTransform).BeginAnimation(
            TranslateTransform.YProperty,
            new DoubleAnimation(16, 0, TimeSpan.FromMilliseconds(400))
            {
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
            });
    }

    private bool _isEditing;

    private void EnterEditMode(StackPanel wrapper, string originalText)
    {
        if (_isStreaming || _isEditing)
        {
            return;
        }

        _isEditing = true;
        var idx = MessagePanel.Children.IndexOf(wrapper);
        if (idx < 0)
        {
            _isEditing = false;
            return;
        }

        var editPanel = new StackPanel
        {
            HorizontalAlignment = HorizontalAlignment.Right,
            MaxWidth = 540,
            Margin = wrapper.Margin,
        };

        var editBox = new TextBox
        {
            Text = originalText,
            FontSize = 13.5,
            Foreground = TryFindResource("PrimaryText") as Brush ?? Brushes.White,
            Background = TryFindResource("ItemBackground") as Brush ?? Brushes.DarkGray,
            CaretBrush = TryFindResource("AccentColor") as Brush ?? Brushes.Blue,
            BorderBrush = TryFindResource("AccentColor") as Brush ?? Brushes.Blue,
            BorderThickness = new Thickness(1.5),
            Padding = new Thickness(14, 10, 14, 10),
            TextWrapping = TextWrapping.Wrap,
            AcceptsReturn = false,
            MaxHeight = 200,
            VerticalScrollBarVisibility = ScrollBarVisibility.Auto,
        };
        var editBorder = new Border
        {
            CornerRadius = new CornerRadius(14),
            Child = editBox,
            ClipToBounds = true,
        };
        editPanel.Children.Add(editBorder);

        var btnBar = new StackPanel
        {
            Orientation = Orientation.Horizontal,
            HorizontalAlignment = HorizontalAlignment.Right,
            Margin = new Thickness(0, 6, 0, 0),
        };

        var accentBrush = TryFindResource("AccentColor") as Brush ?? Brushes.Blue;
        var secondaryBrush = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;

        var cancelBtn = new Button
        {
            Content = new TextBlock { Text = "취소", FontSize = 12, Foreground = secondaryBrush },
            Background = Brushes.Transparent,
            BorderThickness = new Thickness(0),
            Cursor = Cursors.Hand,
            Padding = new Thickness(12, 5, 12, 5),
            Margin = new Thickness(0, 0, 6, 0),
        };
        cancelBtn.Click += (_, _) =>
        {
            _isEditing = false;
            if (idx >= 0 && idx < MessagePanel.Children.Count)
            {
                MessagePanel.Children[idx] = wrapper;
            }
        };
        btnBar.Children.Add(cancelBtn);

        var sendBtn = new Button
        {
            Cursor = Cursors.Hand,
            Padding = new Thickness(0),
        };
        sendBtn.Template = (ControlTemplate)System.Windows.Markup.XamlReader.Parse(
            "<ControlTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' TargetType='Button'>" +
            "<Border Background='" + (accentBrush is SolidColorBrush sb ? sb.Color.ToString() : "#4B5EFC") + "' CornerRadius='8' Padding='12,5,12,5'>" +
            "<TextBlock Text='전송' FontSize='12' Foreground='White' HorizontalAlignment='Center'/>" +
            "</Border></ControlTemplate>");
        sendBtn.Click += (_, _) =>
        {
            var newText = editBox.Text.Trim();
            if (!string.IsNullOrEmpty(newText))
            {
                _ = SubmitEditAsync(idx, newText);
            }
        };
        btnBar.Children.Add(sendBtn);

        editPanel.Children.Add(btnBar);
        MessagePanel.Children[idx] = editPanel;

        editBox.KeyDown += (_, ke) =>
        {
            if (ke.Key == Key.Enter && Keyboard.Modifiers == ModifierKeys.None)
            {
                ke.Handled = true;
                var newText = editBox.Text.Trim();
                if (!string.IsNullOrEmpty(newText))
                {
                    _ = SubmitEditAsync(idx, newText);
                }
            }

            if (ke.Key == Key.Escape)
            {
                ke.Handled = true;
                _isEditing = false;
                if (idx >= 0 && idx < MessagePanel.Children.Count)
                {
                    MessagePanel.Children[idx] = wrapper;
                }
            }
        };

        editBox.Focus();
        editBox.SelectAll();
    }

    private async Task SubmitEditAsync(int bubbleIndex, string newText)
    {
        _isEditing = false;
        if (_isStreaming)
        {
            return;
        }

        ChatConversation conv;
        lock (_convLock)
        {
            if (_currentConversation == null)
            {
                return;
            }

            conv = _currentConversation;
        }

        var userMsgIdx = -1;
        var uiIdx = 0;
        lock (_convLock)
        {
            for (var i = 0; i < conv.Messages.Count; i++)
            {
                if (conv.Messages[i].Role == "system")
                {
                    continue;
                }

                if (uiIdx == bubbleIndex)
                {
                    userMsgIdx = i;
                    break;
                }

                uiIdx++;
            }
        }

        if (userMsgIdx < 0)
        {
            return;
        }

        lock (_convLock)
        {
            var session = ChatSession;
            if (session != null)
            {
                session.UpdateUserMessageAndTrim(_activeTab, userMsgIdx, newText, _storage);
                _currentConversation = session.CurrentConversation;
                conv = _currentConversation!;
            }
            else
            {
                conv.Messages[userMsgIdx].Content = newText;
                while (conv.Messages.Count > userMsgIdx + 1)
                {
                    conv.Messages.RemoveAt(conv.Messages.Count - 1);
                }
            }
        }

        RenderMessages(preserveViewport: true);
        AutoScrollIfNeeded();

        await SendRegenerateAsync(conv);
        try
        {
            if (ChatSession == null)
            {
                _storage.Save(conv);
            }
        }
        catch (Exception ex)
        {
            Services.LogService.Debug($"편집 저장 실패: {ex.Message}");
        }

        RefreshConversationList();
    }
}