using Dalamud.Interface;
using Dalamud.Interface.Colors;
using Dalamud.Interface.Utility;
using Dalamud.Interface.Utility.Raii;
using Dalamud.Interface.Windowing;
using LightlessSync.LightlessConfiguration;
using LightlessSync.LightlessConfiguration.Models;
using LightlessSync.Services;
using LightlessSync.Services.Mediator;
using LightlessSync.UI.Models;
using Microsoft.Extensions.Logging;

using System.Numerics;
using Dalamud.Bindings.ImGui;

namespace LightlessSync.UI;

public class LightlessNotificationUI : WindowMediatorSubscriberBase
{
    private readonly List<LightlessNotification> _notifications = new();
    private readonly object _notificationLock = new();
    private readonly LightlessConfigService _configService;
    
    private const float NotificationWidth = 350f;
    private const float NotificationMinHeight = 60f;
    private const float NotificationMaxHeight = 200f;
    private const float NotificationSpacing = 8f;
    private const float AnimationSpeed = 10f;
    
    private const float EdgeXMargin = 0;
    private const float EdgeYMargin = 30f;
    private const float SlideDistance = 100f;

    public LightlessNotificationUI(ILogger<LightlessNotificationUI> logger, LightlessMediator mediator, PerformanceCollectorService performanceCollector, LightlessConfigService configService) 
        : base(logger, mediator, "Lightless Notifications##LightlessNotifications", performanceCollector)
    {
        _configService = configService;
        Flags = ImGuiWindowFlags.NoDecoration | 
                ImGuiWindowFlags.NoMove | 
                ImGuiWindowFlags.NoResize | 
                ImGuiWindowFlags.NoSavedSettings |
                ImGuiWindowFlags.NoFocusOnAppearing |
                ImGuiWindowFlags.NoNav |
                ImGuiWindowFlags.NoBackground |
                ImGuiWindowFlags.NoCollapse |
                ImGuiWindowFlags.AlwaysAutoResize;
                
        var viewport = ImGui.GetMainViewport();
        if (viewport.WorkSize.X > 0)
        {
            Position = new Vector2(viewport.WorkPos.X + viewport.WorkSize.X - NotificationWidth - EdgeXMargin, 
                                   viewport.WorkPos.Y + EdgeYMargin);
            PositionCondition = ImGuiCond.Always;
        }
        
        Size = new Vector2(NotificationWidth, 100);
        SizeCondition = ImGuiCond.FirstUseEver;
        IsOpen = false;
        RespectCloseHotkey = false;
        DisableWindowSounds = true;
        
        Mediator.Subscribe<LightlessNotificationMessage>(this, HandleNotificationMessage);
        Mediator.Subscribe<LightlessNotificationDismissMessage>(this, HandleNotificationDismissMessage);
    }
    private void HandleNotificationMessage(LightlessNotificationMessage message)
    {
        AddNotification(message.Notification);
    }

    private void HandleNotificationDismissMessage(LightlessNotificationDismissMessage message)
    {
        RemoveNotification(message.NotificationId);
    }

    public void AddNotification(LightlessNotification notification)
    {
        lock (_notificationLock)
        {
            var existingNotification = _notifications.FirstOrDefault(n => n.Id == notification.Id);
            if (existingNotification != null)
            {
                // Update existing notification without restarting animation
                existingNotification.Message = notification.Message;
                existingNotification.Progress = notification.Progress;
                existingNotification.ShowProgress = notification.ShowProgress;
                existingNotification.Title = notification.Title;
                _logger.LogDebug("Updated existing notification: {Title}", notification.Title);
            }
            else
            {
                _notifications.Add(notification);
                _logger.LogDebug("Added new notification: {Title}", notification.Title);
            }
            
            if (!IsOpen)
            {
                IsOpen = true;
            }
        }
    }

    public void RemoveNotification(string id)
    {
        lock (_notificationLock)
        {
            var notification = _notifications.FirstOrDefault(n => n.Id == id);
            if (notification != null)
            {
                notification.IsAnimatingOut = true;
                notification.IsAnimatingIn = false;
            }
        }
    }

    protected override void DrawInternal()
    {
        lock (_notificationLock)
        {
            UpdateNotifications();
            
            if (_notifications.Count == 0)
            {
                IsOpen = false;
                return;
            }

            var viewport = ImGui.GetMainViewport();
            var windowPos = new Vector2(
                viewport.WorkPos.X + viewport.WorkSize.X - NotificationWidth - EdgeXMargin,
                viewport.WorkPos.Y + EdgeYMargin
            );
            ImGui.SetWindowPos(windowPos);

            for (int i = 0; i < _notifications.Count; i++)
            {
                DrawNotification(_notifications[i], i);
                
                if (i < _notifications.Count - 1)
                {
                    ImGui.Dummy(new Vector2(0, NotificationSpacing));
                }
            }
        }
    }

    private void UpdateNotifications()
    {
        var deltaTime = ImGui.GetIO().DeltaTime;
        
        var maxNotifications = _configService.Current.MaxSimultaneousNotifications;
        while (_notifications.Count(n => !n.IsAnimatingOut) > maxNotifications)
        {
            var oldestNotification = _notifications
                .Where(n => !n.IsAnimatingOut)
                .OrderBy(n => n.CreatedAt)
                .FirstOrDefault();
            if (oldestNotification != null)
            {
                oldestNotification.IsAnimatingOut = true;
                oldestNotification.IsAnimatingIn = false;
            }
        }
        for (int i = _notifications.Count - 1; i >= 0; i--)
        {
            var notification = _notifications[i];
            
            if (notification.IsAnimatingIn && notification.AnimationProgress < 1f)
            {
                notification.AnimationProgress = Math.Min(1f, notification.AnimationProgress + deltaTime * AnimationSpeed);
            }
            else if (notification.IsAnimatingOut && notification.AnimationProgress > 0f)
            {
                notification.AnimationProgress = Math.Max(0f, notification.AnimationProgress - deltaTime * (AnimationSpeed * 0.7f));
            }
            else if (!notification.IsAnimatingOut && !notification.IsDismissed)
            {
                notification.IsAnimatingIn = false;
                
                if (notification.IsExpired && !notification.IsAnimatingOut)
                {
                    notification.IsAnimatingOut = true;
                    notification.IsAnimatingIn = false;
                }
            }
            
            if (notification.IsAnimatingOut && notification.AnimationProgress <= 0.01f)
            {
                _notifications.RemoveAt(i);
            }
        }
    }

    private void DrawNotification(LightlessNotification notification, int index)
    {
        var alpha = notification.AnimationProgress;
        
        if (_configService.Current.EnableNotificationAnimations && alpha <= 0f) 
            return;

        var slideOffset = 0f;
        if (_configService.Current.EnableNotificationAnimations)
        {
            slideOffset = (1f - alpha) * SlideDistance;
        }

        var originalCursorPos = ImGui.GetCursorPos();
        ImGui.SetCursorPosX(originalCursorPos.X + slideOffset);

        var notificationHeight = CalculateNotificationHeight(notification);
        
        using var child = ImRaii.Child($"notification_{notification.Id}", 
            new Vector2(NotificationWidth - slideOffset, notificationHeight), 
            false, ImGuiWindowFlags.NoScrollbar);
            
        if (child.Success)
        {
            DrawNotificationContent(notification, alpha);
        }
    }

    private void DrawNotificationContent(LightlessNotification notification, float alpha)
    {
        var drawList = ImGui.GetWindowDrawList();
        var windowPos = ImGui.GetWindowPos();
        var windowSize = ImGui.GetWindowSize();
        
        var baseOpacity = _configService.Current.NotificationOpacity;
        var finalOpacity = _configService.Current.EnableNotificationAnimations ? baseOpacity * alpha : baseOpacity;
        var bgColor = new Vector4(30f/255f, 30f/255f, 30f/255f, finalOpacity);
        var accentColor = GetNotificationAccentColor(notification.Type);
        var progressBarColor = UIColors.Get("LightlessBlue");
        
        var finalAccentAlpha = _configService.Current.EnableNotificationAnimations ? alpha : 1f;
        accentColor.W *= finalAccentAlpha;
        
        var shadowOffset = new Vector2(1f, 1f);
        var shadowAlpha = _configService.Current.EnableNotificationAnimations ? 0.4f * alpha : 0.4f;
        var shadowColor = new Vector4(0f, 0f, 0f, shadowAlpha);
        drawList.AddRectFilled(
            windowPos + shadowOffset,
            windowPos + windowSize + shadowOffset,
            ImGui.ColorConvertFloat4ToU32(shadowColor),
            3f
        );
        
        var isHovered = ImGui.IsWindowHovered();
        if (isHovered)
        {
            bgColor = bgColor * 1.1f;
            bgColor.W = Math.Min(bgColor.W, 0.98f);
        }
        
        drawList.AddRectFilled(
            windowPos,
            windowPos + windowSize,
            ImGui.ColorConvertFloat4ToU32(bgColor),
            3f
        );

        var accentWidth = 3f;
        drawList.AddRectFilled(
            windowPos,
            windowPos + new Vector2(accentWidth, windowSize.Y),
            ImGui.ColorConvertFloat4ToU32(accentColor),
            3f
        );

        DrawDurationProgressBar(notification, alpha, windowPos, windowSize, progressBarColor, drawList);

        DrawNotificationText(notification, alpha);
    }

    private void DrawDurationProgressBar(LightlessNotification notification, float alpha, Vector2 windowPos, Vector2 windowSize, Vector4 progressBarColor, ImDrawListPtr drawList)
    {
        var elapsed = DateTime.UtcNow - notification.CreatedAt;
        var progress = Math.Min(1.0f, (float)(elapsed.TotalSeconds / notification.Duration.TotalSeconds));
        
        var progressHeight = 2f;
        var progressY = windowPos.Y + windowSize.Y - progressHeight;
        var progressWidth = windowSize.X * progress;
        
        var bgProgressColor = new Vector4(progressBarColor.X * 0.3f, progressBarColor.Y * 0.3f, progressBarColor.Z * 0.3f, 0.5f * alpha);
        drawList.AddRectFilled(
            new Vector2(windowPos.X, progressY),
            new Vector2(windowPos.X + windowSize.X, progressY + progressHeight),
            ImGui.ColorConvertFloat4ToU32(bgProgressColor),
            0f
        );
        
        if (progress > 0)
        {
            var progressColor = progressBarColor;
            progressColor.W *= alpha;
            drawList.AddRectFilled(
                new Vector2(windowPos.X, progressY),
                new Vector2(windowPos.X + progressWidth, progressY + progressHeight),
                ImGui.ColorConvertFloat4ToU32(progressColor),
                0f
            );
        }
    }

    private void DrawNotificationText(LightlessNotification notification, float alpha)
    {
        var padding = new Vector2(10f, 6f);
        var contentPos = new Vector2(6f, 0f) + padding;
        var windowSize = ImGui.GetWindowSize();
        var contentSize = windowSize - padding * 2 - new Vector2(6f, 0f);
        
        ImGui.SetCursorPos(contentPos);
        
        float titleHeight = 0f;
        using (ImRaii.PushColor(ImGuiCol.Text, new Vector4(1f, 1f, 1f, alpha)))
        {
            // Set text wrap position to prevent title overflow
            ImGui.PushTextWrapPos(ImGui.GetCursorPosX() + contentSize.X);
            
            var titleStartY = ImGui.GetCursorPosY();
            
            if (_configService.Current.ShowNotificationTimestamp)
            {
                var timestamp = notification.CreatedAt.ToLocalTime().ToString("HH:mm:ss");
                ImGui.TextWrapped($"[{timestamp}] {notification.Title}");
            }
            else
            {
                ImGui.TextWrapped(notification.Title);
            }
            
            titleHeight = ImGui.GetCursorPosY() - titleStartY;
            ImGui.PopTextWrapPos();
        }
        
        if (!string.IsNullOrEmpty(notification.Message))
        {
            ImGui.SetCursorPos(contentPos + new Vector2(0f, titleHeight + 4f));
            ImGui.PushTextWrapPos(ImGui.GetCursorPosX() + contentSize.X);
            using (ImRaii.PushColor(ImGuiCol.Text, new Vector4(0.9f, 0.9f, 0.9f, alpha)))
            {
                ImGui.TextWrapped(notification.Message);
            }
            ImGui.PopTextWrapPos();
        }
        
        if (notification.ShowProgress)
        {
            ImGui.Spacing();
            var progressColor = GetNotificationAccentColor(notification.Type);
            progressColor.W *= alpha;
            using (ImRaii.PushColor(ImGuiCol.PlotHistogram, progressColor))
            {
                ImGui.ProgressBar(notification.Progress, new Vector2(contentSize.X, 2f), "");
            }
        }
        
        if (notification.Actions.Count > 0)
        {
            ImGui.Spacing();
            ImGui.SetCursorPosX(contentPos.X);
            DrawNotificationActions(notification, contentSize.X, alpha);
        }
    }

    private void DrawNotificationActions(LightlessNotification notification, float availableWidth, float alpha)
    {
        var buttonSpacing = 8f;
        var rightPadding = 10f;
        var usableWidth = availableWidth - rightPadding;
        var totalSpacing = (notification.Actions.Count - 1) * buttonSpacing;
        var buttonWidth = (usableWidth - totalSpacing) / notification.Actions.Count;
        
        _logger.LogDebug("Drawing {ActionCount} notification actions, buttonWidth: {ButtonWidth}, availableWidth: {AvailableWidth}", 
            notification.Actions.Count, buttonWidth, availableWidth);
        
        var startCursorPos = ImGui.GetCursorPos();
        
        for (int i = 0; i < notification.Actions.Count; i++)
        {
            var action = notification.Actions[i];
            
            if (i > 0)
            {
                ImGui.SameLine();
                var currentX = startCursorPos.X + i * (buttonWidth + buttonSpacing);
                ImGui.SetCursorPosX(currentX);
            }
            DrawActionButton(action, notification, alpha, buttonWidth);
        }
    }

    private void DrawActionButton(LightlessNotificationAction action, LightlessNotification notification, float alpha, float buttonWidth)
    {
        _logger.LogDebug("Drawing action button: {ActionId} - {ActionLabel}, width: {ButtonWidth}", action.Id, action.Label, buttonWidth);
        
        var buttonColor = action.Color;
        buttonColor.W *= alpha;
        
        var hoveredColor = buttonColor * 1.1f;
        hoveredColor.W = buttonColor.W;
        
        var activeColor = buttonColor * 0.9f;
        activeColor.W = buttonColor.W;
        
        using (ImRaii.PushColor(ImGuiCol.Button, buttonColor))
        using (ImRaii.PushColor(ImGuiCol.ButtonHovered, hoveredColor))
        using (ImRaii.PushColor(ImGuiCol.ButtonActive, activeColor))
        using (ImRaii.PushColor(ImGuiCol.Text, new Vector4(1f, 1f, 1f, alpha)))
        {
            var buttonPressed = false;
            
            if (action.Icon != FontAwesomeIcon.None)
            {
                buttonPressed = DrawIconTextButton(action.Icon, action.Label, buttonWidth, alpha);
            }
            else
            {
                buttonPressed = ImGui.Button(action.Label, new Vector2(buttonWidth, 0));
            }
            
            _logger.LogDebug("Button {ActionId} pressed: {ButtonPressed}", action.Id, buttonPressed);
            
            if (buttonPressed)
            {
                try
                {
                    _logger.LogDebug("Executing action: {ActionId}", action.Id);
                    action.OnClick(notification);
                    _logger.LogDebug("Action executed successfully: {ActionId}", action.Id);
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Error executing notification action: {ActionId}", action.Id);
                }
            }
        }
    }
    
    private bool DrawIconTextButton(FontAwesomeIcon icon, string text, float width, float alpha)
    {
        var drawList = ImGui.GetWindowDrawList();
        var cursorPos = ImGui.GetCursorScreenPos();
        var frameHeight = ImGui.GetFrameHeight();
        
        Vector2 iconSize;
        using (ImRaii.PushFont(UiBuilder.IconFont))
        {
            iconSize = ImGui.CalcTextSize(icon.ToIconString());
        }
        
        var textSize = ImGui.CalcTextSize(text);
        var spacing = 3f * ImGuiHelpers.GlobalScale;
        var totalTextWidth = iconSize.X + spacing + textSize.X;
        
        var buttonPressed = ImGui.InvisibleButton($"btn_{icon}_{text}", new Vector2(width, frameHeight));
        
        var buttonMin = ImGui.GetItemRectMin();
        var buttonMax = ImGui.GetItemRectMax();
        var buttonSize = buttonMax - buttonMin;
        
        var buttonColor = ImGui.GetColorU32(ImGuiCol.Button);
        if (ImGui.IsItemHovered())
            buttonColor = ImGui.GetColorU32(ImGuiCol.ButtonHovered);
        if (ImGui.IsItemActive())
            buttonColor = ImGui.GetColorU32(ImGuiCol.ButtonActive);
        
        drawList.AddRectFilled(buttonMin, buttonMax, buttonColor, 3f);
        
        var iconPos = buttonMin + new Vector2((buttonSize.X - totalTextWidth) / 2f, (buttonSize.Y - iconSize.Y) / 2f);
        var textPos = iconPos + new Vector2(iconSize.X + spacing, (iconSize.Y - textSize.Y) / 2f);
        
        var textColor = ImGui.GetColorU32(ImGuiCol.Text);
        
        // Draw icon
        using (ImRaii.PushFont(UiBuilder.IconFont))
        {
            drawList.AddText(iconPos, textColor, icon.ToIconString());
        }
        
        // Draw text
        drawList.AddText(textPos, textColor, text);
        
        return buttonPressed;
    }

    private float CalculateNotificationHeight(LightlessNotification notification)
    {
        var contentWidth = NotificationWidth - 35f; // Account for padding and accent bar
        var height = 20f; // Base height for padding
        
        var titleText = notification.Title;
        if (_configService.Current.ShowNotificationTimestamp)
        {
            var timestamp = notification.CreatedAt.ToLocalTime().ToString("HH:mm:ss");
            titleText = $"[{timestamp}] {titleText}";
        }
        
        var titleSize = ImGui.CalcTextSize(titleText, true, contentWidth);
        height += titleSize.Y + 4f; // Title height + spacing
        
        // Calculate message height
        if (!string.IsNullOrEmpty(notification.Message))
        {
            var messageSize = ImGui.CalcTextSize(notification.Message, true, contentWidth);
            height += messageSize.Y + 4f; // Message height + spacing
        }
        
        // Add height for progress bar
        if (notification.ShowProgress)
        {
            height += 12f;
        }
        
        // Add height for action buttons
        if (notification.Actions.Count > 0)
        {
            height += 28f;
        }
        
        // Allow notifications to grow taller but cap at maximum height
        return Math.Clamp(height, NotificationMinHeight, NotificationMaxHeight);
    }

    private Vector4 GetNotificationAccentColor(NotificationType type)
    {
        return type switch
        {
            NotificationType.Info => UIColors.Get("LightlessPurple"),
            NotificationType.Warning => UIColors.Get("LightlessYellow"),
            NotificationType.Error => UIColors.Get("DimRed"),
            NotificationType.PairRequest => UIColors.Get("LightlessBlue"),
            NotificationType.Download => UIColors.Get("LightlessGreen"),
            _ => UIColors.Get("LightlessPurple")
        };
    }
}