using Dalamud.Bindings.ImGui;
using HSUI.Config;
using HSUI.Helpers;
using HSUI.Interface;
using System;
using System.Collections.Generic;
using System.Numerics;

namespace HSUI.Interface.GeneralElements
{
    public class MainMenuHud : DraggableHudElement, IHudElementWithVisibilityConfig
    {
        private const float BarPadding = 0f;
        private const float BackgroundRounding = 6f;
        /// <summary>Extra padding around content when drawing the background so the bar doesn't extend past the icons.</summary>
        private const float BackgroundEdgePad = 2f;

        private MainMenuConfig Config => (MainMenuConfig)_config;
        public VisibilityConfig VisibilityConfig => Config.VisibilityConfig;

        /// <summary>When set, the context menu with these entries should be shown (same frame or next). Cleared when popup closes.</summary>
        private List<(uint CommandId, string Name)>? _contextMenuEntries = null;

        public MainMenuHud(MainMenuConfig config, string displayName)
            : base(config, displayName) { }

        protected override (List<Vector2>, List<Vector2>) ChildrenPositionsAndSizes()
        {
            return (new List<Vector2> { Config.Position }, new List<Vector2> { Config.Size });
        }

        public override (Vector2 min, Vector2 max) GetScreenBounds(Vector2 origin)
        {
            Vector2 topLeft = Utils.GetAnchoredPosition(origin + ParentPos() + Config.Position, Config.Size, Config.Anchor);
            return (topLeft, topLeft + Config.Size);
        }

        public override void DrawChildren(Vector2 origin)
        {
            if (!Config.Enabled)
                return;

            var entries = MainMenuHelper.GetEnabledMainCommands();
            if (entries.Count == 0)
                return;

            Vector2 basePos = Utils.GetAnchoredPosition(origin + Config.Position, Config.Size, Config.Anchor);
            Vector2 iconSize = new Vector2(Config.IconSize, Config.IconSize);
            bool horizontal = Config.LayoutDirection == 0;

            AddDrawAction(Config.StrataLevel, () =>
            {
                DrawHelper.DrawInWindow(ID, basePos, Config.Size, true, (drawListParam) =>
                {
                    var drawList = ImGui.GetWindowDrawList();

                    // Compute total content size and starting position so icons are centered in the bar
                    int count = entries.Count;
                    float contentW, contentH;
                    if (horizontal)
                    {
                        contentW = count * iconSize.X + (count > 0 ? (count - 1) * Config.Spacing : 0);
                        if (Config.ShowLabels)
                        {
                            for (int i = 0; i < count; i++)
                                contentW += ImGui.CalcTextSize(entries[i].Name).X + Config.Spacing;
                        }
                        contentH = iconSize.Y;
                    }
                    else
                    {
                        contentW = iconSize.X;
                        contentH = 0;
                        foreach (var e in entries)
                        {
                            float h = iconSize.Y + Config.Spacing;
                            if (Config.ShowLabels && !string.IsNullOrEmpty(e.Name))
                                h += ImGui.CalcTextSize(e.Name).Y + 2;
                            contentH += h;
                        }
                        if (contentH > 0) contentH -= Config.Spacing;
                    }
                    float startX = basePos.X + BarPadding + Math.Max(0, (Config.Size.X - 2f * BarPadding - contentW) / 2f);
                    float startY = basePos.Y + BarPadding + Math.Max(0, (Config.Size.Y - 2f * BarPadding - contentH) / 2f);

                    // Draw background only over the content area so no gray bar shows on left/right
                    Vector2 bgMin = new Vector2(startX - BackgroundEdgePad, basePos.Y);
                    Vector2 bgMax = new Vector2(startX + contentW + BackgroundEdgePad, basePos.Y + Config.Size.Y);
                    if (!horizontal)
                    {
                        bgMin = new Vector2(basePos.X, startY - BackgroundEdgePad);
                        bgMax = new Vector2(basePos.X + Config.Size.X, startY + contentH + BackgroundEdgePad);
                    }
                    drawList.AddRectFilled(bgMin, bgMax, Config.BackgroundColor.Base, BackgroundRounding);
                    drawList.PushClipRect(basePos, basePos + Config.Size, true);

                    float x = startX;
                    float y = startY;
                    int index = 0;

                    foreach (var entry in entries)
                    {
                        Vector2 iconPos = horizontal
                            ? new Vector2(x, basePos.Y + (Config.Size.Y - iconSize.Y) / 2f)
                            : new Vector2(basePos.X + (Config.Size.X - iconSize.X) / 2f, y);
                        Vector2 iconEnd = iconPos + iconSize;

                        // Use InvisibleButton so ImGui tracks hover/click for this icon
                        ImGui.SetCursorScreenPos(iconPos);
                        ImGui.InvisibleButton($"##mainmenu_icon_{ID}_{index}", iconSize);
                        bool hovered = ImGui.IsItemHovered();

                        uint tint = Config.IconTint.Base;
                        if (hovered)
                        {
                            tint = Config.HoverTint.Base;
                            TooltipsHelper.Instance.NotifyMouseOverHudElement();
                            TooltipsHelper.Instance.ShowTooltipOnCursor(entry.Name);
                        }

                        if (ImGui.IsItemClicked(ImGuiMouseButton.Left) || ImGui.IsItemClicked(ImGuiMouseButton.Right))
                        {
                            var subEntries = MainMenuHelper.GetSubCommandEntries(entry.CommandId);
                            if (subEntries != null && subEntries.Count > 0)
                            {
                                _contextMenuEntries = subEntries;
                                ImGui.OpenPopup("HSUI_MainMenu_Context");
                                ImGui.SetNextWindowPos(ImGui.GetMousePos());
                            }
                            else
                            {
                                MainMenuHelper.ExecuteMainCommand(entry.CommandId);
                            }
                        }

                        if (entry.IconId != 0)
                            DrawHelper.DrawIcon(entry.IconId, iconPos, iconSize, false, tint, drawList);

                        float labelH = 0;
                        if (Config.ShowLabels && !string.IsNullOrEmpty(entry.Name))
                        {
                            float labelW = ImGui.CalcTextSize(entry.Name).X;
                            labelH = ImGui.CalcTextSize(entry.Name).Y;
                            Vector2 labelPos = horizontal
                                ? new Vector2(iconPos.X + iconSize.X + Config.Spacing, basePos.Y + (Config.Size.Y - labelH) / 2f)
                                : new Vector2(basePos.X + (Config.Size.X - labelW) / 2f, iconPos.Y + iconSize.Y + 2);
                            drawList.AddText(labelPos, Config.IconTint.Base, entry.Name);
                        }

                        if (horizontal)
                        {
                            float advance = iconSize.X + Config.Spacing;
                            if (Config.ShowLabels) advance += ImGui.CalcTextSize(entry.Name).X + Config.Spacing;
                            x += advance;
                        }
                        else
                        {
                            y += iconSize.Y + 2 + labelH + Config.Spacing;
                        }
                        index++;
                    }

                    drawList.PopClipRect();

                    // Draw context menu popup (same options as default main menu bar)
                    if (ImGui.BeginPopup("HSUI_MainMenu_Context", ImGuiWindowFlags.NoMove))
                    {
                        if (_contextMenuEntries != null)
                        {
                            foreach (var (cmdId, name) in _contextMenuEntries)
                            {
                                if (ImGui.Selectable(name))
                                {
                                    uint commandId = cmdId;
                                    Plugin.Framework.RunOnFrameworkThread(() => MainMenuHelper.ExecuteMainCommand(commandId));
                                    ImGui.CloseCurrentPopup();
                                }
                            }
                        }
                        ImGui.EndPopup();
                    }
                    else
                    {
                        _contextMenuEntries = null;
                    }
                }, true);
            });
        }
    }
}