using Dalamud.Interface.Windowing;
using ImGuiNET;
using Ktisis.Structs.Env.Weather;
using System;
using System.Numerics;

namespace VoidBox.Windows;

public class ConfigWindow : Window, IDisposable
{
    private string? _renamingName;
    private SavedEnv? _renaming;

    public ConfigWindow() : base(
        "VoidBox",
        ImGuiWindowFlags.NoScrollbar |
        ImGuiWindowFlags.NoScrollWithMouse)
    {
        SizeConstraints = new()
        {
            MinimumSize = new Vector2(430, 184)
        };

        Size = SizeConstraints.Value.MinimumSize;
        SizeCondition = ImGuiCond.FirstUseEver;
    }

    public void Dispose() {
    }

    public override void Draw()
    {
        var config = Service.Config;

        if (ImGui.Checkbox("Enabled", ref config.IsEnabled))
        {
            config.Save();
        }

        ImGui.Columns(2, "", false);

        if (ImGui.BeginListBox("", new Vector2(-1f, ImGui.GetContentRegionAvail().Y - ImGui.CalcTextSize("").Y - ImGui.GetStyle().ItemSpacing.Y * 2f)))
        {
            foreach (var entry in Service.Envs.Copy())
            {
                AddMainEntry(entry);
            }

            ImGui.EndListBox();
        }

        if (ImGui.Button("Add current"))
        {
            config.Envs.Add(new SavedEnv($"Saved #{config.Envs.Count + 1}", Service.Plugin.Current));
            config.Save();
        }

        ImGui.NextColumn();

        if (ImGui.BeginCombo("Login", (config.LoginEnv ?? SavedEnv.Unchanged).Name))
        {
            var env = config.LoginEnv;
            foreach (var entry in Service.Envs)
            {
                if (AddComboEntry(entry, ref env))
                {
                    config.LoginEnv = env;
                    config.Save();
                }
            }
            ImGui.EndCombo();
        }

        if (ImGui.BeginCombo("Housing", (config.HousingEnv ?? SavedEnv.Unchanged).Name))
        {
            var env = config.HousingEnv;
            foreach (var entry in Service.Envs)
            {
                if (AddComboEntry(entry, ref env))
                {
                    config.HousingEnv = env;
                    config.Save();
                }
            }
            ImGui.EndCombo();
        }

        void AddMainEntry(EnvCollectionEntry entry)
        {
            (SavedEnv env, bool isBuiltin) = entry;

            bool isPreview = Service.Plugin.Preview == env;
            bool isDefault = env.Env == null;
            bool isRenaming = _renaming == env;
            bool isStyled = false;

            if (isPreview)
            {
                ImGui.PushStyleColor(ImGuiCol.Text, new Vector4(0.8f, 0.3f, 0.9f, 1f));
                isStyled = true;
            }
            else if (isDefault)
            {
                ImGui.PushStyleColor(ImGuiCol.Text, new Vector4(0.8f, 0.3f, 0.3f, 1f));
                isStyled = true;
            }
            else if (isBuiltin)
            {
                ImGui.PushStyleColor(ImGuiCol.Text, new Vector4(0.6f, 0.7f, 0.8f, 1f));
                isStyled = true;
            }

            if (_renaming == env)
            {
                ImGui.PushItemWidth(ImGui.GetContentRegionAvail().X);
                if (ImGui.InputText("", ref _renamingName, 128, ImGuiInputTextFlags.EnterReturnsTrue))
                {
                    _renaming.Name = _renamingName;
                    _renaming = null;
                    config.Save();
                }
                ImGui.PopItemWidth();
            }
            else
            {
                ImGui.Selectable(env.Name, false, ImGuiSelectableFlags.None);
            }

            if (isStyled)
            {
                ImGui.PopStyleColor();
            }

            bool isHovered = ImGui.IsItemHovered(ImGuiHoveredFlags.AllowWhenDisabled);
            bool isLMB = isHovered && ImGui.IsMouseClicked(ImGuiMouseButton.Left);
            bool isRMB = isHovered && ImGui.IsMouseClicked(ImGuiMouseButton.Right);

            if (isHovered)
            {
                if (isDefault)
                {
                    ImGui.SetTooltip("LMB to disable preview.");
                }
                else if (isBuiltin)
                {
                    ImGui.SetTooltip("LMB to toggle preview. Built-in preset.");
                }
                else
                {
                    ImGui.SetTooltip("LMB to toggle preview, RMB to rename, CTRL-RMB to remove.");
                }
            }

            if (isLMB && !isRenaming)
            {
                Service.Plugin.Preview = isPreview ? null : isDefault ? null : env;
            }

            if (!isBuiltin && isRMB)
            {
                if (ImGui.IsKeyDown(ImGuiKey.ModCtrl))
                {
                    if (isRenaming)
                    {
                        _renaming = null;
                    }
                    else
                    {
                        if (isPreview)
                        {
                            Service.Plugin.Preview = null;
                        }

                        config.Envs.Remove(env);
                        config.Save();
                    }
                }
                else
                {
                    _renamingName = env.Name;
                    _renaming = env;
                }
            }
        }

        bool AddComboEntry(EnvCollectionEntry entry, ref SavedEnv? curr)
        {
            (SavedEnv env, bool isBuiltin) = entry;

            SavedEnv? set = env.Env == null ? null : env;

            if (ImGui.Selectable(env.Name, set == curr, ImGuiSelectableFlags.None))
            {
                curr = set;
                return true;
            }

            return false;
        }
    }
}