using System;
using System.Numerics;
using Dalamud.Bindings.ImGui;
using Dalamud.Interface.Utility.Raii;
using KamiLib.Window;
using Mappy.Controllers;
using Mappy.Data;
using FFXIVClientStructs.FFXIV.Client.UI.Agent;

namespace Mappy.Windows;

public class MinimapWindow : Window
{
    public MinimapWindow() : base("HSMappy Minimap###HSMappyMinimap", new Vector2(200.0f, 200.0f))
    {
        DisableWindowSounds = true;
        Flags |= ImGuiWindowFlags.NoDecoration | ImGuiWindowFlags.NoResize | ImGuiWindowFlags.NoScrollWithMouse;
    }

    public override bool DrawConditions() =>
        IntegrationsController.ShouldShowMinimap() && System.SystemConfig.ShowMinimap;

    public override void PreOpenCheck()
    {
        if (Service.ClientState is { IsLoggedIn: false } or { IsPvP: true })
            IsOpen = false;
    }

    protected override unsafe void DrawContents()
    {
        var agent = AgentMap.Instance();
        // Try loading from Lumina first so minimap can show without ever opening the area map
        if (!System.MapRenderer.HasMinimapCacheFor(agent->CurrentMapId) && agent->SelectedMapId != agent->CurrentMapId)
            System.MapRenderer.TryEnsureLuminaCacheFor(agent->CurrentMapId);

        var mapLoaded = agent->SelectedMapId == agent->CurrentMapId || System.MapRenderer.HasMinimapCacheFor(agent->CurrentMapId);

        if (!mapLoaded)
        {
            // Map data could not be loaded for this area (no Lumina path matched). Minimap shows automatically when data is available.
            const string hint = "Map unavailable for this area.";
            var textSize = ImGui.CalcTextSize(hint);
            var pos = (ImGui.GetWindowSize() - textSize) * 0.5f;
            ImGui.SetCursorPos(new Vector2(Math.Max(0, pos.X), Math.Max(20, pos.Y)));
            ImGui.TextColored(new Vector4(0.7f, 0.7f, 0.7f, 0.9f), hint);
            UpdateStyle();
            UpdateSizePosition();
            return;
        }

        UpdateStyle();
        UpdateSizePosition();

        // Compensate for window padding: draw the minimap child so it fills the full window (no black bands).
        var padding = ImGui.GetStyle().WindowPadding;
        var winSize = ImGui.GetWindowSize();
        ImGui.SetCursorPos(new Vector2(-padding.X, -padding.Y));
        var contentSize = winSize;

        if (contentSize.X <= 0 || contentSize.Y <= 0) return;

        using (ImRaii.PushStyle(ImGuiStyleVar.Alpha, System.SystemConfig.MinimapOpacity))
        using (ImRaii.PushStyle(ImGuiStyleVar.ChildBorderSize, 0f))
        using (ImRaii.PushStyle(ImGuiStyleVar.WindowPadding, Vector2.Zero))
        using (var child = ImRaii.Child("minimap_render", contentSize, false, ImGuiWindowFlags.NoScrollbar | ImGuiWindowFlags.NoScrollWithMouse))
        {
            if (child) {
                // Use window size so map fills the full window; renderer clamps draw position so map always covers the view.
                System.MapRenderer.DrawMinimapContents(contentSize);
                // Mouse wheel over minimap: zoom in/out, and consume wheel so the window doesn't scroll
                if (ImGui.IsItemHovered()) {
                    var io = ImGui.GetIO();
                    var wheel = io.MouseWheel;
                    if (wheel != 0) {
                        var zoom = System.SystemConfig.MinimapZoom;
                        zoom -= wheel * 0.012f; // Small step so zoom is incremental between max out (0.1) and max in (0.03)
                        System.SystemConfig.MinimapZoom = Math.Clamp(zoom, 0.03f, 0.112f);
                        SystemConfig.Save();
                    }
                    // Consume wheel so the window doesn't scroll when at min/max zoom or when we handled it
                    io.MouseWheel = 0f;
                    io.MouseWheelH = 0f;
                }
            }
        }

        // Restore default padding for the next window is done in plugin Draw callback (PopStyleVar after all windows).
    }

    public override void OnOpen()
    {
        ImGui.SetWindowPos(System.SystemConfig.MinimapPosition);
        ImGui.SetWindowSize(new Vector2(System.SystemConfig.MinimapSize, System.SystemConfig.MinimapSize));
    }

    private void UpdateStyle()
    {
        if (System.SystemConfig.MinimapLockPosition)
            Flags |= ImGuiWindowFlags.NoMove;
        else
            Flags &= ~ImGuiWindowFlags.NoMove;
    }

    private void UpdateSizePosition()
    {
        var config = System.SystemConfig;
        var windowPosition = ImGui.GetWindowPos();
        var windowSize = ImGui.GetWindowSize();
        var configSize = config.MinimapSize;

        // Size is config-only (set in Mappy settings); always apply config size to window.
        if (Math.Abs(windowSize.X - configSize) > 0.1f || Math.Abs(windowSize.Y - configSize) > 0.1f)
            ImGui.SetWindowSize(new Vector2(configSize, configSize));

        if (!ImGui.IsWindowFocused(ImGuiFocusedFlags.RootAndChildWindows)) {
            // Not focused: apply config position to window
            if (windowPosition != config.MinimapPosition)
                ImGui.SetWindowPos(config.MinimapPosition);
        } else {
            // Focused: save window position to config (size is changed only via settings)
            if (config.MinimapPosition != windowPosition) {
                config.MinimapPosition = windowPosition;
                SystemConfig.Save();
            }
        }
    }
}