using System;
using System.Numerics;
using Content.Client.Station; // Frontier
using Content.Client.Weapons.Ranged.Systems;
using Content.Shared.Projectiles;
using Content.Shared.Shuttles.BUIStates;
using Content.Shared.Shuttles.Components;
using Content.Shared.Shuttles.Systems;
using Content.Shared.Weapons.Ranged.Components;
using JetBrains.Annotations;
using Robust.Client.AutoGenerated;
using Robust.Client.Graphics;
using Robust.Client.UserInterface;
using Robust.Client.UserInterface.XAML;
using Robust.Shared.Input;
using Robust.Shared.Map;
using Robust.Shared.Map.Components;
using Robust.Shared.Physics;
using Robust.Shared.Physics.Components;

namespace Content.Client.Shuttles.UI;

[GenerateTypedNameReferences]
public sealed partial class ShuttleNavControl : BaseShuttleControl
{
    [Dependency] private readonly IMapManager _mapManager = default!;
    private readonly SharedShuttleSystem _shuttles;
    private readonly SharedTransformSystem _transform;
    private readonly EntityLookupSystem _lookup; // WD EDIT
    private readonly GunSystem _gun; // WD EDIT

    /// <summary>
    /// Used to transform all of the radar objects. Typically is a shuttle console parented to a grid.
    /// </summary>
    private EntityCoordinates? _coordinates;

    private Angle? _rotation;

    private Dictionary<NetEntity, List<DockingPortState>> _docks = new();

    public bool ShowIFF { get; set; } = true;
    public bool ShowDocks { get; set; } = true;
    public float FieldOfView = MathF.Tau;

    /// <summary>
    /// Raised if the user left-clicks on the radar control with the relevant entitycoordinates.
    /// </summary>
    public Action<EntityCoordinates>? OnRadarClick;

    private List<Entity<MapGridComponent>> _grids = new();

    public ShuttleNavControl() : base(64f, 256f, 256f)
    {
        RobustXamlLoader.Load(this);
        _shuttles = EntManager.System<SharedShuttleSystem>();
        _transform = EntManager.System<SharedTransformSystem>();
        _lookup = EntManager.System<EntityLookupSystem>(); // WWDP EDIT
        _gun = EntManager.System<GunSystem>(); // WWDP EDIT
    }

    public void SetMatrix(EntityCoordinates? coordinates, Angle? angle)
    {
        _coordinates = coordinates;
        _rotation = angle;
    }

    protected override void KeyBindUp(GUIBoundKeyEventArgs args)
    {
        base.KeyBindUp(args);

        if (_coordinates == null || _rotation == null || args.Function != EngineKeyFunctions.UIClick ||
            OnRadarClick == null)
        {
            return;
        }

        var a = InverseScalePosition(args.RelativePosition);
        var relativeWorldPos = new Vector2(a.X, -a.Y);
        relativeWorldPos = _rotation.Value.RotateVec(relativeWorldPos);
        var coords = _coordinates.Value.Offset(relativeWorldPos);
        OnRadarClick?.Invoke(coords);
    }

    /// <summary>
    /// Gets the entitycoordinates of where the mouseposition is, relative to the control.
    /// </summary>
    [PublicAPI]
    public EntityCoordinates GetMouseCoordinates(ScreenCoordinates screen)
    {
        if (_coordinates == null || _rotation == null)
        {
            return EntityCoordinates.Invalid;
        }

        var pos = screen.Position / UIScale - GlobalPosition;

        var a = InverseScalePosition(pos);
        var relativeWorldPos = new Vector2(a.X, -a.Y);
        relativeWorldPos = _rotation.Value.RotateVec(relativeWorldPos);
        var coords = _coordinates.Value.Offset(relativeWorldPos);
        return coords;
    }

    public void UpdateState(NavInterfaceState state)
    {
        SetMatrix(EntManager.GetCoordinates(state.Coordinates), state.Angle);

        WorldMaxRange = state.MaxRange;

        if (WorldMaxRange < WorldRange)
        {
            ActualRadarRange = WorldMaxRange;
        }

        if (WorldMaxRange < WorldMinRange)
            WorldMinRange = WorldMaxRange;

        ActualRadarRange = Math.Clamp(ActualRadarRange, WorldMinRange, WorldMaxRange);

        _docks = state.Docks;

        FieldOfView = state.FieldOfView; // WWDP EDIT

        NfUpdateState(state); // Frontier Update State
    }

    protected override void Draw(DrawingHandleScreen handle)
    {
        base.Draw(handle);

        DrawBacking(handle);

        // No data
        if (_coordinates == null || _rotation == null)
        {
            return;
        }

        var xformQuery = EntManager.GetEntityQuery<TransformComponent>();
        var fixturesQuery = EntManager.GetEntityQuery<FixturesComponent>();
        var bodyQuery = EntManager.GetEntityQuery<PhysicsComponent>();

        _gun.TryGetGun(_coordinates.Value.EntityId, out _, out var ourGunComp); // WWDP EDIT

        if (!xformQuery.TryGetComponent(_coordinates.Value.EntityId, out var xform)
            || xform.MapID == MapId.Nullspace)
        {
            return;
        }

        var mapPos = _transform.ToMapCoordinates(_coordinates.Value);
        var offset = _coordinates.Value.Position;
        var posMatrix = Matrix3Helpers.CreateTransform(offset, _rotation.Value);
        var (_, ourEntRot, ourEntMatrix) = _transform.GetWorldPositionRotationMatrix(_coordinates.Value.EntityId);
        var ourWorldMatrix = Matrix3x2.Multiply(posMatrix, ourEntMatrix);
        var ourWorldPos = ourWorldMatrix.Translation; // WD EDIT
        Matrix3x2.Invert(ourWorldMatrix, out var ourWorldMatrixInvert);

        // Draw our grid in detail
        var ourGridId = xform.GridUid;
        if (EntManager.TryGetComponent<MapGridComponent>(ourGridId, out var ourGrid) &&
            fixturesQuery.HasComponent(ourGridId.Value))
        {
            var ourGridMatrix = _transform.GetWorldMatrix(ourGridId.Value);
            var matrix = Matrix3x2.Multiply(ourGridMatrix, ourWorldMatrixInvert);
            var color = _shuttles.GetIFFColor(ourGridId.Value, self: true);

            DrawGrid(handle, matrix, (ourGridId.Value, ourGrid), color);
            DrawDocks(handle, ourGridId.Value, matrix);
        }

        var invertedPosition = _coordinates.Value.Position - offset;
        invertedPosition.Y = -invertedPosition.Y;
        // Don't need to transform the InvWorldMatrix again as it's already offset to its position.

        // Draw radar position on the station
        var radarPos = invertedPosition;
        const float radarVertRadius = 2f;

        var radarPosVerts = new Vector2[]
        {
            ScalePosition(radarPos + new Vector2(0f, -radarVertRadius)),
            ScalePosition(radarPos + new Vector2(radarVertRadius / 2f, 0f)),
            ScalePosition(radarPos + new Vector2(0f, radarVertRadius)),
            ScalePosition(radarPos + new Vector2(radarVertRadius / -2f, 0f)),
        };

        handle.DrawPrimitives(DrawPrimitiveTopology.TriangleFan, radarPosVerts, Color.Lime);
        //handle.DrawLine(ScalePosition(radarPos), ScalePosition(radarPos - Vector2.UnitY * 20), Color.Lime);

        var rot = ourEntRot + _rotation.Value;
        var viewBounds = new Box2Rotated(new Box2(-WorldRange, -WorldRange, WorldRange, WorldRange).Translated(mapPos.Position), rot, mapPos.Position);
        var viewAABB = viewBounds.CalcBoundingBox();

        _grids.Clear();
        _mapManager.FindGridsIntersecting(xform.MapID, new Box2(mapPos.Position - MaxRadarRangeVector, mapPos.Position + MaxRadarRangeVector), ref _grids, approx: true, includeMap: false);
        List<(Vector2, string, Color)> IFFLabels = new(); // WD EDIT
        // Draw other grids... differently
        foreach (var grid in _grids)
        {
            var gUid = grid.Owner;
            if (gUid == ourGridId || !fixturesQuery.HasComponent(gUid))
                continue;

            var gridBody = bodyQuery.GetComponent(gUid);
            EntManager.TryGetComponent<IFFComponent>(gUid, out var iff);

            if (!_shuttles.CanDraw(gUid, gridBody, iff))
                continue;

            var gridMatrix = _transform.GetWorldMatrix(gUid);
            var matty = Matrix3x2.Multiply(gridMatrix, ourWorldMatrixInvert);
            var color = _shuttles.GetIFFColor(grid, self: false, iff);

            // Others default:
            // Color.FromHex("#FFC000FF")
            // Hostile default: Color.Firebrick
            var labelName = _shuttles.GetIFFLabel(grid, self: false, iff);

            // WD EDIT START
            var gridCentre = Vector2.Transform(gridBody.LocalCenter, matty);
            var gridInCone = Vector2.Normalize(gridCentre).Y >= MathF.Cos(FieldOfView / 2) || FieldOfView >= MathF.Tau;
            // WD EDITN END

            if (ShowIFF &&
                 labelName != null)
            {
                var gridBounds = grid.Comp.LocalAABB;

                if (gridInCone) // WD EDIT
                {
                    gridCentre.Y = -gridCentre.Y;
                    var distance = gridCentre.Length();
                    var labelText = Loc.GetString("shuttle-console-iff-label", ("name", labelName),
                        ("distance", $"{distance:0.0}"));

                    // yes 1.0 scale is intended here.
                    var labelDimensions = handle.GetDimensions(Font, labelText, 1f);

                    // y-offset the control to always render below the grid (vertically)
                    var yOffset = Math.Max(gridBounds.Height, gridBounds.Width) * MinimapScale / 1.8f;

                    // The actual position in the UI. We offset the matrix position to render it off by half its width
                    // plus by the offset.
                    var uiPosition = ScalePosition(gridCentre) - new Vector2(labelDimensions.X / 2f, -yOffset);

                    // Look this is uggo so feel free to cleanup. We just need to clamp the UI position to within the viewport.
                    uiPosition = new Vector2(Math.Clamp(uiPosition.X, 0f, PixelWidth - labelDimensions.X),
                        Math.Clamp(uiPosition.Y, 0f, PixelHeight - labelDimensions.Y));

                    IFFLabels.Add((uiPosition, labelText, color)); // WD EDIT
                    //handle.DrawString(Font, uiPosition, labelText, color);
                }
            }

            // Detailed view
            var gridAABB = gridMatrix.TransformBox(grid.Comp.LocalAABB);

            // Skip drawing if it's out of range.
            if (!gridAABB.Intersects(viewAABB))
                continue;

            DrawGrid(handle, matty, grid, color);
            DrawDocks(handle, gUid, matty);

            // WWDP EDIT START
            // Leading pip
            if (ourGunComp is not { } gun || !gridInCone)
                continue;

            // This entire fucking draw method was written by a schizophrenic, i hate it here
            var gridCenterWorld = Vector2.Transform(gridBody.LocalCenter, gridMatrix);
            // https://math.stackexchange.com/a/1346509
            var u1 = gridBody.LinearVelocity.Length();
            var u2 = gun.ProjectileSpeedModified;

            var dirToGrid = (float)Angle.FromWorldVec(gridCenterWorld - ourWorldPos).Theta;
            var sinBeta = u1 / u2 * (float) Math.Sin(-Angle.FromWorldVec(-gridBody.LinearVelocity) + dirToGrid);
            if (!(sinBeta > -1) || !(sinBeta < 1))
                continue;

            var beta = MathF.Asin(sinBeta) + dirToGrid;
            var shootDir = new Vector2(MathF.Sin(beta), MathF.Cos(beta));

            var t = (gridCenterWorld - ourWorldPos).Length() / (-gridBody.LinearVelocity + shootDir * gun.ProjectileSpeedModified).Length();
            if (!(gridBody.LinearVelocity.Length() * t <= 250)) // arbitrary
                continue;

            var leadPosWorld = gridCenterWorld + gridBody.LinearVelocity * t;

            var leadPos = Vector2.Transform(leadPosWorld, ourWorldMatrixInvert);
            var scaledLeadPos = ScalePositionFlipY(leadPos);
            handle.DrawDottedLine(ScalePosition(gridCentre), scaledLeadPos, color, 0, 2, 8);
            handle.DrawCircle(scaledLeadPos, 4, color, false);
            // WWDP EDIT END
        }
        // WWDP EDIT START

        var multiply = Matrix3x2.Multiply(ourWorldMatrixInvert, Matrix3x2.CreateScale(new Vector2(1,-1)));
        var projectiles = _lookup.GetEntitiesInRange<ProjectileComponent>(_coordinates.Value, 256f);
        var verts = new Vector2[projectiles.Count*4];

        var i = 0;
        foreach (var proj in projectiles)
        {
            if (EntManager.TryGetComponent<MapGridComponent>(_transform.GetParentUid(proj), out _))
                continue;

            var pos = ScalePosition(Vector2.Transform(_transform.GetWorldPosition(proj), multiply));
            verts[i * 4] = pos + new Vector2(2, 2);
            verts[i * 4+1] = pos + new Vector2(-2, -2);
            verts[i * 4+2] = pos + new Vector2(2, -2);
            verts[i * 4+3] = pos + new Vector2(-2, 2);
            i++;
        }
        handle.DrawPrimitives(DrawPrimitiveTopology.LineList, verts, Color.Silver);

        if (FieldOfView < MathF.Tau)
        {
            const int segments = 5;
            var hidesey = new Vector2[segments + 2];
            hidesey[0] = MidPointVector;
            for (i = 0; i < segments + 1; i++)
            {
                var angle = i / (float) segments * (MathHelper.TwoPi - FieldOfView) + FieldOfView / 2;
                var pos = new Vector2(MathF.Sin(angle), -MathF.Cos(angle));

                hidesey[i + 1] = MidPointVector + pos * 1024;
            }
            handle.DrawPrimitives(DrawPrimitiveTopology.TriangleFan, hidesey, new Color(0.08f, 0.02f, 0.08f));
        }

        foreach(var (uiPos, label, color) in IFFLabels)
        {
            handle.DrawString(Font, uiPos, label, color);
        }
        DrawCircles(handle);
        // WWDP EDIT END
    }

    private void DrawDocks(DrawingHandleScreen handle, EntityUid uid, Matrix3x2 matrix)
    {
        if (!ShowDocks)
            return;

        const float DockScale = 0.6f;
        var nent = EntManager.GetNetEntity(uid);

        if (_docks.TryGetValue(nent, out var docks))
        {
            foreach (var state in docks)
            {
                var position = state.Coordinates.Position;
                var uiPosition = Vector2.Transform(position, matrix);

                if (uiPosition.Length() > (WorldRange * 2f) - DockScale)
                    continue;

                var color = Color.ToSrgb(Color.Magenta);

                var verts = new[]
                {
                    Vector2.Transform(position + new Vector2(-DockScale, -DockScale), matrix),
                    Vector2.Transform(position + new Vector2(DockScale, -DockScale), matrix),
                    Vector2.Transform(position + new Vector2(DockScale, DockScale), matrix),
                    Vector2.Transform(position + new Vector2(-DockScale, DockScale), matrix),
                };

                for (var i = 0; i < verts.Length; i++)
                {
                    var vert = verts[i];
                    vert.Y = -vert.Y;
                    verts[i] = ScalePosition(vert);
                }

                handle.DrawPrimitives(DrawPrimitiveTopology.TriangleFan, verts, color.WithAlpha(0.8f));
                handle.DrawPrimitives(DrawPrimitiveTopology.LineStrip, verts, color);
            }
        }
    }

    private Vector2 InverseScalePosition(Vector2 value)
    {
        return (value - MidPointVector) / MinimapScale;
    }
}