// New Frontiers - This file is licensed under AGPLv3
// Copyright (c) 2024 New Frontiers Contributors
// See AGPLv3.txt for details.

using System.Numerics;
using Content.Shared._NF.Shuttles.Events;
using Content.Shared.Shuttles.BUIStates;
using Content.Shared.Shuttles.Components;
using Robust.Client.Graphics;
using Robust.Shared.Collections;
using Robust.Client.UserInterface;
using Robust.Shared.Input;
using Robust.Shared.Timing;
using Content.Shared._Mono.Radar;
using Content.Client._Mono.Radar;
using Content.Client.Station;
using Robust.Shared.Physics.Components;
using Robust.Shared.Prototypes;

namespace Content.Client.Shuttles.UI
{
    public sealed partial class ShuttleNavControl
    {
        public bool HideTarget { get; set; } = false;
        public Vector2? Target { get; set; } = null;
        public NetEntity? TargetEntity { get; set; } = null;
        public InertiaDampeningMode DampeningMode { get; set; }
        public ServiceFlags ServiceFlags { get; set; } = ServiceFlags.None;
        private static readonly Color TargetColor = Color.FromHex("#9cae93ff");

        /// <summary>
        /// Whether the shuttle is currently in FTL. This is used to disable the Park button
        /// while in FTL to prevent parking while traveling.
        /// </summary>
        public bool InFtl { get; set; }

        private void NfUpdateState(NavInterfaceState state)
        {
            if (state.MaxIffRange != null)
                MaximumIFFDistance = state.MaxIffRange.Value;
            HideCoords = state.HideCoords;
            Target = state.Target;
            TargetEntity = state.TargetEntity;
            HideTarget = state.HideTarget;

            if (!EntManager.GetCoordinates(state.Coordinates).HasValue ||
                !EntManager.TryGetComponent(EntManager.GetCoordinates(state.Coordinates).GetValueOrDefault().EntityId, out TransformComponent? transform) ||
                !EntManager.HasComponent<PhysicsComponent>(transform.GridUid))
            {
                return;
            }

            DampeningMode = state.DampeningMode;
            Target = state.Target;
            TargetEntity = state.TargetEntity;

            // Check if the entity has an FTLComponent which indicates it's in FTL
            if (transform.GridUid != null)
            {
                InFtl = EntManager.HasComponent<FTLComponent>(transform.GridUid);
            }
            else
            {
                InFtl = false;
            }
        }

        // New Frontiers - Maximum IFF Distance - checks distance to object, draws if closer than max range
        // This code is licensed under AGPLv3. See AGPLv3.txt
        private bool NfCheckShouldDrawIffRangeCondition(bool shouldDrawIff, Vector2 distance)
        {
            if (shouldDrawIff && MaximumIFFDistance >= 0.0f)
            {
                if (distance.Length() > MaximumIFFDistance)
                {
                    shouldDrawIff = false;
                }
            }

            return shouldDrawIff;
        }

        private static void NfAddBlipToList(List<BlipData> blipDataList, bool isOutsideRadarCircle, Vector2 uiPosition, int uiXCentre, int uiYCentre, Color color)
        {
            blipDataList.Add(new BlipData
            {
                IsOutsideRadarCircle = isOutsideRadarCircle,
                UiPosition = uiPosition,
                VectorToPosition = uiPosition - new Vector2(uiXCentre, uiYCentre),
                Color = color
            });
        }

        private static void NfAddBlipToList(List<BlipData> blipDataList, bool isOutsideRadarCircle, Vector2 uiPosition, int uiXCentre, int uiYCentre, Color color, EntityUid gridUid = default)
        {
            Color blipColor = color;

            blipDataList.Add(new BlipData
            {
                IsOutsideRadarCircle = isOutsideRadarCircle,
                UiPosition = uiPosition,
                VectorToPosition = uiPosition - new Vector2(uiXCentre, uiYCentre),
                Color = blipColor
            });
        }

        /**
         * Frontier - Adds blip style triangles that are on ships or pointing towards ships on the edges of the radar.
         * Draws blips at the BlipData's uiPosition and uses VectorToPosition to rotate to point towards ships.
         */
        private void NfDrawBlips(DrawingHandleBase handle, List<BlipData> blipDataList)
        {
            var blipValueList = new Dictionary<Color, ValueList<Vector2>>();

            foreach (var blipData in blipDataList)
            {
                var triangleShapeVectorPoints = new[]
                {
                new Vector2(0, 0),
                new Vector2(RadarBlipSize, 0),
                new Vector2(RadarBlipSize * 0.5f, RadarBlipSize)
            };

                if (blipData.IsOutsideRadarCircle)
                {
                    // Calculate the angle of rotation
                    var angle = (float)Math.Atan2(blipData.VectorToPosition.Y, blipData.VectorToPosition.X) + -1.6f;

                    // Manually create a rotation matrix
                    var cos = (float)Math.Cos(angle);
                    var sin = (float)Math.Sin(angle);
                    float[,] rotationMatrix = { { cos, -sin }, { sin, cos } };

                    // Rotate each vertex
                    for (var i = 0; i < triangleShapeVectorPoints.Length; i++)
                    {
                        var vertex = triangleShapeVectorPoints[i];
                        var x = vertex.X * rotationMatrix[0, 0] + vertex.Y * rotationMatrix[0, 1];
                        var y = vertex.X * rotationMatrix[1, 0] + vertex.Y * rotationMatrix[1, 1];
                        triangleShapeVectorPoints[i] = new Vector2(x, y);
                    }
                }

                var triangleCenterVector =
                    (triangleShapeVectorPoints[0] + triangleShapeVectorPoints[1] + triangleShapeVectorPoints[2]) / 3;

                // Calculate the vectors from the center to each vertex
                var vectorsFromCenter = new Vector2[3];
                for (int i = 0; i < 3; i++)
                {
                    vectorsFromCenter[i] = (triangleShapeVectorPoints[i] - triangleCenterVector) * UIScale;
                }

                // Calculate the vertices of the new triangle
                var newVerts = new Vector2[3];
                for (var i = 0; i < 3; i++)
                {
                    newVerts[i] = (blipData.UiPosition * UIScale) + vectorsFromCenter[i];
                }

                if (!blipValueList.TryGetValue(blipData.Color, out var valueList))
                {
                    valueList = new ValueList<Vector2>();

                }
                valueList.Add(newVerts[0]);
                valueList.Add(newVerts[1]);
                valueList.Add(newVerts[2]);
                blipValueList[blipData.Color] = valueList;
            }

            // One draw call for every color we have
            foreach (var color in blipValueList)
            {
                handle.DrawPrimitives(DrawPrimitiveTopology.TriangleList, color.Value.Span, color.Key);
            }
        }
    }
}