using System.Collections.Generic;
using System.Linq;
using Assets.Common;
using UnityEngine;
using Random = UnityEngine.Random;

namespace Assets
{
//    [RequireComponent(typeof(MeshFilter))]
//    [RequireComponent(typeof(MeshRenderer))]
//    [RequireComponent(typeof(LandmassGenerator))]
    public class MapRenderer : MonoBehaviour
    {
//        public float UVScale = 1.0f;
//
//        private List<Vector3> _vertices;
//        private List<Vector2> _uv;
//        private List<Vector3> _normals;
//        private List<Color> _colors;
//        private List<int> _triangles;
//
//        private List<List<Point>> _edges;
//        
//        public void Generate()
//        {
//            var graph = GetComponent<LandmassGenerator>();
//            
//            graph.Reset();
//            graph.Generate();
//
//            var points = graph.VoronoiGenerator.Voronoi.Vertices;
//
//            _vertices = new List<Vector3>();
//            _normals = new List<Vector3>();
//            _uv = new List<Vector2>();
//            _colors = new List<Color>();
//            _triangles = new List<int>();
//
//            foreach (var location in graph.LocationGenerator.Result.Vertices.Skip(1))
//            {
//                GenerateLocationEdges(location, points);
//                GenerateLocationMeshAlt(location, points);
//                GenerateLocationWall(location, points);
//            }
//            
//            Mesh mesh = new Mesh();
//            mesh.vertices = _vertices.ToArray();
//            mesh.uv = _uv.ToArray();
//            mesh.normals = _normals.ToArray();
//            mesh.triangles = _triangles.ToArray();
//            mesh.colors = _colors.ToArray();
//
//            GetComponent<MeshFilter>().sharedMesh = mesh;
//
//        }
//
//        private void GenerateLocationEdges(Location location, List<Point> points) 
//        {
//            foreach (var (a, b) in location.BoundaryEdges.Select(x => (points[x.Item1], points[x.Item2])))
//                location.DetailedEdge.AddRange(this.SplitEdge(a, b, 3));
//        }
//
//        private IEnumerable<Point> SplitEdge(Point a, Point b, int count)
//        {
////            var direction = ;
//            var magnitude = Point.Dist(a, b);
//            var d = new Point(-(b.y - a.y) / magnitude, (b.x - a.x) / magnitude);
//
//            magnitude *= Random.value * 0.4 - 0.2;
//            
//            Point c = new Point((a.x + b.x) / 2.0 + d.x * magnitude, (a.y + b.y) / 2.0 + d.y * magnitude);
//
//            if (count > 0)
//            {
//                foreach (var p in SplitEdge(a, c, count - 1)) 
//                    yield return p;
//                
//                yield return c;
//                
//                foreach (var p in SplitEdge(c, b, count - 1)) 
//                    yield return p;
//            }
//            else
//            {
//                yield return c;
//            }
//        }
//
//        private void GenerateLocationMeshAlt(Location location, IList<Point> points)
//        {
//            var start = _vertices.Count;
//            var count = location.DetailedEdge.Count;
//            
//            _vertices.AddRange(location.DetailedEdge.Select(p => new Vector3((float)p.x, location.Type.height, (float)p.y)));
//            _normals.AddRange(Enumerable.Repeat(Vector3.up, count));
//            _colors.AddRange(Enumerable.Repeat(Color.blue, count));
//            _uv.AddRange(location.DetailedEdge.Select(p => new Vector2((float)p.x, (float)p.y) / UVScale));
//            
//            var triangulator = new Triangulator(location.DetailedEdge.Select(v => new Vector2((float)v.x, (float)v.y)).ToArray());
//            _triangles.AddRange(triangulator.Triangulate().Select(x => x + start));
//        }
//
//        private void GenerateLocationMesh(Location location, IList<Point> points)
//        {
//            foreach (var vertices in location.Sites.Select(site => site.Edges.Select(x => x.Item1).Reverse()))
//            {
//                int start = _vertices.Count;
//                
//                foreach (var i in vertices)
//                {
//                    var isEdge = location.BoundaryPoints.Contains(i);
//                    
//                    var vertex = points[i];
//                    var v = PointToVector(location, vertex);
//                    
//                    _vertices.Add(v);
//                    _normals.Add(Vector3.up);
//                    _uv.Add(new Vector2(v.x, v.z) / UVScale);
//                    _colors.Add(isEdge ? Color.red : Color.blue);
//                }
//
//                int end = _vertices.Count;
//                
//                var triangulator = new Triangulator(_vertices.Skip(start).Take(end - start).Select(v => new Vector2(v.x, v.z)).ToArray());
//                _triangles.AddRange(triangulator.Triangulate().Select(x => x + start));
//
//            }
//        }
//
//        private static Vector3 PointToVector(Location location, Point vertex)
//        {
//            return new Vector3((float)vertex.x, location.Type.height + Mathf.PerlinNoise((float)vertex.x, (float)vertex.y) / 4, (float)vertex.y);
//        }
//
//        private void GenerateLocationWall(Location location, IList<Point> points)
//        {
//            var length = 0.0;
//
//            var collection = location.DetailedEdge.Append(location.DetailedEdge.First());
//            var edges = collection.Zip(collection.Skip(1), (a, b) => (a, b)).Zip(collection.Skip(2), (tuple, c) => (tuple.a, tuple.b, c));
//
//            foreach (var (p, c, n) in edges)
//            {
//                int start = _vertices.Count;
//                var dist = Point.Dist(p, c);
//
//                var veca = PointToVector(location, p);
//                var vecb = PointToVector(location, c);
//                
//                _vertices.Add(veca);
//                _vertices.Add(new Vector3((float)p.x, -10,(float)p.y));
//                _vertices.Add(vecb);
//                _vertices.Add(new Vector3((float)c.x, -10,(float)c.y));
//
//                var normal = new Vector3((float)(p.x + n.x - c.x) / 2.0f, 0, (float)(p.y + n.y - c.y) / 2.0f).normalized;
//                
//                _normals.AddRange(Enumerable.Repeat(normal, 4));
//                _colors.AddRange(Enumerable.Repeat(Color.red, 4));
//                
//                _triangles.AddRange(new []
//                {
//                    start, start + 2, start + 1,
//                    start + 1, start + 2, start + 3
//                });
//                
//                _uv.AddRange(new []
//                {
//                    new Vector2((float)length, veca.y) / UVScale, 
//                    new Vector2((float)length, -10) / UVScale, 
//                    new Vector2((float)(length + dist), vecb.y) / UVScale, 
//                    new Vector2((float)(length + dist), -10) / UVScale, 
//                });
//                
//                length += dist;
//            }
//        }
//
//        private void OnDrawGizmos()
//        {
//            var graph = GetComponent<LandmassGenerator>();
//
//            if (graph?.LocationGenerator?.Result == null) return;
//            
//            foreach (var location in graph.LocationGenerator.Result.Vertices.Skip(1))
//            {
//                var boundary = location.DetailedEdge;
//                foreach (var (a, b) in boundary.Zip(boundary.Skip(1).Append(boundary.First()), (a, b) => (a, b)))
//                {
//                    var va = new Vector3((float) a.x, location.Type.height, (float) a.y);
//                    var vb = new Vector3((float) b.x, location.Type.height, (float) b.y);
//                    
//                    Gizmos.DrawLine(va, vb);
//                }
//            }
//        }
    }
}