using AC2RE.Definitions;
using LandblockExtraction.AtlasMaker;
using LandblockExtraction.DatEngine;
using LandblockExtraction.Tools;
using System.Numerics;

namespace LandblockExtraction.WorldMap;
public class WorldMap {
    private readonly int NumberLandBlocks = 254;
    private readonly int BlockSize = 17;
    private readonly int cellSize = 8;

    private PortalEngine portalEngine;
    private CellEngine cellEngine;
    private TerrainAtlasManager terrainAtlasManager;

    private VertexMap[,] vertexMaps;

    public WorldMap(PortalEngine portalEngine, CellEngine cellEngine) {
        this.portalEngine = portalEngine;
        this.cellEngine = cellEngine;

        terrainAtlasManager = new TerrainAtlasManager(portalEngine);

        int globalSize = NumberLandBlocks * (BlockSize - 1);
        vertexMaps = new VertexMap[globalSize, globalSize];
    }
    private void InitializeBaseMap() {
        for (int landY = 0; landY <= NumberLandBlocks; landY++) {
            for (int landX = 0; landX <= NumberLandBlocks; landX++) {
                InitializeCellMap(landY, landX);
            }
        }
    }
    public void LoadRegion(int start, int end) {
        for (int landY = start; landY <= end; landY++) {
            for (int landX = start; landX <= end; landX++) {
                InitializeCellMap(landY, landX);
            }
        }
    }
    private void InitializeCellMap(int landx, int landy) {
        CellId landBlockId = new CellId((byte)landx, (byte)landy, 0xFF, 0xFF);
        var landBlock = cellEngine.GetLandBlockData(landBlockId.id);

        for (int y = 0; y < BlockSize; y++) {
            for (int x = 0; x < BlockSize; x++) {
                float height = 0;
                Vector4 color = Vector4.Zero;

                // Calculer les indices globaux en prenant en compte la position du land
                int indiceX = landx * (BlockSize - 1) + y;
                int indiceY = landy * (BlockSize - 1) + x;

                if (landBlock != null) {
                    height = GetHeightInLandBlock(landBlock, x, y);
                    color = GetColorVertex(landBlock, x, y);
                }

                // Vérifier si les indices ne dépassent pas la taille globale de la grille
                if (indiceX < NumberLandBlocks * (BlockSize - 1) && indiceY < NumberLandBlocks * (BlockSize - 1)) {
                    vertexMaps[indiceX, indiceY] = new VertexMap() {
                        Position = GenerateVertexPosition(landx, landy, x, y, height),
                        Color = color
                    };
                }
            }
        }
    }

    private float GetHeightInLandBlock(CLandBlockData block, int x, int y) {
        var indice = y * BlockSize + x;
        return block.heights[indice];
    }
    private Vector4 GetColorVertex(CLandBlockData block, int x, int y) {
        var indice = y * BlockSize + x;
        var terrain = MathOperations.GetTerrainInCellInfo(block.cellInfos[indice]);
        return terrainAtlasManager.terrains[(int)terrain].subTerrains.First().Color;
    }
    public float[] GetAllVertices() {
        List<float> verticesList = new List<float>();

        int rowLength = NumberLandBlocks * (BlockSize - 1);
        for (int y = 0; y < rowLength; y++) {
            for (int x = 0; x < rowLength; x++) {

                // Ajouter la position du vertex à la liste
                verticesList.Add(vertexMaps[x, y].Position.X);
                verticesList.Add(vertexMaps[x, y].Position.Y);
                verticesList.Add(vertexMaps[x, y].Position.Z);

                // Ajouter la couleur si nécessaire
                verticesList.Add(vertexMaps[x, y].Color.X);
                verticesList.Add(vertexMaps[x, y].Color.Y);
                verticesList.Add(vertexMaps[x, y].Color.Z);
                verticesList.Add(vertexMaps[x, y].Color.W);
            }
        }

        return verticesList.ToArray();
    }
    public int[] GenerateRegionIndices(int start, int end) {
        List<int> indices = new List<int>();

        // Calcul de la longueur de la ligne pour la région spécifiée
        int rowLength = (end - start) * (BlockSize - 1);

        // Parcours de chaque "cellule" de la grille pour la région spécifiée
        for (int y = 0; y < rowLength; y++) {
            for (int x = 0; x < rowLength; x++) {
                int baseX = start * (BlockSize - 1);
                int baseY = start * (BlockSize - 1);

                int topLeft = (y + baseY) * (NumberLandBlocks * (BlockSize - 1)) + (x + baseX);
                int topRight = topLeft + 1;
                int bottomLeft = topLeft + (NumberLandBlocks * (BlockSize - 1));
                int bottomRight = bottomLeft + 1;

                indices.Add(topLeft);
                indices.Add(bottomLeft);
                indices.Add(bottomRight);

                indices.Add(bottomLeft);
                indices.Add(bottomRight);
                indices.Add(topRight);
            }
        }

        return indices.ToArray();
    }
    public int[] GenerateIndices() {
        List<int> indices = new List<int>();

        int rowLength = NumberLandBlocks * (BlockSize - 1);

        // Parcourir chaque "cellule" de la grille, sauf la dernière colonne et la dernière ligne
        for (int y = 0; y < rowLength - 1; y++) {
            for (int x = 0; x < rowLength - 1; x++) {
                // Calculer les indices des 4 sommets du carré courant
                int topLeft = y * rowLength + x;
                int topRight = topLeft + 1;
                int bottomLeft = topLeft + rowLength;
                int bottomRight = bottomLeft + 1;

                // Ajouter les indices pour former les deux triangles
                indices.Add(topLeft);
                indices.Add(bottomLeft);
                indices.Add(bottomRight);

                indices.Add(bottomLeft);
                indices.Add(bottomRight);
                indices.Add(topRight);
            }
        }

        return indices.ToArray();
    }
    private Vector3 GenerateVertexPosition(int landx, int landy, int x, int y, float height) {
        int tmpx = (landx * BlockSize + y) * cellSize;
        int tmpy = (BlockSize * NumberLandBlocks * cellSize) - ((landy * BlockSize + x) * cellSize) - 1;
        var newX = (tmpx - (NumberLandBlocks * BlockSize * cellSize / 2)) - landx * cellSize;// (tmpx - (NumberLandBlocks * BlockSize * cellSize / 2));
        var newY = (tmpy - ((NumberLandBlocks * BlockSize * cellSize) - (NumberLandBlocks * BlockSize * cellSize / 2) - 1)) + landy * cellSize; //(tmpy - ((NumberLandBlocks * BlockSize * cellSize) - (NumberLandBlocks * BlockSize * cellSize / 2) - 1));
        return new Vector3(newX + 1020, height, newY - 1020);
    }
}