using System.Collections.Generic;
using UnityEngine;
using sam;

public class AreaVariable3DVisualizer : MonoBehaviour
{
    MeshFilter meshFilter;
    public float planeElevation;
    public float tileWidth = 0.5f;

    protected AreaVariableSubsession avs;

    void Awake()
    {
        meshFilter = GetComponent<MeshFilter>();
        avs = GetComponentInParent<AreaVariableSubsession>();
    }

    public void OnProductSelected(ProductData data)
    {
    }

    public void OnVariableSelected(int vi)
    {
        GenerateMeshes();
    }


    void GenerateMeshes()
    {
        var mesh = new Mesh();
        mesh.name = avs.prodvar.name;

        float htw = tileWidth * 0.5f;

        List<Vector3> verts = new List<Vector3>();
        List<Color> colors = new List<Color>();
        List<int> inds = new List<int>();

        foreach (var dp in avs.latLonDictionaries[0].Values)
        {
            float lon = dp.longitude;
            float lat = dp.latitude;

            float w = lon - htw;
            float e = lon + htw;
            float s = lat - htw;
            float n = lat + htw;

            Vector3 bl = new Vector3(w, s, planeElevation);
            Vector3 br = new Vector3(e, s, planeElevation);
            Vector3 tl = new Vector3(w, n, planeElevation);
            Vector3 tr = new Vector3(e, n, planeElevation);

            bl = Utils.DegLonLatHgtToXYZ(bl, true);
            br = Utils.DegLonLatHgtToXYZ(br, true);
            tl = Utils.DegLonLatHgtToXYZ(tl, true);
            tr = Utils.DegLonLatHgtToXYZ(tr, true);

            Color col = avs.GetDataPointColor(dp);

            int vi = verts.Count;

            verts.Add(tl);
            verts.Add(tr);
            verts.Add(bl);
            verts.Add(br);

            colors.Add(col);
            colors.Add(col);
            colors.Add(col);
            colors.Add(col);

            inds.Add(vi);
            inds.Add(vi + 1);
            inds.Add(vi + 2);

            inds.Add(vi + 2);
            inds.Add(vi + 1);
            inds.Add(vi + 3);
        }

        mesh.vertices = verts.ToArray();
        mesh.colors = colors.ToArray();
        mesh.SetIndices(inds.ToArray(), MeshTopology.Triangles, 0, true);
        meshFilter.sharedMesh = mesh;
    }
}