using System.Collections.Generic;
using UnityEngine;

namespace WPM {

    public class DemoCityTravel : MonoBehaviour {

        public GameObject prefab;
        WorldMapGlobe map;
        GlobePosAnimator anim;
        GUIStyle labelStyle, labelStyleShadow, buttonStyle, sliderStyle, sliderThumbStyle;

        float progress;

        void Start() {

            // UI Setup - non-important, only for this demo
            labelStyle = new GUIStyle();
            labelStyle.alignment = TextAnchor.MiddleCenter;
            labelStyle.normal.textColor = Color.white;
            labelStyleShadow = new GUIStyle(labelStyle);
            labelStyleShadow.normal.textColor = Color.black;
            buttonStyle = new GUIStyle(labelStyle);
            buttonStyle.alignment = TextAnchor.MiddleLeft;
            buttonStyle.normal.background = Texture2D.whiteTexture;
            buttonStyle.normal.textColor = Color.white;
            sliderStyle = new GUIStyle();
            sliderStyle.normal.background = Texture2D.whiteTexture;
            sliderStyle.fixedHeight = 4.0f;
            sliderThumbStyle = new GUIStyle();
            sliderThumbStyle.normal.background = Resources.Load<Texture2D>("thumb");
            sliderThumbStyle.overflow = new RectOffset(0, 0, 8, 0);
            sliderThumbStyle.fixedWidth = 20.0f;
            sliderThumbStyle.fixedHeight = 12.0f;

            // setup GUI resizer - only for the demo
            GUIResizer.Init(800, 500);

            // Get map instance to Globe API methods
            map = WorldMapGlobe.instance;

            NewPath();
        }


        void OnGUI() {

            // Do autoresizing of GUI layer
            GUIResizer.AutoResize();

            GUI.backgroundColor = new Color(0.1f, 0.1f, 0.3f, 0.5f);

            // Start a new path
            if (GUI.Button(new Rect(10, 10, 90, 30), "  Random Path", buttonStyle)) {
                NewPath();
            }

            // Auto mode
            if (GUI.Button(new Rect(10, 50, 90, 30), "  Auto", buttonStyle)) {
                Auto();
            }

            // Slider to show the travel progress
            GUI.Button(new Rect(150, 10, 90, 30), "  Progress", buttonStyle);
            float prevProgress = progress;
            GUI.backgroundColor = Color.white;
            progress = GUI.HorizontalSlider(new Rect(250, 20, 200, 35), progress, 0, 1, sliderStyle, sliderThumbStyle);
            GUI.backgroundColor = new Color(0.1f, 0.1f, 0.3f, 0.5f);

            if (progress != prevProgress) {
                anim.MoveTo(progress);
            }


        }


        void NewPath() {

            // Create a path consisting of a list of latitude/longitudes
            const int numLocations = 20;
            List<Vector2> latLonList = new List<Vector2>(numLocations);

            // Starting city - calling GetCityIndex without parameters returns a random visible city index
            int cityIndex = map.GetCityIndex();
            Debug.Log("Path started on " + map.GetCityFullName(cityIndex));

            // Add the city lat/lon coordinates to the list
            latLonList.Add(map.cities[cityIndex].latlon);

            // Add more cities - we'll take the 20 nearest cities
            List<int> excludeList = new List<int>(numLocations);
            excludeList.Add(cityIndex);

            for (int k = 1; k < numLocations; k++) {
                // Get the nearest city
                cityIndex = map.GetCityIndex(map.cities[cityIndex].latlon, excludeList);
                excludeList.Add(cityIndex);
                latLonList.Add(map.cities[cityIndex].latlon);
            }

            // Create the moving gameobject
            if (anim != null) {
                Destroy(anim.gameObject);
            }
            GameObject obj = Instantiate<GameObject>(prefab);
            obj.transform.localScale = Vector3.one * 0.1f;

            // Add a GlobePos animator
            anim = obj.AddComponent<GlobePosAnimator>();
            anim.latLon = latLonList;

            // Refresh path
            anim.DrawPath();

            // Update current position
            anim.MoveTo(progress);
        }

        void Auto() {
            if (anim != null) {
                anim.auto = !anim.auto;
            }
        }

    }
}