using System;
using System.Collections.Generic;
using InfinityCode.RealWorldTerrain;
using InfinityCode.RealWorldTerrain.Windows;
using UnityEditor;
using UnityEngine;

public class AutomatorExample : EditorWindow
{
    private RealWorldTerrainContainer container;
    private List<Rule> rules = new List<Rule>();
    private Vector2 scrollPosition;
    private int status = 0; // 0 - idle, 1 - execute, 2 - finalize
    private int executeIndex = -1;
    private bool finished = false;

    private void Execute()
    {
        if (container == null) return;
        if (container.terrains == null) return;
        if (rules.Count == 0) return;

        status = 1;
        executeIndex = -1;
        ExecuteNextTerrain();
    }

    private void ExecuteNextTerrain()
    {
        int ruleIndex = -1;
        Rule activeRule = null;
        RealWorldTerrainItem item = null;

        do
        {
            executeIndex++;
            if (executeIndex == container.terrainCount)
            {
                status = 2;
                Repaint();
                return;
            }

            item = container.terrains[executeIndex];

            for (int i = 0; i < rules.Count; i++)
            {
                Rule rule = rules[i];
                if (rule.Contains(item) && rule.textureResolution != item.prefs.textureSize.x)
                {
                    activeRule = rule;
                    ruleIndex = i;
                    break;
                }
            }
        } while (activeRule == null);

        finished = false;

        Debug.Log(item + ", Rule - " + ruleIndex);

        RealWorldTerrainWindow.OpenWindow(RealWorldTerrainGenerateType.texture, item);

        RealWorldTerrainWindow.prefs.textureSize = new RealWorldTerrainVector2i(activeRule.textureResolution, activeRule.textureResolution);
        RealWorldTerrainWindow.OnCaptureCompleted += OnCaptureCompleted;
        RealWorldTerrainWindow.OnCaptureCanceled += OnCaptureCanceled;

        RealWorldTerrainWindow.StartCapture();
    }

    private void OnCaptureCanceled()
    {
        UnsubscribeFromEvents();

        status = 2;
    }

    private void OnCaptureCompleted()
    {
        UnsubscribeFromEvents();

        finished = true;
        Repaint();
    }

    private void OnGUI()
    {
        if (status == 0) OnIdleGUI();
        else if (status == 1) OnWaitGUI();
        else if (Event.current.type == EventType.Repaint)
        {
            status = 0;
            Repaint();
        }
    }

    private void OnIdleGUI()
    {
        int rulesCount = rules.Count;
        int moveUp = -1;
        int moveDown = -1;

        container = EditorGUILayout.ObjectField("RWT Container", container, typeof(RealWorldTerrainContainer), true) as RealWorldTerrainContainer;

        try
        {
            scrollPosition = EditorGUILayout.BeginScrollView(scrollPosition);
        }
        catch (Exception e)
        {
            Debug.Log(Event.current.type);
        }
        

        for (int i = 0; i < rulesCount; i++)
        {
            Rule rule = rules[i];

            EditorGUILayout.BeginHorizontal();

            EditorGUILayout.LabelField("From X", GUILayout.Width(50));
            rule.fromX = EditorGUILayout.IntField(rule.fromX);
            EditorGUILayout.LabelField("Y", GUILayout.Width(20));
            rule.fromY = EditorGUILayout.IntField(rule.fromY);

            EditorGUILayout.LabelField(" To X", GUILayout.Width(40));
            rule.toX = EditorGUILayout.IntField(rule.toX);
            EditorGUILayout.LabelField("Y", GUILayout.Width(20));
            rule.toY = EditorGUILayout.IntField(rule.toY);

            EditorGUILayout.LabelField(" Resolution", GUILayout.Width(80));
            rule.textureResolution = EditorGUILayout.IntField(rule.textureResolution);

            if (GUILayout.Button("Up", GUILayout.ExpandWidth(false))) moveUp = i;
            if (GUILayout.Button("Down", GUILayout.ExpandWidth(false))) moveDown = i;
            if (GUILayout.Button("X", GUILayout.ExpandWidth(false)))
            {
                rules.RemoveAt(i);
                rulesCount--;
            }

            EditorGUILayout.EndHorizontal();
        }

        EditorGUILayout.EndScrollView();

        if (moveUp > 0)
        {
            Rule t = rules[moveUp - 1];
            rules[moveUp - 1] = rules[moveUp];
            rules[moveUp] = t;
        }

        if (moveDown != -1 && moveDown < rulesCount - 1)
        {
            Rule t = rules[moveDown + 1];
            rules[moveDown + 1] = rules[moveDown];
            rules[moveDown] = t;
        }

        if (GUILayout.Button("Add")) rules.Add(new Rule());
        if (GUILayout.Button("Execute")) Execute();
    }

    private void OnWaitGUI()
    {
        if (finished) ExecuteNextTerrain();

        Rect rect = GUILayoutUtility.GetRect(GUIContent.none, GUI.skin.box, GUILayout.Height(20), GUILayout.ExpandWidth(true));
        float progress = (float)executeIndex / (container.terrainCount - 1);
        EditorGUI.ProgressBar(rect, progress, Mathf.FloorToInt(progress * 100) + " %");

        if (GUILayout.Button("Cancel"))
        {
            status = 2;
            RealWorldTerrainWindow.CancelCapture();
        }
    }

    [MenuItem("RWT/Automator")]
    private static void OpenWindow()
    {
        GetWindow<AutomatorExample>();
    }

    private void UnsubscribeFromEvents()
    {
        RealWorldTerrainWindow.OnCaptureCompleted -= OnCaptureCompleted;
        RealWorldTerrainWindow.OnCaptureCanceled -= OnCaptureCanceled;
    }

    internal class Rule
    {
        public int fromX;
        public int fromY;
        public int toX;
        public int toY;
        public int textureResolution = 256;

        public bool Contains(RealWorldTerrainItem item)
        {
            return fromX <= item.x && toX >= item.x && fromY <= item.y && toY >= item.y;
        }
    }
}