using System;
using System.Collections.Generic;
using ABI.CCK.Components;
using UnityEditor;
using UnityEditorInternal;
using UnityEngine;
using AnimatorController = UnityEditor.Animations.AnimatorController;
using AnimatorControllerParameterType = UnityEngine.AnimatorControllerParameterType;

[CustomEditor(typeof(ABI.CCK.Components.AnimatorDriver))]
public class CCK_AnimatorDriverEditor : UnityEditor.Editor
{
    private AnimatorDriver _animatorDriver;
    
    private ReorderableList _onEnterList;
    private ReorderableList _onExitList;

    private List<string> animatorParamNames = new List<string>();
    private List<string> animatorParamNamesDisplay = new List<string>();
    private List<AnimatorDriverTask.ParameterType> animatorParamTypes = new List<AnimatorDriverTask.ParameterType>();

    public override void OnInspectorGUI()
    {
        if (_animatorDriver == null) _animatorDriver = (AnimatorDriver) target;

        animatorParamNames.Clear();
        animatorParamNamesDisplay.Clear();
        animatorParamTypes.Clear();

        animatorParamNames.Add("- None -");
        animatorParamNamesDisplay.Add("- None -");
        animatorParamTypes.Add(AnimatorDriverTask.ParameterType.None);
        
        var behaviorContext = AnimatorController.FindStateMachineBehaviourContext(_animatorDriver);
        if (behaviorContext.Length > 0)
        {
            var controller = behaviorContext[0].animatorController;
            
            foreach (var parameter in controller.parameters)
            {
                switch (parameter.type)
                {
                    case AnimatorControllerParameterType.Bool:
                        animatorParamNames.Add($"{parameter.name}");
                        animatorParamNamesDisplay.Add($"{parameter.name} (Bool)");
                        animatorParamTypes.Add(AnimatorDriverTask.ParameterType.Bool);
                        break;
                    case AnimatorControllerParameterType.Float:
                        animatorParamNames.Add($"{parameter.name}");
                        animatorParamNamesDisplay.Add($"{parameter.name} (Float)");
                        animatorParamTypes.Add(AnimatorDriverTask.ParameterType.Float);
                        break;
                    case AnimatorControllerParameterType.Int:
                        animatorParamNames.Add($"{parameter.name}");
                        animatorParamNamesDisplay.Add($"{parameter.name} (Int)");
                        animatorParamTypes.Add(AnimatorDriverTask.ParameterType.Int);
                        break;
                    case AnimatorControllerParameterType.Trigger:
                        animatorParamNames.Add($"{parameter.name}");
                        animatorParamNamesDisplay.Add($"{parameter.name} (Trigger)");
                        animatorParamTypes.Add(AnimatorDriverTask.ParameterType.Trigger);
                        break;
                }
            }
        }

        if (_onEnterList == null)
        {
            _onEnterList = new ReorderableList(_animatorDriver.EnterTasks, typeof(AnimatorDriverTask),
                true, true, true, true);
            _onEnterList.drawHeaderCallback = OnDrawHeaderTaskEnter;
            _onEnterList.drawElementCallback = OnDrawElementTaskEnter;
            _onEnterList.elementHeightCallback = OnHeightElementTaskEnter;
        }

        _onEnterList.DoLayoutList();
        
        if (_onExitList == null)
        {
            _onExitList = new ReorderableList(_animatorDriver.ExitTasks, typeof(AnimatorDriverTask),
                true, true, true, true);
            _onExitList.drawHeaderCallback = OnDrawHeaderTaskExit;
            _onExitList.drawElementCallback = OnDrawElementTaskExit;
            _onExitList.elementHeightCallback = OnHeightElementTaskExit;
        }

        _onExitList.DoLayoutList();
    }

    private void OnDrawHeaderTaskEnter(Rect rect)
    {
        Rect _rect = new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight);

        GUI.Label(_rect, "On Enter State");
    }

    private void OnDrawElementTaskEnter(Rect rect, int index, bool isactive, bool isfocused)
    {
        if (index > _animatorDriver.EnterTasks.Count) return;
        AnimatorDriverTask element = _animatorDriver.EnterTasks[index];

        RenderTask(rect, element);
    }

    private float OnHeightElementTaskEnter(int index)
    {
        int length = 3;
        
        if (index > _animatorDriver.EnterTasks.Count) return 1.25f * length * EditorGUIUtility.singleLineHeight;
        AnimatorDriverTask task = _animatorDriver.EnterTasks[index];

        return (length + TaskHeight(task)) * 1.25f * EditorGUIUtility.singleLineHeight;
    }
    
    private void OnDrawHeaderTaskExit(Rect rect)
    {
        Rect _rect = new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight);

        GUI.Label(_rect, "On Exit State");
    }

    private void OnDrawElementTaskExit(Rect rect, int index, bool isactive, bool isfocused)
    {
        if (index > _animatorDriver.ExitTasks.Count) return;
        AnimatorDriverTask element = _animatorDriver.ExitTasks[index];

        RenderTask(rect, element);
    }

    private float OnHeightElementTaskExit(int index)
    {
        int length = 3;
        
        if (index > _animatorDriver.ExitTasks.Count) return 1.25f * length * EditorGUIUtility.singleLineHeight;
        AnimatorDriverTask task = _animatorDriver.ExitTasks[index];

        return (length + TaskHeight(task)) * 1.25f * EditorGUIUtility.singleLineHeight;
    }

    private int TaskHeight(AnimatorDriverTask task)
    {
        int length = 0;
        
        switch (task.aType)
        {
            case AnimatorDriverTask.SourceType.Static:
            case AnimatorDriverTask.SourceType.Parameter:
                length += 1;
                break;
            case AnimatorDriverTask.SourceType.Random:
                length += 2;
                break;
        }
        
        if (task.op != AnimatorDriverTask.Operator.Set)
        {
            length += 1;

            switch (task.bType)
            {
                case AnimatorDriverTask.SourceType.Static:
                case AnimatorDriverTask.SourceType.Parameter:
                    length += 1;
                    break;
                case AnimatorDriverTask.SourceType.Random:
                    length += 2;
                    break;
            }
        }
        
        length += 1;
        
        return length;
    }

    private void RenderTask(Rect rect, AnimatorDriverTask task)
    {
        string formulaDisplay = "";
        
        Rect _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);

        int parameterIndex = Math.Max(animatorParamNames.FindIndex(m => m == task.targetName), 0);
        EditorGUI.LabelField(_rect, "Parameter");
        _rect.x += 100;
        _rect.width = rect.width - 100;
        int selectedIndex = EditorGUI.Popup(_rect, parameterIndex, animatorParamNamesDisplay.ToArray());
        task.targetType = animatorParamTypes[selectedIndex];
        task.targetName = animatorParamNames[selectedIndex];

        formulaDisplay = $"{task.targetName} = ";
        
        rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
        _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
        
        EditorGUI.LabelField(_rect, "Operation");
        _rect.x += 100;
        _rect.width = rect.width - 100;
        task.op = (AnimatorDriverTask.Operator) EditorGUI.EnumPopup(_rect, task.op);
        
        rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
        _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
        
        EditorGUI.LabelField(_rect, "A Type");
        _rect.x += 100;
        _rect.width = rect.width - 100;
        task.aType = (AnimatorDriverTask.SourceType) EditorGUI.EnumPopup(_rect, task.aType);

        rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
        _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
        
        switch (task.aType)
        {
            case AnimatorDriverTask.SourceType.Static:
                EditorGUI.LabelField(_rect, "A Value");
                _rect.x += 100;
                _rect.width = rect.width - 100;
                task.aValue = EditorGUI.FloatField(_rect, task.aValue);

                formulaDisplay += $"{task.aValue} ";
                break;
            case AnimatorDriverTask.SourceType.Parameter:
                parameterIndex = Math.Max(animatorParamNames.FindIndex(m => m == task.aName), 0);
                EditorGUI.LabelField(_rect, "Parameter A");
                _rect.x += 100;
                _rect.width = rect.width - 100;
                selectedIndex = EditorGUI.Popup(_rect, parameterIndex, animatorParamNamesDisplay.ToArray());
                task.aParamType = animatorParamTypes[selectedIndex];
                task.aName = animatorParamNames[selectedIndex];
                
                formulaDisplay += $"{task.aName} ";
                break;
            case AnimatorDriverTask.SourceType.Random:
                EditorGUI.LabelField(_rect, "A Min");
                _rect.x += 100;
                _rect.width = rect.width - 100;
                task.aValue = EditorGUI.FloatField(_rect, task.aValue);
                
                rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
                _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
                
                EditorGUI.LabelField(_rect, "A Max");
                _rect.x += 100;
                _rect.width = rect.width - 100;
                task.aMax = Convert.ToSingle(EditorGUI.TextField(_rect, task.aMax.ToString()));
                
                formulaDisplay += $"Rand({task.aValue}, {task.aMax}) ";
                break;
        }

        if (task.op != AnimatorDriverTask.Operator.Set)
        {
            rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
            _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
            
            switch (task.op)
            {
                case AnimatorDriverTask.Operator.Addition:
                    formulaDisplay += "+ ";
                    break;
                case AnimatorDriverTask.Operator.Subtraction:
                    formulaDisplay += "- ";
                    break;
                case AnimatorDriverTask.Operator.Multiplication:
                    formulaDisplay += "* ";
                    break;
                case AnimatorDriverTask.Operator.Division:
                    formulaDisplay += "/ ";
                    break;
                case AnimatorDriverTask.Operator.Modulo:
                    formulaDisplay += "% ";
                    break;
                case AnimatorDriverTask.Operator.Power:
                    formulaDisplay += "pow ";
                    break;
                case AnimatorDriverTask.Operator.Log:
                    formulaDisplay += "log ";
                    break;
                case AnimatorDriverTask.Operator.Equal:
                    formulaDisplay += "== ";
                    break;
                case AnimatorDriverTask.Operator.LessThen:
                    formulaDisplay += "< ";
                    break;
                case AnimatorDriverTask.Operator.LessEqual:
                    formulaDisplay += "<= ";
                    break;
                case AnimatorDriverTask.Operator.MoreThen:
                    formulaDisplay += "> ";
                    break;
                case AnimatorDriverTask.Operator.MoreEqual:
                    formulaDisplay += ">= ";
                    break;
                case AnimatorDriverTask.Operator.NotEqual:
                    formulaDisplay += "!= ";
                    break;
            }
            
            EditorGUI.LabelField(_rect, "B Type");
            _rect.x += 100;
            _rect.width = rect.width - 100;
            task.bType = (AnimatorDriverTask.SourceType) EditorGUI.EnumPopup(_rect, task.bType);

            rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
            _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
            
            switch (task.bType)
            {
                case AnimatorDriverTask.SourceType.Static:
                    EditorGUI.LabelField(_rect, "B Value");
                    _rect.x += 100;
                    _rect.width = rect.width - 100;
                    task.bValue = EditorGUI.FloatField(_rect, task.bValue);

                    formulaDisplay += $"{task.bValue} ";
                    break;
                case AnimatorDriverTask.SourceType.Parameter:
                    parameterIndex = Math.Max(animatorParamNames.FindIndex(m => m == task.bName), 0);
                    EditorGUI.LabelField(_rect, "Parameter B");
                    _rect.x += 100;
                    _rect.width = rect.width - 100;
                    selectedIndex = EditorGUI.Popup(_rect, parameterIndex, animatorParamNamesDisplay.ToArray());
                    task.bParamType = animatorParamTypes[selectedIndex];
                    task.bName = animatorParamNames[selectedIndex];
                    
                    formulaDisplay += $"{task.bName} ";
                    break;
                case AnimatorDriverTask.SourceType.Random:
                    EditorGUI.LabelField(_rect, "B Min");
                    _rect.x += 100;
                    _rect.width = rect.width - 100;
                    task.bValue = EditorGUI.FloatField(_rect, task.bValue);
                    
                    rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
                    _rect = new Rect(rect.x, rect.y, 100, EditorGUIUtility.singleLineHeight);
                    
                    EditorGUI.LabelField(_rect, "B Max");
                    _rect.x += 100;
                    _rect.width = rect.width - 100;
                    task.bMax = Convert.ToSingle(EditorGUI.TextField(_rect, task.bMax.ToString()));
                    
                    formulaDisplay += $"Rand({task.bValue}, {task.bMax}) ";
                    break;
            }
        }
        
        var boldtext = new GUIStyle (GUI.skin.label);
        boldtext.fontStyle = FontStyle.Bold;
        
        rect.y += EditorGUIUtility.singleLineHeight * 1.25f;
        _rect = new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight);
        EditorGUI.LabelField(_rect, task.targetName == "- None -"?"Parameter = A":formulaDisplay, boldtext);
    }
}