using System.ComponentModel;

namespace SRDebugger.Editor
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using Internal;
    using SRF;
    using UI.Controls.Data;
    using UnityEngine;
    using UnityEditor;

    public class SROptionsWindow : EditorWindow
    {
        [MenuItem(SRDebugPaths.SROptionsMenuItemPath)]
        public static void Open()
        {
            var window = GetWindow<SROptionsWindow>(false, "SROptions", true);
            window.minSize = new Vector2(100, 100);
            window.Show();
        }

        [Serializable]
        private class CategoryState
        {
            public string Name;
            public bool IsOpen;
        }

        [SerializeField]
        private List<CategoryState> _categoryStates = new List<CategoryState>();

        private Dictionary<Type, Action<OptionDefinition>> _typeLookup;

        private Dictionary<string, List<OptionDefinition>> _options;

        private Vector2 _scrollPosition;
        private bool _queueRefresh;

        [NonSerialized] private GUIStyle _divider;
        [NonSerialized] private GUIStyle _foldout;

        public void OnInspectorUpdate()
        {
            if (EditorApplication.isPlaying && _options == null)
            {
                Populate();
                _queueRefresh = true;
            }
            else if (!EditorApplication.isPlaying && _options != null)
            {
                _options = null;
                _queueRefresh = true;
            }

            if (_queueRefresh)
            {
                Repaint();
            }

            _queueRefresh = false;
        }

        void PopulateTypeLookup()
        {
            _typeLookup = new Dictionary<Type, Action<OptionDefinition>>()
            {
                {typeof(int), OnGUI_Int},
                {typeof(float), OnGUI_Float},
                {typeof(double), OnGUI_Double},
                {typeof(string), OnGUI_String},
                {typeof(bool), OnGUI_Boolean },
                {typeof(uint), OnGUI_AnyInteger},
                {typeof(ushort), OnGUI_AnyInteger},
                {typeof(short), OnGUI_AnyInteger},
                {typeof(sbyte), OnGUI_AnyInteger},
                {typeof(byte), OnGUI_AnyInteger},
                {typeof(long), OnGUI_AnyInteger},
            };
        }

        void Populate()
        {
            if (_typeLookup == null)
            {
                PopulateTypeLookup();
            }

            _options = new Dictionary<string, List<OptionDefinition>>();
            
            foreach (var option in Service.Options.Options)
            {
                List<OptionDefinition> list;

                if (!_options.TryGetValue(option.Category, out list))
                {
                    list = new List<OptionDefinition>();
                    _options[option.Category] = list;
                }

                list.Add(option);
            }

            foreach (var kv in _options)
            {
                kv.Value.Sort((d1, d2) => d1.SortPriority.CompareTo(d2.SortPriority));
            }

            Service.Options.OptionsValueUpdated += OptionsOnOptionsValueUpdated;
        }

        private void OptionsOnOptionsValueUpdated(object sender, PropertyChangedEventArgs e)
        {
            _queueRefresh = true;
        }


        void OnGUI()
        {
            EditorGUILayout.Space();

            if (!EditorApplication.isPlayingOrWillChangePlaymode || _options == null)
            {
                EditorGUILayout.BeginHorizontal();
                GUILayout.FlexibleSpace();
                GUILayout.Label("SROptions can only be edited in play-mode.");
                GUILayout.FlexibleSpace();
                EditorGUILayout.EndHorizontal();
                return;
            }

            if (_divider == null)
            {
                _divider = new GUIStyle(GUI.skin.box);
                _divider.stretchWidth = true;
                _divider.fixedHeight = 2;
            }

            if (_foldout == null)
            {
                _foldout = new GUIStyle(EditorStyles.foldout);
                _foldout.fontStyle = FontStyle.Bold;
            }

            _scrollPosition = EditorGUILayout.BeginScrollView(_scrollPosition);

            foreach (var kv in _options)
            {
                var state = _categoryStates.FirstOrDefault(p => p.Name == kv.Key);

                if (state == null)
                {
                    state = new CategoryState()
                    {
                        Name = kv.Key,
                        IsOpen = true
                    };
                    _categoryStates.Add(state);
                }
                
                state.IsOpen = EditorGUILayout.Foldout(state.IsOpen, kv.Key, _foldout);

                if (!state.IsOpen)
                    continue;

                EditorGUILayout.BeginVertical(EditorStyles.inspectorDefaultMargins);
                OnGUI_Category(kv.Value);
                EditorGUILayout.Space();
                EditorGUILayout.EndHorizontal();
            }

            EditorGUILayout.EndScrollView();
        }

        void OnGUI_Category(List<OptionDefinition> options)
        {
            for (var i = 0; i < options.Count; i++)
            {
                var op = options[i];

                if (op.Property != null)
                {
                    OnGUI_Property(op);
                } else if (op.Method != null)
                {
                    OnGUI_Method(op);
                }
            }
        }

        void OnGUI_Method(OptionDefinition op)
        {
            if (GUILayout.Button(op.Name))
            {
                op.Method.Invoke(null);
            }
        }

        void OnGUI_Property(OptionDefinition op)
        {
            Action<OptionDefinition> method;

            if (op.Property.PropertyType.IsEnum)
            {
                method = OnGUI_Enum;
            }
            else if (!_typeLookup.TryGetValue(op.Property.PropertyType, out method))
            {
                OnGUI_Unsupported(op);
                return;
            }

            if (!op.Property.CanWrite)
            {
                EditorGUI.BeginDisabledGroup(true);
            }

            method(op);

            if (!op.Property.CanWrite)
            {
                EditorGUI.EndDisabledGroup();
            }
        }

        void OnGUI_String(OptionDefinition op)
        {
            EditorGUI.BeginChangeCheck();
            var newValue = EditorGUILayout.TextField(op.Name, (string) op.Property.GetValue());

            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }

        void OnGUI_Boolean(OptionDefinition op)
        {
            EditorGUI.BeginChangeCheck();
            var newValue = EditorGUILayout.Toggle(op.Name, (bool) op.Property.GetValue());

            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }

        void OnGUI_Enum(OptionDefinition op)
        {
            EditorGUI.BeginChangeCheck();
            var newValue = EditorGUILayout.EnumPopup(op.Name, (Enum)op.Property.GetValue());

            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }

        void OnGUI_Int(OptionDefinition op)
        {
            var range = op.Property.GetAttribute<NumberRangeAttribute>();

            int newValue;

            EditorGUI.BeginChangeCheck();

            if (range != null)
            {
                newValue = EditorGUILayout.IntSlider(op.Name, (int)op.Property.GetValue(), (int)range.Min, (int)range.Max);
            }
            else
            {
                newValue = EditorGUILayout.IntField(op.Name, (int) op.Property.GetValue());
            }

            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }

        void OnGUI_Float(OptionDefinition op)
        {
            var range = op.Property.GetAttribute<NumberRangeAttribute>();

            float newValue;

            EditorGUI.BeginChangeCheck();

            if (range != null)
            {
                newValue = EditorGUILayout.Slider(op.Name, (float)op.Property.GetValue(), (float)range.Min, (float)range.Max);
            }
            else
            {
                newValue = EditorGUILayout.FloatField(op.Name, (float) op.Property.GetValue());
            }

            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }

        void OnGUI_Double(OptionDefinition op)
        {
            var range = op.Property.GetAttribute<NumberRangeAttribute>();

            double newValue;

            EditorGUI.BeginChangeCheck();

            if (range != null && range.Min > float.MinValue && range.Max < float.MaxValue)
            {
                newValue = EditorGUILayout.Slider(op.Name, (float)op.Property.GetValue(), (float)range.Min, (float)range.Max);
            }
            else
            {
                newValue = EditorGUILayout.DoubleField(op.Name, (double) op.Property.GetValue());

                if (range != null)
                {
                    if (newValue > range.Max)
                    {
                        newValue = range.Max;
                    } else if (newValue < range.Min)
                    {
                        newValue = range.Min;
                    }
                }
            }

            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }


        void OnGUI_AnyInteger(OptionDefinition op)
        {
            NumberControl.ValueRange range;

            if (!NumberControl.ValueRanges.TryGetValue(op.Property.PropertyType, out range))
            {
                Debug.LogError("Unknown integer type: " + op.Property.PropertyType);
                return;
            }

            var userRange = op.Property.GetAttribute<NumberRangeAttribute>();

            EditorGUI.BeginChangeCheck();

            var oldValue = (long)Convert.ChangeType(op.Property.GetValue(), typeof(long));
            var newValue = EditorGUILayout.LongField(op.Name, oldValue);

            if (newValue > range.MaxValue)
            {
                newValue = (long)range.MaxValue;
            } else if (newValue < range.MinValue)
            {
                newValue = (long)range.MinValue;
            }

            if (userRange != null)
            {
                if (newValue > userRange.Max)
                {
                    newValue = (long)userRange.Max;
                } else if (newValue < userRange.Min)
                {
                    newValue = (long) userRange.Min;
                }
            }
            
            if (EditorGUI.EndChangeCheck())
            {
                op.Property.SetValue(Convert.ChangeType(newValue, op.Property.PropertyType));
            }
        }

        void OnGUI_Unsupported(OptionDefinition op)
        {
            EditorGUILayout.PrefixLabel(op.Name);
            EditorGUILayout.LabelField("Unsupported Type: {0}".Fmt(op.Property.PropertyType));
        }
    }
}