using System;
using System.Linq;
using BaseGames.Core.Events;
using UnityEditor;
using UnityEngine;

namespace BaseGames.Editor
{
    public sealed class EventBusMonitorWindow : EditorWindow
    {
        private string _filter = string.Empty;
        private bool _pauseCapture;
        private bool _autoScroll = true;
        private Vector2 _scroll;

        [MenuItem("BaseGames/Tools/Event Bus Monitor %#e")]
        public static void OpenWindow()
        {
            EventBusMonitorWindow window = GetWindow<EventBusMonitorWindow>("Event Bus Monitor");
            window.minSize = new Vector2(760f, 320f);
        }

        private void OnEnable()
        {
            EditorApplication.update += RepaintWhilePlaying;
        }

        private void OnDisable()
        {
            EditorApplication.update -= RepaintWhilePlaying;
        }

        private void OnGUI()
        {
            DrawToolbar();
            DrawHeader();
            DrawRows();
        }

        private void DrawToolbar()
        {
            using (new EditorGUILayout.HorizontalScope(EditorStyles.toolbar))
            {
                GUILayout.Label("Filter", GUILayout.Width(34f));
                _filter = GUILayout.TextField(_filter, EditorStyles.toolbarTextField, GUILayout.MinWidth(180f));

                GUILayout.Space(8f);
                _pauseCapture = GUILayout.Toggle(_pauseCapture, "Pause", EditorStyles.toolbarButton, GUILayout.Width(56f));
                _autoScroll = GUILayout.Toggle(_autoScroll, "Auto Scroll", EditorStyles.toolbarButton, GUILayout.Width(82f));

                if (GUILayout.Button("Clear", EditorStyles.toolbarButton, GUILayout.Width(48f)))
                    EventBusMonitor.Clear();

                GUILayout.FlexibleSpace();
                GUILayout.Label(EditorApplication.isPlaying ? "Play Mode" : "Edit Mode", EditorStyles.miniLabel);
            }
        }

        private void DrawHeader()
        {
            using (new EditorGUILayout.HorizontalScope())
            {
                GUILayout.Label("Time", EditorStyles.boldLabel, GUILayout.Width(80f));
                GUILayout.Label("Frame", EditorStyles.boldLabel, GUILayout.Width(60f));
                GUILayout.Label("Channel", EditorStyles.boldLabel, GUILayout.Width(220f));
                GUILayout.Label("Payload", EditorStyles.boldLabel, GUILayout.ExpandWidth(true));
                GUILayout.Label("Subs", EditorStyles.boldLabel, GUILayout.Width(48f));
            }
            EditorGUILayout.LabelField(GUIContent.none, GUI.skin.horizontalSlider);
        }

        private void DrawRows()
        {
            var records = EventBusMonitor.Records;
            if (!string.IsNullOrWhiteSpace(_filter))
            {
                records = records.Where(record =>
                    record.ChannelName.IndexOf(_filter, StringComparison.OrdinalIgnoreCase) >= 0 ||
                    record.Payload.IndexOf(_filter, StringComparison.OrdinalIgnoreCase) >= 0);
            }

            var displayRecords = records.ToArray();

            _scroll = EditorGUILayout.BeginScrollView(_scroll);
            foreach (var record in displayRecords)
                DrawRow(record);
            EditorGUILayout.EndScrollView();

            if (_autoScroll && Event.current.type == EventType.Repaint)
                _scroll.y = float.MaxValue;
        }

        private void DrawRow(EventBusMonitor.EventRecord record)
        {
            Color oldColor = GUI.color;
            if (record.ListenerCount == 0)
                GUI.color = new Color(1f, 0.65f, 0.65f);

            using (new EditorGUILayout.HorizontalScope())
            {
                GUILayout.Label(record.Timestamp.ToString("HH:mm:ss.fff"), GUILayout.Width(80f));
                GUILayout.Label($"#{record.FrameCount}", GUILayout.Width(60f));
                GUILayout.Label(record.ChannelName, GUILayout.Width(220f));
                GUILayout.Label(record.Payload, GUILayout.ExpandWidth(true));
                GUILayout.Label(record.ListenerCount.ToString(), GUILayout.Width(48f));
            }

            GUI.color = oldColor;
        }

        private void RepaintWhilePlaying()
        {
            if (!_pauseCapture)
                Repaint();
        }
    }
}