using Barotrauma.Extensions;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Barotrauma.Networking
{
    public partial class ServerLog
    {
        const int MaxLines = 500;

        public GUIButton LogFrame;
        private GUIListBox listBox;
        private GUIButton reverseButton;

        private string msgFilter;

        private bool reverseOrder = false;

        private readonly bool[] msgTypeHidden = new bool[Enum.GetValues(typeof(MessageType)).Length];

        private bool OnReverseClicked(GUIButton btn, object obj)
        {
            SetMessageReversal(!reverseOrder);

            return false;
        }

        public void CreateLogFrame()
        {
            LogFrame = new GUIButton(new RectTransform(Vector2.One, GUI.Canvas, Anchor.Center), style: null)
            {
                OnClicked = (btn, userdata) => { if (GUI.MouseOn == btn || GUI.MouseOn == btn.TextBlock) LogFrame = null; return true; }
            };

            new GUIFrame(new RectTransform(GUI.Canvas.RelativeSize, LogFrame.RectTransform, Anchor.Center), style: "GUIBackgroundBlocker");

            new GUIButton(new RectTransform(Vector2.One, LogFrame.RectTransform), "", style: null).OnClicked += (btn, userData) =>
            {
                LogFrame = null;
                return true;
            };

            GUIFrame innerFrame = new GUIFrame(new RectTransform(new Vector2(0.5f, 0.5f), LogFrame.RectTransform, Anchor.Center) { MinSize = new Point(700, 500) });
            GUIFrame paddedFrame = new GUIFrame(new RectTransform(new Vector2(0.95f, 0.9f), innerFrame.RectTransform, Anchor.Center), style: null);

            // left column ----------------

            var tickBoxContainer = new GUILayoutGroup(new RectTransform(new Vector2(0.25f, 1.0f), paddedFrame.RectTransform, Anchor.BottomLeft));
            int y = 30;
            List<GUITickBox> tickBoxes = new List<GUITickBox>();
            foreach (MessageType msgType in Enum.GetValues(typeof(MessageType)))
            {
                var tickBox = new GUITickBox(new RectTransform(new Point(tickBoxContainer.Rect.Width, 30), tickBoxContainer.RectTransform), TextManager.Get("ServerLog." + messageTypeName[msgType]), font: GUIStyle.SmallFont)
                {
                    Selected = true,
                    TextColor = messageColor[msgType],
                    OnSelected = (GUITickBox tb) =>
                    {
                        msgTypeHidden[(int)msgType] = !tb.Selected;
                        FilterMessages();
                        return true;
                    }
                };
                tickBox.TextBlock.SelectedTextColor = tickBox.TextBlock.TextColor;
                tickBox.Selected = !msgTypeHidden[(int)msgType];
                tickBoxes.Add(tickBox);

                y += 20;
            }

            tickBoxes.Last().TextBlock.RectTransform.SizeChanged += () =>
            {
                GUITextBlock.AutoScaleAndNormalize(tickBoxes.Select(t => t.TextBlock), defaultScale: 1.0f);
            };

            // right column ----------------

            var rightColumn = new GUILayoutGroup(new RectTransform(new Vector2(0.75f, 1.0f), paddedFrame.RectTransform, Anchor.CenterRight), childAnchor: Anchor.TopRight)
            {
                Stretch = true,
                RelativeSpacing = 0.02f
            };

            GUILayoutGroup filterArea = new GUILayoutGroup(new RectTransform(new Vector2(1.0f, 0.05f), rightColumn.RectTransform, Anchor.TopRight),
                isHorizontal: true, childAnchor: Anchor.CenterLeft);

            new GUITextBlock(new RectTransform(new Vector2(0.2f, 1.0f), filterArea.RectTransform), TextManager.Get("ServerLog.Filter"), 
                font: GUIStyle.SubHeadingFont);            
            GUITextBox searchBox = new GUITextBox(new RectTransform(new Vector2(0.8f, 1.0f), filterArea.RectTransform), font: GUIStyle.SmallFont, createClearButton: true);
            searchBox.OnTextChanged += (textBox, text) =>
            {
                msgFilter = text;
                FilterMessages();
                return true;
            };
            GUI.KeyboardDispatcher.Subscriber = searchBox;
            filterArea.RectTransform.MinSize = new Point(0, filterArea.RectTransform.Children.Max(c => c.MinSize.Y));

            GUILayoutGroup listBoxLayout = new GUILayoutGroup(new RectTransform(new Vector2(1.0f, 0.95f), rightColumn.RectTransform))
            {
                Stretch = true,
                RelativeSpacing = 0.0f
            };

            reverseButton = new GUIButton(new RectTransform(new Vector2(1.0f, 0.05f), listBoxLayout.RectTransform), style: "UIToggleButtonVertical");
            reverseButton.Children.ForEach(c => c.SpriteEffects = reverseOrder ? SpriteEffects.FlipVertically : SpriteEffects.None);
            reverseButton.OnClicked = OnReverseClicked;

            listBox = new GUIListBox(new RectTransform(new Vector2(1.0f, 0.95f), listBoxLayout.RectTransform))
            {
                AutoHideScrollBar = false
            };

            GUIButton closeButton = new GUIButton(new RectTransform(new Vector2(0.25f, 0.05f), rightColumn.RectTransform), TextManager.Get("Close"))
            {
                OnClicked = (button, userData) =>
                {
                    LogFrame = null;
                    return true;
                }
            };

            rightColumn.Recalculate();

            var currLines = lines.ToList();
            foreach (LogMessage line in currLines)
            {
                AddLine(line);
            }
            FilterMessages();

            listBox.UpdateScrollBarSize();

            //scrolled all the way down by default
            listBox.BarScroll = 1.0f;             
            
            msgFilter = "";
        }

        public void AssignLogFrame(GUIButton inReverseButton, GUIListBox inListBox, GUIComponent tickBoxContainer, GUITextBox searchBox)
        {
            searchBox.OnTextChanged += (textBox, text) =>
            {
                msgFilter = text;
                FilterMessages();
                return true;
            };

            tickBoxContainer.ClearChildren();

            List<GUITickBox> tickBoxes = new List<GUITickBox>();
            foreach (MessageType msgType in Enum.GetValues(typeof(MessageType)))
            {
                var tickBox = new GUITickBox(new RectTransform(new Point(tickBoxContainer.Rect.Width, (int)(25 * GUI.Scale)), tickBoxContainer.RectTransform), 
                    TextManager.Get("ServerLog." + messageTypeName[msgType]).Fallback(messageTypeName[msgType]), 
                    font: GUIStyle.SmallFont)
                {
                    Selected = true,
                    TextColor = messageColor[msgType],
                    OnSelected = (GUITickBox tb) =>
                    {
                        msgTypeHidden[(int)msgType] = !tb.Selected;
                        FilterMessages();
                        return true;
                    }
                };
                tickBox.TextBlock.SelectedTextColor = tickBox.TextBlock.TextColor;
                tickBox.Selected = !msgTypeHidden[(int)msgType];
                tickBoxes.Add(tickBox);
            }
            tickBoxes.Last().TextBlock.RectTransform.SizeChanged += () =>
            {
                GUITextBlock.AutoScaleAndNormalize(tickBoxes.Select(t => t.TextBlock), defaultScale: 1.0f);
            };

            inListBox.ClearChildren();
            listBox = inListBox;

            reverseButton = inReverseButton;
            reverseButton.Children.ForEach(c => c.SpriteEffects = reverseOrder ? SpriteEffects.FlipVertically : SpriteEffects.None);
            reverseButton.OnClicked = OnReverseClicked;

            var currLines = lines.ToList();
            foreach (LogMessage line in currLines)
            {
                AddLine(line);
            }
            FilterMessages();

            listBox.UpdateScrollBarSize();
        }

        private void AddLine(LogMessage line)
        {
            float prevSize = listBox.BarSize;

            GUIComponent firstVisibleLine = listBox.Content.Children.FirstOrDefault(c => c.Rect.Y > listBox.Content.Rect.Y);
            int firstVisibileYPos = firstVisibleLine?.Rect.Y ?? 0;

            while (listBox.Content.CountChildren > MaxLines)
            {
                listBox.Content.RemoveChild(reverseOrder ? listBox.Content.Children.Last() : listBox.Content.Children.First());                
            }

            GUIFrame textContainer = null;

            Anchor anchor = Anchor.TopLeft;
            Pivot pivot = Pivot.TopLeft;
            RichString richString = line.Text;
            if (richString != null && richString.RichTextData.HasValue)
            {
                foreach (var data in richString.RichTextData.Value)
                {
                    Client client = data.ExtractClient();
                    if (client != null && client.Karma < 40.0f)
                    {
                        textContainer = new GUIFrame(new RectTransform(new Vector2(1.0f, 0.0f), listBox.Content.RectTransform),
                                style: null, color: new Color(0xff111155))
                        {
                            CanBeFocused = false
                        };
                        anchor = Anchor.CenterLeft;
                        pivot = Pivot.CenterLeft;
                        break;
                    }
                }
            }

            var textBlock = new GUITextBlock(new RectTransform(new Vector2(1.0f, 0.0f), (textContainer ?? listBox.Content).RectTransform, anchor, pivot),
                line.Text, wrap: true, font: GUIStyle.SmallFont)
            {
                TextColor = messageColor[line.Type],
                Visible = !ShouldFilterMessage(line),
                CanBeFocused = false,
                UserData = line
            };

            if (textContainer != null)
            {
                textContainer.RectTransform.NonScaledSize = new Point(textContainer.RectTransform.NonScaledSize.X, textBlock.RectTransform.NonScaledSize.Y + 5);
                textBlock.SetTextPos();
                textBlock.RectTransform.Resize(textContainer.RectTransform.NonScaledSize);
            }

            if (reverseOrder)
            {
                textBlock.RectTransform.SetAsFirstChild();
            }

            if (richString != null && richString.RichTextData.HasValue)
            {
                foreach (var data in richString.RichTextData.Value)
                {
                    textBlock.ClickableAreas.Add(new GUITextBlock.ClickableArea()
                    {
                        Data = data,
                        OnClick = GameMain.NetLobbyScreen.SelectPlayer,
                        OnSecondaryClick = GameMain.NetLobbyScreen.ShowPlayerContextMenu
                    });
                }
            }

            //if the list was scrolled to the bottom, or to the top while the list wasn't full yet,
            //keep it scrolled to the bottom
            if ((MathUtils.NearlyEqual(prevSize, 1.0f) && MathUtils.NearlyEqual(listBox.BarScroll, 0.0f)) || 
                (prevSize < 1.0f && MathUtils.NearlyEqual(listBox.BarScroll, 1.0f)))
            {
                listBox.BarScroll = 1.0f;
            }
            //otherwise modify the scroll so the topmost element stays where it was (list doesn't jump as new lines are added when scrolled up)
            else if (firstVisibleLine != null)
            {
                listBox.UpdateScrollBarSize();
                listBox.RecalculateChildren();
                int diff = firstVisibleLine.Rect.Y - firstVisibileYPos;
                if (diff != 0)
                {
                    listBox.BarScroll += diff / listBox.TotalSize * (prevSize / listBox.BarSize);
                }
            }
        }

        private bool FilterMessages()
        {
            foreach (GUIComponent child in listBox.Content.Children)
            {
                if (child is not GUITextBlock) { continue; }
                child.Visible = true;
                child.Visible = !ShouldFilterMessage((LogMessage)child.UserData);
            }
            listBox.UpdateScrollBarSize();
            listBox.BarScroll = 1.0f;

            return true;
        }

        private bool ShouldFilterMessage(LogMessage message)
        {
            if (msgTypeHidden[(int)message.Type]) { return true; }
            string text = message.Text.SanitizedValue;
            return !string.IsNullOrEmpty(msgFilter) && !text.Contains(msgFilter, StringComparison.InvariantCultureIgnoreCase);
        }

        private void SetMessageReversal(bool reverse)
        {
            if (reverseOrder == reverse) { return; }

            reverseOrder = reverse;
            reverseButton.Children.ForEach(c => c.SpriteEffects = reverseOrder ? SpriteEffects.FlipVertically : SpriteEffects.None);

            listBox.Content.RectTransform.ReverseChildren();
        }

        public bool ClearFilter(GUIComponent button, object _)
        {
            var searchBox = button.UserData as GUITextBox;
            if (searchBox != null) { searchBox.Text = ""; }

            msgFilter = "";
            FilterMessages();

            return true;
        }

    }
}