using Godot;
using System;
using System.Collections.Generic;

public enum LabelConsoleMessageType {
    Normal,
    Highlight,
    Error
}

public class ConsolePanel : Control {
    private LineEdit mCmdInput;
    private ScrollContainer mScrollbar;
    private VBoxContainer mMessageContainer;
    private PackedScene mTemplateLabelConsole;
    private Queue<LabelConsole> mMessageQueue = new Queue<LabelConsole>();
    private readonly int QUEUE_MAX_SIZE = 100;

    public override void _Ready() {
        mTemplateLabelConsole = ResourceLoader.Load<PackedScene>("res://scenes/user_interface/LabelConsole.tscn");

        mCmdInput = GetNode<LineEdit>("CommandInput");
        mScrollbar = GetNode<ScrollContainer>("ScrollSet/Scrollbar");
        mMessageContainer = GetNode<VBoxContainer>("ScrollSet/Scrollbar/MessageContainer");
        mCmdInput.Connect("text_entered", this, nameof(Proc_LineEdit_TextEntered));

        BallanceStalkerCore.StalkerManager.Singleton.EventControllerChanged += Proc_StalkerManager_EventControllerChanged;
    }

    private void Proc_StalkerManager_EventControllerChanged(BallanceStalkerCore.EventControllerSource obj) {
        if (obj == BallanceStalkerCore.EventControllerSource.Chat) {
            this.Visible = true;
            mCmdInput.GrabFocus();
        } else if (obj == BallanceStalkerCore.EventControllerSource.Console) {
            // same process of chat
            // but only add a extra preset charcater in cmd input
            this.Visible = true;
            mCmdInput.Text = "/";
            mCmdInput.CaretPosition = 1;
            mCmdInput.GrabFocus();
        } else {
            this.Visible = false;
        }
    }

    public override void _Input(InputEvent @event) {
        if (!this.Visible) return;

        if (@event.IsActionPressed("ballance_esc")) {
            // clean input
            mCmdInput.Text = "";
            // back to camera
            BallanceStalkerCore.StalkerManager.Singleton.SetEventController(BallanceStalkerCore.EventControllerSource.None);
            // mark handled to prevent loop call
            GetTree().SetInputAsHandled();
        }
    }

    private void AddMessage(string strl, LabelConsoleMessageType t) {
        LabelConsole target;
        if (mMessageQueue.Count > QUEUE_MAX_SIZE) {
            // popup last item and remove it from scene first
            target = mMessageQueue.Dequeue();
            mMessageContainer.RemoveChild(target);
        } else {
            target = mTemplateLabelConsole.Instance<LabelConsole>();
        }

        // add into scene and queue
        mMessageQueue.Enqueue(target);
        mMessageContainer.AddChild(target);

        // set text
        target.SetText(strl, t);

        // scroll to bottom
        //var bar = mScrollbar.GetVScrollbar();
        //bar.Value = bar.MaxValue;
        mScrollbar.ScrollVertical = (int)mScrollbar.GetVScrollbar().MaxValue;
    }

    private void Proc_LineEdit_TextEntered(string new_strl) {
        if (new_strl != string.Empty) {
            // todo: finish cmd parse
            if (new_strl.StartsWith("/")) {
                AddMessage(new_strl, LabelConsoleMessageType.Highlight);
            } else if (new_strl.StartsWith("!")) {
                AddMessage(new_strl, LabelConsoleMessageType.Error);
            } else {
                AddMessage(new_strl, LabelConsoleMessageType.Normal);
            }

            // clean cmd
            mCmdInput.Text = "";
        }
    }

}