using LibW4M.Data;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace W4Gui.Components
{
    public partial class CollectiveListBox : ListBox
    {
        public CollectiveListBox()
        {
            this.SelectedIndexChanged += selectedIndexChanged;
        }
        private bool blockEventTriggers = false;
        private int totalUntitled = 0;
        private int lastSelected = -1;
        public int LastSelected
        {
            get
            {
                return lastSelected;
            }
        }
        public int CurrentlySelected
        {
            get
            {
                return this.SelectedIndex;
            }
        }

        public bool IsItemSelected
        {
            get
            {
                return this.CurrentlySelected >= 0;
            }
        }

        private void unselectWithoutSaveTrigger()
        {
            toggleEvents();
            this.lastSelected = -1;
            this.SelectedIndex = -1;
            toggleEvents();
        }


        public event EventHandler<EventArgs> Unselected;
        public event EventHandler<EventArgs> Selected;

        private void toggleEvents()
        {
            this.blockEventTriggers = !this.blockEventTriggers;
        }
        protected virtual void OnUnselected(EventArgs e)
        {
            EventHandler<EventArgs> handler = Unselected;
            if (handler != null && !blockEventTriggers)
            {
                handler(this, e);
            }
        }
        protected virtual void OnSelected(EventArgs e)
        {
            EventHandler<EventArgs> handler = Selected;
            if (handler != null && !blockEventTriggers)
            {
                handler(this, e);
            }
        }

        private void selectedIndexChanged(object? sender, EventArgs e)
        {
            if (LastSelected >= 0 && LastSelected != CurrentlySelected)
                OnUnselected(e);

            if (CurrentlySelected >= 0 && LastSelected != CurrentlySelected)
                OnSelected(e);

            lastSelected = CurrentlySelected;
        }

        public void Add(string name)
        {
            this.Items.Add(name);
        }

        public void Delete(int idx)
        {
            toggleEvents();

            int selIndx = this.SelectedIndex;

            unselectWithoutSaveTrigger();
            this.Items.RemoveAt(idx);

            toggleEvents();

            if (selIndx == idx)
            {
                if((selIndx - 1) < 0 && this.Items.Count > 0)
                {
                    this.SelectedIndex = 0;
                }
                else if(selIndx > (this.Items.Count - 1))
                {
                    this.SelectedIndex = this.Items.Count - 1;
                }
                else
                {
                    this.SelectedIndex = selIndx;
                }
            }


        }

        private string processName(string name)
        {
            if(name == "")
            {
                totalUntitled++;
                return "Untitled " + totalUntitled.ToString();
            }
            return name;
        }

        public void UpdateName(int idx, string name)
        {
            if (idx >= this.Items.Count) return;
            if (idx < 0) return;

            if(name != "")
            {
                toggleEvents();
                this.Items[idx] = name;
                toggleEvents();
            }
        }

        public void LoadArray(SaveDataEntry[] arr)
        {
            toggleEvents();
            unselectWithoutSaveTrigger();
            this.Items.Clear();
            for (int i = 0; i < arr.Length; i++)
            {
                string name = arr[i].FriendlyName;
                this.Items.Add(processName(name));
            }
            toggleEvents();
        }

        public void LoadCollective(SaveDataCollective collective)
        {
            toggleEvents();
            unselectWithoutSaveTrigger();
            this.Items.Clear();
            for (int i = 0; i < collective.Length; i++)
            {
                string name = collective[i].FriendlyName;
                this.Items.Add(processName(name));
            }
            toggleEvents();
        }

    }
}