using JetBrains.Annotations;
using NEG.UI.UnityUi.Buttons;
using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;


namespace NEG.UI.UnityUi
{
    [PublicAPI]
    public class CarouselList : MonoBehaviour
    {
        public event Action<int> OnSelectedItemChanged;
        /// <summary>
        /// Current option
        /// </summary>
        public string CurrentOption { get; private set; }
        
        /// <summary>
        /// Current selected option id
        /// </summary>
        public int CurrentOptionId { get; private set; }

        [SerializeField] private BaseButton nextButton;
        [SerializeField] private BaseButton prevButton;
        [SerializeField] private TMP_Text currentOptionText;

        private List<string> options;

        /// <summary>
        /// Sets new options list, automatically first will be selected.
        /// </summary>
        /// <param name="options">list of options names</param>
        public void SetOptions(List<string> options)
        {
            this.options = options;
            SelectOption(0);
        }

        public void SelectNextOption() => ChangeOption(true);
        public void SelectPrevOption() => ChangeOption(false);
        
        /// <summary>
        /// Selects option with provided id.
        /// </summary>
        /// <param name="option">option number</param>
        public void SelectOption(int option)
        {
            if (option < 0 || option >= options.Count)
            {
                Debug.LogError("Invalid option number");
                return;
            }
            CurrentOptionId = option;
            CurrentOption = options[option];
            currentOptionText.text = CurrentOption;
            OnSelectedItemChanged?.Invoke(CurrentOptionId);
        }

        /// <summary>
        /// Select option with provided value. Use with caution, better use <see cref="SelectOption(int)"/>.
        /// </summary>
        /// <param name="option">option value to select</param>
        public void SelectOption(string option)
        {
            if (options.Count == 0)
            {
                Debug.LogError("Carousel List cannot be empty when selecting option");
                return;
            }

            int index = options.IndexOf(option);
            if (index == -1)
            {
                Debug.LogError($"Option {option} not found");
                return;
            }
            
            SelectOption(index);
        }

        private void Awake()
        {
            nextButton.OnButtonPressed += SelectNextOption;
            prevButton.OnButtonPressed += SelectPrevOption;
        }

        private void OnDestroy()
        {
            nextButton.OnButtonPressed -= SelectNextOption;
            prevButton.OnButtonPressed -= SelectPrevOption;
        }

        private void ChangeOption(bool next) => SelectOption((CurrentOptionId + (next ? 1 : -1) + options.Count) % options.Count);
    }
}