//--------------------------------------------------------
//    [Author]:           第二世界
//    [  Date ]:           Tuesday, October 31, 2017
//--------------------------------------------------------
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;

namespace Snxxz.UI
{

    public class FunctionButtonGroup : MonoBehaviour
    {
        [SerializeField] ScrollRect m_ScrollRect;

        public int unLockedCount {
            get {
                var count = 0;
                foreach (var button in functionButtons.Values)
                {
                    if (button.state != TitleBtnState.Locked)
                    {
                        count++;
                    }
                }

                return count;
            }
        }

        int currentOrder = 0;
        List<int> orders = new List<int>();
        Dictionary<int, FunctionButton> functionButtons = new Dictionary<int, FunctionButton>();

        public void Register(FunctionButton button)
        {
            functionButtons[button.order] = button;
            if (!orders.Contains(button.order))
            {
                orders.Add(button.order);
                orders.Sort(OrderCompare);
            }
        }

        public void UnRegister(FunctionButton button)
        {
            if (functionButtons.ContainsKey(button.order))
            {
                functionButtons.Remove(button.order);
            }

            if (orders.Contains(button.order))
            {
                orders.Remove(button.order);
                orders.Sort(OrderCompare);
            }

        }

        public void NotifyToggleOn(FunctionButton button)
        {
            if (button.state == TitleBtnState.Click)
            {
                currentOrder = button.order;
                for (int i = 0; i < orders.Count; i++)
                {
                    var functionButton = functionButtons[orders[i]];
                    if (functionButton != button && functionButton.state != TitleBtnState.Locked)
                    {
                        functionButton.state = TitleBtnState.Normal;
                    }
                }
            }
        }

        public void TriggerByOrder(int targetOrder)
        {
            for (int i = 0; i < orders.Count; i++)
            {
                var order = orders[i];
                if (order == targetOrder)
                {
                    functionButtons[order].Invoke(true);
                    break;
                }
            }
        }

        public void TriggerLast()
        {
            var index = orders.IndexOf(currentOrder);
            if (index < 0)
            {
                return;
            }

            var loopTimes = 0;
            while (loopTimes < 2)
            {
                index--;
                if (index < 0)
                {
                    index = orders.Count - 1;
                    loopTimes++;
                }

                var next = orders[index];
                if (functionButtons[next].state != TitleBtnState.Locked)
                {
                    functionButtons[next].Invoke(false);
                    break;
                }
            }

        }

        public void TriggerNext()
        {
            var index = orders.IndexOf(currentOrder);
            if (index < 0)
            {
                return;
            }

            var loopTimes = 0;
            while (loopTimes < 2)
            {
                index++;
                if (index > orders.Count - 1)
                {
                    index = 0;
                    loopTimes++;
                }

                var next = orders[index];
                if (functionButtons[next].state != TitleBtnState.Locked)
                {
                    functionButtons[next].Invoke(false);
                    break;
                }
            }
        }

        public bool IsFirst()
        {
            return orders.Count > 0 && currentOrder == orders[0];
        }

        public bool IsLast()
        {
            return orders.Count > 0 && currentOrder == orders[orders.Count - 1];
        }

        public void GotoOrder(int order)
        {
            if (m_ScrollRect != null)
            {
                var index = orders.IndexOf(order);
                if (m_ScrollRect.horizontal)
                {
                    m_ScrollRect.horizontalNormalizedPosition = (float)index / orders.Count;
                }
                else
                {
                    m_ScrollRect.verticalNormalizedPosition = (float)index / orders.Count;
                }
            }
        }

        private int OrderCompare(int a, int b)
        {
            return a < b ? -1 : 1;
        }
    }

}