using UnityEngine;
using UnityEngine.UI;
using TowerDefense.UI.HUD;
using DG.Tweening;
using TowerDefense.Towers.Placement;
using UnityEngine.SceneManagement;
using TowerDefense.Level;

/**
 * 无尽模式结算
 * @Author: chenxin
 * @Date: 2020-10-19 17:11:03
 */
namespace KTGMGemClient
{
    public class EndlessSettlement : MonoBehaviour
    {
        public AudioClip VictoryAudio;

        public AudioSource AudioSource;

        /// <summary>
        /// Name of level select screen
        /// </summary>
        public string menuSceneName = "MainManuScene";

        /// <summary>
        /// Reference to the <see cref="EndlessLevelManager" />
        /// </summary>
        protected EndlessLevelManager levelManager;

        /// <summary>
        /// 最终波次文本
        /// </summary>
        public Text FinalWaveText;

        /// <summary>
        /// 道具列表UI
        /// </summary>
        public GameObject PropListUI;

        public GameObject SettlementUI;

        public void Init()
        {
            LazyLoad();
            levelManager.LevelCompleted -= Victory;
            levelManager.LevelCompleted += Victory;
        }

        /// <summary>
        /// 回到主界面的功能，暂时也使用重新开启新关卡.
        /// </summary>
        public void ReturnToMainMenu()
        {
            if (GameConfig.IsNewbieGuideCompleted)
                GameConfig.IsNewbie = false;

            // 清空所有Tween数据:
            DOTween.Clear();
            EndlessUIStart.bFirstLoaded = false;
            EndlessUIStart.bGameStart = false;

            TowerPlacementGridEndless.GRID_OPENCASH = 100;

            SafelyUnsubscribe();
            SceneManager.LoadScene(menuSceneName);
        }

        /// <summary>
        /// Shows the end game screen
        /// </summary>
        protected void OpenEndGameScreen(bool victory)
        {
            if (!EndlessGameUI.instanceExists) return;

            if (EndlessGameUI.instance.state == EndlessGameUI.State.Building)
                EndlessGameUI.instance.CancelGhostPlacement();

            RefreshFinalWave();
            RefreshPropList();
            SettlementUI.SetActive(true);
        }

        /// <summary>
        /// Occurs when the level is sucessfully completed
        /// </summary>
        protected void Victory()
        {
            EndlessUIStart.instance.Pause();
            OpenEndGameScreen(true);
            if (VictoryAudio != null && AudioSource != null)
                AudioSource.PlayOneShot(VictoryAudio);
        }

        /// <summary>
        /// Safely unsubscribes from <see cref="EndlessLevelManager" /> events.
        /// </summary>
        protected void OnDestroy()
        {
            SafelyUnsubscribe();
            if (EndlessGameUI.instanceExists)
                EndlessGameUI.instance.Unpause();
        }

        // <summary>
        /// Ensure that <see cref="EndlessLevelManager" /> events are unsubscribed from when necessary
        /// </summary>
        protected void SafelyUnsubscribe()
        {
            LazyLoad();
            levelManager.LevelCompleted -= Victory;
        }

        /// <summary>
        /// Ensure <see cref="EndlessLevelManager" /> is not null
        /// </summary>
        protected void LazyLoad()
        {
            if (levelManager == null && EndlessLevelManager.instanceExists)
                levelManager = EndlessLevelManager.instance;
        }

        /// <summary>
        /// 刷新最终波次信息
        /// </summary>
        /// <param name="level">关卡等级</param>
        /// <param name="wave">波次</param>
        private void RefreshFinalWave()
        {
            int level = EndlessLevelManager.instance.CurrentLevel;
            int wave = EndlessLevelManager.instance.WaveManager.CurrentWaveIndex;

            FinalWaveText.text = $"最终波次：第{level}关，第{wave}波";
        }

        private void RefreshPropList()
        {
            EndlessSettlementPropList list = PropListUI.GetComponent<EndlessSettlementPropList>();
            list.RefreshList();
        }
    }
}