using TMPro;
using UnityEngine;
using UnityEngine.UI;
using WarGame.Managers;

namespace WarGame.UI
{
    public class BattleHUD : MonoBehaviour
    {
        [Header("Ongoing Unit Count Display")]
        [SerializeField] private TMP_Text playerUnitsCountText;
        [SerializeField] private TMP_Text enemyUnitsCountText;

        [Header("Round & State Display")]
        [SerializeField] private TMP_Text waveTitleText;
        [SerializeField] private TMP_Text battleStatusText;

        [Header("Controls")]
        [SerializeField] private Button startBattleButton;
        [SerializeField] private Button speed1xButton;
        [SerializeField] private Button speed2xButton;
        [SerializeField] private Button speed4xButton;

        private void Start()
        {
            if (BattleManager.Instance != null)
            {
                BattleManager.Instance.OnUnitCountsChanged += UpdateOngoingUnitCounts;
                BattleManager.Instance.OnBattleStateChanged += HandleBattleStateChanged;
                BattleManager.Instance.OnWaveChanged += UpdateWaveDisplay;

                UpdateWaveDisplay(BattleManager.Instance.CurrentWave);
                UpdateOngoingUnitCounts(BattleManager.Instance.PlayerAliveCount, BattleManager.Instance.EnemyAliveCount);
                HandleBattleStateChanged(BattleManager.Instance.CurrentBattleState);
            }

            if (startBattleButton != null)
            {
                startBattleButton.onClick.AddListener(OnStartBattleClicked);
            }

            if (speed1xButton != null) speed1xButton.onClick.AddListener(() => SetGameSpeed(1f));
            if (speed2xButton != null) speed2xButton.onClick.AddListener(() => SetGameSpeed(2f));
            if (speed4xButton != null) speed4xButton.onClick.AddListener(() => SetGameSpeed(4f));
        }

        private void OnDestroy()
        {
            if (BattleManager.Instance != null)
            {
                BattleManager.Instance.OnUnitCountsChanged -= UpdateOngoingUnitCounts;
                BattleManager.Instance.OnBattleStateChanged -= HandleBattleStateChanged;
                BattleManager.Instance.OnWaveChanged -= UpdateWaveDisplay;
            }
        }

        private void UpdateOngoingUnitCounts(int playerAlive, int enemyAlive)
        {
            if (playerUnitsCountText != null)
            {
                int totalPlayer = BattleManager.Instance != null ? BattleManager.Instance.PlayerTotalCount : playerAlive;
                playerUnitsCountText.text = $"Player Army: {playerAlive} / {totalPlayer}";
            }

            if (enemyUnitsCountText != null)
            {
                int totalEnemy = BattleManager.Instance != null ? BattleManager.Instance.EnemyTotalCount : enemyAlive;
                enemyUnitsCountText.text = $"Enemy Force: {enemyAlive} / {totalEnemy}";
            }

            UpdateStartButtonState();
        }

        private void UpdateWaveDisplay(int wave)
        {
            if (waveTitleText != null)
            {
                waveTitleText.text = $"Battle Round: {wave}";
            }
        }

        private void HandleBattleStateChanged(BattleState state)
        {
            if (battleStatusText != null)
            {
                switch (state)
                {
                    case BattleState.Preparation:
                        battleStatusText.text = "PHASE: RECRUITMENT & PREPARATION";
                        battleStatusText.color = new Color(0.3f, 0.8f, 1f);
                        break;
                    case BattleState.BattleInProgress:
                        battleStatusText.text = "PHASE: BATTLE IN PROGRESS";
                        battleStatusText.color = new Color(1f, 0.4f, 0.2f);
                        break;
                    case BattleState.Victory:
                        battleStatusText.text = "VICTORY ACHIEVED!";
                        battleStatusText.color = new Color(0.3f, 1f, 0.4f);
                        break;
                    case BattleState.Defeat:
                        battleStatusText.text = "DEFEAT!";
                        battleStatusText.color = new Color(1f, 0.2f, 0.2f);
                        break;
                }
            }

            UpdateStartButtonState();
        }

        private void UpdateStartButtonState()
        {
            if (startBattleButton == null || BattleManager.Instance == null) return;

            bool isPrep = BattleManager.Instance.CurrentBattleState == BattleState.Preparation;
            bool hasUnits = BattleManager.Instance.PlayerTotalCount > 0;

            startBattleButton.interactable = isPrep && hasUnits;
        }

        private void OnStartBattleClicked()
        {
            if (BattleManager.Instance != null)
            {
                BattleManager.Instance.StartBattle();
            }
        }

        private void SetGameSpeed(float speed)
        {
            if (BattleManager.Instance != null)
            {
                BattleManager.Instance.SetGameSpeed(speed);
            }
        }
    }
}