using UnityEngine;
using System.Collections.Generic;

public class BattleManager : MonoBehaviour
{
    [Header("Battle Configuration")]
    public bool battleStarted = false;
    public float battleDuration = 300f; // 5 minutes max
    public Transform playerSpawnArea;
    public Transform enemySpawnArea;
    
    [Header("Unit Management")]
    public List<UnitController> playerUnits = new List<UnitController>();
    public List<UnitController> enemyUnits = new List<UnitController>();
    
    [Header("Strategy Presets")]
    public BattleStrategy defaultPlayerStrategy;
    public BattleStrategy defaultEnemyStrategy;
    
    // Battle statistics
    public int playerUnitsRemaining;
    public int enemyUnitsRemaining;
    public float battleTimer;
    
    // Events
    public System.Action<Team> OnBattleEnd;
    public System.Action OnBattleStart;
    
    private void Start()
    {
        InitializeBattle();
    }
    
    private void Update()
    {
        if (battleStarted)
        {
            battleTimer += Time.deltaTime;
            
            // Check win conditions
            CheckBattleEnd();
            
            // Auto-end battle after max duration
            if (battleTimer >= battleDuration)
            {
                EndBattle(GetWinningTeam());
            }
        }
    }
    
    private void InitializeBattle()
    {
        // Find all units in the scene
        UnitController[] allUnits = FindObjectsByType<UnitController>(FindObjectsSortMode.None);
        Debug.Log($"Found {allUnits.Length} units in the scene during initialization.");
        
        foreach (UnitController unit in allUnits)
        {
            Debug.Log($"Processing unit: {unit.gameObject.name}, Team: {unit.team}");
            
            if (unit.team == Team.Player)
            {
                playerUnits.Add(unit);
                unit.OnUnitDeath += OnPlayerUnitDeath;
                Debug.Log($"Added {unit.gameObject.name} to player units");
            }
            else if (unit.team == Team.Enemy)
            {
                enemyUnits.Add(unit);
                unit.OnUnitDeath += OnEnemyUnitDeath;
                Debug.Log($"Added {unit.gameObject.name} to enemy units");
            }
            else
            {
                Debug.LogWarning($"Unit {unit.gameObject.name} has team set to {unit.team} - not Player or Enemy!");
            }
        }
        
        playerUnitsRemaining = playerUnits.Count;
        enemyUnitsRemaining = enemyUnits.Count;
        
        Debug.Log($"Initialization complete: {playerUnitsRemaining} player units, {enemyUnitsRemaining} enemy units");
        
        // Set default strategies if none assigned
        if (defaultPlayerStrategy == null)
        {
            defaultPlayerStrategy = BattleStrategy.CreateHoldPositionStrategy();
            Debug.Log("Created default player strategy: Hold Position");
        }
        if (defaultEnemyStrategy == null)
        {
            defaultEnemyStrategy = BattleStrategy.CreateChargeStrategy();
            Debug.Log("Created default enemy strategy: Charge");
        }
    }
    
    public void StartBattle()
    {
        if (battleStarted) 
        {
            Debug.Log("Battle already started!");
            return;
        }
        
        Debug.Log($"Starting battle with {playerUnits.Count} player units and {enemyUnits.Count} enemy units.");
        
        battleStarted = true;
        battleTimer = 0f;
        
        // Apply strategies to units
        ApplyStrategiesToUnits();
        
        OnBattleStart?.Invoke();
        
        Debug.Log("Battle Started! Player units: " + playerUnitsRemaining + ", Enemy units: " + enemyUnitsRemaining);
    }
    
    private void ApplyStrategiesToUnits()
    {
        Debug.Log($"Applying strategies to units. Default player strategy: {(defaultPlayerStrategy != null ? defaultPlayerStrategy.strategyName : "NULL")}, Default enemy strategy: {(defaultEnemyStrategy != null ? defaultEnemyStrategy.strategyName : "NULL")}");
        
        // Apply strategies to player units
        foreach (UnitController unit in playerUnits)
        {
            if (unit.assignedStrategy == null)
            {
                unit.SetStrategy(defaultPlayerStrategy);
                Debug.Log($"Applied default player strategy to {unit.gameObject.name}");
            }
            else
            {
                Debug.Log($"Unit {unit.gameObject.name} already has strategy: {unit.assignedStrategy.strategyName}");
            }
        }
        
        // Apply strategies to enemy units
        foreach (UnitController unit in enemyUnits)
        {
            if (unit.assignedStrategy == null)
            {
                unit.SetStrategy(defaultEnemyStrategy);
                Debug.Log($"Applied default enemy strategy to {unit.gameObject.name}");
            }
            else
            {
                Debug.Log($"Unit {unit.gameObject.name} already has strategy: {unit.assignedStrategy.strategyName}");
            }
        }
    }
    
    public void SetPlayerStrategy(BattleStrategy strategy)
    {
        defaultPlayerStrategy = strategy;
        
        // Apply to existing units
        foreach (UnitController unit in playerUnits)
        {
            if (unit != null && unit.gameObject.activeInHierarchy)
            {
                unit.SetStrategy(strategy);
            }
        }
    }
    
    public void SetEnemyStrategy(BattleStrategy strategy)
    {
        defaultEnemyStrategy = strategy;
        
        // Apply to existing units
        foreach (UnitController unit in enemyUnits)
        {
            if (unit != null && unit.gameObject.activeInHierarchy)
            {
                unit.SetStrategy(strategy);
            }
        }
    }
    
    public void SetUnitTypeStrategy(UnitType unitType, BattleStrategy strategy, Team team)
    {
        List<UnitController> targetUnits = (team == Team.Player) ? playerUnits : enemyUnits;
        
        foreach (UnitController unit in targetUnits)
        {
            if (unit != null && unit.unitData != null && unit.unitData.unitType == unitType)
            {
                unit.SetStrategy(strategy);
            }
        }
    }
    
    /// <summary>
    /// Register a newly spawned unit with the BattleManager
    /// </summary>
    public void RegisterUnit(UnitController unit)
    {
        if (unit == null)
        {
            Debug.LogError("Cannot register null unit!");
            return;
        }
        
        Debug.Log($"Registering unit: {unit.gameObject.name}, Team: {unit.team}");
        
        if (unit.team == Team.Player)
        {
            if (!playerUnits.Contains(unit))
            {
                playerUnits.Add(unit);
                unit.OnUnitDeath += OnPlayerUnitDeath;
                playerUnitsRemaining++;
                
                // Apply current strategy if battle is active
                if (battleStarted && defaultPlayerStrategy != null)
                {
                    unit.SetStrategy(defaultPlayerStrategy);
                }
                
                Debug.Log($"Registered {unit.gameObject.name} to player units. Total: {playerUnits.Count}");
            }
        }
        else if (unit.team == Team.Enemy)
        {
            if (!enemyUnits.Contains(unit))
            {
                enemyUnits.Add(unit);
                unit.OnUnitDeath += OnEnemyUnitDeath;
                enemyUnitsRemaining++;
                
                // Apply current strategy if battle is active
                if (battleStarted && defaultEnemyStrategy != null)
                {
                    unit.SetStrategy(defaultEnemyStrategy);
                }
                
                Debug.Log($"Registered {unit.gameObject.name} to enemy units. Total: {enemyUnits.Count}");
            }
        }
        else
        {
            Debug.LogWarning($"Unit {unit.gameObject.name} has team set to {unit.team} - not Player or Enemy!");
        }
    }
    
    private void OnPlayerUnitDeath(UnitController unit)
    {
        playerUnitsRemaining--;
        Debug.Log("Player unit died. Remaining: " + playerUnitsRemaining);
    }
    
    private void OnEnemyUnitDeath(UnitController unit)
    {
        enemyUnitsRemaining--;
        Debug.Log("Enemy unit died. Remaining: " + enemyUnitsRemaining);
    }
    
    private void CheckBattleEnd()
    {
        if (playerUnitsRemaining <= 0)
        {
            EndBattle(Team.Enemy);
        }
        else if (enemyUnitsRemaining <= 0)
        {
            EndBattle(Team.Player);
        }
    }
    
    private Team GetWinningTeam()
    {
        if (playerUnitsRemaining > enemyUnitsRemaining)
            return Team.Player;
        else if (enemyUnitsRemaining > playerUnitsRemaining)
            return Team.Enemy;
        else
            return Team.Player; // Draw goes to player
    }
    
    private void EndBattle(Team winner)
    {
        if (!battleStarted) return;
        
        battleStarted = false;
        OnBattleEnd?.Invoke(winner);
        
        Debug.Log("Battle Ended! Winner: " + winner);
        Debug.Log("Final Scores - Player: " + playerUnitsRemaining + ", Enemy: " + enemyUnitsRemaining);
    }
    
    public void ResetBattle()
    {
        battleStarted = false;
        battleTimer = 0f;
        
        // Reset all units
        foreach (UnitController unit in playerUnits)
        {
            if (unit != null)
            {
                unit.gameObject.SetActive(true);
                unit.currentHealth = unit.unitData.health;
                unit.currentState = UnitState.Idle;
            }
        }
        
        foreach (UnitController unit in enemyUnits)
        {
            if (unit != null)
            {
                unit.gameObject.SetActive(true);
                unit.currentHealth = unit.unitData.health;
                unit.currentState = UnitState.Idle;
            }
        }
        
        playerUnitsRemaining = playerUnits.Count;
        enemyUnitsRemaining = enemyUnits.Count;
    }
    
    // Helper methods for UI
    public List<BattleStrategy> GetPresetStrategies()
    {
        return new List<BattleStrategy>
        {
            BattleStrategy.CreateHoldPositionStrategy(),
            BattleStrategy.CreateFlankStrategy(),
            BattleStrategy.CreateChargeStrategy(),
            BattleStrategy.CreateSpreadWideStrategy(),
            BattleStrategy.CreateWaitForCloseStrategy()
        };
    }
    
    public void AssignStrategyByText(string strategyText, Team team)
    {
        BattleStrategy strategy = ParseStrategyFromText(strategyText);
        
        if (team == Team.Player)
            SetPlayerStrategy(strategy);
        else
            SetEnemyStrategy(strategy);
    }
    
    private BattleStrategy ParseStrategyFromText(string text)
    {
        // Simple text parsing for strategy assignment
        text = text.ToLower();
        
        if (text.Contains("flank") || text.Contains("around"))
            return BattleStrategy.CreateFlankStrategy();
        else if (text.Contains("charge") || text.Contains("attack"))
            return BattleStrategy.CreateChargeStrategy();
        else if (text.Contains("spread") || text.Contains("wide"))
            return BattleStrategy.CreateSpreadWideStrategy();
        else if (text.Contains("wait") || text.Contains("close"))
            return BattleStrategy.CreateWaitForCloseStrategy();
        else
            return BattleStrategy.CreateHoldPositionStrategy();
    }
}