using UnityEngine;
using System;

/// <summary>
/// Quest state enumeration
/// </summary>
public enum QuestState
{
    NotStarted,
    Active,
    Completed,
    Failed
}

/// <summary>
/// Defines a quest with objectives and state tracking
/// </summary>
[Serializable]
public class Quest
{
    [Header("Quest Info")]
    public string questId;
    public string questName;
    [TextArea(3, 10)]
    public string description;
    
    [Header("Quest Details")]
    public int experienceReward = 100;
    public int goldReward = 50;
    [Tooltip("Items awarded upon completion (optional)")]
    public string[] itemRewards;
    
    [Header("Quest Progress")]
    public QuestState state = QuestState.NotStarted;
    public int currentProgress = 0;
    public int requiredProgress = 1; // How many steps/kills/items needed
    
    [Header("Quest Flow")]
    [Tooltip("Quest that must be completed before this one unlocks")]
    public string prerequisiteQuestId;
    [Tooltip("NPC who gives this quest")]
    public string questGiverId;
    [Tooltip("NPC who completes/turns in this quest (leave empty to use quest giver)")]
    public string questCompleterId;

    /// <summary>
    /// Check if quest can be started
    /// </summary>
    public bool CanStart()
    {
        return state == QuestState.NotStarted;
    }

    /// <summary>
    /// Check if quest is active
    /// </summary>
    public bool IsActive()
    {
        return state == QuestState.Active;
    }

    /// <summary>
    /// Check if quest objectives are met
    /// </summary>
    public bool IsComplete()
    {
        return IsActive() && currentProgress >= requiredProgress;
    }

    /// <summary>
    /// Advance quest progress by amount
    /// </summary>
    public void AddProgress(int amount = 1)
    {
        if (IsActive())
        {
            currentProgress += amount;
            currentProgress = Mathf.Min(currentProgress, requiredProgress);
        }
    }

    /// <summary>
    /// Get progress as percentage
    /// </summary>
    public float GetProgressPercent()
    {
        if (requiredProgress <= 0) return 0f;
        return Mathf.Clamp01((float)currentProgress / requiredProgress);
    }

    /// <summary>
    /// Reset quest progress
    /// </summary>
    public void Reset()
    {
        state = QuestState.NotStarted;
        currentProgress = 0;
    }
}