using System.Collections;
using Core;
using UnityEngine;
using UnityEngine.UI;
using AppleHills.Core.Settings;

namespace UI.CardSystem
{
    /// <summary>
    /// Controls a vertical progress bar made of individual Image elements.
    /// Fills from bottom to top and animates the newest element with a blink effect.
    /// 
    /// Setup: Place on GameObject with VerticalLayoutGroup (Reverse Arrangement enabled).
    /// First child = first progress element (1/5), last child = last progress element (5/5).
    /// </summary>
    public class ProgressBarController : MonoBehaviour
    {
        [Header("Progress Elements")]
        [Tooltip("The individual Image components representing progress segments (auto-detected from children)")]
        private Image[] _progressElements;
        
        private ICardSystemSettings _settings;
        private Coroutine _currentBlinkCoroutine;
        
        private void Awake()
        {
            _settings = GameManager.GetSettingsObject<ICardSystemSettings>();
            
            // Auto-detect all child Image components
            _progressElements = GetComponentsInChildren<Image>(true);
            
            if (_progressElements.Length == 0)
            {
                Logging.Warning("[ProgressBarController] No child Image components found! Add Image children to this GridLayout.");
            }
        }
        
        /// <summary>
        /// Show progress and animate the newest element with a blink effect.
        /// </summary>
        /// <param name="currentCount">Current progress (1 to maxCount)</param>
        /// <param name="maxCount">Maximum progress value (typically 5)</param>
        /// <param name="onComplete">Callback invoked after blink animation completes</param>
        public void ShowProgress(int currentCount, int maxCount, System.Action onComplete)
        {
            // Validate input
            if (currentCount < 0 || currentCount > maxCount)
            {
                Logging.Warning($"[ProgressBarController] Invalid progress: {currentCount}/{maxCount}");
                onComplete?.Invoke();
                return;
            }
            
            // Validate element count
            if (_progressElements.Length < maxCount)
            {
                Logging.Warning($"[ProgressBarController] Not enough progress elements! Expected {maxCount}, found {_progressElements.Length}");
                onComplete?.Invoke();
                return;
            }
            
            // Stop any existing blink animation
            if (_currentBlinkCoroutine != null)
            {
                StopCoroutine(_currentBlinkCoroutine);
                _currentBlinkCoroutine = null;
            }
            
            // Disable all elements first
            foreach (var element in _progressElements)
            {
                element.enabled = false;
            }
            
            // Enable first N elements (since first child = 1/5, last child = 5/5)
            // If currentCount = 3, enable elements [0], [1], [2] (first 3 elements)
            for (int i = 0; i < currentCount && i < _progressElements.Length; i++)
            {
                _progressElements[i].enabled = true;
            }
            
            Logging.Debug($"[ProgressBarController] Showing progress {currentCount}/{maxCount}");
            
            // Blink the NEWEST element (the last one we just enabled)
            // Newest element is at index (currentCount - 1)
            int newestIndex = currentCount - 1;
            if (newestIndex >= 0 && newestIndex < _progressElements.Length && currentCount > 0)
            {
                _currentBlinkCoroutine = StartCoroutine(BlinkElement(newestIndex, onComplete));
            }
            else
            {
                // No element to blink (e.g., currentCount = 0)
                onComplete?.Invoke();
            }
        }
        
        /// <summary>
        /// Show progress without blink animation (instant display).
        /// </summary>
        /// <param name="currentCount">Current progress (1 to maxCount)</param>
        /// <param name="maxCount">Maximum progress value</param>
        public void ShowProgressInstant(int currentCount, int maxCount)
        {
            // Validate
            if (currentCount < 0 || currentCount > maxCount || _progressElements.Length < maxCount)
            {
                return;
            }
            
            // Disable all
            foreach (var element in _progressElements)
            {
                element.enabled = false;
            }
            
            // Enable first N elements
            for (int i = 0; i < currentCount && i < _progressElements.Length; i++)
            {
                _progressElements[i].enabled = true;
            }
        }
        
        /// <summary>
        /// Hide all progress elements.
        /// </summary>
        public void HideProgress()
        {
            foreach (var element in _progressElements)
            {
                element.enabled = false;
            }
        }
        
        /// <summary>
        /// Blink a specific element by toggling enabled/disabled.
        /// </summary>
        private IEnumerator BlinkElement(int index, System.Action onComplete)
        {
            if (index < 0 || index >= _progressElements.Length)
            {
                onComplete?.Invoke();
                yield break;
            }
            
            Image element = _progressElements[index];
            
            // Get blink settings (or use defaults if not available)
            float blinkDuration = 0.15f; // Duration for each on/off toggle
            int blinkCount = 3; // Number of full blinks (on->off->on = 1 blink)
            
            // Try to get settings if available
            if (_settings != null)
            {
                // Settings could expose these if needed:
                // blinkDuration = _settings.ProgressBlinkDuration;
                // blinkCount = _settings.ProgressBlinkCount;
            }
            
            Logging.Debug($"[ProgressBarController] Blinking element {index} ({blinkCount} times)");
            
            // Wait a brief moment before starting blink
            yield return new WaitForSeconds(0.3f);
            
            // Perform blinks (on->off->on = 1 full blink)
            for (int i = 0; i < blinkCount; i++)
            {
                // Off
                element.enabled = false;
                yield return new WaitForSeconds(blinkDuration);
                
                // On
                element.enabled = true;
                yield return new WaitForSeconds(blinkDuration);
            }
            
            // Ensure element is enabled at the end
            element.enabled = true;
            
            Logging.Debug($"[ProgressBarController] Blink complete for element {index}");
            
            _currentBlinkCoroutine = null;
            onComplete?.Invoke();
        }
        
        /// <summary>
        /// Get the total number of progress elements available.
        /// </summary>
        public int GetElementCount()
        {
            return _progressElements?.Length ?? 0;
        }
        
        private void OnDestroy()
        {
            // Clean up any running coroutines
            if (_currentBlinkCoroutine != null)
            {
                StopCoroutine(_currentBlinkCoroutine);
                _currentBlinkCoroutine = null;
            }
        }
    }
}