using System;
using System.Collections;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace Dialogue
{
    /// <summary>
    /// Display mode for the speech bubble text
    /// </summary>
    public enum TextDisplayMode
    {
        Instant,    // Display all text at once
        Typewriter  // Display text one character at a time
    }

    [AddComponentMenu("AppleHills/Dialogue/Speech Bubble")]
    public class SpeechBubble : MonoBehaviour
    {
        [SerializeField] private TextMeshProUGUI textDisplay;
        [SerializeField] private Image imageDisplay; // New field for displaying images
        [SerializeField] private TextDisplayMode displayMode = TextDisplayMode.Typewriter;
        [SerializeField] private float typewriterSpeed = 0.05f; // Time between characters in seconds
        [SerializeField] private AudioSource typingSoundSource;
        [SerializeField] private float typingSoundFrequency = 3; // Play sound every X characters
        [SerializeField] private bool useRichText = true; // Whether to respect rich text tags
        [SerializeField] private float dialogueDisplayTime = 1.5f; // Time in seconds to display dialogue before showing prompt
        [SerializeField] private string dialoguePromptText = ". . ."; // Text to show as a prompt for available dialogue

        private Coroutine typewriterCoroutine;
        private Coroutine promptUpdateCoroutine;
        private string currentFullText = string.Empty;
        private Sprite currentImage = null;
        private bool isVisible = false;
        private DialogueContentType currentContentType = DialogueContentType.Text;

        private void Awake()
        {
            // Ensure we have both components
            if (textDisplay == null)
                Debug.LogError("SpeechBubble: TextMeshProUGUI component is not assigned!");
                
            if (imageDisplay == null)
                Debug.LogError("SpeechBubble: Image component is not assigned!");
        }

        /// <summary>
        /// Show the speech bubble
        /// </summary>
        public void Show()
        {
            gameObject.SetActive(true);
            isVisible = true;
        }

        /// <summary>
        /// Hide the speech bubble
        /// </summary>
        public void Hide()
        {
            gameObject.SetActive(false);
            isVisible = false;
            
            // Stop any ongoing typewriter effect
            if (typewriterCoroutine != null)
            {
                StopCoroutine(typewriterCoroutine);
                typewriterCoroutine = null;
            }
            
            // Stop any prompt update coroutine
            if (promptUpdateCoroutine != null)
            {
                StopCoroutine(promptUpdateCoroutine);
                promptUpdateCoroutine = null;
            }
        }

        /// <summary>
        /// Toggle visibility of the speech bubble
        /// </summary>
        public void Toggle()
        {
            if (isVisible)
                Hide();
            else
                Show();
        }

        /// <summary>
        /// Set the text to display in the speech bubble
        /// </summary>
        /// <param name="text">Text to display</param>
        public void SetText(string text)
        {
            if (textDisplay == null)
            {
                Debug.LogError("SpeechBubble: TextMeshProUGUI component is not assigned!");
                return;
            }

            currentFullText = text;
            currentContentType = DialogueContentType.Text;

            // Stop any existing typewriter effect
            if (typewriterCoroutine != null)
            {
                StopCoroutine(typewriterCoroutine);
                typewriterCoroutine = null;
            }

            // Activate text display, deactivate image display
            textDisplay.gameObject.SetActive(true);
            if (imageDisplay != null)
            {
                imageDisplay.gameObject.SetActive(false);
            }

            // Display text based on the selected mode
            if (displayMode == TextDisplayMode.Instant)
            {
                textDisplay.text = text;
            }
            else // Typewriter mode
            {
                textDisplay.text = string.Empty; // Clear the text initially
                typewriterCoroutine = StartCoroutine(TypewriterEffect(text));
            }

            // Make sure the bubble is visible when setting text
            if (!isVisible)
                Show();
        }
        
        /// <summary>
        /// Display a dialogue line and handle prompt visibility afterward
        /// </summary>
        /// <param name="line">The dialogue line to display</param>
        /// <param name="hasMoreDialogue">Whether there are more dialogue lines available</param>
        public void DisplayDialogueLine(string line, bool hasMoreDialogue)
        {
            // Cancel any existing prompt update
            if (promptUpdateCoroutine != null)
            {
                StopCoroutine(promptUpdateCoroutine);
                promptUpdateCoroutine = null;
            }
            
            // Display the dialogue line
            if (!string.IsNullOrEmpty(line))
            {
                SetText(line);
                
                // After a delay, update the prompt visibility
                promptUpdateCoroutine = StartCoroutine(UpdatePromptAfterDelay(hasMoreDialogue));
            }
            else
            {
                // If no line to display, update prompt visibility immediately
                UpdatePromptVisibility(hasMoreDialogue);
            }
        }
        
        /// <summary>
        /// Update the speech bubble to either show a prompt or hide based on dialogue availability
        /// </summary>
        /// <param name="hasDialogueAvailable">Whether dialogue is available</param>
        public void UpdatePromptVisibility(bool hasDialogueAvailable)
        {
            if (hasDialogueAvailable)
            {
                Show();
                SetText(dialoguePromptText);
            }
            else
            {
                Hide();
            }
        }
        
        /// <summary>
        /// Coroutine to update the prompt visibility after a delay
        /// </summary>
        private IEnumerator UpdatePromptAfterDelay(bool hasMoreDialogue)
        {
            // Wait for the configured display time
            yield return new WaitForSeconds(dialogueDisplayTime);
            
            // Update the prompt visibility
            UpdatePromptVisibility(hasMoreDialogue);
            
            promptUpdateCoroutine = null;
        }

        /// <summary>
        /// Change the display mode
        /// </summary>
        /// <param name="mode">New display mode</param>
        public void SetDisplayMode(TextDisplayMode mode)
        {
            displayMode = mode;
            
            // If we're changing modes while text is displayed, refresh it
            if (!string.IsNullOrEmpty(currentFullText))
            {
                SetText(currentFullText);
            }
        }

        /// <summary>
        /// Skip the typewriter effect and show the full text immediately
        /// </summary>
        public void SkipTypewriter()
        {
            if (typewriterCoroutine != null)
            {
                StopCoroutine(typewriterCoroutine);
                typewriterCoroutine = null;
                textDisplay.text = currentFullText;
            }
        }

        /// <summary>
        /// Set the speed of the typewriter effect
        /// </summary>
        /// <param name="charactersPerSecond">Characters per second</param>
        public void SetTypewriterSpeed(float charactersPerSecond)
        {
            if (charactersPerSecond <= 0)
            {
                Debug.LogError("SpeechBubble: Typewriter speed must be greater than 0!");
                return;
            }
            
            typewriterSpeed = 1f / charactersPerSecond;
        }

        /// <summary>
        /// Coroutine that gradually reveals text one character at a time
        /// </summary>
        private IEnumerator TypewriterEffect(string text)
        {
            int visibleCount = 0;
            int characterCount = 0;
            
            while (visibleCount < text.Length)
            {
                // Skip rich text tags if enabled
                if (useRichText && visibleCount < text.Length && text[visibleCount] == '<')
                {
                    // Find the end of the tag
                    int tagEnd = text.IndexOf('>', visibleCount);
                    if (tagEnd != -1)
                    {
                        // Include the entire tag at once
                        visibleCount = tagEnd + 1;
                        textDisplay.text = text.Substring(0, visibleCount);
                        continue;
                    }
                }
                
                // Reveal the next character
                visibleCount++;
                characterCount++;
                textDisplay.text = text.Substring(0, visibleCount);
                
                // Play typing sound at specified frequency
                if (typingSoundSource != null && characterCount % typingSoundFrequency == 0)
                {
                    typingSoundSource.Play();
                }
                
                yield return new WaitForSeconds(typewriterSpeed);
            }
            
            typewriterCoroutine = null;
        }

        /// <summary>
        /// Set the image to display in the speech bubble
        /// </summary>
        /// <param name="sprite">Sprite to display</param>
        public void SetImage(Sprite sprite)
        {
            if (imageDisplay == null)
            {
                Debug.LogError("SpeechBubble: Image component is not assigned!");
                return;
            }

            currentImage = sprite;
            currentContentType = DialogueContentType.Image;

            // Activate image display, set the sprite
            imageDisplay.gameObject.SetActive(true);
            imageDisplay.sprite = sprite;

            // Deactivate text display
            if (textDisplay != null)
            {
                textDisplay.gameObject.SetActive(false);
            }

            // Make sure the bubble is visible when setting image
            if (!isVisible)
                Show();
        }

        /// <summary>
        /// Clear the displayed image
        /// </summary>
        public void ClearImage()
        {
            SetImage(null);
        }

        /// <summary>
        /// Set the content of the speech bubble (text or image)
        /// </summary>
        /// <param name="text">Text content</param>
        /// <param name="image">Image content</param>
        public void SetContent(string text, Sprite image)
        {
            if (!string.IsNullOrEmpty(text))
            {
                currentContentType = DialogueContentType.Text;
                SetText(text);
            }
            else if (image != null)
            {
                currentContentType = DialogueContentType.Image;
                SetImage(image);
            }
        }

        /// <summary>
        /// Get the current content type of the speech bubble
        /// </summary>
        /// <returns>Current content type</returns>
        public DialogueContentType GetCurrentContentType()
        {
            return currentContentType;
        }

        /// <summary>
        /// Display dialogue content (text or image)
        /// </summary>
        /// <param name="content">The dialogue content to display</param>
        /// <param name="hasMoreDialogue">Whether there are more dialogue content items available</param>
        public void DisplayDialogueContent(DialogueContent content, bool hasMoreDialogue)
        {
            // Cancel any existing prompt update
            if (promptUpdateCoroutine != null)
            {
                StopCoroutine(promptUpdateCoroutine);
                promptUpdateCoroutine = null;
            }
            
            if (content == null)
            {
                UpdatePromptVisibility(hasMoreDialogue);
                return;
            }
            
            // Display the content based on its type
            currentContentType = content.ContentType;
            
            if (content.ContentType == DialogueContentType.Text)
            {
                // Show text display, hide image display
                textDisplay.gameObject.SetActive(true);
                if (imageDisplay != null) imageDisplay.gameObject.SetActive(false);
                
                // Display the text
                DisplayDialogueLine(content.Text, hasMoreDialogue);
            }
            else // Image content
            {
                // Hide text display, show image display
                textDisplay.gameObject.SetActive(false);
                if (imageDisplay != null) imageDisplay.gameObject.SetActive(true);
                
                // Set the image
                SetImage(content.Image);
                
                // After a delay, update the prompt visibility
                promptUpdateCoroutine = StartCoroutine(UpdatePromptAfterDelay(hasMoreDialogue));
            }
        }
    }
}