/**
 * CHATBOT IA - Client JavaScript
 */

class ChatbotIA {
    constructor(tentativeId) {
        this.tentativeId = tentativeId;
        this.currentQuestionId = null;
        this.helpRemaining = 3;
        this.isLoading = false;
        
        this.initElements();
        this.attachEvents();
    }
    
    initElements() {
        this.btnOpenChat = document.getElementById('btn-open-chat');
        this.modalChat = document.getElementById('modal-chat');
        this.btnCloseChat = document.getElementById('btn-close-chat');
        this.chatMessages = document.getElementById('chat-messages');
        this.chatInput = document.getElementById('chat-input');
        this.btnSend = document.getElementById('btn-send');
        this.helpRemainingSpan = document.getElementById('help-remaining');
    }
    
    attachEvents() {
        // Ouvrir chat
        this.btnOpenChat?.addEventListener('click', () => this.ouvrirChat());
        
        // Fermer chat
        this.btnCloseChat?.addEventListener('click', () => this.fermerChat());
        
        // Clic en dehors du modal
        this.modalChat?.addEventListener('click', (e) => {
            if (e.target === this.modalChat) this.fermerChat();
        });
        
        // Envoyer message
        this.btnSend?.addEventListener('click', () => this.envoyerMessage());
        
        // Enter pour envoyer (Shift+Enter pour nouvelle ligne)
        this.chatInput?.addEventListener('keypress', (e) => {
            if (e.key === 'Enter' && !e.shiftKey) {
                e.preventDefault();
                this.envoyerMessage();
            }
        });
    }
    
    ouvrirChat() {
        // Récupérer l'ID de la question actuelle
        this.currentQuestionId = this.getCurrentQuestionId();
        
        if (!this.currentQuestionId) {
            alert('Erreur : impossible de déterminer la question actuelle');
            return;
        }
        
        this.modalChat.classList.add('show');
        this.chatInput.focus();
    }
    
    fermerChat() {
        this.modalChat.classList.remove('show');
    }
    
    getCurrentQuestionId() {
        // À adapter selon ton code de passer_evaluation.php
        // Option 1 : Variable globale JS
        if (typeof currentQuestionId !== 'undefined') {
            return currentQuestionId;
        }
        
        // Option 2 : Data attribute
        const questionElement = document.querySelector('[data-question-id]');
        if (questionElement) {
            return questionElement.dataset.questionId;
        }
        
        // Option 3 : Input hidden
        const hiddenInput = document.querySelector('input[name="id_question"]');
        if (hiddenInput) {
            return hiddenInput.value;
        }
        
        return null;
    }
    
    async envoyerMessage() {
        const message = this.chatInput.value.trim();
        
        if (!message || this.isLoading) return;
        
        // Afficher message utilisateur
        this.ajouterMessage(message, 'user');
        this.chatInput.value = '';
        
        // Loading
        this.isLoading = true;
        this.btnSend.disabled = true;
        this.afficherTypingIndicator();
        
        try {
            const response = await fetch('/mathematiques/api/chatbot.php', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded'
                },
                body: new URLSearchParams({
                    id_tentative: this.tentativeId,
                    id_question: this.currentQuestionId,
                    message: message
                })
            });
            
            const data = await response.json();
            
            // Retirer typing indicator
            this.retirerTypingIndicator();
            
            if (data.error) {
                this.ajouterMessage(data.message || data.error, 'system');
                
                if (data.remaining === 0) {
                    this.helpRemaining = 0;
                    this.updateHelpBadge();
                    setTimeout(() => this.fermerChat(), 3000);
                }
            } else {
                this.ajouterMessage(data.response, 'assistant');
                this.helpRemaining = data.remaining;
                this.updateHelpBadge();
                
                if (this.helpRemaining === 0) {
                    setTimeout(() => {
                        this.ajouterMessage(
                            'Tu as utilisé toute ton aide pour cette question (3/3). Continue, tu peux le faire ! 💪',
                            'system'
                        );
                        setTimeout(() => this.fermerChat(), 3000);
                    }, 500);
                }
            }
        } catch (error) {
            console.error('Erreur chatbot:', error);
            this.retirerTypingIndicator();
            this.ajouterMessage('❌ Erreur de connexion au serveur.', 'system');
        } finally {
            this.isLoading = false;
            this.btnSend.disabled = false;
            this.chatInput.focus();
        }
    }
    
    ajouterMessage(texte, type) {
        const msgDiv = document.createElement('div');
        msgDiv.className = `message message-${type}`;
        msgDiv.textContent = texte;
        this.chatMessages.appendChild(msgDiv);
        this.scrollToBottom();
    }
    
    afficherTypingIndicator() {
        const typingDiv = document.createElement('div');
        typingDiv.className = 'typing-indicator';
        typingDiv.id = 'typing-indicator';
        typingDiv.innerHTML = `
            <span class="typing-dot"></span>
            <span class="typing-dot"></span>
            <span class="typing-dot"></span>
        `;
        this.chatMessages.appendChild(typingDiv);
        this.scrollToBottom();
    }
    
    retirerTypingIndicator() {
        document.getElementById('typing-indicator')?.remove();
    }
    
    scrollToBottom() {
        this.chatMessages.scrollTop = this.chatMessages.scrollHeight;
    }
    
    updateHelpBadge() {
        if (this.helpRemainingSpan) {
            this.helpRemainingSpan.textContent = this.helpRemaining;
        }
    }
}

// Initialisation automatique si tentativeId existe
document.addEventListener('DOMContentLoaded', () => {
    // À adapter : récupérer tentativeId de ton code
    const tentativeId = document.querySelector('[data-tentative-id]')?.dataset.tentativeId;
    
    if (tentativeId) {
        window.chatbot = new ChatbotIA(tentativeId);
    }
});