/**
 * MODAL MANAGER - Système de modales unifié
 * Fait partie du design system Notytex
 */

class ModalManager {
    constructor(core, config = {}) {
        this.core = core;
        this.config = {
            backdrop: true,
            keyboard: true,
            focus: true,
            ...config
        };
        
        this.activeModals = new Set();
        this.modalStack = [];
    }

    init() {
        this.core.components.set('modals', this);
        this.setupEventListeners();
        
        // Auto-détecter les modales existantes
        this.core.utils.queryAll('.modal').forEach(modal => {
            this.registerModal(modal);
        });
    }

    /**
     * Configuration des événements
     */
    setupEventListeners() {
        // Gestion du clavier
        if (this.config.keyboard) {
            document.addEventListener('keydown', this.handleKeydown.bind(this));
        }

        // Gestion des clics sur backdrop
        document.addEventListener('click', this.handleBackdropClick.bind(this));

        // Détection automatique des triggers
        document.addEventListener('click', this.handleTriggerClick.bind(this));
    }

    /**
     * Enregistrer une modale existante
     */
    registerModal(modalElement) {
        const modalId = modalElement.id;
        if (!modalId) {
            console.warn('Modal sans ID détectée, ignorée');
            return;
        }

        // Marquer comme gérée par le système
        modalElement.setAttribute('data-modal-managed', 'true');
        
        // Configuration ARIA
        modalElement.setAttribute('role', 'dialog');
        modalElement.setAttribute('aria-modal', 'true');
        modalElement.setAttribute('aria-hidden', 'true');
        
        return modalId;
    }

    /**
     * Créer une modale programmatiquement
     */
    create(options = {}) {
        const modalId = options.id || `modal-${Date.now()}`;
        
        const modal = this.core.utils.createElement('div', {
            id: modalId,
            className: 'modal fixed inset-0 bg-gray-600 bg-opacity-50 hidden z-50',
            role: 'dialog',
            'aria-modal': 'true',
            'aria-hidden': 'true',
            'aria-labelledby': options.titleId || `${modalId}-title`
        });

        const modalDialog = this.core.utils.createElement('div', {
            className: 'flex items-center justify-center min-h-screen p-4'
        });

        const modalContent = this.core.utils.createElement('div', {
            className: `modal-content bg-white rounded-xl shadow-xl transform transition-all duration-300 scale-95 ${options.size === 'large' ? 'max-w-4xl' : options.size === 'small' ? 'max-w-md' : 'max-w-2xl'} w-full`
        });

        // Header si fourni
        if (options.title || options.header) {
            const header = this.core.utils.createElement('div', {
                className: 'modal-header px-6 py-4 border-b border-gray-200 flex items-center justify-between'
            });

            const title = this.core.utils.createElement('h3', {
                id: options.titleId || `${modalId}-title`,
                className: 'text-lg font-semibold text-gray-900'
            });
            
            if (options.title) {
                title.textContent = options.title;
            } else if (options.header) {
                title.innerHTML = options.header;
            }

            const closeButton = this.core.utils.createElement('button', {
                className: 'text-gray-400 hover:text-gray-600 transition-colors',
                onclick: () => this.close(modalId)
            });

            closeButton.innerHTML = `
                <svg class="w-6 h-6" fill="currentColor" viewBox="0 0 20 20">
                    <path fill-rule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clip-rule="evenodd"/>
                </svg>
            `;

            header.appendChild(title);
            header.appendChild(closeButton);
            modalContent.appendChild(header);
        }

        // Body
        const body = this.core.utils.createElement('div', {
            className: 'modal-body p-6'
        });

        if (options.content) {
            if (typeof options.content === 'string') {
                body.innerHTML = options.content;
            } else {
                body.appendChild(options.content);
            }
        }

        modalContent.appendChild(body);

        // Footer si fourni
        if (options.footer || options.actions) {
            const footer = this.core.utils.createElement('div', {
                className: 'modal-footer px-6 py-4 border-t border-gray-200 flex justify-end space-x-3'
            });

            if (options.actions) {
                options.actions.forEach(action => {
                    const button = this.core.utils.createElement('button', {
                        className: `px-4 py-2 rounded-lg font-medium transition-colors ${this.getActionButtonClasses(action.type)}`,
                        onclick: action.handler
                    });
                    button.textContent = action.text;
                    footer.appendChild(button);
                });
            } else if (options.footer) {
                footer.innerHTML = options.footer;
            }

            modalContent.appendChild(footer);
        }

        modalDialog.appendChild(modalContent);
        modal.appendChild(modalDialog);
        document.body.appendChild(modal);

        this.registerModal(modal);
        return modalId;
    }

    /**
     * Ouvrir une modale
     */
    open(modalId, options = {}) {
        const modal = document.getElementById(modalId);
        if (!modal) {
            console.error(`Modal with ID "${modalId}" not found`);
            return false;
        }

        // Fermer autres modales si non-stackable
        if (!options.stackable && this.activeModals.size > 0) {
            this.closeAll();
        }

        // Ajouter à la pile active
        this.activeModals.add(modalId);
        this.modalStack.push(modalId);

        // Affichage
        modal.classList.remove('hidden');
        modal.classList.add('flex');
        modal.setAttribute('aria-hidden', 'false');

        // Animation d'entrée
        const content = modal.querySelector('.modal-content');
        if (content) {
            requestAnimationFrame(() => {
                content.classList.remove('scale-95');
                content.classList.add('scale-100');
            });
        }

        // Gestion du focus
        if (this.config.focus) {
            this.trapFocus(modal);
        }

        // Bloquer le scroll du body
        document.body.classList.add('overflow-hidden');

        // Émettre événement
        this.core.emit('modal:opened', { modalId, modal });

        return true;
    }

    /**
     * Fermer une modale
     */
    close(modalId) {
        const modal = document.getElementById(modalId);
        if (!modal || !this.activeModals.has(modalId)) {
            return false;
        }

        // Animation de sortie
        const content = modal.querySelector('.modal-content');
        if (content) {
            content.classList.remove('scale-100');
            content.classList.add('scale-95');
        }

        // Masquage après animation
        setTimeout(() => {
            modal.classList.add('hidden');
            modal.classList.remove('flex');
            modal.setAttribute('aria-hidden', 'true');
        }, 150);

        // Retirer de la pile active
        this.activeModals.delete(modalId);
        const stackIndex = this.modalStack.indexOf(modalId);
        if (stackIndex > -1) {
            this.modalStack.splice(stackIndex, 1);
        }

        // Restaurer le scroll si aucune modale active
        if (this.activeModals.size === 0) {
            document.body.classList.remove('overflow-hidden');
        }

        // Émettre événement
        this.core.emit('modal:closed', { modalId, modal });

        return true;
    }

    /**
     * Fermer toutes les modales
     */
    closeAll() {
        Array.from(this.activeModals).forEach(modalId => {
            this.close(modalId);
        });
    }

    /**
     * Piégeage du focus dans la modale
     */
    trapFocus(modal) {
        const focusableElements = modal.querySelectorAll(
            'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
        );
        
        const firstElement = focusableElements[0];
        const lastElement = focusableElements[focusableElements.length - 1];

        // Focus initial
        if (firstElement) {
            firstElement.focus();
        }

        // Gestionnaire de tabulation
        const handleTab = (event) => {
            if (event.key !== 'Tab') return;

            if (event.shiftKey) {
                // Shift + Tab
                if (document.activeElement === firstElement) {
                    event.preventDefault();
                    lastElement.focus();
                }
            } else {
                // Tab
                if (document.activeElement === lastElement) {
                    event.preventDefault();
                    firstElement.focus();
                }
            }
        };

        modal.addEventListener('keydown', handleTab);
        
        // Nettoyer à la fermeture
        const cleanup = () => {
            modal.removeEventListener('keydown', handleTab);
            this.core.off('modal:closed', cleanup);
        };
        this.core.on('modal:closed', cleanup);
    }

    /**
     * Gestionnaire de clics sur backdrop
     */
    handleBackdropClick(event) {
        if (!this.config.backdrop) return;

        const modal = event.target.closest('.modal');
        if (!modal || !this.activeModals.has(modal.id)) return;

        // Vérifier si le clic est sur le backdrop (pas le contenu)
        if (event.target === modal || event.target.classList.contains('modal-backdrop')) {
            this.close(modal.id);
        }
    }

    /**
     * Gestionnaire de touches clavier
     */
    handleKeydown(event) {
        if (event.key === 'Escape' && this.modalStack.length > 0) {
            const topModalId = this.modalStack[this.modalStack.length - 1];
            this.close(topModalId);
        }
    }

    /**
     * Gestionnaire de clics sur triggers
     */
    handleTriggerClick(event) {
        const trigger = event.target.closest('[data-modal-target]');
        if (!trigger) return;

        event.preventDefault();
        const targetId = trigger.getAttribute('data-modal-target');
        const options = {
            stackable: trigger.hasAttribute('data-modal-stackable')
        };

        this.open(targetId, options);
    }

    /**
     * Classes CSS pour les boutons d'action
     */
    getActionButtonClasses(type) {
        const classes = {
            primary: 'bg-blue-600 text-white hover:bg-blue-700',
            secondary: 'bg-gray-200 text-gray-800 hover:bg-gray-300',
            success: 'bg-green-600 text-white hover:bg-green-700',
            danger: 'bg-red-600 text-white hover:bg-red-700',
            warning: 'bg-orange-600 text-white hover:bg-orange-700'
        };

        return classes[type] || classes.secondary;
    }

    /**
     * Utilitaires publics
     */
    isOpen(modalId) {
        return this.activeModals.has(modalId);
    }

    getActiveModals() {
        return Array.from(this.activeModals);
    }

    hasActiveModals() {
        return this.activeModals.size > 0;
    }
}

export default ModalManager;