/**
 * Insertr - Element-Level Edit-in-place CMS Library
 * Modular architecture with configuration system
 */

class Insertr {
    constructor(options = {}) {
        this.options = {
            apiEndpoint: options.apiEndpoint || '/api/content',
            authEndpoint: options.authEndpoint || '/api/auth',
            autoInit: options.autoInit !== false,
            ...options
        };
        
        // Core state
        this.state = {
            isAuthenticated: false,
            editMode: false,
            currentUser: null,
            activeEditor: null
        };
        
        this.editableElements = new Map();
        this.statusIndicator = null;

        // Initialize modules
        this.config = new InsertrConfig(options.config);
        this.validation = new InsertrValidation(this.config);
        this.formRenderer = new InsertrFormRenderer(this.validation);
        this.contentManager = new InsertrContentManager(options);
        this.markdownProcessor = new InsertrMarkdownProcessor();

        if (this.options.autoInit) {
            this.init();
        }
    }

    /**
     * Initialize the CMS system
     */
    async init() {
        console.log('🚀 Insertr initializing with modular architecture...');
        
        // Scan for editable elements
        this.scanForEditableElements();
        
        // Setup authentication controls
        this.setupAuthenticationControls();
        
        // Create status indicator
        this.createStatusIndicator();
        
        // Apply initial state
        this.updateBodyClasses();
        
        console.log(`📝 Found ${this.editableElements.size} editable elements`);
    }

    /**
     * Scan for editable elements and set them up
     */
    scanForEditableElements() {
        const elements = document.querySelectorAll('.insertr');
        
        elements.forEach(element => {
            const contentId = element.getAttribute('data-content-id');
            if (!contentId) {
                console.warn('Insertr element missing data-content-id:', element);
                return;
            }
            
            this.editableElements.set(contentId, element);
            this.setupEditableElement(element, contentId);
        });
    }

    /**
     * Setup individual editable element
     * @param {HTMLElement} element - Element to setup
     * @param {string} contentId - Content identifier
     */
    setupEditableElement(element, contentId) {
        // Generate field configuration
        const fieldConfig = this.config.generateFieldConfig(element);
        element._insertrConfig = fieldConfig;
        
        // Add edit button
        this.addEditButton(element, contentId);
        
        // Load saved content if available
        const savedContent = this.contentManager.getContent(contentId);
        if (savedContent) {
            this.contentManager.applyContentToElement(element, savedContent);
        }
    }

    /**
     * Add edit button to element
     * @param {HTMLElement} element - Element to add button to
     * @param {string} contentId - Content identifier
     */
    addEditButton(element, contentId) {
        // Create edit button
        const editBtn = document.createElement('button');
        editBtn.className = 'insertr-edit-btn';
        editBtn.innerHTML = '✏️';
        editBtn.title = `Edit ${element._insertrConfig.label}`;
        editBtn.addEventListener('click', (e) => {
            e.preventDefault();
            e.stopPropagation();
            this.startEditing(contentId);
        });
        
        // Position relative for button placement
        if (getComputedStyle(element).position === 'static') {
            element.style.position = 'relative';
        }
        
        element.appendChild(editBtn);
    }

    /**
     * Start editing an element
     * @param {string} contentId - Content identifier
     */
    startEditing(contentId) {
        const element = this.editableElements.get(contentId);
        if (!element || !this.state.editMode) return;
        
        // Close any active editor
        if (this.state.activeEditor && this.state.activeEditor !== contentId) {
            this.cancelEditing(this.state.activeEditor);
        }
        
        const config = element._insertrConfig;
        const currentContent = this.contentManager.extractContentFromElement(element);
        
        // Create and show edit form
        const form = this.formRenderer.createEditForm(contentId, config, currentContent);
        const overlay = this.formRenderer.showEditForm(element, form);
        
        // Setup form event handlers
        this.setupFormHandlers(overlay, contentId);
        
        this.state.activeEditor = contentId;
    }

    /**
     * Setup form event handlers
     * @param {HTMLElement} overlay - Form overlay
     * @param {string} contentId - Content identifier
     */
    setupFormHandlers(overlay, contentId) {
        const saveBtn = overlay.querySelector('.insertr-btn-save');
        const cancelBtn = overlay.querySelector('.insertr-btn-cancel');
        
        if (saveBtn) {
            saveBtn.addEventListener('click', () => {
                this.saveElementContent(contentId, overlay);
            });
        }
        
        if (cancelBtn) {
            cancelBtn.addEventListener('click', () => {
                this.cancelEditing(contentId);
            });
        }

        // Handle Enter to save, Escape to cancel
        overlay.addEventListener('keydown', (e) => {
            if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
                e.preventDefault();
                this.saveElementContent(contentId, overlay);
            } else if (e.key === 'Escape') {
                e.preventDefault();
                this.cancelEditing(contentId);
            }
        });
    }

    /**
     * Save element content
     * @param {string} contentId - Content identifier
     * @param {HTMLElement} overlay - Form overlay
     */
    async saveElementContent(contentId, overlay) {
        const element = this.editableElements.get(contentId);
        const form = overlay.querySelector('.insertr-edit-form');
        const config = element._insertrConfig;
        
        if (!element || !form) return;
        
        // Extract form data
        const formData = this.formRenderer.extractFormData(form, config);
        
        // Validate the data
        const validation = this.validateFormData(formData, config);
        if (!validation.valid) {
            alert(validation.message);
            return;
        }
        
        try {
            // Show saving state
            element.classList.add('insertr-saving');
            
            // Save to server (mock for now)
            await this.contentManager.saveToServer(contentId, formData);
            
            // Apply content to element
            this.contentManager.applyContentToElement(element, formData);
            
            // Close form
            this.formRenderer.hideEditForm(overlay);
            this.state.activeEditor = null;
            
            // Show success feedback
            element.classList.add('insertr-save-success');
            setTimeout(() => {
                element.classList.remove('insertr-save-success');
            }, 2000);
            
        } catch (error) {
            console.error('Failed to save content:', error);
            alert('Failed to save content. Please try again.');
        } finally {
            element.classList.remove('insertr-saving');
        }
    }

    /**
     * Validate form data before saving
     * @param {string|Object} data - Form data to validate
     * @param {Object} config - Field configuration
     * @returns {Object} Validation result
     */
    validateFormData(data, config) {
        if (config.type === 'link' && config.includeUrl) {
            // Validate link data
            const textValidation = this.validation.validateInput(data.text, 'text');
            if (!textValidation.valid) return textValidation;
            
            const urlValidation = this.validation.validateInput(data.url, 'link');
            if (!urlValidation.valid) return urlValidation;
            
            return { valid: true };
        } else {
            // Validate single content
            return this.validation.validateInput(data, config.type);
        }
    }

    /**
     * Cancel editing
     * @param {string} contentId - Content identifier
     */
    cancelEditing(contentId) {
        const overlay = document.querySelector('.insertr-form-overlay');
        if (overlay) {
            this.formRenderer.hideEditForm(overlay);
        }
        
        if (this.state.activeEditor === contentId) {
            this.state.activeEditor = null;
        }
    }

    /**
     * Update markdown preview (called by form renderer)
     * @param {HTMLElement} previewElement - Preview container
     * @param {string} markdown - Markdown content
     */
    updateMarkdownPreview(previewElement, markdown) {
        if (this.markdownProcessor.isReady()) {
            const html = this.markdownProcessor.createPreview(markdown);
            previewElement.innerHTML = html;
        } else {
            previewElement.innerHTML = '<p><em>Markdown processor not available</em></p>';
        }
    }

    /**
     * Render markdown content (called by content manager)
     * @param {HTMLElement} element - Element to update
     * @param {string} markdownText - Markdown content
     */
    renderMarkdown(element, markdownText) {
        if (this.markdownProcessor.isReady()) {
            this.markdownProcessor.applyToElement(element, markdownText);
        } else {
            console.warn('Markdown processor not available');
            element.textContent = markdownText;
        }
    }

    // Authentication and UI methods (simplified)
    
    /**
     * Setup authentication controls
     */
    setupAuthenticationControls() {
        const authToggle = document.getElementById('auth-toggle');
        const editToggle = document.getElementById('edit-mode-toggle');
        
        if (authToggle) {
            authToggle.addEventListener('click', () => this.toggleAuthentication());
        }
        
        if (editToggle) {
            editToggle.addEventListener('click', () => this.toggleEditMode());
        }
    }

    /**
     * Toggle authentication state
     */
    toggleAuthentication() {
        this.state.isAuthenticated = !this.state.isAuthenticated;
        this.state.currentUser = this.state.isAuthenticated ? { name: 'Demo User' } : null;
        
        if (!this.state.isAuthenticated) {
            this.state.editMode = false;
        }
        
        this.updateBodyClasses();
        this.updateStatusIndicator();
        
        const authBtn = document.getElementById('auth-toggle');
        if (authBtn) {
            authBtn.textContent = this.state.isAuthenticated ? 'Logout' : 'Login as Client';
        }
    }

    /**
     * Toggle edit mode
     */
    toggleEditMode() {
        if (!this.state.isAuthenticated) return;
        
        this.state.editMode = !this.state.editMode;
        
        if (!this.state.editMode && this.state.activeEditor) {
            this.cancelEditing(this.state.activeEditor);
        }
        
        this.updateBodyClasses();
        this.updateStatusIndicator();
        
        const editBtn = document.getElementById('edit-mode-toggle');
        if (editBtn) {
            editBtn.textContent = `Edit Mode: ${this.state.editMode ? 'On' : 'Off'}`;
        }
    }

    /**
     * Update body CSS classes based on state
     */
    updateBodyClasses() {
        document.body.classList.toggle('insertr-authenticated', this.state.isAuthenticated);
        document.body.classList.toggle('insertr-edit-mode', this.state.editMode);
        
        const editToggle = document.getElementById('edit-mode-toggle');
        if (editToggle) {
            editToggle.style.display = this.state.isAuthenticated ? 'inline-block' : 'none';
        }
    }

    /**
     * Create status indicator
     */
    createStatusIndicator() {
        // Implementation similar to original, simplified for brevity
        this.updateStatusIndicator();
    }

    /**
     * Update status indicator
     */
    updateStatusIndicator() {
        // Implementation similar to original, simplified for brevity
        console.log(`Status: Auth=${this.state.isAuthenticated}, Edit=${this.state.editMode}`);
    }

    /**
     * Get configuration instance (for external customization)
     * @returns {InsertrConfig} Configuration instance
     */
    getConfig() {
        return this.config;
    }

    /**
     * Get content manager instance
     * @returns {InsertrContentManager} Content manager instance
     */
    getContentManager() {
        return this.contentManager;
    }
}

// Export for module usage
if (typeof module !== 'undefined' && module.exports) {
    module.exports = Insertr;
}

// Auto-initialize when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
    window.insertr = new Insertr();
});