/**
 * DebugPanel Component
 *
 * Extracted from monolithic editor.js as part of architecture refactoring.
 * Handles debug message display and management for client-side debugging.
 *
 * Dependencies:
 * - None (standalone component)
 */

/**
 * DebugPanel - Manages debug message display and interaction
 */
class DebugPanel {
    constructor() {
        this.messages = [];
        this.isActive = false;
        this.maxMessages = 1000; // Keep last 1000 messages
    }

    /**
     * Add a debug message
     */
    addMessage(message, category = 'INFO') {
        const messageObj = {
            message,
            category,
            timestamp: new Date().toLocaleTimeString()
        };

        this.messages.push(messageObj);

        // Keep only last maxMessages
        if (this.messages.length > this.maxMessages) {
            this.messages = this.messages.slice(-this.maxMessages);
        }

        // Auto-update if panel is visible
        if (this.isActive) {
            this.update();
        }
    }

    /**
     * Toggle the debug panel on/off
     */
    toggle() {
        const debugContainer = document.getElementById('debug-messages-container');
        const debugButton = document.getElementById('toggle-debug');

        if (!debugContainer || !debugButton) {
            console.warn('DebugPanel: Required DOM elements not found');
            return;
        }

        if (this.isActive) {
            this.hide();
        } else {
            this.show();
        }
    }

    /**
     * Show the debug panel
     */
    show() {
        const debugContainer = document.getElementById('debug-messages-container');
        const debugButton = document.getElementById('toggle-debug');

        if (!debugContainer || !debugButton) {
            console.warn('DebugPanel: Required DOM elements not found');
            return;
        }

        debugContainer.style.display = 'block';
        debugButton.textContent = '🔍 Debug (ON)';
        debugButton.style.background = '#28a745';
        this.isActive = true;
        this.update();
    }

    /**
     * Hide the debug panel
     */
    hide() {
        const debugContainer = document.getElementById('debug-messages-container');
        const debugButton = document.getElementById('toggle-debug');

        if (!debugContainer || !debugButton) {
            console.warn('DebugPanel: Required DOM elements not found');
            return;
        }

        debugContainer.style.display = 'none';
        debugButton.textContent = '🔍 Debug';
        debugButton.style.background = '#6c757d';
        this.isActive = false;
    }

    /**
     * Update the debug panel with current messages
     */
    update() {
        const debugContainer = document.getElementById('debug-messages-container');
        if (!debugContainer || !this.isActive) {
            return;
        }

        if (this.messages.length === 0) {
            debugContainer.innerHTML = '<div style="color: #6c757d; font-style: italic; padding: 12px;">No debug messages yet. Click sections to generate debug output.</div>';
            return;
        }

        // Show the last 50 messages in reverse order (newest first)
        const recentMessages = this.messages.slice(-50).reverse();

        const messagesHtml = recentMessages.map(msg => {
            const categoryColor = {
                'INFO': '#17a2b8',
                'WARNING': '#ffc107',
                'ERROR': '#dc3545',
                'SUCCESS': '#28a745',
                'DEBUG': '#6f42c1'
            }[msg.category] || '#6c757d';

            return `
                <div style="margin-bottom: 6px; padding: 4px; border-left: 3px solid ${categoryColor}; background: white; border-radius: 2px;">
                    <span style="color: #6c757d; font-size: 11px;">[${msg.timestamp}]</span>
                    <span style="color: ${categoryColor}; font-weight: bold;">${msg.category}:</span>
                    <span style="color: #333;">${msg.message}</span>
                </div>
            `;
        }).join('');

        debugContainer.innerHTML = `
            <div style="margin-bottom: 8px; padding: 6px; background: #e9ecef; border-radius: 4px; font-weight: bold; color: #495057;">
                Debug Messages (${this.messages.length} total, showing last ${recentMessages.length})
                <button id="debug-clear-btn" style="float: right; background: #dc3545; color: white; border: none; padding: 2px 6px; border-radius: 2px; font-size: 11px; cursor: pointer;">Clear</button>
            </div>
            <div style="max-height: 250px; overflow-y: auto;">
                ${messagesHtml}
            </div>
        `;

        // Add event listener for clear button
        const clearBtn = debugContainer.querySelector('#debug-clear-btn');
        if (clearBtn) {
            clearBtn.addEventListener('click', () => {
                this.clear();
            });
        }

        // Auto-scroll to bottom to show newest messages
        const scrollContainer = debugContainer.querySelector('div[style*="overflow-y"]');
        if (scrollContainer) {
            scrollContainer.scrollTop = scrollContainer.scrollHeight;
        }
    }

    /**
     * Clear all debug messages
     */
    clear() {
        this.messages = [];
        this.update();
    }

    /**
     * Get the number of messages
     */
    getMessageCount() {
        return this.messages.length;
    }

    /**
     * Get recent messages
     */
    getRecentMessages(count = 10) {
        return this.messages.slice(-count);
    }
}

// Export for use in tests and other modules
if (typeof module !== 'undefined' && module.exports) {
    module.exports = { DebugPanel };
}

// Export for browser use
if (typeof window !== 'undefined') {
    window.DebugPanel = DebugPanel;
}