/**
 * main.js — YOOtheme Alchemy Controller
 * Architecture: ES6 Modules | Async/Await | Event Delegation
 * * "The Hand that wields the logic."
 */

// === CONFIGURATION ===
const CONFIG = {
    API_ENDPOINT: "/gradio_api/call/predict", // Points to local Gradio instance
    ANIMATION_DURATION: 300,
    DEBOUNCE_DELAY: 150
};

// === UTILITIES ===
const Utils = {
    debounce(func, wait) {
        let timeout;
        return function(...args) {
            clearTimeout(timeout);
            timeout = setTimeout(() => func.apply(this, args), wait);
        };
    },
    
    sanitize(str) {
        const div = document.createElement('div');
        div.textContent = str;
        return div.innerHTML;
    },

    copyToClipboard(text) {
        navigator.clipboard.writeText(text).then(() => {
            UI.showToast("✨ Code copied to clipboard", "success");
        }).catch(err => {
            UI.showToast("❌ Failed to copy", "error");
            console.error(err);
        });
    }
};

// === API CLIENT ===
class AlchemyClient {
    constructor(endpoint) {
        this.endpoint = endpoint;
    }

    async generate(prompt, componentType) {
        try {
            // Simulating connection to the Gradio Backend (app.py)
            // Note: Actual implementation depends on specific Gradio API exposure
            const response = await fetch(this.endpoint, {
                method: "POST",
                headers: { "Content-Type": "application/json" },
                body: JSON.stringify({ 
                    data: [prompt, [], componentType] // Standard Gradio payload structure
                })
            });

            if (!response.ok) throw new Error(`HTTP Error: ${response.status}`);
            
            const result = await response.json();
            return result.data ? result.data[0] : null;

        } catch (error) {
            console.error("Alchemy API Error:", error);
            throw error;
        }
    }
}

// === UI CONTROLLER ===
class UIController {
    constructor() {
        this.elements = {
            input: document.getElementById('user-prompt'),
            generateBtn: document.getElementById('generate-btn'),
            outputContainer: document.getElementById('code-output'),
            outputPre: document.getElementById('output-pre'),
            componentSelect: document.getElementById('component-select'),
            loader: document.getElementById('alchemy-loader'),
            toast: document.getElementById('toast-container')
        };
        
        this.client = new AlchemyClient(CONFIG.API_ENDPOINT);
        this.initEventListeners();
    }

    initEventListeners() {
        // Generate Button
        this.elements.generateBtn.addEventListener('click', () => this.handleGeneration());

        // Ctrl+Enter Shortcut
        this.elements.input.addEventListener('keydown', (e) => {
            if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
                this.handleGeneration();
            }
        });

        // Copy Button (Event Delegation)
        document.addEventListener('click', (e) => {
            if (e.target.closest('.copy-btn')) {
                const code = this.elements.outputPre.textContent;
                Utils.copyToClipboard(code);
            }
        });
    }

    setLoading(isLoading) {
        if (isLoading) {
            this.elements.generateBtn.disabled = true;
            this.elements.generateBtn.innerHTML = `<span>Transmuting...</span> <div class="spinner"></div>`;
            this.elements.outputContainer.classList.add('opacity-50', 'blur-sm');
        } else {
            this.elements.generateBtn.disabled = false;
            this.elements.generateBtn.innerHTML = `<span>Generate Code</span> <span class="icon">✨</span>`;
            this.elements.outputContainer.classList.remove('opacity-50', 'blur-sm');
        }
    }

    async handleGeneration() {
        const prompt = this.elements.input.value.trim();
        const type = this.elements.componentSelect.value;

        if (!prompt) {
            this.showToast("⚠️ Please enter a prompt first.", "warning");
            return;
        }

        this.setLoading(true);

        try {
            // For demo purposes, if API is not connected, we mock a response 
            // to show the UI behavior (remove this in production)
            const result = await this.client.generate(prompt, type).catch(() => {
                // Fallback mock for UI demonstration if backend isn't reachable
                return new Promise(resolve => setTimeout(() => resolve(`\n<div class="uk-section uk-section-default">\n  <div class="uk-container">\n    <h1>${Utils.sanitize(prompt)}</h1>\n    \n  </div>\n</div>`), 1500));
            });

            this.renderOutput(result);
            this.showToast("✅ Generation Complete", "success");
        } catch (error) {
            this.showToast("❌ System Error: Could not reach Alchemy Core.", "error");
        } finally {
            this.setLoading(false);
        }
    }

    renderOutput(code) {
        // Simple syntax highlighting simulation
        const highlighted = Utils.sanitize(code)
            .replace(/&lt;/g, '<').replace(/&gt;/g, '>') // Revert for display
            .replace(/(".+?")/g, '<span class="token-string">$1</span>')
            .replace(/(&lt;\/?.+?&gt;)/g, '<span class="token-tag">$1</span>');

        this.elements.outputPre.innerHTML = highlighted;
        
        // Animate in
        this.elements.outputContainer.classList.remove('hidden');
        this.elements.outputContainer.animate([
            { opacity: 0, transform: 'translateY(20px)' },
            { opacity: 1, transform: 'translateY(0)' }
        ], { duration: 400, easing: 'cubic-bezier(0.2, 0.8, 0.2, 1)' });
    }

    showToast(message, type = 'info') {
        const toast = document.createElement('div');
        toast.className = `toast toast-${type}`;
        toast.textContent = message;
        
        this.elements.toast.appendChild(toast);
        
        // Remove after 3s
        setTimeout(() => {
            toast.style.opacity = '0';
            setTimeout(() => toast.remove(), 300);
        }, 3000);
    }
}

// === BOOTSTRAP ===
document.addEventListener('DOMContentLoaded', () => {
    window.UI = new UIController();
    console.log("⚡ Alchemy Client Initialized");
});