// RMScript App - Frontend Application
// Connects to the settings_app backend for compilation and server-side execution

// API is served from same origin (settings_app)
const API_BASE = '';

// Global state
const state = {
    currentIR: null,
    isExecuting: false
};

// DOM elements
const elements = {
    editor: document.getElementById('editor'),
    compileStatus: document.getElementById('compileStatus'),
    robotStatus: document.getElementById('robotStatus'),
    console: document.getElementById('console'),
    irDisplay: document.getElementById('irDisplay'),
    executionInfo: document.getElementById('executionInfo'),
    executeBtn: document.getElementById('executeBtn')
};

// Example scripts
const examples = {
    basic: `look left
wait 1s
look right
wait 1s
look center`,

    complex: `look left
antenna both up
wait 1s
look right
antenna both down
wait 0.5s
look center`,

    repeat: `repeat 3
  look left
  wait 0.5s
  look right
  wait 0.5s
look center`
};

// Update compile status UI
function updateCompileStatus(status, message) {
    const dot = status === 'success' ? 'green' : status === 'error' ? 'red' : 'gray';
    elements.compileStatus.className = `status ${status}`;
    elements.compileStatus.innerHTML = `<span><span class="status-dot ${dot}"></span>${message}</span>`;
}

// Log to console
function log(message, type = 'info') {
    const line = document.createElement('div');
    line.className = `console-line ${type}`;
    line.textContent = `[${new Date().toLocaleTimeString()}] ${message}`;
    elements.console.appendChild(line);
    elements.console.scrollTop = elements.console.scrollHeight;
}

// Clear console
function clearConsole() {
    elements.console.innerHTML = '';
}

// Load example script
function loadExample(exampleName) {
    if (examples[exampleName]) {
        elements.editor.value = examples[exampleName];
        log(`Loaded ${exampleName} example`, 'info');
    }
}

// Clear editor
function clearEditor() {
    elements.editor.value = '';
    state.currentIR = null;
    elements.irDisplay.innerHTML = '<div style="color: #999; text-align: center; padding: 20px;">No IR yet. Verify a script first!</div>';
    updateCompileStatus('idle', 'Ready');
}

// Verify script (syntax and semantics only)
async function verifyScript() {
    const source = elements.editor.value.trim();

    if (!source) {
        log('Editor is empty', 'warning');
        return;
    }

    clearConsole();
    log('Verifying script...', 'info');
    updateCompileStatus('idle', 'Verifying...');

    try {
        const response = await fetch(`${API_BASE}/api/verify`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ source })
        });

        const result = await response.json();

        if (result.success) {
            log('Verification successful!', 'success');
            if (result.name) log(`  Name: ${result.name}`, 'info');
            if (result.description) log(`  Description: ${result.description}`, 'info');

            if (result.warnings.length > 0) {
                result.warnings.forEach(w => {
                    log(`  Warning (line ${w.line}): ${w.message}`, 'warning');
                });
            }

            updateCompileStatus('success', 'Valid script');
        } else {
            log('Verification failed', 'error');
            result.errors.forEach(e => {
                log(`  Error (line ${e.line}): ${e.message}`, 'error');
            });
            updateCompileStatus('error', 'Invalid script');
        }
    } catch (error) {
        log(`Backend error: ${error.message}`, 'error');
        updateCompileStatus('error', 'Backend error');
    }
}

// Compile script to IR
async function compileScript() {
    const source = elements.editor.value.trim();

    if (!source) {
        log('Editor is empty', 'warning');
        return null;
    }

    log('Compiling script to IR...', 'info');
    updateCompileStatus('idle', 'Compiling...');

    try {
        const response = await fetch(`${API_BASE}/api/compile`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ source })
        });

        const result = await response.json();

        if (result.success) {
            log(`Compiled ${result.ir.length} actions`, 'success');

            if (result.warnings.length > 0) {
                result.warnings.forEach(w => {
                    log(`  Warning (line ${w.line}): ${w.message}`, 'warning');
                });
            }

            state.currentIR = result.ir;
            displayIR(result.ir);
            updateCompileStatus('success', `${result.ir.length} actions ready`);
            return result.ir;
        } else {
            log('Compilation failed', 'error');
            result.errors.forEach(e => {
                log(`  Error (line ${e.line}): ${e.message}`, 'error');
            });
            updateCompileStatus('error', 'Compilation failed');
            return null;
        }
    } catch (error) {
        log(`Backend error: ${error.message}`, 'error');
        updateCompileStatus('error', 'Backend error');
        return null;
    }
}

// Display IR in the UI
function displayIR(ir) {
    if (!ir || ir.length === 0) {
        elements.irDisplay.innerHTML = '<div style="color: #999; text-align: center; padding: 20px;">No actions</div>';
        return;
    }

    const html = ir.map((action, idx) => {
        let details = '';

        if (action.type === 'action') {
            details = `Duration: ${action.duration}s`;
            if (action.head_pose) details += ', Head movement';
            if (action.antennas) details += `, Antennas: [${action.antennas.map(a => a.toFixed(2)).join(', ')}]`;
            if (action.body_yaw !== null) details += `, Body yaw: ${action.body_yaw.toFixed(2)}`;
        } else if (action.type === 'wait') {
            details = `Wait ${action.duration}s`;
        } else if (action.type === 'picture') {
            details = 'Take picture';
        } else if (action.type === 'sound') {
            details = `Play "${action.sound_name}"`;
            if (action.blocking) details += ' (blocking)';
            if (action.loop) details += ' (loop)';
        }

        return `
            <div class="ir-action">
                <div class="ir-action-type">${idx + 1}. ${action.type.toUpperCase()}</div>
                <div class="ir-action-details">${details}</div>
            </div>
        `;
    }).join('');

    elements.irDisplay.innerHTML = html;
}

// Execute script on robot (server-side via SDK)
async function executeScript() {
    if (state.isExecuting) {
        log('Already executing a script', 'warning');
        return;
    }

    // Compile the current editor content
    const ir = await compileScript();
    if (!ir) {
        log('Cannot execute - compilation failed', 'error');
        return;
    }

    // Execute via server-side SDK
    state.isExecuting = true;
    elements.executeBtn.disabled = true;
    clearExecutionInfo();
    logExecution('Sending to robot...', 'info');

    try {
        const response = await fetch(`${API_BASE}/api/execute`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ ir })
        });

        const result = await response.json();

        if (result.success) {
            logExecution(`Execution complete! ${result.actions_executed} actions executed.`, 'success');
        } else {
            logExecution(`Execution failed: ${result.message}`, 'error');
        }
    } catch (error) {
        logExecution(`Execution error: ${error.message}`, 'error');
    } finally {
        state.isExecuting = false;
        elements.executeBtn.disabled = false;
    }
}

// Log execution info
function logExecution(message, type = 'info') {
    const line = document.createElement('div');
    line.className = `console-line ${type}`;
    line.textContent = `[${new Date().toLocaleTimeString()}] ${message}`;
    elements.executionInfo.appendChild(line);
    elements.executionInfo.scrollTop = elements.executionInfo.scrollHeight;
}

// Clear execution info
function clearExecutionInfo() {
    elements.executionInfo.innerHTML = '';
}

// Initialize application
function init() {
    console.log('Initializing RMScript App');
    loadExample('basic');
    console.log('RMScript App ready');
}

// Start when DOM is loaded
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
} else {
    init();
}