// Clock simulation engine
import { state } from './state.js';
import { evaluateAll } from './gates.js';
import { forceRecordSample } from './waveform.js';

export function simTick() {
    // Toggle all CLOCK gates
    state.gates.forEach(g => {
        if (g.type === 'CLOCK') {
            g.value = g.value ? 0 : 1;
        }
    });
    evaluateAll();
    // Force record even if evaluateAll didn't detect change
    if (state.recording && state.waveformVisible) {
        forceRecordSample();
    }
}

export function startSim() {
    if (state.simRunning) return;
    const hasClocks = state.gates.some(g => g.type === 'CLOCK');
    if (!hasClocks) { alert('Place a CLOCK gate first!'); return; }

    state.simRunning = true;

    // Auto-open waveform panel
    if (!state.waveformVisible) {
        state.waveformVisible = true;
        document.getElementById('waveform-panel').classList.add('visible');
        document.getElementById('sim-btn').classList.add('active');
        // Trigger resize via event so renderer picks it up
        window.dispatchEvent(new Event('resize'));
    }

    state.simInterval = setInterval(simTick, state.simSpeed);
    updateSimUI();
}

export function stopSim() {
    state.simRunning = false;
    if (state.simInterval) clearInterval(state.simInterval);
    state.simInterval = null;
    updateSimUI();
}

export function updateSimUI() {
    const btn = document.getElementById('sim-run-btn');
    if (state.simRunning) {
        btn.textContent = '⏹ Stop';
        btn.classList.add('active');
    } else {
        btn.textContent = '▶ Run';
        btn.classList.remove('active');
    }
    document.getElementById('sim-speed-label').textContent = `${state.simSpeed}ms`;
}

export function adjustSpeed(delta) {
    state.simSpeed = Math.max(50, Math.min(2000, state.simSpeed + delta));
    if (state.simRunning) {
        clearInterval(state.simInterval);
        state.simInterval = setInterval(simTick, state.simSpeed);
    }
    updateSimUI();
}