import init, { make_interp } from './pkg/automathon.js';

function wordlistElts(wordlist) {
    return wordlist.map((bc, i) => {
        const bcElt = document.createElement('x-bytecode');
        bcElt.setAttribute('x-index', i);
        for (let i = 0; i < bc.len(); i++) {
            const opElt = document.createElement('x-op');
            opElt.setAttribute('x-index', i);
            opElt.textContent = bc.at(i);
            bcElt.appendChild(opElt);
        }
        return bcElt;
    })
}

function selectorForIP(word, offset) {
    const sel = `#wordlist x-bytecode[x-index='${word}'] x-op[x-index='${offset}']`;
    console.debug('using sel', sel);
    return sel;
}

async function loaded() {
    console.debug('running init');
    const mod = await init();
    console.debug('init done', mod);
    const interp = make_interp();

    document.querySelector('#compile').onclick = e => {
        console.debug('compile clicked', e);

        let wordlistContainer = document.querySelector('#wordlist');
        while (wordlistContainer.lastChild) {
            console.debug('removing child', wordlistContainer.lastChild)
            wordlistContainer.removeChild(wordlistContainer.lastChild);
        }
        console.debug('container has firstchild', wordlistContainer.firstChild)

        // always add a newline until i decide what to do with the parser.
        const text = document.querySelector('textarea').value + '\n';
        const start = performance.now();
        const res = interp.compile(text);
        const end = performance.now();
        console.info(`compile took ${end-start} ms`);
        if (res) {
            const wordlist = wordlistElts(interp.wordlist());
            wordlist.forEach(elt => wordlistContainer.appendChild(elt));
            const sel = selectorForIP(0, 0);
            document.querySelectorAll(sel).forEach(e => {
                e.classList.add('ip')
            });
        }
    };
    document.querySelector('#tick').onclick = e => {
        console.debug('tick clicked', e);
        interp.tick();
        console.info('callstack', interp.callstack());
        console.info('stack', interp.stack());

        const { word, offset } = interp.ip();
        console.info('ip', word, offset);
        document.querySelectorAll('#wordlist .ip').forEach(e => e.classList.remove('ip'));
        const sel = selectorForIP(word, offset);
        document.querySelectorAll(sel).forEach(e => {
            e.classList.add('ip')
        });
    };
    document.querySelector('#run').onclick = e => {
        console.debug('run clicked', e);
        const start = performance.now();
        let tickCount = 0;
        for (let i = 0; i < 1_000_000; i++) {
            tickCount += interp.run();
        }
        const end = performance.now();
        console.info(`run took ${end-start} ms for ${tickCount} ticks (${(end-start)/tickCount * 1000000} µs/tick).`);
        console.info('result', interp.stack());
    };
    window.interp = interp;
}

document.addEventListener('DOMContentLoaded', loaded);