centurion/backend/src/timeline.js

const timeline = require('../data/timeline.js');

/**
 *
 * @param i
 * @returns {*}
 */
function getIndex(i) {
    if (i >= timeline.length) {
        return;
    }

    return timeline[i];
}

/**
 * @param {number} i - the index.
 * @returns {{count: number, timestamp: number}|undefined}
 */
function getNextShot(i) {
    for (; i < timeline.length; i++) {
        const time = getIndex(i);

        for (let event of time.events) {
            if (event.type === 'shot') {
                return {
                    timestamp: time.timestamp,
                    count: event.shotCount
                }
            }
        }
    }

    return undefined;
}

function indexForTime(seconds) {
    let lastIndex = 0;
    for(let i = 0; i < timeline.length; i++) {
        const time = timeline[i];

        if (time.timestamp >= seconds) {
            return lastIndex;
        }

        lastIndex = i;
    }
}

module.exports = {
    getIndex, getNextShot, indexForTime
};