const durationToHumanReadable = require("./durationToHumanReadable");
const moment = require("moment");
const _ = require("lodash");
const crypto = require('crypto');

const getColor = (key) => {
    const hash = crypto.createHash('sha256');
    hash.update(key);
    const hashedKey = hash.digest('hex');
    const num = parseInt(hashedKey, 16);
    return '#' + (num % 16777215).toString(16).padStart(6, '0');
};

const calculateStatusDuration = (transitions) => {
    let statusDuration = {};
    let totalDuration = 0;
    let summations = [];

    transitions.forEach((transition, index) => {
        let duration = transition.duration;
        totalDuration += duration;

        if (!transition.prev_value) {
            statusDuration[transition.value] = {
                value: duration,
                humanReadable: transition.duration_readable
            };
        } else if (!transition.next_value) {
            if (statusDuration[transition.value]) {
                statusDuration[transition.value].value += duration;
                statusDuration[transition.value].humanReadable = transition.duration_readable;
            } else {
                statusDuration[transition.value] = {
                    value: duration,
                    humanReadable: transition.duration_readable
                };
            }
        } else {
            if (statusDuration[transition.value]) {
                statusDuration[transition.value].value += duration;
                statusDuration[transition.value].humanReadable = transition.duration_readable;
            } else {
                statusDuration[transition.value] = {
                    value: duration,
                    humanReadable: transition.duration_readable
                };
            }
        }
    });

    // Calculate the percentage for each status
// Calculate the percentage for each status
    let totalPercentage = 0;
    const statusKeys = Object.keys(statusDuration);
    statusKeys.forEach((status, index) => {
        if (index !== statusKeys.length - 1) {
            const percentage = (statusDuration[status].value / totalDuration) * 100;
            totalPercentage += percentage;
            statusDuration[status].percentage = percentage;
        } else {
            statusDuration[status].percentage = 100 - totalPercentage;
        }
    });

    for (let [status, {value, humanReadable}] of Object.entries(statusDuration)) {
        if (status !== 'total') {
            summations.push({status, value, humanReadable, percentage: statusDuration[status].percentage, color: getColor(status), roundedPercentage: `${Math.round(statusDuration[status].percentage)}%`});
        }
    }

    const humanReadableTotal = durationToHumanReadable(moment.duration(totalDuration));

    return {
        summations: _.orderBy(summations, ['value'], ['asc']),
        totalStatuses: summations.length,
        total: totalDuration,
        humanReadableTotal
    };
}
module.exports = calculateStatusDuration;