lacymorrow/crossover

/* eslint-disable no-bitwise */

const { DEBOUNCE_DELAY } = require( './config' )

/* Utilities */
const debounce = ( func, delay = DEBOUNCE_DELAY ) => {

    let debounceTimer

    return function ( ...args ) {

        clearTimeout( debounceTimer )

        // Pass { abort: true } to cancel
        if ( args[0] && args[0].abort ) {

            return

        }

        debounceTimer = setTimeout( () => func.apply( this, args ), delay )

    }

}

// checkboxTrue( preferences.value( 'actions.followMouse' ), 'followMouse' )
const checkboxTrue = ( value, key ) => ( typeof value === 'object' && value.includes( key ) )

/**
 * Check for libappindicator1 support before creating tray icon
 */
const checkLinuxTraySupport = cb => {

    const cp = require( 'child_process' )

    // Check that we're on Ubuntu (or another debian system) and that we have
    // libappindicator1. If WebTorrent was installed from the deb file, we should
    // always have it. If it was installed from the zip file, we might not.
    cp.exec( 'dpkg --get-selections libappindicator1', ( error, stdout ) => {

        if ( error ) {

            return cb( false )

        }

        // Unfortunately there's no cleaner way, as far as I can tell, to check
        // whether a debian package is installed:
        cb( stdout.endsWith( '\tinstall\n' ) )

    } )

}

/* eslint-disable no-prototype-builtins */
/**
 * Recursively Object.freeze() on objects and functions
 * @see https://github.com/substack/deep-freeze
 * @param o Object on which to lock the attributes
 */
const deepFreeze = o => {

    Object.freeze( o )

    for ( const prop of Object.getOwnPropertyNames( o ) ) {

        if ( o.hasOwnProperty( prop )
            && o[prop] !== null
            && ( typeof o[prop] === 'object' || typeof o[prop] === 'function' )
            && !Object.isFrozen( o[prop] ) ) {

            deepFreeze( o[prop] )

        }

    }

    return o

}

const hexToRgbA = ( hex, alpha ) => {

    let c
    if ( /^#([A-Fa-f0-9]{3}){1,2}$/.test( hex ) ) {

        c = hex.substring( 1 ).split( '' )
        if ( c.length === 3 ) {

            c = [
                c[0], c[0], c[1], c[1], c[2], c[2],
            ]

        }

        c = '0x' + c.join( '' )

        return `rgba(${[
            ( c >> 16 ) & 255, ( c >> 8 ) & 255, c & 255,
        ].join( ',' )}, ${alpha})`

    }

    // throw new Error( 'Bad Hex' )
    console.warn( 'Bad Hex' )

    return hex // return original

}

/* eslint-enable */

module.exports = {
    checkboxTrue,
    checkLinuxTraySupport,
    debounce,
    deepFreeze,
    hexToRgbA,
}