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'use strict'

const stringWidth = require('string-width')

function ansiAlign (text, opts) {

if (!text) return text

opts = opts || {}

const align = opts.align || 'center'

// short-circuit `align: 'left'` as no-op

if (align === 'left') return text

const split = opts.split || '\n'

const pad = opts.pad || ' '

const widthDiffFn = align !== 'right' ? halfDiff : fullDiff

let returnString = false

if (!Array.isArray(text)) {

returnString = true

text = String(text).split(split)

}

let width

let maxWidth = 0

text = text.map(function (str) {

str = String(str)

width = stringWidth(str)

maxWidth = Math.max(width, maxWidth)

return {

str,

width

}

}).map(function (obj) {

return new Array(widthDiffFn(maxWidth, obj.width) + 1).join(pad) + obj.str

})

return returnString ? text.join(split) : text

}

ansiAlign.left = function left (text) {

return ansiAlign(text, { align: 'left' })

}

ansiAlign.center = function center (text) {

return ansiAlign(text, { align: 'center' })

}

ansiAlign.right = function right (text) {

return ansiAlign(text, { align: 'right' })

}

module.exports = ansiAlign

function halfDiff (maxWidth, curWidth) {

return Math.floor((maxWidth - curWidth) / 2)

}

function fullDiff (maxWidth, curWidth) {

return maxWidth - curWidth

}