'use strict'

const moment = require('moment-timezone')



const dateTime = (tz, date, time) => {
	let offset = 0 // in days
	if (time.length > 6) {
		offset = +time.slice(0, -6)
		time = time.slice(-6)
	}
	return moment.tz(date + 'T' + time, tz)
	.add(offset, 'days')
	.valueOf()
}



const types = {P: 'poi', S: 'station', A: 'address'}
// todo: what is s.rRefL?
const location = (l) => {
	const type = types[l.type] || 'unknown'
	const result = {
		  type, name: l.name
		, latitude:  l.crd ? l.crd.y / 1000000 : null
		, longitude: l.crd ? l.crd.x / 1000000 : null
	}
	if (type === 'poi' || type === 'station') result.id = parseInt(l.extId)
	if ('pCls' in l) result.products = l.pCls
	return result
}



// todo: what is p.number vs p.line?
// todo: what is p.icoX?
// todo: what is p.cls?
// todo: what is p.oprX?
const product = (p) => {
	if (!p.prodCtx) return null
	return {
		name: p.name, nr: +p.number, class: p.cls,
		productCode: +p.prodCtx.catCode, productName: p.prodCtx.catOutS
	}
}



const remark = (r) => null // todo



const agency = (a) => a.name




// todo: what is d.jny.dirFlg?
// todo: d.stbStop.dProgType
// todo: what is d.stbStop.dTimeR?
// tz = timezone, s = stations, p = products, r = remarks
const departure = (tz, s, p, r) => (d) => {
	const result = {
		  station:   s[parseInt(d.stbStop.locX)]
		, when:      new Date(dateTime(tz, d.date, d.stbStop.dTimeR || d.stbStop.dTimeS))
		, direction: shorten(d.dirTxt) // todo: parse this
		, product:   p[parseInt(d.prodX)]
		, remarks:   d.remL ? d.remL.map((rm) => r[parseInt(rm.remX)]) : null
		, trip:      +d.jid.split('|')[1]
	}
	if (d.stbStop.dTimeR && d.stbStop.dTimeS) result.delay =
		dateTime(tz, d.date, d.stbStop.dTimeR) - dateTime(tz, d.date, d.stbStop.dTimeS)
	return result
}
module.exports = {
	dateTime,
	location, product, remark, agency,
	departure
}