const csvToJson = require('convert-csv-to-json')
const converter = require('json-2-csv')
const fs = require('fs')
const BN = require('bignumber.js')

const coin = process.argv[2]

const pre2022 = csvToJson.fieldDelimiter(',').getJsonFromCsv(`./${coin}.csv`)

const lots = []

const handleBuy = (lot) => {
	lot.Remaining = new BN(lot.ReceivedQuantity)
	lots.push(lot)
}

const handleTrade = (trade) => {
	if (trade.ReceivedCurrency === coin) return handleBuy(trade)
	consumeLots(new BN(trade.SentQuantity))
}

const consumeLots = (amount) => {
	for (let i = lots.length - 1; i >= 0; i--) {
		const lot = lots[i]

		if (!lot.Remaining) continue

		if (lot.Remaining.gt(amount)) {
			lot.Remaining = lot.Remaining.minus(amount)
			return
		} else {
			amount = amount.minus(lot.Remaining)
			lot.Remaining = 0
			return consumeLots(amount)
		}
	}
}

pre2022.forEach(tx => {
	if (tx.Ignored || tx.Margin) return

	switch (tx.Type) {
		case 'Buy':
		case 'Receive':
			handleBuy(tx)
			break
		case 'Sell':
		case 'Send':
			consumeLots(new BN(tx.SentQuantity))
			break
		case 'Trade':
			handleTrade(tx)
			break
		case 'Transfer':
			break
	}

	if (tx.FeeCurrency === coin) consumeLots(new BN(tx.FeeAmount))
})

const remaining = lots
	.filter(lot => !!lot.Remaining)
	.map(lot => {
		return {
			Date: lot.Date,
			Asset: coin,
			Credit: lot.Remaining.toFixed(8),
			Debit: '',
			Price: new BN(lot['ReceivedCostBasis(USD)']).div(lot.ReceivedQuantity).toFixed(4),
			Original: lot.ReceivedQuantity,
		}
	}
)

converter.json2csv(remaining).then(csv =>
	fs.appendFileSync(`./${coin}-lots.csv`, csv)
);