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 utxos = []

const handleBuy = (utxo) => {
	utxo.Remaining = new BN(utxo.ReceivedQuantity)
	utxos.push(utxo)
}

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

const consumeUtxos = (amount) => {
	for (let i = utxos.length - 1; i >= 0; i--) {
		const utxo = utxos[i]

		if (!utxo.Remaining) continue

		if (utxo.Remaining.gt(amount)) {
			utxo.Remaining = utxo.Remaining.minus(amount)
			return
		} else {
			amount = amount.minus(utxo.Remaining)
			utxo.Remaining = 0
			return consumeUtxos(amount)
		}
	}
}

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

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

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

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

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