package colinearmath

import (
	"math/big"
	"time"
)

// Calculate amount due to provider assuming linear payout schedule.
//
// Does NOT account for anything out-of-bounds. This must be checked beforehand.
func CalcAmountVestableLinear(
	total *big.Int,
	remaining *big.Int,
	date time.Time,
	beginDate time.Time,
	endDate time.Time,
) (*big.Int, error) {
	timePassed := big.NewInt(date.Unix() - beginDate.Unix())
	totalTime := big.NewInt(endDate.Unix() - beginDate.Unix())

	taken := big.NewInt(0)
	taken.Sub(total, remaining)

	out := big.NewInt(0)
	out.Mul(total, timePassed)
	out.Div(out, totalTime)
	out.Sub(out, taken)

	return out, nil
}

// No longer using exponential - use linear distribution schedule
// because exponential rewards are a weak incentive for providers

// func CalcAmountVestableExponential(
// 	ctx sdk.Context,
// 	total big.Int,
// 	remaining big.Int,
// 	date time.Time,
// 	beginDate time.Time,
// 	endDate time.Time,
// ) big.Int {
// 	timescale := big.NewInt(endDate.Unix() - beginDate.Unix())
// 	timePassed := big.NewInt(date.Unix() - beginDate.Unix())
// 	expTerm := big.NewInt(1)
// 	expTerm.Exp(big.NewInt(2), timePassed, big.NewInt(1))
// }