package keeper

import (
	"colinear/x/colinear-core/math"
	"colinear/x/colinear-core/memdb"
	"colinear/x/colinear-core/types"
	"log"
	"math/big"
	"time"

	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/pkg/errors"
)

func (k Keeper) AuctionIsExpired(ctx sdk.Context, auctionId string) (bool, error) {
	auction, found := k.GetAuction(ctx, auctionId)

	// make sure the auction exists on-chain
	if !found {
		return true, errors.Errorf("auction %s not found", auctionId)
	}

	return uint64(ctx.BlockHeight()) >= auction.Deadline, nil
}

func (k Keeper) FinalizeExpiredAuctions(ctx sdk.Context) {
	memdb.BidDB.ForEachAuction(func(auctionId string) error {
		auction, found := k.GetAuction(ctx, auctionId)
		// make sure the auction exists on-chain
		if !found {
			return errors.Errorf("auction %s not found", auctionId)
		}

		if uint64(ctx.BlockHeight()) >= auction.Deadline {
			var err error
			auction.Best, err = memdb.BidDB.GetLowestBid(auctionId)
			if err != nil {
				return errors.Errorf("could not get highest bid for auction %s: %s", auctionId, err)
			}

			// Remaining Unpaid: Full bid amount
			auction.Remaining = auction.Best.Amount

			// clear auction
			if err := memdb.BidDB.ClearAuction(auctionId); err != nil {
				return errors.Errorf("failed to clear auction from memcache: %s", err)
			}

			// pay out unpaid remainder to auction creator
			ceiling := new(big.Int)
			ceiling.SetString(auction.Ceiling, 10)
			lowestBidAmt := new(big.Int)
			lowestBidAmt.SetString(auction.Best.Amount, 10)
			// only pay out if there is a difference
			if ceiling.Cmp(lowestBidAmt) == 1 {
				amtRemaining := new(big.Int)
				amtRemaining.Sub(ceiling, lowestBidAmt)
				coins := sdk.NewCoins(sdk.NewCoin(
					auction.Denom,
					sdk.NewIntFromBigInt(amtRemaining),
				))
				recipAddr, err := sdk.AccAddressFromBech32(auction.Owner)
				if err != nil {
					return errors.Errorf("failed to parse address %s", auction.Owner)
				}
				if err := k.bank.SendCoinsFromModuleToAccount(ctx, types.ModuleName, recipAddr, coins); err != nil {
					log.Printf("Failed to send coins from module: %s\n", err)
					// log.Fatalf("Failed to send coins from module: %s\n", err)
				}
			}

			// lease period starts now
			auction.LeaseStart = uint64(ctx.BlockTime().Unix())

			// end auction
			k.SetAuction(ctx, auction)
		}

		return nil
	})
}

func (k *Keeper) PayAuctionAmountDue(ctx sdk.Context, auctionId string) error {
	auction, found := k.GetAuction(ctx, auctionId)
	if !found {
		return errors.Errorf("auction %s not found", auctionId)
	}

	blockTime := ctx.BlockTime()
	deadline := time.Unix(int64(auction.Deadline), 0)

	if blockTime.After(deadline) {
		return nil
	} else {
		amtTotal := new(big.Int)
		amtTotal.SetString(auction.Best.Amount, 10)
		amtRemaining := new(big.Int)
		amtTotal.SetString(auction.Remaining, 10)
		amt, err := math.CalcAmountVestableLinear(
			amtTotal,
			amtRemaining,
			ctx.BlockTime(),
			time.Unix(int64(auction.LeaseStart), 0),
			time.Unix(int64(auction.LeaseEnd), 0),
		)
		if err != nil {
			return err
		}
		coins := sdk.NewCoins(sdk.NewCoin(auction.Denom, sdk.NewIntFromBigInt(amt)))
		err = k.bank.SendCoinsFromModuleToAccount(ctx, "colinear", sdk.AccAddress(auction.Best.Owner), coins)
		return err
	}
}