package keeper

import (
	"context"
	"fmt"
	"math/big"
	"reflect"

	"cosmos-test/x/cosmostest/memdb"
	"cosmos-test/x/cosmostest/types"

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

func (k msgServer) NewBid(goCtx context.Context, msg *types.MsgNewBid) (*types.MsgNewBidResponse, error) {
	ctx := sdk.UnwrapSDKContext(goCtx)

	auction, found := k.Keeper.GetAuction(ctx, msg.AuctionIndex)
	if !found {
		return nil, fmt.Errorf("didn't find auction of index %s", msg.AuctionIndex)
	}

	auctionExpired, err := k.Keeper.AuctionIsExpired(ctx, msg.AuctionIndex)
	if err != nil {
		return nil, fmt.Errorf("error while checking auction %s expiry status: %s", msg.AuctionIndex, err)
	}
	if auctionExpired {
		return nil, fmt.Errorf("auction %s is expired", msg.AuctionIndex)
	}

	ok := false
	amt := new(big.Int)
	amt, ok = amt.SetString(msg.Amount, 10)
	if !ok {
		return nil, fmt.Errorf("failed to convert `%s` to a large integer", msg.Amount)
	}
	if amt.Sign() != 1 {
		return nil, fmt.Errorf("bid amount must be greater than 0")
	}

	addr, err := sdk.AccAddressFromBech32(msg.Creator)
	if err != nil {
		return nil, fmt.Errorf("sender address `%s` format invalid (bech32 required)", msg.Creator)
	}

	spendable := k.bank.SpendableCoins(ctx, addr)
	// if balance does not exceed or equal proposed bid amount...
	if spendable.AmountOf(auction.Denom).BigInt().Cmp(amt) == -1 {
		return nil, fmt.Errorf("not enough balance to bid %s%s", msg.Amount, auction.Denom)
	}

	lowestBid, err := memdb.BidDB.GetLowestBid(msg.AuctionIndex)
	// we manually handle KeyNotFound in GetHighestBid, so should return (nil, nil) if not found
	if err != nil {
		return nil, fmt.Errorf("failed to get lowest bid: %s", reflect.TypeOf(err))
	}

	if lowestBid != nil {
		amtPrev := new(big.Int)
		amtPrev, ok = amtPrev.SetString(lowestBid.Amount, 10)
		if !ok { // this should have been checked before, but whatever
			return nil, fmt.Errorf("failed to convert max bid (%s) to a large integer", msg.Amount)
		}

		if amt.Cmp(amtPrev) != -1 {
			return nil, fmt.Errorf("bid amount must be less than current lowest bid (%s)", amtPrev)
		}
	}

	bid := &types.Bid{
		Amount: msg.Amount,
		Owner:  msg.Creator,
	}

	if err := memdb.BidDB.AddBid(msg.AuctionIndex, bid); err != nil {
		return nil, fmt.Errorf("failed to add bid: %s", err)
	}

	// auction.Bids = append(auction.Bids, bid)
	// k.Keeper.SetAuction(ctx, auction)

	return &types.MsgNewBidResponse{}, nil
}