package keeper

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

	"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)
	}

	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")
	}

	amtPrev := big.NewInt(0)
	if len(auction.Bids) > 0 {
		// shouldn't need to check validity, because we assume it's checked
		// before approving & inserting the bid
		latestBid := auction.Bids[len(auction.Bids)-1]
		amtPrev, _ = amtPrev.SetString(latestBid.Amount, 10)
	}

	if amt.Cmp(amtPrev) < 1 {
		return nil, fmt.Errorf("bid amount must be greater than largest bid")
	}

	bid := &types.Bid{
		Amount: msg.Amount,
		Owner:  msg.Creator,
	}
	auction.Bids = append(auction.Bids, bid)

	k.Keeper.SetAuction(ctx, auction)

	return &types.MsgNewBidResponse{}, nil
}