package auction

import (
	"fmt"

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

	"github.com/kava-labs/kava/x/auction/types"
)

// NewHandler returns a function to handle all "auction" type messages.
func NewHandler(keeper Keeper) sdk.Handler {
	return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
		ctx = ctx.WithEventManager(sdk.NewEventManager())

		switch msg := msg.(type) {
		case MsgPlaceBid:
			return handleMsgPlaceBid(ctx, keeper, msg)
		default:
			return sdk.ErrUnknownRequest(fmt.Sprintf("Unrecognized auction msg type: %T", msg)).Result()
		}
	}
}

func handleMsgPlaceBid(ctx sdk.Context, keeper Keeper, msg MsgPlaceBid) sdk.Result {

	err := keeper.PlaceBid(ctx, msg.AuctionID, msg.Bidder, msg.Amount)
	if err != nil {
		return err.Result()
	}

	ctx.EventManager().EmitEvent(
		sdk.NewEvent(
			sdk.EventTypeMessage,
			sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
			sdk.NewAttribute(sdk.AttributeKeySender, msg.Bidder.String()),
		),
	)

	return sdk.Result{
		Events: ctx.EventManager().Events(),
	}
}