package incentive

import (
	sdk "github.com/cosmos/cosmos-sdk/types"
	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"

	"github.com/kava-labs/kava/x/incentive/keeper"
	"github.com/kava-labs/kava/x/incentive/types"
)

// NewHandler creates an sdk.Handler for incentive module messages
func NewHandler(k keeper.Keeper) sdk.Handler {
	return func(ctx sdk.Context, msg sdk.Msg) (*sdk.Result, error) {
		ctx = ctx.WithEventManager(sdk.NewEventManager())
		switch msg := msg.(type) {
		case types.MsgClaimReward:
			return handleMsgClaimReward(ctx, k, msg)
		default:
			return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unrecognized %s message type: %T", ModuleName, msg)

		}
	}
}

func handleMsgClaimReward(ctx sdk.Context, k keeper.Keeper, msg types.MsgClaimReward) (*sdk.Result, error) {

	claims, found := k.GetClaimsByAddressAndDenom(ctx, msg.Sender, msg.Denom)
	if !found {
		return nil, sdkerrors.Wrapf(types.ErrNoClaimsFound, "address: %s, denom: %s", msg.Sender, msg.Denom)
	}

	for _, claim := range claims {
		err := k.PayoutClaim(ctx, claim.Owner, claim.Denom, claim.ClaimPeriodID)
		if err != nil {
			return nil, err
		}
	}
	ctx.EventManager().EmitEvent(
		sdk.NewEvent(
			sdk.EventTypeMessage,
			sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
			sdk.NewAttribute(sdk.AttributeKeySender, msg.Sender.String()),
		),
	)

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