// Copyright 2022 Evmos Foundation
// This file is part of the Evmos Network packages.
//
// Evmos is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Evmos packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Evmos packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE

package incentives

import (
	"strconv"

	errorsmod "cosmossdk.io/errors"
	errortypes "github.com/cosmos/cosmos-sdk/types/errors"

	sdk "github.com/cosmos/cosmos-sdk/types"
	govv1beta1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
	"github.com/ethereum/go-ethereum/common"

	"github.com/evmos/evmos/v15/x/incentives/keeper"
	"github.com/evmos/evmos/v15/x/incentives/types"
)

// NewIncentivesProposalHandler creates a governance handler to manage new
// proposal types.
func NewIncentivesProposalHandler(k *keeper.Keeper) govv1beta1.Handler {
	return func(ctx sdk.Context, content govv1beta1.Content) error {
		switch c := content.(type) {
		case *types.RegisterIncentiveProposal:
			return handleRegisterIncentiveProposal(ctx, k, c)
		case *types.CancelIncentiveProposal:
			return handleCancelIncentiveProposal(ctx, k, c)
		default:
			return errorsmod.Wrapf(
				errortypes.ErrUnknownRequest,
				"unrecognized %s proposal content type: %T", types.ModuleName, c,
			)
		}
	}
}

func handleRegisterIncentiveProposal(ctx sdk.Context, k *keeper.Keeper, p *types.RegisterIncentiveProposal) error {
	in, err := k.RegisterIncentive(ctx, common.HexToAddress(p.Contract), p.Allocations, p.Epochs)
	if err != nil {
		return err
	}
	ctx.EventManager().EmitEvent(
		sdk.NewEvent(
			types.EventTypeRegisterIncentive,
			sdk.NewAttribute(types.AttributeKeyContract, in.Contract),
			sdk.NewAttribute(
				types.AttributeKeyEpochs,
				strconv.FormatUint(uint64(in.Epochs), 10),
			),
		),
	)
	return nil
}

func handleCancelIncentiveProposal(ctx sdk.Context, k *keeper.Keeper, p *types.CancelIncentiveProposal) error {
	err := k.CancelIncentive(ctx, common.HexToAddress(p.Contract))
	if err != nil {
		return err
	}
	ctx.EventManager().EmitEvent(
		sdk.NewEvent(
			types.EventTypeCancelIncentive,
			sdk.NewAttribute(types.AttributeKeyContract, p.Contract),
		),
	)
	return nil
}
