// 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 keeper

import (
	"math/big"

	"github.com/evmos/evmos/v15/x/feemarket/types"

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

// GetParams returns the total set of fee market parameters.
func (k Keeper) GetParams(ctx sdk.Context) (params types.Params) {
	store := ctx.KVStore(k.storeKey)
	bz := store.Get(types.ParamsKey)
	if len(bz) == 0 {
		k.ss.GetParamSetIfExists(ctx, &params)
	} else {
		k.cdc.MustUnmarshal(bz, &params)
	}

	if params.MinGasPrice.IsNil() {
		params.MinGasPrice = sdk.ZeroDec()
	}

	if params.MinGasMultiplier.IsNil() {
		params.MinGasMultiplier = sdk.ZeroDec()
	}

	return
}

// SetParams sets the fee market params in a single key
func (k Keeper) SetParams(ctx sdk.Context, params types.Params) error {
	store := ctx.KVStore(k.storeKey)
	bz, err := k.cdc.Marshal(&params)
	if err != nil {
		return err
	}

	store.Set(types.ParamsKey, bz)

	return nil
}

// ----------------------------------------------------------------------------
// Parent Base Fee
// Required by EIP1559 base fee calculation.
// ----------------------------------------------------------------------------

// GetBaseFeeEnabled returns true if base fee is enabled
func (k Keeper) GetBaseFeeEnabled(ctx sdk.Context) bool {
	params := k.GetParams(ctx)
	return !params.NoBaseFee && ctx.BlockHeight() >= params.EnableHeight
}

// GetBaseFee gets the base fee from the store
func (k Keeper) GetBaseFee(ctx sdk.Context) *big.Int {
	params := k.GetParams(ctx)
	if params.NoBaseFee {
		return nil
	}

	baseFee := params.BaseFee.BigInt()
	if baseFee == nil || baseFee.Sign() == 0 {
		// try v1 format
		return k.GetBaseFeeV1(ctx)
	}
	return baseFee
}

// SetBaseFee set's the base fee in the store
func (k Keeper) SetBaseFee(ctx sdk.Context, baseFee *big.Int) {
	params := k.GetParams(ctx)
	params.BaseFee = sdk.NewIntFromBigInt(baseFee)
	err := k.SetParams(ctx, params)
	if err != nil {
		return
	}
}
