package app

import (
	errorsmod "cosmossdk.io/errors"
	wasmkeeper "github.com/CosmWasm/wasmd/x/wasm/keeper"
	wasmtypes "github.com/CosmWasm/wasmd/x/wasm/types"
	storetypes "github.com/cosmos/cosmos-sdk/store/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
	"github.com/cosmos/cosmos-sdk/x/auth/ante"
	ibccoreante "github.com/cosmos/ibc-go/v7/modules/core/ante"
	ibckeeper "github.com/cosmos/ibc-go/v7/modules/core/keeper"
	"github.com/skip-mev/pob/mempool"
	builderante "github.com/skip-mev/pob/x/builder/ante"
	builderkeeper "github.com/skip-mev/pob/x/builder/keeper"
)

type HandlerOptions struct {
	ante.HandlerOptions
	IBCKeeper         *ibckeeper.Keeper
	WasmConfig        *wasmtypes.WasmConfig
	TXCounterStoreKey storetypes.StoreKey

	Mempool       mempool.Mempool
	TxDecoder     sdk.TxDecoder
	TxEncoder     sdk.TxEncoder
	BuilderKeeper *builderkeeper.Keeper
}

func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error) {
	if options.AccountKeeper == nil {
		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "account keeper is required for AnteHandler")
	}
	if options.BankKeeper == nil {
		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "bank keeper is required for AnteHandler")
	}
	if options.SignModeHandler == nil {
		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "sign mode handler is required for ante builder")
	}
	if options.WasmConfig == nil {
		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "wasm config is required for ante builder")
	}
	if options.TXCounterStoreKey == nil {
		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "tx counter key is required for ante builder")
	}
	var sigGasConsumer = options.SigGasConsumer
	if sigGasConsumer == nil {
		sigGasConsumer = ante.DefaultSigVerificationGasConsumer
	}

	anteDecorators := []sdk.AnteDecorator{
		ante.NewSetUpContextDecorator(),
		wasmkeeper.NewLimitSimulationGasDecorator(options.WasmConfig.SimulationGasLimit), // after setup context to enforce limits early
		wasmkeeper.NewCountTXDecorator(options.TXCounterStoreKey),
		ante.NewExtensionOptionsDecorator(options.ExtensionOptionChecker),
		ante.NewValidateBasicDecorator(),
		ante.NewTxTimeoutHeightDecorator(),
		ante.NewValidateMemoDecorator(options.AccountKeeper),
		ante.NewConsumeGasForTxSizeDecorator(options.AccountKeeper),
		ante.NewDeductFeeDecorator(options.AccountKeeper, options.BankKeeper, options.FeegrantKeeper, options.TxFeeChecker),
		// SetPubKeyDecorator must be called before all signature verification decorators
		ante.NewSetPubKeyDecorator(options.AccountKeeper),
		ante.NewValidateSigCountDecorator(options.AccountKeeper),
		ante.NewSigGasConsumeDecorator(options.AccountKeeper, sigGasConsumer),
		ante.NewSigVerificationDecorator(options.AccountKeeper, options.SignModeHandler),
		ante.NewIncrementSequenceDecorator(options.AccountKeeper),
		ibccoreante.NewRedundantRelayDecorator(options.IBCKeeper),
		builderante.NewBuilderDecorator(*options.BuilderKeeper, options.TxEncoder, options.Mempool),
	}

	return sdk.ChainAnteDecorators(anteDecorators...), nil
}