package v040

import (
	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	cryptocodec "github.com/cosmos/cosmos-sdk/crypto/codec"
	v039auth "github.com/cosmos/cosmos-sdk/x/auth/legacy/v039"
	v040auth "github.com/cosmos/cosmos-sdk/x/auth/legacy/v040"
	v036supply "github.com/cosmos/cosmos-sdk/x/bank/legacy/v036"
	v038bank "github.com/cosmos/cosmos-sdk/x/bank/legacy/v038"
	v040bank "github.com/cosmos/cosmos-sdk/x/bank/legacy/v040"
	v038evidence "github.com/cosmos/cosmos-sdk/x/evidence/legacy/v038"
	v040evidence "github.com/cosmos/cosmos-sdk/x/evidence/legacy/v040"
	"github.com/cosmos/cosmos-sdk/x/genutil/types"
	v039slashing "github.com/cosmos/cosmos-sdk/x/slashing/legacy/v039"
	v040slashing "github.com/cosmos/cosmos-sdk/x/slashing/legacy/v040"
)

// Migrate migrates exported state from v0.39 to a v0.40 genesis state.
func Migrate(appState types.AppMap, clientCtx client.Context) types.AppMap {
	v039Codec := codec.NewLegacyAmino()
	cryptocodec.RegisterCrypto(v039Codec)
	v039auth.RegisterLegacyAminoCodec(v039Codec)

	v040Codec := clientCtx.JSONMarshaler

	if appState[v038bank.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var bankGenState v038bank.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v038bank.ModuleName], &bankGenState)

		// unmarshal x/auth genesis state to retrieve all account balances
		var authGenState v039auth.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v039auth.ModuleName], &authGenState)

		// unmarshal x/supply genesis state to retrieve total supply
		var supplyGenState v036supply.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v036supply.ModuleName], &supplyGenState)

		// delete deprecated x/bank genesis state
		delete(appState, v038bank.ModuleName)

		// delete deprecated x/supply genesis state
		delete(appState, v036supply.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040bank.ModuleName] = v040Codec.MustMarshalJSON(v040bank.Migrate(bankGenState, authGenState, supplyGenState))
	}

	// remove balances from existing accounts
	if appState[v039auth.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var authGenState v039auth.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v039auth.ModuleName], &authGenState)

		// delete deprecated x/auth genesis state
		delete(appState, v039auth.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040auth.ModuleName] = v040Codec.MustMarshalJSON(v040auth.Migrate(authGenState))
	}

	// Migrate x/evidence.
	if appState[v038evidence.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var evidenceGenState v038evidence.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v038bank.ModuleName], &evidenceGenState)

		// delete deprecated x/evidence genesis state
		delete(appState, v038evidence.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040evidence.ModuleName] = v040Codec.MustMarshalJSON(v040evidence.Migrate(evidenceGenState, clientCtx))
	}

	// Migrate x/slashing.
	if appState[v039slashing.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var slashingGenState v039slashing.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v039slashing.ModuleName], &slashingGenState)

		// delete deprecated x/evidence genesis state
		delete(appState, v039slashing.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040slashing.ModuleName] = v040Codec.MustMarshalJSON(v040slashing.Migrate(slashingGenState))
	}

	return appState
}