package v0_16

import (
	"time"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/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"
	capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
	v039crisis "github.com/cosmos/cosmos-sdk/x/crisis/legacy/v039"
	v040crisis "github.com/cosmos/cosmos-sdk/x/crisis/legacy/v040"
	v036distr "github.com/cosmos/cosmos-sdk/x/distribution/legacy/v036"
	v038distr "github.com/cosmos/cosmos-sdk/x/distribution/legacy/v038"
	v040distr "github.com/cosmos/cosmos-sdk/x/distribution/legacy/v040"
	v038evidence "github.com/cosmos/cosmos-sdk/x/evidence/legacy/v038"
	v040evidence "github.com/cosmos/cosmos-sdk/x/evidence/legacy/v040"
	v039genutil "github.com/cosmos/cosmos-sdk/x/genutil/legacy/v039"
	v040genutil "github.com/cosmos/cosmos-sdk/x/genutil/legacy/v040"
	v043genutil "github.com/cosmos/cosmos-sdk/x/genutil/legacy/v043"
	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
	v036gov "github.com/cosmos/cosmos-sdk/x/gov/legacy/v036"
	v040gov "github.com/cosmos/cosmos-sdk/x/gov/legacy/v040"
	v039mint "github.com/cosmos/cosmos-sdk/x/mint/legacy/v039"
	v040mint "github.com/cosmos/cosmos-sdk/x/mint/legacy/v040"
	v036params "github.com/cosmos/cosmos-sdk/x/params/legacy/v036"
	v039slashing "github.com/cosmos/cosmos-sdk/x/slashing/legacy/v039"
	v040slashing "github.com/cosmos/cosmos-sdk/x/slashing/legacy/v040"
	v038staking "github.com/cosmos/cosmos-sdk/x/staking/legacy/v038"
	v040staking "github.com/cosmos/cosmos-sdk/x/staking/legacy/v040"
	v038upgrade "github.com/cosmos/cosmos-sdk/x/upgrade/legacy/v038"

	ibctransfertypes "github.com/cosmos/ibc-go/modules/apps/transfer/types"
	ibchost "github.com/cosmos/ibc-go/modules/core/24-host"
	ibctypes "github.com/cosmos/ibc-go/modules/core/types"

	"github.com/kava-labs/kava/app"
	v015kavadist "github.com/kava-labs/kava/x/kavadist/legacy/v0_15"
	v015validatorvesting "github.com/kava-labs/kava/x/validator-vesting/legacy/v0_15"
)

func migrateGenutil(oldGenState v039genutil.GenesisState) *genutiltypes.GenesisState {
	return &genutiltypes.GenesisState{
		GenTxs: oldGenState.GenTxs,
	}
}

func MigrateCosmosAppState(appState genutiltypes.AppMap, clientCtx client.Context, genesisTime time.Time) genutiltypes.AppMap {
	appState = migrateV040(appState, clientCtx, genesisTime)
	appState = migrateV043(appState, clientCtx)
	appState = addIbcGenesisStates(appState, clientCtx)
	return appState
}

func addIbcGenesisStates(appState genutiltypes.AppMap, clientCtx client.Context) genutiltypes.AppMap {
	appState[capabilitytypes.ModuleName] = clientCtx.Codec.MustMarshalJSON(capabilitytypes.DefaultGenesis())
	appState[ibchost.ModuleName] = clientCtx.Codec.MustMarshalJSON(ibctypes.DefaultGenesisState())
	appState[ibctransfertypes.ModuleName] = clientCtx.Codec.MustMarshalJSON(ibctransfertypes.DefaultGenesisState())
	return appState
}

// migrateV043 migrates cosmos modules from v0.40 to a v0.43 genesis state.
func migrateV043(appState genutiltypes.AppMap, clientCtx client.Context) genutiltypes.AppMap {
	return v043genutil.Migrate(appState, clientCtx)
}

// migrateV040 migrates cosmos modules from v0.39 to a v0.40 genesis state.
// This is based on the genutil/legacy/v40 migration logic but adapted to handle custom types from the kava module.
func migrateV040(appState genutiltypes.AppMap, clientCtx client.Context, genesisTime time.Time) genutiltypes.AppMap {
	app.SetSDKConfig()
	v039Codec := codec.NewLegacyAmino()
	v039auth.RegisterLegacyAminoCodec(v039Codec)
	v036gov.RegisterLegacyAminoCodec(v039Codec)
	v036distr.RegisterLegacyAminoCodec(v039Codec)
	v036params.RegisterLegacyAminoCodec(v039Codec)
	v038upgrade.RegisterLegacyAminoCodec(v039Codec)
	v015kavadist.RegisterLegacyAminoCodec(v039Codec)
	v015validatorvesting.RegisterLegacyAminoCodec(v039Codec)
	v039Codec.RegisterInterface((*v038evidence.Evidence)(nil), nil)

	v040Codec := clientCtx.Codec

	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)

		// Run our custom auth v40 migration on the v039 auth gen state
		appState[v040auth.ModuleName] = v040Codec.MustMarshalJSON(MigrateAuthV040(authGenState, genesisTime))
	}

	// Migrate x/crisis.
	if appState[v039crisis.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var crisisGenState v039crisis.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v039crisis.ModuleName], &crisisGenState)

		// delete deprecated x/crisis genesis state
		delete(appState, v039crisis.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040crisis.ModuleName] = v040Codec.MustMarshalJSON(v040crisis.Migrate(crisisGenState))
	}

	// Migrate x/distribution.
	if appState[v038distr.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var distributionGenState v038distr.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v038distr.ModuleName], &distributionGenState)

		// delete deprecated x/distribution genesis state
		delete(appState, v038distr.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040distr.ModuleName] = v040Codec.MustMarshalJSON(v040distr.Migrate(distributionGenState))
	}

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

	// Migrate x/gov.
	if appState[v036gov.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var govGenState v036gov.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v036gov.ModuleName], &govGenState)

		// delete deprecated x/gov genesis state
		delete(appState, v036gov.ModuleName)

		// Run our custom gov v40 migration on the v039 gov gen state
		appState[v040gov.ModuleName] = v040Codec.MustMarshalJSON(MigrateGovV040(govGenState))
	}

	// Migrate x/mint.
	if appState[v039mint.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var mintGenState v039mint.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v039mint.ModuleName], &mintGenState)

		// delete deprecated x/mint genesis state
		delete(appState, v039mint.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040mint.ModuleName] = v040Codec.MustMarshalJSON(v040mint.Migrate(mintGenState))
	}

	// 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/slashing 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))
	}

	// Migrate x/staking.
	if appState[v038staking.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var stakingGenState v038staking.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v038staking.ModuleName], &stakingGenState)

		// Update historical entries to 10000
		stakingGenState.Params.HistoricalEntries = 10000

		// delete deprecated x/staking genesis state
		delete(appState, v038staking.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040staking.ModuleName] = v040Codec.MustMarshalJSON(v040staking.Migrate(stakingGenState))
	}

	// Migrate x/genutil
	if appState[v039genutil.ModuleName] != nil {
		// unmarshal relative source genesis application state
		var genutilGenState v039genutil.GenesisState
		v039Codec.MustUnmarshalJSON(appState[v039genutil.ModuleName], &genutilGenState)

		// delete deprecated x/staking genesis state
		delete(appState, v039genutil.ModuleName)

		// Migrate relative source genesis application state and marshal it into
		// the respective key.
		appState[v040genutil.ModuleName] = v040Codec.MustMarshalJSON(migrateGenutil(genutilGenState))
	}

	return appState
}