package keeper

import (
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/x/gov/exported"
	v2 "github.com/cosmos/cosmos-sdk/x/gov/migrations/v2"
	v3 "github.com/cosmos/cosmos-sdk/x/gov/migrations/v3"
	v4 "github.com/cosmos/cosmos-sdk/x/gov/migrations/v4"
)

// Migrator is a struct for handling in-place store migrations.
type Migrator struct {
	keeper         *Keeper
	legacySubspace exported.ParamSubspace
}

// NewMigrator returns a new Migrator.
func NewMigrator(keeper *Keeper, legacySubspace exported.ParamSubspace) Migrator {
	return Migrator{
		keeper:         keeper,
		legacySubspace: legacySubspace,
	}
}

// Migrate1to2 migrates from version 1 to 2.
func (m Migrator) Migrate1to2(ctx sdk.Context) error {
	return v2.MigrateStore(ctx, m.keeper.storeKey, m.keeper.cdc)
}

// Migrate2to3 migrates from version 2 to 3.
func (m Migrator) Migrate2to3(ctx sdk.Context) error {
	return v3.MigrateStore(ctx, m.keeper.storeKey, m.keeper.cdc)
}

// Migrate2to3 migrates from version 2 to 3.
func (m Migrator) Migrate3to4(ctx sdk.Context) error {
	return v4.MigrateStore(ctx, m.keeper.storeKey, m.legacySubspace, m.keeper.cdc)
}