package app

import (
	"fmt"

	"github.com/cosmos/cosmos-sdk/baseapp"
	storetypes "github.com/cosmos/cosmos-sdk/store/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	consensustypes "github.com/cosmos/cosmos-sdk/x/consensus/types"
	crisistypes "github.com/cosmos/cosmos-sdk/x/crisis/types"
	distrtypes "github.com/cosmos/cosmos-sdk/x/distribution/types"
	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
	govv1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1"
	minttypes "github.com/cosmos/cosmos-sdk/x/mint/types"
	paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
	packetforwardtypes "github.com/cosmos/ibc-apps/middleware/packet-forward-middleware/v7/packetforward/types"
	ibctransfertypes "github.com/cosmos/ibc-go/v7/modules/apps/transfer/types"
	ibctmmigrations "github.com/cosmos/ibc-go/v7/modules/light-clients/07-tendermint/migrations"
)

const (
	UpgradeName_Mainnet = "v0.26.0"
	UpgradeName_Testnet = "v0.26.0-alpha.0"
)

// RegisterUpgradeHandlers registers the upgrade handlers for the app.
func (app App) RegisterUpgradeHandlers() {
	app.upgradeKeeper.SetUpgradeHandler(
		UpgradeName_Mainnet,
		upgradeHandler(app, UpgradeName_Mainnet),
	)
	app.upgradeKeeper.SetUpgradeHandler(
		UpgradeName_Testnet,
		upgradeHandler(app, UpgradeName_Testnet),
	)

	upgradeInfo, err := app.upgradeKeeper.ReadUpgradeInfoFromDisk()
	if err != nil {
		panic(err)
	}

	doUpgrade := upgradeInfo.Name == UpgradeName_Mainnet ||
		upgradeInfo.Name == UpgradeName_Testnet

	if doUpgrade && !app.upgradeKeeper.IsSkipHeight(upgradeInfo.Height) {
		storeUpgrades := storetypes.StoreUpgrades{
			Added: []string{
				crisistypes.ModuleName,
				consensustypes.ModuleName,
				packetforwardtypes.ModuleName,
			},
		}

		// configure store loader that checks if version == upgradeHeight and applies store upgrades
		app.SetStoreLoader(upgradetypes.UpgradeStoreLoader(upgradeInfo.Height, &storeUpgrades))
	}
}

// upgradeHandler returns an UpgradeHandler for the given upgrade parameters.
func upgradeHandler(
	app App,
	name string,
) upgradetypes.UpgradeHandler {
	return func(
		ctx sdk.Context,
		plan upgradetypes.Plan,
		fromVM module.VersionMap,
	) (module.VersionMap, error) {
		app.Logger().Info(fmt.Sprintf("running %s upgrade handler", name))

		baseAppLegacySS := app.paramsKeeper.Subspace(baseapp.Paramspace).WithKeyTable(paramstypes.ConsensusParamsKeyTable())

		// Set param key table for params module migration
		for _, subspace := range app.paramsKeeper.GetSubspaces() {
			subspace := subspace
			var keyTable paramstypes.KeyTable
			switch subspace.Name() {
			// sdk
			case authtypes.ModuleName:
				keyTable = authtypes.ParamKeyTable() //nolint:staticcheck
			case banktypes.ModuleName:
				keyTable = banktypes.ParamKeyTable() //nolint:staticcheck,nolintlint
			case stakingtypes.ModuleName:
				keyTable = stakingtypes.ParamKeyTable()
			case minttypes.ModuleName:
				keyTable = minttypes.ParamKeyTable() //nolint:staticcheck
			case distrtypes.ModuleName:
				keyTable = distrtypes.ParamKeyTable() //nolint:staticcheck,nolintlint
			case slashingtypes.ModuleName:
				keyTable = slashingtypes.ParamKeyTable() //nolint:staticcheck
			case govtypes.ModuleName:
				keyTable = govv1.ParamKeyTable() //nolint:staticcheck
			case crisistypes.ModuleName:
				keyTable = crisistypes.ParamKeyTable() //nolint:staticcheck

			// ibc
			case ibctransfertypes.ModuleName:
				keyTable = ibctransfertypes.ParamKeyTable() //nolint:staticcheck

			default:
				continue
			}
			if !subspace.HasKeyTable() {
				subspace.WithKeyTable(keyTable)
			}
		}

		// optional migration: prune expired tendermint consensus states to save storage space
		// see https://github.com/cosmos/ibc-go/blob/v7.2.0/docs/migrations/v6-to-v7.md#chains
		if _, err := ibctmmigrations.PruneExpiredConsensusStates(ctx, app.appCodec, app.ibcKeeper.ClientKeeper); err != nil {
			return nil, err
		}

		// migrate tendermint consensus parameters from x/params module to a
		// dedicated x/consensus module.
		baseapp.MigrateParams(ctx, baseAppLegacySS, &app.consensusParamsKeeper)

		return app.mm.RunMigrations(ctx, app.configurator, fromVM)
	}
}