package wasm

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/spf13/cobra"

	"cosmossdk.io/core/appmodule"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
	"github.com/cosmos/cosmos-sdk/x/gov/simulation"

	"github.com/cosmos/ibc-go/modules/light-clients/08-wasm/v10/client/cli"
	"github.com/cosmos/ibc-go/modules/light-clients/08-wasm/v10/keeper"
	"github.com/cosmos/ibc-go/modules/light-clients/08-wasm/v10/types"
)

var (
	_ module.AppModule           = (*AppModule)(nil)
	_ module.AppModuleBasic      = (*AppModule)(nil)
	_ module.HasProposalMsgs     = (*AppModule)(nil)
	_ module.HasGenesis          = (*AppModule)(nil)
	_ module.HasName             = (*AppModule)(nil)
	_ module.HasConsensusVersion = (*AppModule)(nil)
	_ module.HasServices         = (*AppModule)(nil)
	_ appmodule.AppModule        = (*AppModule)(nil)
)

// IsOnePerModuleType implements the depinject.OnePerModuleType interface.
func (AppModule) IsOnePerModuleType() {}

// IsAppModule implements the appmodule.AppModule interface.
func (AppModule) IsAppModule() {}

// AppModuleBasic defines the basic application module used by the Wasm light client.
// Only the RegisterInterfaces function needs to be implemented. All other function perform
// a no-op.
type AppModuleBasic struct{}

// Name returns the tendermint module name.
func (AppModuleBasic) Name() string {
	return types.ModuleName
}

// RegisterLegacyAminoCodec performs a no-op. The Wasm client does not support amino.
func (AppModuleBasic) RegisterLegacyAminoCodec(*codec.LegacyAmino) {}

// RegisterInterfaces registers module concrete types into protobuf Any. This allows core IBC
// to unmarshal Wasm light client types.
func (AppModuleBasic) RegisterInterfaces(registry codectypes.InterfaceRegistry) {
	types.RegisterInterfaces(registry)
}

// DefaultGenesis returns an empty state, i.e. no contracts
func (AppModuleBasic) DefaultGenesis(cdc codec.JSONCodec) json.RawMessage {
	return cdc.MustMarshalJSON(&types.GenesisState{
		Contracts: []types.Contract{},
	})
}

// ValidateGenesis performs a no-op.
func (AppModuleBasic) ValidateGenesis(cdc codec.JSONCodec, _ client.TxEncodingConfig, bz json.RawMessage) error {
	var gs types.GenesisState
	if err := cdc.UnmarshalJSON(bz, &gs); err != nil {
		return fmt.Errorf("failed to unmarshal %s genesis state: %w", types.ModuleName, err)
	}

	return gs.Validate()
}

// RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for Wasm client module.
func (AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx client.Context, mux *runtime.ServeMux) {
	err := types.RegisterQueryHandlerClient(context.Background(), mux, types.NewQueryClient(clientCtx))
	if err != nil {
		panic(err)
	}
}

// GetTxCmd implements AppModuleBasic interface
func (AppModuleBasic) GetTxCmd() *cobra.Command {
	return cli.NewTxCmd()
}

// GetQueryCmd implements AppModuleBasic interface
func (AppModuleBasic) GetQueryCmd() *cobra.Command {
	return cli.GetQueryCmd()
}

// AppModule represents the AppModule for this module
type AppModule struct {
	AppModuleBasic
	keeper keeper.Keeper
}

// NewAppModule creates a new 08-wasm module
func NewAppModule(k keeper.Keeper) AppModule {
	return AppModule{
		keeper: k,
	}
}

// RegisterServices registers module services.
func (am AppModule) RegisterServices(cfg module.Configurator) {
	types.RegisterMsgServer(cfg.MsgServer(), am.keeper)
	types.RegisterQueryServer(cfg.QueryServer(), am.keeper)

	wasmMigrator := keeper.NewMigrator(am.keeper)
	if err := cfg.RegisterMigration(types.ModuleName, 1, wasmMigrator.MigrateChecksums); err != nil {
		panic(fmt.Errorf("failed to migrate 08-wasm module from version 1 to 2 (checksums migration to collections): %v", err))
	}
}

// ConsensusVersion implements AppModule/ConsensusVersion.
func (AppModule) ConsensusVersion() uint64 { return 2 }

// ProposalMsgs returns msgs used for governance proposals for simulations.
func (AppModule) ProposalMsgs(simState module.SimulationState) []simtypes.WeightedProposalMsg {
	return simulation.ProposalMsgs()
}

func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, bz json.RawMessage) {
	var gs types.GenesisState
	err := cdc.UnmarshalJSON(bz, &gs)
	if err != nil {
		panic(fmt.Errorf("failed to unmarshal %s genesis state: %s", am.Name(), err))
	}
	err = am.keeper.InitGenesis(ctx, gs)
	if err != nil {
		panic(err)
	}
}

func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage {
	gs := am.keeper.ExportGenesis(ctx)
	return cdc.MustMarshalJSON(&gs)
}