package mukan

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

	"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"
	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"google.golang.org/grpc"

	"mukan/x/mukan/keeper"
	"mukan/x/mukan/types"
)

var (
	_ module.AppModuleBasic = (*AppModule)(nil)
	_ module.AppModule      = (*AppModule)(nil)
	_ module.HasGenesis     = (*AppModule)(nil)

	_ appmodule.AppModule       = (*AppModule)(nil)
	_ appmodule.HasBeginBlocker = (*AppModule)(nil)
	_ appmodule.HasEndBlocker   = (*AppModule)(nil)
)

// AppModule implements the AppModule interface that defines the inter-dependent methods that modules need to implement
type AppModule struct {
	cdc        codec.Codec
	keeper     keeper.Keeper
	authKeeper types.AuthKeeper
	bankKeeper types.BankKeeper
}

func NewAppModule(
	cdc codec.Codec,
	keeper keeper.Keeper,
	authKeeper types.AuthKeeper,
	bankKeeper types.BankKeeper,
) AppModule {
	return AppModule{
		cdc:        cdc,
		keeper:     keeper,
		authKeeper: authKeeper,
		bankKeeper: bankKeeper,
	}
}

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

// Name returns the name of the module as a string.
func (AppModule) Name() string {
	return types.ModuleName
}

// RegisterLegacyAminoCodec registers the amino codec
func (AppModule) RegisterLegacyAminoCodec(*codec.LegacyAmino) {}

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

// RegisterInterfaces registers a module's interface types and their concrete implementations as proto.Message.
func (AppModule) RegisterInterfaces(registrar codectypes.InterfaceRegistry) {
	types.RegisterInterfaces(registrar)
}

// RegisterServices registers a gRPC query service to respond to the module-specific gRPC queries
func (am AppModule) RegisterServices(registrar grpc.ServiceRegistrar) error {
	types.RegisterMsgServer(registrar, keeper.NewMsgServerImpl(am.keeper))
	types.RegisterQueryServer(registrar, keeper.NewQueryServerImpl(am.keeper))

	return nil
}

// DefaultGenesis returns a default GenesisState for the module, marshalled to json.RawMessage.
// The default GenesisState need to be defined by the module developer and is primarily used for testing.
func (am AppModule) DefaultGenesis(codec.JSONCodec) json.RawMessage {
	return am.cdc.MustMarshalJSON(types.DefaultGenesis())
}

// ValidateGenesis used to validate the GenesisState, given in its json.RawMessage form.
func (am AppModule) ValidateGenesis(_ codec.JSONCodec, _ client.TxEncodingConfig, bz json.RawMessage) error {
	var genState types.GenesisState
	if err := am.cdc.UnmarshalJSON(bz, &genState); err != nil {
		return fmt.Errorf("failed to unmarshal %s genesis state: %w", types.ModuleName, err)
	}

	return genState.Validate()
}

// InitGenesis performs the module's genesis initialization. It returns no validator updates.
func (am AppModule) InitGenesis(ctx sdk.Context, _ codec.JSONCodec, gs json.RawMessage) {
	var genState types.GenesisState
	// Initialize global index to index in genesis state
	if err := am.cdc.UnmarshalJSON(gs, &genState); err != nil {
		panic(fmt.Errorf("failed to unmarshal %s genesis state: %w", types.ModuleName, err))
	}

	if err := am.keeper.InitGenesis(ctx, genState); err != nil {
		panic(fmt.Errorf("failed to initialize %s genesis state: %w", types.ModuleName, err))
	}
}

// ExportGenesis returns the module's exported genesis state as raw JSON bytes.
func (am AppModule) ExportGenesis(ctx sdk.Context, _ codec.JSONCodec) json.RawMessage {
	genState, err := am.keeper.ExportGenesis(ctx)
	if err != nil {
		panic(fmt.Errorf("failed to export %s genesis state: %w", types.ModuleName, err))
	}

	bz, err := am.cdc.MarshalJSON(genState)
	if err != nil {
		panic(fmt.Errorf("failed to marshal %s genesis state: %w", types.ModuleName, err))
	}

	return bz
}

// ConsensusVersion is a sequence number for state-breaking change of the module.
// It should be incremented on each consensus-breaking change introduced by the module.
// To avoid wrong/empty versions, the initial version should be set to 1.
func (AppModule) ConsensusVersion() uint64 { return 1 }

// BeginBlock contains the logic that is automatically triggered at the beginning of each block.
// The begin block implementation is optional.
func (am AppModule) BeginBlock(_ context.Context) error {
	return nil
}

// EndBlock contains the logic that is automatically triggered at the end of each block.
// The end block implementation is optional.
func (am AppModule) EndBlock(_ context.Context) error {
	return nil
}