package bridge

import (
	"encoding/json"

	storetypes "cosmossdk.io/store/types"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"

	"github.com/oy/openyield/x/bridge/keeper"
	"github.com/oy/openyield/x/bridge/types"
)

// module.go holds the bridge module's AppModule + RegisterServices (P1-03-01).
//
// The AppModule wraps the Keeper and registers the MsgServer via
// RegisterServices. This is the simtest-grade AppModule (D-054): the
// RegisterServices wires the hand-rolled MsgServer (no protobuf
// codegen per the skeleton's zero-codegen style). The MsgServer is
// constructed directly and exposed via the module for test wiring.
//
// The IBCModule (porttypes.IBCModule) is constructed separately by the app
// wiring (NewIBCModule wraps the Keeper); the AppModule does not register
// the IBC port binding here (that is app-wiring territory, deferred — the
// simtest wires the IBCModule directly).

// ConsensusVersion is the bridge module's consensus version (AppModule).
const ConsensusVersion = 1

// AppModule is the bridge application module (simtest-grade — D-054).
type AppModule struct {
	keeper keeper.Keeper
}

// NewAppModule constructs a new bridge AppModule.
func NewAppModule(cdc codec.Codec, storeKey storetypes.StoreKey, wk types.WatcherKeeper, bk types.BreadKeeper) AppModule {
	k := keeper.NewKeeper(cdc, storeKey, wk, bk)
	return AppModule{keeper: k}
}

// NewKeeper exposes the keeper for app wiring / IBC module construction.
func (am AppModule) NewKeeper() keeper.Keeper { return am.keeper }

// RegisterServices registers the bridge MsgServer. This is the simtest-grade
// wiring: the MsgServer is constructed from the keeper and exposed via the
// module's MsgServer method (tests use NewMsgServerImpl directly; the
// configurator path is not exercised in simtest per D-054).
func (am AppModule) RegisterServices(cfg module.Configurator) {
	// The hand-rolled MsgServer does not use the protobuf ServiceDesc
	// registration (no codegen). Tests wire the MsgServer directly via
	// keeper.NewMsgServerImpl(am.keeper). This no-op reference keeps the
	// Configurator import stable for future codegen-based wiring.
	_ = cfg
}

// MsgServer returns the bridge MsgServer for this module's keeper.
func (am AppModule) MsgServer() types.MsgServer {
	return keeper.NewMsgServerImpl(am.keeper)
}

// IBCModule returns the bridge IBCModule for this module's keeper.
func (am AppModule) IBCModule() keeper.IBCModule {
	return keeper.NewIBCModule(am.keeper)
}

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

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

// InitGenesis performs genesis initialization for the bridge module.
func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, data json.RawMessage) {
	var gs types.GenesisState
	cdc.MustUnmarshalJSON(data, &gs)
	for _, r := range gs.Routes {
		am.keeper.SetBridgeRoute(ctx, r)
	}
}

// ExportGenesis returns the exported genesis state as raw bytes.
func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage {
	routes := am.keeper.AllBridgeRoutes(ctx)
	gs := types.GenesisState{Routes: routes}
	return cdc.MustMarshalJSON(&gs)
}

// Compile-time assertion: AppModule implements module.AppModule (simtest-grade
// — the RegisterServices signature matches the interface; the full
// AppModule interface is satisfied by the methods above + the
// appmodule.AppModule methods which are not exercised in simtest per D-054).
var _ module.HasName = AppModule{}
var _ module.HasConsensusVersion = AppModule{}