# types

import "github.com/matzefriedrich/parsley/pkg/types"

const (
    ErrorRequiresFunctionValue               = "the given value is not function"
    ErrorCannotRegisterModule                = "failed to register module"
    ErrorTypeAlreadyRegistered               = "type already registered"
    ErrorServiceAlreadyLinkedWithAnotherList = "service already linked with another list"
    ErrorFailedToRegisterType                = "failed to register type"
)

const (
    ErrorServiceTypeNotRegistered               = "service type is not registered"
    ErrorRequiredServiceNotRegistered           = "required service type is not registered"
    ErrorCannotResolveService                   = "cannot resolve service"
    ErrorAmbiguousServiceInstancesResolved      = "the resolve operation resulted in multiple service instances"
    ErrorActivatorFunctionInvalidReturnType     = "activator function has an invalid return type"
    ErrorCircularDependencyDetected             = "circular dependency detected"
    ErrorCannotBuildDependencyGraph             = "failed to build dependency graph"
    ErrorInstanceCannotBeNil                    = "instance cannot be nil"
    ErrorServiceTypeMustBeInterface             = "service type must be an interface"
    ErrorCannotRegisterTypeWithResolverOptions  = "cannot register type with resolver options"
    ErrorCannotCreateInstanceOfUnregisteredType = "failed to create instance of unregistered type"
)

const (
    ErrorInstanceAlreadySet = "instance already set"
)

var (

    // ErrRequiresFunctionValue indicates that the provided value is not a function.
    ErrRequiresFunctionValue = errors.New(ErrorRequiresFunctionValue)

    // ErrCannotRegisterModule indicates that the module registration process has failed.
    ErrCannotRegisterModule = errors.New(ErrorCannotRegisterModule)

    // ErrTypeAlreadyRegistered indicates that an attempt was made to register a type that is already registered.
    ErrTypeAlreadyRegistered = errors.New(ErrorTypeAlreadyRegistered)

    // ErrFailedToRegisterType indicates that the attempt to register a type has failed.
    ErrFailedToRegisterType = errors.New(ErrorFailedToRegisterType)
)

var (

    // ErrServiceTypeNotRegistered is returned when attempting to resolve a service type that has not been registered.
    ErrServiceTypeNotRegistered = errors.New(ErrorServiceTypeNotRegistered)

    // ErrRequiredServiceNotRegistered is returned when a required service type is not registered.
    ErrRequiredServiceNotRegistered = errors.New(ErrorRequiredServiceNotRegistered)

    // ErrActivatorFunctionInvalidReturnType is returned when an activator function has an invalid return type.
    ErrActivatorFunctionInvalidReturnType = errors.New(ErrorCannotResolveService)

    // ErrCannotBuildDependencyGraph is returned when the resolver fails to build a dependency graph due to missing dependencies or other issues.
    ErrCannotBuildDependencyGraph = errors.New(ErrorCannotBuildDependencyGraph)

    // ErrCircularDependencyDetected is returned when a circular dependency is detected during the resolution process.
    ErrCircularDependencyDetected = errors.New(ErrorCircularDependencyDetected)

    // ErrInstanceCannotBeNil is returned when an instance provided is nil, but a non-nil value is required.
    ErrInstanceCannotBeNil = errors.New(ErrorInstanceCannotBeNil)

    // ErrServiceTypeMustBeInterface is returned when a service type is not an interface.
    ErrServiceTypeMustBeInterface = errors.New(ErrorServiceTypeMustBeInterface)

    // ErrCannotRegisterTypeWithResolverOptions is returned when the resolver failed to register a type via resolver options.
    ErrCannotRegisterTypeWithResolverOptions = errors.New(ErrorCannotRegisterTypeWithResolverOptions)

    // ErrCannotCreateInstanceOfUnregisteredType is returned when the resolver fails to instantiate a type that has not been registered.
    ErrCannotCreateInstanceOfUnregisteredType = errors.New(ErrorCannotCreateInstanceOfUnregisteredType)
)

var (
    // ErrInstanceAlreadySet is returned when there is an attempt to set an instance that is already set.
    ErrInstanceAlreadySet = errors.New(ErrorInstanceAlreadySet)
)

func NewDependencyError(msg string) error

func NewReflectionError(msg string, initializers ...ParsleyErrorFunc) error

func NewRegistryError(msg string, initializers ...ParsleyErrorFunc) error

func NewResolverError(msg string, initializers ...ParsleyErrorFunc) error

type DependencyError struct {
    ParsleyError
}

type DependencyInfo interface {
    // AddRequiredServiceInfo adds a child dependency to the current dependency info.
    AddRequiredServiceInfo(child DependencyInfo)

    // CreateInstance creates an instance of the service associated with this dependency info.
    CreateInstance() (interface{}, error)

    // Consumer returns the parent dependency for the current dependency info.
    Consumer() DependencyInfo

    // HasInstance checks if an instance has already been created for the dependency represented by the current DependencyInfo object.
    HasInstance() bool

    // Instance retrieves the created instance of the service associated with this dependency info.
    Instance() interface{}

    // Registration gets the service registration of the current dependency info.
    Registration() ServiceRegistration

    // RequiredServiceTypes gets the service types required by this dependency info.
    RequiredServiceTypes() []ServiceType

    // RequiredServices retrieves the instances of services required by this dependency info.
    RequiredServices() ([]interface{}, error)

    // ServiceTypeName gets the name of the service type associated with this dependency info.
    ServiceTypeName() string

    // SetInstance sets the instance for the current dependency info.
    SetInstance(instance interface{}) error
}

type FunctionInfo interface {
    fmt.Stringer
    Name() string
    Parameters() []FunctionParameterInfo
    ReturnType() ServiceType
    ParameterTypes() []ServiceType
}

type FunctionParameterInfo interface {
    fmt.Stringer
    Type() ServiceType
}

type LifetimeScope uint

const (

    // LifetimeTransient represents a transient lifetime where a new instance is created each time it is requested.
    LifetimeTransient LifetimeScope = iota

    // LifetimeScoped represents a scoped lifetime where a single instance is created per scope.
    LifetimeScoped

    // LifetimeSingleton represents a single instance scope that persists for the lifetime of the application.
    LifetimeSingleton
)

type ModuleFunc func(registry ServiceRegistry) error

type NamedService[T any] interface {
    Name() string
    ActivatorFunc() any
}

type ParsleyAggregateError struct {
    Msg string
    // contains filtered or unexported fields
}

func (f ParsleyAggregateError) Error() string

func (f ParsleyAggregateError) Errors() []error

func (f ParsleyAggregateError) Is(err error) bool

type ParsleyError struct {
    Msg string
    // contains filtered or unexported fields
}

func (f ParsleyError) Error() string

func (f ParsleyError) Is(err error) bool

func (f ParsleyError) Unwrap() error

type ParsleyErrorFunc func(e error)

func ForServiceType(serviceType string) ParsleyErrorFunc

func WithAggregatedCause(errs ...error) ParsleyErrorFunc

func WithCause(err error) ParsleyErrorFunc

type ParsleyErrorWithServiceTypeName interface {
    ServiceTypeName(name string)
}

type ReflectionError struct {
    ParsleyError
}

type RegistryError struct {
    ParsleyError
    // contains filtered or unexported fields
}

func (r *RegistryError) MatchesServiceType(name string) bool

func (r *RegistryError) ServiceTypeName(name string)

type Resolver interface {

    // Resolve attempts to resolve all registered services of the specified ServiceType.
    Resolve(ctx context.Context, serviceType ServiceType) ([]interface{}, error)

    // ResolveWithOptions resolves services of the specified type using additional options and returns a list of resolved services or an error.
    ResolveWithOptions(ctx context.Context, serviceType ServiceType, options ...ResolverOptionsFunc) ([]interface{}, error)
}

type ResolverError struct {
    ParsleyError
    // contains filtered or unexported fields
}

func (r *ResolverError) ServiceTypeName(name string)

type ResolverOptionsFunc func(registry ServiceRegistry) error

type ServiceKey struct {
    // contains filtered or unexported fields
}

func NewServiceKey(value string) ServiceKey

func (s ServiceKey) String() string

type ServiceRegistration interface {

    // Id Returns the unique identifier of the service registration.
    Id() uint64

    // InvokeActivator calls the activator function with the provided parameters and returns the resulting instance and any error.
    InvokeActivator(params ...interface{}) (interface{}, error)

    // IsSame checks if the provided ServiceRegistration equals the current ServiceRegistration.
    IsSame(other ServiceRegistration) bool

    // LifetimeScope returns the LifetimeScope associated with the service registration.
    LifetimeScope() LifetimeScope

    // RequiredServiceTypes returns a slice of ServiceType, containing all service types required by the service registration.
    RequiredServiceTypes() []ServiceType

    // ServiceType retrieves the type of the service being registered.
    ServiceType() ServiceType
}

type ServiceRegistrationList interface {

    // AddRegistration adds a new service registration to the list.
    AddRegistration(registration ServiceRegistrationSetup) error

    // Id returns the unique identifier of the service registration list.
    Id() uint64

    // Registrations returns a slice of ServiceRegistration, containing all registrations in the list.
    Registrations() []ServiceRegistration

    // IsEmpty checks if the service registration list contains any registrations.
    // It returns true if the list is empty, otherwise false.
    IsEmpty() bool
}

type ServiceRegistrationSetup interface {
    ServiceRegistration

    // SetId sets the unique identifier for the service registration. This method supports internal infrastructure and is not intended to be used by your code.
    SetId(id uint64) error
}

type ServiceRegistry interface {
    ServiceRegistryAccessor

    // CreateLinkedRegistry creates and returns a new ServiceRegistry instance linked to the current registry. A linked service registry is an empty service registry.
    CreateLinkedRegistry() ServiceRegistry

    // CreateScope creates and returns a scoped ServiceRegistry instance which inherits all service registrations from the current ServiceRegistry instance.
    CreateScope() ServiceRegistry

    // GetServiceRegistrations retrieves all service registrations.
    GetServiceRegistrations() ([]ServiceRegistration, error)

    // IsRegistered checks if a service of the specified ServiceType is registered in the service registry.
    IsRegistered(serviceType ServiceType) bool

    // Register registers a service with its activator function and defines its lifetime scope with the service registry.
    Register(activatorFunc any, scope LifetimeScope) error

    // RegisterModule registers one or more modules, encapsulated as ModuleFunc, with the service registry. A module is a logical unit of service registrations.
    RegisterModule(modules ...ModuleFunc) error
}

type ServiceRegistryAccessor interface {

    // TryGetServiceRegistrations attempts to retrieve all service registrations for the given service type.
    // Returns the service registration list and true if found, otherwise returns false.
    TryGetServiceRegistrations(serviceType ServiceType) (ServiceRegistrationList, bool)

    // TryGetSingleServiceRegistration attempts to retrieve a single service registration for the given service type.
    // Returns the service registration and true if found, otherwise returns false.
    TryGetSingleServiceRegistration(serviceType ServiceType) (ServiceRegistration, bool)
}

type ServiceType interface {

    // Name returns the name of the service type.
    Name() string

    // PackagePath returns the package path of the service type.
    PackagePath() string

    // ReflectedType returns the underlying reflect.Type representation of the service type.
    ReflectedType() reflect.Type

    // LookupKey retrieves the ServiceKey associated with the service type.
    LookupKey() ServiceKey
}

func MakeServiceType[T any]() ServiceType

func ServiceTypeFrom(t reflect.Type) ServiceType