package repo

import (
	"errors"
	"sort"
	"sync"

	"browser.local/platform/domain"
)

var (
	ErrDuplicate = errors.New("resource already exists")
	ErrNotFound  = errors.New("resource not found")
)

type UserRepository interface {
	Create(domain.User) error
	Get(id string) (domain.User, error)
	List(domain.UserFilter) ([]domain.User, error)
	Update(domain.User) error
}

type AIProviderRepository interface {
	Create(domain.AIProvider) error
	Get(id string) (domain.AIProvider, error)
	List(domain.AIProviderFilter) ([]domain.AIProvider, error)
	Update(domain.AIProvider) error
}

type GamePluginRepository interface {
	Create(domain.GamePlugin) error
	Get(id string) (domain.GamePlugin, error)
	List(domain.GamePluginFilter) ([]domain.GamePlugin, error)
	Update(domain.GamePlugin) error
}

type ServerInstanceRepository interface {
	Create(domain.ServerInstance) error
	Get(id string) (domain.ServerInstance, error)
	List(domain.ServerInstanceFilter) ([]domain.ServerInstance, error)
	Update(domain.ServerInstance) error
}

type RunEndpointRepository interface {
	Create(domain.RunEndpoint) error
	Get(id string) (domain.RunEndpoint, error)
	List(domain.RunEndpointFilter) ([]domain.RunEndpoint, error)
	Update(domain.RunEndpoint) error
}

type JobRepository interface {
	Create(domain.Job) error
	Get(id string) (domain.Job, error)
	GetByIdempotency(runEndpointID string, idempotencyKey string) (domain.Job, error)
	List(domain.JobFilter) ([]domain.Job, error)
	Update(domain.Job) error
}

type ArtifactRepository interface {
	Create(domain.Artifact) error
	Get(id string) (domain.Artifact, error)
	List(domain.ArtifactFilter) ([]domain.Artifact, error)
	Update(domain.Artifact) error
}

type RuntimeBindingRepository interface {
	Create(domain.RuntimeBinding) error
	Get(id string) (domain.RuntimeBinding, error)
	List(domain.RuntimeBindingFilter) ([]domain.RuntimeBinding, error)
	Update(domain.RuntimeBinding) error
}

type EncryptedComponentKeyRepository interface {
	Create(domain.EncryptedComponentKey) error
	Get(id string) (domain.EncryptedComponentKey, error)
	List(domain.EncryptedComponentKeyFilter) ([]domain.EncryptedComponentKey, error)
	Update(domain.EncryptedComponentKey) error
}

type RunDistributionRepository interface {
	Create(domain.RunDistribution) error
	Get(id string) (domain.RunDistribution, error)
	List(domain.RunDistributionFilter) ([]domain.RunDistribution, error)
	Update(domain.RunDistribution) error
}

type ClientManagerDistributionRepository interface {
	Create(domain.ClientManagerDistribution) error
	Get(id string) (domain.ClientManagerDistribution, error)
	List(domain.ClientManagerDistributionFilter) ([]domain.ClientManagerDistribution, error)
	Update(domain.ClientManagerDistribution) error
}

type DependencyStatusRepository interface {
	Create(domain.DependencyStatus) error
	Get(id string) (domain.DependencyStatus, error)
	List(domain.DependencyStatusFilter) ([]domain.DependencyStatus, error)
	Update(domain.DependencyStatus) error
}

type ClientManagerBuildJobRepository interface {
	Create(domain.ClientManagerBuildJob) error
	Get(id string) (domain.ClientManagerBuildJob, error)
	List(domain.ClientManagerBuildJobFilter) ([]domain.ClientManagerBuildJob, error)
	Update(domain.ClientManagerBuildJob) error
}

type RunUpdateJobRepository interface {
	Create(domain.RunUpdateJob) error
	Get(id string) (domain.RunUpdateJob, error)
	List(domain.RunUpdateJobFilter) ([]domain.RunUpdateJob, error)
	Update(domain.RunUpdateJob) error
}

type LogStreamRepository interface {
	Create(domain.LogStream) error
	Get(id string) (domain.LogStream, error)
	List(domain.LogStreamFilter) ([]domain.LogStream, error)
	Update(domain.LogStream) error
}

type AuditEventRepository interface {
	Create(domain.AuditEvent) error
	Get(id string) (domain.AuditEvent, error)
	List(domain.AuditEventFilter) ([]domain.AuditEvent, error)
	Update(domain.AuditEvent) error
}

type Store interface {
	Users() UserRepository
	AIProviders() AIProviderRepository
	GamePlugins() GamePluginRepository
	ServerInstances() ServerInstanceRepository
	RunEndpoints() RunEndpointRepository
	Jobs() JobRepository
	Artifacts() ArtifactRepository
	RuntimeBindings() RuntimeBindingRepository
	EncryptedComponentKeys() EncryptedComponentKeyRepository
	RunDistributions() RunDistributionRepository
	ClientManagerDistributions() ClientManagerDistributionRepository
	DependencyStatuses() DependencyStatusRepository
	ClientManagerBuildJobs() ClientManagerBuildJobRepository
	RunUpdateJobs() RunUpdateJobRepository
	LogStreams() LogStreamRepository
	AuditEvents() AuditEventRepository
}

type MemoryStore struct {
	users           *memoryRepository[domain.User, domain.UserFilter]
	aiProviders     *memoryRepository[domain.AIProvider, domain.AIProviderFilter]
	gamePlugins     *memoryRepository[domain.GamePlugin, domain.GamePluginFilter]
	serverInstances *memoryRepository[domain.ServerInstance, domain.ServerInstanceFilter]
	runEndpoints    *memoryRepository[domain.RunEndpoint, domain.RunEndpointFilter]
	jobs            *memoryJobRepository
	artifacts       *memoryRepository[domain.Artifact, domain.ArtifactFilter]
	runtimeBindings *memoryRepository[domain.RuntimeBinding, domain.RuntimeBindingFilter]
	componentKeys   *memoryRepository[domain.EncryptedComponentKey, domain.EncryptedComponentKeyFilter]
	runDists        *memoryRepository[domain.RunDistribution, domain.RunDistributionFilter]
	clientDists     *memoryRepository[domain.ClientManagerDistribution, domain.ClientManagerDistributionFilter]
	dependencies    *memoryRepository[domain.DependencyStatus, domain.DependencyStatusFilter]
	buildJobs       *memoryRepository[domain.ClientManagerBuildJob, domain.ClientManagerBuildJobFilter]
	updateJobs      *memoryRepository[domain.RunUpdateJob, domain.RunUpdateJobFilter]
	logStreams      *memoryRepository[domain.LogStream, domain.LogStreamFilter]
	auditEvents     *memoryRepository[domain.AuditEvent, domain.AuditEventFilter]
}

func NewMemoryStore() *MemoryStore {
	return &MemoryStore{
		users: newMemoryRepository(
			func(user domain.User) string { return user.ID },
			domain.CopyUser,
			matchUser,
		),
		aiProviders: newMemoryRepository(
			func(provider domain.AIProvider) string { return provider.ID },
			domain.CopyAIProvider,
			matchAIProvider,
		),
		gamePlugins: newMemoryRepository(
			func(plugin domain.GamePlugin) string { return plugin.ID },
			domain.CopyGamePlugin,
			matchGamePlugin,
		),
		serverInstances: newMemoryRepository(
			func(instance domain.ServerInstance) string { return instance.ID },
			domain.CopyServerInstance,
			matchServerInstance,
		),
		runEndpoints: newMemoryRepository(
			func(endpoint domain.RunEndpoint) string { return endpoint.ID },
			domain.CopyRunEndpoint,
			matchRunEndpoint,
		),
		jobs: newMemoryJobRepository(),
		artifacts: newMemoryRepository(
			func(artifact domain.Artifact) string { return artifact.ID },
			domain.CopyArtifact,
			matchArtifact,
		),
		runtimeBindings: newMemoryRepository(
			func(binding domain.RuntimeBinding) string { return binding.ID },
			domain.CopyRuntimeBinding,
			matchRuntimeBinding,
		),
		componentKeys: newMemoryRepository(
			func(key domain.EncryptedComponentKey) string { return key.ID },
			domain.CopyEncryptedComponentKey,
			matchEncryptedComponentKey,
		),
		runDists: newMemoryRepository(
			func(distribution domain.RunDistribution) string { return distribution.ID },
			domain.CopyRunDistribution,
			matchRunDistribution,
		),
		clientDists: newMemoryRepository(
			func(distribution domain.ClientManagerDistribution) string { return distribution.ID },
			domain.CopyClientManagerDistribution,
			matchClientManagerDistribution,
		),
		dependencies: newMemoryRepository(
			func(status domain.DependencyStatus) string { return status.ID },
			domain.CopyDependencyStatus,
			matchDependencyStatus,
		),
		buildJobs: newMemoryRepository(
			func(job domain.ClientManagerBuildJob) string { return job.ID },
			domain.CopyClientManagerBuildJob,
			matchClientManagerBuildJob,
		),
		updateJobs: newMemoryRepository(
			func(job domain.RunUpdateJob) string { return job.ID },
			domain.CopyRunUpdateJob,
			matchRunUpdateJob,
		),
		logStreams: newMemoryRepository(
			func(stream domain.LogStream) string { return stream.ID },
			domain.CopyLogStream,
			matchLogStream,
		),
		auditEvents: newMemoryRepository(
			func(event domain.AuditEvent) string { return event.ID },
			domain.CopyAuditEvent,
			matchAuditEvent,
		),
	}
}

func (store *MemoryStore) Users() UserRepository                     { return store.users }
func (store *MemoryStore) AIProviders() AIProviderRepository         { return store.aiProviders }
func (store *MemoryStore) GamePlugins() GamePluginRepository         { return store.gamePlugins }
func (store *MemoryStore) ServerInstances() ServerInstanceRepository { return store.serverInstances }
func (store *MemoryStore) RunEndpoints() RunEndpointRepository       { return store.runEndpoints }
func (store *MemoryStore) Jobs() JobRepository                       { return store.jobs }
func (store *MemoryStore) Artifacts() ArtifactRepository             { return store.artifacts }
func (store *MemoryStore) RuntimeBindings() RuntimeBindingRepository { return store.runtimeBindings }
func (store *MemoryStore) EncryptedComponentKeys() EncryptedComponentKeyRepository {
	return store.componentKeys
}
func (store *MemoryStore) RunDistributions() RunDistributionRepository { return store.runDists }
func (store *MemoryStore) ClientManagerDistributions() ClientManagerDistributionRepository {
	return store.clientDists
}
func (store *MemoryStore) DependencyStatuses() DependencyStatusRepository { return store.dependencies }
func (store *MemoryStore) ClientManagerBuildJobs() ClientManagerBuildJobRepository {
	return store.buildJobs
}
func (store *MemoryStore) RunUpdateJobs() RunUpdateJobRepository { return store.updateJobs }
func (store *MemoryStore) LogStreams() LogStreamRepository       { return store.logStreams }
func (store *MemoryStore) AuditEvents() AuditEventRepository     { return store.auditEvents }

type memoryRepository[T any, F any] struct {
	mu     sync.RWMutex
	byID   map[string]T
	idOf   func(T) string
	copyOf func(T) T
	match  func(T, F) bool
}

func newMemoryRepository[T any, F any](idOf func(T) string, copyOf func(T) T, match func(T, F) bool) *memoryRepository[T, F] {
	return &memoryRepository[T, F]{
		byID:   map[string]T{},
		idOf:   idOf,
		copyOf: copyOf,
		match:  match,
	}
}

func (repository *memoryRepository[T, F]) Create(value T) error {
	repository.mu.Lock()
	defer repository.mu.Unlock()

	id := repository.idOf(value)
	if _, exists := repository.byID[id]; exists {
		return ErrDuplicate
	}
	repository.byID[id] = repository.copyOf(value)
	return nil
}

func (repository *memoryRepository[T, F]) Get(id string) (T, error) {
	repository.mu.RLock()
	defer repository.mu.RUnlock()

	value, exists := repository.byID[id]
	if !exists {
		var zero T
		return zero, ErrNotFound
	}
	return repository.copyOf(value), nil
}

func (repository *memoryRepository[T, F]) List(filter F) ([]T, error) {
	repository.mu.RLock()
	defer repository.mu.RUnlock()

	ids := make([]string, 0, len(repository.byID))
	for id := range repository.byID {
		ids = append(ids, id)
	}
	sort.Strings(ids)

	values := make([]T, 0, len(ids))
	for _, id := range ids {
		value := repository.byID[id]
		if repository.match(value, filter) {
			values = append(values, repository.copyOf(value))
		}
	}
	return values, nil
}

func (repository *memoryRepository[T, F]) Update(value T) error {
	repository.mu.Lock()
	defer repository.mu.Unlock()

	id := repository.idOf(value)
	if _, exists := repository.byID[id]; !exists {
		return ErrNotFound
	}
	repository.byID[id] = repository.copyOf(value)
	return nil
}

type memoryJobRepository struct {
	*memoryRepository[domain.Job, domain.JobFilter]
}

func newMemoryJobRepository() *memoryJobRepository {
	return &memoryJobRepository{
		memoryRepository: newMemoryRepository(
			func(job domain.Job) string { return job.ID },
			domain.CopyJob,
			matchJob,
		),
	}
}

func (repository *memoryJobRepository) GetByIdempotency(runEndpointID string, idempotencyKey string) (domain.Job, error) {
	repository.mu.RLock()
	defer repository.mu.RUnlock()

	for _, job := range repository.byID {
		if job.RunEndpointID == runEndpointID && job.IdempotencyKey == idempotencyKey {
			return domain.CopyJob(job), nil
		}
	}
	return domain.Job{}, ErrNotFound
}

func matchUser(user domain.User, filter domain.UserFilter) bool {
	return filter.Status == "" || user.Status == filter.Status
}

func matchAIProvider(provider domain.AIProvider, filter domain.AIProviderFilter) bool {
	return (filter.Kind == "" || provider.Kind == filter.Kind) &&
		(filter.Status == "" || provider.Status == filter.Status)
}

func matchGamePlugin(plugin domain.GamePlugin, filter domain.GamePluginFilter) bool {
	return (filter.ServerType == "" || plugin.ServerType == filter.ServerType) &&
		(filter.Status == "" || plugin.Status == filter.Status)
}

func matchServerInstance(instance domain.ServerInstance, filter domain.ServerInstanceFilter) bool {
	if instance.State == domain.ServerInstanceStateDeleted && filter.State != domain.ServerInstanceStateDeleted {
		return false
	}
	return (filter.PluginID == "" || instance.PluginID == filter.PluginID) &&
		(filter.RunEndpointID == "" || instance.RunEndpointID == filter.RunEndpointID) &&
		(filter.State == "" || instance.State == filter.State) &&
		(filter.VisibleToUserID == "" || instance.OwnerUserID == filter.VisibleToUserID || containsString(instance.AdminUserIDs, filter.VisibleToUserID))
}

func containsString(values []string, target string) bool {
	for _, value := range values {
		if value == target {
			return true
		}
	}
	return false
}

func matchRunEndpoint(endpoint domain.RunEndpoint, filter domain.RunEndpointFilter) bool {
	return filter.Status == "" || endpoint.Status == filter.Status
}

func matchJob(job domain.Job, filter domain.JobFilter) bool {
	return (filter.ServerInstanceID == "" || job.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.RunEndpointID == "" || job.RunEndpointID == filter.RunEndpointID) &&
		(filter.State == "" || job.State == filter.State)
}

func matchArtifact(artifact domain.Artifact, filter domain.ArtifactFilter) bool {
	return (filter.OwnerKind == "" || artifact.OwnerKind == filter.OwnerKind) &&
		(filter.OwnerID == "" || artifact.OwnerID == filter.OwnerID) &&
		(filter.State == "" || artifact.State == filter.State)
}

func matchRuntimeBinding(binding domain.RuntimeBinding, filter domain.RuntimeBindingFilter) bool {
	return (filter.ServerInstanceID == "" || binding.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.ProfileKey == "" || binding.ProfileKey == filter.ProfileKey) &&
		(filter.Status == "" || binding.Status == filter.Status)
}

func matchEncryptedComponentKey(key domain.EncryptedComponentKey, filter domain.EncryptedComponentKeyFilter) bool {
	return (filter.ServerInstanceID == "" || key.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.ComponentKind == "" || key.ComponentKind == filter.ComponentKind) &&
		(filter.ComponentKey == "" || key.ComponentKey == filter.ComponentKey) &&
		(filter.Status == "" || key.Status == filter.Status)
}

func matchRunDistribution(distribution domain.RunDistribution, filter domain.RunDistributionFilter) bool {
	return (filter.ServerInstanceID == "" || distribution.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.TargetOS == "" || distribution.TargetOS == filter.TargetOS) &&
		(filter.TargetArch == "" || distribution.TargetArch == filter.TargetArch) &&
		(filter.Status == "" || distribution.Status == filter.Status)
}

func matchClientManagerDistribution(distribution domain.ClientManagerDistribution, filter domain.ClientManagerDistributionFilter) bool {
	return (filter.ServerInstanceID == "" || distribution.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.ProfileKey == "" || distribution.ProfileKey == filter.ProfileKey) &&
		(filter.TargetOS == "" || distribution.TargetOS == filter.TargetOS) &&
		(filter.TargetArch == "" || distribution.TargetArch == filter.TargetArch) &&
		(filter.Status == "" || distribution.Status == filter.Status)
}

func matchDependencyStatus(status domain.DependencyStatus, filter domain.DependencyStatusFilter) bool {
	return (filter.ServerInstanceID == "" || status.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.ProbeKey == "" || status.ProbeKey == filter.ProbeKey) &&
		(filter.State == "" || status.State == filter.State)
}

func matchClientManagerBuildJob(job domain.ClientManagerBuildJob, filter domain.ClientManagerBuildJobFilter) bool {
	return (filter.ServerInstanceID == "" || job.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.ProfileKey == "" || job.ProfileKey == filter.ProfileKey) &&
		(filter.Status == "" || job.Status == filter.Status)
}

func matchRunUpdateJob(job domain.RunUpdateJob, filter domain.RunUpdateJobFilter) bool {
	return (filter.ServerInstanceID == "" || job.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.Status == "" || job.Status == filter.Status)
}

func matchLogStream(stream domain.LogStream, filter domain.LogStreamFilter) bool {
	return (filter.ServerInstanceID == "" || stream.ServerInstanceID == filter.ServerInstanceID) &&
		(filter.StreamKey == "" || stream.StreamKey == filter.StreamKey)
}

func matchAuditEvent(event domain.AuditEvent, filter domain.AuditEventFilter) bool {
	return (filter.ActorID == "" || event.ActorID == filter.ActorID) &&
		(filter.ResourceKind == "" || event.ResourceKind == filter.ResourceKind) &&
		(filter.ResourceID == "" || event.ResourceID == filter.ResourceID) &&
		(filter.Result == "" || event.Result == filter.Result)
}