package ui

import (
	"context"
	"sync"

	"github.com/nvm/kportal/internal/config"
	"github.com/nvm/kportal/internal/k8s"
)

// MockDiscovery is a mock implementation of DiscoveryInterface for testing
type MockDiscovery struct {
	mu sync.Mutex

	// Return values
	Contexts         []string
	CurrentContext   string
	Namespaces       []string
	Pods             []k8s.PodInfo
	PodsWithSelector []k8s.PodInfo
	Services         []k8s.ServiceInfo

	// Errors to return
	ListContextsErr         error
	GetCurrentContextErr    error
	ListNamespacesErr       error
	ListPodsErr             error
	ListPodsWithSelectorErr error
	ListServicesErr         error

	// Call tracking
	ListContextsCalls         int
	GetCurrentContextCalls    int
	ListNamespacesCalls       int
	ListPodsCalls             int
	ListPodsWithSelectorCalls int
	ListServicesCalls         int

	// Captured arguments
	LastContextName string
	LastNamespace   string
	LastSelector    string
}

func NewMockDiscovery() *MockDiscovery {
	return &MockDiscovery{
		Contexts:   []string{"default", "production", "staging"},
		Namespaces: []string{"default", "kube-system"},
	}
}

func (m *MockDiscovery) ListContexts() ([]string, error) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.ListContextsCalls++
	return m.Contexts, m.ListContextsErr
}

func (m *MockDiscovery) GetCurrentContext() (string, error) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.GetCurrentContextCalls++
	if m.CurrentContext == "" {
		return "default", m.GetCurrentContextErr
	}
	return m.CurrentContext, m.GetCurrentContextErr
}

func (m *MockDiscovery) ListNamespaces(ctx context.Context, contextName string) ([]string, error) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.ListNamespacesCalls++
	m.LastContextName = contextName
	return m.Namespaces, m.ListNamespacesErr
}

func (m *MockDiscovery) ListPods(ctx context.Context, contextName, namespace string) ([]k8s.PodInfo, error) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.ListPodsCalls++
	m.LastContextName = contextName
	m.LastNamespace = namespace
	return m.Pods, m.ListPodsErr
}

func (m *MockDiscovery) ListPodsWithSelector(ctx context.Context, contextName, namespace, selector string) ([]k8s.PodInfo, error) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.ListPodsWithSelectorCalls++
	m.LastContextName = contextName
	m.LastNamespace = namespace
	m.LastSelector = selector
	return m.PodsWithSelector, m.ListPodsWithSelectorErr
}

func (m *MockDiscovery) ListServices(ctx context.Context, contextName, namespace string) ([]k8s.ServiceInfo, error) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.ListServicesCalls++
	m.LastContextName = contextName
	m.LastNamespace = namespace
	return m.Services, m.ListServicesErr
}

// MockMutator is a mock implementation of MutatorInterface for testing
type MockMutator struct {
	mu sync.Mutex

	// Errors to return
	AddForwardErr        error
	RemoveForwardsErr    error
	RemoveForwardByIDErr error
	UpdateForwardErr     error

	// Call tracking
	AddForwardCalls        int
	RemoveForwardsCalls    int
	RemoveForwardByIDCalls int
	UpdateForwardCalls     int

	// Captured arguments
	LastContextName   string
	LastNamespaceName string
	LastForward       config.Forward
	LastOldID         string
	LastRemovedID     string
	LastPredicate     func(ctx, ns string, fwd config.Forward) bool

	// Storage for testing
	Forwards []struct {
		Context   string
		Namespace string
		Forward   config.Forward
	}
}

func NewMockMutator() *MockMutator {
	return &MockMutator{}
}

func (m *MockMutator) AddForward(contextName, namespaceName string, fwd config.Forward) error {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.AddForwardCalls++
	m.LastContextName = contextName
	m.LastNamespaceName = namespaceName
	m.LastForward = fwd

	if m.AddForwardErr == nil {
		m.Forwards = append(m.Forwards, struct {
			Context   string
			Namespace string
			Forward   config.Forward
		}{contextName, namespaceName, fwd})
	}

	return m.AddForwardErr
}

func (m *MockMutator) RemoveForwards(predicate func(ctx, ns string, fwd config.Forward) bool) error {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.RemoveForwardsCalls++
	m.LastPredicate = predicate
	return m.RemoveForwardsErr
}

func (m *MockMutator) RemoveForwardByID(id string) error {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.RemoveForwardByIDCalls++
	m.LastRemovedID = id
	return m.RemoveForwardByIDErr
}

func (m *MockMutator) UpdateForward(oldID, newContextName, newNamespaceName string, newFwd config.Forward) error {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.UpdateForwardCalls++
	m.LastOldID = oldID
	m.LastContextName = newContextName
	m.LastNamespaceName = newNamespaceName
	m.LastForward = newFwd
	return m.UpdateForwardErr
}

// MockHTTPLogSubscriber is a mock for HTTP log subscription
type MockHTTPLogSubscriber struct {
	mu sync.Mutex

	// Subscription tracking
	Subscriptions map[string]func(HTTPLogEntry)
	CleanupCalls  int

	// Control
	ShouldFail bool
}

func NewMockHTTPLogSubscriber() *MockHTTPLogSubscriber {
	return &MockHTTPLogSubscriber{
		Subscriptions: make(map[string]func(HTTPLogEntry)),
	}
}

// Subscribe returns a cleanup function
func (m *MockHTTPLogSubscriber) Subscribe(forwardID string, callback func(HTTPLogEntry)) func() {
	m.mu.Lock()
	defer m.mu.Unlock()

	m.Subscriptions[forwardID] = callback

	return func() {
		m.mu.Lock()
		defer m.mu.Unlock()
		m.CleanupCalls++
		delete(m.Subscriptions, forwardID)
	}
}

// SendEntry sends an entry to a subscribed callback (for testing)
func (m *MockHTTPLogSubscriber) SendEntry(forwardID string, entry HTTPLogEntry) {
	m.mu.Lock()
	callback, exists := m.Subscriptions[forwardID]
	m.mu.Unlock()

	if exists && callback != nil {
		callback(entry)
	}
}

// GetSubscriberFunc returns the function signature expected by the UI
func (m *MockHTTPLogSubscriber) GetSubscriberFunc() HTTPLogSubscriber {
	return func(forwardID string, callback func(entry HTTPLogEntry)) func() {
		return m.Subscribe(forwardID, callback)
	}
}

// MockToggleCallback tracks toggle callback invocations
type MockToggleCallback struct {
	mu    sync.Mutex
	Calls []struct {
		ID     string
		Enable bool
	}
}

func NewMockToggleCallback() *MockToggleCallback {
	return &MockToggleCallback{}
}

func (m *MockToggleCallback) Callback(id string, enable bool) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.Calls = append(m.Calls, struct {
		ID     string
		Enable bool
	}{id, enable})
}

func (m *MockToggleCallback) GetFunc() func(string, bool) {
	return m.Callback
}

func (m *MockToggleCallback) CallCount() int {
	m.mu.Lock()
	defer m.mu.Unlock()
	return len(m.Calls)
}

func (m *MockToggleCallback) LastCall() (string, bool, bool) {
	m.mu.Lock()
	defer m.mu.Unlock()
	if len(m.Calls) == 0 {
		return "", false, false
	}
	last := m.Calls[len(m.Calls)-1]
	return last.ID, last.Enable, true
}