package service

import (
	"context"
	"fmt"
	"time"

	"github.com/orchard9/rdev/internal/domain"
	"github.com/orchard9/rdev/internal/port"
)

// mockWorkQueue implements port.WorkQueue for service tests.
// Configure tasks and err fields to control behavior.
type mockWorkQueue struct {
	tasks map[string]*domain.WorkTask
	err   error
}

func newMockWorkQueue() *mockWorkQueue {
	return &mockWorkQueue{tasks: make(map[string]*domain.WorkTask)}
}

func (m *mockWorkQueue) Enqueue(ctx context.Context, task *domain.WorkTask) (string, error) {
	if m.err != nil {
		return "", m.err
	}
	id := fmt.Sprintf("task-%d", len(m.tasks)+1)
	task.ID = id
	task.Status = domain.WorkTaskStatusPending
	task.CreatedAt = time.Now()
	m.tasks[id] = task
	return id, nil
}

func (m *mockWorkQueue) Dequeue(ctx context.Context, workerID string) (*domain.WorkTask, error) {
	if m.err != nil {
		return nil, m.err
	}
	for _, task := range m.tasks {
		if task.Status == domain.WorkTaskStatusPending {
			task.Status = domain.WorkTaskStatusRunning
			task.WorkerID = workerID
			now := time.Now()
			task.StartedAt = &now
			return task, nil
		}
	}
	return nil, nil
}

func (m *mockWorkQueue) Complete(ctx context.Context, taskID string, result *domain.WorkResult) error {
	if m.err != nil {
		return m.err
	}
	task, ok := m.tasks[taskID]
	if !ok {
		return domain.ErrWorkTaskNotFound
	}
	task.Status = domain.WorkTaskStatusCompleted
	task.Result = result
	return nil
}

func (m *mockWorkQueue) Fail(ctx context.Context, taskID string, errMsg string) error {
	return nil
}

func (m *mockWorkQueue) Cancel(ctx context.Context, taskID string) error {
	return nil
}

func (m *mockWorkQueue) GetTask(ctx context.Context, taskID string) (*domain.WorkTask, error) {
	task, ok := m.tasks[taskID]
	if !ok {
		return nil, domain.ErrWorkTaskNotFound
	}
	return task, nil
}

func (m *mockWorkQueue) ListByProject(ctx context.Context, projectID string, status *domain.WorkTaskStatus, opts domain.WorkListOptions) (*domain.WorkListResult, error) {
	return &domain.WorkListResult{}, nil
}

func (m *mockWorkQueue) GetStats(ctx context.Context) (*domain.WorkQueueStats, error) {
	return &domain.WorkQueueStats{}, nil
}

func (m *mockWorkQueue) CleanupOld(ctx context.Context, olderThan time.Duration) (int64, error) {
	return 0, nil
}

func (m *mockWorkQueue) RequeueStale(ctx context.Context, timeout time.Duration) (int64, error) {
	return 0, nil
}

// mockBuildAudit implements port.BuildAudit for service tests.
type mockBuildAudit struct {
	entries map[string]*domain.BuildAuditEntry
	err     error
}

func newMockBuildAudit() *mockBuildAudit {
	return &mockBuildAudit{entries: make(map[string]*domain.BuildAuditEntry)}
}

func (m *mockBuildAudit) Record(ctx context.Context, entry *domain.BuildAuditEntry) error {
	if m.err != nil {
		return m.err
	}
	m.entries[entry.TaskID] = entry
	return nil
}

func (m *mockBuildAudit) Update(ctx context.Context, taskID string, result *domain.BuildResult) error {
	if m.err != nil {
		return m.err
	}
	entry, ok := m.entries[taskID]
	if !ok {
		return domain.ErrBuildNotFound
	}
	entry.Result = result
	if result.Success {
		entry.Status = domain.BuildStatusCompleted
	} else {
		entry.Status = domain.BuildStatusFailed
	}
	now := time.Now()
	entry.CompletedAt = &now
	return nil
}

func (m *mockBuildAudit) UpdateStatus(ctx context.Context, taskID string, status domain.BuildStatus, workerID string) error {
	if m.err != nil {
		return m.err
	}
	entry, ok := m.entries[taskID]
	if !ok {
		return domain.ErrBuildNotFound
	}
	entry.Status = status
	entry.WorkerID = workerID
	return nil
}

func (m *mockBuildAudit) Get(ctx context.Context, taskID string) (*domain.BuildAuditEntry, error) {
	if m.err != nil {
		return nil, m.err
	}
	entry, ok := m.entries[taskID]
	if !ok {
		return nil, domain.ErrBuildNotFound
	}
	return entry, nil
}

func (m *mockBuildAudit) List(ctx context.Context, filter port.BuildAuditFilter) ([]*domain.BuildAuditEntry, error) {
	if m.err != nil {
		return nil, m.err
	}
	var result []*domain.BuildAuditEntry
	for _, entry := range m.entries {
		if filter.ProjectID != "" && entry.ProjectID != filter.ProjectID {
			continue
		}
		result = append(result, entry)
	}
	if filter.Limit > 0 && len(result) > filter.Limit {
		result = result[:filter.Limit]
	}
	return result, nil
}

// mockWorkerRegistry implements port.WorkerRegistry for service tests.
type mockWorkerRegistry struct {
	workers map[string]*domain.Worker
	err     error
}

func newMockWorkerRegistry() *mockWorkerRegistry {
	return &mockWorkerRegistry{workers: make(map[string]*domain.Worker)}
}

func (m *mockWorkerRegistry) Register(ctx context.Context, worker *domain.Worker) error {
	if m.err != nil {
		return m.err
	}
	m.workers[worker.ID] = worker
	return nil
}

func (m *mockWorkerRegistry) Heartbeat(ctx context.Context, workerID string) error {
	if m.err != nil {
		return m.err
	}
	w, ok := m.workers[workerID]
	if !ok {
		return domain.ErrWorkerNotFound
	}
	w.LastHeartbeat = time.Now()
	return nil
}

func (m *mockWorkerRegistry) UpdateStatus(ctx context.Context, workerID string, status domain.WorkerStatus, taskID string) error {
	if m.err != nil {
		return m.err
	}
	w, ok := m.workers[workerID]
	if !ok {
		return domain.ErrWorkerNotFound
	}
	w.Status = status
	w.CurrentTask = taskID
	return nil
}

func (m *mockWorkerRegistry) Deregister(ctx context.Context, workerID string) error {
	if m.err != nil {
		return m.err
	}
	if _, ok := m.workers[workerID]; !ok {
		return domain.ErrWorkerNotFound
	}
	delete(m.workers, workerID)
	return nil
}

func (m *mockWorkerRegistry) Get(ctx context.Context, workerID string) (*domain.Worker, error) {
	if m.err != nil {
		return nil, m.err
	}
	w, ok := m.workers[workerID]
	if !ok {
		return nil, domain.ErrWorkerNotFound
	}
	return w, nil
}

func (m *mockWorkerRegistry) List(ctx context.Context, filter port.WorkerFilter) ([]*domain.Worker, error) {
	if m.err != nil {
		return nil, m.err
	}
	var result []*domain.Worker
	for _, w := range m.workers {
		if filter.Status != nil && w.Status != *filter.Status {
			continue
		}
		result = append(result, w)
	}
	if filter.Limit > 0 && len(result) > filter.Limit {
		result = result[:filter.Limit]
	}
	return result, nil
}

func (m *mockWorkerRegistry) MarkStaleOffline(ctx context.Context, threshold time.Duration) (int, error) {
	if m.err != nil {
		return 0, m.err
	}
	count := 0
	for _, w := range m.workers {
		if w.Status != domain.WorkerStatusOffline && time.Since(w.LastHeartbeat) > threshold {
			w.Status = domain.WorkerStatusOffline
			w.CurrentTask = ""
			count++
		}
	}
	return count, nil
}