package jobs

import (
	"context"
	"fmt"
	"log/slog"
	"os"
	"testing"
	"time"

	"git.nakama.town/fmartingr/hako/internal/archival/archiver"
	"git.nakama.town/fmartingr/hako/internal/extractors"
	"git.nakama.town/fmartingr/hako/internal/model"
	"github.com/stretchr/testify/require"
)

func TestWorker_ProcessJob_Success(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	// Create mocks
	queue := NewMemoryQueue()
	mockArchiveService := &MockArchiveService{}
	mockArchiveStore := NewMockArchiveStore()
	mockArchiveFileStore := NewMockArchiveFileStore()
	mockLinkStore := NewMockLinkStore()
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelError}))

	// Create temporary storage for archiver manager
	tmpDir, err := os.MkdirTemp("", "test_worker_*")
	require.NoError(t, err)
	defer func() {
		_ = os.RemoveAll(tmpDir)
	}()

	archiverMgr := archiver.NewManager()
	extractorMgr := extractors.NewManager(logger)

	// Create worker
	worker := NewWorker(queue, archiverMgr, extractorMgr, mockArchiveService, mockArchiveStore, mockArchiveFileStore, mockLinkStore, tmpDir, logger)

	// Add a link to the mock store
	link := &model.Link{
		ID:     "link-123",
		URL:    "https://example.com",
		UserID: "user-123",
	}
	mockLinkStore.AddLink(link)

	// Add an archive to the mock store
	archive := &model.Archive{
		ID:     "archive-123",
		LinkID: "link-123",
		UserID: "user-123",
		Status: model.ArchiveStatusPending,
	}
	mockArchiveStore.AddArchive(archive)

	// Enqueue a job
	payload := model.ArchiveLinkPayload{
		LinkID:    "link-123",
		ArchiveID: "archive-123",
	}
	err = queue.Enqueue(ctx, model.JobTypeArchiveLink, payload)
	require.NoError(t, err)

	// Start worker in background
	workerCtx, workerCancel := context.WithCancel(ctx)
	defer workerCancel()

	go func() {
		_ = worker.Start(workerCtx)
	}()

	// Wait for job to be processed
	time.Sleep(500 * time.Millisecond)

	// Verify the archive service was called
	require.Equal(t, 1, mockArchiveService.GetProcessedCount())
	processedItems := mockArchiveService.GetProcessedItems()
	require.Len(t, processedItems, 1)
	require.Equal(t, "archive-123", processedItems[0])
}

func TestWorker_ProcessJob_ArchiveServiceFailure(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	queue := NewMemoryQueue()
	mockArchiveService := NewMockArchiveService()
	mockArchiveService.ShouldFail = true
	mockArchiveStore := NewMockArchiveStore()
	mockLinkStore := NewMockLinkStore()
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelError}))

	tmpDir, err := os.MkdirTemp("", "test_worker_*")
	require.NoError(t, err)
	defer func() {
		_ = os.RemoveAll(tmpDir)
	}()

	extractorMgr := archiver.NewManager()
	contentExtractorMgr := extractors.NewManager(logger)
	mockArchiveFileStore := NewMockArchiveFileStore()

	worker := NewWorker(queue, extractorMgr, contentExtractorMgr, mockArchiveService, mockArchiveStore, mockArchiveFileStore, mockLinkStore, tmpDir, logger)

	link := &model.Link{
		ID:     "link-456",
		URL:    "https://example.com/fail",
		UserID: "user-456",
	}
	mockLinkStore.AddLink(link)

	// Add archive to mock store
	archive := &model.Archive{
		ID:     "archive-456",
		LinkID: "link-456",
		UserID: "user-456",
		Status: model.ArchiveStatusPending,
	}
	mockArchiveStore.AddArchive(archive)

	payload := model.ArchiveLinkPayload{
		LinkID:    "link-456",
		ArchiveID: "archive-456",
	}
	err = queue.Enqueue(ctx, model.JobTypeArchiveLink, payload)
	require.NoError(t, err)

	workerCtx, workerCancel := context.WithCancel(ctx)
	defer workerCancel()

	go func() {
		_ = worker.Start(workerCtx)
	}()

	time.Sleep(500 * time.Millisecond)

	// Archive service should have been called but failed
	require.Equal(t, 1, mockArchiveService.GetProcessedCount())
}

func TestWorker_ProcessJob_LinkNotFound(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	queue := NewMemoryQueue()
	mockArchiveService := NewMockArchiveService()
	mockArchiveStore := NewMockArchiveStore()
	mockLinkStore := NewMockLinkStore()
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelError}))

	tmpDir, err := os.MkdirTemp("", "test_worker_*")
	require.NoError(t, err)
	defer func() {
		_ = os.RemoveAll(tmpDir)
	}()

	extractorMgr := archiver.NewManager()
	contentExtractorMgr := extractors.NewManager(logger)
	mockArchiveFileStore := NewMockArchiveFileStore()

	worker := NewWorker(queue, extractorMgr, contentExtractorMgr, mockArchiveService, mockArchiveStore, mockArchiveFileStore, mockLinkStore, tmpDir, logger)

	// Don't add link to store - it won't be found
	payload := model.ArchiveLinkPayload{
		LinkID:    "nonexistent-link",
		ArchiveID: "archive-789",
	}
	err = queue.Enqueue(ctx, model.JobTypeArchiveLink, payload)
	require.NoError(t, err)

	workerCtx, workerCancel := context.WithCancel(ctx)
	defer workerCancel()

	go func() {
		_ = worker.Start(workerCtx)
	}()

	time.Sleep(500 * time.Millisecond)

	// Archive service should NOT have been called because link wasn't found
	require.Equal(t, 0, mockArchiveService.GetProcessedCount())
}

func TestWorker_ProcessJob_InvalidPayload(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	queue := NewMemoryQueue()
	mockArchiveService := NewMockArchiveService()
	mockArchiveStore := NewMockArchiveStore()
	mockLinkStore := NewMockLinkStore()
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelError}))

	tmpDir, err := os.MkdirTemp("", "test_worker_*")
	require.NoError(t, err)
	defer func() {
		_ = os.RemoveAll(tmpDir)
	}()

	extractorMgr := archiver.NewManager()
	contentExtractorMgr := extractors.NewManager(logger)
	mockArchiveFileStore := NewMockArchiveFileStore()

	worker := NewWorker(queue, extractorMgr, contentExtractorMgr, mockArchiveService, mockArchiveStore, mockArchiveFileStore, mockLinkStore, tmpDir, logger)

	// Enqueue job with invalid payload (not valid JSON)
	err = queue.Enqueue(ctx, model.JobTypeArchiveLink, "not-valid-json{{{")
	require.NoError(t, err)

	workerCtx, workerCancel := context.WithCancel(ctx)
	defer workerCancel()

	go func() {
		_ = worker.Start(workerCtx)
	}()

	time.Sleep(500 * time.Millisecond)

	// Archive service should NOT have been called due to invalid payload
	require.Equal(t, 0, mockArchiveService.GetProcessedCount())
}

func TestWorker_StartStop(t *testing.T) {
	ctx := context.Background()

	queue := NewMemoryQueue()
	mockArchiveService := NewMockArchiveService()
	mockArchiveStore := NewMockArchiveStore()
	mockLinkStore := NewMockLinkStore()
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelError}))

	tmpDir, err := os.MkdirTemp("", "test_worker_*")
	require.NoError(t, err)
	defer func() {
		_ = os.RemoveAll(tmpDir)
	}()

	extractorMgr := archiver.NewManager()
	contentExtractorMgr := extractors.NewManager(logger)
	mockArchiveFileStore := NewMockArchiveFileStore()

	worker := NewWorker(queue, extractorMgr, contentExtractorMgr, mockArchiveService, mockArchiveStore, mockArchiveFileStore, mockLinkStore, tmpDir, logger)

	// Start worker
	workerCtx, cancel := context.WithCancel(ctx)

	done := make(chan error, 1)
	go func() {
		done <- worker.Start(workerCtx)
	}()

	// Let it run briefly
	time.Sleep(100 * time.Millisecond)

	// Stop worker
	cancel()

	// Wait for worker to stop
	select {
	case err := <-done:
		require.NoError(t, err)
	case <-time.After(2 * time.Second):
		t.Fatal("Worker did not stop in time")
	}
}

func TestWorker_MultipleJobs(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	queue := NewMemoryQueue()
	mockArchiveService := NewMockArchiveService()
	mockArchiveStore := NewMockArchiveStore()
	mockLinkStore := NewMockLinkStore()
	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelError}))

	tmpDir, err := os.MkdirTemp("", "test_worker_*")
	require.NoError(t, err)
	defer func() {
		_ = os.RemoveAll(tmpDir)
	}()

	extractorMgr := archiver.NewManager()
	contentExtractorMgr := extractors.NewManager(logger)
	mockArchiveFileStore := NewMockArchiveFileStore()

	worker := NewWorker(queue, extractorMgr, contentExtractorMgr, mockArchiveService, mockArchiveStore, mockArchiveFileStore, mockLinkStore, tmpDir, logger)

	// Add multiple links
	numJobs := 5
	for i := 0; i < numJobs; i++ {
		linkID := fmt.Sprintf("link-%d", i)
		archiveID := fmt.Sprintf("archive-%d", i)

		link := &model.Link{
			ID:     linkID,
			URL:    fmt.Sprintf("https://example.com/%d", i),
			UserID: "user-123",
		}
		mockLinkStore.AddLink(link)

		archive := &model.Archive{
			ID:     archiveID,
			LinkID: linkID,
			UserID: "user-123",
			Status: model.ArchiveStatusPending,
		}
		mockArchiveStore.AddArchive(archive)

		payload := model.ArchiveLinkPayload{
			LinkID:    linkID,
			ArchiveID: archiveID,
		}
		err = queue.Enqueue(ctx, model.JobTypeArchiveLink, payload)
		require.NoError(t, err)
	}

	// Start worker
	workerCtx, workerCancel := context.WithCancel(ctx)
	defer workerCancel()

	go func() {
		_ = worker.Start(workerCtx)
	}()

	// Wait for all jobs to be processed
	time.Sleep(1 * time.Second)

	// Verify all jobs were processed
	require.Equal(t, numJobs, mockArchiveService.GetProcessedCount())
	processedItems := mockArchiveService.GetProcessedItems()
	require.Len(t, processedItems, numJobs)
}