package import_service

import (
	"context"
	"fmt"
	"log"

	"git.leaktechnologies.dev/stu/Goondex/internal/db"
	"git.leaktechnologies.dev/stu/Goondex/internal/model"
	"git.leaktechnologies.dev/stu/Goondex/internal/scraper/tpdb"
)

// ProgressUpdate represents a progress update during import
type ProgressUpdate struct {
	EntityType string  `json:"entity_type"`
	Current    int     `json:"current"`
	Total      int     `json:"total"`
	Percent    float64 `json:"percent"`
	Message    string  `json:"message"`
}

// ProgressCallback is called when progress is made
type ProgressCallback func(update ProgressUpdate)

// Service handles bulk import operations
type Service struct {
	db      *db.DB
	scraper *tpdb.Scraper
}

// NewService creates a new import service
func NewService(database *db.DB, scraper *tpdb.Scraper) *Service {
	return &Service{
		db:      database,
		scraper: scraper,
	}
}

// ImportResult contains the results of an import operation
type ImportResult struct {
	EntityType string
	Imported   int
	Failed     int
	Total      int
}

// BulkImportAllPerformers imports all performers from TPDB
func (s *Service) BulkImportAllPerformers(ctx context.Context) (*ImportResult, error) {
	return s.BulkImportAllPerformersWithProgress(ctx, nil)
}

// BulkImportAllPerformersWithProgress imports all performers from TPDB with progress updates
func (s *Service) BulkImportAllPerformersWithProgress(ctx context.Context, progress ProgressCallback) (*ImportResult, error) {
	result := &ImportResult{
		EntityType: "performers",
	}

	performerStore := db.NewPerformerStore(s.db)

	page := 1
	for {
		performers, meta, err := s.scraper.ListPerformers(ctx, page)
		if err != nil {
			return result, fmt.Errorf("failed to fetch page %d: %w", page, err)
		}

		// Update total on first page
		if meta != nil && page == 1 {
			result.Total = meta.Total
		}

		// Import each performer
		for _, performer := range performers {
			if err := performerStore.Upsert(&performer); err != nil {
				log.Printf("Failed to import performer %s: %v", performer.Name, err)
				result.Failed++
			} else {
				result.Imported++
			}

			// Send progress update
			if progress != nil && result.Total > 0 {
				progress(ProgressUpdate{
					EntityType: "performers",
					Current:    result.Imported,
					Total:      result.Total,
					Percent:    float64(result.Imported) / float64(result.Total) * 100,
					Message:    fmt.Sprintf("Imported %d/%d performers", result.Imported, result.Total),
				})
			}
		}

		log.Printf("Imported page %d/%d of performers (%d/%d total)", page, meta.LastPage, result.Imported, result.Total)

		// Check if we've reached the last page
		if meta == nil || page >= meta.LastPage {
			break
		}

		page++
	}

	return result, nil
}

// BulkImportAllStudios imports all studios from TPDB
func (s *Service) BulkImportAllStudios(ctx context.Context) (*ImportResult, error) {
	return s.BulkImportAllStudiosWithProgress(ctx, nil)
}

// BulkImportAllStudiosWithProgress imports all studios from TPDB with progress updates
func (s *Service) BulkImportAllStudiosWithProgress(ctx context.Context, progress ProgressCallback) (*ImportResult, error) {
	result := &ImportResult{
		EntityType: "studios",
	}

	studioStore := db.NewStudioStore(s.db)

	page := 1
	for {
		studios, meta, err := s.scraper.ListStudios(ctx, page)
		if err != nil {
			return result, fmt.Errorf("failed to fetch page %d: %w", page, err)
		}

		// Update total on first page
		if meta != nil && page == 1 {
			result.Total = meta.Total
		}

		// Import each studio
		for _, studio := range studios {
			if err := studioStore.Upsert(&studio); err != nil {
				log.Printf("Failed to import studio %s: %v", studio.Name, err)
				result.Failed++
			} else {
				result.Imported++
			}

			// Send progress update
			if progress != nil && result.Total > 0 {
				progress(ProgressUpdate{
					EntityType: "studios",
					Current:    result.Imported,
					Total:      result.Total,
					Percent:    float64(result.Imported) / float64(result.Total) * 100,
					Message:    fmt.Sprintf("Imported %d/%d studios", result.Imported, result.Total),
				})
			}
		}

		log.Printf("Imported page %d/%d of studios (%d/%d total)", page, meta.LastPage, result.Imported, result.Total)

		// Check if we've reached the last page
		if meta == nil || page >= meta.LastPage {
			break
		}

		page++
	}

	return result, nil
}

// BulkImportAllScenes imports all scenes from TPDB
func (s *Service) BulkImportAllScenes(ctx context.Context) (*ImportResult, error) {
	return s.BulkImportAllScenesWithProgress(ctx, nil)
}

// BulkImportAllScenesWithProgress imports all scenes from TPDB with progress updates
func (s *Service) BulkImportAllScenesWithProgress(ctx context.Context, progress ProgressCallback) (*ImportResult, error) {
	result := &ImportResult{
		EntityType: "scenes",
	}

	performerStore := db.NewPerformerStore(s.db)
	studioStore := db.NewStudioStore(s.db)
	sceneStore := db.NewSceneStore(s.db)
	tagStore := db.NewTagStore(s.db)

	page := 1
	for {
		scenes, meta, err := s.scraper.ListScenes(ctx, page)
		if err != nil {
			return result, fmt.Errorf("failed to fetch page %d: %w", page, err)
		}

		// Update total on first page
		if meta != nil && page == 1 {
			result.Total = meta.Total
		}

		// Import each scene with its performers and tags
		for _, scene := range scenes {
			// First import performers from the scene
			for _, performer := range scene.Performers {
				if err := performerStore.Upsert(&performer); err != nil {
					log.Printf("Failed to import performer %s for scene %s: %v", performer.Name, scene.Title, err)
				}
			}

			// Import studio if present
			if scene.Studio != nil {
				if err := studioStore.Upsert(scene.Studio); err != nil {
					log.Printf("Failed to import studio %s for scene %s: %v", scene.Studio.Name, scene.Title, err)
				}
				// Look up the studio ID
				existingStudio, err := studioStore.GetBySourceID("tpdb", scene.Studio.SourceID)
				if err == nil && existingStudio != nil {
					scene.StudioID = &existingStudio.ID
				}
			}

			// Import tags
			for _, tag := range scene.Tags {
				if err := tagStore.Upsert(&tag); err != nil {
					log.Printf("Failed to import tag %s for scene %s: %v", tag.Name, scene.Title, err)
				}
			}

			// Import the scene
			if err := sceneStore.Upsert(&scene); err != nil {
				log.Printf("Failed to import scene %s: %v", scene.Title, err)
				result.Failed++
				continue
			}

			// Get the scene ID
			existingScene, err := sceneStore.GetBySourceID("tpdb", scene.SourceID)
			if err != nil {
				log.Printf("Failed to lookup scene %s after import: %v", scene.Title, err)
				result.Failed++
				continue
			}

			// Link performers to scene
			for _, performer := range scene.Performers {
				existingPerformer, err := performerStore.GetBySourceID("tpdb", performer.SourceID)
				if err == nil && existingPerformer != nil {
					if err := sceneStore.AddPerformer(existingScene.ID, existingPerformer.ID); err != nil {
						log.Printf("Failed to link performer %s to scene %s: %v", performer.Name, scene.Title, err)
					}
				}
			}

			// Link tags to scene
			for _, tag := range scene.Tags {
				existingTag, err := tagStore.GetBySourceID("tpdb", tag.SourceID)
				if err == nil && existingTag != nil {
					if err := sceneStore.AddTag(existingScene.ID, existingTag.ID); err != nil {
						log.Printf("Failed to link tag %s to scene %s: %v", tag.Name, scene.Title, err)
					}
				}
			}

			result.Imported++

			// Send progress update
			if progress != nil && result.Total > 0 {
				progress(ProgressUpdate{
					EntityType: "scenes",
					Current:    result.Imported,
					Total:      result.Total,
					Percent:    float64(result.Imported) / float64(result.Total) * 100,
					Message:    fmt.Sprintf("Imported %d/%d scenes", result.Imported, result.Total),
				})
			}
		}

		log.Printf("Imported page %d/%d of scenes (%d/%d total)", page, meta.LastPage, result.Imported, result.Total)

		// Check if we've reached the last page
		if meta == nil || page >= meta.LastPage {
			break
		}

		page++
	}

	return result, nil
}

// BulkImportAll imports all data from TPDB (performers, studios, scenes)
func (s *Service) BulkImportAll(ctx context.Context) ([]ImportResult, error) {
	var results []ImportResult

	log.Println("Starting bulk import of all TPDB data...")

	// Import performers first
	log.Println("Importing performers...")
	performerResult, err := s.BulkImportAllPerformers(ctx)
	if err != nil {
		return results, fmt.Errorf("failed to import performers: %w", err)
	}
	results = append(results, *performerResult)

	// Import studios
	log.Println("Importing studios...")
	studioResult, err := s.BulkImportAllStudios(ctx)
	if err != nil {
		return results, fmt.Errorf("failed to import studios: %w", err)
	}
	results = append(results, *studioResult)

	// Import scenes (with their performers and tags)
	log.Println("Importing scenes...")
	sceneResult, err := s.BulkImportAllScenes(ctx)
	if err != nil {
		return results, fmt.Errorf("failed to import scenes: %w", err)
	}
	results = append(results, *sceneResult)

	log.Println("Bulk import complete!")

	return results, nil
}

// ImportScene imports a single scene with all its related data
func (s *Service) ImportScene(ctx context.Context, scene *model.Scene) error {
	performerStore := db.NewPerformerStore(s.db)
	studioStore := db.NewStudioStore(s.db)
	sceneStore := db.NewSceneStore(s.db)
	tagStore := db.NewTagStore(s.db)

	// Import performers first
	for _, performer := range scene.Performers {
		if err := performerStore.Upsert(&performer); err != nil {
			return fmt.Errorf("failed to import performer %s: %w", performer.Name, err)
		}
	}

	// Import tags
	for _, tag := range scene.Tags {
		if err := tagStore.Upsert(&tag); err != nil {
			return fmt.Errorf("failed to import tag %s: %w", tag.Name, err)
		}
	}

	// Import studio if present
	if scene.Studio != nil {
		if err := studioStore.Upsert(scene.Studio); err != nil {
			return fmt.Errorf("failed to import studio %s: %w", scene.Studio.Name, err)
		}
		// Look up the studio ID
		existingStudio, err := studioStore.GetBySourceID("tpdb", scene.Studio.SourceID)
		if err == nil && existingStudio != nil {
			scene.StudioID = &existingStudio.ID
		}
	}

	// Import the scene
	if err := sceneStore.Upsert(scene); err != nil {
		return fmt.Errorf("failed to import scene: %w", err)
	}

	// Get the scene ID
	existingScene, err := sceneStore.GetBySourceID("tpdb", scene.SourceID)
	if err != nil {
		return fmt.Errorf("failed to lookup scene after import: %w", err)
	}

	// Link performers to scene
	for _, performer := range scene.Performers {
		existingPerformer, err := performerStore.GetBySourceID("tpdb", performer.SourceID)
		if err == nil && existingPerformer != nil {
			if err := sceneStore.AddPerformer(existingScene.ID, existingPerformer.ID); err != nil {
				return fmt.Errorf("failed to link performer %s: %w", performer.Name, err)
			}
		}
	}

	// Link tags to scene
	for _, tag := range scene.Tags {
		existingTag, err := tagStore.GetBySourceID("tpdb", tag.SourceID)
		if err == nil && existingTag != nil {
			if err := sceneStore.AddTag(existingScene.ID, existingTag.ID); err != nil {
				return fmt.Errorf("failed to link tag %s: %w", tag.Name, err)
			}
		}
	}

	return nil
}