package linguistics

import (
	"context"
	"fmt"
	"tercul/internal/domain"

	"gorm.io/gorm"
	"tercul/internal/platform/log"
)

// AnalysisRepository defines the interface for database operations related to analysis
type AnalysisRepository interface {
	// StoreAnalysisResults stores analysis results in the database
	StoreAnalysisResults(ctx context.Context, workID uint, result *AnalysisResult) error

	// GetWorkContent retrieves content for a work from translations
	GetWorkContent(ctx context.Context, workID uint, language string) (string, error)

	// StoreWorkAnalysis stores work-specific analysis results
	StoreWorkAnalysis(ctx context.Context, workID uint, textMetadata *domain.TextMetadata,
		readabilityScore *domain.ReadabilityScore, languageAnalysis *domain.LanguageAnalysis) error

	// GetWorkByID fetches a work by ID
	GetWorkByID(ctx context.Context, workID uint) (*domain.Work, error)

	// GetAnalysisData fetches persisted analysis data for a work
	GetAnalysisData(ctx context.Context, workID uint) (*domain.TextMetadata, *domain.ReadabilityScore, *domain.LanguageAnalysis, error)
}

// GORMAnalysisRepository implements AnalysisRepository using GORM
type GORMAnalysisRepository struct {
	db *gorm.DB
}

// NewGORMAnalysisRepository creates a new GORMAnalysisRepository
func NewGORMAnalysisRepository(db *gorm.DB) *GORMAnalysisRepository {
	return &GORMAnalysisRepository{db: db}
}

// StoreAnalysisResults stores analysis results in the database
func (r *GORMAnalysisRepository) StoreAnalysisResults(ctx context.Context, workID uint, result *AnalysisResult) error {
	logger := log.FromContext(ctx).With("workID", workID)
	if result == nil {
		return fmt.Errorf("analysis result cannot be nil")
	}

	// Determine language from the work record to avoid hardcoded defaults
	var workRecord domain.Work
	if err := r.db.WithContext(ctx).First(&workRecord, workID).Error; err != nil {
		logger.Error(err, "Failed to fetch work for language")
		return fmt.Errorf("failed to fetch work for language: %w", err)
	}

	// Create text metadata
	textMetadata := &domain.TextMetadata{
		WorkID:                workID,
		Language:              workRecord.Language,
		WordCount:             result.WordCount,
		SentenceCount:         result.SentenceCount,
		ParagraphCount:        result.ParagraphCount,
		AverageWordLength:     result.AvgWordLength,
		AverageSentenceLength: result.AvgSentenceLength,
	}

	// Create readability score
	readabilityScore := &domain.ReadabilityScore{
		WorkID:   workID,
		Language: workRecord.Language,
		Score:    result.ReadabilityScore,
		Method:   result.ReadabilityMethod,
	}

	// Create language analysis
	languageAnalysis := &domain.LanguageAnalysis{
		WorkID:   workID,
		Language: workRecord.Language,
		Analysis: domain.JSONB{
			"sentiment": result.Sentiment,
			"keywords":  extractKeywordsAsJSON(result.Keywords),
			"topics":    extractTopicsAsJSON(result.Topics),
		},
	}

	return r.StoreWorkAnalysis(ctx, workID, textMetadata, readabilityScore, languageAnalysis)
}

// GetWorkContent retrieves content for a work from translations
func (r *GORMAnalysisRepository) GetWorkContent(ctx context.Context, workID uint, language string) (string, error) {
	logger := log.FromContext(ctx).With("workID", workID)
	// First, get the work to determine its language
	var workRecord domain.Work
	if err := r.db.First(&workRecord, workID).Error; err != nil {
		logger.Error(err, "Failed to fetch work for content retrieval")
		return "", fmt.Errorf("failed to fetch work: %w", err)
	}

	// Try to get content from translations in order of preference:
	// 1. Original language translation
	// 2. Work's language translation
	// 3. Any available translation

	var translation domain.Translation

	// Try original language first
	if err := r.db.Where("translatable_type = ? AND translatable_id = ? AND is_original_language = ?",
		"works", workID, true).First(&translation).Error; err == nil {
		return translation.Content, nil
	}

	// Try work's language
	if err := r.db.Where("translatable_type = ? AND translatable_id = ? AND language = ?",
		"works", workID, workRecord.Language).First(&translation).Error; err == nil {
		return translation.Content, nil
	}

	// Try any available translation
	if err := r.db.Where("translatable_type = ? AND translatable_id = ?",
		"works", workID).First(&translation).Error; err == nil {
		return translation.Content, nil
	}

	return "", fmt.Errorf("no content found for work %d", workID)
}

// GetWorkByID fetches a work by ID
func (r *GORMAnalysisRepository) GetWorkByID(ctx context.Context, workID uint) (*domain.Work, error) {
	var workRecord domain.Work
	if err := r.db.WithContext(ctx).First(&workRecord, workID).Error; err != nil {
		return nil, fmt.Errorf("failed to fetch work: %w", err)
	}
	return &workRecord, nil
}

// GetAnalysisData fetches persisted analysis data for a work
func (r *GORMAnalysisRepository) GetAnalysisData(ctx context.Context, workID uint) (*domain.TextMetadata, *domain.ReadabilityScore, *domain.LanguageAnalysis, error) {
	logger := log.FromContext(ctx).With("workID", workID)
	var textMetadata domain.TextMetadata
	var readabilityScore domain.ReadabilityScore
	var languageAnalysis domain.LanguageAnalysis

	if err := r.db.WithContext(ctx).Where("work_id = ?", workID).First(&textMetadata).Error; err != nil {
		logger.Warn("No text metadata found for work")
	}

	if err := r.db.WithContext(ctx).Where("work_id = ?", workID).First(&readabilityScore).Error; err != nil {
		logger.Warn("No readability score found for work")
	}

	if err := r.db.WithContext(ctx).Where("work_id = ?", workID).First(&languageAnalysis).Error; err != nil {
		logger.Warn("No language analysis found for work")
		return nil, nil, nil, err
	}

	return &textMetadata, &readabilityScore, &languageAnalysis, nil
}

// StoreWorkAnalysis stores work-specific analysis results
func (r *GORMAnalysisRepository) StoreWorkAnalysis(ctx context.Context, workID uint,
	textMetadata *domain.TextMetadata, readabilityScore *domain.ReadabilityScore,
	languageAnalysis *domain.LanguageAnalysis) error {
	logger := log.FromContext(ctx).With("workID", workID)
	// Use a transaction to ensure all data is stored atomically
	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		// Store text metadata
		if textMetadata != nil {
			if err := tx.Where("work_id = ?", workID).Delete(&domain.TextMetadata{}).Error; err != nil {
				logger.Error(err, "Failed to delete existing text metadata")
				return fmt.Errorf("failed to delete existing text metadata: %w", err)
			}

			if err := tx.Create(textMetadata).Error; err != nil {
				logger.Error(err, "Failed to store text metadata")
				return fmt.Errorf("failed to store text metadata: %w", err)
			}
		}

		// Store readability score
		if readabilityScore != nil {
			if err := tx.Where("work_id = ?", workID).Delete(&domain.ReadabilityScore{}).Error; err != nil {
				logger.Error(err, "Failed to delete existing readability score")
				return fmt.Errorf("failed to delete existing readability score: %w", err)
			}

			if err := tx.Create(readabilityScore).Error; err != nil {
				logger.Error(err, "Failed to store readability score")
				return fmt.Errorf("failed to store readability score: %w", err)
			}
		}

		// Store language analysis
		if languageAnalysis != nil {
			if err := tx.Where("work_id = ?", workID).Delete(&domain.LanguageAnalysis{}).Error; err != nil {
				logger.Error(err, "Failed to delete existing language analysis")
				return fmt.Errorf("failed to delete existing language analysis: %w", err)
			}

			if err := tx.Create(languageAnalysis).Error; err != nil {
				logger.Error(err, "Failed to store language analysis")
				return fmt.Errorf("failed to store language analysis: %w", err)
			}
		}

		logger.Info("Successfully stored analysis results")

		return nil
	})
}

// Helper functions for data conversion
func extractKeywordsAsJSON(keywords []Keyword) domain.JSONB {
	if len(keywords) == 0 {
		return domain.JSONB{}
	}

	keywordData := make([]map[string]interface{}, len(keywords))
	for i, kw := range keywords {
		keywordData[i] = map[string]interface{}{
			"text":      kw.Text,
			"relevance": kw.Relevance,
		}
	}

	return domain.JSONB{"keywords": keywordData}
}

func extractTopicsAsJSON(topics []Topic) domain.JSONB {
	if len(topics) == 0 {
		return domain.JSONB{}
	}

	topicData := make([]map[string]interface{}, len(topics))
	for i, topic := range topics {
		topicData[i] = map[string]interface{}{
			"name":      topic.Name,
			"relevance": topic.Relevance,
		}
	}

	return domain.JSONB{"topics": topicData}
}