package repository

import (
	"context"
	"errors"
	"time"

	"github.com/google/uuid"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"

	"tm/internal/domain"
	"tm/pkg/logger"
)

// CompanyRepositoryImpl implements the CompanyRepository interface
type CompanyRepositoryImpl struct {
	collection *mongo.Collection
	logger     logger.Logger
}

// NewCompanyRepository creates a new company repository
func NewCompanyRepository(db *mongo.Database, logger logger.Logger) domain.CompanyRepository {
	collection := db.Collection("companies")

	// Create indexes
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	// Name index
	nameIndex := mongo.IndexModel{
		Keys: bson.D{{"name", 1}},
	}

	// Created at index
	createdAtIndex := mongo.IndexModel{
		Keys: bson.D{{"created_at", -1}},
	}

	_, err := collection.Indexes().CreateMany(ctx, []mongo.IndexModel{
		nameIndex,
		createdAtIndex,
	})

	if err != nil {
		logger.Warn("Failed to create company indexes", map[string]interface{}{
			"error": err.Error(),
		})
	}

	return &CompanyRepositoryImpl{
		collection: collection,
		logger:     logger,
	}
}

// Create creates a new company
func (r *CompanyRepositoryImpl) Create(ctx context.Context, company *domain.Company) error {
	// Set created/updated timestamps
	now := time.Now()
	company.CreatedAt = now
	company.UpdatedAt = now

	// Insert company
	_, err := r.collection.InsertOne(ctx, company)
	if err != nil {
		if mongo.IsDuplicateKeyError(err) {
			return errors.New("company already exists")
		}
		r.logger.Error("Failed to create company", map[string]interface{}{
			"error":      err.Error(),
			"company_id": company.ID.String(),
		})
		return err
	}

	r.logger.Info("Company created successfully", map[string]interface{}{
		"company_id": company.ID.String(),
		"name":       company.Name,
	})

	return nil
}

// GetByID retrieves a company by ID
func (r *CompanyRepositoryImpl) GetByID(ctx context.Context, id uuid.UUID) (*domain.Company, error) {
	var company domain.Company

	filter := bson.M{"_id": id}
	err := r.collection.FindOne(ctx, filter).Decode(&company)

	if err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, errors.New("company not found")
		}
		r.logger.Error("Failed to get company by ID", map[string]interface{}{
			"error":      err.Error(),
			"company_id": id.String(),
		})
		return nil, err
	}

	return &company, nil
}

// Update updates a company
func (r *CompanyRepositoryImpl) Update(ctx context.Context, company *domain.Company) error {
	// Set updated timestamp
	company.UpdatedAt = time.Now()

	filter := bson.M{"_id": company.ID}
	update := bson.M{"$set": company}

	result, err := r.collection.UpdateOne(ctx, filter, update)
	if err != nil {
		r.logger.Error("Failed to update company", map[string]interface{}{
			"error":      err.Error(),
			"company_id": company.ID.String(),
		})
		return err
	}

	if result.MatchedCount == 0 {
		return errors.New("company not found")
	}

	r.logger.Info("Company updated successfully", map[string]interface{}{
		"company_id": company.ID.String(),
		"name":       company.Name,
	})

	return nil
}

// Delete deletes a company
func (r *CompanyRepositoryImpl) Delete(ctx context.Context, id uuid.UUID) error {
	filter := bson.M{"_id": id}

	result, err := r.collection.DeleteOne(ctx, filter)
	if err != nil {
		r.logger.Error("Failed to delete company", map[string]interface{}{
			"error":      err.Error(),
			"company_id": id.String(),
		})
		return err
	}

	if result.DeletedCount == 0 {
		return errors.New("company not found")
	}

	r.logger.Info("Company deleted successfully", map[string]interface{}{
		"company_id": id.String(),
	})

	return nil
}

// List retrieves companies with pagination
func (r *CompanyRepositoryImpl) List(ctx context.Context, limit, offset int) ([]*domain.Company, error) {
	var companies []*domain.Company

	// Build options
	opts := options.Find()
	opts.SetLimit(int64(limit))
	opts.SetSkip(int64(offset))
	opts.SetSort(bson.D{{"created_at", -1}}) // Sort by created_at desc

	cursor, err := r.collection.Find(ctx, bson.M{}, opts)
	if err != nil {
		r.logger.Error("Failed to list companies", map[string]interface{}{
			"error":  err.Error(),
			"limit":  limit,
			"offset": offset,
		})
		return nil, err
	}
	defer cursor.Close(ctx)

	if err = cursor.All(ctx, &companies); err != nil {
		r.logger.Error("Failed to decode companies", map[string]interface{}{
			"error": err.Error(),
		})
		return nil, err
	}

	return companies, nil
}

// UpdateInterests updates company interests
func (r *CompanyRepositoryImpl) UpdateInterests(ctx context.Context, id uuid.UUID, interests *domain.InterestProfile) error {
	filter := bson.M{"_id": id}
	update := bson.M{
		"$set": bson.M{
			"interests":  interests,
			"updated_at": time.Now(),
		},
	}

	result, err := r.collection.UpdateOne(ctx, filter, update)
	if err != nil {
		r.logger.Error("Failed to update company interests", map[string]interface{}{
			"error":      err.Error(),
			"company_id": id.String(),
		})
		return err
	}

	if result.MatchedCount == 0 {
		return errors.New("company not found")
	}

	r.logger.Info("Company interests updated successfully", map[string]interface{}{
		"company_id": id.String(),
	})

	return nil
}