package service

import (
	"context"
	"database/sql"
	"fmt"

	"boc/repository"
)

// SalesService handles business logic for sales operations
type SalesService struct {
	repo *repository.SalesRepository
	db   *sql.DB
}

func NewSalesService(db *sql.DB) *SalesService {
	return &SalesService{
		repo: repository.NewSalesRepository(db),
		db:   db,
	}
}

// ListDeals returns all deals filtered by status
func (s *SalesService) ListDeals(ctx context.Context, status string) ([]repository.Deal, error) {
	return s.repo.ListDeals(ctx, status)
}

// GetDeal returns a single deal by ID
func (s *SalesService) GetDeal(ctx context.Context, id string) (*repository.Deal, error) {
	return s.repo.GetDeal(ctx, id)
}

// CreateDeal creates a new deal with validation
func (s *SalesService) CreateDeal(ctx context.Context, d *repository.Deal) error {
	if d.Name == "" {
		return fmt.Errorf("deal name is required")
	}
	if d.CustomerID == "" {
		return fmt.Errorf("customer ID is required")
	}
	if d.Value <= 0 {
		return fmt.Errorf("deal value must be positive")
	}
	if d.Status == "" {
		d.Status = "open"
	}
	if d.Stage == "" {
		d.Stage = "discovery"
	}
	if d.Currency == "" {
		d.Currency = "USD"
	}
	return s.repo.CreateDeal(ctx, d)
}

// UpdateDeal updates an existing deal
func (s *SalesService) UpdateDeal(ctx context.Context, id string, d *repository.Deal) error {
	if d.Name == "" {
		return fmt.Errorf("deal name is required")
	}
	return s.repo.UpdateDeal(ctx, id, d)
}

// ListProducts returns all active products
func (s *SalesService) ListProducts(ctx context.Context) ([]repository.Product, error) {
	return s.repo.ListProducts(ctx)
}

// GetMRR calculates monthly recurring revenue
func (s *SalesService) GetMRR(ctx context.Context) (float64, error) {
	return s.repo.GetMRR(ctx)
}

// GetARR calculates annual recurring revenue
func (s *SalesService) GetARR(ctx context.Context) (float64, error) {
	return s.repo.GetARR(ctx)
}