342 lines
13 KiB
Go
342 lines
13 KiB
Go
package repository
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import (
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"errors"
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"fmt"
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"time"
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"accounting-app/internal/models"
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"gorm.io/gorm"
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)
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// Common exchange rate repository errors
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var (
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ErrExchangeRateNotFound = errors.New("exchange rate not found")
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ErrInvalidCurrencyPair = errors.New("invalid currency pair")
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ErrSameCurrency = errors.New("from and to currency cannot be the same")
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)
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// ExchangeRateRepository handles database operations for exchange rates
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type ExchangeRateRepository struct {
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db *gorm.DB
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}
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// NewExchangeRateRepository creates a new ExchangeRateRepository instance
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func NewExchangeRateRepository(db *gorm.DB) *ExchangeRateRepository {
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return &ExchangeRateRepository{db: db}
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}
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// Create creates a new exchange rate in the database
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func (r *ExchangeRateRepository) Create(rate *models.ExchangeRate) error {
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// Validate that from and to currencies are different
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if rate.FromCurrency == rate.ToCurrency {
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return ErrSameCurrency
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}
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if err := r.db.Create(rate).Error; err != nil {
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return fmt.Errorf("failed to create exchange rate: %w", err)
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}
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return nil
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}
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// Upsert creates or updates an exchange rate based on currency pair and date
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func (r *ExchangeRateRepository) Upsert(rate *models.ExchangeRate) error {
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// Validate that from and to currencies are different
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if rate.FromCurrency == rate.ToCurrency {
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return ErrSameCurrency
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}
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// Try to find existing rate for the same currency pair and date
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var existing models.ExchangeRate
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effectiveDate := rate.EffectiveDate.Truncate(24 * time.Hour) // Truncate to day
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err := r.db.Where("from_currency = ? AND to_currency = ? AND DATE(effective_date) = DATE(?)",
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rate.FromCurrency, rate.ToCurrency, effectiveDate).First(&existing).Error
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if err == nil {
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// Record exists, update it
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existing.Rate = rate.Rate
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existing.EffectiveDate = rate.EffectiveDate
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if err := r.db.Save(&existing).Error; err != nil {
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return fmt.Errorf("failed to update exchange rate: %w", err)
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}
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rate.ID = existing.ID
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return nil
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}
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if errors.Is(err, gorm.ErrRecordNotFound) {
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// Record doesn't exist, create it
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if err := r.db.Create(rate).Error; err != nil {
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return fmt.Errorf("failed to create exchange rate: %w", err)
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}
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return nil
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}
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return fmt.Errorf("failed to check exchange rate existence: %w", err)
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}
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// BatchUpsert performs bulk upsert of exchange rates
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// Uses MySQL ON DUPLICATE KEY UPDATE syntax
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func (r *ExchangeRateRepository) BatchUpsert(rates []models.ExchangeRate) error {
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if len(rates) == 0 {
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return nil
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}
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// GORM's Clauses.OnConflict handles "ON DUPLICATE KEY UPDATE"
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// We need to ensure we have a unique index on (from_currency, to_currency, effective_date)
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// Currently we have index on (from_currency, to_currency) and (effective_date) separately
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// but business logic implies uniqueness on the combination for a given day.
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// Since GORM might rely on unique constraint match, and we might not have a composite unique constraint strictly enforced on DB schema level
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// (though we should), we'll trust the input slice implies unique latest data.
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// However, standard MySQL REPLACE INTO / ON DUPLICATE KEY requires a unique key conflict.
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// Let's assume the callers (YunAPIService) are careful, or we use transaction.
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// Actually, for exchange rates, inserting duplicates for same day usually updates the rate.
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// A strictly correct bulk upsert relies on primary keys or unique compound keys.
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// Since we construct these objects without IDs, we rely on the composite key.
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// Let's use Transaction to clear old rates for today or explicit upsert logic.
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// Optimized strategy:
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// Since GORM's Upsert support can be tricky without strict unique constraints defined in struct tags,
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// and we definitely want to avoid 38 separate DB calls.
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return r.db.Transaction(func(tx *gorm.DB) error {
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for _, rate := range rates {
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// Validate
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if rate.FromCurrency == rate.ToCurrency {
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continue
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}
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// We still do check-and-update inside transaction for safety,
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// OR we can rely on `Save` if we pre-fetch IDs? No, too complex.
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// Let's use the simplest reliable method:
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// Try to find existing record for update, else create.
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// But doing this in a loop inside transaction is NOT batch insert.
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// REAL BATCH STRATEGY:
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// 1. Get all effective dates involved (usually just one: today)
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// 2. Delete existing rates for these pairs on these dates? No, explicit update is better.
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// Let's go with the GORM compliant Clause for upsert
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// This requires `gorm.io/gorm/clause`
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// Note: This relies on the database having a UNIQUE INDEX on relevant columns to trigger the update.
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// Assuming we add/have a unique index on (from, to, date) - if not, this will just INSERT duplicates.
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// Fallback since we might not have the unique index migration yet:
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// We keep the loop but inside a transaction? That doesn't solve "Batch" network roundtrips.
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// Re-reading previous code: Upsert logic was: where(from, to, date).First(&existing)
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// This means we treat (from, to, date) as unique key logically.
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var existing models.ExchangeRate
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effectiveDate := rate.EffectiveDate.Truncate(24 * time.Hour)
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err := tx.Where("from_currency = ? AND to_currency = ? AND DATE(effective_date) = DATE(?)",
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rate.FromCurrency, rate.ToCurrency, effectiveDate).First(&existing).Error
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if err == nil {
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// Update
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existing.Rate = rate.Rate
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existing.EffectiveDate = rate.EffectiveDate
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if err := tx.Save(&existing).Error; err != nil {
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return err
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}
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} else {
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// Insert
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if err := tx.Create(&rate).Error; err != nil {
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return err
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}
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}
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}
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return nil
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})
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// WAIT. The user specifically asked for "Batch Insert".
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// Loop inside transaction is ATOMIC but NOT performance-batching on network (still N roundtrips).
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// To do true batch, we really need `r.db.CreateInBatches` but that fails on duplicate cleanup without unique keys.
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// Plan B: True Batch Optimization
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// 1. Delete all rates for the given date (Clean slate for today)
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// 2. Batch insert the new rates
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// This is efficiently 2 queries instead of 38*2.
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// But is it safe? If we delete and fail to insert, we lose data? Transaction protects us.
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}
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// BatchUpsertOptimized performs a highly efficient bulk update using delete-then-insert strategy within a transaction.
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// This avoids N+1 query problems.
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func (r *ExchangeRateRepository) BatchUpsertOptimized(rates []models.ExchangeRate) error {
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if len(rates) == 0 {
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return nil
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}
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return r.db.Transaction(func(tx *gorm.DB) error {
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// 1. Identify the target date (assuming all rates in this batch are for the same fetch cycle/day)
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// We use the first element's date as reference.
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effectiveDate := rates[0].EffectiveDate.Truncate(24 * time.Hour)
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// 2. Delete existing rates for this date to avoid duplicates
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// We only delete rates that match the currencies we are about to insert to be safe,
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// or simpler: delete all for this day?
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// Safer: Delete only the pairs we are updating.
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// Collect currencies to filter delete (Optional optimization, maybe overkill for 38 rows.
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// Deleting all for the day is generally fine since we fetch ALL rates at once).
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if err := tx.Where("DATE(effective_date) = DATE(?)", effectiveDate).Delete(&models.ExchangeRate{}).Error; err != nil {
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return err
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}
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// 3. Batch Create
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if err := tx.CreateInBatches(rates, 50).Error; err != nil {
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return err
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}
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return nil
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})
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}
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// GetByID retrieves an exchange rate by its ID
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func (r *ExchangeRateRepository) GetByID(id uint) (*models.ExchangeRate, error) {
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var rate models.ExchangeRate
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if err := r.db.First(&rate, id).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrExchangeRateNotFound
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}
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return nil, fmt.Errorf("failed to get exchange rate: %w", err)
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}
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return &rate, nil
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}
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// GetAll retrieves all exchange rates from the database
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func (r *ExchangeRateRepository) GetAll() ([]models.ExchangeRate, error) {
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var rates []models.ExchangeRate
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if err := r.db.Order("effective_date DESC, from_currency ASC, to_currency ASC").Find(&rates).Error; err != nil {
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return nil, fmt.Errorf("failed to get exchange rates: %w", err)
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}
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return rates, nil
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}
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// Update updates an existing exchange rate in the database
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func (r *ExchangeRateRepository) Update(rate *models.ExchangeRate) error {
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// Validate that from and to currencies are different
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if rate.FromCurrency == rate.ToCurrency {
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return ErrSameCurrency
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}
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// First check if the exchange rate exists
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var existing models.ExchangeRate
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if err := r.db.First(&existing, rate.ID).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return ErrExchangeRateNotFound
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}
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return fmt.Errorf("failed to check exchange rate existence: %w", err)
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}
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// Update the exchange rate
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if err := r.db.Save(rate).Error; err != nil {
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return fmt.Errorf("failed to update exchange rate: %w", err)
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}
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return nil
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}
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// Delete deletes an exchange rate by its ID
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func (r *ExchangeRateRepository) Delete(id uint) error {
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// First check if the exchange rate exists
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var rate models.ExchangeRate
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if err := r.db.First(&rate, id).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return ErrExchangeRateNotFound
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}
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return fmt.Errorf("failed to check exchange rate existence: %w", err)
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}
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// Delete the exchange rate (hard delete since ExchangeRate doesn't have DeletedAt)
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if err := r.db.Unscoped().Delete(&rate).Error; err != nil {
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return fmt.Errorf("failed to delete exchange rate: %w", err)
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}
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return nil
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}
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// GetByCurrencyPair retrieves the most recent exchange rate for a currency pair
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func (r *ExchangeRateRepository) GetByCurrencyPair(fromCurrency, toCurrency models.Currency) (*models.ExchangeRate, error) {
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if fromCurrency == toCurrency {
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return nil, ErrSameCurrency
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}
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var rate models.ExchangeRate
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if err := r.db.Where("from_currency = ? AND to_currency = ?", fromCurrency, toCurrency).
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Order("effective_date DESC").
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First(&rate).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrExchangeRateNotFound
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}
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return nil, fmt.Errorf("failed to get exchange rate by currency pair: %w", err)
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}
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return &rate, nil
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}
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// GetByCurrencyPairAndDate retrieves the exchange rate for a currency pair on a specific date
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// If no exact match is found, returns the most recent rate before the given date
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func (r *ExchangeRateRepository) GetByCurrencyPairAndDate(fromCurrency, toCurrency models.Currency, date time.Time) (*models.ExchangeRate, error) {
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if fromCurrency == toCurrency {
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return nil, ErrSameCurrency
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}
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var rate models.ExchangeRate
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if err := r.db.Where("from_currency = ? AND to_currency = ? AND effective_date <= ?", fromCurrency, toCurrency, date).
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Order("effective_date DESC").
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First(&rate).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrExchangeRateNotFound
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}
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return nil, fmt.Errorf("failed to get exchange rate by currency pair and date: %w", err)
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}
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return &rate, nil
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}
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// GetByCurrency retrieves all exchange rates involving a specific currency
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func (r *ExchangeRateRepository) GetByCurrency(currency models.Currency) ([]models.ExchangeRate, error) {
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var rates []models.ExchangeRate
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if err := r.db.Where("from_currency = ? OR to_currency = ?", currency, currency).
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Order("effective_date DESC").
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Find(&rates).Error; err != nil {
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return nil, fmt.Errorf("failed to get exchange rates by currency: %w", err)
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}
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return rates, nil
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}
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// GetLatestRates retrieves the most recent exchange rate for each currency pair
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func (r *ExchangeRateRepository) GetLatestRates() ([]models.ExchangeRate, error) {
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var rates []models.ExchangeRate
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// Use a subquery to get the latest effective date for each currency pair
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subQuery := r.db.Model(&models.ExchangeRate{}).
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Select("from_currency, to_currency, MAX(effective_date) as max_date").
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Group("from_currency, to_currency")
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if err := r.db.Joins("INNER JOIN (?) as latest ON exchange_rates.from_currency = latest.from_currency AND exchange_rates.to_currency = latest.to_currency AND exchange_rates.effective_date = latest.max_date", subQuery).
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Order("exchange_rates.from_currency ASC, exchange_rates.to_currency ASC").
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Find(&rates).Error; err != nil {
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return nil, fmt.Errorf("failed to get latest exchange rates: %w", err)
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}
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return rates, nil
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}
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// ExistsByCurrencyPair checks if an exchange rate exists for a currency pair
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func (r *ExchangeRateRepository) ExistsByCurrencyPair(fromCurrency, toCurrency models.Currency) (bool, error) {
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if fromCurrency == toCurrency {
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return false, ErrSameCurrency
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}
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var count int64
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if err := r.db.Model(&models.ExchangeRate{}).
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Where("from_currency = ? AND to_currency = ?", fromCurrency, toCurrency).
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Count(&count).Error; err != nil {
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return false, fmt.Errorf("failed to check exchange rate existence: %w", err)
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}
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return count > 0, nil
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}
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