tsk-5: Add contact (#7)

Closes #5

Reviewed-on: phoenix/textsender-api#7
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/store/contact_store.go

@@ -0,0 +1,115 @@
+package store
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.kundeng.us/phoenix/textsender-models/pkg/contact"
+)
+
+type ContactStore interface {
+	CreateContact(ctx context.Context, con *contact.Contact) error
+	GetContactByID(ctx context.Context, id uuid.UUID) (*contact.Contact, error)
+	GetContactByPhone(ctx context.Context, phone string, userId uuid.UUID) (*contact.Contact, error)
+	GetAllContacts(ctx context.Context) ([]*contact.Contact, error)
+	ContactExists(ctx context.Context, phone string, userId uuid.UUID) (bool, error)
+}
+
+type PGContactStore struct {
+	db *pgxpool.Pool
+}
+
+func NewContactStore(db *pgxpool.Pool) *PGContactStore {
+	return &PGContactStore{db: db}
+}
+
+func (s *PGContactStore) CreateContact(ctx context.Context, con *contact.Contact) error {
+	query := `
+		INSERT INTO contacts (phone_number, user_id)
+		VALUES ($1, $2)
+		RETURNING id, phone_number, user_id
+	`
+
+	return s.db.QueryRow(ctx, query, con.PhoneNumber, con.UserId).Scan(
+		&con.Id, &con.PhoneNumber, &con.UserId,
+	)
+}
+
+func (s *PGContactStore) GetContactByID(ctx context.Context, id uuid.UUID) (*contact.Contact, error) {
+	query := `SELECT id, phone_number, user_id FROM contacts WHERE id = $1`
+
+	var con contact.Contact
+	err := s.db.QueryRow(ctx, query, id).Scan(
+		&con.Id, &con.PhoneNumber, &con.UserId,
+	)
+
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("getting contact by ID: %w", err)
+	}
+
+	return &con, nil
+}
+
+func (s *PGContactStore) GetContactByPhone(ctx context.Context, phone string, userId uuid.UUID) (*contact.Contact, error) {
+	query := `SELECT id, phone_number, user_id FROM contacts WHERE phone_number = $1 AND user_id = $2`
+
+	var con contact.Contact
+	err := s.db.QueryRow(ctx, query, phone, userId).Scan(
+		&con.Id, &con.PhoneNumber, &con.UserId,
+	)
+
+	if err == pgx.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("getting contact by phone and User ID: %w", err)
+	}
+
+	return &con, nil
+}
+
+func (s *PGContactStore) GetAllContacts(ctx context.Context) ([]*contact.Contact, error) {
+	query := `SELECT id, phone_number, user_id FROM contacts`
+
+	rows, err := s.db.Query(ctx, query)
+	if err != nil {
+		return nil, fmt.Errorf("querying all contacts: %w", err)
+	}
+	defer rows.Close()
+
+	var cons []*contact.Contact
+	for rows.Next() {
+		var con contact.Contact
+		if err := rows.Scan(
+			&con.Id, &con.PhoneNumber, &con.UserId,
+		); err != nil {
+			return nil, fmt.Errorf("scanning contact row: %w", err)
+		}
+		cons = append(cons, &con)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("iterating contact rows: %w", err)
+	}
+
+	return cons, nil
+}
+
+func (s *PGContactStore) ContactExists(ctx context.Context, phone string, userId uuid.UUID) (bool, error) {
+	query := `SELECT EXISTS(SELECT 1 FROM contacts WHERE phone_number = $1 AND user_id = $2)`
+
+	var exists bool
+	err := s.db.QueryRow(ctx, query, phone, userId).Scan(&exists)
+	if err != nil {
+		return false, fmt.Errorf("checking if contact exists: %w", err)
+	}
+
+	return exists, nil
+}