package pgstore

import (
	"context"
	"fmt"

	"github.com/jackc/pgx/v5/pgxpool"
)

// Store is the platform's database handle.
type Store struct {
	pool *pgxpool.Pool
}

// Open builds the pool. It does NOT connect: pgxpool dials lazily, so a database that is down at
// boot makes the service unready rather than dead — readiness is the gate, not the process.
func Open(ctx context.Context, dsn string) (*Store, error) {
	cfg, err := pgxpool.ParseConfig(dsn)
	if err != nil {
		return nil, fmt.Errorf("pgstore: parse dsn: %w", err)
	}
	pool, err := pgxpool.NewWithConfig(ctx, cfg)
	if err != nil {
		return nil, fmt.Errorf("pgstore: pool: %w", err)
	}
	return &Store{pool: pool}, nil
}

// Ping reports whether the database is reachable; it backs /readyz.
func (s *Store) Ping(ctx context.Context) error {
	if err := s.pool.Ping(ctx); err != nil {
		return fmt.Errorf("pgstore: ping: %w", err)
	}
	return nil
}

func (s *Store) Close() { s.pool.Close() }