package db

import (
	"context"
	_ "embed"
	"fmt"
	"time"

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

//go:embed schema.sql
var schema string

func NewPool(ctx context.Context, dsn string) (*pgxpool.Pool, error) {
	cfg, err := pgxpool.ParseConfig(dsn)
	if err != nil {
		return nil, fmt.Errorf("parse dsn: %w", err)
	}
	cfg.MaxConns = 25
	cfg.MinConns = 2
	cfg.MaxConnLifetime = 15 * time.Minute
	cfg.MaxConnIdleTime = 5 * time.Minute

	pool, err := pgxpool.NewWithConfig(ctx, cfg)
	if err != nil {
		return nil, fmt.Errorf("create pool: %w", err)
	}
	if err := pool.Ping(ctx); err != nil {
		return nil, fmt.Errorf("ping db: %w", err)
	}
	return pool, nil
}

// InitSchema applies the embedded schema.sql (idempotent via IF NOT EXISTS).
func InitSchema(ctx context.Context, pool *pgxpool.Pool) error {
	if _, err := pool.Exec(ctx, schema); err != nil {
		return fmt.Errorf("init schema: %w", err)
	}
	return nil
}