//go:build !dev

package dav

import (
	"context"
	"fmt"
	"os"

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

var Service *BaseService

// defaultPostgresHost is the fallback Postgres address used when
// POSTGRES_HOST is unset — the pipeline/CI postgres service default.
const defaultPostgresHost = "127.0.0.1"

func init() {
	// Test builds wire their own pool in TestMain (testutils/testdb) — a real
	// connect here would race that and panic a bare-shell `go test`. Skip.
	if os.Getenv("GO_TESTING") != "" || os.Getenv("DAV_SKIP_INIT") != "" {
		return
	}
	if err := connect(); err != nil {
		panic("failed to initialize prod service: " + err.Error())
	}
}

func connect() error {
	host := getEnv("POSTGRES_HOST")
	if host == "" {
		host = defaultPostgresHost
	}
	dsn := fmt.Sprintf(
		"postgres://%s:%s@%s:5432/%s?timezone=UTC&require_auth=scram-sha-256",
		getEnv("POSTGRES_USER"),
		getEnv("POSTGRES_PASSWORD"),
		host,
		getEnv("POSTGRES_DB"),
	)
	pool, err := pgxpool.New(context.Background(), dsn)
	if err != nil {
		return err
	}

	Service = newBaseService(pool)
	return testDB(pool)
}

func testDB(pool *pgxpool.Pool) error {
	var n int
	err := pool.QueryRow(context.Background(), "SELECT 1").Scan(&n)
	if err != nil || n != 1 {
		return fmt.Errorf("db test failed: %w", err)
	}
	return nil
}

func getEnv(key string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	// Return empty string instead of fatal error - allows tests to run without prod env vars
	return ""
}