package postgres_test

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"net/url"
	"testing"

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

func isolatedExternalIntegrationDatabaseURL(t *testing.T, databaseURL string) string {
	t.Helper()
	if databaseURL == "" {
		return ""
	}
	parsed, err := url.Parse(databaseURL)
	if err != nil || parsed.Scheme == "" || parsed.Host == "" {
		t.Fatalf("TEST_DATABASE_URL must be a PostgreSQL URL: %v", err)
	}
	digest := sha256.Sum256([]byte(t.Name()))
	schema := "kgtestx_" + hex.EncodeToString(digest[:8])
	ctx := context.Background()
	admin, err := pgxpool.New(ctx, databaseURL)
	if err != nil {
		t.Fatalf("connect integration database: %v", err)
	}
	defer admin.Close()
	if _, err := admin.Exec(ctx, "CREATE SCHEMA "+schema); err != nil {
		t.Fatalf("create isolated integration schema: %v", err)
	}
	t.Cleanup(func() {
		cleanup, err := pgxpool.New(context.Background(), databaseURL)
		if err == nil {
			_, _ = cleanup.Exec(context.Background(), "DROP SCHEMA IF EXISTS "+schema+" CASCADE")
			cleanup.Close()
		}
	})
	query := parsed.Query()
	query.Set("search_path", schema)
	parsed.RawQuery = query.Encode()
	return parsed.String()
}