package e2eutil

import (
	"context"
	"fmt"
	"sync"

	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/network"
)

// Shared network used by the test web server and Hako container so that
// Hako can fetch URLs from the test web server via Docker DNS.
var (
	sharedNetwork     *testcontainers.DockerNetwork
	sharedNetworkErr  error
	sharedNetworkOnce sync.Once
)

// Network alias used by the test web server inside the shared network.
const testServerAlias = "hako-testserver"

// getSharedNetwork lazily creates a shared Docker network for the test process.
// Both StartTestWebServer and StartHakoContainer attach to it so containers
// can communicate by alias.
func getSharedNetwork(ctx context.Context) (*testcontainers.DockerNetwork, error) {
	sharedNetworkOnce.Do(func() {
		sharedNetwork, sharedNetworkErr = network.New(ctx)
	})
	if sharedNetworkErr != nil {
		return nil, fmt.Errorf("failed to create shared network: %w", sharedNetworkErr)
	}
	return sharedNetwork, nil
}