package e2eutil

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"testing"
	"time"

	"github.com/docker/go-connections/nat"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/wait"
)

// StartHakoContainer starts a Hako container for E2E testing.
// It builds the webapp, compiles the binary, creates a container, and returns
// the container instance and base URL for accessing the server.
func StartHakoContainer(ctx context.Context, t *testing.T) (testcontainers.Container, string, error) {
	t.Helper()

	// Get the project root (one level up from e2e)
	projectRoot, err := filepath.Abs(filepath.Join("..", ".."))
	if err != nil {
		return nil, "", fmt.Errorf("failed to get project root: %w", err)
	}

	// Build webapp
	t.Log("Building webapp...")
	cmd := exec.CommandContext(ctx, "make", "build-webapp")
	cmd.Dir = projectRoot
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		return nil, "", fmt.Errorf("failed to build webapp: %w", err)
	}

	// Build Hako binary for the container (Linux)
	t.Log("Building Hako binary...")
	binaryPath := filepath.Join(projectRoot, "e2e", "hako")
	cmd = exec.CommandContext(ctx, "go", "build", "-o", binaryPath, "./cmd/hako")
	cmd.Dir = projectRoot
	cmd.Env = append(os.Environ(), "CGO_ENABLED=0", "GOOS=linux", "GOARCH=amd64")
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		return nil, "", fmt.Errorf("failed to build binary: %w", err)
	}

	// Ensure binary is removed on cleanup
	t.Cleanup(func() {
		os.Remove(binaryPath)
	})

	// Create container request
	req := testcontainers.ContainerRequest{
		FromDockerfile: testcontainers.FromDockerfile{
			Context:    filepath.Join(projectRoot, "e2e"),
			Dockerfile: "Dockerfile.e2e",
			PrintBuildLog: true,
		},
		ExposedPorts: []string{"8080/tcp"},
		WaitingFor: wait.ForLog("Starting HTTP server").
			WithStartupTimeout(30 * time.Second),
	}

	// Start container
	t.Log("Starting Hako container...")
	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
		ContainerRequest: req,
		Started:          true,
	})
	if err != nil {
		return nil, "", fmt.Errorf("failed to start container: %w", err)
	}

	// Register cleanup
	t.Cleanup(func() {
		if err := container.Terminate(ctx); err != nil {
			t.Logf("Failed to terminate container: %v", err)
		}
	})

	// Get the mapped port
	mappedPort, err := container.MappedPort(ctx, nat.Port("8080/tcp"))
	if err != nil {
		return nil, "", fmt.Errorf("failed to get mapped port: %w", err)
	}

	// Get the host
	host, err := container.Host(ctx)
	if err != nil {
		return nil, "", fmt.Errorf("failed to get container host: %w", err)
	}

	// Construct base URL
	baseURL := fmt.Sprintf("http://%s:%s", host, mappedPort.Port())
	t.Logf("Hako container started at %s", baseURL)

	return container, baseURL, nil
}