package staticsite

import (
	"context"
	"fmt"
	"io"
	"log/slog"
	"os"
	"path/filepath"
	"strconv"
	"time"

	"github.com/moby/moby/api/types/mount"

	"github.com/alexei/tinyforge/internal/crypto"
	"github.com/alexei/tinyforge/internal/docker"
	"github.com/alexei/tinyforge/internal/events"
	"github.com/alexei/tinyforge/internal/proxy"
	"github.com/alexei/tinyforge/internal/staticsite/deno"
	"github.com/alexei/tinyforge/internal/store"
)

// Manager orchestrates the static site deployment pipeline.
type Manager struct {
	store         *store.Store
	docker        *docker.Client
	proxyProvider proxy.Provider
	eventBus      *events.Bus
	encKey        [32]byte
}

// NewManager creates a new static site manager.
func NewManager(
	st *store.Store,
	dockerClient *docker.Client,
	proxyProvider proxy.Provider,
	eventBus *events.Bus,
	encKey [32]byte,
) *Manager {
	return &Manager{
		store:         st,
		docker:        dockerClient,
		proxyProvider: proxyProvider,
		eventBus:      eventBus,
		encKey:        encKey,
	}
}

// SetProxyProvider updates the proxy provider at runtime.
func (m *Manager) SetProxyProvider(provider proxy.Provider) {
	m.proxyProvider = provider
}

// Deploy fetches content from Gitea and deploys a static site container.
// If force is true, skips the "no changes" check and always rebuilds/redeploys.
func (m *Manager) Deploy(ctx context.Context, siteID string, force bool) error {
	site, err := m.store.GetStaticSiteByID(siteID)
	if err != nil {
		return fmt.Errorf("get site: %w", err)
	}

	// Decrypt access token if present.
	token := ""
	if site.AccessToken != "" {
		decrypted, err := crypto.Decrypt(m.encKey, site.AccessToken)
		if err != nil {
			slog.Warn("static site: failed to decrypt access token", "site", site.Name, "error", err)
		} else {
			token = decrypted
		}
	}

	provider, err := NewGitProvider(ProviderType(site.Provider), site.GiteaURL, token)
	if err != nil {
		m.updateStatus(site.ID, "failed", site.LastCommitSHA, fmt.Sprintf("create provider: %v", err))
		return fmt.Errorf("create provider: %w", err)
	}

	// Check if there's a new commit.
	latestSHA, err := provider.GetLatestCommitSHA(ctx, site.RepoOwner, site.RepoName, site.Branch)
	if err != nil {
		m.updateStatus(site.ID, "failed", site.LastCommitSHA, fmt.Sprintf("fetch commit SHA: %v", err))
		return fmt.Errorf("get latest commit: %w", err)
	}

	// Skip redeploy only if SHA matches, status is deployed, container is running,
	// proxy route exists, AND force is false. Manual deploys always force a full rebuild.
	if !force && latestSHA == site.LastCommitSHA && site.Status == "deployed" && site.ContainerID != "" {
		running, _ := m.docker.IsContainerRunning(ctx, site.ContainerID)
		if !running {
			slog.Info("static site: container not running, forcing redeploy", "site", site.Name)
		} else if site.Domain != "" {
			// Also verify the proxy route still exists (it may have been deleted externally).
			proxyOK, err := m.proxyProvider.RouteExists(ctx, site.Domain)
			if err != nil {
				slog.Warn("static site: proxy check failed, forcing redeploy", "site", site.Name, "error", err)
			} else if !proxyOK {
				slog.Info("static site: proxy route missing, forcing redeploy", "site", site.Name)
			} else {
				slog.Info("static site: no changes", "site", site.Name, "sha", latestSHA)
				return nil
			}
		} else {
			slog.Info("static site: no changes", "site", site.Name, "sha", latestSHA)
			return nil
		}
	}

	// Update status to syncing.
	m.updateStatus(site.ID, "syncing", site.LastCommitSHA, "")
	m.publishEvent(site.ID, site.Name, "syncing")

	// Create temp directory for the build context.
	buildDir, err := os.MkdirTemp("", "dw-site-"+site.Name+"-*")
	if err != nil {
		m.updateStatus(site.ID, "failed", site.LastCommitSHA, fmt.Sprintf("create temp dir: %v", err))
		return fmt.Errorf("create temp dir: %w", err)
	}
	defer os.RemoveAll(buildDir)

	// Download folder contents.
	if err := provider.DownloadFolder(ctx, site.RepoOwner, site.RepoName, site.Branch, site.FolderPath, buildDir); err != nil {
		m.updateStatus(site.ID, "failed", site.LastCommitSHA, fmt.Sprintf("download folder: %v", err))
		return fmt.Errorf("download folder: %w", err)
	}

	// Render markdown if enabled.
	if site.RenderMarkdown {
		if err := RenderMarkdownFiles(buildDir); err != nil {
			slog.Warn("static site: markdown rendering failed", "site", site.Name, "error", err)
		}
	}

	// Determine mode: check for api/ subdirectory.
	mode := site.Mode
	apiDir := filepath.Join(buildDir, "api")
	hasAPI := false
	if info, err := os.Stat(apiDir); err == nil && info.IsDir() {
		hasAPI = true
	}
	if mode == "deno" && !hasAPI {
		// Fallback to static if no api/ folder found.
		mode = "static"
		slog.Info("static site: no api/ folder found, falling back to static mode", "site", site.Name)
	}

	// Prepare build context based on mode.
	imageTag := fmt.Sprintf("dw-site-%s:latest", site.Name)
	contextDir, err := os.MkdirTemp("", "dw-site-build-*")
	if err != nil {
		m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("create build context: %v", err))
		return fmt.Errorf("create build context dir: %w", err)
	}
	defer os.RemoveAll(contextDir)

	if mode == "deno" {
		if err := m.prepareDenoBuild(buildDir, contextDir); err != nil {
			m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("prepare deno build: %v", err))
			return fmt.Errorf("prepare deno build: %w", err)
		}
	} else {
		if err := m.prepareStaticBuild(buildDir, contextDir); err != nil {
			m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("prepare static build: %v", err))
			return fmt.Errorf("prepare static build: %w", err)
		}
	}

	// Build Docker image.
	if err := m.docker.BuildImage(ctx, contextDir, imageTag); err != nil {
		m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("build image: %v", err))
		return fmt.Errorf("build image: %w", err)
	}

	// Prepare environment variables (secrets).
	env, err := m.buildEnvVars(site.ID)
	if err != nil {
		m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("build env vars: %v", err))
		return fmt.Errorf("build env vars: %w", err)
	}

	// Determine container port.
	containerPort := "80"
	if mode == "deno" {
		containerPort = "8000"
	}

	// Get network settings.
	settings, err := m.store.GetSettings()
	if err != nil {
		m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("get settings: %v", err))
		return fmt.Errorf("get settings: %w", err)
	}

	networkName := settings.Network
	networkID, err := m.docker.EnsureNetwork(ctx, networkName)
	if err != nil {
		m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("ensure network: %v", err))
		return fmt.Errorf("ensure network: %w", err)
	}

	containerName := fmt.Sprintf("dw-site-%s", site.Name)

	// Prepare volume mounts for persistent storage.
	var mounts []mount.Mount
	if site.StorageEnabled && mode == "deno" {
		volName, volErr := m.docker.EnsureSiteVolume(ctx, site.Name)
		if volErr != nil {
			slog.Warn("static site: failed to ensure storage volume", "site", site.Name, "error", volErr)
		} else {
			mounts = append(mounts, mount.Mount{
				Type:   mount.TypeVolume,
				Source: volName,
				Target: "/app/data",
			})
			slog.Info("static site: storage volume attached", "site", site.Name, "volume", volName)
		}
	}

	// Create and start new container.
	containerID, err := m.docker.CreateContainer(ctx, docker.ContainerConfig{
		Name:         containerName,
		Image:        imageTag,
		Env:          env,
		ExposedPorts: []string{containerPort + "/tcp"},
		NetworkName:  networkName,
		NetworkID:    networkID,
		Mounts:       mounts,
		Labels: map[string]string{
			"tinyforge.static-site":    site.ID,
			"tinyforge.static-site-name": site.Name,
		},
		Project: "static-site",
		Stage:   site.Name,
	})
	if err != nil {
		// Container might already exist — try to remove and recreate.
		if site.ContainerID != "" {
			m.docker.StopContainer(ctx, site.ContainerID, 10)
			m.docker.RemoveContainer(ctx, site.ContainerID, true)
		}
		// Also try by name.
		m.removeContainerByName(ctx, containerName)

		containerID, err = m.docker.CreateContainer(ctx, docker.ContainerConfig{
			Name:         containerName,
			Image:        imageTag,
			Env:          env,
			ExposedPorts: []string{containerPort + "/tcp"},
			NetworkName:  networkName,
			NetworkID:    networkID,
			Mounts:       mounts,
			Labels: map[string]string{
				"tinyforge.static-site":    site.ID,
				"tinyforge.static-site-name": site.Name,
			},
			Project: "static-site",
			Stage:   site.Name,
		})
		if err != nil {
			m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("create container: %v", err))
			return fmt.Errorf("create container: %w", err)
		}
	}

	if err := m.docker.StartContainer(ctx, containerID); err != nil {
		m.docker.RemoveContainer(ctx, containerID, true)
		m.updateStatus(site.ID, "failed", latestSHA, fmt.Sprintf("start container: %v", err))
		return fmt.Errorf("start container: %w", err)
	}

	// Brief health check: wait 3 seconds and verify container is still running.
	time.Sleep(3 * time.Second)
	running, err := m.docker.IsContainerRunning(ctx, containerID)
	if err != nil || !running {
		// Grab container logs for the error message.
		logMsg := "container exited immediately after start"
		if logs, logErr := m.docker.ContainerLogs(ctx, containerID, false, "20"); logErr == nil {
			buf, _ := io.ReadAll(logs)
			logs.Close()
			if len(buf) > 0 {
				logMsg = string(buf)
				// Truncate to reasonable length.
				if len(logMsg) > 500 {
					logMsg = logMsg[:500] + "..."
				}
			}
		}
		m.docker.RemoveContainer(ctx, containerID, true)
		m.updateStatus(site.ID, "failed", latestSHA, logMsg)
		return fmt.Errorf("container not running: %s", logMsg)
	}

	// Determine proxy target: container name + internal port (default),
	// or server IP + host port for NPM remote mode.
	internalPort, _ := strconv.Atoi(containerPort)
	forwardHost := containerName
	forwardPort := internalPort

	if settings.NpmRemote && settings.ProxyProvider == "npm" {
		if settings.ServerIP != "" {
			hostPort, err := m.docker.InspectContainerPort(ctx, containerID, containerPort+"/tcp")
			if err != nil {
				slog.Warn("static site: could not get host port for remote NPM", "site", site.Name, "error", err)
			} else {
				forwardHost = settings.ServerIP
				forwardPort = int(hostPort)
			}
		}
	}

	// Configure proxy if domain is set.
	proxyRouteID := site.ProxyRouteID
	if site.Domain != "" {
		// Remove old proxy route if exists.
		if site.ProxyRouteID != "" {
			m.proxyProvider.DeleteRoute(ctx, site.ProxyRouteID)
		}

		routeID, err := m.proxyProvider.ConfigureRoute(ctx, site.Domain, forwardHost, forwardPort, proxy.RouteOptions{
			SSLCertificateID: settings.SSLCertificateID,
		})
		if err != nil {
			slog.Warn("static site: failed to configure proxy", "site", site.Name, "domain", site.Domain, "target", fmt.Sprintf("%s:%d", forwardHost, forwardPort), "error", err)
		} else {
			proxyRouteID = routeID
			slog.Info("static site: proxy configured", "site", site.Name, "domain", site.Domain, "target", fmt.Sprintf("%s:%d", forwardHost, forwardPort), "routeID", routeID)
		}
	}

	// Remove old container if different.
	if site.ContainerID != "" && site.ContainerID != containerID {
		m.docker.StopContainer(ctx, site.ContainerID, 10)
		m.docker.RemoveContainer(ctx, site.ContainerID, true)
	}

	// Update site status.
	if err := m.store.UpdateStaticSiteContainer(site.ID, containerID, proxyRouteID); err != nil {
		slog.Error("static site: failed to update container info", "site", site.Name, "error", err)
	}
	m.updateStatus(site.ID, "deployed", latestSHA, "")
	m.publishEvent(site.ID, site.Name, "deployed")

	slog.Info("static site deployed", "site", site.Name, "sha", latestSHA[:8], "mode", mode)
	return nil
}

// Remove stops and removes a static site's container and proxy route.
func (m *Manager) Remove(ctx context.Context, siteID string) error {
	site, err := m.store.GetStaticSiteByID(siteID)
	if err != nil {
		return fmt.Errorf("get site: %w", err)
	}

	// Remove proxy route (best effort).
	if site.ProxyRouteID != "" {
		if err := m.proxyProvider.DeleteRoute(ctx, site.ProxyRouteID); err != nil {
			slog.Warn("static site: failed to remove proxy route", "site", site.Name, "error", err)
		}
	}

	// Stop and remove container (best effort).
	if site.ContainerID != "" {
		m.docker.StopContainer(ctx, site.ContainerID, 10)
		if err := m.docker.RemoveContainer(ctx, site.ContainerID, true); err != nil {
			slog.Warn("static site: failed to remove container", "site", site.Name, "error", err)
		}
	}

	// Remove storage volume if it was enabled (best effort).
	if site.StorageEnabled {
		if err := m.docker.RemoveSiteVolume(ctx, site.Name); err != nil {
			slog.Warn("static site: failed to remove storage volume", "site", site.Name, "error", err)
		}
	}

	return nil
}

// Stop stops a running static site container and removes its proxy route.
// The container is kept (not removed) so Start can bring it back without a full rebuild.
func (m *Manager) Stop(ctx context.Context, siteID string) error {
	site, err := m.store.GetStaticSiteByID(siteID)
	if err != nil {
		return fmt.Errorf("get site: %w", err)
	}

	// Remove proxy route first (best effort).
	if site.ProxyRouteID != "" {
		if err := m.proxyProvider.DeleteRoute(ctx, site.ProxyRouteID); err != nil {
			slog.Warn("static site: failed to remove proxy route", "site", site.Name, "error", err)
		}
	}

	// Stop container.
	if site.ContainerID != "" {
		if err := m.docker.StopContainer(ctx, site.ContainerID, 10); err != nil {
			slog.Warn("static site: failed to stop container", "site", site.Name, "error", err)
		}
	}

	// Clear proxy route ID; keep container ID.
	if err := m.store.UpdateStaticSiteContainer(site.ID, site.ContainerID, ""); err != nil {
		slog.Error("static site: failed to clear proxy route", "site", site.Name, "error", err)
	}
	m.updateStatus(site.ID, "stopped", site.LastCommitSHA, "")
	m.publishEvent(site.ID, site.Name, "stopped")

	slog.Info("static site stopped", "site", site.Name)
	return nil
}

// Start starts a previously stopped static site container and reconfigures the proxy.
// If the container no longer exists, it triggers a full redeploy.
func (m *Manager) Start(ctx context.Context, siteID string) error {
	site, err := m.store.GetStaticSiteByID(siteID)
	if err != nil {
		return fmt.Errorf("get site: %w", err)
	}

	// If no container exists, do a full deploy.
	if site.ContainerID == "" {
		return m.Deploy(ctx, siteID, true)
	}

	// Try to start the existing container.
	if err := m.docker.StartContainer(ctx, site.ContainerID); err != nil {
		slog.Warn("static site: failed to start container, falling back to redeploy", "site", site.Name, "error", err)
		return m.Deploy(ctx, siteID, true)
	}

	// Verify it's running after a brief wait.
	time.Sleep(2 * time.Second)
	running, _ := m.docker.IsContainerRunning(ctx, site.ContainerID)
	if !running {
		return m.Deploy(ctx, siteID, true)
	}

	// Reconfigure proxy if domain is set.
	settings, err := m.store.GetSettings()
	if err == nil && site.Domain != "" {
		containerPort := "80"
		if site.Mode == "deno" {
			containerPort = "8000"
		}
		internalPort, _ := strconv.Atoi(containerPort)
		containerName := fmt.Sprintf("dw-site-%s", site.Name)
		forwardHost := containerName
		forwardPort := internalPort

		if settings.NpmRemote && settings.ProxyProvider == "npm" && settings.ServerIP != "" {
			if hp, err := m.docker.InspectContainerPort(ctx, site.ContainerID, containerPort+"/tcp"); err == nil {
				forwardHost = settings.ServerIP
				forwardPort = int(hp)
			}
		}

		routeID, err := m.proxyProvider.ConfigureRoute(ctx, site.Domain, forwardHost, forwardPort, proxy.RouteOptions{
			SSLCertificateID: settings.SSLCertificateID,
		})
		if err != nil {
			slog.Warn("static site: failed to reconfigure proxy on start", "site", site.Name, "error", err)
		} else {
			m.store.UpdateStaticSiteContainer(site.ID, site.ContainerID, routeID)
		}
	}

	m.updateStatus(site.ID, "deployed", site.LastCommitSHA, "")
	m.publishEvent(site.ID, site.Name, "deployed")

	slog.Info("static site started", "site", site.Name)
	return nil
}

// TestConnection tests connectivity to a Git repository.
func (m *Manager) TestConnection(ctx context.Context, providerType, baseURL, accessToken, owner, repo string) error {
	provider, err := m.createProvider(providerType, baseURL, accessToken)
	if err != nil {
		return err
	}
	return provider.TestConnection(ctx, owner, repo)
}

// ListBranches returns branches for a Git repository.
func (m *Manager) ListBranches(ctx context.Context, providerType, baseURL, accessToken, owner, repo string) ([]string, error) {
	provider, err := m.createProvider(providerType, baseURL, accessToken)
	if err != nil {
		return nil, err
	}
	return provider.ListBranches(ctx, owner, repo)
}

// ListTree returns the repository tree for the folder picker.
func (m *Manager) ListTree(ctx context.Context, providerType, baseURL, accessToken, owner, repo, branch string) ([]FolderEntry, error) {
	provider, err := m.createProvider(providerType, baseURL, accessToken)
	if err != nil {
		return nil, err
	}
	return provider.ListTree(ctx, owner, repo, branch)
}

// ListRepos returns repositories from a Git server.
func (m *Manager) ListRepos(ctx context.Context, providerType, baseURL, accessToken, query string) ([]RepoInfo, error) {
	provider, err := m.createProvider(providerType, baseURL, accessToken)
	if err != nil {
		return nil, err
	}
	return provider.ListRepos(ctx, query)
}

// DetectProvider autodetects the Git provider from a URL, with API probing.
func (m *Manager) DetectProvider(ctx context.Context, baseURL string) string {
	return string(DetectProviderWithProbe(ctx, baseURL))
}

// createProvider builds a GitProvider from encrypted credentials.
func (m *Manager) createProvider(providerType, baseURL, accessToken string) (GitProvider, error) {
	token := ""
	if accessToken != "" {
		decrypted, err := crypto.Decrypt(m.encKey, accessToken)
		if err != nil {
			token = accessToken // might be plaintext
		} else {
			token = decrypted
		}
	}
	return NewGitProvider(ProviderType(providerType), baseURL, token)
}

// prepareDenoBuild sets up the build context for a Deno container.
func (m *Manager) prepareDenoBuild(srcDir, contextDir string) error {
	// Move api/ to context.
	apiSrc := filepath.Join(srcDir, "api")
	apiDst := filepath.Join(contextDir, "api")
	if err := os.Rename(apiSrc, apiDst); err != nil {
		return fmt.Errorf("move api dir: %w", err)
	}

	// Move remaining files to public/.
	publicDir := filepath.Join(contextDir, "public")
	if err := os.Rename(srcDir, publicDir); err != nil {
		// If rename fails (cross-device), use copy.
		if err := copyDir(srcDir, publicDir); err != nil {
			return fmt.Errorf("copy public dir: %w", err)
		}
	}

	// Scan routes and generate router.
	routes, err := deno.ScanRoutes(apiDst)
	if err != nil {
		return fmt.Errorf("scan routes: %w", err)
	}

	routerSrc, err := deno.GenerateRouter(routes)
	if err != nil {
		return fmt.Errorf("generate router: %w", err)
	}

	if err := os.WriteFile(filepath.Join(contextDir, "router.ts"), []byte(routerSrc), 0o644); err != nil {
		return fmt.Errorf("write router.ts: %w", err)
	}

	// Generate Dockerfile.
	dockerfile := deno.GenerateDockerfile()
	if err := os.WriteFile(filepath.Join(contextDir, "Dockerfile"), []byte(dockerfile), 0o644); err != nil {
		return fmt.Errorf("write Dockerfile: %w", err)
	}

	return nil
}

// prepareStaticBuild sets up the build context for a static nginx container.
func (m *Manager) prepareStaticBuild(srcDir, contextDir string) error {
	// Copy all files to context directory.
	if err := copyDir(srcDir, contextDir); err != nil {
		return fmt.Errorf("copy files: %w", err)
	}

	// Generate Dockerfile.
	dockerfile := deno.GenerateStaticDockerfile()
	if err := os.WriteFile(filepath.Join(contextDir, "Dockerfile"), []byte(dockerfile), 0o644); err != nil {
		return fmt.Errorf("write Dockerfile: %w", err)
	}

	return nil
}

// buildEnvVars decrypts secrets and builds environment variable list.
func (m *Manager) buildEnvVars(siteID string) ([]string, error) {
	secrets, err := m.store.GetStaticSiteSecretsBySiteID(siteID)
	if err != nil {
		return nil, fmt.Errorf("get secrets: %w", err)
	}

	env := make([]string, 0, len(secrets))
	for _, s := range secrets {
		value := s.Value
		if s.Encrypted {
			decrypted, err := crypto.Decrypt(m.encKey, value)
			if err != nil {
				return nil, fmt.Errorf("decrypt secret %s: %w", s.Key, err)
			}
			value = decrypted
		}
		env = append(env, s.Key+"="+value)
	}

	return env, nil
}

// removeContainerByName removes a container by its name (best effort).
func (m *Manager) removeContainerByName(ctx context.Context, name string) {
	containers, err := m.docker.ListContainers(ctx, nil)
	if err != nil {
		return
	}
	for _, c := range containers {
		if c.Name == name {
			m.docker.StopContainer(ctx, c.ID, 10)
			m.docker.RemoveContainer(ctx, c.ID, true)
			return
		}
	}
}

// updateStatus updates the site status in the database.
// On failure, it also publishes an event to the event log.
func (m *Manager) updateStatus(id, status, commitSHA, errMsg string) {
	if err := m.store.UpdateStaticSiteStatus(id, status, commitSHA, errMsg); err != nil {
		slog.Error("static site: failed to update status", "id", id, "status", status, "error", err)
	}

	// Persist failures to event log automatically.
	if status == "failed" {
		site, err := m.store.GetStaticSiteByID(id)
		siteName := id
		if err == nil {
			siteName = site.Name
		}
		m.publishEvent(id, siteName, "failed: "+errMsg)
	}
}

// publishEvent publishes a static site status event on the event bus
// and persists it to the event log for the dashboard.
func (m *Manager) publishEvent(siteID, siteName, status string) {
	m.eventBus.Publish(events.Event{
		Type: events.EventStaticSiteStatus,
		Payload: events.StaticSiteStatusPayload{
			SiteID: siteID,
			Name:   siteName,
			Status: status,
		},
	})

	// Persist to event log.
	severity := "info"
	message := fmt.Sprintf("Static site \"%s\": %s", siteName, status)
	if status == "failed" {
		severity = "error"
	}
	metadata := fmt.Sprintf(`{"site_id":"%s","site_name":"%s","status":"%s"}`, siteID, siteName, status)

	evt, err := m.store.InsertEvent(store.EventLog{
		Source:   "static_site",
		Severity: severity,
		Message:  message,
		Metadata: metadata,
	})
	if err != nil {
		slog.Error("static site: failed to persist event log", "error", err)
		return
	}

	// Publish the persisted event for SSE clients.
	m.eventBus.Publish(events.Event{
		Type: events.EventLog,
		Payload: events.EventLogPayload{
			ID:        evt.ID,
			Source:    "static_site",
			Severity:  severity,
			Message:   message,
			Metadata:  metadata,
			CreatedAt: evt.CreatedAt,
		},
	})
}

// copyDir recursively copies a directory.
func copyDir(src, dst string) error {
	return filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		relPath, err := filepath.Rel(src, path)
		if err != nil {
			return err
		}

		dstPath := filepath.Join(dst, relPath)

		if info.IsDir() {
			return os.MkdirAll(dstPath, 0o755)
		}

		data, err := os.ReadFile(path)
		if err != nil {
			return err
		}

		return os.WriteFile(dstPath, data, info.Mode())
	})
}

// hostPortStr converts a uint16 port to a string for proxy configuration.
func hostPortStr(port uint16) string {
	return strconv.FormatUint(uint64(port), 10)
}