// Package image implements the "image" source: a single container pulled
// from a registry. This is the canonical CI-driven shape — the registry
// trigger feeds it new tags, and Deploy reconciles the running container
// to match the requested tag.
package image

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"log/slog"
	"regexp"
	"sort"
	"strings"
	"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/proxy"
	"github.com/alexei/tinyforge/internal/store"
	"github.com/alexei/tinyforge/internal/volume"
	"github.com/alexei/tinyforge/internal/workload/plugin"
)

// Config is the per-workload source config blob. Mirrors the deployment
// fields that used to live on the projects + stages tables, less anything
// that is now a Workload-level concern (notification config, webhook
// secrets, public_face, group/parent).
type Config struct {
	Image        string            `json:"image"`         // fully-qualified, e.g. registry.example.com/owner/app
	RegistryName string            `json:"registry_name"` // FK by name into registries table; "" = public/no auth
	Port         int               `json:"port"`          // container's primary exposed port
	Healthcheck  string            `json:"healthcheck"`   // HTTP path, e.g. "/healthz"; "" disables
	Env          map[string]string `json:"env"`           // injected as container env
	Volumes      []VolumeMount     `json:"volumes"`
	CpuLimit     float64           `json:"cpu_limit"`     // CPU cores; 0 = unlimited
	MemoryLimit  int               `json:"memory_limit"`  // megabytes; 0 = unlimited
	DefaultTag   string            `json:"default_tag"`   // tag used when intent.Reference is empty
	MaxInstances int               `json:"max_instances"` // simultaneous containers to keep; 0/1 = strict blue-green
}

// VolumeMount mirrors the existing store.Volume scope shape but as a flat
// per-workload list. Future absolute / named-volume scopes can extend
// this without schema changes.
type VolumeMount struct {
	Source string `json:"source"`
	Target string `json:"target"`
	Scope  string `json:"scope"`
	Name   string `json:"name"`
}

type source struct{}

func init() { plugin.RegisterSource(&source{}) }

func (*source) Kind() string { return "image" }

// SchemaSample returns a populated example of Config so the frontend can
// render kind-aware forms without hardcoding samples per call-site. Each
// Source / Trigger exposes the same hook via plugin.SourceSchemaer /
// plugin.TriggerSchemaer below.
func (*source) SchemaSample() any {
	return Config{
		Image:        "registry.example.com/owner/app",
		Port:         8080,
		Healthcheck:  "/healthz",
		Env:          map[string]string{},
		Volumes:      []VolumeMount{},
		DefaultTag:   "latest",
		MaxInstances: 1,
	}
}

func (*source) Validate(cfg json.RawMessage) error {
	var c Config
	if len(cfg) == 0 {
		return fmt.Errorf("image source: config is required")
	}
	if err := json.Unmarshal(cfg, &c); err != nil {
		return fmt.Errorf("image source: invalid json: %w", err)
	}
	if strings.TrimSpace(c.Image) == "" {
		return fmt.Errorf("image source: image is required")
	}
	if c.Port < 0 || c.Port > 65535 {
		return fmt.Errorf("image source: port must be 0-65535")
	}
	for i, v := range c.Volumes {
		if strings.TrimSpace(v.Target) == "" {
			return fmt.Errorf("image source: volumes[%d].target is required", i)
		}
		if v.Scope == "" {
			return fmt.Errorf("image source: volumes[%d].scope is required", i)
		}
	}
	return nil
}

// Deploy executes a blue-green deploy of w against the image tag implied
// by intent. The flow:
//
//  1. Short-circuit if an existing container for this workload is already
//     running the requested ImageRef (duplicate webhook deliveries).
//  2. Pull image, ensure network.
//  3. Create + start a NEW container with a unique-per-deploy name (the
//     old container keeps serving traffic).
//  4. Optional in-network healthcheck. Failure rolls back the new
//     container only — the old container is untouched.
//  5. Register / update each public face's proxy route to point at the
//     new container.
//  6. Enforce cfg.MaxInstances (default 1) by removing the oldest
//     surplus containers belonging to this workload. With MaxInstances=1
//     this is the "green" cutover — old container is removed only AFTER
//     the new face is live.
//
// Any failure between create and face-registration rolls back the new
// container + its row; old serving state is preserved.
func (*source) Deploy(ctx context.Context, deps plugin.Deps, w plugin.Workload, intent plugin.DeploymentIntent) (err error) {
	cfg, err := plugin.SourceConfigOf[Config](w)
	if err != nil {
		return fmt.Errorf("image source: decode config: %w", err)
	}
	if strings.TrimSpace(cfg.Image) == "" {
		return fmt.Errorf("image source: workload %s has empty image", w.ID)
	}

	tag := intent.Reference
	if tag == "" {
		tag = cfg.DefaultTag
	}
	if tag == "" {
		tag = "latest"
	}
	imageRef := cfg.Image + ":" + tag

	settings, err := deps.Store.GetSettings()
	if err != nil {
		return fmt.Errorf("image source: load settings: %w", err)
	}
	if settings.Network == "" {
		return fmt.Errorf("image source: settings.network is required")
	}

	existing, err := deps.Store.ListContainersByWorkload(w.ID)
	if err != nil {
		return fmt.Errorf("image source: list existing containers: %w", err)
	}

	// Idempotency: if a container is already running the requested
	// ImageRef, short-circuit. Saves a pull + churn on duplicate webhook
	// deliveries (Gitea retries on flaky 5xx, etc.).
	for _, c := range existing {
		if c.ImageRef == imageRef && c.State == "running" && c.ContainerID != "" {
			if running, err := deps.Docker.IsContainerRunning(ctx, c.ContainerID); err == nil && running {
				slog.Info("image source: deploy skipped — already running",
					"workload", w.ID, "image", imageRef, "trigger", intent.Reason)
				return nil
			}
		}
	}

	// Past the idempotency short-circuit: this is a real deploy. Emit a
	// terminal audit event for the per-app timeline. Armed here (not at the
	// top) so duplicate-webhook no-ops above don't flood the log, and
	// pre-flight config/settings errors above stay quiet. err is the named
	// return, so the deferred closure observes the final outcome.
	defer func() {
		if err != nil {
			plugin.EmitDeployEvent(deps, w, "image", "failed: "+err.Error())
		} else {
			plugin.EmitDeployEvent(deps, w, "image", "deployed")
		}
	}()

	authConfig, err := buildRegistryAuth(deps, cfg.RegistryName)
	if err != nil {
		return fmt.Errorf("image source: %w", err)
	}
	if err := deps.Docker.PullImage(ctx, cfg.Image, tag, authConfig); err != nil {
		slog.Warn("image source: pull failed", "image", imageRef, "error", err)
		return fmt.Errorf("image source: pull %s failed", imageRef)
	}

	networkID, err := deps.Docker.EnsureNetwork(ctx, settings.Network)
	if err != nil {
		return fmt.Errorf("image source: ensure network: %w", err)
	}

	// Unique-per-deploy name so the new container can run alongside the
	// old one. The suffix is monotonic ms; collisions are not a real
	// concern for human-driven or webhook-driven deploys.
	containerName := buildContainerName(w.Name, w.ID, tag, time.Now())

	cc := docker.ContainerConfig{
		Name:         containerName,
		Image:        imageRef,
		Env:          buildEnv(deps, w, cfg),
		ExposedPorts: []string{fmt.Sprintf("%d/tcp", cfg.Port)},
		NetworkName:  settings.Network,
		NetworkID:    networkID,
		WorkloadID:   w.ID,
		WorkloadKind: "image",
		Role:         "image",
		Mounts:       computeMounts(deps, w, cfg, tag, settings),
		CpuLimit:     cfg.CpuLimit,
		MemoryLimit:  cfg.MemoryLimit,
	}

	// Per-face proxy labels (Traefik picks these up; NPM ignores them).
	primary := primaryFace(w.PublicFaces)
	for _, face := range w.PublicFaces {
		if !faceEnabled(face) {
			continue
		}
		port := face.TargetPort
		if port == 0 {
			port = cfg.Port
		}
		fqdn := fqdnFor(face, settings.Domain)
		if labels := deps.Proxy.ContainerLabels(fqdn, port); labels != nil {
			if cc.Labels == nil {
				cc.Labels = map[string]string{}
			}
			for k, v := range labels {
				cc.Labels[k] = v
			}
		}
	}

	dockerID, err := deps.Docker.CreateContainer(ctx, cc)
	if err != nil {
		return fmt.Errorf("image source: create container: %w", err)
	}

	row := store.Container{
		WorkloadID:   w.ID,
		WorkloadKind: "image",
		Role:         "image",
		ContainerID:  dockerID,
		ImageRef:     imageRef,
		ImageTag:     tag,
		Host:         "local",
		State:        "stopped",
		Port:         cfg.Port,
		Subdomain:    primary.Subdomain,
	}
	created, err := deps.Store.CreateContainer(row)
	if err != nil {
		_ = deps.Docker.RemoveContainer(ctx, dockerID, true)
		return fmt.Errorf("image source: persist container row: %w", err)
	}

	// Cleanup helper: roll back only the NEW container we just created.
	// Old containers are left running so a failed deploy is non-disruptive.
	rollbackNew := func(reason string, src error) error {
		_ = deps.Docker.RemoveContainer(ctx, dockerID, true)
		if delErr := deps.Store.DeleteContainer(created.ID); delErr != nil && !errors.Is(delErr, store.ErrNotFound) {
			slog.Warn("image source: rollback delete row",
				"workload", w.ID, "row", created.ID, "stage", reason, "error", delErr)
		}
		return fmt.Errorf("image source: %s: %w", reason, src)
	}

	if err := deps.Docker.StartContainer(ctx, dockerID); err != nil {
		return rollbackNew("start container", err)
	}
	if err := deps.Store.UpdateContainerState(created.ID, "running"); err != nil {
		slog.Warn("image source: update container state", "workload", w.ID, "error", err)
	}

	// Optional in-network healthcheck. Failure rolls back the new
	// container; the old one keeps serving via its existing proxy face.
	if cfg.Healthcheck != "" && deps.Health != nil {
		healthURL := fmt.Sprintf("http://%s:%d%s", containerName, cfg.Port, cfg.Healthcheck)
		if err := deps.Health.Check(ctx, healthURL); err != nil {
			return rollbackNew(fmt.Sprintf("health check %s", healthURL), err)
		}
	}

	// Switch each public face to the new container. ConfigureRoute is
	// upsert-style at the proxy provider, so the old route is replaced
	// in-place by FQDN — no traffic gap. Per-face route IDs are
	// collected and stored on the container row's extra_json so Teardown
	// can drop every route (not just the primary).
	faceRoutes := map[string]string{} // fqdn → routeID
	for i, face := range w.PublicFaces {
		if !faceEnabled(face) {
			continue
		}
		port := face.TargetPort
		if port == 0 {
			port = cfg.Port
		}
		fqdn := fqdnFor(face, settings.Domain)

		forwardHost := containerName
		forwardPort := port
		if settings.NpmRemote && settings.ProxyProvider == "npm" {
			if settings.ServerIP == "" {
				return rollbackNew("configure proxy", fmt.Errorf("NPM remote mode requires settings.server_ip"))
			}
			forwardHost = settings.ServerIP
			hostPort, err := deps.Docker.InspectContainerPort(ctx, dockerID, fmt.Sprintf("%d/tcp", port))
			if err != nil {
				return rollbackNew("inspect host port", err)
			}
			forwardPort = int(hostPort)
		}

		accessListID := settings.NpmAccessListID
		if face.AccessListID > 0 {
			accessListID = face.AccessListID
		}

		routeID, err := deps.Proxy.ConfigureRoute(ctx, fqdn, forwardHost, forwardPort, proxy.RouteOptions{
			SSLCertificateID: settings.SSLCertificateID,
			AccessListID:     accessListID,
		})
		if err != nil {
			// Roll back any face routes we've already configured this
			// deploy so a partial failure doesn't leak orphan rules at
			// the proxy provider.
			for prevFQDN, prevRouteID := range faceRoutes {
				_ = prevFQDN
				if dErr := deps.Proxy.DeleteRoute(ctx, prevRouteID); dErr != nil {
					slog.Warn("image source: rollback proxy route",
						"workload", w.ID, "route", prevRouteID, "error", dErr)
				}
			}
			return rollbackNew(fmt.Sprintf("configure proxy face[%d]", i), err)
		}
		faceRoutes[fqdn] = routeID

		if i == 0 {
			created.ProxyRouteID = routeID
			created.Subdomain = face.Subdomain
		}

		// Best-effort DNS. Skipped under wildcard DNS (deps.DNS == nil).
		if deps.DNS != nil && settings.PublicIP != "" {
			if _, err := deps.DNS.EnsureRecord(ctx, fqdn, settings.PublicIP); err != nil {
				slog.Warn("image source: ensure DNS", "fqdn", fqdn, "error", err)
			}
		}
	}

	// Persist the per-face route map on the container row so Teardown
	// and the next blue-green redeploy can find every configured face.
	if len(faceRoutes) > 0 {
		extra := containerExtra{ProxyRoutes: faceRoutes}
		if b, err := json.Marshal(extra); err == nil {
			created.ExtraJSON = string(b)
		}
	}
	if err := deps.Store.UpdateContainer(created); err != nil {
		slog.Warn("image source: update container with routes", "workload", w.ID, "error", err)
	}

	// Now the new container is live behind the proxy. Enforce
	// MaxInstances by removing oldest surplus rows (which includes the
	// pre-deploy "blue" container when MaxInstances=1).
	maxInstances := cfg.MaxInstances
	if maxInstances <= 0 {
		maxInstances = 1
	}
	enforceMaxInstances(ctx, deps, w, created.ID, maxInstances)

	return nil
}

// enforceMaxInstances trims older containers down to `keep` total for this
// workload, preserving the just-deployed row (justDeployedRowID) at the
// top. Best-effort: failures are logged, not propagated — the new deploy
// already succeeded and we don't want to roll it back because cleanup of
// an old container hiccupped.
func enforceMaxInstances(ctx context.Context, deps plugin.Deps, w plugin.Workload, justDeployedRowID string, keep int) {
	rows, err := deps.Store.ListContainersByWorkload(w.ID)
	if err != nil {
		slog.Warn("image source: list for max-instances", "workload", w.ID, "error", err)
		return
	}
	// Sort newest first by CreatedAt, with the just-deployed row pinned
	// at index 0 regardless of clock skew.
	sort.Slice(rows, func(i, j int) bool {
		if rows[i].ID == justDeployedRowID {
			return true
		}
		if rows[j].ID == justDeployedRowID {
			return false
		}
		return rows[i].CreatedAt > rows[j].CreatedAt
	})
	if len(rows) <= keep {
		return
	}
	for _, victim := range rows[keep:] {
		if victim.ID == justDeployedRowID {
			continue
		}
		if victim.ContainerID != "" {
			if err := deps.Docker.RemoveContainer(ctx, victim.ContainerID, true); err != nil {
				slog.Warn("image source: remove old container",
					"workload", w.ID, "container", victim.ContainerID, "error", err)
			}
		}
		// The proxy route was already replaced by ConfigureRoute earlier
		// (same FQDN, new target). The old route ID, if any, is still
		// valid in the proxy provider's DB but now points at a removed
		// container. Delete it to keep the proxy clean. Best-effort.
		if victim.ProxyRouteID != "" && victim.ProxyRouteID != findCurrentRouteID(rows, justDeployedRowID) {
			if err := deps.Proxy.DeleteRoute(ctx, victim.ProxyRouteID); err != nil {
				slog.Warn("image source: delete old proxy route",
					"workload", w.ID, "route", victim.ProxyRouteID, "error", err)
			}
		}
		if err := deps.Store.DeleteContainer(victim.ID); err != nil && !errors.Is(err, store.ErrNotFound) {
			slog.Warn("image source: delete old container row",
				"workload", w.ID, "row", victim.ID, "error", err)
		}
	}
}

// findCurrentRouteID returns the route ID stored on the just-deployed
// row, so we don't accidentally delete the live face.
func findCurrentRouteID(rows []store.Container, justDeployedRowID string) string {
	for _, r := range rows {
		if r.ID == justDeployedRowID {
			return r.ProxyRouteID
		}
	}
	return ""
}

// Teardown stops and removes every container, proxy route, and DNS
// record owned by this workload. Idempotent. Reads extra_json off each
// row so non-primary face routes are cleaned up too — without this a
// multi-face workload would leak every face beyond the primary at
// delete-time.
func (*source) Teardown(ctx context.Context, deps plugin.Deps, w plugin.Workload) error {
	rows, err := deps.Store.ListContainersByWorkload(w.ID)
	if err != nil {
		return fmt.Errorf("image source: list containers: %w", err)
	}
	settings, _ := deps.Store.GetSettings()

	for _, c := range rows {
		if c.ContainerID != "" {
			if err := deps.Docker.RemoveContainer(ctx, c.ContainerID, true); err != nil {
				slog.Warn("image source: remove docker container", "workload", w.ID, "container", c.ContainerID, "error", err)
			}
		}
		// Collect every route to delete: the primary (c.ProxyRouteID)
		// plus any extras stashed under extra_json.proxy_routes. Dedup
		// because the primary is also re-listed in the extras map.
		toDelete := map[string]string{} // fqdn → routeID
		if c.ProxyRouteID != "" {
			toDelete[c.Subdomain] = c.ProxyRouteID // key is opaque; we only iterate values
		}
		if c.ExtraJSON != "" && c.ExtraJSON != "{}" {
			var ex containerExtra
			if jErr := json.Unmarshal([]byte(c.ExtraJSON), &ex); jErr == nil {
				for fqdn, rid := range ex.ProxyRoutes {
					toDelete[fqdn] = rid
				}
			}
		}
		seenRoute := map[string]struct{}{}
		for _, rid := range toDelete {
			if _, dup := seenRoute[rid]; dup {
				continue
			}
			seenRoute[rid] = struct{}{}
			if err := deps.Proxy.DeleteRoute(ctx, rid); err != nil {
				slog.Warn("image source: delete proxy route",
					"workload", w.ID, "route", rid, "error", err)
			}
		}
		if deps.DNS != nil && c.Subdomain != "" && settings.Domain != "" {
			fqdn := c.Subdomain + "." + settings.Domain
			if err := deps.DNS.DeleteRecord(ctx, fqdn); err != nil {
				slog.Warn("image source: delete DNS", "fqdn", fqdn, "error", err)
			}
		}
		if err := deps.Store.DeleteContainer(c.ID); err != nil && !errors.Is(err, store.ErrNotFound) {
			slog.Warn("image source: delete container row", "id", c.ID, "error", err)
		}
	}
	return nil
}

// containerExtra is the shape stored under container.extra_json by the
// image source. Kept versionless on purpose — additive only, unknown
// keys must be ignored by older deployers reading rows written by newer
// ones.
type containerExtra struct {
	ProxyRoutes map[string]string `json:"proxy_routes,omitempty"`
}

// Reconcile is intentionally a no-op for the image source.
//
// State sync is fully handled by the generic reconciler pass that runs
// EARLIER in the same Reconciler.ReconcileOnce: its upsert loop writes each
// present container's State from the single `docker ps -a` snapshot
// (ListAllForReconciler), and its markMissing pass flips rows whose container
// ID is absent from that snapshot to 'missing'. Every image container carries
// the tinyforge.workload.id label (ContainerConfig.WorkloadID at create time),
// so the generic pass covers all of them.
//
// The previous implementation looped this workload's container rows and called
// Docker.IsContainerRunning per row — a redundant Docker inspect per container
// per tick that duplicated work already done from the snapshot and scaled as N
// Docker API calls/tick. Returning nil here drops that cost without changing
// observable state. The method stays because the source interface requires it.
func (*source) Reconcile(context.Context, plugin.Deps, plugin.Workload) error {
	return nil
}

// buildRegistryAuth returns a Docker registry auth string for the named
// registry, or "" when no auth is configured. Username is taken from
// reg.Owner when present; falls back to the token for registries that
// accept token-as-username (Docker Hub PATs, GHCR, etc.).
func buildRegistryAuth(deps plugin.Deps, registryName string) (string, error) {
	if registryName == "" {
		return "", nil
	}
	reg, err := deps.Store.GetRegistryByName(registryName)
	if err != nil {
		return "", fmt.Errorf("get registry %s: %w", registryName, err)
	}
	if reg.Token == "" {
		return "", nil
	}
	token, err := crypto.Decrypt(deps.EncKey, reg.Token)
	if err != nil {
		return "", fmt.Errorf("decrypt registry token: %w", err)
	}
	username := reg.Owner
	if username == "" {
		username = token
	}
	return docker.EncodeRegistryAuth(username, token, reg.URL)
}

// buildEnv flattens cfg.Env plus the workload_env overrides into the
// KEY=VALUE list Docker expects. workload_env wins on key conflict and
// encrypted rows are decrypted lazily so plaintext never lives in the
// store output. If a decrypt fails the value is skipped with a warning —
// failing the whole deploy because one rotated key bricked one env entry
// would be a worse outcome than the missing variable.
func buildEnv(deps plugin.Deps, w plugin.Workload, cfg Config) []string {
	merged := make(map[string]string, len(cfg.Env))
	for k, v := range cfg.Env {
		merged[k] = v
	}
	overrides, err := deps.Store.ListWorkloadEnv(w.ID)
	if err != nil {
		slog.Warn("image source: list workload env", "workload", w.ID, "error", err)
	} else {
		for _, e := range overrides {
			value := e.Value
			if e.Encrypted {
				decrypted, err := crypto.Decrypt(deps.EncKey, e.Value)
				if err != nil {
					slog.Warn("image source: decrypt env value",
						"workload", w.ID, "key", e.Key, "error", err)
					continue
				}
				value = decrypted
			}
			merged[e.Key] = value
		}
	}
	out := make([]string, 0, len(merged))
	for k, v := range merged {
		out = append(out, k+"="+v)
	}
	return out
}

// computeMounts resolves a workload's VolumeMounts into mount.Mount
// values. Both inline `cfg.Volumes` and persisted `workload_volumes` are
// considered — persisted rows win on target conflict so the operator's
// last UI-side edit takes precedence over whatever shipped with the
// config blob.
//
// All VolumeScope values are honored:
//
//   - absolute   → host bind (validated against settings.AllowedVolumePaths)
//   - ephemeral  → tmpfs (no host path)
//   - instance   → per-tag dir under <workload>/instance-<tag>/<source>
//   - stage      → shared per-workload dir (alias of project)
//   - project    → shared per-workload dir
//   - project_named → workload-scoped Docker named volume
//   - named         → globally-scoped Docker named volume
//
// Volumes with empty target or unresolvable scope are skipped with a
// warning rather than failing the whole deploy — a misconfigured volume
// should not brick an otherwise-valid CI push.
func computeMounts(deps plugin.Deps, w plugin.Workload, cfg Config, imageTag string, settings store.Settings) []mount.Mount {
	byTarget := map[string]VolumeMount{}
	for _, v := range cfg.Volumes {
		if v.Target == "" {
			continue
		}
		byTarget[v.Target] = v
	}
	if persisted, err := deps.Store.ListWorkloadVolumes(w.ID); err == nil {
		for _, p := range persisted {
			byTarget[p.Target] = VolumeMount{
				Source: p.Source,
				Target: p.Target,
				Scope:  p.Scope,
				Name:   p.Name,
			}
		}
	} else {
		slog.Warn("image source: list workload volumes", "workload", w.ID, "error", err)
	}

	params := volume.ResolveWorkloadParams{
		BasePath:           settings.BaseVolumePath,
		WorkloadID:         w.ID,
		WorkloadName:       w.Name,
		ImageTag:           imageTag,
		AllowedVolumePaths: settings.AllowedVolumePaths,
	}

	out := make([]mount.Mount, 0, len(byTarget))
	for _, v := range byTarget {
		if v.Target == "" {
			continue
		}

		switch v.Scope {
		case string(store.VolumeScopeEphemeral):
			out = append(out, mount.Mount{Type: mount.TypeTmpfs, Target: v.Target})
			continue
		case string(store.VolumeScopeNamed), string(store.VolumeScopeProjectNamed):
			// Docker named volumes use the volume name as Source. We
			// scope project_named entries to the workload by prefixing
			// the name so two workloads can both claim "data" without
			// sharing storage.
			name := v.Name
			if name == "" {
				slog.Warn("image source: named volume missing name",
					"workload", w.ID, "target", v.Target)
				continue
			}
			if v.Scope == string(store.VolumeScopeProjectNamed) {
				name = workloadNamedVolume(w, name)
			}
			out = append(out, mount.Mount{Type: mount.TypeVolume, Source: name, Target: v.Target})
			continue
		}

		// Everything else resolves to a host path (absolute, instance,
		// stage, project). Empty source on absolute is invalid; for the
		// others "source" is the per-scope subdirectory.
		wv := store.WorkloadVolume{
			Source: v.Source,
			Target: v.Target,
			Scope:  v.Scope,
			Name:   v.Name,
		}
		path, err := volume.ResolveWorkloadPath(wv, params)
		if err != nil {
			slog.Warn("image source: resolve volume",
				"workload", w.ID, "target", v.Target, "scope", v.Scope, "error", err)
			continue
		}
		out = append(out, mount.Mount{Type: mount.TypeBind, Source: path, Target: v.Target})
	}
	return out
}

// workloadNamedVolume builds the Docker volume name for a project_named
// mount. The "tf-" prefix and short-id suffix keep volumes from one
// workload separate from another's, even when they share a logical
// volume name.
func workloadNamedVolume(w plugin.Workload, name string) string {
	idShort := w.ID
	if len(idShort) > 8 {
		idShort = idShort[:8]
	}
	clean := strings.Trim(nameSanitizer.ReplaceAllString(name, "-"), "-")
	return "tf-" + idShort + "-" + clean
}

// buildContainerName generates a deterministic container name keyed on
// workload + tag. The scheme intentionally diverges from the legacy
// "dw-{project}-{stage}-{tag}" scheme so plugin-managed containers are
// trivially distinguishable in `docker ps`.
var nameSanitizer = regexp.MustCompile(`[^a-zA-Z0-9_.-]`)

func buildContainerName(workloadName, workloadID, tag string, ts time.Time) string {
	clean := func(s string) string {
		return strings.Trim(nameSanitizer.ReplaceAllString(s, "-"), "-")
	}
	idShort := workloadID
	if len(idShort) > 8 {
		idShort = idShort[:8]
	}
	// Suffix is a millisecond-resolution monotonic stamp so two deploys
	// can never collide on container name (blue-green needs the new
	// container to start while the old one is still bound to the same
	// "tf-name-id-tag" prefix).
	suffix := fmt.Sprintf("%x", ts.UnixMilli())
	return fmt.Sprintf("tf-%s-%s-%s-%s", clean(workloadName), idShort, clean(tag), suffix)
}

// faceEnabled is true for any face that should yield a proxy route. A
// face with empty subdomain AND empty domain is treated as disabled.
func faceEnabled(f plugin.PublicFace) bool {
	return f.Subdomain != "" || f.Domain != ""
}

func fqdnFor(f plugin.PublicFace, defaultDomain string) string {
	domain := f.Domain
	if domain == "" {
		domain = defaultDomain
	}
	if f.Subdomain == "" {
		return domain
	}
	return f.Subdomain + "." + domain
}

func primaryFace(faces []plugin.PublicFace) plugin.PublicFace {
	for _, f := range faces {
		if faceEnabled(f) {
			return f
		}
	}
	return plugin.PublicFace{}
}