// Package mediawire makes every PRESENT drive ready inside the media apps (v0.313.0, R-1024, R-1037; felhom.eu
// `architecture/15-media-library.md` §6 and §10 „added"). It is the Go port of the measured calls in
// `audits/media-all-drives-2026-10-14/tools/wire.py` and `audits/media-drive-events-2026-10-14/tools/wire.py`.
//
// Per drive d (M = <d>/userdata/media, the SAME path in every container):
//
//	folders      : M/torrents/{tv,movies}, M/transmission/{tv,movies}
//	qBittorrent  : automatic torrent management ON; categories tv-<tag>, movies-<tag> (save path M/torrents/<kind>,
//	               incomplete path M/torrents/.temp) — written only when they differ (K2: run 2 re-sent equal edits)
//	Transmission : incomplete folder OFF (belt; the template's entrypoint writes it into settings.json at start)
//	Sonarr/Radarr: tag <tag>; root folder M/tv | M/movies; „qBittorrent <tag>" (category) and „Transmission <tag>"
//	               (directory, category CLEARED); minimum free space when importing
//	Prowlarr     : one application each for Sonarr and Radarr, „Full Sync" (once)
//	Plex         : the drive's folders added to the EXISTING TV/film libraries, a scan, „scan when a change is
//	               detected" ON — with the server's own PlexOnlineToken read from Preferences.xml AT USE (`09` §3
//	               decision 248); never stored, never logged, sent only to the plex container (by address, R-1060)
//	Jellyfin     : the drive's folders added, a scan — with the API key named „felhom" read from Jellyfin's own
//	               database AT USE. No such key → one household step, said on the app's page.
//
// IDEMPOTENT: every write is preceded by a read and skipped when the state is already right; a second run writes
// nothing (TestRun_SecondRunWritesNothing). Links are NEVER undone when an app stops (unlike the OnlyOffice links of
// integrations/lifecycle.go): a stopped download client keeps its entries.
//
// SECRETS: every key and password is read at use and passed only in request headers/bodies to the app's own
// container. Nothing is written to disk except a transient copy of Jellyfin's database in a 0700 temp dir, removed at
// once. Log lines name keys, never values.
package mediawire

import (
	"bytes"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"path/filepath"
	"regexp"
	"sort"
	"strings"
	"sync"
	"time"
)

// MinFreeMB is Sonarr/Radarr's „minimum free space when importing".
const MinFreeMB = 10240

// Box is everything the wiring touches outside HTTP — a seam: tests fake it, production is DockerBox.
type Box interface {
	Running(container string) bool
	Env(container, name string) (string, error)      // `docker exec <c> printenv <name>`
	ReadFile(container, path string) ([]byte, error) // `docker exec <c> cat <path>`
	JellyfinKey(name string) (string, error)         // the API key with this name from Jellyfin's own DB
	EnsureDir(path string) error                     // the userdata convention (2775, gid 1000)
	Mounts(container string) map[string]string       // container target → host source
}

// Drive is one present drive.
type Drive struct {
	Path string // the drive's namespace root, e.g. /mnt/felhom-drives/media_b
}

// Tag is the Sonarr/Radarr tag and qBittorrent category suffix for the drive: its folder name, lowercased, every
// character outside [a-z0-9] turned into '-' (Sonarr refuses others).
func (d Drive) Tag() string {
	t := strings.ToLower(filepath.Base(d.Path))
	t = regexp.MustCompile(`[^a-z0-9]+`).ReplaceAllString(t, "-")
	return strings.Trim(t, "-")
}

// Media is the drive's shared library root.
func (d Drive) Media() string { return filepath.Join(d.Path, "userdata", "media") }

// Result is one app's outcome of a run.
type Result struct {
	App    string   `json:"app"`
	State  string   `json:"state"` // done | unchanged | skipped | household | error
	Wrote  []string `json:"wrote,omitempty"`
	Detail string   `json:"detail,omitempty"`
}

// Wirer runs the wiring. URL maps a container name to its base URL (tests point it at httptest servers).
type Wirer struct {
	Box    Box
	Logger *log.Logger
	HTTP   *http.Client
	URL    func(container string, port int) string
	mu     sync.Mutex
}

// New is the production Wirer: apps by container name on the docker network — Plex by its ADDRESS (R-1060, plexaddr.go).
func New(box Box, logger *log.Logger) *Wirer {
	return &Wirer{Box: box, Logger: logger, HTTP: &http.Client{Timeout: 60 * time.Second}, URL: productionURL(logger)}
}

// productionURL maps a container to its base URL: by name, except Plex by address. A Plex that cannot be resolved falls
// back to the name (its calls then fail as before) with a WARN, never silently.
func productionURL(logger *log.Logger) func(string, int) string {
	return func(c string, port int) string {
		if c == "plex" {
			u, err := PlexURL(port)
			if err == nil {
				return u
			}
			if logger != nil {
				logger.Printf("[WARN] [mediawire] plex: %v — calling it by name, which Plex refuses as non-local (R-1060)", err)
			}
		}
		return fmt.Sprintf("http://%s:%d", c, port)
	}
}

// Run wires every present drive into every installed media app. Single-flight: a second caller waits.
func (w *Wirer) Run(drives []Drive) []Result {
	w.mu.Lock()
	defer w.mu.Unlock()
	start := time.Now()
	sort.Slice(drives, func(i, j int) bool { return drives[i].Path < drives[j].Path })
	var out []Result
	out = append(out, w.folders(drives))
	qbPW, trPW := "", ""
	if w.Box.Running("qbittorrent") {
		qbPW, _ = w.Box.Env("qbittorrent", "QBT_ADMIN_PASSWORD")
		out = append(out, w.qbittorrent(drives, qbPW))
	}
	if w.Box.Running("transmission") {
		trPW, _ = w.Box.Env("transmission", "PASS")
		out = append(out, w.transmission(trPW))
	}
	for _, a := range []struct {
		app      string
		port     int
		kind     string
		rootKind string
	}{{"sonarr", 8989, "tv", "tv"}, {"radarr", 7878, "movie", "movies"}} {
		if w.Box.Running(a.app) {
			out = append(out, w.arr(a.app, a.port, a.kind, a.rootKind, drives, qbPW, trPW))
		}
	}
	if w.Box.Running("prowlarr") {
		out = append(out, w.prowlarr())
	}
	if w.Box.Running("plex") {
		out = append(out, w.plex(drives))
	}
	if w.Box.Running("jellyfin") {
		out = append(out, w.jellyfin(drives))
	}
	var parts []string
	for _, r := range out {
		parts = append(parts, fmt.Sprintf("%s=%s(%d)", r.App, r.State, len(r.Wrote)))
	}
	w.Logger.Printf("[INFO] [mediawire] %d drive(s) wired in %s: %s", len(drives), time.Since(start).Round(time.Millisecond), strings.Join(parts, " "))
	return out
}

func (w *Wirer) folders(drives []Drive) Result {
	r := Result{App: "folders"}
	for _, d := range drives {
		for _, sub := range []string{"torrents/tv", "torrents/movies", "transmission/tv", "transmission/movies"} {
			if err := w.Box.EnsureDir(filepath.Join(d.Media(), filepath.FromSlash(sub))); err != nil {
				r.State, r.Detail = "error", err.Error()
				return r
			}
		}
	}
	r.State = "done"
	return r
}

// ── HTTP helpers ─────────────────────────────────────────────────────────────────────────────────────────────────

func (w *Wirer) do(method, u string, hdr map[string]string, body io.Reader, ctype string) (int, []byte, http.Header, error) {
	req, err := http.NewRequest(method, u, body)
	if err != nil {
		return 0, nil, nil, err
	}
	for k, v := range hdr {
		if strings.EqualFold(k, "Host") {
			req.Host = v
			continue
		}
		req.Header.Set(k, v)
	}
	if ctype != "" {
		req.Header.Set("Content-Type", ctype)
	}
	resp, err := w.HTTP.Do(req)
	if err != nil {
		return 0, nil, nil, err
	}
	defer resp.Body.Close()
	b, _ := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
	return resp.StatusCode, b, resp.Header, nil
}

func (w *Wirer) jsonCall(method, u string, hdr map[string]string, in, out interface{}) (int, error) {
	var body io.Reader
	ct := ""
	if in != nil {
		b, _ := json.Marshal(in)
		body, ct = bytes.NewReader(b), "application/json"
	}
	code, b, _, err := w.do(method, u, hdr, body, ct)
	if err != nil {
		return code, err
	}
	if out != nil && len(b) > 0 {
		if err := json.Unmarshal(b, out); err != nil && code < 300 {
			return code, fmt.Errorf("%s %s: answer not JSON", method, redactURL(u))
		}
	}
	if code >= 300 {
		return code, fmt.Errorf("%s %s: HTTP %d", method, redactURL(u), code)
	}
	return code, nil
}

func redactURL(u string) string {
	if i := strings.Index(u, "?"); i >= 0 {
		return u[:i] + "?…"
	}
	return u
}

// ── qBittorrent ─────────────────────────────────────────────────────────────────────────────────────────────────

func (w *Wirer) qbittorrent(drives []Drive, pw string) Result {
	r := Result{App: "qbittorrent"}
	base := w.URL("qbittorrent", 8080)
	form := url.Values{"username": {"admin"}, "password": {pw}}
	code, _, hd, err := w.do("POST", base+"/api/v2/auth/login", map[string]string{"Referer": base}, strings.NewReader(form.Encode()), "application/x-www-form-urlencoded")
	m := regexp.MustCompile(`((?:QBT_)?SID[A-Za-z0-9_]*)=([^;]+)`).FindStringSubmatch(strings.Join(hd.Values("Set-Cookie"), "; "))
	if err != nil || (code != 200 && code != 204) || m == nil { // qBittorrent 5 answers a good login 204 (measured on Tester 1)
		r.State, r.Detail = "error", fmt.Sprintf("login: HTTP %d %v", code, err)
		return r
	}
	H := map[string]string{"Referer": base, "Cookie": m[1] + "=" + m[2]}
	var prefs map[string]interface{}
	if _, err := w.jsonCall("GET", base+"/api/v2/app/preferences", H, nil, &prefs); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	if prefs["auto_tmm_enabled"] != true {
		f := url.Values{"json": {`{"auto_tmm_enabled":true}`}}
		if c, _, _, err := w.do("POST", base+"/api/v2/app/setPreferences", H, strings.NewReader(f.Encode()), "application/x-www-form-urlencoded"); err != nil || c != 200 {
			r.State, r.Detail = "error", fmt.Sprintf("setPreferences: HTTP %d %v", c, err)
			return r
		}
		r.Wrote = append(r.Wrote, "auto_tmm_enabled=true")
	}
	var cats map[string]map[string]interface{}
	if _, err := w.jsonCall("GET", base+"/api/v2/torrents/categories", H, nil, &cats); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	for _, d := range drives {
		for _, kind := range []string{"tv", "movies"} {
			name := kind + "-" + d.Tag()
			save := filepath.Join(d.Media(), "torrents", kind)
			dl := filepath.Join(d.Media(), "torrents", ".temp")
			if c, ok := cats[name]; ok && fmt.Sprint(c["savePath"]) == save && (fmt.Sprint(c["download_path"]) == dl || fmt.Sprint(c["downloadPath"]) == dl) {
				continue
			}
			ep := "createCategory"
			if _, ok := cats[name]; ok {
				ep = "editCategory"
			}
			f := url.Values{"category": {name}, "savePath": {save}, "downloadPathEnabled": {"true"}, "downloadPath": {dl}}
			if c, _, _, err := w.do("POST", base+"/api/v2/torrents/"+ep, H, strings.NewReader(f.Encode()), "application/x-www-form-urlencoded"); err != nil || c != 200 {
				r.State, r.Detail = "error", fmt.Sprintf("%s %s: HTTP %d %v", ep, name, c, err)
				return r
			}
			r.Wrote = append(r.Wrote, ep+" "+name)
		}
	}
	r.State = stateOf(r)
	return r
}

func stateOf(r Result) string {
	if len(r.Wrote) == 0 {
		return "unchanged"
	}
	return "done"
}

// ── Transmission ────────────────────────────────────────────────────────────────────────────────────────────────

func (w *Wirer) transmission(pw string) Result {
	r := Result{App: "transmission"}
	u := w.URL("transmission", 9091) + "/transmission/rpc"
	H := map[string]string{"Authorization": "Basic " + base64.StdEncoding.EncodeToString([]byte("admin:"+pw)), "Host": "transmission:9091"}
	rpc := func(method string, args map[string]interface{}, out interface{}) error {
		body, _ := json.Marshal(map[string]interface{}{"method": method, "arguments": args})
		for i := 0; i < 2; i++ {
			c, b, hd, err := w.do("POST", u, H, bytes.NewReader(body), "application/json")
			if err != nil {
				return err
			}
			if c == 409 {
				H["X-Transmission-Session-Id"] = hd.Get("X-Transmission-Session-Id")
				continue
			}
			if c != 200 {
				return fmt.Errorf("%s: HTTP %d", method, c)
			}
			if out != nil {
				return json.Unmarshal(b, out)
			}
			return nil
		}
		return fmt.Errorf("%s: no session id", method)
	}
	var got struct {
		Arguments map[string]interface{} `json:"arguments"`
	}
	if err := rpc("session-get", map[string]interface{}{"fields": []string{"incomplete-dir-enabled"}}, &got); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	if got.Arguments["incomplete-dir-enabled"] == true {
		if err := rpc("session-set", map[string]interface{}{"incomplete-dir-enabled": false}, nil); err != nil {
			r.State, r.Detail = "error", err.Error()
			return r
		}
		r.Wrote = append(r.Wrote, "incomplete-dir-enabled=false")
	}
	r.State = stateOf(r)
	return r
}

// ── Sonarr / Radarr ─────────────────────────────────────────────────────────────────────────────────────────────

var apiKeyRE = regexp.MustCompile(`<ApiKey>([^<]+)</ApiKey>`)

func (w *Wirer) arrKey(app string) (string, error) {
	b, err := w.Box.ReadFile(app, "/config/config.xml")
	if err != nil {
		return "", err
	}
	m := apiKeyRE.FindSubmatch(b)
	if m == nil {
		return "", fmt.Errorf("no <ApiKey> in %s's config.xml", app)
	}
	return string(m[1]), nil
}

type arrField struct {
	Name  string      `json:"name"`
	Value interface{} `json:"value,omitempty"`
}

func (w *Wirer) arr(app string, port int, kind, rootKind string, drives []Drive, qbPW, trPW string) Result {
	r := Result{App: app}
	key, err := w.arrKey(app)
	if err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	base := w.URL(app, port) + "/api/v3"
	H := map[string]string{"X-Api-Key": key, "Host": app}
	fail := func(err error) Result { r.State, r.Detail = "error", err.Error(); return r }

	// R-1047 (K7): an install from before app-catalog bc54c01 keeps its library at /media/<kind>; the new template binds
	// the same files at the same path (<drive>/userdata/media). Repair once, through the app's own API, no file moved.
	if err := w.repairOldRoot(app, base, H, rootKind, &r); err != nil {
		return fail(err)
	}

	var tags []struct {
		ID    int    `json:"id"`
		Label string `json:"label"`
	}
	if _, err := w.jsonCall("GET", base+"/tag", H, nil, &tags); err != nil {
		return fail(err)
	}
	tagID := map[string]int{}
	for _, t := range tags {
		tagID[t.Label] = t.ID
	}
	for _, d := range drives {
		if _, ok := tagID[d.Tag()]; ok {
			continue
		}
		var t struct {
			ID int `json:"id"`
		}
		if _, err := w.jsonCall("POST", base+"/tag", H, map[string]string{"label": d.Tag()}, &t); err != nil {
			return fail(err)
		}
		tagID[d.Tag()] = t.ID
		r.Wrote = append(r.Wrote, "tag "+d.Tag())
	}

	var roots []struct {
		Path string `json:"path"`
	}
	if _, err := w.jsonCall("GET", base+"/rootfolder", H, nil, &roots); err != nil {
		return fail(err)
	}
	have := map[string]bool{}
	for _, x := range roots {
		have[strings.TrimRight(x.Path, "/")] = true
	}
	for _, d := range drives {
		p := filepath.Join(d.Media(), rootKind)
		if have[p] {
			continue
		}
		if _, err := w.jsonCall("POST", base+"/rootfolder", H, map[string]string{"path": p}, nil); err != nil {
			return fail(err)
		}
		r.Wrote = append(r.Wrote, "rootfolder "+p)
	}

	var clients []struct {
		Name string `json:"name"`
	}
	if _, err := w.jsonCall("GET", base+"/downloadclient", H, nil, &clients); err != nil {
		return fail(err)
	}
	names := map[string]bool{}
	for _, c := range clients {
		names[c.Name] = true
	}
	var schema []map[string]interface{}
	schemaRead := false
	for _, d := range drives {
		type want struct {
			impl, name string
			vals       map[string]interface{}
			present    bool
		}
		ws := []want{
			{"QBittorrent", "qBittorrent " + d.Tag(), map[string]interface{}{"host": "qbittorrent", "port": 8080, "username": "admin", "password": qbPW,
				kind + "Category": map[string]string{"tv": "tv", "movie": "movies"}[kind] + "-" + d.Tag()}, w.Box.Running("qbittorrent")},
			{"Transmission", "Transmission " + d.Tag(), map[string]interface{}{"host": "transmission", "port": 9091, "username": "admin", "password": trPW,
				"urlBase": "/transmission/", kind + "Category": "", kind + "Directory": filepath.Join(d.Media(), "transmission", rootKind)}, w.Box.Running("transmission")},
		}
		for _, x := range ws {
			if !x.present || names[x.name] {
				continue
			}
			if !schemaRead {
				if _, err := w.jsonCall("GET", base+"/downloadclient/schema", H, nil, &schema); err != nil {
					return fail(err)
				}
				schemaRead = true
			}
			var body map[string]interface{}
			for _, s := range schema {
				if s["implementation"] == x.impl {
					b, _ := json.Marshal(s)
					_ = json.Unmarshal(b, &body)
				}
			}
			if body == nil {
				return fail(fmt.Errorf("no %s download client in %s's schema", x.impl, app))
			}
			body["name"], body["enable"], body["tags"], body["priority"] = x.name, true, []int{tagID[d.Tag()]}, 1
			if fs, ok := body["fields"].([]interface{}); ok {
				for _, f := range fs {
					fm, _ := f.(map[string]interface{})
					if v, ok := x.vals[fmt.Sprint(fm["name"])]; ok {
						fm["value"] = v
					}
				}
			}
			if _, err := w.jsonCall("POST", base+"/downloadclient", H, body, nil); err != nil {
				return fail(fmt.Errorf("%s: %v (the app's own connection test may have refused it)", x.name, err))
			}
			r.Wrote = append(r.Wrote, "downloadclient "+x.name)
		}
	}

	var mm map[string]interface{}
	if _, err := w.jsonCall("GET", base+"/config/mediamanagement", H, nil, &mm); err != nil {
		return fail(err)
	}
	if v, _ := mm["minimumFreeSpaceWhenImporting"].(float64); int(v) < MinFreeMB {
		mm["minimumFreeSpaceWhenImporting"] = MinFreeMB
		if _, err := w.jsonCall("PUT", fmt.Sprintf("%s/config/mediamanagement/%v", base, mm["id"]), H, mm, nil); err != nil {
			return fail(err)
		}
		r.Wrote = append(r.Wrote, fmt.Sprintf("minimumFreeSpaceWhenImporting=%d", MinFreeMB))
	}
	r.State = stateOf(r)
	return r
}

// ── Prowlarr ────────────────────────────────────────────────────────────────────────────────────────────────────

func (w *Wirer) prowlarr() Result {
	r := Result{App: "prowlarr"}
	key, err := w.arrKey("prowlarr")
	if err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	base := w.URL("prowlarr", 9696) + "/api/v1"
	H := map[string]string{"X-Api-Key": key, "Host": "prowlarr"}
	var apps []struct {
		Name string `json:"name"`
	}
	if _, err := w.jsonCall("GET", base+"/applications", H, nil, &apps); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	have := map[string]bool{}
	for _, a := range apps {
		have[a.Name] = true
	}
	var schema []map[string]interface{}
	for _, x := range []struct {
		impl string
		port int
	}{{"Sonarr", 8989}, {"Radarr", 7878}} {
		app := strings.ToLower(x.impl)
		if have[x.impl] || !w.Box.Running(app) {
			continue
		}
		appKey, err := w.arrKey(app)
		if err != nil {
			r.State, r.Detail = "error", err.Error()
			return r
		}
		if schema == nil {
			if _, err := w.jsonCall("GET", base+"/applications/schema", H, nil, &schema); err != nil {
				r.State, r.Detail = "error", err.Error()
				return r
			}
		}
		var body map[string]interface{}
		for _, s := range schema {
			if s["implementation"] == x.impl {
				b, _ := json.Marshal(s)
				_ = json.Unmarshal(b, &body)
			}
		}
		if body == nil {
			r.State, r.Detail = "error", "no "+x.impl+" in Prowlarr's schema"
			return r
		}
		vals := map[string]interface{}{"prowlarrUrl": "http://prowlarr:9696", "baseUrl": fmt.Sprintf("http://%s:%d", app, x.port), "apiKey": appKey}
		if fs, ok := body["fields"].([]interface{}); ok {
			for _, f := range fs {
				fm, _ := f.(map[string]interface{})
				if v, ok := vals[fmt.Sprint(fm["name"])]; ok {
					fm["value"] = v
				}
			}
		}
		body["name"], body["syncLevel"], body["tags"] = x.impl, "fullSync", []int{}
		if _, err := w.jsonCall("POST", base+"/applications", H, body, nil); err != nil {
			r.State, r.Detail = "error", err.Error()
			return r
		}
		r.Wrote = append(r.Wrote, "application "+x.impl)
	}
	r.State = stateOf(r)
	return r
}

// ── Plex ────────────────────────────────────────────────────────────────────────────────────────────────────────

// PlexPrefsPath is the server's own preferences file inside the container.
const PlexPrefsPath = "/config/Library/Application Support/Plex Media Server/Preferences.xml"

var plexTokenRE = regexp.MustCompile(`PlexOnlineToken="([^"]+)"`)

// PlexToken reads the server's own PlexOnlineToken at use (decision 248). "" when the server is not claimed.
func PlexToken(box Box) string {
	b, err := box.ReadFile("plex", PlexPrefsPath)
	if err != nil {
		return ""
	}
	if m := plexTokenRE.FindSubmatch(b); m != nil {
		return string(m[1])
	}
	return ""
}

// coveredByMedia: the drive whose media folder the player's template binds at /media — its library folders are already
// in the library as /media/<kind> (the one-drive layout), so they are not added a second time at the same-path name.
func (w *Wirer) coveredByMedia(container string) string {
	src := w.Box.Mounts(container)["/media"]
	if src == "" {
		return ""
	}
	return filepath.Clean(src)
}

func (w *Wirer) plex(drives []Drive) Result {
	r := Result{App: "plex"}
	tok := PlexToken(w.Box)
	if tok == "" {
		r.State, r.Detail = "household", "Plex is not claimed yet — claim it on its page first"
		return r
	}
	base := w.URL("plex", 32400)
	H := map[string]string{"Accept": "application/json", "X-Plex-Token": tok}
	var secs struct {
		MediaContainer struct {
			Directory []struct {
				Key      string `json:"key"`
				Type     string `json:"type"`
				Title    string `json:"title"`
				Agent    string `json:"agent"`
				Scanner  string `json:"scanner"`
				Language string `json:"language"`
				Location []struct {
					Path string `json:"path"`
				} `json:"Location"`
			} `json:"Directory"`
		} `json:"MediaContainer"`
	}
	if _, err := w.jsonCall("GET", base+"/library/sections", H, nil, &secs); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	sub := map[string]string{"show": "tv", "movie": "movies"}
	coveredPlex := w.coveredByMedia("plex")
	for _, s := range secs.MediaContainer.Directory {
		k, ok := sub[s.Type]
		if !ok {
			continue
		}
		var have []string
		haveSet := map[string]bool{}
		for _, l := range s.Location {
			have = append(have, l.Path)
			haveSet[strings.TrimRight(l.Path, "/")] = true
		}
		var missing []string
		for _, d := range drives {
			p := filepath.Join(d.Media(), k)
			if d.Media() == coveredPlex && haveSet["/media/"+k] {
				continue
			}
			if !haveSet[p] {
				missing = append(missing, p)
			}
		}
		if len(missing) == 0 {
			continue
		}
		q := url.Values{"name": {s.Title}, "type": {s.Type}, "agent": {s.Agent}, "scanner": {s.Scanner}, "language": {s.Language}}
		for _, p := range append(have, missing...) {
			q.Add("location", p)
		}
		if c, _, _, err := w.do("PUT", base+"/library/sections/"+s.Key+"?"+q.Encode(), H, nil, ""); err != nil || c >= 300 {
			r.State, r.Detail = "error", fmt.Sprintf("library %s: HTTP %d %v", s.Title, c, err)
			return r
		}
		_, _, _, _ = w.do("GET", base+"/library/sections/"+s.Key+"/refresh", H, nil, "")
		r.Wrote = append(r.Wrote, fmt.Sprintf("library %s +%d folder(s), scan", s.Title, len(missing)))
	}
	var prefs struct {
		MediaContainer struct {
			Setting []struct {
				ID    string      `json:"id"`
				Value interface{} `json:"value"`
			} `json:"Setting"`
		} `json:"MediaContainer"`
	}
	if _, err := w.jsonCall("GET", base+"/:/prefs", H, nil, &prefs); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	for _, id := range []string{"FSEventLibraryUpdatesEnabled", "FSEventLibraryPartialScanEnabled"} {
		on := false
		for _, s := range prefs.MediaContainer.Setting {
			if s.ID == id && s.Value == true {
				on = true
			}
		}
		if on {
			continue
		}
		if c, _, _, err := w.do("PUT", base+"/:/prefs?"+id+"=1", H, nil, ""); err != nil || c >= 300 {
			r.State, r.Detail = "error", fmt.Sprintf("pref %s: HTTP %d %v", id, c, err)
			return r
		}
		r.Wrote = append(r.Wrote, id+"=1")
	}
	r.State = stateOf(r)
	return r
}

// ── Jellyfin ────────────────────────────────────────────────────────────────────────────────────────────────────

// JellyfinKeyName is the API key the box uses: made by the household once (Jellyfin → Dashboard → API Keys → +).
const JellyfinKeyName = "felhom"

func (w *Wirer) jellyfin(drives []Drive) Result {
	r := Result{App: "jellyfin"}
	key, err := w.Box.JellyfinKey(JellyfinKeyName)
	if err != nil || key == "" {
		r.State, r.Detail = "household", "no Jellyfin API key named „felhom” — one step on the Jellyfin page"
		return r
	}
	base := w.URL("jellyfin", 8096)
	H := map[string]string{"X-Emby-Token": key}
	var vf []struct {
		Name           string   `json:"Name"`
		CollectionType string   `json:"CollectionType"`
		Locations      []string `json:"Locations"`
	}
	if _, err := w.jsonCall("GET", base+"/Library/VirtualFolders", H, nil, &vf); err != nil {
		r.State, r.Detail = "error", err.Error()
		return r
	}
	sub := map[string]string{"tvshows": "tv", "movies": "movies"}
	coveredJF := w.coveredByMedia("jellyfin")
	for _, v := range vf {
		k, ok := sub[v.CollectionType]
		if !ok {
			continue
		}
		have := map[string]bool{}
		for _, l := range v.Locations {
			have[strings.TrimRight(l, "/")] = true
		}
		for _, d := range drives {
			p := filepath.Join(d.Media(), k)
			if have[p] || (d.Media() == coveredJF && have["/media/"+k]) {
				continue
			}
			body := map[string]interface{}{"Name": v.Name, "PathInfo": map[string]string{"Path": p}}
			if _, err := w.jsonCall("POST", base+"/Library/VirtualFolders/Paths?refreshLibrary=false", H, body, nil); err != nil {
				r.State, r.Detail = "error", err.Error()
				return r
			}
			r.Wrote = append(r.Wrote, "library "+v.Name+" + "+p)
		}
	}
	if len(r.Wrote) > 0 {
		_, _ = w.jsonCall("POST", base+"/Library/Refresh", H, nil, nil)
		r.Wrote = append(r.Wrote, "scan")
	}
	r.State = stateOf(r)
	return r
}

// ── Safe removal: pause / resume only one drive's torrents (R-1044, `15` §10 „safe removal", K3-2) ─────────────────

// PauseOnDrive stops every torrent whose save folder is on the drive (qBittorrent by save_path, Transmission by
// downloadDir) and returns them as "qbit:<hash>" / "trans:<hash>" so the return resumes exactly those.
func (w *Wirer) PauseOnDrive(d Drive) ([]string, error) {
	w.mu.Lock()
	defer w.mu.Unlock()
	prefix := d.Media() + "/"
	var out []string
	if w.Box.Running("qbittorrent") {
		pw, _ := w.Box.Env("qbittorrent", "QBT_ADMIN_PASSWORD")
		base, H, err := w.qbLogin(pw)
		if err != nil {
			return out, err
		}
		var ts []struct {
			Hash     string `json:"hash"`
			SavePath string `json:"save_path"`
			State    string `json:"state"`
		}
		if _, err := w.jsonCall("GET", base+"/api/v2/torrents/info", H, nil, &ts); err != nil {
			return out, err
		}
		var hs []string
		for _, t := range ts {
			if strings.HasPrefix(strings.TrimRight(t.SavePath, "/")+"/", prefix) && !strings.HasPrefix(t.State, "stopped") && !strings.HasPrefix(t.State, "paused") {
				hs = append(hs, t.Hash)
				out = append(out, "qbit:"+t.Hash)
			}
		}
		if len(hs) > 0 {
			f := url.Values{"hashes": {strings.Join(hs, "|")}}
			if c, _, _, err := w.do("POST", base+"/api/v2/torrents/stop", H, strings.NewReader(f.Encode()), "application/x-www-form-urlencoded"); err != nil || c != 200 {
				return out, fmt.Errorf("qBittorrent stop: HTTP %d %v", c, err)
			}
		}
	}
	if w.Box.Running("transmission") {
		pw, _ := w.Box.Env("transmission", "PASS")
		var got struct {
			Arguments struct {
				Torrents []struct {
					HashString  string `json:"hashString"`
					DownloadDir string `json:"downloadDir"`
					Status      int    `json:"status"`
				} `json:"torrents"`
			} `json:"arguments"`
		}
		if err := w.trRPC(pw, "torrent-get", map[string]interface{}{"fields": []string{"hashString", "downloadDir", "status"}}, &got); err != nil {
			return out, err
		}
		var hs []string
		for _, t := range got.Arguments.Torrents {
			if strings.HasPrefix(strings.TrimRight(t.DownloadDir, "/")+"/", prefix) && t.Status != 0 {
				hs = append(hs, t.HashString)
				out = append(out, "trans:"+t.HashString)
			}
		}
		if len(hs) > 0 {
			if err := w.trRPC(pw, "torrent-stop", map[string]interface{}{"ids": hs}, nil); err != nil {
				return out, err
			}
		}
	}
	w.Logger.Printf("[INFO] [mediawire] safe removal of %s: paused %d torrent(s) saved on it", d.Path, len(out))
	return out, nil
}

// Resume starts again exactly the torrents PauseOnDrive returned.
func (w *Wirer) Resume(ids []string) error {
	w.mu.Lock()
	defer w.mu.Unlock()
	var qb, tr []string
	for _, id := range ids {
		if h, ok := strings.CutPrefix(id, "qbit:"); ok {
			qb = append(qb, h)
		} else if h, ok := strings.CutPrefix(id, "trans:"); ok {
			tr = append(tr, h)
		}
	}
	if len(qb) > 0 && w.Box.Running("qbittorrent") {
		pw, _ := w.Box.Env("qbittorrent", "QBT_ADMIN_PASSWORD")
		base, H, err := w.qbLogin(pw)
		if err != nil {
			return err
		}
		f := url.Values{"hashes": {strings.Join(qb, "|")}}
		if c, _, _, err := w.do("POST", base+"/api/v2/torrents/start", H, strings.NewReader(f.Encode()), "application/x-www-form-urlencoded"); err != nil || c != 200 {
			return fmt.Errorf("qBittorrent start: HTTP %d %v", c, err)
		}
	}
	if len(tr) > 0 && w.Box.Running("transmission") {
		pw, _ := w.Box.Env("transmission", "PASS")
		if err := w.trRPC(pw, "torrent-start", map[string]interface{}{"ids": tr}, nil); err != nil {
			return err
		}
	}
	w.Logger.Printf("[INFO] [mediawire] resumed %d torrent(s) paused by a safe removal", len(qb)+len(tr))
	return nil
}

func (w *Wirer) qbLogin(pw string) (string, map[string]string, error) {
	base := w.URL("qbittorrent", 8080)
	form := url.Values{"username": {"admin"}, "password": {pw}}
	code, _, hd, err := w.do("POST", base+"/api/v2/auth/login", map[string]string{"Referer": base}, strings.NewReader(form.Encode()), "application/x-www-form-urlencoded")
	m := regexp.MustCompile(`((?:QBT_)?SID[A-Za-z0-9_]*)=([^;]+)`).FindStringSubmatch(strings.Join(hd.Values("Set-Cookie"), "; "))
	if err != nil || (code != 200 && code != 204) || m == nil { // qBittorrent 5 answers a good login 204 (measured on Tester 1)
		return "", nil, fmt.Errorf("qBittorrent login: HTTP %d %v", code, err)
	}
	return base, map[string]string{"Referer": base, "Cookie": m[1] + "=" + m[2]}, nil
}

func (w *Wirer) trRPC(pw, method string, args map[string]interface{}, out interface{}) error {
	u := w.URL("transmission", 9091) + "/transmission/rpc"
	H := map[string]string{"Authorization": "Basic " + base64.StdEncoding.EncodeToString([]byte("admin:"+pw)), "Host": "transmission:9091"}
	body, _ := json.Marshal(map[string]interface{}{"method": method, "arguments": args})
	for i := 0; i < 2; i++ {
		c, b, hd, err := w.do("POST", u, H, bytes.NewReader(body), "application/json")
		if err != nil {
			return err
		}
		if c == 409 {
			H["X-Transmission-Session-Id"] = hd.Get("X-Transmission-Session-Id")
			continue
		}
		if c != 200 {
			return fmt.Errorf("transmission %s: HTTP %d", method, c)
		}
		if out != nil {
			return json.Unmarshal(b, out)
		}
		return nil
	}
	return fmt.Errorf("transmission %s: no session id", method)
}

// ── Streams (`15` §10: „restart now" cuts a playing stream, K5-4) ────────────────────────────────────────────────

// PlayingStreams counts what Plex and Jellyfin are playing now. Unreadable → 0 with the reason (never blocks).
func (w *Wirer) PlayingStreams() (int, []string) {
	n := 0
	var notes []string
	if w.Box.Running("plex") {
		if tok := PlexToken(w.Box); tok != "" {
			var st struct {
				MediaContainer struct {
					Size int `json:"size"`
				} `json:"MediaContainer"`
			}
			if _, err := w.jsonCall("GET", w.URL("plex", 32400)+"/status/sessions", map[string]string{"Accept": "application/json", "X-Plex-Token": tok}, nil, &st); err == nil {
				n += st.MediaContainer.Size
				if st.MediaContainer.Size > 0 {
					notes = append(notes, fmt.Sprintf("Plex: %d", st.MediaContainer.Size))
				}
			}
		}
	}
	if w.Box.Running("jellyfin") {
		if key, err := w.Box.JellyfinKey(JellyfinKeyName); err == nil && key != "" {
			var ss []struct {
				NowPlayingItem interface{} `json:"NowPlayingItem"`
			}
			if _, err := w.jsonCall("GET", w.URL("jellyfin", 8096)+"/Sessions", map[string]string{"X-Emby-Token": key}, nil, &ss); err == nil {
				k := 0
				for _, s := range ss {
					if s.NowPlayingItem != nil {
						k++
					}
				}
				n += k
				if k > 0 {
					notes = append(notes, fmt.Sprintf("Jellyfin: %d", k))
				}
			}
		}
	}
	return n, notes
}

// repairOldRoot moves an old install's stored paths from /media/<kind> to the same-path folder — ONLY when the container
// no longer has /media bound (the new template is applied, so the old root folder is missing) and the same-path media
// bind exists. Measured on the bench (K7): add the new root, editor rootFolderPath with moveFiles=false, rescan, delete
// the old root; Radarr's collections too. Same inode before and after. Idempotent: once no path is under /media/ it
// does nothing. Pinned by TestRepairOldRoot_K7.
func (w *Wirer) repairOldRoot(app, base string, H map[string]string, rootKind string, r *Result) error {
	mounts := w.Box.Mounts(app)
	if _, old := mounts["/media"]; old {
		return nil // the old template still runs: /media/<kind> is valid there
	}
	newMedia := ""
	for target, src := range mounts {
		if strings.HasSuffix(target, "/userdata/media") && filepath.Clean(src) == target {
			if newMedia == "" || target < newMedia {
				newMedia = target
			}
		}
	}
	if newMedia == "" {
		return nil
	}
	oldRoot := "/media/" + rootKind
	newRoot := filepath.Join(newMedia, rootKind)
	kind, ids, editor, rescan := "series", "seriesIds", "/series/editor", "RescanSeries"
	if app == "radarr" {
		kind, ids, editor, rescan = "movie", "movieIds", "/movie/editor", "RescanMovie"
	}
	var items []struct {
		ID   int    `json:"id"`
		Path string `json:"path"`
	}
	if _, err := w.jsonCall("GET", base+"/"+kind, H, nil, &items); err != nil {
		return err
	}
	var move []int
	for _, it := range items {
		if strings.HasPrefix(it.Path, oldRoot+"/") {
			move = append(move, it.ID)
		}
	}
	var roots []struct {
		ID   int    `json:"id"`
		Path string `json:"path"`
	}
	if _, err := w.jsonCall("GET", base+"/rootfolder", H, nil, &roots); err != nil {
		return err
	}
	oldID, haveNew := 0, false
	for _, x := range roots {
		switch strings.TrimRight(x.Path, "/") {
		case oldRoot:
			oldID = x.ID
		case newRoot:
			haveNew = true
		}
	}
	if len(move) == 0 && oldID == 0 {
		return nil
	}
	if !haveNew {
		if _, err := w.jsonCall("POST", base+"/rootfolder", H, map[string]string{"path": newRoot}, nil); err != nil {
			return err
		}
		r.Wrote = append(r.Wrote, "rootfolder "+newRoot+" (old install)")
	}
	if len(move) > 0 {
		body := map[string]interface{}{ids: move, "rootFolderPath": newRoot, "moveFiles": false}
		if _, err := w.jsonCall("PUT", base+editor, H, body, nil); err != nil {
			return err
		}
		_, _ = w.jsonCall("POST", base+"/command", H, map[string]string{"name": rescan}, nil)
		r.Wrote = append(r.Wrote, fmt.Sprintf("moved %d %s from %s to %s (no file moved)", len(move), kind, oldRoot, newRoot))
	}
	if app == "radarr" {
		var cols []struct {
			ID             int    `json:"id"`
			RootFolderPath string `json:"rootFolderPath"`
		}
		if _, err := w.jsonCall("GET", base+"/collection", H, nil, &cols); err == nil {
			var cids []int
			for _, c := range cols {
				if strings.TrimRight(c.RootFolderPath, "/") == oldRoot {
					cids = append(cids, c.ID)
				}
			}
			if len(cids) > 0 {
				if _, err := w.jsonCall("PUT", base+"/collection", H, map[string]interface{}{"collectionIds": cids, "rootFolderPath": newRoot}, nil); err != nil {
					w.Logger.Printf("[WARN] [mediawire] radarr: moving %d collection(s) to %s: %v", len(cids), newRoot, err)
				} else {
					r.Wrote = append(r.Wrote, fmt.Sprintf("moved %d collection(s) to %s", len(cids), newRoot))
				}
			}
		}
	}
	if oldID != 0 {
		if _, err := w.jsonCall("DELETE", fmt.Sprintf("%s/rootfolder/%d", base, oldID), H, nil, nil); err != nil {
			return err
		}
		r.Wrote = append(r.Wrote, "removed the old root folder "+oldRoot)
	}
	w.Logger.Printf("[INFO] [mediawire] %s: an install from before the same-path layout repaired — %s → %s, no file moved (R-1047)", app, oldRoot, newRoot)
	return nil
}