package main

import (
	"bytes"
	"context"
	"reflect"
	"strings"
	"testing"
)

// novox/hq ADR 0217: no change to a machine takes effect unseen.

// The layer of 2026-10-05: a media server's node layer, and the one that replaced it, which kept
// `places` and lost three of its four directories and every other key.
var before = map[string]any{
	"puid": 1000.0, "pgid": 1000.0,
	"expose": map[string]any{"32400": "anywhere"},
	"places": map[string]any{
		"config":    map[string]any{"path": "/srv/media/config", "owner": "1000:1000"},
		"data":      map[string]any{"path": "/srv/media/data", "owner": "1000:1000"},
		"transcode": map[string]any{"path": "/srv/media/temp", "owner": "1000:1000"},
	},
}

func TestASettingThatKeepsAKeyAndLosesItsEntriesIsSaidToRemoveThem(t *testing.T) {
	after := map[string]any{"places": map[string]any{
		"previews": map[string]any{"path": "/srv/pool/previews", "owner": "1000:1000"},
	}}
	added, changed, removed := settingsChange(before, after)
	if !reflect.DeepEqual(added, []string{"places.previews.owner", "places.previews.path"}) {
		t.Errorf("added %v", added)
	}
	if len(changed) != 0 {
		t.Errorf("changed %v", changed)
	}
	for _, lost := range []string{"expose.32400", "pgid", "places.config.path", "places.data.owner", "puid"} {
		found := false
		for _, r := range removed {
			found = found || r == lost
		}
		if !found {
			t.Errorf("removing %s was not said: %v", lost, removed)
		}
	}
}

func TestASettingThatOnlyAddsOrChangesRemovesNothing(t *testing.T) {
	after := map[string]any{
		"puid": 1001.0, "pgid": 1000.0,
		"expose": map[string]any{"32400": "anywhere"},
		"places": map[string]any{
			"config":    map[string]any{"path": "/srv/media/config", "owner": "1000:1000"},
			"data":      map[string]any{"path": "/srv/media/data", "owner": "1000:1000"},
			"transcode": map[string]any{"path": "/srv/media/temp", "owner": "1000:1000"},
			"previews":  map[string]any{"path": "/srv/pool/previews", "owner": "1000:1000"},
		},
	}
	_, changed, removed := settingsChange(before, after)
	if len(removed) != 0 {
		t.Errorf("an additive set was said to remove %v", removed)
	}
	if !reflect.DeepEqual(changed, []string{"puid"}) {
		t.Errorf("changed %v", changed)
	}
}

// What was sent, as a push would send it: a media server's container and a file with a secret.
func declaration(configFrom string, extra ...string) []byte {
	vols := `"` + configFrom + `:/config", "/srv/media/data:/data"`
	for _, e := range extra {
		vols += `, "` + e + `"`
	}
	return []byte(`{"declaration":1,"sequence":7,"resources":[
		{"id":"plex.server","type":"container","image":"plex@sha256:aa","volumes":[` + vols + `]},
		{"id":"plex.env","type":"file","path":"/srv/media/env","content":"TOKEN=the-secret-itself"}]}`)
}

func summarized(t *testing.T, body []byte) []sentResource {
	t.Helper()
	s, err := summarize(body)
	if err != nil {
		t.Fatal(err)
	}
	return s
}

func TestWhatIsKeptOfASendHoldsNoFileContent(t *testing.T) {
	s := summarized(t, declaration("/srv/media/config"))
	var kept bytes.Buffer
	for _, r := range s {
		kept.WriteString(r.ID + r.Type + r.Digest + strings.Join(r.Volumes, ","))
		for k, v := range r.Fields {
			kept.WriteString(k + v)
		}
	}
	if strings.Contains(kept.String(), "the-secret-itself") {
		t.Fatal("a file's content was kept in the record of what was sent")
	}
	if len(s) != 2 || s[0].Volumes[0] != "/srv/media/config:/config" {
		t.Fatalf("summary %+v", s)
	}
}

func TestADiffOfAnUnchangedMachineIsEmptyAndAChangedContainerNamesItsField(t *testing.T) {
	was := summarized(t, declaration("/srv/media/config"))
	if d := diffSent(was, summarized(t, declaration("/srv/media/config"))); !d.empty() {
		t.Fatalf("an unchanged machine differs: %+v", d)
	}
	d := diffSent(was, summarized(t, declaration("/var/lib/plex/config")))
	if len(d.Changed) != 1 || d.Changed[0].ID != "plex.server" || !reflect.DeepEqual(d.Changed[0].Fields, []string{"volumes"}) {
		t.Fatalf("diff %+v", d)
	}
	var out bytes.Buffer
	writeDiff(&out, "home", d, movesIn(was, summarized(t, declaration("/var/lib/plex/config"))))
	for _, want := range []string{"~ plex.server recreated: volumes", "! plex.server: /config moves from /srv/media/config to /var/lib/plex/config"} {
		if !strings.Contains(out.String(), want) {
			t.Errorf("diff does not say %q:\n%s", want, out.String())
		}
	}
}

// The incident: the configuration mount would move to an empty default directory.
func TestARunningContainersDataMovingIsAMoveAndAnAddedMountIsNot(t *testing.T) {
	was := summarized(t, declaration("/srv/media/config"))
	moves := movesIn(was, summarized(t, declaration("/var/lib/plex/config")))
	want := []dataMove{{Container: "plex.server", Inside: "/config", From: "/srv/media/config", To: "/var/lib/plex/config"}}
	if !reflect.DeepEqual(moves, want) {
		t.Fatalf("moves %+v", moves)
	}
	if moves[0].Module() != "plex" {
		t.Errorf("module %q", moves[0].Module())
	}
	// A mount added — the previews of 2026-10-05 — is not a move.
	if m := movesIn(was, summarized(t, declaration("/srv/media/config", "/srv/pool/previews:/config/Media"))); len(m) != 0 {
		t.Errorf("an added mount was held as a move: %+v", m)
	}
	// Nor is a container the machine never ran.
	if m := movesIn(nil, was); len(m) != 0 {
		t.Errorf("a first send was held as a move: %+v", m)
	}
}

func TestAPushNamingNoMachineIsRefusedUnlessItSaysAll(t *testing.T) {
	err := pushCommand(context.Background(), nil)
	if err == nil || !strings.Contains(err.Error(), "--all") {
		t.Fatalf("a bare push was not refused: %v", err)
	}
	if err := pushCommand(context.Background(), []string{"--all", "--behind"}); err == nil {
		t.Fatal("--all with --behind was accepted")
	}
}

func TestTheVerbsCarryReadReplaceAndMove(t *testing.T) {
	for _, c := range []struct {
		verb string
		args map[string]any
		want []string
	}{
		{"settings", map[string]any{"module": "plex", "node": "home"}, []string{"settings", "show", "plex", "--node", "home"}},
		{"settings", map[string]any{"module": "plex", "history": "true"}, []string{"settings", "show", "plex", "--history"}},
		{"settings", map[string]any{"module": "plex", "values": "{}", "replace": "true"}, []string{"settings", "set", "plex", "{}", "--replace"}},
		{"push", map[string]any{"node": "home", "move": "plex", "why": "w"},
			[]string{"push", "home", "--wait", "0", "--move", "plex", "--why", "w"}},
		{"push", map[string]any{"why": "w"}, []string{"push", "--behind", "--wait", "0", "--why", "w"}},
		{"plan", map[string]any{"node": "home", "diff": "true"}, []string{"plan", "home", "--diff"}},
	} {
		got, err := argvFor(c.verb, c.args)
		if err != nil || !reflect.DeepEqual(got, c.want) {
			t.Errorf("%s %v: %v %v, want %v", c.verb, c.args, got, err, c.want)
		}
	}
}

// An argument of the guards given where it cannot take effect is refused, not passed over (issue 244):
// a move with no machine named, a replace beside a clear, a history beside values, a diff beside files.
func TestTheGuardsArgumentsAreNotPassedOver(t *testing.T) {
	for _, c := range []struct {
		verb string
		args map[string]any
	}{
		{"push", map[string]any{"move": "plex", "why": "w"}},
		{"settings", map[string]any{"module": "plex", "clear": "true", "replace": "true"}},
		{"settings", map[string]any{"module": "plex", "values": "{}", "history": "true"}},
		{"plan", map[string]any{"node": "home", "files": "true", "diff": "true"}},
	} {
		if argv, err := argvFor(c.verb, c.args); err == nil {
			t.Errorf("%s %v was taken as %v, and an argument passed over", c.verb, c.args, argv)
		}
	}
}