package stacks

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// R-621 (the open half): the hold keeps the app's own log, and the logs a person can READ — the logs
// page, /api/stacks/<n>/logs, the operator's remote diagnostics, all through GetLogs — now show it
// when the held app has no live output. Before this, GetLogs returned "" for a held app (no
// containers), so the kept file was reachable only by a shell on the box.
func TestR621_GetLogsFallsBackToTheHoldLog(t *testing.T) {
	m, dir := newPinManager(t, pinTplOld, pinTplNew, "deployed: true\nenv: {}\n")
	live := ""
	m.logsComposeFn = func(string, ...string) (string, error) { return live, nil }

	// No hold log yet: an empty live log stays empty (nothing invented).
	if got, err := m.GetLogs("nextcloud", 200); err != nil || got != "" {
		t.Fatalf("no hold log: got %q, %v", got, err)
	}

	for ts, body := range map[string]string{
		"20260921T211700Z": "web-1 | OLDER hold\n",
		"20260922T080000Z": "web-1 | Applying migration 0009... OK\nweb-1 | never bound :8000\n",
		"20260923T000000Z": "   \n", // a newer, EMPTY capture must not hide the useful one
	} {
		p := filepath.Join(dir, "hold-logs", ts)
		if err := os.MkdirAll(p, 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(p, "compose-logs.txt"), []byte(body), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	got, err := m.GetLogs("nextcloud", 200)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(got, "never bound :8000") || !strings.HasPrefix(got, "--- hold-logs/20260922T080000Z/compose-logs.txt ---\n") {
		t.Fatalf("R-621: a held app's logs must show the newest non-empty kept log under its header, got %q", got)
	}
	if strings.Contains(got, "OLDER hold") {
		t.Errorf("only the newest kept log is served, got %q", got)
	}

	// A running app's own output always wins over a kept log.
	live = "web-1 | serving\n"
	if got, _ := m.GetLogs("nextcloud", 200); got != live {
		t.Errorf("live output must win over the hold log, got %q", got)
	}
}