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package logic

import (
	"io"
	"os"
	"path/filepath"
	"rss_parrot/shared"
	"testing"
	"time"
)

func TestProfilerPurgesOnlyItsOwnOldDumps(t *testing.T) {
	dir := t.TempDir()
	now := time.Date(2026, 10, 28, 12, 0, 0, 0, time.UTC)
	old := now.AddDate(0, 0, -10)

	write := func(name string, mtime time.Time) string {
		t.Helper()
		p := filepath.Join(dir, name)
		if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(p, []byte("x"), 0o644); err != nil {
			t.Fatal(err)
		}
		if err := os.Chtimes(p, mtime, mtime); err != nil {
			t.Fatal(err)
		}
		return p
	}
	oldDump := write(old.Format(dumpTimeFormat)+".txt", old)
	newDump := write(now.Add(-time.Hour).Format(dumpTimeFormat)+".txt", now.Add(-time.Hour))
	// Anything else in the directory is left alone, however old.
	others := []string{
		write("kakapo.db", old),
		write("notes.txt", old),
		write("sub/"+old.Format(dumpTimeFormat)+".txt", old),
	}

	if err := purgeOld(dir, 7, now); err != nil {
		t.Fatal(err)
	}
	if _, err := os.Stat(oldDump); !os.IsNotExist(err) {
		t.Errorf("old dump %s was kept", oldDump)
	}
	for _, p := range append(others, newDump) {
		if _, err := os.Stat(p); err != nil {
			t.Errorf("%s was deleted", p)
		}
	}
}

func TestProfilerDumpNameMatchesWhatItWrites(t *testing.T) {
	dir := t.TempDir()
	now := time.Date(2026, 10, 28, 12, 0, 0, 0, time.UTC)
	if err := saveProfile(dir, now); err != nil {
		t.Fatal(err)
	}
	entries, err := os.ReadDir(dir)
	if err != nil || len(entries) != 1 {
		t.Fatalf("dir holds %v, %v; want one dump", entries, err)
	}
	if name := entries[0].Name(); !dumpName.MatchString(name) {
		t.Errorf("dump %q does not match dumpName, so it would never be purged", name)
	}
}

func TestProfilerOffWithoutProfileDir(t *testing.T) {
	// A profiler that runs would start a goroutine writing a dump every
	// minute for the rest of the test binary; only the unset case is run.
	prof := NewProfiler(&shared.Config{}, shared.NewLogger(io.Discard, "Error")).(*profiler)
	if prof.profileDir != "" {
		t.Fatalf("profileDir = %q", prof.profileDir)
	}
	if prof.profileKeepDays != defaultProfileKeepDays {
		t.Errorf("profileKeepDays = %d, want the default %d", prof.profileKeepDays, defaultProfileKeepDays)
	}
	if prof.running {
		t.Error("the dump loop runs without profile_dir; it used to write into the working directory")
	}
}