package bookfile

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

func mk(t *testing.T, cacheDir, kind, key, file string) {
	t.Helper()
	d := filepath.Join(cacheDir, kind, key)
	os.MkdirAll(d, 0o755)
	os.WriteFile(filepath.Join(d, file), []byte("x"), 0o644)
}

func TestSweepStale(t *testing.T) {
	dir := t.TempDir()
	mk(t, dir, "covers", "1-aaa", "cover.jpg")
	mk(t, dir, "covers", "2-bbb", "cover.png")
	mk(t, dir, "pages", "1-aaa", "0.jpg")
	mk(t, dir, "pages", "3-ccc", "0.jpg")
	os.WriteFile(filepath.Join(dir, "covers", "stray.txt"), []byte("x"), 0o644) // 非目录,忽略

	n, err := SweepStale(dir, map[string]bool{"1-aaa": true})
	if err != nil {
		t.Fatal(err)
	}
	if n != 2 {
		t.Fatalf("removed %d want 2", n)
	}
	if _, err := os.Stat(filepath.Join(dir, "covers", "1-aaa")); err != nil {
		t.Fatal("live dir removed")
	}
	if _, err := os.Stat(filepath.Join(dir, "pages", "1-aaa")); err != nil {
		t.Fatal("live pages removed")
	}
	if _, err := os.Stat(filepath.Join(dir, "covers", "2-bbb")); !os.IsNotExist(err) {
		t.Fatal("stale cover remains")
	}
	// cacheDir 不存在 = 首次运行,不算错
	if n, err := SweepStale(filepath.Join(dir, "nope"), nil); n != 0 || err != nil {
		t.Fatalf("%d %v", n, err)
	}
}

func TestPaths(t *testing.T) {
	if DirKey(12, "ab") != "12-ab" {
		t.Fatal("DirKey")
	}
	if CoverDir("/c", "12-ab") != filepath.Join("/c", "covers", "12-ab") {
		t.Fatal("CoverDir")
	}
}