package service

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

func TestFindByVideoID(t *testing.T) {
	lib, dir := newLibrary(t)

	writeItem(t, dir, "alpha", "name = \"Alpha\"\nvideo_id = \"aaa\"\n", nil)
	writeItem(t, dir, "beta", "name = \"Beta\"\nvideo_id = \"bbb\"\n", nil)

	got, ok := lib.FindByVideoID(dir, "aaa")
	if !ok || filepath.Base(got) != "alpha" {
		t.Fatalf("expected to find alpha, got %q ok=%v", got, ok)
	}

	if _, ok := lib.FindByVideoID(dir, "zzz"); ok {
		t.Error("expected no match for unknown id")
	}
	// An empty id never matches.
	if _, ok := lib.FindByVideoID(dir, ""); ok {
		t.Error("expected no match for empty id")
	}
}

func TestPruneToIDSet(t *testing.T) {
	lib, dir := newLibrary(t)

	writeItem(t, dir, "keep", "name = \"Keep\"\nvideo_id = \"k1\"\n", nil)
	writeItem(t, dir, "drop", "name = \"Drop\"\nvideo_id = \"d1\"\n", nil)
	// An item without identity must never be pruned (we can't positively id it).
	writeItem(t, dir, "noid", "name = \"NoId\"\n", nil)

	keep := map[string]bool{"k1": true}
	removed, err := lib.PruneToIDSet(dir, keep)
	if err != nil {
		t.Fatalf("prune: %v", err)
	}
	if removed != 1 {
		t.Errorf("expected 1 removed, got %d", removed)
	}
	if _, err := os.Stat(filepath.Join(dir, "drop")); !os.IsNotExist(err) {
		t.Error("expected 'drop' to be removed")
	}
	if _, err := os.Stat(filepath.Join(dir, "keep")); err != nil {
		t.Error("expected 'keep' to survive")
	}
	if _, err := os.Stat(filepath.Join(dir, "noid")); err != nil {
		t.Error("expected unidentified item to survive")
	}
}

// A symlinked library root used to break cache eviction: the cache is keyed off
// the resolved root, so computing the key from the raw configured path missed,
// and a pruned item stayed visible until the scan TTL expired.
func TestPruneEvictsCacheUnderSymlinkedRoot(t *testing.T) {
	parent := t.TempDir()
	real := filepath.Join(parent, "real")
	link := filepath.Join(parent, "link")
	if err := os.MkdirAll(real, 0o755); err != nil {
		t.Fatalf("mkdir real: %v", err)
	}
	if err := os.Symlink(real, link); err != nil {
		t.Skipf("symlinks unavailable: %v", err)
	}

	lib := NewLibraryService(link, "ffmpeg", "ffprobe")
	writeItem(t, real, "drop", "name = \"Drop\"\nvideo_id = \"d1\"\n", nil)

	// Populate the scan cache, the way a listing or detail page would.
	if _, err := lib.GetByRelPath("drop"); err != nil {
		t.Fatalf("seed cache: %v", err)
	}

	// Prune against the resolved root, which is what resolveBaseLibraryDir hands
	// the production caller.
	removed, err := lib.PruneToIDSet(lib.libraryRoot(), map[string]bool{"other": true})
	if err != nil {
		t.Fatalf("prune: %v", err)
	}
	if removed != 1 {
		t.Fatalf("expected 1 removed, got %d", removed)
	}

	if _, err := lib.GetByRelPath("drop"); err == nil {
		t.Error("pruned item still served from the scan cache")
	}
}