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")
	}
}