package handlers

import "testing"

// The collection chain's curated order (plan §10 R2): the resolver
// reads view_settings.chain_order, tolerates absent/corrupt docs, and
// refuses unknown orders (they mean native).
func TestCollectionChainOrder(t *testing.T) {
	cases := []struct {
		name string
		vs   string
		want string
	}{
		{"absent doc", "", ""},
		{"empty object", `{}`, ""},
		{"reverse", `{"chain_order":"reverse"}`, "reverse"},
		{"newest", `{"chain_order":"newest"}`, "newest"},
		{"merged with toggles", `{"hide_finished":true,"chain_order":"oldest"}`, "oldest"},
		{"unknown order means native", `{"chain_order":"shuffle"}`, ""},
		{"non-string means native", `{"chain_order":3}`, ""},
		{"corrupt doc means native", `not json`, ""},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := CollectionChainOrder([]byte(tc.vs)); got != tc.want {
				t.Fatalf("CollectionChainOrder(%s) = %q, want %q", tc.vs, got, tc.want)
			}
		})
	}
}