package gateway

import "testing"

// The reason a 400 gives is the whole diagnosis, and it used to be thrown away.
//
// A deployment answered every single run with "The agent could not finish —
// something it needed did not answer." Retrieval worked, the run was created,
// the provider was reached, and the trajectory recorded `gateway.invalid_request`
// and nothing else. The actual cause was one sentence long and Anthropic had
// sent it: the account was out of credit. Nothing a client, a log or a run
// detail could show said so, because `translate` dropped the body.
//
// The envelope below is the real one, copied from that response.
func TestAnthropicErrorMessage(t *testing.T) {
	cases := []struct {
		name string
		raw  string
		want string
	}{
		{
			name: "the outage this test exists for",
			raw: `{"type":"error","error":{"type":"invalid_request_error",` +
				`"message":"Your credit balance is too low to access the Anthropic API. ` +
				`Please go to Plans & Billing to upgrade or purchase credits."},` +
				`"request_id":"req_011CeiJqr8rTdpbZYhcL6VHG"}`,
			want: "Your credit balance is too low to access the Anthropic API. " +
				"Please go to Plans & Billing to upgrade or purchase credits.",
		},
		{
			name: "a message-less envelope falls back to the type",
			raw:  `{"type":"error","error":{"type":"overloaded_error"}}`,
			want: "overloaded_error",
		},
		// Best-effort by design: a failure to read a failure must not become a
		// second failure.
		{name: "unparseable body yields nothing", raw: `not json at all`, want: ""},
		{name: "empty body yields nothing", raw: ``, want: ""},
	}

	for _, c := range cases {
		if got := anthropicErrorMessage(c.raw); got != c.want {
			t.Errorf("%s: anthropicErrorMessage() = %q, want %q", c.name, got, c.want)
		}
	}
}