// Fenrir console screen reader.
// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

package speech

import (
	"errors"
	"reflect"
	"testing"
)

func TestRegistryIsTheImplementationAndSelectionBoundary(t *testing.T) {
	available := Drivers()
	if len(available) != 6 || available[0].ID != "speech-dispatcher" || available[0].Open == nil || available[0].Modules == nil {
		t.Fatal(available)
	}
	available[0].ID = "altered"
	if _, err := Find_driver("speech-dispatcher"); err != nil {
		t.Fatal("registry aliased", err)
	}
	if _, err := Open_driver("invented", Options{}); err == nil {
		t.Fatal("unknown driver opened")
	}
	// A supported but locally unavailable backend must not block another driver,
	// and selecting it must never call its constructor or silently fall back.
	original := drivers
	opened := false
	drivers = append(Drivers(), Driver{ID: "fixture", Label: "Fixture", Check: func() error { return errors.New("fixture dependency missing") }, Open: func(Options) (Transport, error) { opened = true; return nil, nil }})
	defer func() { drivers = original }()
	if _, err := Find_driver("fixture"); err != nil {
		t.Fatal("unavailable support disappeared", err)
	}
	if err := Drivers()[0].Availability(); err != nil {
		t.Fatal("unselected dependency blocked supported driver", err)
	}
	if _, err := Open_driver("fixture", Options{}); err == nil || opened {
		t.Fatal("unavailable driver constructed or fell back", opened, err)
	}
}

func TestModuleDiscoveryDoesNotSpeakOrChangeActiveClient(t *testing.T) {
	server := new_fake_server(t, false)
	driver, err := Find_driver("speech-dispatcher")
	if err != nil {
		t.Fatal(err)
	}
	t.Setenv("SPEECHD_ADDRESS", "unix_socket:"+server.path)
	client, err := Open_driver(driver.ID, Options{Rate: 80})
	if err != nil {
		t.Fatal(err)
	}
	defer client.Close()
	modules, err := driver.Modules(Options{})
	if err != nil || !reflect.DeepEqual(modules, []string{"fixture", "other"}) {
		t.Fatal(modules, err)
	}
	select {
	case event := <-server.events:
		t.Fatal("discovery changed speech", event)
	default:
	}
}