package config

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

func TestLoadRequiresDeviceCredentials(t *testing.T) {
	path := filepath.Join(t.TempDir(), "iot.yaml")
	data := []byte("MQTT:\n  Address: 127.0.0.1:1883\nHTTP:\n  Address: 127.0.0.1:12428\n  InternalToken: test\n")
	if err := os.WriteFile(path, data, 0o600); err != nil {
		t.Fatal(err)
	}
	if _, err := Load(path); err == nil {
		t.Fatal("未配置设备凭证时应拒绝启动")
	}
}

func TestLoadDefaultsListenerAndOverridesSingleDevicePassword(t *testing.T) {
	t.Setenv("HEQI_IOT_MQTT_PASSWORD", "from-secret-store")
	path := filepath.Join(t.TempDir(), "iot.yaml")
	data := []byte("MQTT:\n  Address: 127.0.0.1:1883\n  Devices:\n    - ClientID: detector-1\n      DeviceID: '0000000000000001'\n      Username: detector-1\n      Password: placeholder\nHTTP:\n  Address: 127.0.0.1:12428\n  InternalToken: test\n")
	if err := os.WriteFile(path, data, 0o600); err != nil {
		t.Fatal(err)
	}
	cfg, err := Load(path)
	if err != nil {
		t.Fatal(err)
	}
	if cfg.MQTT.ListenerID != "mqtt-tcp" || cfg.MQTT.Devices[0].Password != "from-secret-store" {
		t.Fatalf("unexpected MQTT config: %+v", cfg.MQTT)
	}
}