package main

import (
	"testing"

	"github.com/kkyr/fig"
)

// TestExampleConfigValidates ensures the shipped config.example.yaml parses and
// passes cross-field validation, so the documented options stay in sync with the
// config structs.
func TestExampleConfigValidates(t *testing.T) {
	cfg := &Config{Log: &LogConfig{}}
	if err := fig.Load(cfg, fig.File("config.example.yaml"), fig.Dirs(".")); err != nil {
		t.Fatalf("parse config.example.yaml: %s", err)
	}
	if err := cfg.Validate(); err != nil {
		t.Fatalf("validate config.example.yaml: %s", err)
	}
}

// baseConfig returns a minimal valid configuration with one serial device and an
// MQTT source, ready for per-test mutation.
func baseConfig() *Config {
	return &Config{
		Devices: []*DeviceConfig{{
			Name:      "grafik-eye",
			Transport: "serial",
			Serial:    SerialConfig{Device: "/dev/ttyUSB0"},
			Zones:     6,
		}},
		Sources: []*SourceConfig{{
			Name:   "home-assistant",
			Type:   "mqtt",
			Device: "grafik-eye",
			MQTT:   MQTTConfig{Broker: "127.0.0.1", Topic: "lutron/qse-nwk"},
		}},
	}
}

// TestValidateMQTTLights verifies a light controlling zones 1-6 validates and that
// a zone outside the device's range is rejected.
func TestValidateMQTTLights(t *testing.T) {
	c := baseConfig()
	c.Sources[0].MQTT.Lights = []MQTTLightConfig{
		{Name: "All Zones", Topic: "lutron/qse-nwk/all", Zones: []int{1, 2, 3, 4, 5, 6}},
	}
	if err := c.Validate(); err != nil {
		t.Fatalf("valid lights config rejected: %s", err)
	}

	// A zone beyond the device's 6 zones must be rejected.
	c.Sources[0].MQTT.Lights[0].Zones = []int{6, 7}
	if err := c.Validate(); err == nil {
		t.Error("expected error for out-of-range zone")
	}
}

// TestValidateMQTTLightRequirements verifies per-light topic, zone-set, and
// duplicate-topic constraints.
func TestValidateMQTTLightRequirements(t *testing.T) {
	// A light without a topic is rejected.
	c := baseConfig()
	c.Sources[0].MQTT.Lights = []MQTTLightConfig{{Zones: []int{1}}}
	if err := c.Validate(); err == nil {
		t.Error("expected error for missing light topic")
	}

	// A light with no zones is rejected.
	c = baseConfig()
	c.Sources[0].MQTT.Lights = []MQTTLightConfig{{Topic: "lutron/a"}}
	if err := c.Validate(); err == nil {
		t.Error("expected error for light with no zones")
	}

	// Two lights sharing a topic are rejected.
	c = baseConfig()
	c.Sources[0].MQTT.Lights = []MQTTLightConfig{
		{Topic: "lutron/a", Zones: []int{1}},
		{Topic: "lutron/a", Zones: []int{2}},
	}
	if err := c.Validate(); err == nil {
		t.Error("expected error for duplicate light topic")
	}
}

// TestNewMQTTSourceSynthesizesLight verifies that, with no lights configured, a
// single light over every zone is synthesized from the base topic.
func TestNewMQTTSourceSynthesizesLight(t *testing.T) {
	cfg := &SourceConfig{
		Name: "home-assistant",
		Type: "mqtt",
		MQTT: MQTTConfig{Broker: "127.0.0.1", Topic: "lutron/qse-nwk", DeviceName: "Lutron"},
	}
	dev := NewDevice(&DeviceConfig{Name: "grafik-eye", Zones: 6})
	binding := dev.RegisterSource(cfg.Name, cfg.Priority, 0, cfg.Fade)

	s := newMQTTSource(cfg, dev, binding)
	if len(s.lights) != 1 {
		t.Fatalf("expected 1 synthesized light, got %d", len(s.lights))
	}
	l := s.lights[0]
	if l.topic != "lutron/qse-nwk" || l.topicSet != "lutron/qse-nwk/set" {
		t.Errorf("unexpected light topics: %q / %q", l.topic, l.topicSet)
	}
	want := []int{1, 2, 3, 4, 5, 6}
	if len(l.zones) != len(want) {
		t.Fatalf("zones = %v, want %v", l.zones, want)
	}
	for i, z := range want {
		if l.zones[i] != z {
			t.Errorf("zones[%d] = %d, want %d", i, l.zones[i], z)
		}
	}
}