package configuration

import (
	"log"
	"time"

	"github.com/getsentry/sentry-go"
	"github.com/spf13/viper"
)

type Configuration struct {
	NATS struct {
		URL     string `mapstructure:"url"`
		Stream  string `mapstructure:"stream"`
		Subject struct {
			Event string `mapstructure:"event"`
			State string `mapstructure:"state"`
			Temp  string `mapstructure:"temp"`
		} `mapstructure:"subject"`
	} `mapstructure:"nats"`

	HTTP struct {
		Port int16 `mapstructure:"port"`
	} `mapstructure:"http"`

	Sensors struct {
		Wort    string  `mapstructure:"wort"`
		Chamber string  `mapstructure:"chamber"`
		Ambient string  `mapstructure:"ambient"`
		Weight  float64 `mapstructure:"weight"`
	} `mapstructure:"sensors"`

	FermentationTemperature float64 `mapstructure:"fermentation_temp"`
	DeltaTemperatureCool    float64 `mapstructure:"delta_temp_cool"`
	DeltaTemperatureHeat    float64 `mapstructure:"delta_temp_heat"`

	Limits struct {
		MinChamberTemperature float64 `mapstructure:"min_chamber_temp"`
		MaxChamberTemperature float64 `mapstructure:"max_chamber_temp"`
		MinCoolerRuntimeSecs  float64 `mapstructure:"min_cooler_runtime_secs"`
		MaxCoolerRuntimeSecs  float64 `mapstructure:"max_cooler_runtime_secs"`
		MinCoolerCooldownSecs float64 `mapstructure:"min_cooler_cooldown_secs"`
		HeaterGraceTimeSecs   float64 `mapstructure:"heater_grace_time_secs"`
	} `mapstructure:"limits"`

	PID struct {
		Kp float64 `mapstructure:"kp"` // 2.0
		Ki float64 `mapstructure:"ki"` // 0.0001
		Kd float64 `mapstructure:"kd"` // 2.0
	} `mapstructure:"pid"`
}

func LoadConfiguration() *Configuration {
	hub := sentry.CurrentHub().Clone()
	defer hub.Flush(10 * time.Second)

	viper.SetDefault("http.port", 8000)
	viper.SetDefault("nats.stream", "FERMENTOR")
	viper.SetDefault("nats.subject.event", "FERMENTOR.event")
	viper.SetDefault("nats.subject.state", "FERMENTOR.state")
	viper.SetDefault("nats.subject.temp", "FERMENTOR.temp")
	viper.SetDefault("nats.url", "nats.service.consul")
	viper.SetDefault("pid.kd", 2.0)
	viper.SetDefault("pid.ki", 0.0001)
	viper.SetDefault("pid.kp", 2.0)
	viper.SetDefault("limits.heater_grace_time_secs", 1800)
	viper.SetDefault("limits.max_chamber_temp", 40)
	viper.SetDefault("limits.max_cooler_runtime_secs", 86400)
	viper.SetDefault("limits.min_chamber_temp", 5)
	viper.SetDefault("limits.min_cooler_cooldown_secs", 300)
	viper.SetDefault("limits.min_cooler_runtime_secs", 300)
	viper.SetDefault("sensors.weight", 0.8)

	viper.AddConfigPath("/etc")
	viper.AddConfigPath("/usr/local/etc")
	viper.AddConfigPath(".")
	viper.SetConfigName("fermentord")
	viper.SetConfigType("toml")

	if err := viper.ReadInConfig(); err != nil {
		log.Printf("Error loading configuration: %v", err)
	}

	config := &Configuration{}
	if err := viper.Unmarshal(config); err != nil {
		hub.CaptureException(err)
		log.Fatal(err)
	}

	return config
}