package config

import (
	"fmt"
	"os"
	"time"
)

type Config struct {
	HTTPAddr     string
	WSAddr       string
	MQTTHost     string
	MQTTUser     string
	MQTTPass     string
	MQTTClientID string
	KafkaURL     string
	DBHost       string
	DBUser       string
	DBPass       string
	DBName       string
	HTTPClientID string
	ClientSecret string
	HTTPUsername string
	HTTPPassword string
	HTTPAudience string
	ConfigPath   string
	APIBaseURL   string
	APIAuthURL   string
	// TLSInsecureSkipVerify enables skipping TLS cert verification (e.g. for dev); default false.
	TLSInsecureSkipVerify bool
}

func getEnv(key, def string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return def
}

func getEnvBool(key string, defaultVal bool) bool {
	switch os.Getenv(key) {
	case "1", "true", "TRUE", "yes":
		return true
	case "0", "false", "FALSE", "no":
		return false
	}
	return defaultVal
}

func getEnvPanic(key string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	panic(fmt.Sprintf("environment variable %s is not set", key))
}

func Load() *Config {
	return &Config{
		HTTPAddr:     getEnv("HTTP_HOST_PATH", "0.0.0.0:1902"),
		WSAddr:       getEnv("HTTPWS_HOST_PATH", "0.0.0.0:8088"),
		MQTTHost:     getEnv("MQTT_HOST", "192.168.1.101"),
		MQTTUser:     getEnvPanic("MQTT_USERNAME"),
		MQTTPass:     getEnvPanic("MQTT_PASSWORD"),
		MQTTClientID: getEnvPanic("MQTT_CLIENT_ID"),
		KafkaURL:     getEnv("KAFKA_URL", "127.0.0.1:9092"),
		DBHost:       getEnv("DBHost", "127.0.0.1"),
		DBUser:       getEnvPanic("DBUser"),
		DBPass:       getEnvPanic("DBPass"),
		DBName:       getEnv("DBName", "go_crud_db"),
		HTTPClientID: getEnvPanic("HTTPClientID"),
		ClientSecret: getEnvPanic("ClientSecret"),
		HTTPUsername: getEnvPanic("HTTPUsername"),
		HTTPPassword: getEnvPanic("HTTPPassword"),
		HTTPAudience: getEnvPanic("HTTPAudience"),
		ConfigPath:             getEnv("CONFIG_PATH", "/app/cmd/server/config.json"),
		APIBaseURL:             getEnv("API_BASE_URL", "https://10.251.0.30:5050"),
		TLSInsecureSkipVerify:  getEnvBool("TLS_INSECURE_SKIP_VERIFY", false),
	}
}

func LoadDecoder() *Config {
	return &Config{
		KafkaURL: getEnv("KAFKA_URL", "127.0.0.1:9092"),
	}
}

func LoadServer() *Config {
	return &Config{
		KafkaURL:     getEnv("KAFKA_URL", "127.0.0.1:9092"),
		HTTPAddr:     getEnv("HTTP_HOST_PATH", "0.0.0.0:1902"),
		DBHost:       getEnv("DBHost", "127.0.0.1"),
		DBUser:       getEnvPanic("DBUser"),
		DBPass:       getEnvPanic("DBPass"),
		DBName:       getEnv("DBName", "go_crud_db"),
		HTTPClientID: getEnvPanic("HTTPClientID"),
		ClientSecret: getEnvPanic("ClientSecret"),
		HTTPUsername: getEnvPanic("HTTPUsername"),
		HTTPPassword: getEnvPanic("HTTPPassword"),
		HTTPAudience: getEnvPanic("HTTPAudience"),
		ConfigPath:             getEnv("CONFIG_PATH", "/app/cmd/server/config.json"),
		APIBaseURL:             getEnv("API_BASE_URL", "https://10.251.0.30:5050"),
		APIAuthURL:             getEnv("API_AUTH_URL", "https://10.251.0.30:10002"),
		TLSInsecureSkipVerify:  getEnvBool("TLS_INSECURE_SKIP_VERIFY", false),
	}
}

func LoadBridge() *Config {
	return &Config{
		KafkaURL:     getEnv("KAFKA_URL", "127.0.0.1:9092"),
		MQTTHost:     getEnv("MQTT_HOST", "192.168.1.101"),
		MQTTUser:     getEnvPanic("MQTT_USERNAME"),
		MQTTPass:     getEnvPanic("MQTT_PASSWORD"),
		MQTTClientID: getEnvPanic("MQTT_CLIENT_ID"),
	}
}

func LoadLocation() *Config {
	return &Config{
		KafkaURL:              getEnv("KAFKA_URL", "127.0.0.1:9092"),
		TLSInsecureSkipVerify: getEnvBool("TLS_INSECURE_SKIP_VERIFY", false),
	}
}

const (
	SMALL_CHANNEL_SIZE     = 200
	MEDIUM_CHANNEL_SIZE    = 500
	LARGE_CHANNEL_SIZE     = 2000
	SMALL_TICKER_INTERVAL  = 1 * time.Second
	MEDIUM_TICKER_INTERVAL = 2 * time.Second
	LARGE_TICKER_INTERVAL  = 5 * time.Second
)