package main

import (
	"flag"
	"log"
	"os"
	"strconv"

	"github.com/hashicorp/logutils"
)

// getEnvString returns string from environment variable
func getEnvString(env, def string) (val string) { //nolint:deadcode
	val = os.Getenv(env)

	if val == "" {
		return def
	}

	return
}

// getEnvInt returns int from environment variable
func getEnvInt(env string, def int) (ret int) {
	val := os.Getenv(env)

	if val == "" {
		return def
	}

	ret, err := strconv.Atoi(val)
	if err != nil {
		log.Fatalf("[ERROR] Environment variable is not numeric: %v\n", env)
	}

	return
}

func setLogLevel(l int) {
	switch {
	case l <= 20:
		config.Log.SetMinLevel(logutils.LogLevel("ERROR"))
	case l > 20 && l <= 40:
		config.Log.SetMinLevel(logutils.LogLevel("WARNING"))
	case l > 40 && l <= 60:
		config.Log.SetMinLevel(logutils.LogLevel("INFO"))
	case l > 60 && l <= 80:
		config.Log.SetMinLevel(logutils.LogLevel("DEBUG"))
	case l > 80:
		config.Log.SetMinLevel(logutils.LogLevel("TRACE"))
	}
}

func initialize() {
	var tz string

	// log configuration
	flag.IntVar(&config.LogLevel,
		"log",
		getEnvInt("LOG_LEVEL", 0),
		"(LOG_LEVEL) Set the log verbosity.",
	)
	// locality configuration
	flag.StringVar(&tz,
		"timezone",
		getEnvString("TIMEZONE", "America/Chicago"),
		"(TIMEZONE) Timezone for the sunrise/sunset calculation.",
	)
	// local webserver configuration
	flag.IntVar(&config.WebSrvPort,
		"http-port",
		getEnvInt("HTTP_PORT", 8080),
		"(HTTP_PORT) Listen port for internal webserver")
	flag.StringVar(&config.WebSrvIP,
		"http-ip",
		getEnvString("HTTP_IP", "0.0.0.0"),
		"(HTTP_IP) Listen ip for internal webserver")
	flag.IntVar(&config.WebSrvIdleTimeout,
		"http-idle-timeout",
		getEnvInt("HTTP_IDLE_TIMEOUT", 2),
		"(HTTP_IDLE_TIMEOUT) Idle timeout for internal webserver")
	flag.IntVar(&config.WebSrvReadTimeout,
		"http-read-timeout",
		getEnvInt("HTTP_READ_TIMEOUT", 5),
		"(HTTP_READ_TIMEOUT) Read timeout for internal webserver")
	flag.IntVar(&config.WebSrvWriteTimeout,
		"http-write-timeout",
		getEnvInt("HTTP_WRITE_TIMEOUT", 2),
		"(HTTP_WRITE_TIMEOUT) Write timeout for internal webserver")
	flag.Parse()

	setLogLevel(config.LogLevel)
	log.SetOutput(config.Log)

	// print current configuration
	log.Printf("[DEBUG] configuration value set: LOG_LEVEL          = %v\n", strconv.Itoa(config.LogLevel))
	log.Printf("[DEBUG] configuration value set: HTTP_PORT          = %v\n", strconv.Itoa(config.WebSrvPort))
	log.Printf("[DEBUG] configuration value set: HTTP_IP            = %v\n", config.WebSrvIP)
	log.Printf("[DEBUG] configuration value set: HTTP_IDLE_TIMEOUT  = %v\n", strconv.Itoa(config.WebSrvIdleTimeout))
	log.Printf("[DEBUG] configuration value set: HTTP_READ_TIMEOUT  = %v\n", strconv.Itoa(config.WebSrvReadTimeout))
	log.Printf("[DEBUG] configuration value set: HTTP_WRITE_TIMEOUT = %v\n", strconv.Itoa(config.WebSrvWriteTimeout))

	log.Printf("[DEBUG] Initialization complete.")
}