package conf

import (
	"fmt"
	"github.com/pelletier/go-toml"
	"net"
	"os"
	"time"
)

type conf struct {
	BindHost string `toml:"bind_host"`
	BindPort int    `toml:"bind_port"`

	SMTPHost     string `toml:"smtp_host"`
	SMTPPort     int    `toml:"smtp_port"`
	SMTPUsername string `toml:"smtp_username"`
	SMTPPassword string `toml:"smtp_password"`
	SMTPReceiver string `toml:"smtp_receiver"`

	CaptchaDirectory  string        `toml:"captcha_directory"`
	CaptchaLength     int           `toml:"captcha_length"`
	CaptchaWidth      int           `toml:"captcha_width"`
	CaptchaHeight     int           `toml:"captcha_height"`
	CaptchaExpiration time.Duration `toml:"captcha_expiration"`
}

var Conf = conf{
	BindHost:          "127.0.0.1",
	BindPort:          8000,
	CaptchaLength:     6,
	CaptchaWidth:      240,
	CaptchaHeight:     80,
	CaptchaExpiration: time.Hour,
}

func ParseFile(path string) bool {
	var failure bool

	// Open config file
	file, err := os.Open(path)
	if err != nil {
		fmt.Fprintf(os.Stderr, "ERROR: cannot open config file %q: %s\n", path, err.Error())
		return false
	}

	// Read data from config file
	var data = make([]byte, 10000)
	n, err := file.Read(data)
	if err != nil {
		fmt.Fprintf(os.Stderr, "ERROR: cannot read config file %q: %s\n", path, err.Error())
		return false
	}

	// Parse toml from config file
	if err = toml.Unmarshal(data[:n], &Conf); err != nil {
		fmt.Fprintf(os.Stderr, "ERROR: cannot load toml config from file %q: %s\n", path, err.Error())
		return false
	}

	// Check arguments in config file
	if net.ParseIP(Conf.BindHost) == nil {
		fmt.Fprintf(os.Stderr, "ERROR: bad value for 'bind_host' in config file %q: should be a valid IP address\n", path)
		failure = true
	}
	if Conf.BindPort < 1 || Conf.BindPort > 65535 {
		fmt.Fprintf(os.Stderr, "ERROR: bad value for 'bind_port' in config file %q: should be an integer in 1-65535\n", path)
		failure = true
	}
	if Conf.SMTPHost == "" {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'smtp_host' in config file %q\n", path)
		failure = true
	}
	if Conf.SMTPPort < 1 || Conf.SMTPPort > 65535 {
		fmt.Fprintf(os.Stderr, "ERROR: bad value for 'smtp_port' in config file %q: should be an integer in 1-65535\n", path)
		failure = true
	}
	if Conf.SMTPUsername == "" {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'smtp_username' in config file %q\n", path)
		failure = true
	}
	if Conf.SMTPPassword == "" {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'smtp_password' in config file %q\n", path)
		failure = true
	}
	if Conf.SMTPReceiver == "" {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'smtp_receiver' in config file %q\n", path)
		failure = true
	}
	if Conf.CaptchaDirectory == "" {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'captcha_directory' in config file %q\n", path)
		failure = true
	}
	if Conf.CaptchaLength == 0 {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'captcha_length' in config file %q\n", path)
		failure = true
	}
	if Conf.CaptchaWidth == 0 {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'captcha_width' in config file %q\n", path)
		failure = true
	}
	if Conf.CaptchaHeight == 0 {
		fmt.Fprintf(os.Stderr, "ERROR: missing value for 'captcha_height' in config file %q\n", path)
		failure = true
	}

	return !failure
}