package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"time"
)

var (
	clogger *log.Logger
)

func init() {
	clogger = log.New(os.Stdout, "[ Main ]", log.LstdFlags)
}

type Config struct {
	Limit    int     `json:limit`
	Interval string  `json:interval`
	Epsilon  float64 `json:epsilon`

	Verbose bool `json:verbose`

	DataSource string `json:dataSource`

	DBConn     string `json:DBConn`
	DBName     string `json:DBName`
	RawTable   string `json:rawTable`
	CleanTable string `json:cleanTable`
	DBUser     string `json:DBUser`
	DBPass     string `json:DBPass`
}

func (cfg *Config) getInterval() (interval time.Duration, err error) {
	switch cfg.Interval {
	case "5min":
		interval = time.Minute * 5
	case "10min":
		interval = time.Minute * 10
	case "30min":
		interval = time.Minute * 30
	case "hour":
		interval = time.Hour
	case "day":
		interval = time.Hour * 24
	default:
		err = errors.New(fmt.Sprintf("Invalid interval: %s", cfg.Interval))
	}
	return
}

func readConfig() (cfg *Config, err error) {
	clogger.Println("Reading config...")
	content, err := ioutil.ReadFile("config.json")
	if err != nil {
		log.Println(err)
	}
	err = json.Unmarshal(content, &cfg)
	if err != nil {
		log.Println(err)
	}
	clogger.Println("Done!")
	return
}