package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"

	"gopkg.in/yaml.v2"
)

var (
	CONFIG_PATH   = "/work/config/config.yaml"
	CONFIG_PREFIX = "/work/config/"
	//CONFIG_PATH   = "D:\\Config\\modbus\\config.yaml"
	//CONFIG_PREFIX = "D:\\Config\\modbus\\"
)

type ModBusConfigError int

var (
	FILE_PATH_NOEXIT = errors.New("文件地址不存在")

	// modpoll port
	MODPOLL_PORT uint64 = 502
	// modpoll ip
	MODPOLL_IP  string
	SERIAL_PORT string

	//log enabled
	LOGGER_ENABLED bool
)

func NewConfig() (*ModbusAppConfig, error) {
	yamlFile, err := ioutil.ReadFile(CONFIG_PATH)
	if err != nil {
		return nil, fmt.Errorf("[NewConfig]->ioutil.ReadFile error,%w", err)
	}

	var config = &ModbusAppConfig{}
	if err := yaml.Unmarshal(yamlFile, config); err != nil {
		return nil, fmt.Errorf("[NewConfig]->yaml.Unmarshal error,%w", err)
	}

	if config.Modpoll.Port > 0 {
		MODPOLL_PORT = config.Modpoll.Port
	}
	MODPOLL_IP = config.Modpoll.IP
	SERIAL_PORT = config.Modpoll.SerialPort
	LOGGER_ENABLED = config.Logger.Enabled
	return config, nil
}

func ParseConfig(model interface{}, fileName string) error {
	if len(fileName) == 0 {
		return FILE_PATH_NOEXIT
	}
	yamlFile, err := ioutil.ReadFile(CONFIG_PREFIX + fileName)
	if err != nil {
		return fmt.Errorf("[ParseConfig]->ioutil.ReadFile error,%w", err)
	}
	if err := json.Unmarshal(yamlFile, model); err != nil {
		return fmt.Errorf("[ParseConfig]->json.Unmarshal error,%w", err)
	}

	return nil
}