package logfile

import (
	"encoding/xml"
	"fmt"
	"io/ioutil"
	"log"
	"os"

	"github.com/go-flucky/flucky/pkg/types"
)

type xmlLogfile struct {
	logfile string
}

func (xl *xmlLogfile) GetLogfile() string {
	return xl.logfile
}

func (xl *xmlLogfile) ReadHumidities() ([]*types.Humidity, error) {
	if _, err := os.Stat(xl.logfile); os.IsNotExist(err) {
		return nil, fmt.Errorf("%v: %v", errorLogfileNotFound, xl.logfile)
	}

	humidities := make([]*types.Humidity, 0)

	f, err := os.Open(xl.logfile)
	if err != nil {
		return nil, fmt.Errorf("%v: %v", errorLogfileOpen, xl.logfile)
	}
	defer f.Close()

	xmlDecoder := xml.NewDecoder(f)
	err = xmlDecoder.Decode(&humidities)
	if err != nil {
		return nil, fmt.Errorf("%v: %v", errorLogfileDecode, err)
	}

	return humidities, nil
}

func (xl *xmlLogfile) ReadTemperatures() ([]*types.Temperature, error) {
	if _, err := os.Stat(xl.logfile); os.IsNotExist(err) {
		return nil, fmt.Errorf("%v: %v", errorLogfileNotFound, xl.logfile)
	}

	f, err := os.Open(xl.logfile)
	if err != nil {
		return nil, fmt.Errorf("%v: %v", errorLogfileOpen, xl.logfile)
	}
	defer f.Close()

	bytes, err := ioutil.ReadAll(f)
	if err != nil {
		return nil, fmt.Errorf("%v: %v", errorLogfileRead, err)
	}

	tmpTemperatures := new(Temperatures)

	err = xml.Unmarshal(bytes, tmpTemperatures)
	if err != nil {
		return nil, fmt.Errorf("%v: %v", errorLogfileUnmarshal, err)
	}

	log.Println(len(tmpTemperatures.Temperatures))

	temperatures := make([]*types.Temperature, 0)

	for _, tmpTemperature := range tmpTemperatures.Temperatures {
		temperatures = append(temperatures, tmpTemperature.Temperature)
	}

	return temperatures, nil
}

func (xl *xmlLogfile) WriteHumidities(humidities []*types.Humidity) error {

	f, err := os.Create(xl.logfile)
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileCreate, xl.logfile)
	}
	defer f.Close()

	xmlEncoder := xml.NewEncoder(f)
	xmlEncoder.Indent("", "  ")
	err = xmlEncoder.Encode(humidities)
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileEncode, err)
	}
	return nil
}

func (xl *xmlLogfile) WriteTemperatures(temperatures []*types.Temperature) error {
	f, err := os.Create(xl.logfile)
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileCreate, xl.logfile)
	}
	defer f.Close()

	writeCreationDate(temperatures)

	tmpTemperatures := new(Temperatures)

	for _, temperature := range temperatures {
		tmpTemperature := &Temperature{
			Temperature: temperature,
		}

		tmpTemperatures.Temperatures = append(tmpTemperatures.Temperatures, tmpTemperature)
	}

	bytes, err := xml.MarshalIndent(tmpTemperatures, "", "  ")
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileMarshal, err)
	}

	_, err = f.Write(bytes)
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileWrite, err)
	}

	return nil
}