package logs

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"

	stypes "git.cryptic.systems/fh-trier/go-flucky-server/pkg/types"
	"git.cryptic.systems/fh-trier/go-flucky/pkg/types"
)

// AppendTemperature write a given array of temperatures to a logfile
func AppendTemperature(temperatures []*stypes.Temperature, cnf *types.Config) error {

	tLog, err := ReadTemperatures(cnf.TemperatureLogfile)
	if err != nil {
		return err
	}

	tLog = append(tLog, temperatures...)

	err = WriteTemperatures(tLog, cnf.TemperatureLogfile)
	if err != nil {
		return err
	}

	return nil
}

// FlushTemperatures ...
func FlushTemperatures(logFile string) error {
	if err := ioutil.WriteFile(logFile, []byte(""), 0644); err != nil {
		return err
	}
	return nil
}

// ReadTemperatures ...
func ReadTemperatures(logFile string) ([]*stypes.Temperature, error) {

	logPath := filepath.Dir(logFile)

	// create log dir if not exist
	if _, err := os.Stat(logFile); os.IsNotExist(err) {
		if _, err := os.Stat(logPath); os.IsNotExist(err) {
			err := os.MkdirAll(logPath, os.ModePerm)
			if err != nil {
				return nil, fmt.Errorf("Can not create directory: %v", err)
			}
		}
		if err := FlushTemperatures(logFile); err != nil {
			return nil, err
		}

	}

	// open config file
	jsonFile, err := os.Open(logFile)
	if err != nil {
		return nil, fmt.Errorf("Can not open file %v: %v", logFile, err)
	}
	defer jsonFile.Close()

	bytes, err := ioutil.ReadAll(jsonFile)
	if err != nil {
		return nil, fmt.Errorf("Can not read jsonfile %v: %v", logFile, err)
	}

	temperatures := []*stypes.Temperature{}
	json.Unmarshal(bytes, &temperatures)

	return temperatures, nil
}

// WriteTemperatures ...
func WriteTemperatures(temperatures []*stypes.Temperature, logFile string) error {

	bytes, err := json.Marshal(temperatures)
	if err != nil {
		return err
	}

	if err := ioutil.WriteFile(logFile, bytes, 0644); err != nil {
		return err
	}

	return nil
}