package logfile

import (
	"encoding/json"
	"fmt"
	"os"

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

type jsonLogfile struct {
	logfile string
}

func (jl *jsonLogfile) GetLogfile() string {
	return jl.logfile
}

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

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

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

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

	return humidities, nil
}

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

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

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

	jsonDecoder := json.NewDecoder(f)
	err = jsonDecoder.Decode(&temperatures)
	if err != nil {
		return nil, fmt.Errorf("%v: %v", errorLogfileDecode, err)
	}

	return temperatures, nil
}

func (jl *jsonLogfile) WriteHumidities(humidities []*types.Humidity) error {

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

	jsonEncoder := json.NewEncoder(f)
	jsonEncoder.SetIndent("", "  ")
	err = jsonEncoder.Encode(humidities)
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileEncode, err)
	}
	return nil
}

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

	writeCreationDate(temperatures)

	jsonEncoder := json.NewEncoder(f)
	jsonEncoder.SetIndent("", "  ")
	err = jsonEncoder.Encode(temperatures)
	if err != nil {
		return fmt.Errorf("%v: %v", errorLogfileEncode, err)
	}
	return nil
}