package storage

import (
	"context"
	"go/weather/pkg/logger"
	"io"
	"io/fs"
	"os"

	"go.uber.org/zap"
)

//s3Storage classe used to store oi.Reader to s3
type fileStorage struct {
	logger   *logger.WeatherLogger
	filename string
}

//NewFileStorage instanciate storage object
func NewFileStorage(log *logger.WeatherLogger, filename string) Storage {
	s3 := fileStorage{
		logger:   log,
		filename: filename,
	}
	return &s3
}

//Store send data to s3 bucket
func (ss *fileStorage) Store(ctx context.Context, content io.Reader) {
	b, err := io.ReadAll(content)
	ss.handleError(err)

	err = AppendFile(ss.filename, append(b, "\n"...), fs.ModeAppend)
	ss.handleError(err)
}

//AppendFile add line to an existing file
func AppendFile(filename string, data []byte, perm fs.FileMode) error {
	f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, perm)
	if err != nil {
		return err
	}
	_, err = f.Write(data)
	if err1 := f.Close(); err1 != nil && err == nil {
		err = err1
	}
	return err
}

//handleError generic fatal error
func (ss *fileStorage) handleError(err error) {
	if err != nil {
		ss.logger.Fatal("Storage error", zap.Error(err))
	}
}