package file

import (
	"io"
	"os"
	"path/filepath"
	"time"

	rotatelogs "github.com/lestrrat/go-file-rotatelogs"
)

// 参考 https://github.com/nacos-group/nacos-sdk-go/blob/v1.0.4/common/logger/logger.go#L130
type RotateWriterConfig struct {
	Pattern        string        `json:"pattern"`
	FileName       string        `json:"file_path"`
	MaxAge         time.Duration `json:"max_age"`
	RotateDuration time.Duration `json:"rotate_time"`
}

func NewDefaultRotateWriter(fileName string) RotateWriterConfig {
	return RotateWriterConfig{
		FileName:       fileName,
		MaxAge:         time.Hour * 24 * 30,
		RotateDuration: time.Hour * 24,
		Pattern:        "%Y%m%d%H%M",
	}
}

func (config RotateWriterConfig) NewWriter() (io.Writer, error) {
	fileSimpleName := filepath.Base(config.FileName)
	outputPath := filepath.Dir(config.FileName) + string(os.PathSeparator)
	return rotatelogs.New(filepath.Join(outputPath, fileSimpleName+"-"+config.Pattern),
		rotatelogs.WithRotationTime(config.RotateDuration), rotatelogs.WithMaxAge(config.MaxAge),
		rotatelogs.WithLinkName(filepath.Join(outputPath, fileSimpleName)))
}