package qiniu

import (
	"context"
	"fmt"
	"git.bvbej.com/bvbej/base-golang/pkg/md5"
	"github.com/qiniu/go-sdk/v7/auth/qbox"
	"github.com/qiniu/go-sdk/v7/storage"
	"net/http"
	"net/url"
	"path"
	"strings"
	"time"
)

var _ QiNiu = (*qiNiu)(nil)

type QiNiu interface {
	i()
	SetDefaultUploadTokenTTL(ttl uint64)
	GetCallbackUploadToken(ttl uint64, callbackURL string) string
	GetUploadToken(ttl uint64) string
	GetPrivateURL(key string, ttl uint64) string
	VerifyCallback(req *http.Request) (bool, error)
	UploadFile(key, localFile string) (*PutRet, error)
	ResumeUploadFile(key, localFile string) (*PutRet, error)
	DelFile(key string) error
	TimestampSecuritySign(path string, ttl time.Duration) string
	GetFileInfo(key string) *storage.FileInfo
	ListFiles(prefix, delimiter, marker string, limit int) (entries []storage.ListItem, commonPrefixes []string, nextMarker string, hasNext bool, err error)
}

type qiNiu struct {
	mac            *qbox.Mac
	conf           *storage.Config
	bucket         string
	domain         string
	securityKey    string
	md5            md5.MD5
	uploadTokenTTL uint64
}

type PutRet struct {
	Key    string `json:"key"`
	Hash   string `json:"hash"`
	Fsize  string `json:"fsize"`
	Fname  string `json:"fname"`
	Ext    string `json:"ext"`
	Unique string `json:"unique"`
	User   string `json:"user"`
}

func New(accessKey, secretKey, bucket, domain, securityKey string) QiNiu {
	region, _ := storage.GetRegion(accessKey, bucket)
	return &qiNiu{
		mac:         qbox.NewMac(accessKey, secretKey),
		bucket:      bucket,
		domain:      domain,
		securityKey: securityKey,
		conf: &storage.Config{
			Region:        region, //空间所在的存储区域
			UseHTTPS:      true,   //是否使用https域名
			UseCdnDomains: true,   //上传是否使用CDN上传加速
		},
		md5:            md5.New(),
		uploadTokenTTL: 3600,
	}
}

func (q *qiNiu) i() {}

func (q *qiNiu) SetDefaultUploadTokenTTL(ttl uint64) {
	q.uploadTokenTTL = ttl
}

func (q *qiNiu) GetUploadToken(ttl uint64) string {
	putPolicy := storage.PutPolicy{
		Scope:   q.bucket,
		Expires: ttl,
	}
	return putPolicy.UploadToken(q.mac)
}

func (q *qiNiu) GetCallbackUploadToken(ttl uint64, callbackURL string) string {
	putPolicy := storage.PutPolicy{
		Scope:            q.bucket,
		CallbackURL:      callbackURL,
		CallbackBody:     `{"key":"$(key)","hash":"$(etag)","fname":"$(fname)","fsize":"$(fsize)","ext":"$(ext)","unique":"$(x:unique)","user":"$(x:user)"}`,
		CallbackBodyType: "application/json",
		Expires:          ttl,
	}
	return putPolicy.UploadToken(q.mac)
}

func (q *qiNiu) GetPrivateURL(key string, ttl uint64) string {
	deadline := time.Now().Add(time.Second * time.Duration(ttl)).Unix()
	return storage.MakePrivateURL(q.mac, q.domain, key, deadline)
}

func (q *qiNiu) VerifyCallback(req *http.Request) (bool, error) {
	return q.mac.VerifyCallback(req)
}

func (q *qiNiu) UploadFile(key, localFile string) (*PutRet, error) {
	upToken := q.GetUploadToken(q.uploadTokenTTL)

	//构建表单上传的对象
	formUploader := storage.NewFormUploader(q.conf)

	//请求参数
	filename := path.Base(key)
	fileSuffix := path.Ext(key)
	filePrefix := filename[0 : len(filename)-len(fileSuffix)]
	putExtra := &storage.PutExtra{
		Params: map[string]string{
			"x:unique": filePrefix,
			"x:user":   "-",
		},
	}

	//自定义返回body
	ret := new(PutRet)

	err := formUploader.PutFile(context.Background(), ret, upToken, key, localFile, putExtra)
	if err != nil {
		return nil, err
	}

	return ret, nil
}

func (q *qiNiu) ResumeUploadFile(key, localFile string) (*PutRet, error) {
	upToken := q.GetUploadToken(q.uploadTokenTTL)

	//构建分片上传的对象
	resumeUploader := storage.NewResumeUploaderV2(q.conf)

	//请求参数
	filename := path.Base(key)
	fileSuffix := path.Ext(key)
	filePrefix := filename[0 : len(filename)-len(fileSuffix)]
	putExtra := &storage.RputV2Extra{
		CustomVars: map[string]string{
			"x:unique": filePrefix,
			"x:user":   "-",
		},
	}

	//自定义返回body
	ret := new(PutRet)

	err := resumeUploader.PutFile(context.Background(), ret, upToken, key, localFile, putExtra)
	if err != nil {
		return nil, err
	}

	return ret, nil
}

func (q *qiNiu) DelFile(key string) error {
	bucketManager := storage.NewBucketManager(q.mac, q.conf)

	err := bucketManager.Delete(q.bucket, key)
	if err != nil {
		return err
	}

	return nil
}

func (q *qiNiu) TimestampSecuritySign(path string, ttl time.Duration) string {
	sep := "/"
	path = strings.Trim(path, sep)
	splits := strings.Split(path, sep)
	for i, split := range splits {
		splits[i] = url.QueryEscape(split)
	}
	path = sep + strings.Join(splits, sep)

	unix := time.Now().Add(ttl).Unix()
	hex := fmt.Sprintf("%x", unix)

	encrypt := q.md5.Encrypt(q.securityKey + path + hex)

	param := make(url.Values)
	param.Set("sign", encrypt)
	param.Set("t", hex)

	return param.Encode()
}

func (q *qiNiu) GetFileInfo(key string) *storage.FileInfo {
	bucketManager := storage.NewBucketManager(q.mac, q.conf)

	fileInfo, sErr := bucketManager.Stat(q.bucket, key)
	if sErr != nil {
		return nil
	}

	return &fileInfo
}

func (q *qiNiu) ListFiles(prefix, delimiter, marker string, limit int) (entries []storage.ListItem,
	commonPrefixes []string, nextMarker string, hasNext bool, err error) {
	bucketManager := storage.NewBucketManager(q.mac, q.conf)

	return bucketManager.ListFiles(q.bucket, prefix, delimiter, marker, limit)
}