package gostorage

import (
	"errors"
	"github.com/aliyun/aliyun-oss-go-sdk/oss"
	"io"
	"sync"
)

// AliYunConfig 阿里云配置
type AliYunConfig struct {
	AccessKeyId        string // 账号信息
	AccessKeySecret    string // 账号信息
	Endpoint           string // 地域节点 外网访问 test3
	EndpointEcs        string // 地域节点 ECS 的经典网络访问（内网） test1
	EndpointAccelerate string // 地域节点 传输加速域名（全地域上传下载加速 test4
	BucketName         string // 存储空间名称
}

// AliYun 阿里云
type AliYun struct {
	AliYunConfig
	error                   error       // 错误信息
	client                  *oss.Client // 驱动
	bucket                  *oss.Bucket // 存储空间
	endpointError           error       // 错误信息
	endpointEcsError        error       // 错误信息
	endpointAccelerateError error       // 错误信息
}

// NewAliYun 初始化
// https://help.aliyun.com/document_detail/32144.html
func NewAliYun(config *AliYunConfig) (*AliYun, error) {
	app := &AliYun{}
	app.AccessKeyId = config.AccessKeyId
	app.AccessKeySecret = config.AccessKeySecret
	app.Endpoint = config.Endpoint
	app.EndpointEcs = config.EndpointEcs
	app.EndpointAccelerate = config.EndpointAccelerate
	app.BucketName = config.BucketName

	wg := sync.WaitGroup{}
	wg.Add(3)
	go app.configEndpointEcs(&wg)
	go app.configEndpoint(&wg)
	go app.configEndpointAccelerate(&wg)
	wg.Wait()

	// 判断结果
	if app.endpointEcsError == nil {
		return app, nil
	}
	if app.endpointError == nil {
		return app, nil
	}
	if app.endpointAccelerateError == nil {
		return app, nil
	}

	return app, errors.New("链接失败")
}

func (c *AliYun) configEndpoint(wg *sync.WaitGroup) {
	defer wg.Done()

	if c.Endpoint == "" {
		c.endpointError = errors.New("没有配置")
		return
	}

	// 创建链接
	c.client, c.endpointError = oss.New(c.Endpoint, c.AccessKeyId, c.AccessKeySecret)
	if c.endpointError != nil {
		return
	}

	// 填写存储空间名称
	c.bucket, c.endpointError = c.client.Bucket(c.BucketName)
	if c.endpointError != nil {
		return
	}

	// 判断存储空间是否存在
	_, c.endpointError = c.client.IsBucketExist(c.BucketName)
	if c.endpointError != nil {
		return
	}

	c.endpointError = nil
	return
}

func (c *AliYun) configEndpointEcs(wg *sync.WaitGroup) {
	defer wg.Done()

	if c.EndpointEcs == "" {
		c.endpointEcsError = errors.New("没有配置")
		return
	}

	// 创建链接
	c.client, c.endpointEcsError = oss.New(c.EndpointEcs, c.AccessKeyId, c.AccessKeySecret)
	if c.endpointEcsError != nil {
		return
	}

	// 填写存储空间名称
	c.bucket, c.endpointEcsError = c.client.Bucket(c.BucketName)
	if c.endpointEcsError != nil {
		return
	}

	// 判断存储空间是否存在
	_, c.endpointEcsError = c.client.IsBucketExist(c.BucketName)
	if c.endpointEcsError != nil {
		return
	}

	c.endpointEcsError = nil

	return
}

func (c *AliYun) configEndpointAccelerate(wg *sync.WaitGroup) {
	defer wg.Done()

	if c.EndpointAccelerate == "" {
		c.endpointAccelerateError = errors.New("没有配置")
		return
	}

	// 创建链接
	c.client, c.endpointAccelerateError = oss.New(c.EndpointAccelerate, c.AccessKeyId, c.AccessKeySecret)
	if c.endpointAccelerateError != nil {
		return
	}

	// 填写存储空间名称
	c.bucket, c.endpointAccelerateError = c.client.Bucket(c.BucketName)
	if c.endpointAccelerateError != nil {
		return
	}

	// 判断存储空间是否存在
	_, c.endpointAccelerateError = c.client.IsBucketExist(c.BucketName)
	if c.endpointAccelerateError != nil {
		return
	}

	c.endpointAccelerateError = nil

	return
}

// Bucket 存储空间
func (c *AliYun) Bucket(name string) *AliYun {
	c.bucket, c.error = c.client.Bucket(name)
	return c
}

// PutObject 上传文件流
// @param file 文件流
// @param filePath 文件路径
// @param fileName 文件名称
func (c *AliYun) PutObject(file io.Reader, filePath, fileName string) (resp FileInfo, err error) {
	objectKey := filePath
	if fileName != "" {
		objectKey = filePath + "/" + fileName
	}
	err = c.bucket.PutObject(objectKey, file)
	resp.Path = filePath
	resp.Name = fileName
	resp.Url = objectKey
	return
}