package config

import (
	"encoding/json"
	"fmt"
	"mime/multipart"
	"time"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/credentials"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/s3/s3manager"
	"github.com/pkg/errors"
)

// File 文件存储配置
type File struct {
	OssType    string                 `mapstructure:"oss-type" json:"oss-type" yaml:"oss-type"`
	Path       string                 `mapstructure:"path" json:"path" yaml:"path"`
	ProxyPath  string                 `mapstructure:"proxy-path" json:"proxy-path" yaml:"proxy-path"`
	StorePath  string                 `mapstructure:"store-path" json:"store-path" yaml:"store-path"`
	OriginConf map[string]interface{} `mapstructure:"origin-conf" json:"origin-conf" yaml:"origin-conf"`
}

// AwsS3 AWS S3配置（兼容MinIO）
type AwsS3 struct {
	Bucket           string `mapstructure:"bucket" json:"bucket" yaml:"bucket"`
	Region           string `mapstructure:"region" json:"region" yaml:"region"`
	Endpoint         string `mapstructure:"endpoint" json:"endpoint" yaml:"endpoint"`
	SecretID         string `mapstructure:"secret-id" json:"secret-id" yaml:"secret-id"`
	SecretKey        string `mapstructure:"secret-key" json:"secret-key" yaml:"secret-key"`
	BaseURL          string `mapstructure:"base-url" json:"base-url" yaml:"base-url"`
	PathPrefix       string `mapstructure:"path-prefix" json:"path-prefix" yaml:"path-prefix"`
	S3ForcePathStyle bool   `mapstructure:"s3-force-path-style" json:"s3-force-path-style" yaml:"s3-force-path-style"`
	DisableSSL       bool   `mapstructure:"disable-ssl" json:"disable-ssl" yaml:"disable-ssl"`
}

// newSession 创建S3 session
func (a *AwsS3) newSession() *session.Session {
	sess, _ := session.NewSession(&aws.Config{
		Region:           aws.String(a.Region),
		Endpoint:         aws.String(a.Endpoint),
		S3ForcePathStyle: aws.Bool(a.S3ForcePathStyle),
		DisableSSL:       aws.Bool(a.DisableSSL),
		Credentials: credentials.NewStaticCredentials(
			a.SecretID,
			a.SecretKey,
			"",
		),
	})
	return sess
}

// UploadFile 上传文件
func (a *AwsS3) UploadFile(file *multipart.FileHeader) (string, string, error) {
	_session := a.newSession()
	uploader := s3manager.NewUploader(_session)

	// 生成文件名
	fileKey := fmt.Sprintf("%d%s", time.Now().Unix(), file.Filename)
	filename := a.PathPrefix + "/" + fileKey

	f, openError := file.Open()
	if openError != nil {
		return "", "", errors.New("function file.Open() failed, err:" + openError.Error())
	}
	defer f.Close()

	_, err := uploader.Upload(&s3manager.UploadInput{
		Bucket: aws.String(a.Bucket),
		Key:    aws.String(filename),
		Body:   f,
	})
	if err != nil {
		return "", "", err
	}

	return a.BaseURL + "/" + filename, fileKey, nil
}

// UploadFileToStorage 上传文件到存储
func UploadFileToStorage(file *multipart.FileHeader) (string, error) {
	conf := EnvConf().File
	if conf == nil {
		return "", fmt.Errorf("file config not found")
	}

	if conf.OssType != "aws" {
		return "", fmt.Errorf("only aws/minio storage type is supported")
	}

	// 解析 OriginConf 到 AwsS3 结构
	engine := new(AwsS3)
	byteData, err := json.Marshal(conf.OriginConf)
	if err != nil {
		return "", err
	}
	err = json.Unmarshal(byteData, engine)
	if err != nil {
		return "", err
	}

	viewPath, _, err := engine.UploadFile(file)
	if err != nil {
		return "", err
	}

	return viewPath, nil
}