//
// O2CloudFileManager.swift
// O2Platform
//
// Created by FancyLou on 2019年10月30日.
// Copyright © 2019 zoneland. All rights reserved.
//

import UIKit
import Moya
import O2OA_Auth_SDK
import Promises
import CocoaLumberjack

class O2CloudFileManager {
 static let shared: O2CloudFileManager = {
 return O2CloudFileManager()
 }()
 
 private init() {
 
 }
 
 private let cloudFileApi = {
 return OOMoyaProvider<OOCloudStorageAPI>()
 }()
 
 
 // MARK: - 工具服务 获取url 本地文件夹路径等等
 
 //本地文件存储路径
 func cloudFileLocalPath(file: OOAttachment) -> URL {
 let fileName = "\(file.name!).\(file.`extension`!)"
 if let id = file.id {
 return O2.cloudFileLocalFolder()
 .appendingPathComponent(id)
 .appendingPathComponent(fileName)
 }
 return O2.cloudFileLocalFolder()
 .appendingPathComponent(fileName)
 
 }
 
 //获取图片地址 根据传入的大小进行比例缩放
 func scaleImageUrl(id: String, width: Int = 200, height: Int = 200) -> String {
 let model = O2AuthSDK.shared.o2APIServer(context: .x_file_assemble_control)
 let baseURLString = "\(model?.httpProtocol ?? "http")://\(model?.host ?? ""):\(model?.port ?? 0)\(model?.context ?? "")"
 return baseURLString + "/jaxrs/attachment2/\(id)/download/image/width/\(width)/height/\(height)"
 }
 
 //获取源文件下载地址
 func originFileUrl(id: String) -> String {
 let model = O2AuthSDK.shared.o2APIServer(context: .x_file_assemble_control)
 let baseURLString = "\(model?.httpProtocol ?? "http")://\(model?.host ?? ""):\(model?.port ?? 0)\(model?.context ?? "")"
 return baseURLString + "/jaxrs/attachment2/\(id)/download"
 }
 
 
 
 // MARK: - 文件获取相关操作
 
 func getFileUrl(fileId: String) -> Promise<URL> {
 return Promise { fulfill, reject in
 self.getFileURLFromDB(id: fileId).then({ (path) in
 fulfill(path)
 }).catch({ (error) in
 DDLogInfo("本地没有这个文件,去服务器获取一次")
 DDLogError(error.localizedDescription)
 self.getFileURLFromDownload(fileId: fileId).then({ (path) in
 fulfill(path)
 }).catch({ (err) in
 reject(err)
 })
 })
 }
 }
 
 //获取图片 先从本地文件查找 没找到再从网络下载
 func getImage(imageId: String) -> Promise<UIImage> {
 return Promise {fulfill, reject in
 self.getFileURLFromDB(id: imageId).then({ (path) in
 if let image = UIImage(contentsOfFile: path.path) {
 fulfill(image)
 }else {
 DDLogError("没有找到本地文件。。。。\(path.path)")
 reject(O2DBError.EmptyResultError)
 }
 }).catch({ error in
 DDLogError(error.localizedDescription)
 self.getFileURLFromDownload(fileId: imageId).then({ (path) in
 if let image = UIImage(contentsOfFile: path.path) {
 fulfill(image)
 }else {
 DDLogError("没有找到本地文件。。。。\(path.path)")
 reject(O2DBError.EmptyResultError)
 }
 }).catch({ (err) in
 reject(err)
 })
 })
 }
 }
 
 // MARK: - private method
 
 //下载文件 存储本地数据 返回本地文件路径
 private func getFileURLFromDownload(fileId: String) -> Promise<URL> {
 return Promise {fulfill, reject in
 //本地没有 去网络下载
 self.downdloadFile(id: fileId).then({ (file) -> Promise<O2CloudFileInfo> in
 return self.storageFile2DB(file: file)
 }).then({ (dbFile) in
 if let filePath = dbFile.filePath, !filePath.isBlank {
 DDLogDebug("查询到数据 文件路径:\(filePath)")
 let url = O2.cloudFileLocalFolder().appendingPathComponent(filePath)
 fulfill(url)
 }else {
 reject(O2DBError.EmptyResultError)
 }
 }).catch({error in
 reject(error)
 })
 }
 }
 
 
 //从数据库获取 本地文件路径
 private func getFileURLFromDB(id: String) -> Promise<URL> {
 return Promise { fulfill, reject in
 DBManager.shared.queryCloudFile(fileId: id).then({ (dbFile) in
 if let filePath = dbFile.filePath, !filePath.isBlank {
 DDLogDebug("查询到数据 文件路径:\(filePath)")
 let url = O2.cloudFileLocalFolder().appendingPathComponent(filePath)
 fulfill(url)
 }else {
 reject(O2DBError.EmptyResultError)
 }
 }).catch({ (error) in
 reject(error)
 })
 }
 }
 
 //存储附件对象到数据库
 private func storageFile2DB(file: OOAttachment) -> Promise<O2CloudFileInfo> {
 return Promise { fulfill, reject in
 let info = O2CloudFileInfo()
 info.fileId = file.id!
 info.fileName = file.name!
 let fileName = "\(file.name!).\(file.`extension`!)"
 let path = "\(file.id!)/\(fileName)"
 DDLogDebug("保存数据库 path:\(path)")
 info.filePath = path
 info.fileExt = file.extension ?? ""
 DBManager.shared.insertCloudFile(info: info).then({ (result) in
 if result {
 fulfill(info)
 }else {
 reject(O2DBError.UnkownError)
 }
 }).catch({ (error) in
 DDLogError(error.localizedDescription)
 reject(error)
 })
 }
 }
 
 
 
 //网络下载附件
 private func downdloadFile(id: String) -> Promise<OOAttachment>{
 return Promise { fulfill, reject in
 self.cloudFileApi.request(.getFile(id)) { (result) in
 let response = OOResult<BaseModelClass<OOAttachment>>(result)
 if response.isResultSuccess() {
 if let file = response.model?.data {
 self.cloudFileApi.request(.downloadFile(file), completion: { (downloadResult) in
 switch downloadResult {
 case .success(_):
 //下载文件成功 返回附件对象 需要附件的地方根据固定的文件位置去查找
 fulfill(file)
 break
 case .failure(let err):
 reject(err)
 break
 }
 })
 }else {
 reject(O2APIError.o2ResponseError("没有查询到附件对象, id: \(id)"))
 }
 }else {
 reject(response.error!)
 }
 }
 }
 }
 
 
 
 
 
}