//
//  ProfileViewModel.swift
//  IOS_study
//
//  Created by CC-star on 2025/7/15.
//

import PhotosUI
import SwiftUI

@Observable final class ProfileViewModel {
   var viewDidLoad = false
   //user
   var user = DBUser()
   var userID: String { user.id }
   var draftUser = DBUser()
   var isFcUser = false
   var isCompanyImagesLoaded = false
   var isPostingCompany = false
   //发布的工作
   var plJobs: [PLJob] = []
   var aPLJobsCount = 0
   var pLJobsCount = 0
   var isFcPLJobs = false
   var shouldRefreshMyPLJobs = false
   //分页用
   var currentPLPage = 0
   var isPLFinshed = false
   
   //总的
   var isFcSome: Bool { isFcUser || isFcPLJobs }
   
   
   @MainActor func getUsersData() async throws {
      try await getUser()
      async let getPLJobs: () = getPLJobs(isRefresh: true)
      async let getPLJobsCount: () = getPLJobsCount()
      
      
      let _ =  await (getPLJobs, getPLJobsCount)
   }
   
   @MainActor func refreshIFNeed() async throws {
      if shouldRefreshMyPLJobs {
         async let getPLJobs: () = getPLJobs(isRefresh: true)
         async let getPLJobsCount: () = getPLJobsCount()
         let _ = await (getPLJobs, getPLJobsCount)
         shouldRefreshMyPLJobs = false
      }
   }
   
   var logoUIImage: UIImage?//可选类型，？ -> 默认nil
   var logoImageErrorMsg = ""
   var logoItem: PhotosPickerItem? {
      didSet {
         //guard let logoItem  ->  guard let logoItem = logoItem
         guard let logoItem else { return }
         Task {
            //把用户选择的item转换成。。。
            if let data = try? await logoItem.loadTransferable(type: Data.self), let uiImage = UIImage(data: data) {
               logoImageErrorMsg = ""
               logoUIImage = uiImage
            } else {
               print("PhotosPickerItem转换成图片失败")
               logoImageErrorMsg = "上传图片失败，请重新上传"
            }
            self.logoItem = nil
         }
      }
   }
   var isLoadingCompanyImages = false
   var companyUIImages: [UIImage] = []
   var companyUIImagesErrorMsg = ""
   var companyItems: [PhotosPickerItem] = [] {
      didSet {
         if companyItems.isEmpty { return }
         Task { @MainActor in
            isLoadingCompanyImages = true
            defer {
               isLoadingCompanyImages = false
            }
            var newImages: [UIImage] = []
            for item in companyItems {
               if let data = try? await item.loadTransferable(type: Data.self), let uiImage = UIImage(data: data) {
                  newImages.append(uiImage)
               }
            }
            companyUIImages.append(contentsOf: newImages)
            if newImages.count == companyItems.count {
               companyUIImagesErrorMsg = ""
            } else {
               companyUIImagesErrorMsg = "有图片上传失败，请重新上传"
            }
            companyItems.removeAll()
         }
      }
   }
   @MainActor func loadCompanyLogoAndIamges() async {
      isCompanyImagesLoaded = false
      if !user.cLogoURLStr.isEmpty {
         if let url = URL(string: user.cLogoURLStr),
            let (data, _) = try? await URLSession.shared.data(from: url),
            let uiImage = UIImage(data: data) {
            logoUIImage = uiImage
         }
      }
      if !user.cImageURLStrs.isEmpty {
         var newImages: [UIImage] = []
         for cImageURLStr in user.cImageURLStrs {
            if let url = URL(string: cImageURLStr),
               let (data, _) = try? await URLSession.shared.data(from: url),
               let uiImage = UIImage(data: data) {
               newImages.append(uiImage)
            }
         }
         companyUIImages = newImages
      }
      isCompanyImagesLoaded = true
   }
   
   @MainActor func postCompany() async throws {
      user = draftUser
      //处理空格(必填部分)
      user.cName = user.cName.trimmed
      user.cCity = user.cCity.trimmed
      //处理空格（选填部分）
      if user.cAboutUS.isBlank {
         user.cAboutUS = ""
      } else {
         user.cAboutUS = user.cAboutUS.trimmed
      }
      //并行上传图片，两种方法：async let 和 withThrowingTaskGroup
      async let logoURLStr: String? = {//闭包
         guard let logoUIImage else { return nil }
         return try await StorageManager.shared.saveImage(logoUIImage)
      }()
      if !companyUIImages.isEmpty {
         let companyImageResults = try await withThrowingTaskGroup(of:((Int, String).self)) { group in
            for (index, uiImage) in companyUIImages.enumerated() {
               group.addTask {
                  let urlStr = try await StorageManager.shared.saveImage(uiImage)
                  return (index, urlStr)
               }
            }
            var results: [(Int, String)] = []
            for try await result in group {
               results.append(result)
            }
            return results
         }
         user.cImageURLStrs = companyImageResults.sorted(by: { $0.0 < $1.0 }).map { $0.1 }
      }
      if let clogoURLStr = try await logoURLStr {
         user.cLogoURLStr = clogoURLStr
      }
      try await UserManager.shared.update(user: user)
   }
   
}