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

import SwiftUI
import PhotosUI

struct PostCompanyView: View {
   @State var isEditing = false//是否在编辑
   @Environment(HUD.self) var hud//提示信息功能
   @Environment(ProfileViewModel.self) var ProfileVM
   @Binding var naviPath: NavigationPath
   var draftUser: DBUser { ProfileVM.draftUser }
   var invalidMsg: String? {
      if draftUser.cName.isBlank { return "公司名字没有写" }
      if draftUser.cProvince.isBlank { return "公司所在省份没有写" }
      if draftUser.cCity.isBlank { return "公司所在城市没有写" }
      if draftUser.cName.count > 50 { return "公司名字不能超过50字" }
      if draftUser.cCity.count > 50 { return "公司所在城市名不能超过50字" }
      if draftUser.cAboutUS.count > 20 { return "公司简介不能超过20字" }
      return nil
   }
   
   
   var body: some View {
      @Bindable var vm = ProfileVM
      ScrollView {
         VStack(alignment: .leading, spacing: 14) {
            HStack {
               Text("公司名称：").littleTStyle()
               TextField("请输入完整公司名称", text: $vm.draftUser.cName, axis: .vertical)
                  .tfStyle()//单行
            }
            HStack {
               Text("公司地址：").littleTStyle()
               Picker("省份", selection: $vm.draftUser.cProvince) {
                  ForEach(kProvinceArr, id: \.self) { Text($0) }
               }.pStyle()
               TextField("城市",text: $vm.draftUser.cCity).tfStyle()
            }
            VStack(alignment: .leading, spacing: 9) {
               Text("公司简介（选填）").littleTStyle()
               TextField("", text: $vm.draftUser.cAboutUS).tfStyleMultiL()
            }
            VStack(alignment: .leading) {
               HStack {
                  Text("公司Logo（选填）").littleTStyle()
                  Text(vm.logoImageErrorMsg).size15pb()
               }
               PhotosPicker(selection: $vm.logoItem, matching: .images, photoLibrary: .shared()) {
                  if let uiImage = vm.logoUIImage {
                     Image(uiImage: uiImage)
                        .resizable()//可改变大小
                     //                         .scaledToFit()//保持宽高比不变，显示完整图片
                        .scaledToFill()//保持宽高比不变，充满空间，会有裁剪
                        .thumbFrame().radius()
                  } else {
                     addImageBtn
                  }
               }
            }
            VStack(alignment: .leading) {
               HStack {
                  Text("公司图片（选填）").littleTStyle()
                  Text(vm.companyUIImagesErrorMsg).size15pb()
               }
               ScrollView(.horizontal) {
                  HStack {
                     if vm.isLoadingCompanyImages {
                        ProgressView().thumbFrame()
                     } else {
                        ForEach(vm.companyUIImages.indices, id: \.self) { i in
                           NavigationLink {
                              CompanyGalleryView(currentPage: i)
                           } label: {
                              Image(uiImage: vm.companyUIImages[i]).resizable().scaledToFill().thumbFrame().radius()
                           }.disabled(!vm.isCompanyImagesLoaded)
                        }
                     }
                     if vm.companyUIImages.count < 6 {
                        PhotosPicker(selection: $vm.companyItems, maxSelectionCount: 6 - vm.companyUIImages.count, matching: .images, photoLibrary: .shared()) { addImageBtn }
                     }
                  }
               }.scrollIndicators(.hidden)
            }
            
            Button {
               //               hud.show("提交成功")
               Task {//开启异步任务
                  await postCompany()
               }
            } label: {
               if vm.isPostingCompany {
                  ProgressView().appleStyleP()//提交加载
               }else {
                  Text("提交").appleStyle()
               }
            }.disabled(vm.isPostingCompany)
            
         }.padding()
         postBottomEView()
      }.scrollIndicators(.hidden).tc().size17().bg()
         .navigationBarBackButtonHidden().navigationBarTitleDisplayMode(.inline)
         .toolbar {
            ToolbarItem(placement: .principal) { Text("公司信息").tc().bold() }
            ToolbarItem(placement: .topBarLeading) {
               Button {
                  if !naviPath.isEmpty {//检查是否为最后一页
                     naviPath.removeLast()//返回上一页
                  }
               } label: {
                  Image(systemName: "chevron.left").secondary().padding(.horizontal,6)
               }
            }
         }
         .toolbarVisibility(.hidden, for: .tabBar)
         .onAppear {
            if ProfileVM.isCompanyImagesLoaded { return }
            Task {
               await vm.loadCompanyLogoAndIamges()
            }
         }
   }
     
   var addImageBtn: some View {
      Image(systemName: "plus").font(.title).secondary().thumbFrame()
         .border(borderColor: Color(.systemGray4))
   }
   func postCompany() async {
      if let invalidMsg = invalidMsg {//也可以写成if let invalidMsg
         hud.show(invalidMsg)
         return
      }
      ProfileVM.isPostingCompany = true
      defer { ProfileVM.isPostingCompany = false }
      UIApplication.shared.hideKeyboard()//收起键盘
      
      do {
         try await ProfileVM.postCompany()
         hud.show("发布成功")
         if !naviPath.isEmpty { naviPath.removeLast() }
      } catch {
         print("上传或修改公司信息失败：\(error)")
         hud.show("上传或修改公司信息失败：\(error)")
      }
      
   }
}