//
//  account.swift
//  74 桌
//
//  Created by yunli on 2023/5/20.
//

import Alamofire
import SwiftUI

struct Constant {
    var cookiesDefaultsKey: String
}

let Constants: Constant = .init(cookiesDefaultsKey: "JSESSIONID")

class CookieHandler {
    static let shared: CookieHandler = .init()

    let defaults = UserDefaults.standard
    let cookieStorage = HTTPCookieStorage.shared

    func getCookie(forURL url: String) -> [HTTPCookie] {
        let computedUrl = URL(string: url)
        let cookies = cookieStorage.cookies(for: computedUrl!) ?? []

        return cookies
    }

    func backupCookies(forURL url: String) {
        var cookieDict = [String: AnyObject]()

        for cookie in getCookie(forURL: url) {
            cookieDict[cookie.name] = cookie.properties as AnyObject?
        }

        defaults.set(cookieDict, forKey: Constants.cookiesDefaultsKey)
    }

    func restoreCookies() {
        if let cookieDictionary = defaults.dictionary(forKey: Constants.cookiesDefaultsKey) {
            for (_, cookieProperties) in cookieDictionary {
                if let cookie = HTTPCookie(properties: cookieProperties as! [HTTPCookiePropertyKey: Any]) {
                    cookieStorage.setCookie(cookie)
                }
            }
        }
    }
}

struct Login: Encodable {
    let user: String
    let pwd: String
    let cook: String
}

struct UserInfo: Encodable {
    var name: String
    var o: String
}

class LoginHandler {
    static let sharedInstance = LoginHandler()

    func getCookie(name: String) -> HTTPCookie? {
        if let cookie = CookieHandler().getCookie(forURL: "https://debug.sdsz.icu:81/").filter({ cookie -> Bool in
            cookie.name == name
        }).first {
            return cookie
        }
        return nil
    }

    func fetchLoginCookie(action: @escaping (_: String) -> Void) {
        if let cookie = getCookie(name: "JSESSIONID") {
            HTTPCookieStorage.shared.deleteCookie(cookie)
            print(cookie)
        }
        let url = "https://debug.sdsz.icu:81/sso/login"

        AF.request(url, method: .get, parameters: nil, encoding: URLEncoding.default, headers: nil).response { _ in
            if let cookie = self.getCookie(name: "JSESSIONID") {
                action(cookie.value)
            }
        }
    }
}

func doLogin(user: String, password: String, action: @escaping (_: Int) -> Void) {
    LoginHandler().fetchLoginCookie { (cookie: String) in
        let login = Login(user: user, pwd: password, cook: cookie)
        print(login)
        AF.request("https://debug.sdsz.icu/andlogin", method: .post, parameters: login, encoder: JSONParameterEncoder.default, headers: nil).responseString { res in
            print("\(res)")
            if res.value == "success" {
                action(1)
            } else {
                action(0)
            }
        }
    }
}

func getUserInfo(userInfo: inout UserInfo) {
    userInfo.name = "向量"
}

struct loginView: View {
    @State var username: String = ""
    @State var password: String = ""
    @State var btnText: String = "登录"
    @State var btnColor: Color = .blue
    @State var inProgress: Bool = false
    @FocusState private var isFocused: Bool
    @Binding var isLoggedIn: Int
    @Binding var userInfo: UserInfo
    var body: some View {
        VStack {
            Form {
                Section {
                    HStack {
                        Image(systemName: "person.fill").foregroundColor(Color(red: 0.7, green: 0.7, blue: 0.7))
                        TextField(text: $username, prompt: Text("数字校园号")) {
                            Text("数字校园号")
                        }.focused($isFocused)
                            .keyboardType(.numberPad)
                    }
                    HStack {
                        Image(systemName: "lock.fill").foregroundColor(Color(red: 0.7, green: 0.7, blue: 0.7))
                        SecureField(text: $password, prompt: Text("密码")) {
                            Text("密码")
                        }.focused($isFocused)
                    }
                }.onTapGesture {
                    isFocused = false
                }
                HStack {
                    Spacer()
                    Button(action: {
                        inProgress = true
                        doLogin(user: username, password: password) { (ret: Int) in
                            isLoggedIn = ret
                            inProgress = false
                            if ret == 0 {
                                btnText = "登录失败"
                                btnColor = .red
                            } else {
                                getUserInfo(userInfo: &userInfo)
                            }
                        }
                    }) {
                        HStack {
                            Text(btnText)
                            if inProgress {
                                ProgressView()
                            }
                        }
                    }.foregroundColor(btnColor).buttonStyle(.bordered)
                }
            }
        }
    }
}

struct accountView: View {
    @State var username: String = ""
    @State var password: String = ""
    @FocusState private var isFocused: Bool
    @Binding var isLoggedIn: Int
    @Binding var userInfo: UserInfo
    var body: some View {
        VStack {
            Form {
                Section(header: Text("基本信息")) {
                    HStack {
                        Text("姓名")
                        Spacer()
                        Text(userInfo.name)
                    }
                    HStack {
                        Text("所属班级")
                        Spacer()
                        Text(userInfo.name)
                    }
                }
                Section {
                    Button(action: {
                        isLoggedIn = 0
                        if let cookie = LoginHandler().getCookie(name: "CASTGC") {
                            HTTPCookieStorage.shared.deleteCookie(cookie)
                            print(cookie)
                        }
                    }) {
                        VStack {
                            Text("退出").foregroundColor(.red)
                        }
                    }
                }
            }
            Spacer()
        }
    }
}

struct accountView_Previews: PreviewProvider {
    @State static var isLoggedIn = 0
    @State static var userInfo: UserInfo = .init(name: "", o: "")
    static var previews: some View {
        loginView(isLoggedIn: $isLoggedIn, userInfo: $userInfo)
    }
}