paiai_ios/PaiAi/Paiai_iOS/App/Login/LoginViewController.swift

//
//  LoginViewController.swift
//  Paiai_iOS
//
//  Created by FFIB on 16/4/17.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit
import PaiaiDataKit
import PaiaiUIKit
import RxSwift

final class LoginViewController: UIViewController {

    @IBOutlet weak var pageControl: UIPageControl!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var guestLoginBtn: UIButton!
    @IBOutlet weak var weixinLoginBtn: UIButton!

    public var userInfoViewModel: UserInfoViewModel!

    fileprivate var disposeBag = DisposeBag()

    override func viewDidLoad() {
        super.viewDidLoad()
        binding()
        setProperties()
    }

    func setProperties() {
        if #available(iOS 11, *) { return }
        automaticallyAdjustsScrollViewInsets = false
    }
}

/// binding UI
extension LoginViewController {
    func binding() {
        bindInteraction()
        bindScrollViewDelegate()
    }

    func bindInteraction() {
        guestLoginBtn.rx.tap
            .bind(to: userInfoViewModel.guestLoginBtnTapped)
            .disposed(by: disposeBag)

        weixinLoginBtn.rx.tap
            .bind(to: userInfoViewModel.wxLoginBtnTapped)
            .disposed(by: disposeBag)
    }

    func bindScrollViewDelegate() {
        scrollView.rx.didEndDecelerating
            .asDriver()
            .drive(onNext: {[weak self] (_) in
                guard let `self` = self else { return }
                self.pageControl.currentPage = Int(self.scrollView.contentOffset.x/self.view.width)
            }).disposed(by: disposeBag)

       scrollView.rx.didScroll
            .asDriver()
            .drive(onNext: {[weak self] (_) in
                guard let `self` = self else { return }
                if self.scrollView.contentOffset.x/self.view.width < 2 {
                    self.weixinLoginBtn.isHidden = true
                    self.guestLoginBtn.isHidden = true
                } else {
                    #if (arch(i386) || arch(x86_64))
                   self.weixinLoginBtn.isHidden = false
                    #else
                    self.weixinLoginBtn.isHidden = !WXApi.isWXAppInstalled()
                    #endif
                    self.guestLoginBtn.isHidden = false
                }
            }).disposed(by: disposeBag)
    }
}

extension LoginViewController: Storyboarded {
    static func instantiate() -> LoginViewController {
        return UIStoryboard.main.instantiateViewController(type: LoginViewController.self)
    }
}