//
//  LaunchViewController.swift
//  SHECommunity
//
//  Created by Lin on 2025/1/3.
//

import UIKit
import RxSwift
import SwiftyUserDefaults
import RxCocoa

class LaunchViewController: BaseViewController {

    private let guideImgList: [String] = [
        "guide_1",
        "guide_2",
        "guide_3",
        "guide_4",
        "guide_5"
    ]
    
    private let showVersion = 1
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        view.backgroundColor = UIColor(hexStr: "#E0F2FF")
        setupLayout()
        
        experienceBtn.rx.tap.subscribe(onNext: { _ in
//            Defaults[\.guideShowVersion] = self.showVersion
            AppDelegate.shared.showMainViewController()
        }).disposed(by: disposeBag)
        
        getUserConfig()
        
        navigateAfterDelay()
    }
    
    private func navigateAfterDelay() {
        Observable.just(())
            .delay(.milliseconds(2500), scheduler: MainScheduler.instance)
            .subscribe(onNext: { [weak self] in
                self?.navigateToNext()
            })
            .disposed(by: disposeBag)
    }

    private func navigateToNext() {
        let hasShownGuide = UserDefaults.standard.bool(forKey: "hasShownGuide")
        if hasShownGuide {
            let loginVC = LoginViewController()
            UIView.transition(with: view.window!, duration: 0.4, options: .transitionCrossDissolve) {
                self.view.window?.rootViewController = UINavigationController(rootViewController: loginVC)
            }
        } else {
            collectionView.isHidden = false
            pageControl.isHidden = false
            experienceBtn.isHidden = false
        }
    }
    
    /// 获取用户配置
    func getUserConfig() {
        SystemService.userConfig().subscribe(onNext: { response in
            self.getUserIMToken()
            guard let model = response.model else { return }
            AppContextManager.shared.systemConfig = model.config
            // 保存用户数据
            AppContextManager.shared.saveAccount(model)
        }, onError: { [weak self] (error) in
            DLAlert.show(title: error.localizedDescription,
                         defaultTitle: "重试") { [weak self] in
                guard let this = self else { return }
                this.getUserConfig()
            }
        }).disposed(by: disposeBag)
    }
    
    /// 获取用户IM Token
    func getUserIMToken() {
        UserService.imToken().subscribe(onNext: { response in
            guard let data = response.data, let token = data["token"] as? String else { return }
            AppContextManager.shared.imToken = token
            // 提前初始化 SDK，减少圈子页等待时间
            GroupIMService.shared.initSDK()
        }).disposed(by: disposeBag)
    }
    
    // MARK: - Init
    init() {
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    lazy var launchLogoView: UIImageView = {
        let view = UIImageView()
        view.image = UIImage(named: "Launch/logo")
        view.backgroundColor = .clear
        view.contentMode = .scaleAspectFill
        return view
    }()
    
    lazy var tipsImgView: UIImageView = {
        let view = UIImageView()
        view.image = UIImage(named: "Launch/slogan")
        view.backgroundColor = .clear
        view.contentMode = .scaleAspectFill
        return view
    }()
    
    /// 引导页
    lazy var collectionView: UICollectionView = {
        let viewFlowLayout = UICollectionViewFlowLayout()
        viewFlowLayout.scrollDirection = .horizontal
        viewFlowLayout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
        viewFlowLayout.minimumLineSpacing = 0
        viewFlowLayout.minimumInteritemSpacing = 0
        viewFlowLayout.itemSize = CGSizeMake(kScreenWidth, kScreenHeight)
        
        let collectionView = UICollectionView(frame: .zero, collectionViewLayout: viewFlowLayout)
        collectionView.backgroundColor = .white
        collectionView.dataSource = self
        collectionView.delegate = self
        collectionView.showsVerticalScrollIndicator = false
        collectionView.showsHorizontalScrollIndicator = false
        collectionView.isPagingEnabled = true
        collectionView.bounces = false
        collectionView.register(GuideCell.self)
        collectionView.isHidden = true
        return collectionView
    }()
    
    lazy var experienceBtn: UIButton = {
        let btn = UIButton(type: .custom)
        btn.setTitle("立即体验", for: .normal)
        btn.setTitleColor(UIColor(hexStr: "#0F2846"), for: .normal)
        btn.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        btn.setBackgroundImage(UIImage(named: "Guide/experience"), for: .normal)
        btn.isHidden = true
        return btn
    }()
    
    lazy var pageControl: JJPageControl = {
        let pageControl = JJPageControl(frame: CGRectMake(0, 0, kScreenWidth, 10))
        pageControl.currentColor = ThemeManager.shared.color.mainColor
        pageControl.currentPointSize = CGSize(width: 20, height: 6)
        pageControl.otherColor = ThemeManager.shared.color.mainColor.withAlphaComponent(0.5)
        pageControl.otherPointSize = CGSize(width: 6, height: 6)
        pageControl.pointCornerRadius = 3
        pageControl.controlSpacing = 18
        pageControl.pageAliment = .Center
        pageControl.backgroundColor = .clear
        pageControl.numberOfPages = guideImgList.count
        pageControl.isHidden = true
        return pageControl
    }()
}

extension LaunchViewController {
    private func setupLayout() {
        view.addSubview(launchLogoView)
        view.addSubview(tipsImgView)
        view.addSubview(collectionView)
        view.addSubview(experienceBtn)
        view.addSubview(pageControl)
        
        launchLogoView.layoutChain
            .centerX()
            .centerY()
        
        tipsImgView.layoutChain
            .centerX()
            .bottom(kSafeBottomMargin + 50)
        
        collectionView.layoutChain.edges()
        
        experienceBtn.layoutChain
            .bottom(kSafeBottomMargin + 23)
            .width(245)
            .height(50)
            .centerX()
        
        pageControl.layoutChain
            .bottomToTopOfView(experienceBtn, offset: -25)
            .edgesHorzontal(10)
            .centerX()
            .height(10)
    }
}

// MARK: - UICollectionViewDataSource
extension LaunchViewController: UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        guideImgList.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell: GuideCell = collectionView.dequeueReusableCell(for: indexPath)
        cell.configure(imageName: guideImgList[indexPath.row])
        return cell
    }
}

// MARK: - UICollectionViewDelegate
extension LaunchViewController: UICollectionViewDelegate {    
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        if scrollView == collectionView {
            let page = Int(scrollView.contentOffset.x / scrollView.dl.width)
            pageControl.currentPage = page
        }
    }
}

class GuideCell: UICollectionViewCell {
    
    func configure(imageName: String) {
        imgView.image = UIImage(named: "Guide/" + imageName)
    }
    
    private func setupSubViews() {
        addSubview(imgView)
        setupLayout()
    }
    
    private func setupLayout() {
        imgView.layoutChain.edges()
    }
    
    lazy var imgView: UIImageView = {
        let icon = UIImageView()
        icon.contentMode = .scaleAspectFill
        return icon
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        contentView.backgroundColor = .clear
        setupSubViews()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}