Lanu_iOS/Lanu/Views/Login/LNLoginViewController.swift

//
//  LNLoginViewController.swift
//  Lanu
//
//  Created by OneeChan on 2025/11/11.
//

import Foundation
import UIKit
import SnapKit
import GoogleSignIn

class LNLoginViewController: LNViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupViews()
    }
}

extension LNLoginViewController {
    private func setupViews() {
        showNavigationBar = false
        
        let bg = UIImageView()
        bg.image = .icLoginBg
        view.addSubview(bg)
        bg.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        
#if DEBUG
        let email = buildEmail()
        view.addSubview(email)
        email.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.centerY.equalToSuperview().multipliedBy(1.3)
        }
#endif
        
        let google = buildGoogleLogin()
        view.addSubview(google)
        google.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(38)
            make.centerY.equalToSuperview().multipliedBy(1.5)
        }
        
        let privacy = buildPrivacy()
        view.addSubview(privacy)
        privacy.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.width.equalToSuperview().offset(-50)
            make.bottom.equalTo(view.safeAreaLayoutGuide.snp.bottom).offset(-40)
        }
    }
    
    private func buildGoogleLogin() -> UIView {
        let button = UIButton()
        button.backgroundColor = .fill
        button.layer.cornerRadius = 24
        button.snp.makeConstraints { make in
            make.height.equalTo(48)
        }
        
        let ic = UIImageView()
        ic.image = .google
        button.addSubview(ic)
        ic.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalToSuperview().offset(22)
            make.width.height.equalTo(20)
        }
        
        let title = UILabel()
        title.font = .heading_h3
        title.textColor = .text_5
        title.text = .init(key: "A00115")
        button.addSubview(title)
        title.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
        
        button.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            GIDSignIn.sharedInstance.signIn(withPresenting: self) { [weak self] result, err in
                guard self != nil else { return }
                guard err == nil, let result else { return }
                guard let token = result.user.idToken?.tokenString else { return }
                LNAccountManager.shared.loginByGoogle(data: token)
            }
        }), for: .touchUpInside)
        
        return button
    }
    
    private func buildPrivacy() -> UIView {
        let text: String = .init(key: "A00116")
        let attrStr = NSMutableAttributedString(string: text)
        let agreementRange = (text as NSString).range(of: .init(key: "A00117"))
        attrStr.addAttribute(.link, value: String.serviceUrl, range: agreementRange)
        let privacyRange = (text as NSString).range(of: .init(key: "A00118"))
        attrStr.addAttribute(.link, value: String.privacyUrl, range: privacyRange)
        
        let privacyView = LNPrivacyTextView()
        privacyView.attributedText = attrStr
        privacyView.textAlignment = .center
        privacyView.backgroundColor = .clear
        privacyView.font = .systemFont(ofSize: 13.4)
        privacyView.textColor = .text_4
        privacyView.linkTextAttributes = [.foregroundColor: UIColor.text_5]
        
        return privacyView
    }
    
#if DEBUG
    private func buildEmail() -> UIView {
        let container = UIView()
        
        let input = UITextField()
        container.addSubview(input)
        input.snp.makeConstraints { make in
            make.leading.verticalEdges.equalToSuperview()
            make.width.equalTo(150)
        }
        
        let login = UIButton()
        login.setImage(.init(systemName: "arrow.forward"), for: .normal)
        login.addAction(UIAction(handler: { [weak self] _ in
            guard self != nil else { return }
            guard let text = input.text, !text.isEmpty else { return }
            LNAccountManager.shared.loginByEmail(email: text) { _ in }
        }), for: .touchUpInside)
        container.addSubview(login)
        login.snp.makeConstraints { make in
            make.centerY.trailing.equalToSuperview()
            make.leading.equalTo(input.snp.trailing).offset(5)
        }
        
        view.onTap { [weak self] in
            guard let self else { return }
            self.view.endEditing(true)
        }
        
        return container
    }
#endif
}

#if DEBUG

import SwiftUI

struct LNLoginViewControllerPreview: UIViewControllerRepresentable {
    func makeUIViewController(context: Context) -> some UIViewController {
        LNNavigationController(rootViewController: LNLoginViewController())
    }
    
    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
        
    }
}

#Preview(body: {
    LNLoginViewControllerPreview()
})
#endif