//
//  LNLoginPhoneInputViewController.swift
//  Gami
//
//  Created by OneeChan on 2026/1/15.
//

import Foundation
import UIKit
import SnapKit


extension UIView {
    func pushToLoginPhone() {
        let vc = LNLoginPhoneInputViewController()
        navigationController?.pushViewController(vc, animated: true)
    }
}


class LNLoginPhoneInputViewController: LNViewController {
    private let container = UIView()
    
    private let countryIcon = UIImageView()
    private let countryCodeLabel = UILabel()
    private let phoneInputView = LNTextField()
    
    private let confirmButton = UIButton()
    
    private var sections: [(code: String, list: [LNCountryCodeVO])] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        loadCountryCodeList()
        
        setupViews()
        
        LNEventDeliver.addObserver(self)
    }
}

extension LNLoginPhoneInputViewController {
    private func loadCountryCodeList() {
        LNConfigManager.shared.getCountryCodeList { [weak self] list in
            guard let self else { return }
            guard let list else { return }
            
            sortList(list)
        }
    }
    
    private func sortList(_ list: [LNCountryCodeVO]) {
        sections.removeAll()
        
        var map: [String: [LNCountryCodeVO]] = [:]
        for item in list {
            let first = item.name.classificationFirstLetter
            var section = map[first] ?? []
            section.append(item)
            map[first] = section
        }
        
        let keys = map.keys.sorted()
        for key in keys {
            sections.append((key, map[key]) as! (code: String, list: [LNCountryCodeVO]))
        }
        
        var item: LNCountryCodeVO? = list.first {
            $0.code == LNAppConfig.shared.curLang.countryCode
        }
        if item == nil {
            item = list.first {
                $0.code == LNAppLanguage.indonesian.countryCode
            }
        }
        if let item {
            countryIcon.sd_setImage(with: URL(string: item.icon))
            countryCodeLabel.text = item.num
        }
    }
}

extension LNLoginPhoneInputViewController: LNAccountManagerNotify {
    func onLoginCaptchaCoolDownChanged(time: Int) {
        let text: String = if time == 0 {
            .init(key: "B00023")
        } else {
            .init(key: "B00023") + " (\(time)s)"
        }
        confirmButton.setTitle(text, for: .normal)
        checkConfirmButton()
    }
}

extension LNLoginPhoneInputViewController {
    private func checkConfirmButton() {
        let text = phoneInputView.text ?? ""
        confirmButton.isEnabled = !text.isEmpty && LNAccountManager.shared.canSendCaptcha
    }
    
    private func setupViews() {
        navigationBarColor = .clear
        
        let cover = UIImageView(image: .icLoginPhoneBg)
        view.addSubview(cover)
        cover.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.top.equalTo(fakeNaviBgView)
        }
        
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineHeightMultiple = 0.8
        
        let titleLabel = UILabel()
        titleLabel.attributedText = .init(string: .init(key: "B00020"), attributes: [
            .paragraphStyle: paragraphStyle,
        ])
        titleLabel.font = .heading_h1
        titleLabel.textColor = .text_5
        titleLabel.numberOfLines = 0
        titleLabel.clipsToBounds = false
        titleLabel.layer.masksToBounds = false
        view.addSubview(titleLabel)
        titleLabel.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(24)
            make.bottom.equalTo(cover.snp.bottom).offset(-42)
        }
        
        container.backgroundColor = .fill
        container.layer.cornerRadius = 20
        container.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        view.addSubview(container)
        container.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.top.equalTo(titleLabel.snp.bottom).offset(12)
            make.bottom.equalToSuperview()
        }
        
        let phoneInput = buildPhoneInput()
        container.addSubview(phoneInput)
        phoneInput.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(22)
            make.top.equalToSuperview().offset(26)
        }
        
        let confirm = buildConfirmButton()
        container.addSubview(confirm)
        confirm.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(22)
            make.top.equalTo(phoneInput.snp.bottom).offset(24)
        }
        
        let loginMethods = buildOtherLoginMethod()
        container.addSubview(loginMethods)
        loginMethods.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview()
            make.bottom.equalToSuperview().offset(view.commonBottomInset)
        }
        
        view.onTap { [weak self] in
            guard let self else { return }
            view.endEditing(true)
        }
    }
    
    private func buildPhoneInput() -> UIView {
        let container = UIView()
        container.backgroundColor = .fill_2
        container.layer.cornerRadius = 26
        container.snp.makeConstraints { make in
            make.height.equalTo(52)
        }
        
        let countryView = UIView()
        countryView.onTap { [weak self] in
            guard let self else { return }
            guard !sections.isEmpty else { return }
            
            let panel = LNCountrySelectPanel()
            panel.containerHeight = .height(self.container.bounds.height)
            panel.update(sections)
            panel.handler = { [weak self] item in
                guard let self else { return }
                countryIcon.sd_setImage(with: URL(string: item.icon))
                countryCodeLabel.text = item.num
            }
            panel.popup()
        }
        container.addSubview(countryView)
        countryView.snp.makeConstraints { make in
            make.verticalEdges.equalToSuperview()
            make.leading.equalToSuperview()
        }
        
        countryIcon.layer.cornerRadius = 12
        countryIcon.clipsToBounds = true
        countryView.addSubview(countryIcon)
        countryIcon.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalToSuperview().offset(16)
            make.width.height.equalTo(24)
        }
        
        countryCodeLabel.font = .heading_h2
        countryCodeLabel.textColor = .text_5
        countryCodeLabel.setContentHuggingPriority(.defaultHigh, for: .horizontal)
        countryCodeLabel.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
        countryView.addSubview(countryCodeLabel)
        countryCodeLabel.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(countryIcon.snp.trailing).offset(4)
        }
        
        let config = UIImage.SymbolConfiguration(pointSize: 10)
        let arrow = UIImageView()
        arrow.image = .init(systemName: "chevron.down", withConfiguration: config)?.withRenderingMode(.alwaysTemplate)
        arrow.tintColor = .text_5
        countryView.addSubview(arrow)
        arrow.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(countryCodeLabel.snp.trailing).offset(4)
            make.trailing.equalToSuperview()
            make.width.equalTo(12)
        }
        
        phoneInputView.font = .heading_h2
        phoneInputView.textColor = .text_5
        phoneInputView.attributedPlaceholder = .init(string: .init(key: "B00021"), attributes: [
            .font: UIFont.body_l,
            .foregroundColor: UIColor.text_2
        ])
        phoneInputView.clearButtonMode = .always
        phoneInputView.keyboardType = .numberPad
        phoneInputView.cursorWidth = 2
        phoneInputView.cursorHeight = 18
        phoneInputView.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            checkConfirmButton()
        }), for: .editingChanged)
        container.addSubview(phoneInputView)
        phoneInputView.snp.makeConstraints { make in
            make.centerY.equalToSuperview()
            make.leading.equalTo(countryView.snp.trailing).offset(12)
            make.trailing.equalToSuperview().offset(-12)
        }
        
        return container
    }
    
    private func buildConfirmButton() -> UIView {
        confirmButton.setBackgroundImage(.primary_8, for: .normal)
        confirmButton.layer.cornerRadius = 23.5
        confirmButton.clipsToBounds = true
        confirmButton.setTitle(.init(key: "B00023"), for: .normal)
        confirmButton.setTitleColor(.text_1, for: .normal)
        confirmButton.titleLabel?.font = .heading_h3
        confirmButton.isEnabled = false
        confirmButton.addAction(UIAction(handler: { [weak self] _ in
            guard let self else { return }
            let code = countryCodeLabel.text
            let phone = phoneInputView.text
            guard let code, let phone else { return }
            showLoading()
            LNAccountManager.shared.getLoginCaptcha(code: code, phone: phone)
            { [weak self] success in
                dismissLoading()
                guard let self else { return }
                guard success else { return }
                
                view.pushToLoginCaptcha(code: code, phone: phone)
            }
        }), for: .touchUpInside)
        confirmButton.snp.makeConstraints { make in
            make.height.equalTo(47)
        }
        
        return confirmButton
    }
    
    private func buildOtherLoginMethod() -> UIView {
        let container = UIView()
        
        let titleLabel = UILabel()
        titleLabel.text = .init(key: "B00099")
        titleLabel.font = .body_m
        titleLabel.textColor = .text_3
        titleLabel.textAlignment = .center
        container.addSubview(titleLabel)
        titleLabel.snp.makeConstraints { make in
            make.horizontalEdges.equalToSuperview().inset(24)
            make.top.equalToSuperview()
        }
        
        let stackView = UIStackView()
        stackView.axis = .horizontal
        stackView.spacing = 62
        container.addSubview(stackView)
        stackView.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.leading.greaterThanOrEqualToSuperview()
            make.top.equalTo(titleLabel.snp.bottom).offset(20)
            make.bottom.equalToSuperview()
        }
        
        let google = buildLoginMethod(icon: .icGoogle)
        google.onTap { [weak self] in
            guard let self else { return }
            LNAccountManager.shared.doGoogleLogin(self)
        }
        stackView.addArrangedSubview(google)
        
        let apple = buildLoginMethod(icon: .icApple.withTintColor(.init(hex: "#0B0B0A"), renderingMode: .alwaysOriginal))
        apple.onTap { [weak self] in
            guard self != nil else { return }
            LNAccountManager.shared.doAppleLogin()
        }
        stackView.addArrangedSubview(apple)
        
        return container
    }
    
    private func buildLoginMethod(icon: UIImage) -> UIView {
        let container = UIView()
        container.backgroundColor = .fill_2
        container.layer.cornerRadius = 20
        container.snp.makeConstraints { make in
            make.width.height.equalTo(40)
        }
        
        let imageView = UIImageView()
        imageView.image = icon
        container.addSubview(imageView)
        imageView.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
        
        return container
    }
}

#if DEBUG

import SwiftUI

struct LNLoginPhoneInputViewControllerPreview: UIViewControllerRepresentable {
    func makeUIViewController(context: Context) -> some UIViewController {
        LNLoginPhoneInputViewController()
    }
    
    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
        
    }
}

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