//
//  EPEditSettingViewController.swift
//  YuMi
//
//  Created by AI on 2025-01-27.
//

import UIKit
import Photos
import SnapKit

/// 设置编辑页面
/// 支持头像更新、昵称修改和退出登录功能
class EPEditSettingViewController: BaseViewController {

    // MARK: - UI Components
    private lazy var profileImageView: UIImageView = {
        let imageView = UIImageView()
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = 60 // 120/2 = 60
        imageView.layer.masksToBounds = true
        imageView.backgroundColor = .systemGray5
        imageView.isUserInteractionEnabled = true
        return imageView
    }()
    
    private lazy var cameraIconView: UIImageView = {
        let imageView = UIImageView()
        imageView.contentMode = .scaleAspectFit
        imageView.image = UIImage(named: "icon_setting_camear")
        imageView.backgroundColor = UIColor(hex: "#0C0527")
        imageView.layer.cornerRadius = 15 // 30/2 = 15
        imageView.layer.masksToBounds = true
        return imageView
    }()
    
    private lazy var tableView: UITableView = {
        let tableView = UITableView(frame: .zero, style: .plain)
        tableView.backgroundColor = UIColor(hex: "#0C0527")
        tableView.separatorStyle = .none
        tableView.delegate = self
        tableView.dataSource = self
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "SettingCell")
        tableView.isScrollEnabled = true // 启用内部滚动
        return tableView
    }()
    
    // MARK: - Data
    
    private var settingItems: [SettingItem] = []
    private var userInfo: UserInfoModel?
    private var apiHelper: EPMineAPIHelper = EPMineAPIHelper()
    
    // MARK: - Lifecycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupNavigationBar()
        setupUI()
        setupData()
        loadUserInfo()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.setNavigationBarHidden(false, animated: animated)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        // 恢复父页面的导航栏配置（透明）
        restoreParentNavigationBarStyle()
    }
    
    // MARK: - Setup
    
    private func setupNavigationBar() {
        title = YMLocalizedString("EPEditSetting.Title")
        
        // 配置导航栏外观（iOS 13+）
        let appearance = UINavigationBarAppearance()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = UIColor(hex: "#0C0527")
        appearance.titleTextAttributes = [
            .foregroundColor: UIColor.white,
            .font: UIFont.systemFont(ofSize: 18, weight: .medium)
        ]
        appearance.shadowColor = .clear // 移除底部分割线
        
        navigationController?.navigationBar.standardAppearance = appearance
        navigationController?.navigationBar.scrollEdgeAppearance = appearance
        navigationController?.navigationBar.compactAppearance = appearance
        navigationController?.navigationBar.tintColor = .white // 返回按钮颜色
        
        // 隐藏返回按钮文字，只保留箭头
        navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
        
        // 如果是从上一页 push 进来的，也要修改上一页的 backButtonTitle
        navigationController?.navigationBar.topItem?.backBarButtonItem = UIBarButtonItem(
            title: "",
            style: .plain,
            target: nil,
            action: nil
        )
    }
    
    private func restoreParentNavigationBarStyle() {
        // 恢复透明导航栏（EPMineViewController 使用的是透明导航栏）
        let transparentAppearance = UINavigationBarAppearance()
        transparentAppearance.configureWithTransparentBackground()
        transparentAppearance.backgroundColor = .clear
        transparentAppearance.shadowColor = .clear
        
        navigationController?.navigationBar.standardAppearance = transparentAppearance
        navigationController?.navigationBar.scrollEdgeAppearance = transparentAppearance
        navigationController?.navigationBar.compactAppearance = transparentAppearance
    }
    
    private func setupUI() {
        view.backgroundColor = UIColor(hex: "#0C0527")
        
        // 设置头像布局
        view.addSubview(profileImageView)
        profileImageView.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide.snp.top).offset(40)
            make.centerX.equalTo(view)
            make.size.equalTo(120)
        }
        
        // 设置相机图标布局
        view.addSubview(cameraIconView)
        cameraIconView.snp.makeConstraints { make in
            make.bottom.equalTo(profileImageView.snp.bottom)
            make.trailing.equalTo(profileImageView.snp.trailing)
            make.size.equalTo(30)
        }
        
        // 设置 TableView 布局
        view.addSubview(tableView)
        tableView.snp.makeConstraints { make in
            make.top.equalTo(profileImageView.snp.bottom).offset(40)
            make.leading.trailing.bottom.equalTo(view)
        }
        
        // 添加头像点击手势
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(profileImageTapped))
        profileImageView.addGestureRecognizer(tapGesture)
        
        // 添加相机图标点击手势
        let cameraTapGesture = UITapGestureRecognizer(target: self, action: #selector(profileImageTapped))
        cameraIconView.addGestureRecognizer(cameraTapGesture)
    }
    
    
    
    private func setupData() {
        settingItems = [
            SettingItem(
                title: YMLocalizedString("EPEditSetting.PersonalInfo"),
                action: { [weak self] in self?.handleReservedAction("PersonalInfo") }
            ),
            SettingItem(
                title: YMLocalizedString("EPEditSetting.Help"),
                action: { [weak self] in self?.handleReservedAction("Help") }
            ),
            SettingItem(
                title: YMLocalizedString("EPEditSetting.ClearCache"),
                action: { [weak self] in self?.handleReservedAction("ClearCache") }
            ),
            SettingItem(
                title: YMLocalizedString("EPEditSetting.CheckUpdate"),
                action: { [weak self] in self?.handleReservedAction("CheckUpdate") }
            ),
            SettingItem(
                title: YMLocalizedString("EPEditSetting.Logout"),
                style: .default,
                action: { [weak self] in self?.showLogoutConfirm() }
            ),
            SettingItem(
                title: YMLocalizedString("EPEditSetting.AboutUs"),
                action: { [weak self] in self?.handleReservedAction("AboutUs") }
            )
        ]
        NSLog("[EPEditSetting] setupData 完成，设置项数量: \(settingItems.count)")
    }
    
    private func loadUserInfo() {
        // 如果已经有用户信息（从 EPMineViewController 传递），则不需要重新加载
        if userInfo != nil {
            updateProfileImage()
            tableView.reloadData()
            return
        }
        
        // 获取当前用户信息
        guard let uid = AccountInfoStorage.instance().getUid(), !uid.isEmpty else {
            print("[EPEditSetting] 未登录，无法获取用户信息")
            return
        }
        
        // TODO: 调用API获取用户详细信息
        // 这里暂时创建默认的UserInfoModel用于显示
        let tempUserInfo = UserInfoModel()
        tempUserInfo.nick = "User"
        tempUserInfo.avatar = ""
        userInfo = tempUserInfo
        
        updateProfileImage()
        tableView.reloadData()
    }
    
    private func updateProfileImage() {
        guard let avatarUrl = userInfo?.avatar, !avatarUrl.isEmpty else {
            profileImageView.image = UIImage(systemName: "person.circle.fill")
            return
        }
        
        // 使用SDWebImage加载头像
        if let url = URL(string: avatarUrl) {
            profileImageView.sd_setImage(with: url, placeholderImage: UIImage(systemName: "person.circle.fill"))
        }
    }
    
    // MARK: - Actions
    
    @objc private func profileImageTapped() {
        showAvatarSelectionSheet()
    }
    
    @objc private func openSettings() {
        // 预留设置按钮功能
        handleReservedAction("Settings")
    }
    
    private func showAvatarSelectionSheet() {
        let alert = UIAlertController(title: YMLocalizedString("EPEditSetting.EditNickname"), message: nil, preferredStyle: .actionSheet)
        
        // 拍照选项
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Camera"), style: .default) { [weak self] _ in
            self?.checkCameraPermissionAndPresent()
        })

        // 相册选项
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.PhotoLibrary"), style: .default) { [weak self] _ in
            self?.checkPhotoLibraryPermissionAndPresent()
        })
        
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Cancel"), style: .cancel))
        
        // iPad支持
        if let popover = alert.popoverPresentationController {
            popover.sourceView = profileImageView
            popover.sourceRect = profileImageView.bounds
        }
        
        present(alert, animated: true)
    }
    
    private func checkCameraPermissionAndPresent() {
        YYUtility.checkCameraAvailable { [weak self] in
            self?.presentImagePicker(sourceType: .camera)
        } denied: { [weak self] in
            self?.showPermissionAlert(title: "Camera Access", message: "Please allow camera access in Settings")
        } restriction: { [weak self] in
            self?.showPermissionAlert(title: "Camera Restricted", message: "Camera access is restricted on this device")
        }
    }
    
    private func checkPhotoLibraryPermissionAndPresent() {
        YYUtility.checkAssetsLibrayAvailable { [weak self] in
            self?.presentImagePicker(sourceType: .photoLibrary)
        } denied: { [weak self] in
            self?.showPermissionAlert(title: "Photo Library Access", message: "Please allow photo library access in Settings")
        } restriction: { [weak self] in
            self?.showPermissionAlert(title: "Photo Library Restricted", message: "Photo library access is restricted on this device")
        }
    }
    
    private func presentImagePicker(sourceType: UIImagePickerController.SourceType) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = sourceType
        imagePicker.allowsEditing = true
        present(imagePicker, animated: true)
    }
    
    private func showPermissionAlert(title: String, message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "Settings", style: .default) { _ in
            if let settingsURL = URL(string: UIApplication.openSettingsURLString) {
                UIApplication.shared.open(settingsURL)
            }
        })
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Cancel"), style: .cancel))
        present(alert, animated: true)
    }
    
    private func showNicknameEditAlert() {
        let alert = UIAlertController(
            title: YMLocalizedString("EPEditSetting.EditNickname"),
            message: nil,
            preferredStyle: .alert
        )
        
        alert.addTextField { [weak self] textField in
            textField.text = self?.userInfo?.nick ?? ""
            textField.placeholder = YMLocalizedString("EPEditSetting.EnterNickname")
        }
        
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Cancel"), style: .cancel))
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Confirm"), style: .default) { [weak self] _ in
            guard let newNickname = alert.textFields?.first?.text, !newNickname.isEmpty else { return }
            self?.updateNickname(newNickname)
        })
        
        present(alert, animated: true)
    }
    
    private func updateNickname(_ newNickname: String) {
        // 显示加载状态
        showLoading()
        
        // 调用 API 更新昵称
        apiHelper.updateNickname(withNick: newNickname, 
            completion: { [weak self] in
                self?.hideHUD()
                
                // 更新成功后才更新本地显示
                self?.userInfo?.nick = newNickname
                self?.tableView.reloadData()
                
                // 显示成功提示
                self?.showSuccessToast(YMLocalizedString("XPMineUserInfoEditViewController13"))
                
                print("[EPEditSetting] 昵称更新成功: \(newNickname)")
            },
            failure: { [weak self] (code: Int, msg: String?) in
                self?.hideHUD()
                
                // 显示错误提示
                let errorMsg = msg ?? "昵称更新失败，请稍后重试"
                self?.showErrorToast(errorMsg)
                
                print("[EPEditSetting] 昵称更新失败: \(code) - \(errorMsg)")
            }
        )
    }
    
    private func showLogoutConfirm() {
        let alert = UIAlertController(
            title: YMLocalizedString("EPEditSetting.LogoutConfirm"),
            message: nil,
            preferredStyle: .alert
        )
        
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Cancel"), style: .cancel))
        alert.addAction(UIAlertAction(title: YMLocalizedString("EPEditSetting.Logout"), style: .destructive) { [weak self] _ in
            self?.performLogout()
        })
        
        present(alert, animated: true)
    }
    
    private func performLogout() {
        guard let account = AccountInfoStorage.instance().accountModel else {
            print("[EPEditSetting] 账号信息不存在")
            return
        }
        
        // 调用登出API
        Api.logoutCurrentAccount({ [weak self] (data, code, msg) in
            DispatchQueue.main.async {
                // 清除本地数据
                AccountInfoStorage.instance().saveAccountInfo(nil)
                AccountInfoStorage.instance().saveTicket(nil)
                
                // 跳转登录页
                self?.navigateToLogin()
            }
        }, access_token: account.access_token)
    }
    
    private func navigateToLogin() {
        let loginVC = EPLoginViewController()
        let nav = UINavigationController(rootViewController: loginVC)
        
        if let window = UIApplication.shared.windows.first {
            window.rootViewController = nav
            window.makeKeyAndVisible()
        }
        
        print("[EPEditSetting] 已跳转到登录页面")
    }
    
    private func handleReservedAction(_ title: String) {
        print("[\(title)] - 功能预留,待后续实现")
        // TODO: Phase 2 implementation
        
        // 显示占位提示
        let alert = UIAlertController(title: "Coming Soon", message: "This feature will be available in the next update.", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        present(alert, animated: true)
    }
    
    // MARK: - Public Methods
    
    /// 更新用户信息（从 EPMineViewController 传递）
    @objc func updateWithUserInfo(_ userInfo: UserInfoModel) {
        self.userInfo = userInfo
        updateProfileImage()
        tableView.reloadData()
        NSLog("[EPEditSetting] 已更新用户信息: \(userInfo.nick ?? "未知")")
    }
}

// MARK: - UITableViewDataSource & UITableViewDelegate

extension EPEditSettingViewController: UITableViewDataSource, UITableViewDelegate {
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1 // 只有一个 section
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let count = settingItems.count + 1 // +1 for nickname row
        NSLog("[EPEditSetting] TableView rows count: \(count), settingItems: \(settingItems.count)")
        return count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "SettingCell", for: indexPath)
        cell.backgroundColor = UIColor(hex: "#0C0527")
        cell.textLabel?.textColor = .white
        cell.selectionStyle = .none
        
        // 清除之前的自定义视图
        cell.contentView.subviews.forEach { $0.removeFromSuperview() }
        
        if indexPath.row == 0 {
            // 昵称行
            cell.textLabel?.text = YMLocalizedString("EPEditSetting.Nickname")
            
            // 添加右箭头图标
            let arrowImageView = UIImageView()
            arrowImageView.image = UIImage(named: "icon_setting_right_arrow")
            arrowImageView.contentMode = .scaleAspectFit
            cell.contentView.addSubview(arrowImageView)
            arrowImageView.snp.makeConstraints { make in
                make.trailing.equalToSuperview().offset(-20)
                make.centerY.equalToSuperview()
                make.size.equalTo(22)
            }
            
            // 添加用户昵称标签
            let nicknameLabel = UILabel()
            nicknameLabel.text = userInfo?.nick ?? "未设置"
            nicknameLabel.textColor = .lightGray
            nicknameLabel.font = UIFont.systemFont(ofSize: 16)
            cell.contentView.addSubview(nicknameLabel)
            nicknameLabel.snp.makeConstraints { make in
                make.trailing.equalTo(arrowImageView.snp.leading).offset(-12)
                make.centerY.equalToSuperview()
            }
            
        } else {
            // 其他设置项
            let item = settingItems[indexPath.row - 1]
            cell.textLabel?.text = item.title
            
            // 添加右箭头图标
            let arrowImageView = UIImageView()
            arrowImageView.image = UIImage(named: "icon_setting_right_arrow")
            arrowImageView.contentMode = .scaleAspectFit
            cell.contentView.addSubview(arrowImageView)
            arrowImageView.snp.makeConstraints { make in
                make.trailing.equalToSuperview().offset(-20)
                make.centerY.equalToSuperview()
                make.size.equalTo(22)
            }
            
            if item.style == .default {
                cell.textLabel?.textColor = .systemRed
            } else {
                cell.textLabel?.textColor = .white
            }
        }
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 60 // 所有行都是 60pt 高度
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
        if indexPath.row == 0 {
            // 昵称点击
            showNicknameEditAlert()
        } else {
            // 设置项点击
            let item = settingItems[indexPath.row - 1]
            item.action()
        }
    }
    
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 0
    }
    
    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        return nil
    }
    
    func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
        return 0
    }
    
    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
        return nil
    }
}

// MARK: - UIImagePickerControllerDelegate & UINavigationControllerDelegate

extension EPEditSettingViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        picker.dismiss(animated: true)
        
        guard let image = info[.editedImage] as? UIImage ?? info[.originalImage] as? UIImage else {
            print("[EPEditSetting] 未能获取选择的图片")
            return
        }
        
        // 更新头像显示
        profileImageView.image = image
        
        // 上传头像到腾讯云
        uploadAvatar(image)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true)
    }
    
    private func uploadAvatar(_ image: UIImage) {
        // 显示上传进度
        EPProgressHUD.showProgress(0, total: 1)
        
        // 使用 EPSDKManager 统一上传接口（避免腾讯云 OCR 配置问题）
        EPSDKManager.shared.uploadImages([image], 
            progress: { uploaded, total in
                EPProgressHUD.showProgress(uploaded, total: total)
            },
            success: { [weak self] resList in
                EPProgressHUD.dismiss()
                
                guard !resList.isEmpty,
                      let firstRes = resList.first,
                      let avatarUrl = firstRes["resUrl"] as? String else {
                    print("[EPEditSetting] 头像上传成功但无法获取URL")
                    
                    return
                }
                
                print("[EPEditSetting] 头像上传成功: \(avatarUrl)")
                
                // 调用API更新头像
                self?.updateAvatarAPI(avatarUrl: avatarUrl)
            },
            failure: { [weak self] errorMsg in
                EPProgressHUD.dismiss()
                print("[EPEditSetting] 头像上传失败: \(errorMsg)")
                
                // 显示错误提示
                DispatchQueue.main.async {
                    let alert = UIAlertController(title: "上传失败", message: errorMsg, preferredStyle: .alert)
                    alert.addAction(UIAlertAction(title: "确定", style: .default))
                    self?.present(alert, animated: true)
                }
            }
        )
    }
    
    private func updateAvatarAPI(avatarUrl: String) {
        // 使用 API Helper 更新头像
        apiHelper.updateAvatar(withUrl: avatarUrl, completion: { [weak self] in
            print("[EPEditSetting] 头像更新成功")
            
            // 更新本地用户信息
            self?.userInfo?.avatar = avatarUrl
            
            // 通知父页面头像已更新
            self?.notifyParentAvatarUpdated(avatarUrl)
            
        }, failure: { [weak self] (code: Int, msg: String?) in
            print("[EPEditSetting] 头像更新失败: \(code) - \(msg ?? "未知错误")")
            
            // 显示错误提示
            DispatchQueue.main.async {
                let alert = UIAlertController(
                    title: "更新失败",
                    message: msg ?? "头像更新失败，请稍后重试",
                    preferredStyle: .alert
                )
                alert.addAction(UIAlertAction(title: "确定", style: .default))
                self?.present(alert, animated: true)
            }
        })
    }
    
    private func notifyParentAvatarUpdated(_ avatarUrl: String) {
        // 发送通知给 EPMineViewController 更新头像
        let userInfo = ["avatarUrl": avatarUrl]
        NotificationCenter.default.post(name: NSNotification.Name("EPEditSettingAvatarUpdated"), object: nil, userInfo: userInfo)
    }
}

// MARK: - Helper Models

private struct SettingItem {
    let title: String
    let style: UITableViewCell.SelectionStyle
    let action: () -> Void
    
    init(title: String, style: UITableViewCell.SelectionStyle = .default, action: @escaping () -> Void) {
        self.title = title
        self.style = style
        self.action = action
    }
}

// MARK: - UIColor Extension

private extension UIColor {
    convenience init(hex: String) {
        let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int: UInt64 = 0
        Scanner(string: hex).scanHexInt64(&int)
        let a, r, g, b: UInt64
        switch hex.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            (a, r, g, b) = (1, 1, 1, 0)
        }
        
        self.init(
            red: CGFloat(r) / 255,
            green: CGFloat(g) / 255,
            blue: CGFloat(b) / 255,
            alpha: CGFloat(a) / 255
        )
    }
}