//
//  ProfileViewController.swift
//  suixinkan
//

import PhotosUI
import SnapKit
import UIKit

/// 我的 Tab 根页面，展示个人信息、账号状态与子流程入口。
final class ProfileViewController: BaseViewController {

    private let viewModel = ProfileViewModel()
    private let profileAPI = NetworkServices.shared.profileAPI
    private let ossUploadService = NetworkServices.shared.ossUploadService

    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let refreshControl = UIRefreshControl()

    private let avatarImageView = UIImageView()
    private let nicknameField = UITextField()
    private let uidLabel = UILabel()
    private let editButton = AppButton(title: "编辑", style: .primary)

    private let infoCard = UIStackView()
    private let nameRow = ProfileInfoRowView(title: "姓名")
    private let accountRow = ProfileInfoRowView(title: "当前账号")
    private let phoneRow = ProfileInfoRowView(title: "手机号")
    private let withdrawalRow = ProfileInfoRowView(title: "提现设置")
    private let passwordRow = ProfileInfoRowView(title: "修改密码")
    private let realNameRow = ProfileInfoRowView(title: "认证状态")
    private let statusRow = ProfileInfoRowView(title: "账号状态")
    private let scenicRow = ProfileInfoRowView(title: "当前景区")
    private let logoutButton = UIButton(type: .system)

    override func setupNavigationBar() {
        title = "个人信息"
    }

    override func setupUI() {
        view.backgroundColor = UIColor(hex: 0xF7FAFF)

        scrollView.alwaysBounceVertical = true
        scrollView.refreshControl = refreshControl
        view.addSubview(scrollView)
        scrollView.addSubview(contentStack)

        contentStack.axis = .vertical
        contentStack.spacing = 24
        contentStack.layoutMargins = UIEdgeInsets(top: 16, left: 15, bottom: 24, right: 15)
        contentStack.isLayoutMarginsRelativeArrangement = true

        setupHeader()
        setupInfoCard()
        setupLogoutButton()

        contentStack.addArrangedSubview(headerContainer)
        contentStack.addArrangedSubview(infoCardWrapper)
        contentStack.addArrangedSubview(logoutButton)
    }

    override func setupConstraints() {
        scrollView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        contentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview()
            make.width.equalTo(scrollView.snp.width)
        }
        logoutButton.snp.makeConstraints { make in
            make.height.equalTo(46)
        }
    }

    override func bindActions() {
        viewModel.onStateChange = { [weak self] in
            self?.applyViewModel()
        }

        refreshControl.addTarget(self, action: #selector(refreshPulled), for: .valueChanged)
        editButton.addTarget(self, action: #selector(editTapped), for: .touchUpInside)
        logoutButton.addTarget(self, action: #selector(logoutTapped), for: .touchUpInside)

        accountRow.addTarget(self, action: #selector(accountSwitchTapped), for: .touchUpInside)
        passwordRow.addTarget(self, action: #selector(changePasswordTapped), for: .touchUpInside)
        withdrawalRow.addTarget(self, action: #selector(withdrawalTapped), for: .touchUpInside)
        realNameRow.addTarget(self, action: #selector(realNameTapped), for: .touchUpInside)

        nicknameField.addTarget(self, action: #selector(nicknameChanged), for: .editingChanged)

        let avatarTap = UITapGestureRecognizer(target: self, action: #selector(pickAvatar))
        avatarImageView.isUserInteractionEnabled = true
        avatarImageView.addGestureRecognizer(avatarTap)

        NotificationCenter.default.addObserver(
            self,
            selector: #selector(handleAccountDidSwitch),
            name: NotificationName.accountDidSwitch,
            object: nil
        )
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        Task { await reloadProfile(showLoading: false) }
    }

    private let headerContainer = UIView()
    private let infoCardWrapper = UIView()

    private func setupHeader() {
        avatarImageView.layer.cornerRadius = 43
        avatarImageView.clipsToBounds = true
        avatarImageView.contentMode = .scaleAspectFill

        nicknameField.font = .systemFont(ofSize: 18, weight: .medium)
        nicknameField.textColor = AppColor.text333
        nicknameField.borderStyle = .none
        nicknameField.isEnabled = false

        uidLabel.font = .systemFont(ofSize: 14, weight: .semibold)
        uidLabel.textColor = UIColor(hex: 0x9CA3AF)

        editButton.layer.cornerRadius = 18
        editButton.snp.updateConstraints { make in
            make.height.equalTo(36)
        }
        editButton.titleLabel?.font = .systemFont(ofSize: 12)

        headerContainer.addSubview(avatarImageView)
        headerContainer.addSubview(nicknameField)
        headerContainer.addSubview(uidLabel)
        headerContainer.addSubview(editButton)

        avatarImageView.snp.makeConstraints { make in
            make.leading.top.bottom.equalToSuperview()
            make.width.height.equalTo(86)
        }
        nicknameField.snp.makeConstraints { make in
            make.leading.equalTo(avatarImageView.snp.trailing).offset(16)
            make.trailing.lessThanOrEqualTo(editButton.snp.leading).offset(-8)
            make.top.equalTo(avatarImageView).offset(12)
        }
        uidLabel.snp.makeConstraints { make in
            make.leading.equalTo(nicknameField)
            make.top.equalTo(nicknameField.snp.bottom).offset(8)
        }
        editButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview()
            make.centerY.equalTo(avatarImageView)
            make.width.equalTo(80)
            make.height.equalTo(36)
        }
        headerContainer.snp.makeConstraints { make in
            make.height.greaterThanOrEqualTo(86)
        }
    }

    private func setupInfoCard() {
        infoCard.axis = .vertical
        infoCard.backgroundColor = .white
        infoCard.layer.cornerRadius = 8
        infoCard.clipsToBounds = true
        infoCard.isLayoutMarginsRelativeArrangement = true
        infoCard.layoutMargins = UIEdgeInsets(top: 0, left: 16, bottom: 0, right: 16)

        infoCardWrapper.addSubview(infoCard)
        infoCard.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }

        [
            nameRow, accountRow, phoneRow, withdrawalRow,
            passwordRow, realNameRow, statusRow, scenicRow
        ].forEach { infoCard.addArrangedSubview($0) }

        nameRow.isUserInteractionEnabled = false
        phoneRow.isUserInteractionEnabled = false
        statusRow.isUserInteractionEnabled = false
        scenicRow.isUserInteractionEnabled = false
        scenicRow.showsDivider = false
    }

    private func setupLogoutButton() {
        logoutButton.setTitle("退出登录", for: .normal)
        logoutButton.setTitleColor(UIColor(hex: 0xEF4444), for: .normal)
        logoutButton.titleLabel?.font = .systemFont(ofSize: 14)
        logoutButton.backgroundColor = .white
        logoutButton.layer.cornerRadius = 8
    }

    private func applyViewModel() {
        nicknameField.text = viewModel.isEditingProfile ? viewModel.editingNickname : viewModel.displayNickname
        nicknameField.isEnabled = viewModel.isEditingProfile
        uidLabel.text = "UID:\(viewModel.displayUID)"

        if let pendingData = viewModel.pendingAvatarData, let image = UIImage(data: pendingData) {
            avatarImageView.image = image
        } else {
            avatarImageView.loadRemoteImage(urlString: viewModel.displayAvatarURL)
        }

        editButton.setTitle(viewModel.isEditingProfile ? "完成" : "编辑", for: .normal)
        editButton.isEnabled = !viewModel.isSaving
        avatarImageView.alpha = viewModel.isEditingProfile ? 1 : 1

        nameRow.configure(value: viewModel.displayRealName)
        accountRow.configure(
            value: viewModel.accountDisplayName,
            accessory: .action("切换账号")
        )
        phoneRow.configure(value: viewModel.displayPhone)

        withdrawalRow.isHidden = !viewModel.showPhotographerFields
        realNameRow.isHidden = !viewModel.showPhotographerFields
        if viewModel.showPhotographerFields {
            configureWithdrawalRow()
            configureRealNameRow()
        }

        passwordRow.configure(value: "点击修改密码", valueColor: UIColor(hex: 0x9CA3AF), accessory: .chevron)
        statusRow.configure(
            value: viewModel.accountStatusText,
            badge: viewModel.accountStatusText == "--" ? nil : .accountActive
        )
        scenicRow.configure(
            value: viewModel.currentScenicName,
            badge: .scenic
        )

        if viewModel.isLoading, !refreshControl.isRefreshing {
            showLoading()
        } else {
            hideLoading()
        }
    }

    private func configureWithdrawalRow() {
        let info = viewModel.bankCardInfo
        let text = viewModel.bankCardDisplayText
        var valueColor = UIColor(hex: 0x9CA3AF)
        var badge: ProfileStatusBadgeView.Style?
        if let info {
            switch info.auditStatus {
            case 2:
                valueColor = AppColor.text333
            case 3:
                valueColor = UIColor(hex: 0xEF4444)
                badge = .bankRejected
            default:
                valueColor = UIColor(hex: 0xFF7B00)
                badge = .bankPending
            }
        }
        withdrawalRow.configure(
            value: text,
            valueColor: valueColor,
            accessory: .chevron,
            badge: badge
        )
        _ = info
    }

    private func configureRealNameRow() {
        if let info = viewModel.realNameInfo {
            let style: ProfileStatusBadgeView.Style
            switch info.auditStatus {
            case 2: style = .auditApproved
            case 3: style = .auditRejected
            default: style = .auditPending
            }
            realNameRow.configure(
                value: viewModel.realNameStatusText,
                accessory: .chevron,
                badge: style
            )
        } else {
            realNameRow.configure(
                value: "点击去实名认证",
                valueColor: UIColor(hex: 0x9CA3AF),
                accessory: .chevron
            )
        }
    }

    @objc private func refreshPulled() {
        Task {
            await reloadProfile(showLoading: false)
            refreshControl.endRefreshing()
        }
    }

    @objc private func handleAccountDidSwitch() {
        Task { await reloadProfile(showLoading: true) }
    }

    @objc private func nicknameChanged() {
        viewModel.updateEditingNickname(nicknameField.text ?? "")
    }

    @objc private func editTapped() {
        if viewModel.isEditingProfile {
            Task { await saveProfile() }
        } else {
            viewModel.beginEditing()
        }
    }

    @objc private func pickAvatar() {
        guard viewModel.isEditingProfile else { return }
        var configuration = PHPickerConfiguration(photoLibrary: .shared())
        configuration.filter = .images
        configuration.selectionLimit = 1
        let picker = PHPickerViewController(configuration: configuration)
        picker.delegate = self
        present(picker, animated: true)
    }

    @objc private func accountSwitchTapped() {
        navigationController?.pushViewController(AccountSwitchViewController(), animated: true)
    }

    @objc private func changePasswordTapped() {
        let alert = UIAlertController(title: "修改密码", message: "请输入新密码（至少 6 位）", preferredStyle: .alert)
        alert.addTextField { field in
            field.isSecureTextEntry = true
            field.placeholder = "新密码"
        }
        alert.addAction(UIAlertAction(title: "取消", style: .cancel))
        alert.addAction(UIAlertAction(title: "确定", style: .default) { [weak self] _ in
            guard let password = alert.textFields?.first?.text else { return }
            Task { await self?.updatePassword(password) }
        })
        present(alert, animated: true)
    }

    @objc private func withdrawalTapped() {
        if let bankCard = viewModel.bankCardInfo, bankCard.auditStatus != 0 {
            navigationController?.pushViewController(
                WithdrawalSettingsAuditViewController(bankCard: bankCard),
                animated: true
            )
            return
        }
        if viewModel.realNameInfo?.verified != true {
            showToast("请实名认证成功后再试")
            return
        }
        navigationController?.pushViewController(WithdrawalSettingsViewController(), animated: true)
    }

    @objc private func realNameTapped() {
        if viewModel.realNameInfo == nil {
            navigationController?.pushViewController(RealNameAuthViewController(), animated: true)
        } else if let info = viewModel.realNameInfo {
            navigationController?.pushViewController(
                RealNameAuthAuditViewController(info: info),
                animated: true
            )
        }
    }

    @objc private func logoutTapped() {
        let alert = UIAlertController(title: "确定退出登录？", message: "退出后将需要重新登录", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "取消", style: .cancel))
        alert.addAction(UIAlertAction(title: "确定", style: .destructive) { _ in
            NotificationCenter.default.post(name: NotificationName.userDidLogout, object: nil)
        })
        present(alert, animated: true)
    }

    private func reloadProfile(showLoading: Bool) async {
        if showLoading { self.showLoading() }
        defer {
            if showLoading { hideLoading() }
        }
        do {
            try await viewModel.reload(api: profileAPI)
        } catch {
            showToast(error.localizedDescription)
        }
    }

    private func saveProfile() async {
        let scenicId = AppStore.shared.currentScenicId
        guard scenicId > 0 else {
            showToast("当前景区信息缺失")
            return
        }
        showLoading()
        defer { hideLoading() }
        do {
            try await viewModel.saveProfile(
                api: profileAPI,
                uploader: ossUploadService,
                scenicId: scenicId
            )
            showToast("保存成功")
        } catch {
            showToast(error.localizedDescription)
        }
    }

    private func updatePassword(_ password: String) async {
        showLoading()
        defer { hideLoading() }
        do {
            try await viewModel.updatePassword(password, api: profileAPI)
            showToast("密码修改成功")
        } catch {
            showToast(error.localizedDescription)
        }
    }
}

extension ProfileViewController: PHPickerViewControllerDelegate {
    func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
        picker.dismiss(animated: true)
        guard let provider = results.first?.itemProvider, provider.canLoadObject(ofClass: UIImage.self) else { return }
        provider.loadObject(ofClass: UIImage.self) { [weak self] object, _ in
            guard let self, let image = object as? UIImage, let data = image.jpegData(compressionQuality: 0.9) else { return }
            Task { @MainActor in
                do {
                    try self.viewModel.prepareAvatarImage(data: data)
                } catch {
                    self.showToast(error.localizedDescription)
                }
            }
        }
    }
}