//
//  PhotographerInviteViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 摄影师邀请页面，展示邀请二维码、邀请码、收益规则、新人福利和分享入口。
final class PhotographerInviteViewController: BaseViewController {
    private let viewModel = PhotographerInviteViewModel()
    private let inviteAPI: InviteServing

    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let qrCard = UIView()
    private let qrImageView = UIImageView()
    private let inviteCodeLabel = UILabel()
    private let ruleStack = UIStackView()

    /// 初始化摄影师邀请页面。
    init(inviteAPI: InviteServing = NetworkServices.shared.inviteAPI) {
        self.inviteAPI = inviteAPI
        super.init(nibName: nil, bundle: nil)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func setupNavigationBar() {
        title = "摄影师邀请"
    }

    override func setupUI() {
        view.backgroundColor = UIColor(hex: 0xF5F6F8)
        scrollView.alwaysBounceVertical = true
        scrollView.refreshControl = UIRefreshControl()
        contentStack.axis = .vertical
        contentStack.spacing = 16

        view.addSubview(scrollView)
        scrollView.addSubview(contentStack)

        contentStack.addArrangedSubview(makeInviteCard())
        contentStack.addArrangedSubview(makeRuleCard())
        contentStack.addArrangedSubview(makeBenefitCard())
        contentStack.addArrangedSubview(makeInviteRecordEntry())
    }

    override func setupConstraints() {
        scrollView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        contentStack.snp.makeConstraints { make in
            make.top.bottom.equalTo(scrollView.contentLayoutGuide).inset(16)
            make.leading.trailing.equalTo(scrollView.frameLayoutGuide).inset(16)
            make.width.equalTo(scrollView.frameLayoutGuide).offset(-32)
        }
    }

    override func bindActions() {
        scrollView.refreshControl?.addTarget(self, action: #selector(refreshPulled), for: .valueChanged)
        viewModel.onStateChange = { [weak self] in
            Task { @MainActor in
                self?.applyViewModel()
            }
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        Task { await viewModel.reload(api: inviteAPI) }
    }

    private func makeInviteCard() -> UIView {
        qrCard.backgroundColor = .white
        qrCard.layer.cornerRadius = 12
        qrCard.clipsToBounds = true

        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 16
        stack.alignment = .fill
        qrCard.addSubview(stack)

        qrImageView.contentMode = .scaleAspectFit
        qrImageView.backgroundColor = .white
        qrImageView.image = UIImage(systemName: "qrcode")
        qrImageView.tintColor = AppColor.textTertiary
        stack.addArrangedSubview(qrImageView)

        let codeRow = UIStackView()
        codeRow.axis = .horizontal
        codeRow.alignment = .center
        codeRow.spacing = 8

        inviteCodeLabel.font = .systemFont(ofSize: 16)
        inviteCodeLabel.textColor = UIColor(hex: 0x4B5563)
        inviteCodeLabel.numberOfLines = 1
        codeRow.addArrangedSubview(inviteCodeLabel)

        let copyButton = UIButton(type: .system)
        copyButton.setTitle("复制", for: .normal)
        copyButton.setTitleColor(.white, for: .normal)
        copyButton.titleLabel?.font = .systemFont(ofSize: 14, weight: .medium)
        copyButton.backgroundColor = AppColor.primary
        copyButton.layer.cornerRadius = 6
        copyButton.addTarget(self, action: #selector(copyCodeTapped), for: .touchUpInside)
        codeRow.addArrangedSubview(copyButton)
        copyButton.snp.makeConstraints { make in
            make.width.equalTo(64)
            make.height.equalTo(28)
        }
        stack.addArrangedSubview(codeRow)

        let actionRow = UIStackView()
        actionRow.axis = .horizontal
        actionRow.spacing = 12
        actionRow.distribution = .fillEqually
        let shareButton = InviteIconButton(title: "分享", imageName: "ic_invite_share", backgroundColor: UIColor(hex: 0x07C160))
        shareButton.addTarget(self, action: #selector(shareTapped), for: .touchUpInside)
        let linkButton = InviteIconButton(title: "复制链接", imageName: "ic_invite_link", backgroundColor: AppColor.primary)
        linkButton.addTarget(self, action: #selector(copyLinkTapped), for: .touchUpInside)
        actionRow.addArrangedSubview(shareButton)
        actionRow.addArrangedSubview(linkButton)
        stack.addArrangedSubview(actionRow)
        actionRow.snp.makeConstraints { make in
            make.height.equalTo(44)
        }

        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16)
        }
        qrImageView.snp.makeConstraints { make in
            make.height.equalTo(280)
        }

        return qrCard
    }

    private func makeRuleCard() -> UIView {
        let card = UIView()
        card.backgroundColor = .white
        card.layer.cornerRadius = 12
        card.layer.borderWidth = 1
        card.layer.borderColor = AppColor.cardOutline.cgColor

        let titleLabel = UILabel()
        titleLabel.text = "收益规则"
        titleLabel.font = .systemFont(ofSize: 18, weight: .medium)
        titleLabel.textColor = .black

        ruleStack.axis = .vertical
        ruleStack.spacing = 12

        let stack = UIStackView(arrangedSubviews: [titleLabel, ruleStack])
        stack.axis = .vertical
        stack.spacing = 12
        card.addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16)
        }
        return card
    }

    private func makeBenefitCard() -> UIView {
        let card = UIView()
        card.backgroundColor = .white
        card.layer.cornerRadius = 12
        card.clipsToBounds = true

        let titleLabel = UILabel()
        titleLabel.text = "新人福利"
        titleLabel.font = .systemFont(ofSize: 18, weight: .medium)
        titleLabel.textColor = .black

        let grid = UIStackView()
        grid.axis = .vertical
        grid.spacing = 12

        let benefits: [(String, String)] = [
            ("免费剪辑修图", "ic_invite_benefit_free_editing"),
            ("免费云盘相册", "ic_invite_benefit_free_cloud"),
            ("免费线上流量", "ic_free_traffic"),
            ("景区运营身份", "ic_scenic_identity"),
            ("接单软件工具", "ic_order_tools"),
            ("免佣金特权", "ic_no_commission"),
        ]
        for index in stride(from: 0, to: benefits.count, by: 2) {
            let row = UIStackView()
            row.axis = .horizontal
            row.spacing = 12
            row.distribution = .fillEqually
            row.addArrangedSubview(InviteBenefitView(title: benefits[index].0, imageName: benefits[index].1))
            row.addArrangedSubview(InviteBenefitView(title: benefits[index + 1].0, imageName: benefits[index + 1].1))
            grid.addArrangedSubview(row)
        }

        let validityStack = UIStackView()
        validityStack.axis = .vertical
        validityStack.spacing = 8
        ["活动有效期: 2026年9月1日", "佣金有效期: 2028年1月1日"].forEach { text in
            let label = UILabel()
            label.text = text
            label.font = .app(.body)
            label.textColor = UIColor(hex: 0x7B8EAA)
            validityStack.addArrangedSubview(label)
        }

        let stack = UIStackView(arrangedSubviews: [titleLabel, grid, validityStack])
        stack.axis = .vertical
        stack.spacing = 16
        card.addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16)
        }
        return card
    }

    private func makeInviteRecordEntry() -> UIView {
        let container = UIView()
        container.backgroundColor = UIColor(hex: 0xF5F6F8)
        container.snp.makeConstraints { make in
            make.height.equalTo(64)
        }

        let button = UIButton(type: .system)
        button.backgroundColor = .white
        button.layer.cornerRadius = 8
        button.setTitle("邀请记录", for: .normal)
        button.setTitleColor(AppColor.primary, for: .normal)
        button.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        button.setImage(UIImage(named: "ic_invite_record")?.withRenderingMode(.alwaysTemplate), for: .normal)
        button.tintColor = AppColor.primary
        button.imageEdgeInsets = UIEdgeInsets(top: 0, left: -6, bottom: 0, right: 6)
        button.addTarget(self, action: #selector(inviteRecordTapped), for: .touchUpInside)
        container.addSubview(button)
        button.snp.makeConstraints { make in
            make.leading.trailing.equalToSuperview()
            make.top.equalToSuperview().offset(16)
            make.height.equalTo(48)
        }
        return container
    }

    @MainActor
    private func applyViewModel() {
        if viewModel.isLoading {
            showLoading()
        } else {
            hideLoading()
            scrollView.refreshControl?.endRefreshing()
        }

        if let qrImage = viewModel.qrImage {
            qrImageView.image = qrImage
        }

        let attributed = NSMutableAttributedString(
            string: "邀请码: ",
            attributes: [.foregroundColor: UIColor(hex: 0x4B5563)]
        )
        attributed.append(
            NSAttributedString(
                string: viewModel.inviteCode.isEmpty ? "--" : viewModel.inviteCode,
                attributes: [.foregroundColor: AppColor.primary]
            )
        )
        inviteCodeLabel.attributedText = attributed
        applyRules()

        if let message = viewModel.errorMessage {
            showToast("获取邀请信息失败: \(message)")
        }
    }

    private func applyRules() {
        ruleStack.arrangedSubviews.forEach { view in
            ruleStack.removeArrangedSubview(view)
            view.removeFromSuperview()
        }
        viewModel.rules.enumerated().forEach { index, rule in
            ruleStack.addArrangedSubview(InviteRuleRow(rule: rule, imageName: index.isMultiple(of: 2) ? "ic_invite_earnings" : "ic_user_benefits"))
        }
    }

    @objc private func refreshPulled() {
        Task { await viewModel.reload(api: inviteAPI) }
    }

    @objc private func copyCodeTapped() {
        guard !viewModel.inviteCodeForCopy().isEmpty else {
            showToast("邀请码加载中，请稍后重试")
            return
        }
        UIPasteboard.general.string = viewModel.inviteCodeForCopy()
        showToast("已复制成功")
    }

    @objc private func copyLinkTapped() {
        guard !viewModel.inviteUrlForCopy().isEmpty else {
            showToast("邀请链接加载中，请稍后重试")
            return
        }
        UIPasteboard.general.string = viewModel.inviteUrlForCopy()
        showToast("已复制成功")
    }

    @objc private func shareTapped() {
        guard !viewModel.inviteUrl.isEmpty else {
            showToast("邀请链接加载中，请稍后重试")
            return
        }

        let payload = WeChatWebPageSharePayload(
            title: "邀请你加入随心瞰商家版",
            description: viewModel.inviteCode.isEmpty ? "摄影师邀请" : "邀请码：\(viewModel.inviteCode)",
            url: viewModel.inviteUrl
        )
        WeChatShareService.shareWebPage(payload, scene: .session, thumbImage: viewModel.qrImage ?? WeChatShareService.defaultThumbImage()) { [weak self] result in
            Task { @MainActor in
                self?.handleShareResult(result)
            }
        }
    }

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

    private func handleShareResult(_ result: WeChatShareResult) {
        switch result {
        case .success:
            showToast("已分享到微信好友")
        case .cancelled:
            showToast("已取消分享")
        case .notInstalled:
            showToast("未安装微信，无法分享")
        case .unsupported:
            showToast("当前微信版本不支持分享")
        case .invalidPayload(let message):
            showToast(message)
        case .sendFailed, .unknown:
            showToast("分享失败，请稍后重试")
        }
    }
}

/// 邀请页带图标按钮。
private final class InviteIconButton: UIButton {
    /// 初始化带图标按钮。
    init(title: String, imageName: String, backgroundColor: UIColor) {
        super.init(frame: .zero)
        self.backgroundColor = backgroundColor
        layer.cornerRadius = 8
        setTitle(title, for: .normal)
        setTitleColor(.white, for: .normal)
        setImage(UIImage(named: imageName)?.withRenderingMode(.alwaysTemplate), for: .normal)
        tintColor = .white
        titleLabel?.font = .systemFont(ofSize: 14, weight: .medium)
        imageEdgeInsets = UIEdgeInsets(top: 0, left: -3, bottom: 0, right: 3)
        titleEdgeInsets = UIEdgeInsets(top: 0, left: 3, bottom: 0, right: -3)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

/// 收益规则展示行。
private final class InviteRuleRow: UIView {
    /// 初始化收益规则展示行。
    init(rule: String, imageName: String) {
        super.init(frame: .zero)

        let iconView = UIImageView(image: UIImage(named: imageName)?.withRenderingMode(.alwaysTemplate))
        iconView.tintColor = AppColor.primary
        iconView.contentMode = .scaleAspectFit

        let label = UILabel()
        label.text = rule
        label.font = .app(.body)
        label.textColor = .black
        label.numberOfLines = 0

        addSubview(iconView)
        addSubview(label)
        iconView.snp.makeConstraints { make in
            make.leading.equalToSuperview()
            make.top.equalToSuperview().offset(2)
            make.size.equalTo(16)
        }
        label.snp.makeConstraints { make in
            make.top.bottom.trailing.equalToSuperview()
            make.leading.equalTo(iconView.snp.trailing).offset(12)
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

/// 新人福利卡片。
private final class InviteBenefitView: UIView {
    /// 初始化新人福利卡片。
    init(title: String, imageName: String) {
        super.init(frame: .zero)
        backgroundColor = UIColor(hex: 0xEFF6FF)
        layer.cornerRadius = 12

        let iconView = UIImageView(image: UIImage(named: imageName)?.withRenderingMode(.alwaysTemplate))
        iconView.tintColor = AppColor.primary
        iconView.contentMode = .scaleAspectFit

        let titleLabel = UILabel()
        titleLabel.text = title
        titleLabel.font = .app(.body)
        titleLabel.textColor = .black
        titleLabel.textAlignment = .center
        titleLabel.numberOfLines = 2

        addSubview(iconView)
        addSubview(titleLabel)
        snp.makeConstraints { make in
            make.height.equalTo(80)
        }
        iconView.snp.makeConstraints { make in
            make.centerX.equalToSuperview()
            make.top.equalToSuperview().offset(12)
            make.size.equalTo(24)
        }
        titleLabel.snp.makeConstraints { make in
            make.leading.trailing.equalToSuperview().inset(8)
            make.top.equalTo(iconView.snp.bottom).offset(8)
            make.bottom.lessThanOrEqualToSuperview().inset(8)
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}