//
//  WildPhotographerReportHomeViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 举报摄影师首页，提供立即举报、我的举报、风险地图和规则入口。
final class WildPhotographerReportHomeViewController: BaseViewController {
    private let viewModel: WildPhotographerReportHomeViewModel
    private let api: any WildPhotographerReportServing
    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()

    init(
        viewModel: WildPhotographerReportHomeViewModel = WildPhotographerReportHomeViewModel(),
        api: any WildPhotographerReportServing = NetworkServices.shared.wildPhotographerReportAPI
    ) {
        self.viewModel = viewModel
        self.api = api
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = "举报摄影师"
        navigationItem.largeTitleDisplayMode = .never
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackgroundSoft
        scrollView.alwaysBounceVertical = true
        scrollView.showsVerticalScrollIndicator = false
        scrollView.contentInsetAdjustmentBehavior = .never
        contentStack.axis = .vertical
        contentStack.spacing = 14
        view.addSubview(scrollView)
        scrollView.addSubview(contentStack)
        rebuildContent()
    }

    override func setupConstraints() {
        scrollView.snp.makeConstraints { make in
            make.top.leading.trailing.equalTo(view.safeAreaLayoutGuide)
            make.bottom.equalToSuperview()
        }
        contentStack.snp.makeConstraints { make in
            make.edges.equalTo(scrollView.contentLayoutGuide).inset(UIEdgeInsets(top: AppSpacing.md, left: 20, bottom: AppSpacing.md, right: 20))
            make.width.equalTo(scrollView.frameLayoutGuide).offset(-40)
        }
    }

    override func bindActions() {
        viewModel.onStateChange = { [weak self] in
            Task { @MainActor in self?.rebuildContent() }
        }
        viewModel.onShowMessage = { [weak self] message in
            Task { @MainActor in self?.showToast(message) }
        }
    }

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

    @MainActor
    private func rebuildContent() {
        contentStack.arrangedSubviews.forEach { view in
            contentStack.removeArrangedSubview(view)
            view.removeFromSuperview()
        }

        switch viewModel.pageState {
        case .normal:
            contentStack.addArrangedSubview(makeHeroCard())
            contentStack.addArrangedSubview(makeRiskMapEntry())
            if viewModel.shouldShowNoticeModule {
                contentStack.addArrangedSubview(makeNoticeCard())
            }
            contentStack.addArrangedSubview(makeTrustCard())
        case .loading:
            contentStack.addArrangedSubview(makeStateCard(icon: "clock", title: "加载中", message: "正在加载举报服务"))
        case .empty:
            contentStack.addArrangedSubview(makeStateCard(icon: "exclamationmark.shield", title: viewModel.emptyTitle, message: viewModel.emptyMessage))
        case .error:
            contentStack.addArrangedSubview(makeStateCard(icon: "wifi.exclamationmark", title: "加载失败", message: "举报服务暂时不可用，请稍后重试。"))
        }
    }

    private func makeHeroCard() -> UIView {
        let card = WildReportCardView(spacing: 22, inset: 22)
        card.backgroundColor = UIColor(hex: 0xFBFDFF)
        card.layer.cornerRadius = 26
        card.layer.borderColor = UIColor(hex: 0xBFD7FF).cgColor

        let topRow = UIStackView()
        topRow.axis = .horizontal
        topRow.alignment = .top
        topRow.spacing = AppSpacing.md

        let titleStack = UIStackView()
        titleStack.axis = .vertical
        titleStack.spacing = 10
        let title = WildReportUI.label("实名举报", font: .systemFont(ofSize: 30, weight: .heavy), color: AppColor.textPrimary)
        let subtitle = WildReportUI.label("摄影师", font: .systemFont(ofSize: 30, weight: .heavy), color: AppColor.primary)
        titleStack.addArrangedSubview(title)
        titleStack.addArrangedSubview(subtitle)

        topRow.addArrangedSubview(titleStack)
        topRow.addArrangedSubview(UIView())
        topRow.addArrangedSubview(WildReportHeroIllustrationView())

        let desc = WildReportUI.label("可上传图片、视频、文字和位置，景区公安将接收并现场处理。", font: .systemFont(ofSize: 17, weight: .regular), color: UIColor(hex: 0x687484), lines: 0)
        desc.setContentCompressionResistancePriority(.required, for: .vertical)

        let buttonRow = UIStackView()
        buttonRow.axis = .horizontal
        buttonRow.spacing = 14
        buttonRow.distribution = .fillEqually

        let submitButton = WildReportUI.iconButton(title: "立即举报", imageName: "checkmark.shield.fill")
        submitButton.titleLabel?.font = .systemFont(ofSize: 18, weight: .bold)
        submitButton.layer.cornerRadius = 14
        submitButton.addTarget(self, action: #selector(submitTapped), for: .touchUpInside)
        let listButton = WildReportUI.iconButton(title: "我的举报", imageName: "doc.text.fill", style: .secondary)
        listButton.titleLabel?.font = .systemFont(ofSize: 18, weight: .bold)
        listButton.layer.cornerRadius = 14
        listButton.backgroundColor = .white
        listButton.layer.borderWidth = 1
        listButton.layer.borderColor = UIColor(hex: 0xBFD7FF).cgColor
        listButton.addTarget(self, action: #selector(listTapped), for: .touchUpInside)
        [submitButton, listButton].forEach { button in
            button.snp.makeConstraints { make in make.height.equalTo(58) }
            buttonRow.addArrangedSubview(button)
        }

        card.stack.addArrangedSubview(topRow)
        card.stack.addArrangedSubview(desc)
        card.stack.addArrangedSubview(buttonRow)
        return card
    }

    private func makeRiskMapEntry() -> UIView {
        let card = WildReportCardView(spacing: 0, inset: 18)
        card.layer.cornerRadius = 20
        let row = makeEntryRow(icon: "map.fill", title: "附近风险地图", subtitle: "查看附近摄影师风险点位")
        let button = UIButton(type: .system)
        button.addTarget(self, action: #selector(mapTapped), for: .touchUpInside)
        card.stack.addArrangedSubview(row)
        card.addSubview(button)
        button.snp.makeConstraints { make in make.edges.equalToSuperview() }
        return card
    }

    private func makeNoticeCard() -> UIView {
        let card = WildReportCardView(spacing: 18, inset: 18)
        card.layer.cornerRadius = 20
        let header = UIStackView()
        header.axis = .horizontal
        header.alignment = .center
        header.spacing = AppSpacing.sm
        let headerIcon = UIImageView(image: UIImage(systemName: "list.clipboard.fill"))
        headerIcon.tintColor = AppColor.primary
        headerIcon.snp.makeConstraints { make in make.size.equalTo(24) }
        let title = WildReportUI.label("举报须知", font: .systemFont(ofSize: 18, weight: .bold), color: AppColor.textPrimary)
        header.addArrangedSubview(headerIcon)
        header.addArrangedSubview(title)
        header.addArrangedSubview(UIView())
        if viewModel.shouldShowRuleButton {
            let ruleButton = UIButton(type: .system)
            ruleButton.setTitle("举报规则", for: .normal)
            ruleButton.setImage(UIImage(systemName: "shield.lefthalf.filled"), for: .normal)
            ruleButton.titleLabel?.font = .systemFont(ofSize: 15, weight: .bold)
            ruleButton.tintColor = AppColor.primary
            ruleButton.setTitleColor(AppColor.primary, for: .normal)
            ruleButton.backgroundColor = AppColor.primaryLight
            ruleButton.layer.cornerRadius = 18
            ruleButton.setConfigurationContentInsets(
                NSDirectionalEdgeInsets(top: 0, leading: 12, bottom: 0, trailing: 12)
            )
            ruleButton.addTarget(self, action: #selector(ruleTapped), for: .touchUpInside)
            ruleButton.snp.makeConstraints { make in
                make.height.equalTo(36)
            }
            header.addArrangedSubview(ruleButton)
        }

        card.stack.addArrangedSubview(header)
        viewModel.noticeItems.forEach { item in
            card.stack.addArrangedSubview(makeBullet(item))
        }
        return card
    }

    private func makeTrustCard() -> UIView {
        let badges = UIStackView()
        badges.axis = .horizontal
        badges.distribution = .fillEqually
        badges.spacing = AppSpacing.xs
        [
            ("实名", "身份核验 真实可靠", "person.crop.circle.badge.checkmark", AppColor.primary, AppColor.primaryLight),
            ("安全", "数据加密 隐私保护", "checkmark.shield.fill", AppColor.success, AppColor.successBackground),
            ("景区公安处理", "专业受理 依法处置", "person.text.rectangle.fill", AppColor.primary, AppColor.primaryLight)
        ].forEach { title, subtitle, icon, tint, bg in
            badges.addArrangedSubview(WildReportTrustItemView(title: title, subtitle: subtitle, iconName: icon, tintColor: tint, backgroundColor: bg))
        }
        return badges
    }

    private func makeEntryRow(icon: String, title: String, subtitle: String) -> UIView {
        let row = UIStackView()
        row.axis = .horizontal
        row.alignment = .center
        row.spacing = 18
        let iconWrap = UIView()
        iconWrap.backgroundColor = AppColor.primaryLight
        iconWrap.layer.cornerRadius = 18
        let image = UIImageView(image: UIImage(systemName: icon))
        image.tintColor = AppColor.primary
        iconWrap.addSubview(image)
        image.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(34)
        }
        iconWrap.snp.makeConstraints { make in make.size.equalTo(64) }

        let textStack = UIStackView()
        textStack.axis = .vertical
        textStack.spacing = 6
        textStack.addArrangedSubview(WildReportUI.label(title, font: .systemFont(ofSize: 19, weight: .bold), color: AppColor.textPrimary))
        textStack.addArrangedSubview(WildReportUI.label(subtitle, font: .systemFont(ofSize: 15, weight: .regular), color: AppColor.textSecondary))

        let chevron = UIImageView(image: UIImage(systemName: "chevron.right"))
        chevron.tintColor = AppColor.textTertiary
        row.addArrangedSubview(iconWrap)
        row.addArrangedSubview(textStack)
        row.addArrangedSubview(UIView())
        row.addArrangedSubview(chevron)
        return row
    }

    private func makeBullet(_ text: String) -> UIView {
        let row = UIStackView()
        row.axis = .horizontal
        row.alignment = .center
        row.spacing = 14
        let dot = UIView()
        dot.backgroundColor = AppColor.primary
        dot.layer.cornerRadius = 4
        dot.snp.makeConstraints { make in
            make.size.equalTo(8)
        }
        let label = WildReportUI.label(text, font: .systemFont(ofSize: 16, weight: .regular), color: UIColor(hex: 0x667085), lines: 0)
        row.addArrangedSubview(dot)
        row.addArrangedSubview(label)
        return row
    }

    private func makeStateCard(
        icon: String,
        title: String,
        message: String,
        buttonTitle: String? = nil,
        action: (() -> Void)? = nil
    ) -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.md)
        card.stack.alignment = .center
        let image = UIImageView(image: UIImage(systemName: icon))
        image.tintColor = AppColor.primary
        image.snp.makeConstraints { make in make.size.equalTo(48) }
        let titleLabel = WildReportUI.label(title, font: .app(.metric), color: AppColor.textPrimary)
        let messageLabel = WildReportUI.label(message, font: .app(.body), color: AppColor.textSecondary, lines: 0)
        messageLabel.textAlignment = .center
        card.stack.addArrangedSubview(image)
        card.stack.addArrangedSubview(titleLabel)
        card.stack.addArrangedSubview(messageLabel)
        if let buttonTitle {
            let button = AppButton(title: buttonTitle)
            button.addAction(UIAction { _ in action?() }, for: .touchUpInside)
            card.stack.addArrangedSubview(button)
            button.snp.makeConstraints { make in make.width.equalTo(180) }
        }
        return card
    }

    @objc private func submitTapped() {
        navigationController?.pushViewController(
            WildPhotographerReportSubmitViewController(homeViewModel: viewModel),
            animated: true
        )
    }

    @objc private func listTapped() {
        navigationController?.pushViewController(
            WildPhotographerReportListViewController(homeViewModel: viewModel),
            animated: true
        )
    }

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

    @objc private func ruleTapped() {
        navigationController?.pushViewController(WildReportRuleViewController(ruleGroups: viewModel.ruleGroups), animated: true)
    }
}

/// 首页 Hero 插画，复刻参考页右上角安全盾牌与相机角标。
private final class WildReportHeroIllustrationView: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        let ring = UIView()
        ring.backgroundColor = UIColor(hex: 0xD9EAFF)
        ring.layer.cornerRadius = 58

        let center = UIView()
        center.backgroundColor = .white
        center.layer.cornerRadius = 28
        center.layer.shadowColor = UIColor.black.cgColor
        center.layer.shadowOpacity = 0.04
        center.layer.shadowRadius = 10
        center.layer.shadowOffset = CGSize(width: 0, height: 4)

        let shield = UIImageView(image: UIImage(systemName: "exclamationmark.shield.fill"))
        shield.tintColor = AppColor.primary
        shield.contentMode = .scaleAspectFit

        let cameraBadge = UIView()
        cameraBadge.backgroundColor = UIColor(hex: 0xE8F3FF)
        cameraBadge.layer.cornerRadius = 14
        let camera = UIImageView(image: UIImage(systemName: "camera.fill"))
        camera.tintColor = UIColor(hex: 0x195591)
        camera.contentMode = .scaleAspectFit

        addSubview(ring)
        addSubview(center)
        center.addSubview(shield)
        addSubview(cameraBadge)
        cameraBadge.addSubview(camera)

        ring.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(116)
        }
        center.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(88)
        }
        shield.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(52)
        }
        cameraBadge.snp.makeConstraints { make in
            make.trailing.equalToSuperview().offset(-8)
            make.bottom.equalToSuperview().offset(-10)
            make.size.equalTo(38)
        }
        camera.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(22)
        }
        snp.makeConstraints { make in
            make.size.equalTo(116)
        }
    }

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

/// 首页底部信任说明小卡。
private final class WildReportTrustItemView: UIView {
    init(title: String, subtitle: String, iconName: String, tintColor: UIColor, backgroundColor: UIColor) {
        super.init(frame: .zero)
        self.backgroundColor = .white
        layer.cornerRadius = 16
        layer.borderWidth = 1
        layer.borderColor = AppColor.cardOutline.cgColor

        let iconWrap = UIView()
        iconWrap.backgroundColor = backgroundColor
        iconWrap.layer.cornerRadius = 22
        let icon = UIImageView(image: UIImage(systemName: iconName))
        icon.tintColor = tintColor
        icon.contentMode = .scaleAspectFit
        iconWrap.addSubview(icon)
        icon.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.size.equalTo(26)
        }

        let titleLabel = WildReportUI.label(title, font: .systemFont(ofSize: 16, weight: .bold), color: AppColor.textPrimary)
        titleLabel.textAlignment = .center
        titleLabel.adjustsFontSizeToFitWidth = true
        titleLabel.minimumScaleFactor = 0.78
        titleLabel.lineBreakMode = .byClipping
        titleLabel.setContentCompressionResistancePriority(.required, for: .vertical)

        let subtitleLabel = WildReportUI.label(subtitle, font: .systemFont(ofSize: 12, weight: .regular), color: AppColor.textSecondary)
        subtitleLabel.textAlignment = .center
        subtitleLabel.adjustsFontSizeToFitWidth = true
        subtitleLabel.minimumScaleFactor = 0.74
        subtitleLabel.lineBreakMode = .byClipping
        subtitleLabel.setContentCompressionResistancePriority(.required, for: .vertical)

        addSubview(iconWrap)
        addSubview(titleLabel)
        addSubview(subtitleLabel)
        iconWrap.snp.makeConstraints { make in
            make.top.equalToSuperview().offset(14)
            make.centerX.equalToSuperview()
            make.size.equalTo(44)
        }
        titleLabel.snp.makeConstraints { make in
            make.top.equalTo(iconWrap.snp.bottom).offset(8)
            make.leading.trailing.equalToSuperview().inset(6)
            make.height.equalTo(20)
        }
        subtitleLabel.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(4)
            make.leading.trailing.equalToSuperview().inset(6)
            make.height.equalTo(16)
        }
        snp.makeConstraints { make in
            make.height.equalTo(118)
        }
    }

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

/// 举报规则页面。
final class WildReportRuleViewController: BaseViewController {
    private let scrollView = UIScrollView()
    private let stack = UIStackView()
    private let ruleGroups: [WildReportRuleGroup]

    init(ruleGroups: [WildReportRuleGroup]) {
        self.ruleGroups = ruleGroups
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = "举报规则"
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackgroundSoft
        scrollView.alwaysBounceVertical = true
        scrollView.showsVerticalScrollIndicator = false
        stack.axis = .vertical
        stack.spacing = AppSpacing.sm
        view.addSubview(scrollView)
        scrollView.addSubview(stack)
        ruleGroups.forEach { group in
            addSection(title: group.title, items: group.items)
        }
    }

    override func setupConstraints() {
        scrollView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        stack.snp.makeConstraints { make in
            make.edges.equalTo(scrollView.contentLayoutGuide).inset(AppSpacing.md)
            make.width.equalTo(scrollView.frameLayoutGuide).offset(-AppSpacing.md * 2)
        }
    }

    private func addSection(title: String, items: [String]) {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        if !title.isEmpty {
            card.stack.addArrangedSubview(WildReportUI.label(title, font: .app(.title), color: AppColor.textPrimary))
        }
        items.forEach { item in
            card.stack.addArrangedSubview(WildReportUI.label("· \(item)", font: .app(.body), color: AppColor.textSecondary, lines: 0))
        }
        stack.addArrangedSubview(card)
    }
}