//
//  WildPhotographerReportSubmitViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 提交举报页面，提供类型、证据、说明、定位和联系方式表单。
final class WildPhotographerReportSubmitViewController: BaseViewController {
    private let viewModel: WildPhotographerReportSubmitViewModel
    private let homeViewModel: WildPhotographerReportHomeViewModel
    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let descriptionView = UITextView()
    private let contactField = UITextField()
    private let submitButton = AppButton(title: "提交举报")

    init(
        homeViewModel: WildPhotographerReportHomeViewModel,
        locationProvider: any LocationProviding = LocationProvider.shared
    ) {
        self.homeViewModel = homeViewModel
        self.viewModel = WildPhotographerReportSubmitViewModel(
            homeViewModel: homeViewModel,
            locationProvider: locationProvider
        )
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = "提交举报"
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackgroundSoft
        scrollView.keyboardDismissMode = .interactive
        contentStack.axis = .vertical
        contentStack.spacing = AppSpacing.sm

        descriptionView.font = .app(.body)
        descriptionView.textColor = AppColor.textPrimary
        descriptionView.backgroundColor = AppColor.inputBackground
        descriptionView.layer.cornerRadius = AppRadius.md
        descriptionView.textContainerInset = UIEdgeInsets(top: 12, left: 10, bottom: 12, right: 10)
        descriptionView.delegate = self

        contactField.placeholder = "微信号或手机号（选填）"
        contactField.font = .app(.body)
        contactField.textColor = AppColor.textPrimary
        contactField.backgroundColor = AppColor.inputBackground
        contactField.layer.cornerRadius = AppRadius.md
        contactField.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 12, height: 1))
        contactField.leftViewMode = .always
        contactField.addTarget(self, action: #selector(contactChanged), for: .editingChanged)

        submitButton.addTarget(self, action: #selector(submitTapped), for: .touchUpInside)

        view.addSubview(scrollView)
        scrollView.addSubview(contentStack)
        view.addSubview(submitButton)
        rebuildContent()
    }

    override func setupConstraints() {
        submitButton.snp.makeConstraints { make in
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
            make.bottom.equalTo(view.safeAreaLayoutGuide).inset(AppSpacing.sm)
        }
        scrollView.snp.makeConstraints { make in
            make.top.leading.trailing.equalTo(view.safeAreaLayoutGuide)
            make.bottom.equalTo(submitButton.snp.top).offset(-AppSpacing.sm)
        }
        contentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: AppSpacing.sm, left: AppSpacing.md, bottom: AppSpacing.lg, right: AppSpacing.md))
            make.width.equalTo(scrollView.snp.width).offset(-AppSpacing.md * 2)
        }
    }

    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) }
        }
        viewModel.onSubmitSuccess = { [weak self] result in
            Task { @MainActor in
                guard let self else { return }
                self.navigationController?.pushViewController(
                    WildPhotographerReportSuccessViewController(
                        result: result,
                        homeViewModel: self.homeViewModel
                    ),
                    animated: true
                )
            }
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        viewModel.loadInitialLocationIfNeeded()
    }

    @MainActor
    private func rebuildContent() {
        contentStack.arrangedSubviews.forEach { view in
            contentStack.removeArrangedSubview(view)
            view.removeFromSuperview()
        }
        contentStack.addArrangedSubview(makeTipsCard())
        contentStack.addArrangedSubview(makeTypeCard())
        contentStack.addArrangedSubview(makeEvidenceCard())
        contentStack.addArrangedSubview(makeDescriptionCard())
        contentStack.addArrangedSubview(makeLocationCard())
        contentStack.addArrangedSubview(makeContactCard())
        contentStack.addArrangedSubview(makePaymentCard())
    }

    private func makeTipsCard() -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.xs)
        card.stack.addArrangedSubview(WildReportUI.label("实名登录后提交，景区公安将接收并处理", font: .app(.bodyMedium), color: AppColor.textPrimary, lines: 0))
        card.stack.addArrangedSubview(WildReportUI.label("请描述摄影师位置、外貌特征和具体行为。", font: .app(.caption), color: AppColor.textSecondary, lines: 0))
        return card
    }

    private func makeTypeCard() -> UIView {
        let card = sectionCard(index: 1, title: "选择举报类型")
        let row = UIStackView()
        row.axis = .vertical
        row.spacing = AppSpacing.xs
        WildReportType.allCases.forEach { type in
            let button = UIButton(type: .system)
            button.contentHorizontalAlignment = .left
            button.titleLabel?.font = .app(.bodyMedium)
            button.setTitle("  \(type.rawValue)", for: .normal)
            button.setImage(UIImage(systemName: type == viewModel.selectedReportType ? "largecircle.fill.circle" : "circle"), for: .normal)
            button.tintColor = AppColor.primary
            button.setTitleColor(AppColor.textPrimary, for: .normal)
            button.addAction(UIAction { [weak self] _ in self?.viewModel.selectReportType(type) }, for: .touchUpInside)
            button.snp.makeConstraints { make in make.height.equalTo(38) }
            row.addArrangedSubview(button)
        }
        card.stack.addArrangedSubview(row)
        return card
    }

    private func makeEvidenceCard() -> UIView {
        let card = sectionCard(index: 2, title: "上传现场证据")
        let buttonRow = UIStackView()
        buttonRow.axis = .horizontal
        buttonRow.spacing = AppSpacing.sm
        buttonRow.distribution = .fillEqually
        let imageButton = WildReportUI.iconButton(title: "添加图片", imageName: "photo", style: .secondary)
        imageButton.addTarget(self, action: #selector(addImageTapped), for: .touchUpInside)
        let videoButton = WildReportUI.iconButton(title: "添加视频", imageName: "video", style: .secondary)
        videoButton.addTarget(self, action: #selector(addVideoTapped), for: .touchUpInside)
        [imageButton, videoButton].forEach { button in
            button.snp.makeConstraints { make in make.height.equalTo(44) }
            buttonRow.addArrangedSubview(button)
        }
        card.stack.addArrangedSubview(buttonRow)
        addAttachments(viewModel.images + viewModel.videos, to: card)
        return card
    }

    private func makeDescriptionCard() -> UIView {
        let card = sectionCard(index: 3, title: "举报说明")
        descriptionView.text = viewModel.description
        card.stack.addArrangedSubview(descriptionView)
        descriptionView.snp.makeConstraints { make in
            make.height.equalTo(132)
        }
        let count = WildReportUI.label("\(viewModel.description.count)/500", font: .app(.caption), color: AppColor.textTertiary)
        count.textAlignment = .right
        card.stack.addArrangedSubview(count)
        return card
    }

    private func makeLocationCard() -> UIView {
        let card = sectionCard(index: 4, title: "举报位置")
        let title = WildReportUI.label(viewModel.locationTitleText, font: .app(.bodyMedium), color: AppColor.textPrimary, lines: 0)
        let subtitle = WildReportUI.label(viewModel.locationSubtitleText, font: .app(.caption), color: AppColor.textSecondary, lines: 0)
        let button = WildReportUI.iconButton(title: viewModel.isUpdatingLocation ? "定位中" : "更新定位", imageName: "location.fill", style: .secondary)
        button.isEnabled = !viewModel.isUpdatingLocation
        button.addTarget(self, action: #selector(refreshLocationTapped), for: .touchUpInside)
        button.snp.makeConstraints { make in make.height.equalTo(42) }
        card.stack.addArrangedSubview(title)
        card.stack.addArrangedSubview(subtitle)
        card.stack.addArrangedSubview(button)
        return card
    }

    private func makeContactCard() -> UIView {
        let card = sectionCard(index: 5, title: "联系方式（选填）")
        contactField.text = viewModel.contact
        card.stack.addArrangedSubview(contactField)
        contactField.snp.makeConstraints { make in make.height.equalTo(46) }
        return card
    }

    private func makePaymentCard() -> UIView {
        let card = sectionCard(index: 6, title: "支付截图（选填）")
        card.stack.addArrangedSubview(WildReportUI.label("上传线下微信/支付宝支付截图，最多 3 张。", font: .app(.caption), color: AppColor.textSecondary, lines: 0))
        let button = WildReportUI.iconButton(title: "添加截图", imageName: "creditcard", style: .secondary)
        button.addTarget(self, action: #selector(addPaymentTapped), for: .touchUpInside)
        button.snp.makeConstraints { make in make.height.equalTo(42) }
        card.stack.addArrangedSubview(button)
        addAttachments(viewModel.paymentImages, to: card)
        return card
    }

    private func sectionCard(index: Int, title: String) -> WildReportCardView {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        card.stack.addArrangedSubview(WildReportUI.label("\(index). \(title)", font: .app(.title), color: AppColor.textPrimary))
        return card
    }

    private func addAttachments(_ attachments: [WildReportAttachment], to card: WildReportCardView) {
        guard !attachments.isEmpty else { return }
        attachments.forEach { attachment in
            let chip = WildReportAttachmentChipView(attachment: attachment)
            chip.onRemove = { [weak self] in
                self?.viewModel.removeAttachment(attachment)
            }
            card.stack.addArrangedSubview(chip)
        }
    }

    @objc private func addImageTapped() { viewModel.addImage() }
    @objc private func addVideoTapped() { viewModel.addVideo() }
    @objc private func addPaymentTapped() { viewModel.addPaymentImage() }
    @objc private func refreshLocationTapped() { viewModel.refreshCurrentLocation() }
    @objc private func submitTapped() { viewModel.submitReport() }
    @objc private func contactChanged() { viewModel.updateContact(contactField.text ?? "") }
}

extension WildPhotographerReportSubmitViewController: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        viewModel.updateDescription(textView.text)
    }
}

/// 举报成功页面，展示编号、上传摘要和处理进度。
final class WildPhotographerReportSuccessViewController: BaseViewController {
    private let viewModel: WildPhotographerReportSuccessViewModel
    private let homeViewModel: WildPhotographerReportHomeViewModel
    private let stack = UIStackView()

    init(result: WildReportSubmitResult, homeViewModel: WildPhotographerReportHomeViewModel) {
        self.viewModel = WildPhotographerReportSuccessViewModel(result: result)
        self.homeViewModel = homeViewModel
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = "举报成功"
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackgroundSoft
        stack.axis = .vertical
        stack.spacing = AppSpacing.sm
        view.addSubview(stack)

        let hero = WildReportCardView(spacing: AppSpacing.md)
        hero.stack.alignment = .center
        let icon = UIImageView(image: UIImage(systemName: "checkmark.circle.fill"))
        icon.tintColor = AppColor.success
        icon.snp.makeConstraints { make in make.size.equalTo(58) }
        hero.stack.addArrangedSubview(icon)
        hero.stack.addArrangedSubview(WildReportUI.label("举报已提交", font: .app(.metric), color: AppColor.textPrimary))
        let desc = WildReportUI.label("景区公安已收到线索，将尽快前往现场核实处理", font: .app(.body), color: AppColor.textSecondary, lines: 0)
        desc.textAlignment = .center
        hero.stack.addArrangedSubview(desc)
        stack.addArrangedSubview(hero)

        let info = WildReportCardView(spacing: AppSpacing.sm)
        info.stack.addArrangedSubview(WildReportInfoRowView(title: "举报编号", value: viewModel.result.record.id))
        info.stack.addArrangedSubview(WildReportInfoRowView(title: "上传材料", value: viewModel.uploadSummary))
        info.stack.addArrangedSubview(WildReportInfoRowView(title: "提交时间", value: viewModel.result.record.submitTime))
        stack.addArrangedSubview(info)

        let progress = WildReportCardView(spacing: AppSpacing.sm)
        progress.stack.addArrangedSubview(WildReportUI.label("处理进度", font: .app(.title), color: AppColor.textPrimary))
        viewModel.progressSteps.enumerated().forEach { index, title in
            progress.stack.addArrangedSubview(WildReportUI.label("\(index + 1). \(title)", font: .app(.body), color: AppColor.textSecondary))
        }
        stack.addArrangedSubview(progress)

        let detailButton = AppButton(title: "查看处理进度")
        detailButton.addTarget(self, action: #selector(detailTapped), for: .touchUpInside)
        let homeButton = AppButton(title: "返回首页", style: .secondary)
        homeButton.addTarget(self, action: #selector(homeTapped), for: .touchUpInside)
        stack.addArrangedSubview(detailButton)
        stack.addArrangedSubview(homeButton)
    }

    override func setupConstraints() {
        stack.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide).offset(AppSpacing.md)
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
        }
    }

    @objc private func detailTapped() {
        navigationController?.pushViewController(
            WildPhotographerReportDetailViewController(record: viewModel.result.record, homeViewModel: homeViewModel),
            animated: true
        )
    }

    @objc private func homeTapped() {
        navigationController?.popToViewController(
            navigationController?.viewControllers.first(where: { $0 is WildPhotographerReportHomeViewController }) ?? self,
            animated: true
        )
    }
}