//
//  WildPhotographerReportListViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 我的举报列表页，支持按状态筛选并进入举报详情。
final class WildPhotographerReportListViewController: BaseViewController {
    private let viewModel: WildPhotographerReportListViewModel
    private let segmentedControl = UISegmentedControl(items: WildReportListFilter.allCases.map(\.rawValue))
    private let tableView = UITableView(frame: .zero, style: .plain)

    init(homeViewModel: WildPhotographerReportHomeViewModel) {
        self.viewModel = WildPhotographerReportListViewModel(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 = "我的举报"
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackgroundSoft
        segmentedControl.selectedSegmentIndex = 0
        segmentedControl.addTarget(self, action: #selector(filterChanged), for: .valueChanged)

        tableView.backgroundColor = .clear
        tableView.separatorStyle = .none
        tableView.delegate = self
        tableView.dataSource = self
        tableView.register(WildReportListCell.self, forCellReuseIdentifier: WildReportListCell.reuseIdentifier)
        tableView.contentInset = UIEdgeInsets(top: AppSpacing.sm, left: 0, bottom: AppSpacing.lg, right: 0)

        view.addSubview(segmentedControl)
        view.addSubview(tableView)
    }

    override func setupConstraints() {
        segmentedControl.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide).offset(AppSpacing.sm)
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
            make.height.equalTo(36)
        }
        tableView.snp.makeConstraints { make in
            make.top.equalTo(segmentedControl.snp.bottom).offset(AppSpacing.xs)
            make.leading.trailing.bottom.equalTo(view.safeAreaLayoutGuide)
        }
    }

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

    @objc private func filterChanged() {
        let filter = WildReportListFilter.allCases[segmentedControl.selectedSegmentIndex]
        viewModel.selectFilter(filter)
    }
}

extension WildPhotographerReportListViewController: UITableViewDataSource, UITableViewDelegate {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let count = viewModel.filteredReports.count
        tableView.backgroundView = count == 0 ? WildReportEmptyView(text: "暂无相关举报记录") : nil
        return count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: WildReportListCell.reuseIdentifier, for: indexPath) as! WildReportListCell
        let record = viewModel.filteredReports[indexPath.row]
        cell.apply(record: record)
        cell.onShare = { [weak self] in self?.viewModel.shareReport(record) }
        return cell
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        let record = viewModel.filteredReports[indexPath.row]
        navigationController?.pushViewController(
            WildPhotographerReportDetailViewController(record: record, homeViewModel: viewModel.homeViewModel),
            animated: true
        )
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        UITableView.automaticDimension
    }
}

/// 我的举报列表卡片 Cell。
final class WildReportListCell: UITableViewCell {
    static let reuseIdentifier = "WildReportListCell"

    private let card = WildReportCardView(spacing: AppSpacing.sm)
    private let titleLabel = UILabel()
    private let statusView = WildReportStatusView()
    private let typeLabel = UILabel()
    private let locationLabel = UILabel()
    private let timeLabel = UILabel()
    private let descLabel = UILabel()
    private let materialLabel = UILabel()
    var onShare: (() -> Void)?

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        backgroundColor = .clear
        contentView.addSubview(card)
        card.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: AppSpacing.xs, left: AppSpacing.md, bottom: AppSpacing.xs, right: AppSpacing.md))
        }

        let header = UIStackView()
        header.axis = .horizontal
        header.alignment = .center
        header.spacing = AppSpacing.sm
        titleLabel.font = .app(.title)
        titleLabel.textColor = AppColor.textPrimary
        header.addArrangedSubview(titleLabel)
        header.addArrangedSubview(UIView())
        statusView.snp.makeConstraints { make in
            make.width.equalTo(64)
            make.height.equalTo(24)
        }
        header.addArrangedSubview(statusView)

        [typeLabel, locationLabel, timeLabel, descLabel, materialLabel].forEach { label in
            label.font = .app(.body)
            label.textColor = AppColor.textSecondary
            label.numberOfLines = 0
        }

        let shareButton = UIButton(type: .system)
        shareButton.setTitle("分享", for: .normal)
        shareButton.setImage(UIImage(systemName: "square.and.arrow.up"), for: .normal)
        shareButton.titleLabel?.font = .app(.captionMedium)
        shareButton.addTarget(self, action: #selector(shareTapped), for: .touchUpInside)

        card.stack.addArrangedSubview(header)
        card.stack.addArrangedSubview(typeLabel)
        card.stack.addArrangedSubview(locationLabel)
        card.stack.addArrangedSubview(timeLabel)
        card.stack.addArrangedSubview(descLabel)
        card.stack.addArrangedSubview(materialLabel)
        card.stack.addArrangedSubview(shareButton)
    }

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

    func apply(record: WildReportRecord) {
        titleLabel.text = record.title
        statusView.apply(status: record.status)
        typeLabel.text = "举报类型：\(record.reportType.rawValue)"
        locationLabel.text = "位置：\(record.location)"
        timeLabel.text = "提交时间：\(record.submitTime)"
        descLabel.text = record.description
        materialLabel.text = "材料：\(record.imageCount)张图片 \(record.videoCount)段视频"
    }

    @objc private func shareTapped() {
        onShare?()
    }
}

/// 举报详情页。
final class WildPhotographerReportDetailViewController: BaseViewController {
    private let viewModel: WildPhotographerReportDetailViewModel
    private let homeViewModel: WildPhotographerReportHomeViewModel
    private let scrollView = UIScrollView()
    private let stack = UIStackView()

    init(record: WildReportRecord, homeViewModel: WildPhotographerReportHomeViewModel) {
        self.viewModel = WildPhotographerReportDetailViewModel(record: record, homeViewModel: homeViewModel)
        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 = "举报详情"
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            image: UIImage(systemName: "square.and.arrow.up"),
            style: .plain,
            target: self,
            action: #selector(shareTapped)
        )
    }

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

    override func setupConstraints() {
        scrollView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        stack.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.onShowMessage = { [weak self] message in
            Task { @MainActor in self?.showToast(message) }
        }
        homeViewModel.onStateChange = { [weak self] in
            Task { @MainActor in self?.rebuildContent() }
        }
    }

    @MainActor
    private func rebuildContent() {
        stack.arrangedSubviews.forEach { view in
            stack.removeArrangedSubview(view)
            view.removeFromSuperview()
        }
        stack.addArrangedSubview(makeHeaderCard())
        stack.addArrangedSubview(makeProgressCard())
        stack.addArrangedSubview(makeEvidenceCard())
        if viewModel.showHandlerInfo {
            stack.addArrangedSubview(makeHandlerCard())
        }
        stack.addArrangedSubview(makeSupplementCard())
        stack.addArrangedSubview(makeActionButtons())
    }

    private func makeHeaderCard() -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        let header = UIStackView()
        header.axis = .horizontal
        header.alignment = .center
        header.addArrangedSubview(WildReportUI.label(viewModel.heroTitle, font: .app(.metric), color: AppColor.textPrimary))
        header.addArrangedSubview(UIView())
        let status = WildReportStatusView()
        status.apply(status: viewModel.record.status)
        status.snp.makeConstraints { make in
            make.width.equalTo(64)
            make.height.equalTo(24)
        }
        header.addArrangedSubview(status)
        card.stack.addArrangedSubview(header)
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "举报编号", value: viewModel.record.id))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "景区", value: viewModel.scenicAreaName))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "位置", value: viewModel.detailAddress))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "联系方式", value: viewModel.contactText))
        return card
    }

    private func makeProgressCard() -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        card.stack.addArrangedSubview(WildReportUI.label("处理进度", font: .app(.title), color: AppColor.textPrimary))
        viewModel.progressSteps.forEach { step in
            let prefix: String
            switch step.state {
            case .completed: prefix = "✓"
            case .current: prefix = "●"
            case .pending: prefix = "○"
            }
            card.stack.addArrangedSubview(WildReportUI.label("\(prefix) \(step.title)  \(step.timeText)", font: .app(.body), color: AppColor.textSecondary, lines: 0))
        }
        return card
    }

    private func makeEvidenceCard() -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        card.stack.addArrangedSubview(WildReportUI.label("举报证据", font: .app(.title), color: AppColor.textPrimary))
        card.stack.addArrangedSubview(WildReportUI.label(viewModel.descriptionText, font: .app(.body), color: AppColor.textSecondary, lines: 0))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "举报类型", value: viewModel.record.reportType.rawValue))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "举报人材料", value: viewModel.reporterMediaSummary))
        let previewButton = WildReportUI.iconButton(title: "预览材料", imageName: "photo.on.rectangle", style: .secondary)
        previewButton.addTarget(self, action: #selector(previewTapped), for: .touchUpInside)
        card.stack.addArrangedSubview(previewButton)
        return card
    }

    private func makeHandlerCard() -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        guard let info = viewModel.handlerInfo else { return card }
        card.stack.addArrangedSubview(WildReportUI.label("处理信息", font: .app(.title), color: AppColor.textPrimary))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "处理人", value: info.handlerName))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "处理电话", value: info.maskedHandlerPhone))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "处理时间", value: info.processedAt))
        card.stack.addArrangedSubview(WildReportUI.label(info.processOpinion, font: .app(.body), color: AppColor.textSecondary, lines: 0))
        card.stack.addArrangedSubview(WildReportInfoRowView(title: "处理凭证", value: info.completionMediaSummary))
        return card
    }

    private func makeSupplementCard() -> UIView {
        let card = WildReportCardView(spacing: AppSpacing.sm)
        card.stack.addArrangedSubview(WildReportUI.label("补充证据记录", font: .app(.title), color: AppColor.textPrimary))
        let items = viewModel.supplementaryEvidences
        if items.isEmpty {
            card.stack.addArrangedSubview(WildReportUI.label("暂无补充证据", font: .app(.body), color: AppColor.textSecondary))
        } else {
            items.enumerated().forEach { index, item in
                card.stack.addArrangedSubview(WildReportUI.label("第\(items.count - index)次补充 · \(item.submitTime)", font: .app(.bodyMedium), color: AppColor.textPrimary, lines: 0))
                card.stack.addArrangedSubview(WildReportUI.label(item.summaryText, font: .app(.body), color: AppColor.textSecondary, lines: 0))
            }
        }
        return card
    }

    private func makeActionButtons() -> UIView {
        let row = UIStackView()
        row.axis = .vertical
        row.spacing = AppSpacing.sm
        let supplement = AppButton(title: "补充证据")
        supplement.addTarget(self, action: #selector(supplementTapped), for: .touchUpInside)
        let map = AppButton(title: "查看附近风险地图", style: .secondary)
        map.addTarget(self, action: #selector(mapTapped), for: .touchUpInside)
        row.addArrangedSubview(supplement)
        row.addArrangedSubview(map)
        return row
    }

    @objc private func shareTapped() { viewModel.shareReport() }
    @objc private func previewTapped() { viewModel.showMediaPreview(kind: "图片/视频") }

    @objc private func supplementTapped() {
        navigationController?.pushViewController(
            WildReportSupplementEvidenceViewController(reportID: viewModel.record.id, homeViewModel: homeViewModel),
            animated: true
        )
    }

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