//
//  WildReportSupplementEvidenceViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 补充证据页面，允许为已有举报追加说明和 Mock 附件。
final class WildReportSupplementEvidenceViewController: BaseViewController {
    private let viewModel: WildReportSupplementEvidenceViewModel
    private let scrollView = UIScrollView()
    private let stack = UIStackView()
    private let textView = UITextView()
    private let submitButton = AppButton(title: "提交补充证据")

    init(reportID: String, homeViewModel: WildPhotographerReportHomeViewModel) {
        self.viewModel = WildReportSupplementEvidenceViewModel(reportID: reportID, 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 = "补充证据"
    }

    override func setupUI() {
        view.backgroundColor = AppColor.pageBackgroundSoft
        scrollView.keyboardDismissMode = .interactive
        stack.axis = .vertical
        stack.spacing = AppSpacing.sm
        textView.font = .app(.body)
        textView.textColor = AppColor.textPrimary
        textView.backgroundColor = AppColor.inputBackground
        textView.layer.cornerRadius = AppRadius.md
        textView.textContainerInset = UIEdgeInsets(top: 12, left: 10, bottom: 12, right: 10)
        textView.delegate = self
        submitButton.addTarget(self, action: #selector(submitTapped), for: .touchUpInside)

        view.addSubview(scrollView)
        scrollView.addSubview(stack)
        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)
        }
        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.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] in
            Task { @MainActor in
                self?.showToast("补充证据已提交")
                self?.navigationController?.popViewController(animated: true)
            }
        }
    }

    @MainActor
    private func rebuildContent() {
        stack.arrangedSubviews.forEach { view in
            stack.removeArrangedSubview(view)
            view.removeFromSuperview()
        }
        let textCard = WildReportCardView(spacing: AppSpacing.sm)
        textCard.stack.addArrangedSubview(WildReportUI.label("补充说明", font: .app(.title), color: AppColor.textPrimary))
        textView.text = viewModel.text
        textCard.stack.addArrangedSubview(textView)
        textView.snp.makeConstraints { make in make.height.equalTo(150) }
        let count = WildReportUI.label("\(viewModel.text.count)/500", font: .app(.caption), color: AppColor.textTertiary)
        count.textAlignment = .right
        textCard.stack.addArrangedSubview(count)
        stack.addArrangedSubview(textCard)

        let attachmentCard = WildReportCardView(spacing: AppSpacing.sm)
        attachmentCard.stack.addArrangedSubview(WildReportUI.label("补充材料", font: .app(.title), color: AppColor.textPrimary))
        let row = UIStackView()
        row.axis = .horizontal
        row.spacing = AppSpacing.sm
        row.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) }
            row.addArrangedSubview(button)
        }
        attachmentCard.stack.addArrangedSubview(row)
        (viewModel.images + viewModel.videos).forEach { attachment in
            let chip = WildReportAttachmentChipView(attachment: attachment)
            chip.onRemove = { [weak self] in self?.viewModel.removeAttachment(attachment) }
            attachmentCard.stack.addArrangedSubview(chip)
        }
        stack.addArrangedSubview(attachmentCard)
    }

    @objc private func addImageTapped() { viewModel.addImage() }
    @objc private func addVideoTapped() { viewModel.addVideo() }
    @objc private func submitTapped() { viewModel.submit() }
}

extension WildReportSupplementEvidenceViewController: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        viewModel.updateText(textView.text)
    }
}