//
//  PermissionApplyStatusViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 权限申请审核状态页，对齐 Android `PermissionApplyStatusScreen`。
final class PermissionApplyStatusViewController: BaseViewController {

    private let viewModel: PermissionApplyStatusViewModel
    private let homeAPI: HomeAPI

    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let bannerView = PermissionApplyBannerView()
    private let loadingIndicator = UIActivityIndicatorView(style: .medium)

    init(
        applyCode: String,
        viewModel: PermissionApplyStatusViewModel? = nil,
        homeAPI: HomeAPI = NetworkServices.shared.homeAPI
    ) {
        self.viewModel = viewModel ?? PermissionApplyStatusViewModel(applyCode: applyCode)
        self.homeAPI = homeAPI
        super.init(nibName: nil, bundle: nil)
    }

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

    override func setupNavigationBar() {
        title = "权限申请"
    }

    override func setupUI() {
        contentStack.axis = .vertical
        contentStack.spacing = 12
        scrollView.addSubview(contentStack)
        view.addSubview(scrollView)
        view.addSubview(loadingIndicator)

        contentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(UIEdgeInsets(top: 0, left: 16, bottom: 16, right: 16))
            make.width.equalTo(scrollView).offset(-32)
        }
        scrollView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        loadingIndicator.snp.makeConstraints { make in
            make.center.equalToSuperview()
        }
    }

    override func bindActions() {
        viewModel.onStateChange = { [weak self] in
            Task { @MainActor in self?.applyViewModel() }
        }
        viewModel.onNavigateToEdit = { [weak self] pending in
            Task { @MainActor in self?.navigateToEdit(pending: pending) }
        }
        bannerView.onApplyNewScenic = { [weak self] in
            self?.navigationController?.pushViewController(ScenicApplicationViewController(), animated: true)
        }
        Task { await viewModel.loadPendingData(api: homeAPI) }
    }

    private func applyViewModel() {
        if viewModel.isLoading {
            loadingIndicator.startAnimating()
            scrollView.isHidden = true
            return
        }
        loadingIndicator.stopAnimating()
        scrollView.isHidden = false
        contentStack.arrangedSubviews.forEach { $0.removeFromSuperview() }
        contentStack.addArrangedSubview(bannerView)

        navigationItem.rightBarButtonItem = nil
        if let pending = viewModel.pendingData, pending.status == PermissionApplyPendingStatus.rejected {
            navigationItem.rightBarButtonItem = UIBarButtonItem(
                title: "去编辑",
                style: .plain,
                target: self,
                action: #selector(editTapped)
            )
            navigationItem.rightBarButtonItem?.tintColor = AppColor.primary
        }

        guard let pending = viewModel.pendingData else { return }

        contentStack.addArrangedSubview(makeStatusCard(pending: pending))
        contentStack.addArrangedSubview(makeSectionCard(title: "新增角色", chips: [pending.roleName]))
        if !pending.scenicList.isEmpty {
            contentStack.addArrangedSubview(
                makeSectionCard(title: "新增景区", chips: pending.scenicList.map(\.name))
            )
        }
    }

    private func makeStatusCard(pending: RoleApplyPendingResponse) -> UIView {
        let card = UIView()
        card.backgroundColor = AppColor.warningBackground
        card.layer.cornerRadius = 12
        card.layer.borderWidth = 1
        card.layer.borderColor = AppColor.warning.cgColor

        let statusLabel = UILabel()
        statusLabel.text = pending.statusLabel
        statusLabel.font = .systemFont(ofSize: 18, weight: .medium)
        statusLabel.textColor = AppColor.warning

        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 8
        stack.addArrangedSubview(statusLabel)
        [
            ("提交时间:", pending.createdAt),
            ("审核时间:", pending.auditedAt ?? "--"),
            ("审核人:", pending.auditedBy ?? "--"),
            ("审核备注:", pending.auditNote.isEmpty ? "--" : pending.auditNote),
        ].forEach { label, value in
            stack.addArrangedSubview(makeInfoRow(label: label, value: value))
        }

        card.addSubview(stack)
        stack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16)
        }
        return card
    }

    private func makeSectionCard(title: String, chips: [String]) -> UIView {
        let card = UIView()
        card.backgroundColor = .white
        card.layer.cornerRadius = 12

        let titleLabel = UILabel()
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 16, weight: .medium)
        titleLabel.textColor = AppColor.textPrimary

        let chipStack = UIStackView()
        chipStack.axis = .horizontal
        chipStack.spacing = 8
        chips.forEach { name in
            chipStack.addArrangedSubview(PermissionTagChip(title: name, showsRemove: false))
        }

        card.addSubview(titleLabel)
        card.addSubview(chipStack)
        titleLabel.snp.makeConstraints { make in
            make.top.leading.trailing.equalToSuperview().inset(16)
        }
        chipStack.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(12)
            make.leading.trailing.bottom.equalToSuperview().inset(16)
        }
        return card
    }

    private func makeInfoRow(label: String, value: String) -> UIView {
        let row = UIStackView()
        row.axis = .horizontal
        row.distribution = .equalSpacing
        let left = UILabel()
        left.text = label
        left.font = .systemFont(ofSize: 14)
        left.textColor = AppColor.textSecondary
        let right = UILabel()
        right.text = value.isEmpty ? "--" : value
        right.font = .systemFont(ofSize: 14)
        right.textColor = AppColor.textSecondary
        right.textAlignment = .right
        row.addArrangedSubview(left)
        row.addArrangedSubview(right)
        return row
    }

    @objc private func editTapped() {
        viewModel.navigateToEditIfRejected()
    }

    private func navigateToEdit(pending: RoleApplyPendingResponse) {
        var controllers = navigationController?.viewControllers ?? []
        controllers.removeAll { $0 is PermissionApplyStatusViewController }
        let applyVC = PermissionApplyViewController(pendingData: pending)
        controllers.append(applyVC)
        navigationController?.setViewControllers(controllers, animated: true)
    }
}