//
//  DepositOrderViewControllers.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 押金订单列表页，支持查询、分页、核销和退款。
final class DepositOrderListViewController: UIViewController {

    private let viewModel = DepositOrderListViewModel()
    private var orderNumberField = UITextField()

    private lazy var tableView: UITableView = {
        let table = UITableView(frame: .zero, style: .insetGrouped)
        table.dataSource = self
        table.delegate = self
        table.register(DepositOrderCell.self, forCellReuseIdentifier: DepositOrderCell.reuseID)
        return table
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "押金订单"
        view.backgroundColor = AppDesignUIKit.pageBackground
        view.addSubview(tableView)
        tableView.snp.makeConstraints { make in make.edges.equalToSuperview() }

        viewModel.onChange = { [weak self] in self?.tableView.reloadData() }
        setupHeader()
        Task { await reload(showLoading: true) }
    }

    private func setupHeader() {
        let header = UIView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: 120))
        orderNumberField.placeholder = "请输入押金订单号"
        orderNumberField.borderStyle = .roundedRect
        orderNumberField.autocorrectionType = .no
        orderNumberField.autocapitalizationType = .none

        let detailButton = makePrimaryButton(title: "查看订单详情")
        detailButton.addTarget(self, action: #selector(openDetail), for: .touchUpInside)

        header.addSubview(orderNumberField)
        header.addSubview(detailButton)
        orderNumberField.snp.makeConstraints { make in
            make.top.leading.trailing.equalToSuperview().inset(16)
            make.height.equalTo(44)
        }
        detailButton.snp.makeConstraints { make in
            make.top.equalTo(orderNumberField.snp.bottom).offset(12)
            make.leading.trailing.equalToSuperview().inset(16)
        }
        tableView.tableHeaderView = header
    }

    @objc private func openDetail() {
        let text = orderNumberField.text?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        guard !text.isEmpty else { return }
        HomeMenuRouting.pushOrders(.depositDetail(orderNumber: text), from: self)
    }

    private func reload(showLoading: Bool) async {
        if showLoading {
            await appServices.globalLoading.withLoading {
                await viewModel.reload(api: appServices.ordersAPI, scenicId: appServices.accountContext.currentScenic?.id, reset: true)
            }
        } else {
            await viewModel.reload(api: appServices.ordersAPI, scenicId: appServices.accountContext.currentScenic?.id, reset: true)
        }
        if let message = viewModel.errorMessage { showToast(message) }
    }

    private func writeOff(_ item: DepositOrderListItem) {
        let alert = UIAlertController(title: "确认核销该押金订单？", message: item.orderNumber, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "取消", style: .cancel))
        alert.addAction(UIAlertAction(title: "确认核销", style: .default) { [weak self] _ in
            Task {
                guard let self else { return }
                let success = await self.viewModel.writeOff(api: self.appServices.ordersAPI, scenicId: self.appServices.accountContext.currentScenic?.id, orderNumber: item.orderNumber)
                if success { self.showToast("核销成功") }
                else if let message = self.viewModel.errorMessage { self.showToast(message) }
            }
        })
        present(alert, animated: true)
    }

    private func refund(_ item: DepositOrderListItem) {
        let alert = UIAlertController(title: "申请退款", message: "请填写退款原因", preferredStyle: .alert)
        alert.addTextField { $0.placeholder = "退款原因" }
        alert.addAction(UIAlertAction(title: "取消", style: .cancel))
        alert.addAction(UIAlertAction(title: "提交", style: .default) { [weak self] _ in
            Task {
                guard let self else { return }
                let reason = alert.textFields?.first?.text ?? ""
                let success = await self.viewModel.refund(api: self.appServices.ordersAPI, scenicId: self.appServices.accountContext.currentScenic?.id, orderNumber: item.orderNumber, reason: reason)
                if success { self.showToast("退款申请已提交") }
                else if let message = self.viewModel.errorMessage { self.showToast(message) }
            }
        })
        present(alert, animated: true)
    }
}

extension DepositOrderListViewController: UITableViewDataSource, UITableViewDelegate {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        max(viewModel.orders.count, 1)
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        "押金订单列表 \(viewModel.orders.count)/\(viewModel.total)"
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard !viewModel.orders.isEmpty else {
            let cell = UITableViewCell()
            cell.textLabel?.text = viewModel.loading ? "加载中..." : "暂无押金订单"
            cell.selectionStyle = .none
            return cell
        }
        let cell = tableView.dequeueReusableCell(withIdentifier: DepositOrderCell.reuseID, for: indexPath) as! DepositOrderCell
        let item = viewModel.orders[indexPath.row]
        cell.configure(item: item, isOperating: viewModel.operatingOrderNumber == item.orderNumber)
        cell.onDetail = { [weak self] in
            self.flatMap { HomeMenuRouting.pushOrders(.depositDetail(orderNumber: item.orderNumber), from: $0) }
        }
        cell.onWriteOff = { [weak self] in self?.writeOff(item) }
        cell.onRefund = { [weak self] in self?.refund(item) }
        return cell
    }

    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        guard indexPath.row == viewModel.orders.count - 1, viewModel.hasMore else { return }
        Task {
            await viewModel.reload(api: appServices.ordersAPI, scenicId: appServices.accountContext.currentScenic?.id, reset: false)
        }
    }
}

private final class DepositOrderCell: UITableViewCell {
    static let reuseID = "DepositOrderCell"
    var onDetail: (() -> Void)?
    var onWriteOff: (() -> Void)?
    var onRefund: (() -> Void)?

    private let titleLabel = UILabel()
    private let statusLabel = UILabel()
    private let amountLabel = UILabel()

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .none
        titleLabel.font = .systemFont(ofSize: AppMetrics.FontSize.subheadline, weight: .semibold)
        statusLabel.font = .systemFont(ofSize: AppMetrics.FontSize.caption)
        amountLabel.font = .systemFont(ofSize: AppMetrics.FontSize.body, weight: .semibold)
        amountLabel.textColor = AppDesignUIKit.primary

        let detailButton = UIButton(type: .system)
        detailButton.setTitle("详情", for: .normal)
        detailButton.addTarget(self, action: #selector(detailTapped), for: .touchUpInside)
        let writeOffButton = UIButton(type: .system)
        writeOffButton.setTitle("核销", for: .normal)
        writeOffButton.addTarget(self, action: #selector(writeOffTapped), for: .touchUpInside)
        let refundButton = UIButton(type: .system)
        refundButton.setTitle("退款", for: .normal)
        refundButton.addTarget(self, action: #selector(refundTapped), for: .touchUpInside)

        let buttonRow = UIStackView(arrangedSubviews: [detailButton, writeOffButton, refundButton])
        buttonRow.axis = .horizontal
        buttonRow.distribution = .fillEqually

        let stack = UIStackView(arrangedSubviews: [titleLabel, amountLabel, buttonRow])
        stack.axis = .vertical
        stack.spacing = 8
        contentView.addSubview(stack)
        contentView.addSubview(statusLabel)
        stack.snp.makeConstraints { make in make.edges.equalToSuperview().inset(12) }
        statusLabel.snp.makeConstraints { make in make.trailing.top.equalToSuperview().inset(12) }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { fatalError() }

    func configure(item: DepositOrderListItem, isOperating: Bool) {
        titleLabel.text = item.orderNumber
        statusLabel.text = isOperating ? "处理中" : item.statusName
        amountLabel.text = "¥\(item.amount.isEmpty ? "0.00" : item.amount)"
    }

    @objc private func detailTapped() { onDetail?() }
    @objc private func writeOffTapped() { onWriteOff?() }
    @objc private func refundTapped() { onRefund?() }
}

/// 押金订单详情页。
final class DepositOrderDetailViewController: UIViewController {

    private let orderNumber: String
    private let viewModel = DepositOrderDetailViewModel()

    private lazy var tableView: UITableView = {
        let table = UITableView(frame: .zero, style: .insetGrouped)
        table.dataSource = self
        table.backgroundColor = AppDesignUIKit.pageBackground
        return table
    }()

    init(orderNumber: String) {
        self.orderNumber = orderNumber
        super.init(nibName: nil, bundle: nil)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { fatalError() }

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "押金订单详情"
        view.addSubview(tableView)
        tableView.snp.makeConstraints { make in make.edges.equalToSuperview() }
        Task { await loadDetail() }
    }

    private func loadDetail() async {
        await appServices.globalLoading.withLoading {
            await viewModel.load(
                api: appServices.ordersAPI,
                storeId: appServices.accountContext.currentStore?.id,
                orderNumber: orderNumber
            )
        }
        tableView.reloadData()
        if let message = viewModel.errorMessage { showToast(message) }
    }
}

extension DepositOrderDetailViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        viewModel.detail == nil ? 1 : 8
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.selectionStyle = .none
        guard let detail = viewModel.detail else {
            cell.textLabel?.text = viewModel.errorMessage ?? (viewModel.loading ? "加载中..." : "暂无详情")
            return cell
        }
        let rows: [(String, String)] = [
            ("订单号", detail.orderNumber),
            ("状态", detail.orderStatusName),
            ("类型", detail.orderTypeLabel),
            ("付款金额", detail.actualPayAmount),
            ("手机号", detail.phone),
            ("项目", detail.projectName),
            ("创建时间", detail.createdAt),
            ("备注", detail.remark)
        ]
        cell.textLabel?.text = rows[indexPath.row].0
        cell.detailTextLabel?.text = rows[indexPath.row].1
        return cell
    }
}

/// 押金拍摄信息页。
final class DepositOrderShootingInfoViewController: UIViewController {

    private let orderNumber: String
    private let scenicSpotId: Int
    private let photogUid: Int
    private let viewModel = DepositOrderShootingInfoViewModel()

    private lazy var tableView: UITableView = {
        let table = UITableView(frame: .zero, style: .insetGrouped)
        table.dataSource = self
        return table
    }()

    init(orderNumber: String, scenicSpotId: Int, photogUid: Int) {
        self.orderNumber = orderNumber
        self.scenicSpotId = scenicSpotId
        self.photogUid = photogUid
        super.init(nibName: nil, bundle: nil)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { fatalError() }

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "押金拍摄信息"
        view.addSubview(tableView)
        tableView.snp.makeConstraints { make in make.edges.equalToSuperview() }
        Task { await loadDetail() }
    }

    private func loadDetail() async {
        await appServices.globalLoading.withLoading {
            await viewModel.load(
                api: appServices.ordersAPI,
                storeId: appServices.accountContext.currentStore?.id,
                orderNumber: orderNumber,
                scenicSpotId: scenicSpotId,
                photogUid: photogUid
            )
        }
        tableView.reloadData()
        if let message = viewModel.errorMessage { showToast(message) }
    }
}

extension DepositOrderShootingInfoViewController: UITableViewDataSource {
    func numberOfSections(in tableView: UITableView) -> Int {
        viewModel.detail == nil ? 1 : 3
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        guard let detail = viewModel.detail else { return 1 }
        switch section {
        case 0: return 2
        case 1: return detail.materialList.count
        default: return detail.completeList.count
        }
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        guard viewModel.detail != nil else { return nil }
        switch section {
        case 1: return "素材"
        case 2: return "成片"
        default: return nil
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let detail = viewModel.detail else {
            let cell = UITableViewCell()
            cell.textLabel?.text = viewModel.errorMessage ?? "加载中..."
            return cell
        }
        if indexPath.section == 0 {
            let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
            if indexPath.row == 0 {
                cell.textLabel?.text = "打卡点"
                cell.detailTextLabel?.text = detail.scenicSpotName
            } else {
                cell.textLabel?.text = "拍摄评分"
                cell.detailTextLabel?.text = detail.orderComment.map { "\($0.starShooting) 星" } ?? "--"
            }
            return cell
        }
        let files = indexPath.section == 1 ? detail.materialList : detail.completeList
        let media = files[indexPath.row]
        let cell = UITableViewCell(style: .subtitle, reuseIdentifier: nil)
        cell.textLabel?.text = media.fileName
        cell.detailTextLabel?.text = media.fileUrl
        return cell
    }
}