//
//  OrderDetailViewControllers.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 门店订单详情页，展示订单接口补全后的支付、客户、项目和拍摄点信息。
final class StoreOrderDetailViewController: UIViewController {

    private let item: OrderEntity
    private let viewModel: OrderDetailViewModel
    private let refundViewModel = OrderRefundViewModel()

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

    init(item: OrderEntity) {
        self.item = item
        self.viewModel = OrderDetailViewModel(item: item)
        super.init(nibName: nil, bundle: nil)
    }

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

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

        viewModel.onChange = { [weak self] in self?.tableView.reloadData() }
        Task { await loadDetail() }
    }

    private func loadDetail() async {
        await appServices.globalLoading.withLoading(message: "加载详情中...") {
            await viewModel.load(api: appServices.ordersAPI, fallbackStoreId: appServices.accountContext.currentStore?.id)
        }
        if let error = viewModel.errorMessage {
            showToast(error)
        }
    }

    private func copyOrderNumber() {
        UIPasteboard.general.string = viewModel.display.orderNumber
        showToast("订单号已复制")
    }

    private func presentRefund() {
        refundViewModel.begin(item: item)
        let alert = UIAlertController(title: "订单退款", message: "可退 ¥\(refundViewModel.availableAmountText(for: item))", 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
            guard let self else { return }
            self.refundViewModel.reason = alert.textFields?.first?.text ?? ""
            Task {
                let success = await self.refundViewModel.submit(api: self.appServices.ordersAPI, item: self.item)
                if success {
                    self.showToast("退款申请已提交")
                    await self.viewModel.load(api: self.appServices.ordersAPI, fallbackStoreId: self.appServices.accountContext.currentStore?.id, forceReload: true)
                } else if let message = self.refundViewModel.errorMessage {
                    self.showToast(message)
                }
            }
        })
        present(alert, animated: true)
    }
}

extension StoreOrderDetailViewController: UITableViewDataSource, UITableViewDelegate {
    func numberOfSections(in tableView: UITableView) -> Int { 6 }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch section {
        case 0: return viewModel.contextMessage == nil ? 0 : 1
        case 1: return 7
        case 2: return 4
        case 3: return 4
        case 4: return viewModel.shootingList.count
        case 5: return 5
        default: return 0
        }
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        switch section {
        case 1: "订单信息"
        case 2: "支付信息"
        case 3: "客户与项目"
        case 4 where !viewModel.shootingList.isEmpty: "拍摄点"
        case 5: "后续功能"
        default: nil
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.selectionStyle = .none
        let display = viewModel.display

        switch indexPath.section {
        case 0:
            cell.textLabel?.text = viewModel.contextMessage
            cell.textLabel?.numberOfLines = 0
        case 1:
            let rows = ["订单号", "状态", "类型", "创建时间", "付款时间", "完成时间", "复制订单号"]
            cell.textLabel?.text = rows[indexPath.row]
            switch indexPath.row {
            case 0: cell.detailTextLabel?.text = display.orderNumber
            case 1: cell.detailTextLabel?.text = display.orderStatusName
            case 2: cell.detailTextLabel?.text = display.orderTypeLabel
            case 3: cell.detailTextLabel?.text = display.createdAt
            case 4: cell.detailTextLabel?.text = displayPayTime
            case 5: cell.detailTextLabel?.text = display.completeTime
            default:
                cell.textLabel?.textColor = AppDesignUIKit.primary
                cell.selectionStyle = .default
            }
        case 2:
            let rows = ["付款金额", "退款金额", "付款方式", "用户 UID"]
            cell.textLabel?.text = rows[indexPath.row]
            switch indexPath.row {
            case 0: cell.detailTextLabel?.text = "¥\(emptyToZero(display.actualPayAmount))"
            case 1: cell.detailTextLabel?.text = "¥\(emptyToZero(display.actualRefundAmount))"
            case 2: cell.detailTextLabel?.text = display.payTypeName
            default: cell.detailTextLabel?.text = "\(display.userId)"
            }
        case 3:
            let rows = ["手机号", "关联项目", "项目 ID", "备注"]
            cell.textLabel?.text = rows[indexPath.row]
            switch indexPath.row {
            case 0: cell.detailTextLabel?.text = display.phone
            case 1: cell.detailTextLabel?.text = display.projectName
            case 2: cell.detailTextLabel?.text = "\(display.projectId)"
            default: cell.detailTextLabel?.text = display.remark
            }
        case 4:
            let shooting = viewModel.shootingList[indexPath.row]
            cell.textLabel?.text = shooting.scenicSpotName
            cell.detailTextLabel?.text = shooting.staffName.isEmpty ? "状态 \(shooting.status)" : shooting.staffName
        case 5:
            let actions = ["历史拍摄", "任务上传", "视频预告", "尾片上传", "退款"]
            cell.textLabel?.text = actions[indexPath.row]
            cell.accessoryType = .disclosureIndicator
            cell.selectionStyle = .default
            if indexPath.row == 4, !refundViewModel.canRefund(item) {
                cell.isUserInteractionEnabled = false
                cell.textLabel?.textColor = AppDesignUIKit.textSecondary
            }
        default: break
        }
        return cell
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        if indexPath.section == 1, indexPath.row == 6 { copyOrderNumber(); return }
        guard indexPath.section == 5 else { return }
        let orderNumber = viewModel.display.orderNumber
        switch indexPath.row {
        case 0:
            HomeMenuRouting.pushOrders(.historicalShooting(orderNumber: orderNumber), from: self)
        case 1 where item.orderType == 19:
            HomeMenuRouting.pushOrders(.multiTravelTaskUpload(orderNumber: orderNumber), from: self)
        case 2:
            HomeMenuRouting.pushOrders(.orderTrailer(orderNumber: orderNumber, title: "视频预告"), from: self)
        case 3:
            HomeMenuRouting.pushOrders(.orderTrailer(orderNumber: orderNumber, title: "尾片上传"), from: self)
        case 4:
            presentRefund()
        default: break
        }
    }

    private var displayPayTime: String {
        let payTime = viewModel.display.payTime
        if payTime.isEmpty || payTime == "0" || payTime.hasPrefix("1970") { return item.depositPayTime }
        return payTime
    }

    private func emptyToZero(_ value: String) -> String {
        value.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty ? "0" : value
    }
}

/// 核销订单详情页，展示核销列表项摘要信息。
final class WriteOffOrderDetailViewController: UIViewController {

    private let item: WriteOffOrderItem

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

    init(item: WriteOffOrderItem) {
        self.item = item
        super.init(nibName: nil, bundle: nil)
    }

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

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "核销详情"
        view.addSubview(tableView)
        tableView.snp.makeConstraints { make in make.edges.equalToSuperview() }
    }
}

extension WriteOffOrderDetailViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 6 }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell(style: .value1, reuseIdentifier: nil)
        cell.selectionStyle = .none
        switch indexPath.row {
        case 0:
            cell.textLabel?.text = "订单号"
            cell.detailTextLabel?.text = item.orderNumber
        case 1:
            cell.textLabel?.text = "项目"
            cell.detailTextLabel?.text = item.projectName
        case 2:
            cell.textLabel?.text = "手机号"
            cell.detailTextLabel?.text = item.userPhone
        case 3:
            cell.textLabel?.text = "金额"
            cell.detailTextLabel?.text = "¥\(item.orderAmount)"
        case 4:
            cell.textLabel?.text = "状态"
            cell.detailTextLabel?.text = item.orderStatusName
        default:
            cell.textLabel?.text = "核销时间"
            cell.detailTextLabel?.text = item.orderVerificationTime
        }
        return cell
    }
}