//
//  TaskViewControllers.swift
//  suixinkan
//
//  Created by Codex on 2026/6/26.
//

import UIKit

/// 任务管理列表页。
final class TaskManagementViewController: ModuleTableViewController {
    private let viewModel = TaskManagementViewModel()

    override func viewDidLoad() {
        title = "任务管理"
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "发布",
            style: .plain,
            target: self,
            action: #selector(createTask)
        )
        super.viewDidLoad()
        wireViewModel(viewModel) { }
    }

    override func tableRowCount() -> Int {
        viewModel.tasks.count
    }

    override func configureCell(_ cell: TitleSubtitleTableViewCell, at indexPath: IndexPath) {
        let task = viewModel.tasks[indexPath.row]
        cell.configure(title: task.name, subtitle: task.statusName, detail: task.createdAt)
    }

    override func didSelectTableRow(at indexPath: IndexPath) {
        let task = viewModel.tasks[indexPath.row]
        navigationController?.pushViewController(
            TaskDetailViewController(taskId: task.id, summary: task),
            animated: true
        )
    }

    override func reloadContent() async {
        try? await viewModel.reload(api: services.taskAPI, scenicId: services.currentScenicId)
    }

    override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        guard indexPath.row >= viewModel.tasks.count - 2 else { return }
        Task { try? await viewModel.loadMore(api: services.taskAPI, scenicId: services.currentScenicId) }
    }

    @objc private func createTask() {
        navigationController?.pushViewController(TaskCreateViewController(), animated: true)
    }
}

extension TaskManagementViewModel: ViewModelBindable {}

/// 任务详情页。
final class TaskDetailViewController: ModuleTableViewController {
    private let taskId: Int
    private let summary: PhotographerTaskItem?
    private let viewModel = TaskDetailViewModel()

    init(taskId: Int, summary: PhotographerTaskItem?) {
        self.taskId = taskId
        self.summary = summary
        super.init(nibName: nil, bundle: nil)
    }

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

    override func viewDidLoad() {
        title = summary?.name ?? "任务详情"
        super.viewDidLoad()
        wireViewModel(viewModel) { [weak self] in
            self?.title = self?.viewModel.detail?.name ?? self?.summary?.name ?? "任务详情"
        }
    }

    override func tableRowCount() -> Int {
        guard let detail = viewModel.detail else { return summary == nil ? 0 : 4 }
        return 6
    }

    override func configureCell(_ cell: TitleSubtitleTableViewCell, at indexPath: IndexPath) {
        if let detail = viewModel.detail {
            switch indexPath.row {
            case 0: cell.configure(title: "任务名称", subtitle: detail.name)
            case 1: cell.configure(title: "状态", subtitle: detail.taskStatusLabel)
            case 2: cell.configure(title: "订单号", subtitle: detail.order?.orderNumber ?? "--")
            case 3: cell.configure(title: "备注", subtitle: detail.photogRemark)
            case 4: cell.configure(title: "创建时间", subtitle: detail.createdAt)
            default: cell.configure(title: "附件", subtitle: "\(detail.taskResult.count) 个")
            }
        } else if let summary {
            switch indexPath.row {
            case 0: cell.configure(title: "任务名称", subtitle: summary.name)
            case 1: cell.configure(title: "状态", subtitle: summary.statusName)
            case 2: cell.configure(title: "订单号", subtitle: summary.orderNumber)
            default: cell.configure(title: "创建时间", subtitle: summary.createdAt)
            }
        }
    }

    override func reloadContent() async {
        await viewModel.load(api: services.taskAPI, taskId: taskId)
    }
}

extension TaskDetailViewModel: ViewModelBindable {}

/// 发布任务页。
final class TaskCreateViewController: ModuleTableViewController {
    private let viewModel = TaskCreateViewModel()
    private let nameField = UITextField()
    private let remarkField = UITextField()

    override func viewDidLoad() {
        title = "发布任务"
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "提交",
            style: .done,
            target: self,
            action: #selector(submit)
        )
        super.viewDidLoad()
        setupHeader()
        wireViewModel(viewModel) { }
    }

    private func setupHeader() {
        nameField.placeholder = "任务名称"
        nameField.borderStyle = .roundedRect
        remarkField.placeholder = "备注"
        remarkField.borderStyle = .roundedRect
        let stack = UIStackView(arrangedSubviews: [nameField, remarkField])
        stack.axis = .vertical
        stack.spacing = 8
        stack.frame = CGRect(x: 0, y: 0, width: view.bounds.width, height: 96)
        stack.layoutMargins = UIEdgeInsets(top: 12, left: 16, bottom: 12, right: 16)
        stack.isLayoutMarginsRelativeArrangement = true
        tableView.tableHeaderView = stack
    }

    override func tableRowCount() -> Int {
        viewModel.availableOrders.count
    }

    override func configureCell(_ cell: TitleSubtitleTableViewCell, at indexPath: IndexPath) {
        let order = viewModel.availableOrders[indexPath.row]
        let selected = viewModel.selectedOrder?.orderNumber == order.orderNumber
        cell.configure(title: order.orderNumber, subtitle: order.projectName, detail: selected ? "已选择" : nil)
        cell.accessoryType = selected ? .checkmark : .none
    }

    override func didSelectTableRow(at indexPath: IndexPath) {
        viewModel.selectedOrder = viewModel.availableOrders[indexPath.row]
    }

    override func reloadContent() async {
        await viewModel.loadAvailableOrders(api: services.taskAPI, scenicId: services.currentScenicId)
    }

    @objc private func submit() {
        viewModel.taskName = nameField.text ?? ""
        viewModel.remark = remarkField.text ?? ""
        Task {
            do {
                let success = try await viewModel.submit(
                    api: services.taskAPI,
                    uploadService: services.ossUploadService,
                    scenicId: services.currentScenicId
                )
                if success {
                    navigationController?.popViewController(animated: true)
                }
            } catch {
                services.toastCenter.show(error.localizedDescription)
            }
        }
    }
}

extension TaskCreateViewModel: ViewModelBindable {}