note/Note/ViewController.swift

//
//  ViewController.swift
//  Note
//
//  Created by fish on 2026/7/12.
//

import UIKit
import UniformTypeIdentifiers

class ViewController: UIViewController {

    private var tableView: UITableView!

    private struct MenuItem {
        let icon: String
        let iconColor: UIColor
        let title: String
    }

    private let menuItems: [[MenuItem]] = [
        [
            MenuItem(icon: "note.text", iconColor: .systemYellow, title: "打开备忘录"),
            MenuItem(icon: "doc.text", iconColor: .systemBlue, title: "格式化日志"),
            MenuItem(icon: "text.alignleft", iconColor: .systemGreen, title: "格式化笔记"),
            MenuItem(icon: "folder", iconColor: .systemOrange, title: "打开文件")
        ]
    ]

    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
    }

    private func setupUI() {
        title = "首页"
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationItem.largeTitleDisplayMode = .always
        view.backgroundColor = .systemGroupedBackground

        tableView = UITableView(frame: .zero, style: .insetGrouped)
        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.delegate = self
        tableView.dataSource = self
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "menuCell")
        tableView.backgroundColor = .systemGroupedBackground
        view.addSubview(tableView)

        NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: view.topAnchor),
            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ])
    }
}

extension ViewController: UITableViewDataSource {

    func numberOfSections(in tableView: UITableView) -> Int {
        return menuItems.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return menuItems[section].count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath)
        let item = menuItems[indexPath.section][indexPath.row]

        var config = cell.defaultContentConfiguration()
        config.text = item.title
        config.image = UIImage(systemName: item.icon)
        config.imageProperties.tintColor = item.iconColor
        config.imageToTextPadding = 12
        cell.contentConfiguration = config
        cell.accessoryType = .disclosureIndicator

        return cell
    }
}

extension ViewController: UITableViewDelegate {

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)

        let item = menuItems[indexPath.section][indexPath.row]
        switch item.title {
        case "打开备忘录":
            openSystemNotesApp()
        case "格式化日志":
            let viewController = FormatLogViewController()
            navigationController?.pushViewController(viewController, animated: true)
        case "格式化笔记":
            let viewController = FormatNoteViewController()
            navigationController?.pushViewController(viewController, animated: true)
        case "打开文件":
            openFiles()
        default:
            break
        }
    }

    private func openSystemNotesApp() {
        guard let url = URL(string: "mobilenotes://") else { return }
        guard UIApplication.shared.canOpenURL(url) else { return }
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
    }

    private func openFiles() {
        let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [.item], asCopy: true)
        documentPicker.delegate = self
        documentPicker.allowsMultipleSelection = false
        present(documentPicker, animated: true)
    }
}

extension ViewController: UIDocumentPickerDelegate {

    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
        guard let url = urls.first else { return }
        let fileName = url.lastPathComponent

        var message: String?
        if let data = try? Data(contentsOf: url),
           let text = String(data: data, encoding: .utf8),
           !text.isEmpty {
            message = text
        } else {
            let attributes = try? FileManager.default.attributesOfItem(atPath: url.path)
            let size = attributes?[.size] as? Int64 ?? 0
            message = "无法以文本预览\n大小: \(size) 字节"
        }

        let alert = UIAlertController(title: fileName, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "确定", style: .default))
        present(alert, animated: true)
    }

    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
    }
}