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

import UIKit

class ViewController: UIViewController {

    private var tableView: UITableView!

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

    private var menuItems: [[MenuItem]] = [
        [
            MenuItem(icon: "tray.full", iconColor: .systemIndigo, title: "收集箱", identifier: "inbox"),
            MenuItem(icon: "note.text", iconColor: .systemYellow, title: "打开备忘录", identifier: "notes"),
            MenuItem(icon: "doc.text", iconColor: .systemBlue, title: "格式化日志", identifier: "formatLog"),
            MenuItem(icon: "text.alignleft", iconColor: .systemGreen, title: "格式化笔记", identifier: "formatNote"),
            MenuItem(icon: "folder", iconColor: .systemOrange, title: "打开文件", identifier: "files")
        ]
    ]

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

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        updateInboxBadge()
    }

    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.identifier {
        case "inbox":
            let viewController = ClipInboxViewController()
            navigationController?.pushViewController(viewController, animated: true)
        case "notes":
            openSystemNotesApp()
        case "formatLog":
            let viewController = FormatLogViewController()
            navigationController?.pushViewController(viewController, animated: true)
        case "formatNote":
            let viewController = FormatNoteViewController()
            navigationController?.pushViewController(viewController, animated: true)
        case "files":
            openFilesApp()
        default:
            break
        }
    }

    private func updateInboxBadge() {
        Task {
            guard let count = try? await ClipStore.shared.count(), count > 0 else {
                await MainActor.run {
                    self.updateInboxTitle("收集箱")
                }
                return
            }
            await MainActor.run {
                self.updateInboxTitle("收集箱（\(count)）")
            }
        }
    }

    private func updateInboxTitle(_ title: String) {
        for (sectionIndex, section) in menuItems.enumerated() {
            for (rowIndex, item) in section.enumerated() {
                if item.identifier == "inbox" {
                    menuItems[sectionIndex][rowIndex] = MenuItem(
                        icon: item.icon,
                        iconColor: item.iconColor,
                        title: title,
                        identifier: item.identifier
                    )
                    let indexPath = IndexPath(row: rowIndex, section: sectionIndex)
                    tableView.reloadRows(at: [indexPath], with: .none)
                    return
                }
            }
        }
    }

    private func openSystemNotesApp() {
        openURLIfPossible("mobilenotes://")
    }

    private func openFilesApp() {
        openURLIfPossible("shareddocuments://")
    }

    private func openURLIfPossible(_ string: String) {
        guard let url = URL(string: string) else { return }
        guard UIApplication.shared.canOpenURL(url) else { return }
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
    }
}