//
//  PreviewViewController.swift
//  Note
//
//  Created by fish on 2026/7/13.
//

import UIKit

class PreviewViewController: UIViewController {

    private var textView: UITextView!
    private var logButton: UIButton!
    private var noteButton: UIButton!

    var initialText: String?
    var fileName: String?

    override func viewDidLoad() {
        super.viewDidLoad()
        title = "预览"
        navigationItem.largeTitleDisplayMode = .never
        view.backgroundColor = .systemGroupedBackground
        setupUI()
    }

    private func setupUI() {
        textView = UITextView()
        textView.translatesAutoresizingMaskIntoConstraints = false
        textView.backgroundColor = UIColor { traitCollection in
            traitCollection.userInterfaceStyle == .dark ? .secondarySystemBackground : .white
        }
        textView.layer.cornerRadius = 12
        textView.layer.borderWidth = 0.5
        textView.layer.borderColor = UIColor.separator.cgColor
        textView.layer.masksToBounds = true
        textView.font = UIFont.preferredFont(forTextStyle: .body)
        textView.textContainerInset = UIEdgeInsets(top: 12, left: 12, bottom: 12, right: 12)
        textView.isEditable = false
        textView.isSelectable = true
        textView.text = initialText
        view.addSubview(textView)

        logButton = createBottomButton(title: "处理日志", color: .systemBlue)
        logButton.addTarget(self, action: #selector(didTapLogButton), for: .touchUpInside)
        view.addSubview(logButton)

        noteButton = createBottomButton(title: "处理 Note", color: .systemGreen)
        noteButton.addTarget(self, action: #selector(didTapNoteButton), for: .touchUpInside)
        view.addSubview(noteButton)

        let safeArea = view.safeAreaLayoutGuide
        let buttonHeight: CGFloat = 52
        let spacing: CGFloat = 16

        NSLayoutConstraint.activate([
            textView.topAnchor.constraint(equalTo: safeArea.topAnchor, constant: spacing),
            textView.leadingAnchor.constraint(equalTo: safeArea.leadingAnchor, constant: spacing),
            textView.trailingAnchor.constraint(equalTo: safeArea.trailingAnchor, constant: -spacing),

            logButton.topAnchor.constraint(equalTo: textView.bottomAnchor, constant: spacing),
            logButton.leadingAnchor.constraint(equalTo: safeArea.leadingAnchor, constant: spacing),
            logButton.trailingAnchor.constraint(equalTo: safeArea.centerXAnchor, constant: -spacing / 2),
            logButton.heightAnchor.constraint(equalToConstant: buttonHeight),
            logButton.bottomAnchor.constraint(equalTo: safeArea.bottomAnchor, constant: -spacing),

            noteButton.topAnchor.constraint(equalTo: textView.bottomAnchor, constant: spacing),
            noteButton.leadingAnchor.constraint(equalTo: safeArea.centerXAnchor, constant: spacing / 2),
            noteButton.trailingAnchor.constraint(equalTo: safeArea.trailingAnchor, constant: -spacing),
            noteButton.heightAnchor.constraint(equalToConstant: buttonHeight),
            noteButton.bottomAnchor.constraint(equalTo: safeArea.bottomAnchor, constant: -spacing)
        ])
    }

    private func createBottomButton(title: String, color: UIColor) -> UIButton {
        var config = UIButton.Configuration.filled()
        config.title = title
        config.baseBackgroundColor = color
        config.baseForegroundColor = .white
        config.cornerStyle = .medium
        config.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 16)

        let button = UIButton(configuration: config)
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }

    @objc private func didTapLogButton() {
        let viewController = FormatLogViewController()
        viewController.initialText = TextFormatter.formatLog(initialText ?? "")
        navigationController?.pushViewController(viewController, animated: true)
    }

    @objc private func didTapNoteButton() {
        let viewController = FormatNoteViewController()
        viewController.initialText = TextFormatter.formatForNote(initialText ?? "")
        navigationController?.pushViewController(viewController, animated: true)
    }
}