// Copyright (C) 2024 Rubén Beltrán del Río

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see https://map.tranquil.systems.
import AppKit

class HoverView: NSView {
  weak var controller: MapTextEditorController?
  private let action: () -> Void

  init(
    message: String,
    action: @escaping () -> Void,
    actionLabel: String = String(localized: "map_editor.add_missing_component"),
    controller: MapTextEditorController
  ) {
    self.controller = controller
    self.action = action
    super.init(frame: .zero)

    setupView(message: message, actionLabel: actionLabel)
    setupTrackingArea()
  }

  required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  private func setupView(message: String, actionLabel: String) {
    wantsLayer = true
    layer?.backgroundColor = NSColor.controlBackgroundColor.cgColor
    layer?.borderColor = NSColor.separatorColor.cgColor
    layer?.borderWidth = 1
    layer?.cornerRadius = 8

    let label = NSTextField(labelWithString: message)
    label.font = NSFont.Theme.SmallControl.regular
    label.textColor = NSColor.labelColor

    let button = NSButton(title: actionLabel, target: self, action: #selector(buttonClicked))
    button.bezelStyle = .accessoryBarAction
    button.font = NSFont.Theme.SmallControl.emphasized
    button.controlSize = .mini

    addSubview(label)
    addSubview(button)

    label.translatesAutoresizingMaskIntoConstraints = false
    button.translatesAutoresizingMaskIntoConstraints = false

    NSLayoutConstraint.activate([
      label.topAnchor.constraint(equalTo: topAnchor, constant: 8),
      label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 8),
      label.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -8),

      button.topAnchor.constraint(equalTo: topAnchor, constant: 8),
      button.leadingAnchor.constraint(equalTo: label.trailingAnchor, constant: 8),
      button.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -8),
      button.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -8),

      heightAnchor.constraint(equalToConstant: 32),
    ])
  }

  private func setupTrackingArea() {
    let trackingArea = NSTrackingArea(
      rect: bounds,
      options: [.mouseEnteredAndExited, .mouseMoved, .activeInKeyWindow, .inVisibleRect],
      owner: self,
      userInfo: nil
    )
    addTrackingArea(trackingArea)
  }

  @objc private func buttonClicked() {
    action()
  }

  override func mouseEntered(with event: NSEvent) {
    super.mouseEntered(with: event)
    controller?.isHoveringHoverView = true
    controller?.hoverTimer?.invalidate()
  }

  override func mouseExited(with event: NSEvent) {
    super.mouseExited(with: event)
    controller?.isHoveringHoverView = false
    controller?.scheduleHideHoverView()
  }
}