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// 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
import Sparkle
import SwiftUI

@main
struct MapApp: App {

  private let updaterController: SPUStandardUpdaterController = SPUStandardUpdaterController(
    startingUpdater: true, updaterDelegate: nil, userDriverDelegate: nil)

  var body: some Scene {
    DocumentGroup(newDocument: MapDocument(text: nil)) { file in
      MapEditor(document: file.$document, url: file.fileURL)
        .focusedSceneValue(\.document, file.$document)
        .focusedSceneValue(\.fileURL, file.fileURL)
    }
    .windowToolbarStyle(.unifiedCompact)
    .commands {
      MapCommands()
      UpdateCommands(updaterController: updaterController)
    }

    Settings {
      PreferencesWindow()
    }
  }
}

struct LazyMapEditor: View {
  @Binding var document: MapDocument
  var url: URL?

  @FocusedBinding(\.document) var focusedDocument: MapDocument?
  @FocusedValue(\.fileURL) var focusedFileURL: URL?
  @State private var shouldRender = false
  @State private var renderTask: Task<Void, Never>?

  var isActiveDocument: Bool {
    guard let focusedDocument else { return false }
    // Use URL for identification if available, otherwise fall back to text comparison
    if let documentURL = url,
      let focusedURL = focusedFileURL
    {
      return documentURL == focusedURL
    }
    // For new documents without URLs, use text comparison as fallback
    return focusedDocument.text == document.text
  }

  var body: some View {
    if isActiveDocument {
      MapEditor(document: $document, url: url)
    } else {
      Rectangle()
        .fill(Color(NSColor.windowBackgroundColor))
        .overlay(
          VStack(spacing: 16) {
            Text("document.inactive")
              .font(.title2)
              .foregroundColor(.secondary)
            if let url = url {
              Text(url.lastPathComponent)
                .font(.caption)
                .foregroundColor(.secondary)
            }
          }
        )
    }
  }
}