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# Copyright 2025, Dylan T. Mitchell-Funk
#
# This software is provided "as is", without warranty of any kind, express or
# implied, including but not limited to the warranties of merchantability,
# fitness for a particular purpose and noninfringement. In no event shall the
# authors or copyright holders be liable for any claim, damages or other
# liability, whether in an action of contract, tort or otherwise, arising from,
# out of or in connection with the software or the use or other dealings in
# the software.

require 'sketchup.rb'

#=============================================================================
# This module encapsulates the exporter functionality to prevent conflicts with
# other extensions.
#
module CGE_X3D_Exporter

  #===========================================================================
  # The core logic for the export and conversion process.
  #
  def self.export_to_x3d
    # --- 1. Get the active model and define file paths ---
    model = Sketchup.active_model
    model_path = model.path

    # The model must be saved first to establish a base path for exports.
    if model_path.empty?
      UI.messagebox('Please save your model before exporting to X3D.')
      return
    end

    # Check for SketchUp Pro, as VRML export is a Pro-only feature.
    unless Sketchup.is_pro?
      UI.messagebox('VRML export is a SketchUp Pro feature. This extension cannot proceed.')
      return
    end

    # Define paths based on the saved model's location and name.
    dir = File.dirname(model_path)
    basename = File.basename(model_path, '.skp')
    wrl_path = File.join(dir, "#{basename}.wrl")
    x3d_path = File.join(dir, "#{basename}.x3d")

    # --- 2. Define the path to the conversion utility ---
    # This is the hardcoded path to your Castle Game Engine executable.
    # If you move the engine, you must update this path.
    converter_path = "/Applications/castle-engine/bin/castle-model-viewer.app/Contents/MacOS/castle-model-viewer"

    # Verify that the converter executable actually exists at the specified path.
    unless File.exist?(converter_path)
      UI.messagebox("Conversion tool not found at:\n#{converter_path}\n\nPlease check your Castle Game Engine installation path.")
      return
    end

    # --- 3. Export the model to VRML (.wrl) ---
    # SketchUp's export method infers the format from the file extension.
    # This will create the .wrl file and a folder with textures if they exist.
    begin
      puts "Exporting to VRML: #{wrl_path}"
      export_status = model.export(wrl_path)
      unless export_status
        UI.messagebox("Failed to export model to VRML file.")
        return
      end
    rescue => e
      UI.messagebox("An error occurred during VRML export:\n#{e.message}")
      return
    end


    # --- 4. Construct and execute the conversion command ---
    # The command is built using the paths defined above.
    # "castle-model-viewer ... --write --write-encoding xml > output.x3d"
    # Using %Q{} allows for clean handling of paths that may contain spaces.
    command = %Q{ "#{converter_path}" "#{wrl_path}" --write --write-encoding xml > "#{x3d_path}" }

    puts "Executing conversion command:"
    puts command

    # Execute the command in the system's shell.
    # The `system` command returns `true` on success, `false` on failure,
    # or `nil` if the command could not be executed.
    conversion_status = system(command)

    # --- 5. Provide feedback to the user ---
    if conversion_status
      UI.messagebox("Successfully exported and converted to:\n#{x3d_path}")
    # Optional: Open the containing folder after successful export.
    # system("open \"#{dir}\"")
    else
      UI.messagebox("The conversion to X3D failed. Please check the Ruby Console for more details.")
      puts "Conversion command failed. This could be an issue with Castle Game Engine or the exported VRML file."
    end

    # The intermediate .wrl file is kept for debugging purposes.

  end # def self.export_to_x3d

  #===========================================================================
  # This block runs once when the script is loaded. It creates the menu item.
  #
  unless file_loaded?(__FILE__)
    # Get the "File" menu. You could also use "Extensions".
    menu = UI.menu('File')
    # Add a separator and our menu item.
    menu.add_separator
    menu.add_item('Export to X3D (via CGE)') {
      self.export_to_x3d
    }
    file_loaded(__FILE__)
  end

end # module CGE_X3D_Exporter