/*
  This is heavily based (read: copy pasted + some modifications) on Thekla's module 
  MacOS_Bundler.jai, released with the jai compiler. 
  
  For usage code, see package_macos_example.jai
  
  This routine creates a .app file with the following structure:
  
  output_path/
    Entitlements.xcent
    <output_name>.app/
      Contents/
        Info.plist
        MacOS/
          <output_name> <-- the executable, copied from args.exe_path
          ...copied in args.dynamic_libs
        Resources/
          icon_data.icns
          ...the contents of args.asset_directory
          
  
*/

#import "Basic";
#import "String";
#import "Process";
#import "File";
#import "Compiler";
#import "POSIX";
FU :: #import "File_Utilities";

Args :: struct
{
  exe_path: string;
  output_path: string;
  output_name: string;
  asset_directory: string;
  dynamic_libs: []string;
  icon_file_path: string;
  debug: bool;
};

package_for_macos :: (args: Args) -> error: bool 
{
  success := true;
  
  exe_name := path_filename(args.exe_path);
  exe_path := path_strip_filename(args.exe_path);
  
  app_bundle_name := tprint("%/%.app", args.output_path, args.output_name);
  resources_path := tprint("%/Contents/Resources", app_bundle_name);
  macos_path     := tprint("%/Contents/MacOS", app_bundle_name);
  
  { // Make Bundle Directories  
    success &= make_directory_if_it_does_not_exist(app_bundle_name, true);
    success &= make_directory_if_it_does_not_exist(tprint("%/Contents", app_bundle_name), true);
    success &= make_directory_if_it_does_not_exist(macos_path, true);
    success &= make_directory_if_it_does_not_exist(resources_path, true);
    if !success print("Unable to make directory structure\n");
  }

  // Copy Assets
  if success
  {
    if args.asset_directory
    {
      success = copy_directory(args.asset_directory, resources_path);
    }
    if !success print("Unable to copy asset_directory\n");
  }
  
  out_exe_path := sprint("%/%", macos_path, args.output_name);
  if success
  {
    success = copy_file(args.exe_path, out_exe_path);      
    chmod(temp_c_string(out_exe_path), 0x1FF); // add execute permissions
    if !success print("Unable to copy executable to %\n", out_exe_path);
  }
  
  // Copy Dynamic Libs
  if success 
  { 
    for args.dynamic_libs
    {
      basename := path_filename(it);
      dst := sprint("%/%", macos_path, basename);
      success = copy_file(it, dst);
    }
  }

  icon_data_file_name: string;
  if success  
  {
    if args.icon_file_path 
    {
      icon_data_file_name = "icon_data.icns";
      icns_output_path := tprint("%/%", resources_path, icon_data_file_name);
      success = convert_image_to_icns(args.icon_file_path, icns_output_path);
    }
  }
  
   // Write plist
  if success 
  {
    builder: String_Builder;

    plist_start(*builder, PLIST_HEADER);
    if icon_data_file_name {
        success := plist_write_key_value(*builder, "CFBundleIconFile", icon_data_file_name);
        assert(success);
    }
    plist_end(*builder);

    output := builder_to_string(*builder);
    success = write_entire_file(tprint("%/Contents/Info.plist", app_bundle_name), output);

    free(output);
  }

  // Write Entitlements
  if success 
  {
    builder: String_Builder;

    plist_start(*builder, ENTITLEMENTS_HEADER);
    
    if args.debug
    {
      plist_write_key_value(*builder, "com.apple.security.get-task-allow", true);
    }
    
    plist_end(*builder);

    output := builder_to_string(*builder);
    success = write_entire_file(tprint("%/Entitlements.xcent", args.output_path), output);

    free(output);
  }
  
  return !success;
}

convert_image_to_icns :: (input_path: string, output_path: string) -> bool 
{
  // @TODO verify if the input image is 128x128 256x256 or 512x512 and scale the image accordingly if not
  // or at least give an error
  process_result, output, error := run_command("sips", "-s", "format", "icns", input_path, "--out", output_path);
  return process_result.exit_code == 0;
}

///////////////////////////////////////////////////
// Plist Writing

plist_start :: (builder: *String_Builder, header: string) 
{
  append(builder, header);
  append(builder, "<plist>\n");
  append(builder, "<dict>\n");
}

plist_end :: (builder: *String_Builder) 
{
  append(builder, "</dict>\n");
  append(builder, "</plist>\n");
}

plist_write_key_value :: (builder: *String_Builder, key: string, value: Any) -> success: bool 
{
  plist_write_key(builder, key);

  if      (value.type.type == Type_Info_Tag.BOOL)   plist_write_bool(builder,   << cast(*bool)   value.value_pointer);
  else if (value.type.type == Type_Info_Tag.STRING) plist_write_string(builder, << cast(*string) value.value_pointer);
  else return false;

  return true;
}

plist_write_key :: (builder: *String_Builder, key: string) 
{
  append(builder, "<key>");
  append(builder, key);
  append(builder, "</key>");
}

plist_write_string :: (builder: *String_Builder, str: string) 
{
  append(builder, "<string>\n");
  append(builder, str);
  append(builder, "</string>\n");
}

plist_write_bool :: (builder: *String_Builder, value: bool) 
{
  print_to_builder(builder, "<%/>", value);
}

#scope_file

PLIST_HEADER :: #string DONE
<?xml version="1.0" ?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
DONE

ENTITLEMENTS_HEADER :: #string DONE
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
DONE

///////////////////////////////////////////////////////////////
// Utilities

copy_directory :: (from: string, to: string) -> success: bool
{
  User_Data :: struct {
    from: string;
    to: string;
    success: *bool;
  }
  
  success: bool = true;
  ud := User_Data.{
    from = from,
    to = to,
    success = *success,
  };
  
  visitor :: (info: *FU.File_Visit_Info, data: User_Data)
  {
    dest_name := advance(info.full_name, data.from.count);
    dest_name = concat(data.to, dest_name);
    if info.is_directory {
      << data.success &= make_directory_if_it_does_not_exist(dest_name);
    } else {
      << data.success &= copy_file(info.full_name, dest_name);
    }
  }

  FU.visit_files(from, true, ud, visitor, visit_directories = true);
  return success;
}

copy_file :: (from: string, to: string) -> success: bool
{
  success := false;

  data: string;
  data, success = read_entire_file(from);
  if success success = write_entire_file(to, data);
  return success;
}

concat :: (strings: .. string, separator: string = "") -> string 
{
  len := 0;
  for strings len += it.count;
  len += separator.count * (strings.count - 1);
  
  result := make_string(len);
  at := 0;
  for strings 
  {
    memcpy(result.data + at, it.data, it.count);
    if it_index < strings.count - 1 
    {
      memcpy(result.data + at + it.count, separator.data, separator.count);
    }
    at += it.count + separator.count;
  }
  
  return result;
}

make_string :: (count: int) -> string 
{
  assert(count >= 0);
  if !count return "";
  s: string = ---;
  s.data = alloc(count);
  s.count = count;
  return s;
}