// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "printing/backend/print_backend.h"

#include "base/logging.h"
#include "base/values.h"
#include "printing/backend/print_backend_consts.h"
#include "url/gurl.h"

#if defined(USE_CUPS)
#include "base/memory/ptr_util.h"
#include "printing/backend/print_backend_cups_ipp.h"
#endif  // defined(USE_CUPS)

namespace printing {

// Provides either a stubbed out PrintBackend implementation or a CUPS IPP
// implementation for use on ChromeOS.
class PrintBackendChromeOS : public PrintBackend {
 public:
  PrintBackendChromeOS();

  // PrintBackend implementation.
  bool EnumeratePrinters(PrinterList* printer_list) override;
  std::string GetDefaultPrinterName() override;
  bool GetPrinterBasicInfo(const std::string& printer_name,
                           PrinterBasicInfo* printer_info) override;
  bool GetPrinterSemanticCapsAndDefaults(
      const std::string& printer_name,
      PrinterSemanticCapsAndDefaults* printer_info) override;
  bool GetPrinterCapsAndDefaults(const std::string& printer_name,
                                 PrinterCapsAndDefaults* printer_info) override;
  std::string GetPrinterDriverInfo(const std::string& printer_name) override;
  bool IsValidPrinter(const std::string& printer_name) override;

 protected:
  ~PrintBackendChromeOS() override {}
};

PrintBackendChromeOS::PrintBackendChromeOS() {}

bool PrintBackendChromeOS::EnumeratePrinters(PrinterList* printer_list) {
  return true;
}

bool PrintBackendChromeOS::GetPrinterBasicInfo(const std::string& printer_name,
                                               PrinterBasicInfo* printer_info) {
  return false;
}

bool PrintBackendChromeOS::GetPrinterSemanticCapsAndDefaults(
    const std::string& printer_name,
    PrinterSemanticCapsAndDefaults* printer_info) {
  NOTREACHED();
  return false;
}

bool PrintBackendChromeOS::GetPrinterCapsAndDefaults(
    const std::string& printer_name,
    PrinterCapsAndDefaults* printer_info) {
  NOTREACHED();
  return false;
}

std::string PrintBackendChromeOS::GetPrinterDriverInfo(
    const std::string& printer_name) {
  NOTREACHED();
  return std::string();
}

std::string PrintBackendChromeOS::GetDefaultPrinterName() {
  return std::string();
}

bool PrintBackendChromeOS::IsValidPrinter(const std::string& printer_name) {
  NOTREACHED();
  return true;
}

// static
scoped_refptr<PrintBackend> PrintBackend::CreateInstanceImpl(
    const base::DictionaryValue* print_backend_settings) {
  if (GetNativeCupsEnabled()) {
#if defined(USE_CUPS)
    std::string print_server_url_str;
    std::string cups_blocking;
    int encryption = HTTP_ENCRYPT_NEVER;
    if (print_backend_settings) {
      print_backend_settings->GetString(kCUPSPrintServerURL,
                                        &print_server_url_str);

      print_backend_settings->GetString(kCUPSBlocking, &cups_blocking);

      print_backend_settings->GetInteger(kCUPSEncryption, &encryption);
    }
    GURL print_server_url(print_server_url_str);

    std::unique_ptr<CupsConnection> connection =
        base::MakeUnique<CupsConnection>(
            print_server_url, static_cast<http_encryption_t>(encryption),
            cups_blocking == kValueTrue);

    return new PrintBackendCupsIpp(std::move(connection));
#endif  // defined(USE_CUPS)
  }

  return new PrintBackendChromeOS();
}

}  // namespace printing