// Copyright 2014 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 "ios/web/webui/shared_resources_data_source_ios.h"

#include "base/logging.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_util.h"
#include "grit/webui_resources_map.h"
#include "ios/web/public/web_client.h"
#include "net/base/mime_util.h"
#include "ui/base/webui/web_ui_util.h"
#include "ui/resources/grit/webui_resources.h"

namespace web {

namespace {

// Value duplicated from content/public/common/url_constants.h
// TODO(stuartmorgan): Revisit how to share this in a more maintainable way.
const char kWebUIResourcesHost[] = "resources";

int PathToIDR(const std::string& path) {
  int idr = -1;
  for (size_t i = 0; i < kWebuiResourcesSize; ++i) {
    if (path == kWebuiResources[i].name) {
      idr = kWebuiResources[i].value;
      break;
    }
  }

  return idr;
}

}  // namespace

SharedResourcesDataSourceIOS::SharedResourcesDataSourceIOS() {
}

SharedResourcesDataSourceIOS::~SharedResourcesDataSourceIOS() {
}

std::string SharedResourcesDataSourceIOS::GetSource() const {
  return kWebUIResourcesHost;
}

void SharedResourcesDataSourceIOS::StartDataRequest(
    const std::string& path,
    const URLDataSourceIOS::GotDataCallback& callback) {
  int idr = PathToIDR(path);
  DCHECK_NE(-1, idr) << " path: " << path;
  scoped_refptr<base::RefCountedMemory> bytes;

  WebClient* web_client = GetWebClient();

  if (idr == IDR_WEBUI_CSS_TEXT_DEFAULTS) {
    std::vector<std::string> placeholders;
    placeholders.push_back(webui::GetTextDirection());  // $1
    placeholders.push_back(webui::GetFontFamily());  // $2
    placeholders.push_back(webui::GetFontSize());  // $3

    const std::string& chrome_shared =
        web_client->GetDataResource(idr, ui::SCALE_FACTOR_NONE).as_string();
    std::string replaced =
        base::ReplaceStringPlaceholders(chrome_shared, placeholders, nullptr);
    bytes = base::RefCountedString::TakeString(&replaced);
  } else {
    bytes = web_client->GetDataResourceBytes(idr);
  }

  callback.Run(bytes.get());
}

std::string SharedResourcesDataSourceIOS::GetMimeType(
    const std::string& path) const {
  std::string mime_type;
  net::GetMimeTypeFromFile(base::FilePath().AppendASCII(path), &mime_type);
  return mime_type;
}

}  // namespace web