// 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.

#ifndef CHROME_BROWSER_WEBSHARE_SHARE_SERVICE_IMPL_H_
#define CHROME_BROWSER_WEBSHARE_SHARE_SERVICE_IMPL_H_

#include <memory>
#include <string>
#include <vector>

#include "base/gtest_prod_util.h"
#include "base/strings/string16.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_dialogs.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "third_party/WebKit/public/platform/modules/webshare/webshare.mojom.h"
#include "third_party/WebKit/public/platform/site_engagement.mojom.h"

class DictionaryValue;
class GURL;

// Desktop implementation of the ShareService Mojo service.
class ShareServiceImpl : public blink::mojom::ShareService {
 public:
  ShareServiceImpl();
  ~ShareServiceImpl() override;

  static void Create(mojo::InterfaceRequest<ShareService> request);

  // blink::mojom::ShareService overrides:
  void Share(const std::string& title,
             const std::string& text,
             const GURL& share_url,
             const ShareCallback& callback) override;

 private:
  FRIEND_TEST_ALL_PREFIXES(ShareServiceImplUnittest, ReplacePlaceholders);

  Browser* GetBrowser();

  // Returns the URL template of the target identified by |target_url|
  std::string GetTargetTemplate(const std::string& target_url,
                                const base::DictionaryValue& share_targets);

  // Virtual for testing purposes.
  virtual PrefService* GetPrefService();

  // Returns the site engagement level of the site, |url|, with the user.
  // Virtual for testing purposes.
  virtual blink::mojom::EngagementLevel GetEngagementLevel(const GURL& url);

  // Shows the share picker dialog with |targets| as the list of applications
  // presented to the user. Passes the result to |callback|. If the user picks a
  // target, the result passed to |callback| is the manifest URL of the chosen
  // target, or is null if the user cancelled the share. Virtual for testing.
  virtual void ShowPickerDialog(
      const std::vector<std::pair<base::string16, GURL>>& targets,
      const base::Callback<void(base::Optional<std::string>)>& callback);

  // Opens a new tab and navigates to |target_url|.
  // Virtual for testing purposes.
  virtual void OpenTargetURL(const GURL& target_url);

  // Returns all stored Share Targets that have a high enough engagement score
  // with the user.
  std::vector<std::pair<base::string16, GURL>>
  GetTargetsWithSufficientEngagement(
      const base::DictionaryValue& share_targets);

  // Writes to |url_template_filled|, a copy of |url_template| with all
  // instances of "{title}", "{text}", and "{url}" replaced with
  // |title|, |text|, and |url| respectively.
  // Replaces instances of "{X}" where "X" is any string besides "title",
  // "text", and "url", with an empty string, for forwards compatibility.
  // Returns false, if there are badly nested placeholders.
  // This includes any case in which two "{" occur before a "}", or a "}"
  // occurs with no preceding "{".
  static bool ReplacePlaceholders(base::StringPiece url_template,
                                  base::StringPiece title,
                                  base::StringPiece text,
                                  const GURL& share_url,
                                  std::string* url_template_filled);

  void OnPickerClosed(std::unique_ptr<base::DictionaryValue> share_targets,
                      const std::string& title,
                      const std::string& text,
                      const GURL& share_url,
                      const ShareCallback& callback,
                      base::Optional<std::string> result);

  DISALLOW_COPY_AND_ASSIGN(ShareServiceImpl);
};

#endif  // CHROME_BROWSER_WEBSHARE_SHARE_SERVICE_IMPL_H_