/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 2; tab-width: 2 -*-  */
/*
 * libgfbgraph - GObject library for Facebook Graph API
 * Copyright (C) 2013-2015 Álvaro Peña <alvaropg@gmail.com>
 *               2019-2020 Leesoo Ahn <yisooan@fedoraproject.org>
 *
 * GFBGraph is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * GFBGraph is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with GFBGraph.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <glib.h>
#include <json-glib/json-glib.h>
#include <rest/rest-proxy.h>
#include <string.h>

#include <gfbgraph/gfbgraph.h>
#include <gfbgraph/gfbgraph-simple-authorizer.h>

/* #include "config.h" */

typedef struct _GFBGraphTestFixture GFBGraphTestFixture;
typedef struct _GFBGraphTestApp     GFBGraphTestApp;

struct _GFBGraphTestFixture
{
  gchar *user_id;
  gchar *user_email;

  GFBGraphSimpleAuthorizer *authorizer;
};

struct _GFBGraphTestApp
{
  gchar *client_id;
  gchar *client_secret;
  gchar *access_token;
};

#define FACEBOOK_ENDPOINT "https://graph.facebook.com/v2.10"

#define FACEBOOK_TEST_USER_PERMISSIONS "email,user_about_me,user_photos,publish_actions"

GFBGraphTestApp*
gfbgraph_test_app_setup (void)
{
  GFBGraphTestApp *app;
  RestProxy *proxy;
  RestProxyCall *rest_call;
  g_autofree gchar *function_path = NULL;
  g_autofree gchar *app_key_filename = NULL;
  g_autoptr(GError) error = NULL;
  g_autoptr(GKeyFile) app_key_file = NULL;
  g_autoptr(JsonParser) jparser = NULL;
  g_autoptr(JsonReader) jreader = NULL;
  JsonNode *jnode;
  const char *payload;

  app_key_filename = g_test_build_filename (G_TEST_BUILT,
      "credentials.ini",
      NULL);
  app_key_file = g_key_file_new ();
  g_key_file_load_from_file (app_key_file,
      app_key_filename,
      G_KEY_FILE_NONE,
      &error);
  g_assert_no_error(error);

  app = g_new0(GFBGraphTestApp, 1);

  app->client_id = g_key_file_get_string (app_key_file,
      "Client",
      "ClientId",
      &error);
  g_assert_no_error(error);
  app->client_secret = g_key_file_get_string (app_key_file,
      "Client",
      "ClientSecret",
      &error);
  g_assert_no_error(error);

  proxy = rest_proxy_new (FACEBOOK_ENDPOINT, FALSE);
  rest_call = rest_proxy_new_call (proxy);

  rest_proxy_call_add_param (rest_call, "client_id", app->client_id);
  rest_proxy_call_add_param (rest_call, "client_secret", app->client_secret);
  rest_proxy_call_add_param (rest_call, "grant_type", "client_credentials");

  rest_proxy_call_set_method (rest_call, "GET");
  function_path = g_strdup ("/oauth/access_token");
  rest_proxy_call_set_function (rest_call, function_path);

  rest_proxy_call_sync (rest_call, &error);
  g_assert_no_error (error);

  payload = rest_proxy_call_get_payload (rest_call);
  jparser = json_parser_new ();
  json_parser_load_from_data (jparser, payload, -1, &error);
  g_assert_no_error (error);
  jnode = json_parser_get_root (jparser);
  jreader = json_reader_new (jnode);
  json_reader_read_element (jreader, 0);
  app->access_token = g_strdup(json_reader_get_string_value (jreader));
  json_reader_end_element (jreader);

  g_clear_object(&rest_call);
  g_clear_object(&proxy);

  return app;
}

void
gfbgraph_test_fixture_setup (GFBGraphTestFixture *fixture, gconstpointer user_data)
{
  RestProxy *proxy;
  RestProxyCall *rest_call;
  g_autofree gchar *function_path = NULL;
  const gchar *payload;
  g_autoptr(GError) error = NULL;
  const GFBGraphTestApp *app = user_data;
  JsonNode *jnode;
  g_autoptr(JsonParser) jparser = NULL;
  g_autoptr(JsonReader) jreader = NULL;
  const gchar *access_token;

  /* Create a new user */

  proxy = rest_proxy_new (FACEBOOK_ENDPOINT, FALSE);
  rest_call = rest_proxy_new_call (proxy);

  /* Params as documented here: https://developers.facebook.com/docs/graph-api/reference/app/accounts/test-users#publish */
  rest_proxy_call_add_param (rest_call, "installed", "true");
  rest_proxy_call_add_param (rest_call, "permissions", FACEBOOK_TEST_USER_PERMISSIONS);
  rest_proxy_call_add_param (rest_call, "access_token", app->access_token);

  rest_proxy_call_set_method (rest_call, "POST");
  function_path = g_strdup_printf ("%s/accounts/test-users", app->client_id);
  rest_proxy_call_set_function (rest_call, function_path);

  rest_proxy_call_sync (rest_call, &error);
  g_assert_no_error (error);

  payload = rest_proxy_call_get_payload (rest_call);
  jparser = json_parser_new ();
  json_parser_load_from_data (jparser, payload, -1, &error);
  g_assert_no_error (error);
  jnode = json_parser_get_root (jparser);
  jreader = json_reader_new (jnode);

  json_reader_read_element (jreader, 0);
  fixture->user_id = g_strdup (json_reader_get_string_value (jreader));
  json_reader_end_element (jreader);
  json_reader_read_element (jreader, 1);
  access_token = json_reader_get_string_value (jreader);
  json_reader_end_element (jreader);
  json_reader_read_element (jreader, 3);
  fixture->user_email = g_strdup (json_reader_get_string_value (jreader));
  json_reader_end_element (jreader);

  fixture->authorizer = gfbgraph_simple_authorizer_new (access_token);

  g_clear_object (&rest_call);
  g_clear_object (&proxy);

}

static void
gfbgraph_test_fixture_teardown (GFBGraphTestFixture *fixture, G_GNUC_UNUSED gconstpointer user_data)
{
  g_autoptr(SoupSession) ssession = NULL;
  g_autoptr(SoupMessage) smessage = NULL;
  g_autofree gchar *function_path = NULL;
  guint status;

  /* Delete the test user and clean up memory */

  ssession = soup_session_new ();

  function_path = g_strdup_printf ("%s/%s", FACEBOOK_ENDPOINT, fixture->user_id);
  smessage = soup_message_new ("DELETE", function_path);
  gfbgraph_authorizer_process_message (GFBGRAPH_AUTHORIZER (fixture->authorizer), smessage);

  status = soup_session_send_message (ssession, smessage);
  g_assert_cmpint(status, ==, 200);

  g_free (fixture->user_id);
  g_free (fixture->user_email);
  g_object_unref (fixture->authorizer);
}

static void
gfbgraph_test_me (GFBGraphTestFixture *fixture, G_GNUC_UNUSED gconstpointer user_data)
{
  g_autoptr(GFBGraphUser) me = NULL;
  g_autoptr(GError) error = NULL;

  me = gfbgraph_user_get_me (GFBGRAPH_AUTHORIZER (fixture->authorizer), &error);
  g_assert_no_error (error);
  g_assert (GFBGRAPH_IS_USER (me));

  g_assert_cmpstr (fixture->user_id, ==, gfbgraph_node_get_id (GFBGRAPH_NODE (me)));
  g_assert_cmpstr (fixture->user_email, ==, gfbgraph_user_get_email (me));
}

static G_GNUC_UNUSED void
gfbgraph_test_album (GFBGraphTestFixture *fixture, G_GNUC_UNUSED gconstpointer user_data)
{
  GFBGraphUser *me;
  GFBGraphAlbum *album;
  GError *error = NULL;
  gboolean result;

  me = gfbgraph_user_get_me (GFBGRAPH_AUTHORIZER (fixture->authorizer), &error);
  g_assert_no_error (error);
  g_assert (GFBGRAPH_IS_USER (me));

  /* Create a photo album */
  album = gfbgraph_album_new ();
  gfbgraph_album_set_name (album, "Vanilla Sky");
  gfbgraph_album_set_description (album, "Great sunset photos in Mars!");
  result = gfbgraph_node_append_connection (GFBGRAPH_NODE (me),
      GFBGRAPH_NODE (album),
      GFBGRAPH_AUTHORIZER (fixture->authorizer),
      &error);
  /* Asserting the connection */
  g_assert_no_error (error);
  g_assert (result);

  /* Asserting the Album ID */
  g_assert_cmpstr (gfbgraph_node_get_id (GFBGRAPH_NODE (album)), !=, "");
}

int
main (int argc, char **argv)
{
  GFBGraphTestApp *app = NULL;
  int test_result;

  g_test_init (&argc, &argv, NULL);

  g_log_set_always_fatal (G_LOG_LEVEL_ERROR | G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL | G_LOG_LEVEL_CRITICAL);

  app = gfbgraph_test_app_setup ();

  g_test_add ("/GFBGraph/Me",
      GFBGraphTestFixture,
      app,
      gfbgraph_test_fixture_setup,
      gfbgraph_test_me,
      gfbgraph_test_fixture_teardown);

#if 0
  g_test_add ("/GFBGraph/Album",
      GFBGraphTestFixture,
      app,
      gfbgraph_test_fixture_setup,
      gfbgraph_test_album,
      gfbgraph_test_fixture_teardown);
#endif

  test_result = g_test_run ();

  if (app) {
    if (app->client_id)
      g_free (app->client_id);
    if (app->client_secret)
      g_free (app->client_secret);
    if (app->access_token)
      g_free (app->access_token);
    g_free (app);
  }

  return test_result;
}