Search a recipe

private async Task SearchRecipe()
{
    await GUIOutput("What do you want to cook?", true);
    SpeechRecognitionResult food = await task_recognizer.RecognizeAsync();
    await GUIOutput("Searching a recipe for " + food.Text, false);

    try
    {
        var http = new HttpClient();
        var response = await http.GetAsync("https://api.edamam.com/search?q=" + food.Text + "&app_id=b4a3fd65&app_key=64c81e2e1ae114c948f814fc9c31041f&from=0&to=1");
        string recipe = await response.Content.ReadAsStringAsync();
        int idx1 = recipe.IndexOf("\"ingredientLines\" : [ \"") + "\"ingredientLines\" : [ \"".Length;
        int idx2 = recipe.IndexOf("\"ingredients\"") - 11;
        string ingredients = recipe.Substring(idx1, idx2 - idx1);
        ingredients = ingredients.Replace("\", \"", ";");
        var ingredients_list = ingredients.Split(';');

        idx1 = recipe.IndexOf("\"label\" : \"") + "\"label\" : \"".Length;
        idx2 = recipe.IndexOf("\"image\"") - 9;
        string recipe_name = recipe.Substring(idx1, idx2 - idx1);

        idx1 = recipe.IndexOf("\"image\" : \"") + "\"image\" : \"".Length;
        idx2 = recipe.IndexOf("\"source\"") - 9;
        string recipe_photo = recipe.Substring(idx1, idx2 - idx1);

        await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                                () =>
                                {
                                    main_page.SwitchToRecipeGrid();
                                    main_page.SetRecipeName(recipe_name);
                                    main_page.SetRecipePhoto(recipe_photo);
                                    main_page.SetRecipeIngredients(ingredients_list);
                                });

        // Stay in the recipe grid until the user clicks the exit button
        in_recipe_view = true;
        while(in_recipe_view);

        await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                                () =>
                                {
                                    main_page.SwitchToDefaultGrid();
                                });
    }
    catch
    {
        await GUIOutput("I'm sorry, I couldn't retrieve the informations from the web.", true);
    }

    state = AssistantState.BACKGROUND_DEFAULT;
}

// Handles return to default grid from recipe grid
public void RecipeGridToDefaultGrid() { in_recipe_view = false; }