/// <summary>
/// Resolves the intelligent billboard based on a set of provided parameters asynchronously.
/// </summary>
/// <param name="from">The first day of the first week of the set of weeks for which the intelligent billboard is to be calculated.</param>
/// <param name="numberOfWeeks">The number of weeks a billboard is to be calculated.</param>
/// <param name="numberOfBigRooms">The number of big rooms.</param>
/// <param name="numberOfSmallRooms">The number of small rooms.</param>
/// <param name="city">The city location.</param>
/// <returns>The intelligent billboard of recommendations for the set of weeks that corresponds to the provided parameters.</returns>
public async Task <IEnumerable <IntelligentBillboardRecommendation> > ResolveAsync(DateTime from, int numberOfWeeks, int numberOfBigRooms, int numberOfSmallRooms, string city)
{
IEnumerable <string> keywordIds = await GetKeywordIdsOfSuccessfulMoviesInCity(city);
var moviesAlreadyAssigned = new ConcurrentDictionary <string, byte>();
var result = new List <IntelligentBillboardRecommendation>();
var tasks = new List <Task>();
for (int index = 0; index < numberOfWeeks; index++)
{
var intelligentBillboardRecommendation = new IntelligentBillboardRecommendation();
intelligentBillboardRecommendation.WeekNumber = index + 1;
result.Add(intelligentBillboardRecommendation);
// We recommend movies that have been released during the last month.
DateTime localFrom = from.AddDays(-daysPerMonth + (daysPerWeek * index));
DateTime to = from.AddDays(daysPerWeek * index);
tasks.Add(GenerateBillboardsAsync(localFrom, to, keywordIds, numberOfBigRooms, numberOfSmallRooms, moviesAlreadyAssigned, intelligentBillboardRecommendation));
}
await Task.WhenAll(tasks);
return(result);
}
private async Task GenerateBillboardsAsync(DateTime from, DateTime to, IEnumerable <string> keywordIds, int numBigRooms, int numSmallRooms,
ConcurrentDictionary <string, byte> moviesAlreadyAssigned, IntelligentBillboardRecommendation intelligentBillboardRecommendation)
{
// Generate billboard for the small rooms.
var smallRoomsTask = GenerateBillboardAsync(from, to, _genresResolver.GetMinoritaryGenres(), keywordIds, numSmallRooms, moviesAlreadyAssigned);
// Generate billboard for the big rooms.
var bigRoomsTask = GenerateBillboardAsync(from, to, _genresResolver.GetBlockbusterGenres(), keywordIds, numBigRooms, moviesAlreadyAssigned);
await Task.WhenAll(smallRoomsTask, bigRoomsTask);
intelligentBillboardRecommendation.SmallRooms = await smallRoomsTask;
intelligentBillboardRecommendation.BigRooms = await bigRoomsTask;
}
