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namespace IOL.GreatOffice.Api.Endpoints.V1.Entries;

public class EntryQueryRoute : RouteBaseSync.WithRequest<EntryQueryPayload>.WithActionResult<EntryQueryResponse>
{
	private readonly ILogger<EntryQueryRoute> _logger;
	private readonly AppDbContext _context;

	public EntryQueryRoute(ILogger<EntryQueryRoute> logger, AppDbContext context) {
		_logger = logger;
		_context = context;
	}

	/// <summary>
	/// Get a list of entries based on a given query.
	/// </summary>
	/// <param name="entryQuery"></param>
	/// <returns></returns>
	/// <exception cref="ArgumentOutOfRangeException"></exception>
	[ApiVersion(ApiSpecV1.VERSION_STRING)]
	[BasicAuthentication(AppConstants.TOKEN_ALLOW_READ)]
	[HttpPost("~/v{version:apiVersion}/entries/query")]
	[ProducesResponseType(204)]
	[ProducesResponseType(400, Type = typeof(ErrorResult))]
	[ProducesResponseType(200, Type = typeof(EntryQueryResponse))]
	public override ActionResult<EntryQueryResponse> Handle(EntryQueryPayload entryQuery) {
		var result = new TimeQueryDto();

		Request.Headers.TryGetValue(AppHeaders.BROWSER_TIME_ZONE, out var timeZoneHeader);
		var tz = TimeZoneInfo.FindSystemTimeZoneById(timeZoneHeader.ToString().HasValue() ? timeZoneHeader.ToString() : "UTC");
		var offsetInHours = tz.BaseUtcOffset.Hours;

		// this is fine as long as the client is not connecting from Australia: Lord Howe Island
		// according to https://en.wikipedia.org/wiki/Daylight_saving_time_by_country
		if (tz.IsDaylightSavingTime(AppDateTime.UtcNow)) {
			offsetInHours++;
		}

		_logger.LogInformation("Request time zone (" + tz.Id + ") offset is: " + offsetInHours + " hours");
		var requestDateTime = TimeZoneInfo.ConvertTimeFromUtc(AppDateTime.UtcNow, tz);
		_logger.LogInformation("Querying data with date time: " + requestDateTime.ToString("u"));

		var skipCount = 0;
		if (entryQuery.Page > 1) {
			skipCount = entryQuery.PageSize * entryQuery.Page;
		}

		result.Page = entryQuery.Page;
		result.PageSize = entryQuery.PageSize;

		var baseQuery = _context.TimeEntries
								.AsNoTracking()
								.Include(c => c.Category)
								.Include(c => c.Labels)
								.Where(c => c.UserId == LoggedInUser.Id)
								.ConditionalWhere(entryQuery.Categories?.Any() ?? false, c => entryQuery.Categories.Any(p => p.Id == c.Category.Id))
								.ConditionalWhere(entryQuery.Labels?.Any() ?? false, c => c.Labels.Any(l => entryQuery.Labels.Any(p => p.Id == l.Id)))
								.OrderByDescending(c => c.Start);

		switch (entryQuery.Duration) {
			case TimeEntryQueryDuration.TODAY:
				var baseTodaysEntries = baseQuery
						.Where(c => DateTime.Compare(c.Start.AddHours(offsetInHours).Date, AppDateTime.UtcNow.Date) == 0);
				var baseTodaysEntriesCount = baseTodaysEntries.Count();

				if (baseTodaysEntriesCount == 0) {
					return NoContent();
				}

				result.TotalSize = baseTodaysEntriesCount;
				result.TotalPageCount = Convert.ToInt32(Math.Round((double)baseTodaysEntriesCount / entryQuery.PageSize));

				var pagedTodaysEntries = baseTodaysEntries.Skip(skipCount).Take(entryQuery.PageSize);

				result.Results.AddRange(pagedTodaysEntries.Select(c => c.AsDto));
				break;
			case TimeEntryQueryDuration.THIS_WEEK:
				var lastMonday = AppDateTime.UtcNow.StartOfWeek(DayOfWeek.Monday);

				var baseEntriesThisWeek = baseQuery
						.Where(c => c.Start.AddHours(offsetInHours).Date >= lastMonday.Date && c.Start.AddHours(offsetInHours).Date <= AppDateTime.UtcNow.Date);

				var baseEntriesThisWeekCount = baseEntriesThisWeek.Count();

				if (baseEntriesThisWeekCount == 0) {
					return NoContent();
				}

				result.TotalSize = baseEntriesThisWeekCount;
				result.TotalPageCount = Convert.ToInt32(Math.Round((double)baseEntriesThisWeekCount / entryQuery.PageSize));

				var pagedEntriesThisWeek = baseEntriesThisWeek.Skip(skipCount).Take(entryQuery.PageSize);

				result.Results.AddRange(pagedEntriesThisWeek.Select(c => c.AsDto));
				break;
			case TimeEntryQueryDuration.THIS_MONTH:
				var baseEntriesThisMonth = baseQuery
						.Where(c => c.Start.AddHours(offsetInHours).Month == AppDateTime.UtcNow.Month
									&& c.Start.AddHours(offsetInHours).Year == AppDateTime.UtcNow.Year);
				var baseEntriesThisMonthCount = baseEntriesThisMonth.Count();
				if (baseEntriesThisMonthCount == 0) {
					return NoContent();
				}

				result.TotalSize = baseEntriesThisMonthCount;
				result.TotalPageCount = Convert.ToInt32(Math.Round((double)baseEntriesThisMonthCount / entryQuery.PageSize));

				var pagedEntriesThisMonth = baseEntriesThisMonth.Skip(skipCount).Take(entryQuery.PageSize);

				result.Results.AddRange(pagedEntriesThisMonth.Select(c => c.AsDto));
				break;
			case TimeEntryQueryDuration.THIS_YEAR:
				var baseEntriesThisYear = baseQuery
						.Where(c => c.Start.AddHours(offsetInHours).Year == AppDateTime.UtcNow.Year);

				var baseEntriesThisYearCount = baseEntriesThisYear.Count();
				if (baseEntriesThisYearCount == 0) {
					return NoContent();
				}

				result.TotalSize = baseEntriesThisYearCount;
				result.TotalPageCount = Convert.ToInt32(Math.Round((double)baseEntriesThisYearCount / entryQuery.PageSize));

				var pagedEntriesThisYear = baseEntriesThisYear.Skip(skipCount).Take(entryQuery.PageSize);

				result.Results.AddRange(pagedEntriesThisYear.Select(c => c.AsDto));
				break;
			case TimeEntryQueryDuration.SPECIFIC_DATE:
				var date = DateTime.SpecifyKind(entryQuery.SpecificDate, DateTimeKind.Utc);
				var baseEntriesOnThisDate = baseQuery.Where(c => c.Start.AddHours(offsetInHours).Date == date.Date);
				var baseEntriesOnThisDateCount = baseEntriesOnThisDate.Count();

				if (baseEntriesOnThisDateCount == 0) {
					return NoContent();
				}

				result.TotalSize = baseEntriesOnThisDateCount;
				result.TotalPageCount = Convert.ToInt32(Math.Round((double)baseEntriesOnThisDateCount / entryQuery.PageSize));

				var pagedEntriesOnThisDate = baseEntriesOnThisDate.Skip(skipCount).Take(entryQuery.PageSize);

				result.Results.AddRange(pagedEntriesOnThisDate.Select(c => c.AsDto));
				break;
			case TimeEntryQueryDuration.DATE_RANGE:
				if (entryQuery.DateRange.From == default) {
					return BadRequest(new ErrorResult("Invalid query", "From date cannot be empty"));
				}

				var fromDate = DateTime.SpecifyKind(entryQuery.DateRange.From, DateTimeKind.Utc);

				if (entryQuery.DateRange.To == default) {
					return BadRequest(new ErrorResult("Invalid query", "To date cannot be empty"));
				}

				var toDate = DateTime.SpecifyKind(entryQuery.DateRange.To, DateTimeKind.Utc);

				if (DateTime.Compare(fromDate, toDate) > 0) {
					return BadRequest(new ErrorResult("Invalid query", "To date cannot be less than From date"));
				}

				var baseDateRangeEntries = baseQuery
						.Where(c => c.Start.AddHours(offsetInHours).Date > fromDate && c.Start.AddHours(offsetInHours).Date <= toDate);

				var baseDateRangeEntriesCount = baseDateRangeEntries.Count();
				if (baseDateRangeEntriesCount == 0) {
					return NoContent();
				}

				result.TotalSize = baseDateRangeEntriesCount;
				result.TotalPageCount = Convert.ToInt32(Math.Round((double)baseDateRangeEntriesCount / entryQuery.PageSize));

				var pagedDateRangeEntries = baseDateRangeEntries.Skip(skipCount).Take(entryQuery.PageSize);

				result.Results.AddRange(pagedDateRangeEntries.Select(c => c.AsDto));
				break;
			default:
				throw new ArgumentOutOfRangeException(nameof(entryQuery), "Unknown duration for query");
		}

		if (result.Results.Any() && result.Page == 0) {
			result.Page = 1;
			result.TotalPageCount = 1;
		}

		return Ok(result);
	}
}