using FastEndpoints;
using Microsoft.EntityFrameworkCore;
using Socialize.Api.Data;
using Socialize.Api.Infrastructure.Security;
using Socialize.Api.Modules.ReleaseCommunications.Contracts;
using Socialize.Api.Modules.ReleaseCommunications.Data;
using Socialize.Api.Modules.ReleaseCommunications.Services;

namespace Socialize.Api.Modules.ReleaseCommunications.Handlers;

internal class GetUnreadReleaseUpdatesHandler(AppDbContext dbContext)
    : EndpointWithoutRequest<ReleaseUpdateUnreadSummaryDto>
{
    public override void Configure()
    {
        Get("/api/release-updates/unread");
        Options(o => o.WithTags("Release Communications"));
    }

    public override async Task HandleAsync(CancellationToken ct)
    {
        Guid userId = User.GetUserId();
        ReleaseUpdateAudienceContext audienceContext =
            await ReleaseUpdateVisibility.GetAudienceContextAsync(dbContext, User, userId, ct);

        List<ReleaseUpdate> unreadUpdates = await dbContext.ReleaseUpdates
            .VisibleTo(audienceContext)
            .Where(update => !dbContext.ReleaseUpdateReadReceipts.Any(receipt =>
                receipt.ReleaseUpdateId == update.Id &&
                receipt.UserId == userId))
            .OrderByDescending(update => update.PublishedAt)
            .ThenByDescending(update => update.CreatedAt)
            .ToListAsync(ct);

        await SendOkAsync(
            new ReleaseUpdateUnreadSummaryDto(
                unreadUpdates.Count,
                unreadUpdates.Count(update => update.Importance == ReleaseUpdateImportance.Important),
                unreadUpdates.Select(update => update.ToDto(false)).ToArray()),
            ct);
    }
}