using FastEndpoints;
using Microsoft.EntityFrameworkCore;
using Socialize.Api.Data;
using Socialize.Api.Infrastructure.BlobStorage.Contracts;
using Socialize.Api.Infrastructure.Security;
using Socialize.Api.Modules.Feedback.Data;
using Socialize.Api.Modules.Feedback.Services;
using Socialize.Api.Modules.Identity.Contracts;

namespace Socialize.Api.Modules.Feedback.Handlers;

public class GetFeedbackScreenshotHandler(
    AppDbContext dbContext,
    IBlobStorage blobStorage)
    : EndpointWithoutRequest<Stream>
{
    public override void Configure()
    {
        Get("/api/feedback/{id}/screenshot");
        Options(o => o.WithTags("Feedback"));
    }

    public override async Task HandleAsync(CancellationToken ct)
    {
        Guid id = Route<Guid>("id");
        Guid userId = User.GetUserId();

        FeedbackReport? report = await dbContext.FeedbackReports
            .Include(candidate => candidate.Screenshot)
            .SingleOrDefaultAsync(candidate => candidate.Id == id, ct);

        if (report is null || report.Screenshot is null)
        {
            await SendNotFoundAsync(ct);
            return;
        }

        if (!FeedbackAccessRules.CanAccessScreenshot(report, userId, User.IsInRole(KnownRoles.Developer)))
        {
            await SendForbiddenAsync(ct);
            return;
        }

        MemoryStream stream;
        try
        {
            stream = await blobStorage.DownloadFileAsync(
                report.Screenshot.BlobContainerName,
                report.Screenshot.BlobName,
                ct);
        }
        catch (FileNotFoundException)
        {
            await SendNotFoundAsync(ct);
            return;
        }

        await SendStreamAsync(
            stream,
            fileName: report.Screenshot.FileName,
            fileLengthBytes: report.Screenshot.SizeBytes,
            contentType: report.Screenshot.ContentType,
            cancellation: ct);
    }
}