using PostFundManagement.Domain;
using PostFundManagement.Domain.Abstractions;
using PostFundManagement.Domain.Api;
using PostFundManagement.Domain.Extensions;
using PostFundManagement.Infrastructure.Database;

namespace PostFundManagement.Api.Endpoints.Evidence;

[ApiVersionTarget(1)]
public class UploadEvidenceFilesEndpoint : IEndpoint
{
    public void Map(IEndpointRouteBuilder builder)
    {
        builder.MapPost("api/evidence/files", async (HttpRequest request, ClaimsPrincipal principal, IDbContextFactory<ApplicationDbContext> contextFactory,
            [FromKeyedServices(Constants.EvidenceS3SettingsSection)] IS3Service s3Service, CancellationToken cancellationToken = default) =>
        {
            var sidClaim = principal.FindFirst("sid")?.Value ?? principal.FindFirst(ClaimTypes.Sid)?.Value;

            if (!Guid.TryParse(sidClaim, out var userId))
                return Results.BadRequest("Missing or invalid 'sid' claim.");

            if (!request.HasFormContentType)
                return Results.BadRequest("Request must be a multipart form.");

            var form = await request.ReadFormAsync(cancellationToken);
            var file = form.Files.GetFile("file");

            if (file == null || file.Length == 0)
                return Results.BadRequest("No file uploaded or file is empty.");

            _ = long.TryParse(form["projectId"], out var projectId);
            _ = long.TryParse(form["milestoneId"], out var milestoneId);
            _ = long.TryParse(form["indicatorId"], out var indicatorId);
            _ = long.TryParse(form["activityId"], out var activityId);
            _ = Enum.TryParse<EvidenceType>(form["type"], out var type);

            using var stream = file.OpenReadStream();

            var uploadResult = await s3Service.UploadFileAsync(file.FileName, stream, file.ContentType, cancellationToken);

            if (uploadResult.IsFailed)
                return Results.BadRequest(uploadResult.Errors.FirstOrDefault()?.Message ?? "File upload failed.");

            var documentUrl = uploadResult.Value;

            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var evidence = new Domain.Entities.Evidence
            {
                ProjectId = projectId,
                MilestoneId = milestoneId,
                IndicatorId = indicatorId,
                ActivityId = activityId,
                CreatedBy = userId,
                CreatedAt = DateTime.UtcNow,
                Version = 1,
                Type = type,
                DocumentUrl = documentUrl,
                Status = ApprovalStatus.Pending
            };

            context.Evidences.Add(evidence);

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Results.Created($"api/evidence/files/{evidence.Id}", evidence)
                : Results.BadRequest("Evidence upload failed");
        })
        .RequireAuthorization()
        .DisableAntiforgery()
        .WithDescription("Upload supporting evidence file to S3 and register metadata (M14)")
        .WithName(typeof(UploadEvidenceFilesEndpoint).ToEndpointName())
        .MapToApiVersion(new ApiVersion(1))
        .Produces<PostFundManagement.Domain.Entities.Evidence>(StatusCodes.Status201Created)
        .Produces(StatusCodes.Status400BadRequest)
        .Produces(StatusCodes.Status401Unauthorized)
        .WithTags(EndpointTags.Evidence);
    }
}