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

namespace PostFundManagement.Api.Endpoints.Grants;

[ApiVersionTarget(1)]
public class CreateAwardEndpoint : IEndpoint
{
    public record CreateAwardRequest(long OrganisationId, long ProgrammeId, decimal Amount);

    public void Map(IEndpointRouteBuilder builder)
    {
        builder.MapPost("api/grants/awards", async (CreateAwardRequest request, ClaimsPrincipal principal, 
            IDbContextFactory<ApplicationDbContext> contextFactory, 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.Amount <= 0)
                return Results.BadRequest("Approved amount must be greater than zero.");

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

            if (!await context.Organisations.AnyAsync(o => o.Id == request.OrganisationId, cancellationToken))
                return Results.BadRequest($"Organisation with ID {request.OrganisationId} does not exist.");

            if (!await context.Programmes.AnyAsync(p => p.Id == request.ProgrammeId, cancellationToken))
                return Results.BadRequest($"Programme with ID {request.ProgrammeId} does not exist.");

            var award = new Domain.Entities.Award
            {
                OrganisationId = request.OrganisationId,
                ProgrammeId = request.ProgrammeId,
                Amount = request.Amount,
                Status = ApprovalStatus.Pending,
                CreatedBy = userId,
                CreatedAt = DateTime.UtcNow
            };

            context.Awards.Add(award);

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Results.Created($"api/grants/awards/{award.Id}", award)
                : Results.BadRequest("Failred to create award");
        })
        .RequireAuthorization()
        .WithDescription("Register an approved funding award (M01)")
        .WithName(typeof(CreateAwardEndpoint).ToEndpointName())
        .MapToApiVersion(new ApiVersion(1))
        .Produces<Domain.Entities.Award>(StatusCodes.Status201Created)
        .Produces(StatusCodes.Status400BadRequest)
        .Produces(StatusCodes.Status401Unauthorized)
        .WithTags(EndpointTags.Grants);
    }
}