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 CreateContractEndpoint : IEndpoint
{
    public record CreateContractRequest(long AwardId, decimal TotalValue, DateTime EffectiveAt, DateTime ExpiresAt);
    public record ExecuteContractRequest(string ExternalSignatureId, string SignedDocumentUrl);

    public void Map(IEndpointRouteBuilder builder)
    {
        builder.MapPost("api/grants/contracts", async (CreateContractRequest 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.");

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

            var award = await context.Awards.FirstOrDefaultAsync(a => a.Id == request.AwardId, cancellationToken);

            if (award == null)
                return Results.BadRequest($"Award with ID {request.AwardId} does not exist.");

            var contract = new Domain.Entities.Contract
            {
                AwardId = request.AwardId,
                TotalValue = request.TotalValue,
                EffectiveAt = request.EffectiveAt,
                ExpiresAt = request.ExpiresAt,
                Status = ContractStatus.Draft,
                CreatedBy = userId,
                CreatedAt = DateTime.UtcNow
            };

            context.Contracts.Add(contract);

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Results.Created($"api/grants/contracts/{contract.Id}", contract)
                : Results.BadRequest("Failed to create the contract");
        })
        .RequireAuthorization()
        .WithDescription("Create a contract record from an approved award (M02)")
        .WithName(typeof(CreateContractEndpoint).ToEndpointName())
        .MapToApiVersion(new ApiVersion(1))
        .Produces<Domain.Entities.Contract>(StatusCodes.Status201Created)
        .Produces(StatusCodes.Status400BadRequest)
        .Produces(StatusCodes.Status401Unauthorized)
        .WithTags(EndpointTags.Grants);
    }
}