using FastEndpoints;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using QMSBLL.Matrix;
using static GB5Shared.GB5Constant.Constant;

namespace QMSSL.EndPoints.Matrix;

public class ExplodeBOM : BaseEndpoint<ExplodeBOM.Params, ResponseStandardDTO<object>>
{
    private readonly IMatrixBLL _bll;

    public ExplodeBOM(IMatrixBLL bll) => _bll = bll;

    public override void Configure()
    {
        Get("/Matrix/ExplodeBOM");
        AllowAnonymous();
        Description(x => x
            .WithTags("Matrix")
            .WithSummary("Explode BOM")
            .WithDescription("Explodes the Bill of Materials for the given production item and set range. Returns two arrays: Input (component/RM lines, BOMLEVEL != 0) with RequiredQty calculated as FINALQUANTITY × SetCount, and Output (FG production item line, BOMLEVEL = 0) with QuantityPer, RequiredQty, and SetNumber. Use these arrays to pre-populate the MatrixDTO before calling SaveMatrix. Optionally pass AllotedAllocationId to validate SetFrom/SetTo against the sets actually generated for that allocation (via GetGeneratedSets) — rejects with 400 if any set in the range wasn't generated."));
    }

    public record Params(
        [property: FromHeader] string Login,
        [property: QueryParam] int    ProductItemId,
        [property: QueryParam] int    SetFrom,
        [property: QueryParam] int    SetTo,
        [property: QueryParam] int?   AllotedAllocationId = null);

    protected override string? GetCacheKey(Params req, LoginDTO login) => null;

    protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
        Params req, LoginDTO login, CancellationToken ct)
    {
        try
        {
            if (req.ProductItemId == 0)
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(
                        new ArgumentException("ProductItemId is required."),
                        CacheKeyLevel.CLIENT_LEVEL, login,
                        "ProductItemId is required.", 400);

            if (req.SetFrom > req.SetTo)
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(
                        new ArgumentException("SetFrom cannot be greater than SetTo."),
                        CacheKeyLevel.CLIENT_LEVEL, login,
                        "SetFrom cannot be greater than SetTo.", 400);

            string result = await _bll.ExplodeBOMAsync(
                req.ProductItemId, req.SetFrom, req.SetTo, login, ct, req.AllotedAllocationId);

            return await GB5Shared.ResponseStandard.Response
                .CreateSuccessResponse(result, CacheKeyLevel.CLIENT_LEVEL, login);
        }
        catch (InvalidOperationException ex)
        {
            // SetFrom/SetTo-vs-generated-sets validation and "no BOM found" both
            // surface here as InvalidOperationException from the BLL — these are
            // caller input problems, not server faults, so 400 not 500.
            return await GB5Shared.ResponseStandard.Response
                .CreateExceptionError<string>(ex, CacheKeyLevel.CLIENT_LEVEL, login, ex.Message, 400);
        }
        catch (Exception ex)
        {
            return await GB5Shared.ResponseStandard.Response
                .CreateExceptionError<string>(ex, CacheKeyLevel.CLIENT_LEVEL, login, ex.Message, 500);
        }
    }
}