using GB5Shared.DTO.Framework.Login;
using IceImportDAL.CustomCode.GcmCodeLookup;

namespace IceImportBLL.LookupProvider;

// The one concrete ILookupProvider implementation for Phase 1, wrapping IGcmCodeLookupDAL.
//
// Design note: GCM-scoped lookups are disambiguated by GcmTypeId (IceMapDetailsDTO.GcmTypeId,
// set per row by the IceMap admin config), not by a single fixed MENTITY EntityId — there is no
// schema mapping tying one EntityId to exactly one GcmTypeId. EntityId=-1 is a sentinel meaning
// "never matched by EntityLookupService's ordinary EntityId-keyed ILookupProvider scan"; instead
// EntityLookupService detects GcmTypeId > 0 directly on the IceMapDetails row and calls
// ResolveByGcmTypeAsync (below) explicitly, grouped by GcmTypeId. This class still fully
// implements ILookupProvider so it participates in the DI-scanned plugin pattern and remains
// independently unit-testable/injectable like any other provider.
public class GcmCodeLookupProvider : ILookupProvider
{
    public int EntityId => -1;

    private readonly IGcmCodeLookupDAL _dal;

    public GcmCodeLookupProvider(IGcmCodeLookupDAL dal) => _dal = dal;

    public Task<Dictionary<string, int>> ResolveCodesToIdsAsync(
        IEnumerable<string> codes, LoginDTO login, CancellationToken ct)
        => throw new NotSupportedException(
            "GcmCodeLookupProvider requires a GcmTypeId — call ResolveByGcmTypeAsync directly " +
            "instead of the generic EntityId-keyed ILookupProvider dispatch.");

    public Task<Dictionary<string, int>> ResolveNamesToIdsAsync(
        IEnumerable<string> names, LoginDTO login, CancellationToken ct)
        => throw new NotSupportedException(
            "GcmCodeLookupProvider requires a GcmTypeId — call ResolveByGcmTypeAsync directly " +
            "instead of the generic EntityId-keyed ILookupProvider dispatch.");

    public Task<Dictionary<string, int>> ResolveByGcmTypeAsync(
        int gcmTypeId, IEnumerable<string> values, bool byName, LoginDTO login, CancellationToken ct)
        => byName
            ? _dal.ResolveNamesToIdsAsync(gcmTypeId, values, login, ct)
            : _dal.ResolveCodesToIdsAsync(gcmTypeId, values, login, ct);
}