using System.Text.Json;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.ScanIdentifier;
using WiDAL.CustomCode.WiMaster;

namespace WiBLL.ScanTarget;

// Phase 1 resolver for the Scan-Identifier & Label Platform (GB5Shared/ScanIdentifier) — "MWI".
public class WiEntityResolver : IScanTargetResolver
{
    private readonly IWiMasterDAL _dal;

    public WiEntityResolver(IWiMasterDAL dal) => _dal = dal;

    public IEnumerable<string> SupportedEntityTypes => new[] { "MWI" };

    public async Task<bool> ExistsAsync(string entityId, LoginDTO login, CancellationToken ct)
        => int.TryParse(entityId, out var wiId) && await _dal.GetWiById(wiId, login, ct).ConfigureAwait(false) is not null;

    public async Task<ScanTargetDisplayDTO?> GetDisplayAsync(string entityId, LoginDTO login, CancellationToken ct)
    {
        if (!int.TryParse(entityId, out var wiId)) return null;
        var wi = await _dal.GetWiById(wiId, login, ct).ConfigureAwait(false);
        return wi is null ? null : new ScanTargetDisplayDTO { EntityId = entityId, Code = wi.WiCode, Name = wi.WiTitle };
    }

    // GetWiList has no text-search parameter — filters the full active-status list in memory.
    // Adequate for a picker; revisit with a real search query if WI counts grow large enough to matter.
    public async Task<IEnumerable<ScanTargetDisplayDTO>> SearchAsync(string? term, LoginDTO login, CancellationToken ct)
    {
        var json = await _dal.GetWiList(-1, 255, login, ct).ConfigureAwait(false);
        var rows = JsonSerializer.Deserialize<List<WiListRow>>(json, JsonOpts) ?? [];

        var filtered = string.IsNullOrWhiteSpace(term)
            ? rows
            : rows.Where(r => r.WiCode.Contains(term, StringComparison.OrdinalIgnoreCase)
                            || r.WiTitle.Contains(term, StringComparison.OrdinalIgnoreCase));

        return filtered.Take(20).Select(r => new ScanTargetDisplayDTO
        {
            EntityId = r.WiId.ToString(),
            Code = r.WiCode,
            Name = r.WiTitle
        });
    }

    private static readonly JsonSerializerOptions JsonOpts = new(JsonSerializerDefaults.Web);

    private sealed class WiListRow
    {
        public int WiId { get; set; }
        public string WiCode { get; set; } = string.Empty;
        public string WiTitle { get; set; } = string.Empty;
    }
}