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

namespace WiBLL.ScanTarget;

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

    public WorkstationResolver(IWorkstationDAL dal) => _dal = dal;

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

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

    public async Task<ScanTargetDisplayDTO?> GetDisplayAsync(string entityId, LoginDTO login, CancellationToken ct)
    {
        if (!int.TryParse(entityId, out var workstationId)) return null;
        var ws = await _dal.GetByIdAsync(workstationId, login, ct).ConfigureAwait(false);
        return ws is null ? null : new ScanTargetDisplayDTO
        {
            EntityId = entityId,
            Code = ws.WorkstationCode,
            Name = ws.WorkstationName,
            ExtraFields = new Dictionary<string, string> { ["WorkCenterName"] = ws.WorkCenterName ?? string.Empty }
        };
    }

    // GetListAsync(workCenterId=-1, activeOnly=true) has no text-search parameter — filters in
    // memory, same MVP shortcut as WiEntityResolver.SearchAsync.
    public async Task<IEnumerable<ScanTargetDisplayDTO>> SearchAsync(string? term, LoginDTO login, CancellationToken ct)
    {
        var json = await _dal.GetListAsync(-1, true, login, ct).ConfigureAwait(false);
        var rows = JsonSerializer.Deserialize<List<WorkstationListRow>>(json, JsonOpts) ?? [];

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

        return filtered.Take(20).Select(r => new ScanTargetDisplayDTO
        {
            EntityId = r.WorkstationId.ToString(),
            Code = r.WorkstationCode,
            Name = r.WorkstationName
        });
    }

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

    private sealed class WorkstationListRow
    {
        public int WorkstationId { get; set; }
        public string WorkstationCode { get; set; } = string.Empty;
        public string WorkstationName { get; set; } = string.Empty;
    }
}