using GB5Shared.DTO.Framework.Login;
using GB5Shared.Telemetry;
using Microsoft.Extensions.Logging;
using PERMBLL.Interfaces;
using PERMDAL.DTOs;
using PERMDAL.Interfaces;
using System.Text.Json;

namespace PERMBLL.Implementations;

public class TrendBLL : ITrendBLL
{
    private readonly ITrendDAL          _dal;
    private readonly ILogger<TrendBLL>  _logger;

    public TrendBLL(ITrendDAL dal, ILogger<TrendBLL> logger)
    {
        _dal    = dal;
        _logger = logger;
    }

    public async Task<string> GetPerformanceTrendAsync(
        int employeeId, int lastNCycles, LoginDTO login, CancellationToken ct)
    {
        try
        {
            GB5Trace.Step("get-performance-trend", new { employeeId, lastNCycles });
            var cycles = lastNCycles > 0 ? lastNCycles : 5;
            var points = await _dal.GetTrendPointsAsync(employeeId, cycles, login, ct).ConfigureAwait(false);
            var result = new PerformanceTrendDTO
            {
                EmployeeId = employeeId,
                Points     = points.ToList()
            };
            return JsonSerializer.Serialize(result);
        }
        catch (Exception ex)
        {
            GB5Trace.MarkFailed("get-performance-trend-failed", ex);
            _logger.LogError(ex, "GetPerformanceTrend failed for EmployeeId {EmployeeId}", employeeId);
            throw;
        }
    }
}