using GB5Shared.DTO.Framework.Login;
using GB5Shared.Telemetry;
using Microsoft.Extensions.Logging;
using OKRBLL.Interfaces;
using OKRDAL.Interfaces;
using System.Text.Json;

namespace OKRBLL.Implementations;

public class OKRTrendBLL : IOKRTrendBLL
{
    private readonly IGoalTrackDAL           _trackDal;
    private readonly IGoalDAL               _goalDal;
    private readonly ILogger<OKRTrendBLL>   _logger;

    public OKRTrendBLL(IGoalTrackDAL trackDal, IGoalDAL goalDal, ILogger<OKRTrendBLL> logger)
    {
        _trackDal = trackDal;
        _goalDal  = goalDal;
        _logger   = logger;
    }

    public async Task<string> GetGoalProgressTrendAsync(int goalId, LoginDTO login, CancellationToken ct)
    {
        try
        {
            GB5Trace.Step("get-goal-trend", new { goalId });
            var history = await _trackDal.GetTrackHistoryAsync(goalId, login, ct).ConfigureAwait(false);
            return JsonSerializer.Serialize(history);
        }
        catch (Exception ex)
        {
            GB5Trace.MarkFailed("get-goal-trend-failed", ex);
            _logger.LogError(ex, "GetGoalProgressTrend failed for GoalId {GoalId}", goalId);
            throw;
        }
    }

    public async Task<string> GetOKRCycleTrendAsync(int employeeId, int okrCycleId, LoginDTO login, CancellationToken ct)
    {
        try
        {
            GB5Trace.Step("get-okrcycle-trend", new { employeeId, okrCycleId });

            // Load all goals for this employee in the cycle, then fetch track history for each
            var goals = await _goalDal.GetGoalListAsync(okrCycleId, 0, employeeId, -1, 1, 500, login, ct).ConfigureAwait(false);

            var result = new List<object>();
            foreach (var goal in goals)
            {
                var history = await _trackDal.GetTrackHistoryAsync(goal.GoalId, login, ct).ConfigureAwait(false);
                result.Add(new { goal.GoalId, goal.Name, History = history });
            }

            return JsonSerializer.Serialize(result);
        }
        catch (Exception ex)
        {
            GB5Trace.MarkFailed("get-okrcycle-trend-failed", ex);
            _logger.LogError(ex, "GetOKRCycleTrend failed for EmployeeId {EmployeeId} OKRCycleId {OKRCycleId}", employeeId, okrCycleId);
            throw;
        }
    }
}