using CredentialManager.Data;
using CredentialManager.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

namespace CredentialManager.Services;

public class ProfileScheduleService : IProfileScheduleService
{
    private readonly CredentialDbContext _context;
    private readonly ILogger<ProfileScheduleService> _logger;

    public ProfileScheduleService(CredentialDbContext context, ILogger<ProfileScheduleService> logger)
    {
        _context = context ?? throw new ArgumentNullException(nameof(context));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public async Task<List<ProfileSchedule>> GetAllSchedulesAsync()
    {
        try
        {
            return await _context.ProfileSchedules
                .Include(s => s.Profile)
                .OrderBy(s => s.Name)
                .ToListAsync();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero di tutte le schedulazioni");
            throw;
        }
    }

    public async Task<ProfileSchedule?> GetScheduleByIdAsync(int id)
    {
        try
        {
            return await _context.ProfileSchedules
                .Include(s => s.Profile)
                .FirstOrDefaultAsync(s => s.Id == id);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero della schedulazione con ID {Id}", id);
            throw;
        }
    }

    public async Task<ProfileSchedule> CreateScheduleAsync(ProfileSchedule schedule)
    {
        try
        {
            schedule.CreatedAt = DateTime.UtcNow;
            schedule.UpdatedAt = DateTime.UtcNow;
            schedule.CreatedBy = Environment.UserName;
            
            // Calcola la prossima esecuzione
            schedule.NextExecutionTime = schedule.CalculateNextExecution();

            _context.ProfileSchedules.Add(schedule);
            await _context.SaveChangesAsync();

            _logger.LogInformation("Schedulazione creata: {Name} per il profilo {ProfileId}", schedule.Name, schedule.ProfileId);
            
            return schedule;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nella creazione della schedulazione {Name}", schedule.Name);
            throw;
        }
    }

    public async Task<ProfileSchedule> UpdateScheduleAsync(ProfileSchedule schedule)
    {
        try
        {
            var existingSchedule = await _context.ProfileSchedules.FindAsync(schedule.Id);
            if (existingSchedule == null)
                throw new InvalidOperationException($"Schedulazione con ID {schedule.Id} non trovata");

            // Aggiorna i campi
            existingSchedule.Name = schedule.Name;
            existingSchedule.Description = schedule.Description;
            existingSchedule.ProfileId = schedule.ProfileId;
            existingSchedule.IsEnabled = schedule.IsEnabled;
            existingSchedule.ScheduleType = schedule.ScheduleType;
            existingSchedule.ScheduledDateTime = schedule.ScheduledDateTime;
            existingSchedule.DailyTime = schedule.DailyTime;
            existingSchedule.DayOfWeek = schedule.DayOfWeek;
            existingSchedule.DayOfMonth = schedule.DayOfMonth;
            existingSchedule.IntervalValue = schedule.IntervalValue;
            existingSchedule.IntervalUnit = schedule.IntervalUnit;
            existingSchedule.IsActive = schedule.IsActive;
            existingSchedule.EnableDeletionSync = schedule.EnableDeletionSync;
            existingSchedule.SourceDatabaseOverride = schedule.SourceDatabaseOverride;
            existingSchedule.DestinationDatabaseOverride = schedule.DestinationDatabaseOverride;
            existingSchedule.UpdatedAt = DateTime.UtcNow;

            // Ricalcola la prossima esecuzione
            existingSchedule.NextExecutionTime = existingSchedule.CalculateNextExecution();

            await _context.SaveChangesAsync();

            _logger.LogInformation("Schedulazione aggiornata: {Name}", existingSchedule.Name);
            
            return existingSchedule;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nell'aggiornamento della schedulazione con ID {Id}", schedule.Id);
            throw;
        }
    }

    public async Task<bool> DeleteScheduleAsync(int id)
    {
        try
        {
            var schedule = await _context.ProfileSchedules.FindAsync(id);
            if (schedule == null)
                return false;

            _context.ProfileSchedules.Remove(schedule);
            await _context.SaveChangesAsync();

            _logger.LogInformation("Schedulazione eliminata: {Name} (ID: {Id})", schedule.Name, id);
            
            return true;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nell'eliminazione della schedulazione con ID {Id}", id);
            throw;
        }
    }

    public async Task<List<ProfileSchedule>> GetActiveSchedulesAsync()
    {
        try
        {
            return await _context.ProfileSchedules
                .Include(s => s.Profile)
                .Where(s => s.IsActive && s.IsEnabled)
                .OrderBy(s => s.NextExecutionTime)
                .ToListAsync();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero delle schedulazioni attive");
            throw;
        }
    }

    public async Task<List<ProfileSchedule>> GetPendingExecutionsAsync()
    {
        try
        {
            var now = DateTime.Now;
            
            return await _context.ProfileSchedules
                .Include(s => s.Profile)
                .Where(s => s.IsActive && 
                           s.IsEnabled && 
                           s.NextExecutionTime.HasValue && 
                           s.NextExecutionTime <= now &&
                           s.LastExecutionStatus != "running")
                .OrderBy(s => s.NextExecutionTime)
                .ToListAsync();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero delle schedulazioni in attesa di esecuzione");
            throw;
        }
    }

    public async Task<bool> UpdateExecutionStatusAsync(int scheduleId, string status, string? message = null, int? recordCount = null)
    {
        try
        {
            var schedule = await _context.ProfileSchedules.FindAsync(scheduleId);
            if (schedule == null)
                return false;

            schedule.LastExecutionStatus = status;
            schedule.LastExecutionMessage = message;
            schedule.LastExecutionTime = DateTime.Now;
            
            if (recordCount.HasValue)
                schedule.LastExecutionRecordCount = recordCount;

            if (status == "success" || status == "failed")
            {
                schedule.ExecutionCount++;
                // Calcola la prossima esecuzione solo se completata (successo o errore)
                schedule.NextExecutionTime = schedule.CalculateNextExecution();
            }

            await _context.SaveChangesAsync();

            _logger.LogInformation("Status esecuzione aggiornato per schedulazione {ScheduleId}: {Status}", scheduleId, status);
            
            return true;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nell'aggiornamento dello status per schedulazione {ScheduleId}", scheduleId);
            throw;
        }
    }

    public async Task UpdateNextExecutionTimeAsync(int scheduleId)
    {
        try
        {
            var schedule = await _context.ProfileSchedules.FindAsync(scheduleId);
            if (schedule == null)
                return;

            // Per schedulazioni a intervallo, calcola dalla ultima esecuzione
            if (schedule.ScheduleType == "interval")
            {
                schedule.NextExecutionTime = schedule.CalculateNextExecutionFromLast();
            }
            else
            {
                schedule.NextExecutionTime = schedule.CalculateNextExecution();
            }

            await _context.SaveChangesAsync();

            _logger.LogDebug("Prossima esecuzione aggiornata per schedulazione {ScheduleId}: {NextExecution} (tipo: {Type})", 
                scheduleId, schedule.NextExecutionTime, schedule.ScheduleType);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nell'aggiornamento della prossima esecuzione per schedulazione {ScheduleId}", scheduleId);
            throw;
        }
    }

    public async Task<List<DataCouplerProfile>> GetAvailableProfilesAsync()
    {
        try
        {
            return await _context.DataCouplerProfiles
                .Where(p => p.IsActive)
                .OrderBy(p => p.Name)
                .ToListAsync();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero dei profili disponibili");
            throw;
        }
    }

    // Implementazione metodi per lo storico delle esecuzioni
    public async Task<ScheduleExecutionHistory> CreateExecutionHistoryAsync(ScheduleExecutionHistory history)
    {
        try
        {
            history.CreatedAt = DateTime.UtcNow;
            
            _context.ScheduleExecutionHistories.Add(history);
            await _context.SaveChangesAsync();

            _logger.LogInformation("Storico esecuzione creato: ID {HistoryId} per schedulazione {ScheduleId}", 
                history.Id, history.ScheduleId);
            
            return history;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nella creazione dello storico esecuzione per schedulazione {ScheduleId}", 
                history.ScheduleId);
            throw;
        }
    }

    public async Task<ScheduleExecutionHistory> UpdateExecutionHistoryAsync(ScheduleExecutionHistory history)
    {
        try
        {
            _context.ScheduleExecutionHistories.Update(history);
            await _context.SaveChangesAsync();

            _logger.LogDebug("Storico esecuzione aggiornato: ID {HistoryId}", history.Id);
            
            return history;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nell'aggiornamento dello storico esecuzione ID {HistoryId}", history.Id);
            throw;
        }
    }

    public async Task<List<ScheduleExecutionHistory>> GetExecutionHistoryAsync(int scheduleId, int? limit = null)
    {
        try
        {
            var query = _context.ScheduleExecutionHistories
                .Where(h => h.ScheduleId == scheduleId)
                .OrderByDescending(h => h.StartTime);

            if (limit.HasValue)
            {
                query = (IOrderedQueryable<ScheduleExecutionHistory>)query.Take(limit.Value);
            }

            return await query.ToListAsync();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero dello storico per schedulazione {ScheduleId}", scheduleId);
            throw;
        }
    }

    public async Task<List<ScheduleExecutionHistory>> GetRecentExecutionsAsync(int limit = 50)
    {
        try
        {
            return await _context.ScheduleExecutionHistories
                .Include(h => h.Schedule)
                .OrderByDescending(h => h.StartTime)
                .Take(limit)
                .ToListAsync();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero delle esecuzioni recenti");
            throw;
        }
    }

    public async Task<ScheduleExecutionHistory?> GetExecutionByIdAsync(int executionId)
    {
        try
        {
            return await _context.ScheduleExecutionHistories
                .Include(h => h.Schedule)
                .FirstOrDefaultAsync(h => h.Id == executionId);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Errore nel recupero dell'esecuzione ID {ExecutionId}", executionId);
            throw;
        }
    }
}