using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace CredentialManager.Models;

/// <summary>
/// Modello per la schedulazione dei profili Data Coupler
/// </summary>
public class ProfileSchedule
{
    [Key]
    public int Id { get; set; }

    [Required]
    [MaxLength(100)]
    public string Name { get; set; } = string.Empty;

    [MaxLength(500)]
    public string? Description { get; set; }

    // Relazione con il profilo
    [Required]
    public int ProfileId { get; set; }

    [ForeignKey(nameof(ProfileId))]
    public virtual DataCouplerProfile Profile { get; set; } = null!;

    // Configurazione scheduling
    [Required]
    public bool IsEnabled { get; set; } = true;

    [Required]
    [MaxLength(20)]
    public string ScheduleType { get; set; } = string.Empty; // "once", "daily", "weekly", "monthly", "interval"

    public DateTime? ScheduledDateTime { get; set; } // Per schedulazioni "once"

    [MaxLength(10)]
    public string? DailyTime { get; set; } // Format "HH:mm" per schedulazioni ricorrenti

    public int? DayOfWeek { get; set; } // 0-6 per schedulazioni settimanali (0=Domenica)

    public int? DayOfMonth { get; set; } // 1-31 per schedulazioni mensili

    // Configurazione per schedulazioni a intervalli
    public int? IntervalValue { get; set; } // Valore dell'intervallo (es. 5, 10, 30)

    [MaxLength(20)]
    public string? IntervalUnit { get; set; } // "seconds", "minutes", "hours", "days", "weeks", "months"

    // Tracking delle esecuzioni
    public DateTime? LastExecutionTime { get; set; }

    public DateTime? NextExecutionTime { get; set; }

    public int ExecutionCount { get; set; } = 0;

    [MaxLength(20)]
    public string LastExecutionStatus { get; set; } = string.Empty; // "success", "failed", "running"

    [MaxLength(1000)]
    public string? LastExecutionMessage { get; set; }

    public int? LastExecutionRecordCount { get; set; }

    // Configurazione override per database sources
    [MaxLength(100)]
    public string? SourceDatabaseOverride { get; set; }

    [MaxLength(100)]
    public string? DestinationDatabaseOverride { get; set; }

    // Metadati
    [MaxLength(100)]
    public string? CreatedBy { get; set; }

    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;

    public DateTime? UpdatedAt { get; set; }

    public bool IsActive { get; set; } = true;

    // Metodi helper per calcolare la prossima esecuzione
    public DateTime? CalculateNextExecution()
    {
        if (!IsEnabled || !IsActive)
            return null;

        var now = DateTime.Now;

        return ScheduleType switch
        {
            "once" => ScheduledDateTime > now ? ScheduledDateTime : null,
            "daily" when !string.IsNullOrEmpty(DailyTime) => CalculateNextDaily(now),
            "weekly" when DayOfWeek.HasValue && !string.IsNullOrEmpty(DailyTime) => CalculateNextWeekly(now),
            "monthly" when DayOfMonth.HasValue && !string.IsNullOrEmpty(DailyTime) => CalculateNextMonthly(now),
            "interval" when IntervalValue.HasValue && !string.IsNullOrEmpty(IntervalUnit) => CalculateNextInterval(now),
            _ => null
        };
    }

    public DateTime? CalculateNextExecutionFromLast()
    {
        if (!IsEnabled || !IsActive)
            return null;

        // Per intervalli, calcola dalla ultima esecuzione (o da ora se mai eseguito)
        if (ScheduleType == "interval" && IntervalValue.HasValue && !string.IsNullOrEmpty(IntervalUnit))
        {
            var baseTime = LastExecutionTime ?? DateTime.Now;
            return CalculateNextInterval(baseTime);
        }

        // Per altri tipi, usa CalculateNextExecution normale
        return CalculateNextExecution();
    }

    private DateTime CalculateNextDaily(DateTime now)
    {
        var time = TimeSpan.Parse(DailyTime!);
        var today = now.Date.Add(time);
        return today > now ? today : today.AddDays(1);
    }

    private DateTime CalculateNextWeekly(DateTime now)
    {
        var time = TimeSpan.Parse(DailyTime!);
        var targetDayOfWeek = (DayOfWeek)DayOfWeek!;
        
        var daysUntilTarget = ((int)targetDayOfWeek - (int)now.DayOfWeek + 7) % 7;
        if (daysUntilTarget == 0)
        {
            // È oggi, controlla se l'orario è già passato
            var todayAtTime = now.Date.Add(time);
            if (todayAtTime > now)
                return todayAtTime;
            else
                daysUntilTarget = 7; // Prossima settimana
        }

        return now.Date.AddDays(daysUntilTarget).Add(time);
    }

    private DateTime CalculateNextMonthly(DateTime now)
    {
        var time = TimeSpan.Parse(DailyTime!);
        var targetDay = DayOfMonth!.Value;
        
        var thisMonth = new DateTime(now.Year, now.Month, Math.Min(targetDay, DateTime.DaysInMonth(now.Year, now.Month))).Add(time);
        if (thisMonth > now)
            return thisMonth;

        // Prossimo mese
        var nextMonth = now.AddMonths(1);
        return new DateTime(nextMonth.Year, nextMonth.Month, Math.Min(targetDay, DateTime.DaysInMonth(nextMonth.Year, nextMonth.Month))).Add(time);
    }

    private DateTime CalculateNextInterval(DateTime baseTime)
    {
        if (!IntervalValue.HasValue || string.IsNullOrEmpty(IntervalUnit))
            return baseTime;

        return IntervalUnit.ToLower() switch
        {
            "seconds" => baseTime.AddSeconds(IntervalValue.Value),
            "minutes" => baseTime.AddMinutes(IntervalValue.Value),
            "hours" => baseTime.AddHours(IntervalValue.Value),
            "days" => baseTime.AddDays(IntervalValue.Value),
            "weeks" => baseTime.AddDays(IntervalValue.Value * 7),
            "months" => baseTime.AddMonths(IntervalValue.Value),
            _ => baseTime
        };
    }

    /// <summary>
    /// Ottiene una descrizione leggibile della schedulazione
    /// </summary>
    public string GetScheduleDescription()
    {
        return ScheduleType switch
        {
            "once" => $"Una volta il {ScheduledDateTime:dd/MM/yyyy HH:mm}",
            "daily" => $"Ogni giorno alle {DailyTime}",
            "weekly" => $"Ogni {GetDayOfWeekName(DayOfWeek)} alle {DailyTime}",
            "monthly" => $"Il giorno {DayOfMonth} di ogni mese alle {DailyTime}",
            "interval" => GetIntervalDescription(),
            _ => "Non configurato"
        };
    }

    private string GetIntervalDescription()
    {
        if (!IntervalValue.HasValue || string.IsNullOrEmpty(IntervalUnit))
            return "Intervallo non configurato";

        var unit = IntervalUnit.ToLower() switch
        {
            "seconds" => IntervalValue.Value == 1 ? "secondo" : "secondi",
            "minutes" => IntervalValue.Value == 1 ? "minuto" : "minuti",
            "hours" => IntervalValue.Value == 1 ? "ora" : "ore",
            "days" => IntervalValue.Value == 1 ? "giorno" : "giorni",
            "weeks" => IntervalValue.Value == 1 ? "settimana" : "settimane",
            "months" => IntervalValue.Value == 1 ? "mese" : "mesi",
            _ => IntervalUnit
        };

        return $"Ogni {IntervalValue} {unit}";
    }

    private string GetDayOfWeekName(int? dayOfWeek)
    {
        if (!dayOfWeek.HasValue)
            return "sconosciuto";

        return ((DayOfWeek)dayOfWeek.Value).ToString() switch
        {
            "Monday" => "Lunedì",
            "Tuesday" => "Martedì",
            "Wednesday" => "Mercoledì",
            "Thursday" => "Giovedì",
            "Friday" => "Venerdì",
            "Saturday" => "Sabato",
            "Sunday" => "Domenica",
            _ => dayOfWeek.Value.ToString()
        };
    }
}