using System.ComponentModel.DataAnnotations;

namespace Lagerbestand.Models;

/// <summary>
/// Priority levels for Kanban tasks
/// </summary>
public enum KanbanTaskPriority
{
    Low = 0,
    Medium = 1,
    High = 2,
    Urgent = 3
}

/// <summary>
/// Represents a task/card in the Kanban board
/// </summary>
public class KanbanTask
{
    public Guid Id { get; set; } = Guid.NewGuid();

    [Required]
    [MaxLength(200)]
    public string Title { get; set; } = string.Empty;

    /// <summary>
    /// Rich text description of the task
    /// </summary>
    public string? Description { get; set; }

    /// <summary>
    /// The column this task belongs to
    /// </summary>
    public Guid ColumnId { get; set; }

    /// <summary>
    /// Sort order within the column
    /// </summary>
    public int SortOrder { get; set; }

    /// <summary>
    /// Due date for the task
    /// </summary>
    public DateTime? DueDate { get; set; }

    /// <summary>
    /// Priority level
    /// </summary>
    public KanbanTaskPriority Priority { get; set; } = KanbanTaskPriority.Medium;

    /// <summary>
    /// Estimated time in minutes
    /// </summary>
    public int? EstimatedMinutes { get; set; }

    /// <summary>
    /// User who created the task
    /// </summary>
    public Guid? CreatedByUserId { get; set; }

    /// <summary>
    /// Whether the task is archived
    /// </summary>
    public bool IsArchived { get; set; }

    /// <summary>
    /// When the task was moved to a completed column
    /// </summary>
    public DateTime? CompletedAt { get; set; }

    /// <summary>
    /// When the task was archived
    /// </summary>
    public DateTime? ArchivedAt { get; set; }

    /// <summary>
    /// Simple notes/memo field for the task
    /// </summary>
    public string? NotesText { get; set; }

    /// <summary>
    /// Free text field for tire size notes (Reifengröße)
    /// </summary>
    public string? TireSizeNote { get; set; }

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

    // Navigation properties
    public virtual KanbanColumn? Column { get; set; }
    public virtual AppUser? CreatedByUser { get; set; }

    public virtual ICollection<KanbanTaskTodo> Todos { get; set; } = new List<KanbanTaskTodo>();
    public virtual ICollection<KanbanTaskLabel> TaskLabels { get; set; } = new List<KanbanTaskLabel>();
    public virtual ICollection<KanbanTaskComment> Comments { get; set; } = new List<KanbanTaskComment>();
    public virtual ICollection<KanbanTaskNote> Notes { get; set; } = new List<KanbanTaskNote>();
    public virtual ICollection<KanbanTaskAttachment> Attachments { get; set; } = new List<KanbanTaskAttachment>();
    public virtual ICollection<KanbanTaskAssignee> Assignees { get; set; } = new List<KanbanTaskAssignee>();
    public virtual ICollection<KanbanTaskCustomer> TaskCustomers { get; set; } = new List<KanbanTaskCustomer>();
    public virtual ICollection<KanbanTaskTireStack> TaskTireStacks { get; set; } = new List<KanbanTaskTireStack>();

    // Computed properties
    public bool IsDueToday => DueDate.HasValue && DueDate.Value.Date == DateTime.UtcNow.Date && !CompletedAt.HasValue;
    public bool IsOverdue => DueDate.HasValue && DueDate.Value.Date < DateTime.UtcNow.Date && !IsArchived && !CompletedAt.HasValue;

    public int TodosCompleted => Todos.Count(t => t.IsCompleted);
    public int TodosTotal => Todos.Count;
    public string TodoProgress => TodosTotal > 0 ? $"{TodosCompleted}/{TodosTotal}" : "";

    public string PriorityText => Priority switch
    {
        KanbanTaskPriority.Low => "Niedrig",
        KanbanTaskPriority.Medium => "Mittel",
        KanbanTaskPriority.High => "Hoch",
        KanbanTaskPriority.Urgent => "Dringend",
        _ => "Mittel"
    };

    public string PriorityIcon => Priority switch
    {
        KanbanTaskPriority.Low => "⬇️",
        KanbanTaskPriority.Medium => "➡️",
        KanbanTaskPriority.High => "⬆️",
        KanbanTaskPriority.Urgent => "🔥",
        _ => "➡️"
    };

    public string EstimatedTimeDisplay
    {
        get
        {
            if (!EstimatedMinutes.HasValue) return "";
            var hours = EstimatedMinutes.Value / 60;
            var mins = EstimatedMinutes.Value % 60;
            if (hours > 0 && mins > 0) return $"{hours}h {mins}m";
            if (hours > 0) return $"{hours}h";
            return $"{mins}m";
        }
    }
}