using Microsoft.AspNetCore.Identity;
using System.ComponentModel.DataAnnotations;

namespace NexusReader.Domain.Entities;

/// <summary>
/// Extended Identity user for the Nexus AI E-Reader SaaS platform.
/// </summary>
public class NexusUser : IdentityUser
{
    /// <summary>
    /// Total number of AI tokens allowed for the current billing period.
    /// </summary>
    public int AITokenLimit { get; set; }

    /// <summary>
    /// Number of AI tokens consumed in the current billing period.
    /// </summary>
    public int AITokensUsed { get; set; }

    /// <summary>
    /// Unique identifier for the tenant (SaaS multi-tenancy support).
    /// </summary>
    [Required]
    [MaxLength(128)]
    public string TenantId { get; set; } = "global";

    /// <summary>
    /// Current subscription plan (e.g., "Free", "Pro", "Enterprise").
    /// </summary>
    public string CurrentPlan { get; set; } = "Free";

    /// <summary>
    /// Collection of e-books owned by the user.
    /// </summary>
    public ICollection<Ebook> Ebooks { get; set; } = new List<Ebook>();

    /// <summary>
    /// Collection of quiz results completed by the user.
    /// </summary>
    public ICollection<QuizResult> QuizResults { get; set; } = new List<QuizResult>();

    /// <summary>
    /// ID of the last page read by the user.
    /// </summary>
    public string? LastReadPageId { get; set; }

    /// <summary>
    /// Timestamp of the last reading progress update.
    /// </summary>
    public DateTime? LastReadAt { get; set; }
}