using System.ComponentModel.DataAnnotations;
using DramaLing.Api.Utils;

namespace DramaLing.Api.Models.Entities;

/// <summary>
/// 簡化的詞卡實體 - 使用數字難度等級
/// </summary>
public class Flashcard
{
    private int? _difficultyLevelNumeric;

    public Guid Id { get; set; }

    public Guid UserId { get; set; }

    // 詞卡內容
    [Required]
    [MaxLength(255)]
    public string Word { get; set; } = string.Empty;

    [Required]
    public string Translation { get; set; } = string.Empty;

    public string? Definition { get; set; }

    [MaxLength(50)]
    public string? PartOfSpeech { get; set; }

    [MaxLength(255)]
    public string? Pronunciation { get; set; }

    public string? Example { get; set; }

    public string? ExampleTranslation { get; set; }

    [MaxLength(2000)]
    public string? Synonyms { get; set; }

    // 基本狀態
    public bool IsFavorite { get; set; } = false;

    public bool IsArchived { get; set; } = false;

    /// <summary>
    /// CEFR 難度等級 (數字格式: 0=未知, 1=A1, 2=A2, 3=B1, 4=B2, 5=C1, 6=C2)
    /// </summary>
    public int DifficultyLevelNumeric
    {
        get => _difficultyLevelNumeric ?? 0;
        set => _difficultyLevelNumeric = value;
    }

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

    // Navigation Properties
    public virtual User User { get; set; } = null!;
    public virtual ICollection<FlashcardTag> FlashcardTags { get; set; } = new List<FlashcardTag>();
    public virtual ICollection<ErrorReport> ErrorReports { get; set; } = new List<ErrorReport>();
    public virtual ICollection<FlashcardExampleImage> FlashcardExampleImages { get; set; } = new List<FlashcardExampleImage>();
}