using System.ComponentModel.DataAnnotations;

namespace DramaLing.Api.Models.Entities;

/// <summary>
/// 學習會話中的詞卡進度追蹤
/// </summary>
public class StudyCard
{
    public Guid Id { get; set; }

    public Guid StudySessionId { get; set; }

    public Guid FlashcardId { get; set; }

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

    /// <summary>
    /// 該詞卡預定的測驗類型列表 (JSON序列化)
    /// 例如: ["flip-memory", "vocab-choice", "sentence-fill"]
    /// </summary>
    [Required]
    public string PlannedTestsJson { get; set; } = string.Empty;

    /// <summary>
    /// 詞卡在會話中的順序
    /// </summary>
    public int Order { get; set; }

    /// <summary>
    /// 是否已完成所有測驗
    /// </summary>
    public bool IsCompleted { get; set; } = false;

    /// <summary>
    /// 詞卡學習開始時間
    /// </summary>
    public DateTime StartedAt { get; set; } = DateTime.UtcNow;

    /// <summary>
    /// 詞卡學習完成時間
    /// </summary>
    public DateTime? CompletedAt { get; set; }

    // Navigation Properties
    public virtual StudySession StudySession { get; set; } = null!;
    public virtual Flashcard Flashcard { get; set; } = null!;
    public virtual ICollection<TestResult> TestResults { get; set; } = new List<TestResult>();

    // Helper Properties (不映射到資料庫)
    public List<string> PlannedTests
    {
        get => string.IsNullOrEmpty(PlannedTestsJson)
            ? new List<string>()
            : System.Text.Json.JsonSerializer.Deserialize<List<string>>(PlannedTestsJson) ?? new List<string>();
        set => PlannedTestsJson = System.Text.Json.JsonSerializer.Serialize(value);
    }

    public int CompletedTestsCount => TestResults?.Count ?? 0;
    public int PlannedTestsCount => PlannedTests.Count;
    public bool AllTestsCompleted => CompletedTestsCount >= PlannedTestsCount;
}

/// <summary>
/// 詞卡內的測驗結果記錄
/// </summary>
public class TestResult
{
    public Guid Id { get; set; }

    public Guid StudyCardId { get; set; }

    [Required]
    [MaxLength(50)]
    public string TestType { get; set; } = string.Empty; // flip-memory, vocab-choice, etc.

    public bool IsCorrect { get; set; }

    public string? UserAnswer { get; set; }

    /// <summary>
    /// 信心等級 (1-5, 主要用於翻卡記憶測驗)
    /// </summary>
    [Range(1, 5)]
    public int? ConfidenceLevel { get; set; }

    public int ResponseTimeMs { get; set; }

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

    // Navigation Properties
    public virtual StudyCard StudyCard { get; set; } = null!;
}