using GermanApp.Domain.Entities;

namespace GermanApp.Application.DTOs;

/// <summary>
/// Data Transfer Object for UserProgress - used for API responses.
/// This is a read-only representation of a UserProgress entity.
/// </summary>
public record UserProgressDto(
    int Id,
    int UserId,
    int LessonId,
    bool IsCompleted,
    int QuizScore,
    DateTime LastAttemptDate,
    string? LessonTitle = null,
    string? LevelName = null,
    string? LevelCode = null);

/// <summary>
/// Data Transfer Object for creating/updating user progress.
/// </summary>
public record UpdateUserProgressDto(
    int LessonId,
    bool IsCompleted,
    int QuizScore);

/// <summary>
/// Data Transfer Object for level completion summary.
/// </summary>
public record LevelCompletionDto(
    int LevelId,
    string LevelName,
    string LevelCode,
    int TotalLessons,
    int CompletedLessons,
    double CompletionPercentage);

/// <summary>
/// Extension methods for mapping between UserProgress entity and DTOs.
/// </summary>
public static class UserProgressDtoExtensions
{
    public static UserProgressDto ToDto(this UserProgress userProgress) => new(
        userProgress.Id,
        userProgress.UserId,
        userProgress.LessonId,
        userProgress.IsCompleted,
        userProgress.QuizScore,
        userProgress.LastAttemptDate,
        userProgress.Lesson?.Title,
        userProgress.Lesson?.Level?.Name,
        userProgress.Lesson?.Level?.Code);

    public static UserProgress ToEntity(this UpdateUserProgressDto dto, int userId)
    {
        var progress = UserProgress.Create(userId, dto.LessonId);
        if (dto.IsCompleted)
        {
            progress.MarkAsCompleted(dto.QuizScore);
        }
        else
        {
            progress.UpdateQuizScore(dto.QuizScore);
        }
        return progress;
    }

    public static void UpdateFromDto(this UserProgress userProgress, UpdateUserProgressDto dto)
    {
        if (dto.IsCompleted)
        {
            userProgress.MarkAsCompleted(dto.QuizScore);
        }
        else
        {
            userProgress.UpdateQuizScore(dto.QuizScore);
        }
    }
}