using FluentValidation;
using GermanApp.Application.DTOs;

namespace GermanApp.Presentation.Validators;

/// <summary>
/// Validator for CreateLessonDto.
/// Validates input when creating a new lesson.
/// </summary>
public class CreateLessonValidator : AbstractValidator<CreateLessonDto>
{
    public CreateLessonValidator()
    {
        RuleFor(x => x.Title)
            .NotEmpty().WithMessage("Lesson title is required.")
            .MinimumLength(3).WithMessage("Lesson title must be at least 3 characters long.")
            .MaximumLength(200).WithMessage("Lesson title must not exceed 200 characters.");

        RuleFor(x => x.Description)
            .MaximumLength(2000).WithMessage("Lesson description must not exceed 2000 characters.");

        RuleFor(x => x.LevelId)
            .GreaterThan(0).WithMessage("Level ID must be greater than 0.");

        RuleFor(x => x.Order)
            .GreaterThanOrEqualTo(0).WithMessage("Order must be at least 0.")
            .LessThanOrEqualTo(1000).WithMessage("Order must not exceed 1000.");

        RuleFor(x => x.Topic)
            .NotEmpty().WithMessage("Topic is required.")
            .MinimumLength(2).WithMessage("Topic must be at least 2 characters long.")
            .MaximumLength(100).WithMessage("Topic must not exceed 100 characters.");
    }
}

/// <summary>
/// Validator for UpdateLessonDto.
/// Validates input when updating an existing lesson.
/// </summary>
public class UpdateLessonValidator : AbstractValidator<UpdateLessonDto>
{
    public UpdateLessonValidator()
    {
        RuleFor(x => x.Title)
            .NotEmpty().WithMessage("Lesson title is required.")
            .MinimumLength(3).WithMessage("Lesson title must be at least 3 characters long.")
            .MaximumLength(200).WithMessage("Lesson title must not exceed 200 characters.");

        RuleFor(x => x.Description)
            .MaximumLength(2000).WithMessage("Lesson description must not exceed 2000 characters.");

        RuleFor(x => x.LevelId)
            .GreaterThan(0).WithMessage("Level ID must be greater than 0.");

        RuleFor(x => x.Order)
            .GreaterThanOrEqualTo(0).WithMessage("Order must be at least 0.")
            .LessThanOrEqualTo(1000).WithMessage("Order must not exceed 1000.");

        RuleFor(x => x.Topic)
            .NotEmpty().WithMessage("Topic is required.")
            .MinimumLength(2).WithMessage("Topic must be at least 2 characters long.")
            .MaximumLength(100).WithMessage("Topic must not exceed 100 characters.");
    }
}