# frozen_string_literal: true

require "test_helper"

class GradeTest < ActiveSupport::TestCase
  test "factory" do
    assert build(:grade).validate!
  end

  test "has many classroom_grades" do
    grade = create(:grade)
    cg1 = create(:classroom_grade, grade: grade)
    cg2 = create(:classroom_grade, grade: grade)

    assert_equal 2, grade.classroom_grades.count
    assert_includes grade.classroom_grades, cg1
    assert_includes grade.classroom_grades, cg2
  end

  test "has many classrooms through classroom_grades" do
    grade = create(:grade)
    classroom1 = create(:classroom)
    classroom2 = create(:classroom)
    create(:classroom_grade, grade: grade, classroom: classroom1)
    create(:classroom_grade, grade: grade, classroom: classroom2)

    assert_equal 2, grade.classrooms.count
    assert_includes grade.classrooms, classroom1
    assert_includes grade.classrooms, classroom2
  end

  test "can destroy a grade with no classrooms" do
    grade = create(:grade)

    assert_difference "Grade.count", -1 do
      grade.destroy
    end
  end

  test "cannot destroy a grade that is used by classrooms" do
    grade = create(:grade)
    create(:classroom_grade, grade: grade)

    assert_not grade.destroy
    assert grade.errors.any?
    assert_includes grade.errors[:base], "Cannot delete record because dependent classroom grades exist"
  end

  test "name must be present" do
    grade = build(:grade, name: nil)
    assert_not grade.valid?
    assert_includes grade.errors[:name], "can't be blank"
  end

  test "level must be present" do
    grade = build(:grade, level: nil)
    assert_not grade.valid?
    assert_includes grade.errors[:level], "can't be blank"
  end

  test "name is unique and case-insensitively" do
    create(:grade, name: "5th Grade", level: 6)

    duplicate = build(:grade, name: "5TH grade", level: 6)
    assert_not duplicate.valid?
    assert_includes duplicate.errors[:name], "has already been taken"
  end

  test "level is unique" do
    create(:grade, name: "5th Grade", level: 6)

    duplicate = build(:grade, name: "5th Grade", level: 6)
    assert_not duplicate.valid?
    assert_includes duplicate.errors[:level], "has already been taken"
  end
end