/**
 * Validation rule for the assignment title.
 *
 * Ensures that the title is not empty.
 */
export const assignmentTitleRules = [
    (value: string) => {
        if (value?.length >= 1) return true;  // Title must not be empty
        return 'Title cannot be empty.';
    },
];

/**
 * Validation rule for the learning path selection.
 *
 * Ensures that a valid learning path is selected.
 */
export const learningPathRules = [
    (value: { hruid: string; title: string }) => {
        if (value && value.hruid) {
            return true;  // Valid if hruid is present
        }
        return 'You must select a learning path.';
    },
];

/**
 * Validation rule for the classes selection.
 *
 * Ensures that at least one class is selected.
 */
export const classRules = [
    (value: string) => {
        if (value) return true;
        return 'You must select at least one class.';
    },
];

/**
 * Validation rule for the deadline field.
 *
 * Ensures that a valid deadline is selected and is in the future.
 */
export const deadlineRules = [
    (value: string) => {
        if (!value) return "You must set a deadline.";

        const selectedDateTime = new Date(value);
        const now = new Date();

        if (isNaN(selectedDateTime.getTime())) return "Invalid date or time.";

        if (selectedDateTime <= now) return "The deadline must be in the future.";

        return true;
    },
];

export const descriptionRules = [
    (value: string) => {
        if (!value || value.trim() === "") return "Description cannot be empty.";
        return true;
    },
];