/**
 * @module
 * Définit le modèle de données utilisé par l’application.
 */

import PropTypes from 'prop-types';

/**
 * Types de termes existants.
 */
export const termTypes = {
    disease: 'Maladie',
    symptom: 'Symptôme',
    sign: 'Signe',
};

/**
 * Type de terme.
 */
export const TermType = PropTypes.oneOf(Object.values(termTypes));

/**
 * Terme.
 *
 * Peut être une maladie, un symptôme ou un signe.
 */
export const Term = PropTypes.exact({
    id: PropTypes.string.isRequired,
    name: PropTypes.string.isRequired,
    alias: PropTypes.arrayOf(PropTypes.string).isRequired,
    types: PropTypes.arrayOf(TermType).isRequired,
    weight: PropTypes.number.isRequired,
});

/**
 * Relation entre deux termes.
 */
export const Relation = (props, propName, componentName) =>
{
    if (!(propName in props))
    {
        return new Error(
            `Missing ${propName} in props supplied to ${componentName}.`
        );
    }

    const value = props[propName];

    if (!Array.isArray(value))
    {
        return new Error(
            `Relation ${propName} must be an array.`
        );
    }

    if (value.length !== 2)
    {
        return new Error(
            `Relation ${propName} must contain exactly two entries.`
        );
    }

    if (
        typeof value[0] !== 'string'
        || typeof value[1] !== 'string'
    )
    {
        return new Error(
            `Entries of relation ${propName} must be string IDs.`
        );
    }
};