import { asArray, asSingleValue } from './multiplicity-utils.js';
/**
 * Turn a partial annotation into a ‘well-formed’ WebAnnotation.
 *
 * It sets the following properties, if absent in the given stub:
 * - `@context` as required
 * - `type` as required, to `'Annotation'`
 * - `created` as recommended (to the current time)
 * - `target` to `'about:invalid'`
 *
 * @returns A shallow clone of the given annotation stub, with the missing
 * properties added.
 */
export function completeAnnotationStub(annotationStub) {
    const webAnnotation = Object.assign({ '@context': 'http://www.w3.org/ns/anno.jsonld', type: 'Annotation', created: new Date().toISOString(), id: '', target: 'about:invalid' }, annotationStub);
    return webAnnotation;
}
/**
 * Get the name of the creator. If there are multiple, returns the first.
 * Assumes the creator is a nested Agent object: if the creator a string
 * (presumably the URL of an Agent node), `undefined` is returned.
 */
export function getSingleCreatorName(annotationOrBody) {
    var _a;
    const creator = asSingleValue(annotationOrBody.creator);
    if (typeof creator === 'string')
        return undefined;
    return asSingleValue((_a = creator === null || creator === void 0 ? void 0 : creator.name) !== null && _a !== void 0 ? _a : creator === null || creator === void 0 ? void 0 : creator.nickname);
}
/**
 * Check whether the annotation likely targets the given URL.
 *
 * The word “likely” is used because, in its comparison, this ignores the URL
 * scheme, fragment and query parameters.
 *
 * Note that, strictly speaking, a URL should be treated as an opaque string.
 * In practice, it may however be useful to consider URLs as ‘likely equivalent’
 * in order to apply annotations targeting one URL to the document with the
 * very similar URL. Apply with caution: Especially a different query may,
 * depending on the website at hand, result in very different documents.
 */
export function targetsUrl(target, url) {
    return getTargetUrls(target).some((targetUrl) => sameishUrl(targetUrl, url));
}
// Compare URLs while ignoring the scheme, fragment identifier, query parameter and trailing slash.
function sameishUrl(url1, url2) {
    return normaliseUrl(url1) === normaliseUrl(url2);
}
function normaliseUrl(url) {
    url = url
        .split('#')[0]
        .split('?')[0]
        .replace(/^[a-zA-Z0-9.+-]+:\/\//, '');
    if (url.endsWith('/'))
        url = url.slice(0, -1);
    return url;
}
/**
 * Get the URLs of the resources that the annotation targets, for all its
 * targets.
 */
export function getTargetUrls(target) {
    return unique(asArray(target).map(getTargetUrl));
}
/**
 * Get the URL of the resource that the annotation targets, for a single
 * target.
 */
export function getTargetUrl(target) {
    if (typeof target === 'string') {
        // This string *could* be referring to a non-nested SpecificResource that
        // then contains the actual target URL. But we are not able to fetch that
        // now, and simply assume the string refers to the target document.
        return target;
    }
    // Specific Resource
    if ('source' in target)
        return target.source;
    // External Resource
    return target.id;
}
/**
 * Get the exact quotes that the annotation targets using a TextQuoteSelector,
 * if any.
 */
export function getTargetQuotes(target) {
    const quotes = unique(asArray(target).map(getTargetQuote)).filter((s) => s !== undefined);
    return quotes;
}
/**
 * Get the exact quote that a single target of an annotation targets using a
 * TextQuoteSelector, if any.
 */
export function getTargetQuote(target) {
    if (typeof target === 'string')
        return undefined;
    if ('selector' in target) {
        // Find if target.selector is/has a TextQuoteSelector.
        const selectors = asArray(target.selector);
        const textQuoteSelector = selectors.find(selector => {
            if (typeof selector === 'string') {
                // The selector is not nested in the annotation. But we are not able to
                // fetch it now, and will thus have to ignore this selector.
                return false;
            }
            return selector.type === 'TextQuoteSelector';
        });
        if (textQuoteSelector)
            return textQuoteSelector.exact;
    }
}
function unique(a) {
    return [...new Set(a)];
}