import { sym } from 'rdflib';

/**

* Container-related class

*/

export function createContainerLogic(store) {

function getContainerElements(containerNode) {

return store

.statementsMatching(containerNode, sym('http://www.w3.org/ns/ldp#contains'), undefined)

.map((st) => st.object);

}

function isContainer(url) {

const nodeToString = url.value;

return nodeToString.charAt(nodeToString.length - 1) === '/';

}

async function createContainer(url) {

const stringToNode = sym(url);

if (!isContainer(stringToNode)) {

throw new Error(`Not a container URL ${url}`);

}

// Copied from https://github.com/solidos/solid-crud-tests/blob/v3.1.0/test/surface/create-container.test.ts#L56-L64

const result = await store.fetcher._fetch(url, {

method: 'PUT',

headers: {

'Content-Type': 'text/turtle',

'If-None-Match': '*',

Link: '<http://www.w3.org/ns/ldp#BasicContainer>; rel="type"', // See https://github.com/solidos/node-solid-server/issues/1465

},

body: ' ', // work around https://github.com/michielbdejong/community-server/issues/4#issuecomment-776222863

});

if (result.status.toString()[0] !== '2') {

throw new Error(`Not OK: got ${result.status} response while creating container at ${url}`);

}

}

async function getContainerMembers(containerUrl) {

await store.fetcher.load(containerUrl);

return getContainerElements(containerUrl);

}

return {

isContainer,

createContainer,

getContainerElements,

getContainerMembers

};

}

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