/**
 * Javascript file which handle ChillCollectionType
 *
 * Two events are emitted by this module, both on window and on collection / ul.
 *
 * Collection (an UL element) and entry (a li element) are associated with those
 * events.
 *
 * ```
 * window.addEventListener('collection-add-entry', function(e) {
 *   console.log(e.detail.collection);
 *   console.log(e.detail.entry);
 * });
 *
 * window.addEventListener('collection-remove-entry', function(e) {
 *   console.log(e.detail.collection);
 *   console.log(e.detail.entry);
 * });
 *
 * collection.addEventListener('collection-add-entry', function(e) {
 *   console.log(e.detail.collection);
 *   console.log(e.detail.entry);
 * });
 *
 * collection.addEventListener('collection-remove-entry', function(e) {
 *   console.log(e.detail.collection);
 *   console.log(e.detail.entry);
 * });
 * ```
 */
import './collection.scss';

export class CollectionEventPayload {
    collection: HTMLUListElement;
    entry: HTMLLIElement;

    constructor(collection: HTMLUListElement, entry: HTMLLIElement) {
        this.collection = collection;
        this.entry = entry;
    }
}

export const handleAdd = (button: any): void => {
    let
        form_name = button.dataset.collectionAddTarget,
        prototype = button.dataset.formPrototype,
        collection: HTMLUListElement | null = document.querySelector('ul[data-collection-name="' + form_name + '"]');

    if (collection === null) {
        return;
    }

    let
        empty_explain: HTMLLIElement | null = collection.querySelector('li[data-collection-empty-explain]'),
        entry = document.createElement('li'),
        counter = collection.childNodes.length + 1,
        content = prototype.replace(new RegExp('__name__', 'g'), counter.toString()),
        event = new CustomEvent('collection-add-entry', {detail: new CollectionEventPayload(collection, entry)});

    entry.innerHTML = content;
    entry.classList.add('entry');

    if ("dataCollectionRegular" in collection.dataset) {
        initializeRemove(collection, entry);
        if (empty_explain !== null) {
            empty_explain.remove();
        }
    }

    collection.appendChild(entry);
    collection.dispatchEvent(event);
    window.dispatchEvent(event);
};

const initializeRemove = (collection: HTMLUListElement, entry: HTMLLIElement): void => {
    const button = buildRemoveButton(collection, entry);
    if (null === button) {
        return;
    }
    entry.appendChild(button);
};

export const buildRemoveButton = (collection: HTMLUListElement, entry: HTMLLIElement): HTMLButtonElement|null => {

    let
        button = document.createElement('button'),
        isPersisted = entry.dataset.collectionIsPersisted || '',
        content = collection.dataset.collectionButtonRemoveLabel || '',
        allowDelete = collection.dataset.collectionAllowDelete || '',
        event = new CustomEvent('collection-remove-entry', {detail: new CollectionEventPayload(collection, entry)});

    if (allowDelete === '0' && isPersisted === '1') {
        return null;
    }
    button.classList.add('btn', 'btn-delete', 'remove-entry');
    button.textContent = content;
    button.addEventListener('click', (e: Event) => {
        e.preventDefault();
        entry.remove();
        collection.dispatchEvent(event);
        window.dispatchEvent(event);
    });

    return button;
}

window.addEventListener('load', () => {
    let
        addButtons: NodeListOf<HTMLButtonElement> = document.querySelectorAll("button[data-collection-add-target]"),
        collections: NodeListOf<HTMLUListElement> = document.querySelectorAll("ul[data-collection-regular]");

    for (let i = 0; i < addButtons.length; i++) {
        let addButton = addButtons[i];
        addButton.addEventListener('click', (e: Event) => {
            e.preventDefault();
            handleAdd(e.target);
        });
    }
    for (let i = 0; i < collections.length; i++) {
        let entries: NodeListOf<HTMLLIElement> = collections[i].querySelectorAll(':scope > li');
        for (let j = 0; j < entries.length; j++) {
            if (entries[j].dataset.collectionEmptyExplain === "1") {
                continue;
            }
            initializeRemove(collections[i], entries[j]);
        }
    }
});