71 lines
1.9 KiB
JavaScript
71 lines
1.9 KiB
JavaScript
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var App = App || {};
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App.Services = App.Services || {};
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App.Services.PostsAroundCalculator = function(_, promise, util, pager) {
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pager.init({url: '/posts'});
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function resetCache() {
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pager.resetCache();
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}
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function getLinksToPostsAround(searchParams, page, postId) {
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return promise.make(function(resolve, reject) {
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pager.setSearchParams(searchParams);
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pager.setPage(page);
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promise.wait(pager.retrieveCached())
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.then(function(response) {
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var postIds = _.pluck(response.entities, 'id');
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var position = _.indexOf(postIds, postId);
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if (position === -1) {
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resolve(null, null);
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}
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promise.wait(
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getLinkToPostAround(postIds, position, page, -1),
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getLinkToPostAround(postIds, position, page, 1))
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.then(function(nextPostUrl, prevPostUrl) {
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resolve(nextPostUrl, prevPostUrl);
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});
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});
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});
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}
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function getLinkToPostAround(postIds, position, page, direction) {
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return promise.make(function(resolve, reject) {
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if (position + direction >= 0 && position + direction < postIds.length) {
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var url = util.compileComplexRouteArgs(
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'#/post/' + postIds[position + direction],
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_.extend({page: page}, pager.getSearchParams()));
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resolve(url);
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} else if (page + direction >= 1) {
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pager.setPage(page + direction);
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promise.wait(pager.retrieveCached()).then(function(response) {
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if (response.entities.length) {
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var post = direction === - 1 ?
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_.last(response.entities) :
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_.first(response.entities);
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var url = util.compileComplexRouteArgs(
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'#/post/' + post.id,
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_.extend({page: page + direction}, pager.getSearchParams()));
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resolve(url);
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} else {
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resolve(null);
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}
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});
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} else {
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resolve(null);
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}
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});
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}
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return {
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resetCache: resetCache,
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getLinksToPostsAround: getLinksToPostsAround,
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};
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};
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App.DI.register('postsAroundCalculator', ['_', 'promise', 'util', 'pager'], App.Services.PostsAroundCalculator);
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