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'use strict';
const api = require('../api.js');
const router = require('../router.js');
const views = require('../util/views.js');
const topNavigation = require('../models/top_navigation.js');
const Post = require('../models/post.js');
const PostMetric = require('../models/post_metric.js');
const PostMetricRange = require('../models/post_metric_range.js');
const PostList = require('../models/post_list.js');
const MetricSorterView = require('../views/metric_sorter_view.js');
const EmptyView = require('../views/empty_view.js');
const LEFT = 'left';
const RIGHT = 'right';
class MetricSorterController {
constructor(ctx) {
if (!api.hasPrivilege('posts:view') ||
!api.hasPrivilege('metrics:edit:posts')) {
this._view = new EmptyView();
this._view.showError('You don\'t have privileges to edit post metric values.');
return;
}
topNavigation.activate('posts');
topNavigation.setTitle('Sorting metrics');
this._ctx = ctx;
this._metricNames = (ctx.parameters.metrics || '')
.split(' ')
.filter(m => m);
if (!this._metricNames.length) {
this._view = new EmptyView();
this._view.showError('No metrics selected');
return;
}
this._primaryMetricName = this._metricNames[0];
this._view = new MetricSorterView({
primaryMetric: this._primaryMetricName,
greaterPost: RIGHT,
});
this._view.addEventListener('submit', e => this._evtSubmit(e));
this._view.addEventListener('skip', e => this._evtSkip(e));
this._view.addEventListener('changeMetric', e => this._evtChangeMetric(e));
if (ctx.parameters.id === 'random') {
this.startSortingRandomPost();
} else {
this.startSortingPost(ctx.parameters.id);
}
}
startSortingPost(id) {
this._view.clearMessages();
this._foundExactValue = false;
Post.get(id).then(post => {
this._unsortedPost = post;
this._view.installLeftPost(post);
this.reloadMedianPost();
}).catch(error => {
this._view.showError(error.message)
});
}
startSortingRandomPost() {
this._view.clearMessages();
this._getRandomUnsortedPostId().then(id => {
this._ctx.parameters.id = id;
router.replace(views.getMetricSorterUrl(id, this._ctx.parameters));
this.startSortingPost(id);
}).catch(error => {
this._view.showError(error.message)
});
}
reloadMedianPost() {
const metricName = this._primaryMetricName;
let range = this._getOrCreateRange(this._unsortedPost, metricName);
this._tryGetMedianPost(metricName, range).then(medianResponse => {
if (medianResponse.post) {
this._sortedPost = medianResponse.post;
this._view.installRightPost(this._sortedPost);
} else {
// No existing metrics, apply the median value
this._foundExactValue = true;
let exactValue = (medianResponse.range.low + medianResponse.range.high) / 2;
this._view.showSuccess(`Found exact value: ${exactValue}`);
this._setExactMetric(this._unsortedPost, metricName, exactValue);
//TODO: maybe allow to set exact value?
}
}).catch(error => {
this._view.showError(error.message)
});
}
_getRandomUnsortedPostId() {
let unsetMetricsQuery = this._metricNames
.map(m => `${m} -metric:${m}`)
.join(' ');
let filterQuery = this._ctx.parameters.query || '';
let unsetFullQuery = `${filterQuery} ${unsetMetricsQuery} sort:random`;
return PostList.search(unsetFullQuery,
this._ctx.parameters.skips || 0, 1, ['id']).then(response => {
if (!response.results.length) {
return Promise.reject(new Error('No posts found'));
} else {
return Promise.resolve(response.results.at(0).id);
}
});
}
_tryGetMedianPost(metric, range) {
let low = range.low + 0.000000001;
let high = range.high - 0.000000001;
let median_query = `metric-${metric}:${low}..${high} sort:metric-${metric}`;
return PostList.getMedian(median_query, []).then(response => {
return Promise.resolve({
range: range,
post: response.results.at(0)
});
});
}
_getOrCreateRange(post, metricName) {
let range = post.metricRanges.findByTagName(metricName);
if (!range) {
let tag = post.tags.findByName(metricName);
range = PostMetricRange.create(post.id, tag);
post.metricRanges.add(range);
}
return range;
}
_setExactMetric(post, metricName, value) {
let range = post.metricRanges.findByTagName(metricName);
if (!range) {
post.metricRanges.remove(range);
}
let tag = post.tags.findByName(metricName);
let exactMetric = PostMetric.create(post.id, tag);
exactMetric.value = value;
post.metrics.add(exactMetric);
}
_evtSubmit(e) {
let range = this._getOrCreateRange(this._unsortedPost, this._primaryMetricName);
if (this._foundExactValue) {
this._unsortedPost.metricRanges.remove(range);
} else {
let medianValue = this._sortedPost.metrics.findByTagName(this._primaryMetricName).value;
if (e.detail.greaterPost === LEFT) {
range.low = medianValue;
} else {
range.high = medianValue;
}
}
this._unsortedPost.save().then(() => {
if (this._foundExactValue) {
this.startSortingRandomPost();
} else {
this.reloadMedianPost();
}
}, error => {
this._view.showError(error.message)
});
}
_evtSkip(e) {
this._ctx.parameters.skips = (this._ctx.parameters.skips || 0) + 1;
this.startSortingRandomPost();
}
_evtChangeMetric(e) {
// this._primaryMetricName = e.detail.metricName;
}
}
module.exports = router => {
router.enter(
['post', ':id', 'metric-sorter'],
(ctx, next) => {
ctx.controller = new MetricSorterController(ctx);
});
};
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