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var is = require('is');
var removeArticle = require('./removeArticle');
var insertArticle = require('./insertArticle');
/**
Returns a new summary, with the an article moved after another
article. Unlike `moveArticle`, does not ensure that the article
will be found at the target's level plus one.
@param {Summary} summary
@param {String|SummaryArticle} origin
@param {String|SummaryArticle} afterTarget
@return {Summary}
*/
function moveArticleAfter(summary, origin, afterTarget) {
// Coerce to level
var originLevel = is.string(origin)? origin : origin.getLevel();
var afterTargetLevel = is.string(afterTarget)? afterTarget : afterTarget.getLevel();
var article = summary.getByLevel(originLevel);
var targetLevel = increment(afterTargetLevel);
if (targetLevel < origin) {
// Remove first
var removed = removeArticle(summary, originLevel);
// Insert then
return insertArticle(removed, article, targetLevel);
} else {
// Insert right after first
var inserted = insertArticle(summary, article, targetLevel);
// Remove old one
return removeArticle(inserted, originLevel);
}
}
/**
@param {String}
@return {Array<Number>}
*/
function levelToArray(l) {
return l.split('.').map(function (char) {
return parseInt(char, 10);
});
}
/**
@param {Array<Number>}
@return {String}
*/
function arrayToLevel(a) {
return a.join('.');
}
function increment(level) {
level = levelToArray(level);
level[level.length - 1]++;
return arrayToLevel(level);
}
module.exports = moveArticleAfter;
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