/**
Provides pre-built result highlighters for AutoComplete.

@module autocomplete
@submodule autocomplete-highlighters
@class AutoCompleteHighlighters
@static
**/

var YArray    = Y.Array,
    Highlight = Y.Highlight,

Highlighters = Y.mix(Y.namespace('AutoCompleteHighlighters'), {
    // -- Public Methods -------------------------------------------------------

    /**
    Highlights any individual query character that occurs anywhere in a result.
    Case-insensitive.

    @method charMatch
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    charMatch: function (query, results, caseSensitive) {
        // The caseSensitive parameter is only intended for use by
        // charMatchCase(). It's intentionally undocumented.

        var queryChars = YArray.unique((caseSensitive ? query :
                query.toLowerCase()).split(''));

        return YArray.map(results, function (result) {
            return Highlight.all(result.text, queryChars, {
                caseSensitive: caseSensitive
            });
        });
    },

    /**
    Case-sensitive version of `charMatch()`.

    @method charMatchCase
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    charMatchCase: function (query, results) {
        return Highlighters.charMatch(query, results, true);
    },

    /**
    Highlights the complete query as a phrase anywhere within a result. Case-
    insensitive.

    @method phraseMatch
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    phraseMatch: function (query, results, caseSensitive) {
        // The caseSensitive parameter is only intended for use by
        // phraseMatchCase(). It's intentionally undocumented.

        return YArray.map(results, function (result) {
            return Highlight.all(result.text, [query], {
                caseSensitive: caseSensitive
            });
        });
    },

    /**
    Case-sensitive version of `phraseMatch()`.

    @method phraseMatchCase
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    phraseMatchCase: function (query, results) {
        return Highlighters.phraseMatch(query, results, true);
    },

    /**
    Highlights the complete query as a phrase at the beginning of a result.
    Case-insensitive.

    @method startsWith
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    startsWith: function (query, results, caseSensitive) {
        // The caseSensitive parameter is only intended for use by
        // startsWithCase(). It's intentionally undocumented.

        return YArray.map(results, function (result) {
            return Highlight.all(result.text, [query], {
                caseSensitive: caseSensitive,
                startsWith   : true
            });
        });
    },

    /**
    Case-sensitive version of `startsWith()`.

    @method startsWithCase
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    startsWithCase: function (query, results) {
        return Highlighters.startsWith(query, results, true);
    },

    /**
    Highlights portions of results in which words from the query match either
    whole words or parts of words in the result. Non-word characters like
    whitespace and certain punctuation are ignored. Case-insensitive.

    @method subWordMatch
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    subWordMatch: function (query, results, caseSensitive) {
        // The caseSensitive parameter is only intended for use by
        // subWordMatchCase(). It's intentionally undocumented.

        var queryWords = Y.Text.WordBreak.getUniqueWords(query, {
            ignoreCase: !caseSensitive
        });

        return YArray.map(results, function (result) {
            return Highlight.all(result.text, queryWords, {
                caseSensitive: caseSensitive
            });
        });
    },

    /**
    Case-sensitive version of `subWordMatch()`.

    @method subWordMatchCase
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    subWordMatchCase: function (query, results) {
        return Highlighters.subWordMatch(query, results, true);
    },

    /**
    Highlights individual words in results that are also in the query. Non-word
    characters like punctuation are ignored. Case-insensitive.

    @method wordMatch
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    wordMatch: function (query, results, caseSensitive) {
        // The caseSensitive parameter is only intended for use by
        // wordMatchCase(). It's intentionally undocumented.

        return YArray.map(results, function (result) {
            return Highlight.words(result.text, query, {
                caseSensitive: caseSensitive
            });
        });
    },

    /**
    Case-sensitive version of `wordMatch()`.

    @method wordMatchCase
    @param {String} query Query to match
    @param {Array} results Results to highlight
    @return {Array} Highlighted results
    @static
    **/
    wordMatchCase: function (query, results) {
        return Highlighters.wordMatch(query, results, true);
    }
});
