/*
 * Rule: Don't use classes or IDs with elements (a.foo or a#foo).
 */

CSSLint.addRule({

    //rule information
    id: "overqualified-elements",
    name: "Disallow overqualified elements",
    desc: "Don't use classes or IDs with elements (a.foo or a#foo).",
    url: "https://github.com/CSSLint/csslint/wiki/Disallow-overqualified-elements",
    browsers: "All",

    //initialization
    init: function(parser, reporter) {
        "use strict";
        var rule = this,
            classes = {};

        parser.addListener("startrule", function(event) {
            var selectors = event.selectors,
                selector,
                part,
                modifier,
                i, j, k;

            for (i=0; i < selectors.length; i++) {
                selector = selectors[i];

                for (j=0; j < selector.parts.length; j++) {
                    part = selector.parts[j];
                    if (part.type === parser.SELECTOR_PART_TYPE) {
                        for (k=0; k < part.modifiers.length; k++) {
                            modifier = part.modifiers[k];
                            if (part.elementName && modifier.type === "id") {
                                reporter.report("Element (" + part + ") is overqualified, just use " + modifier + " without element name.", part.line, part.col, rule);
                            } else if (modifier.type === "class") {

                                if (!classes[modifier]) {
                                    classes[modifier] = [];
                                }
                                classes[modifier].push({ modifier: modifier, part: part });
                            }
                        }
                    }
                }
            }
        });

        parser.addListener("endstylesheet", function() {

            var prop;
            for (prop in classes) {
                if (classes.hasOwnProperty(prop)) {

                    //one use means that this is overqualified
                    if (classes[prop].length === 1 && classes[prop][0].part.elementName) {
                        reporter.report("Element (" + classes[prop][0].part + ") is overqualified, just use " + classes[prop][0].modifier + " without element name.", classes[prop][0].part.line, classes[prop][0].part.col, rule);
                    }
                }
            }
        });
    }

});
