MLPChan filter

function add_filter(type, filter) {
    // Get the current filters
    var filters = (localStorage.filters !== undefined ? JSON.parse(localStorage.filters) : []);

    // Add filter
    filters.push({type : type, filter : filter});
    localStorage.filters = JSON.stringify(filters);
}

function remove_filter(type, filter) {
    // Get the current filters
    var filters = (localStorage.filters !== undefined ? JSON.parse(localStorage.filters) : []);

    // Loop through filters
    for (var i = 0; i < filters.length; i++) {
        if (filters[i].type == type && filters[i].filter == filter) {
            // Remove any matches
            filters.splice(i, 1);
        }
    }

    localStorage.filters = JSON.stringify(filters);
}

/**    Simple JavaScript filter
 *  Filters posts that match <rule>
 *
 *  rule format
 *      {
 *        name   : <poster name>
 *        trip   : <poster trip>
 *        email  : <poster email>
 *        subject: <post subject>
 *      }
 *
 * apply_filter(rule)
 *      Hides all posts that match <rule>
 *
 * add_filter(rule)
 *      Applys the filter <rule>, then stores the rule in localStorage
 *
 * apply_all_filters()
 *      Applys all the filters in localStorage, should be used on page load
**/

function apply_filter (rule) {
    if (!rule) { return; }

    // Loop through all the posts
    $(".postContainer").filter(function (index) {
        // Fetch the post from the DOM
        //      avoiding use of `this' because JSLint won't stop whining
        var post = $(".postContainer")[index];

        // If a post matches a rule, hide the post
        if ($(post).find(".name").text() == rule.name) {
            $(post).hide();
        }
        if ($(post).find(".trip").text() == rule.trip) {
            $(post).hide();
        }
        if ($(post).find(".email").attr("href") == "mailto:" + rule.email) {
            $(post).hide();
        }
        if ($(post).find(".subject").text() == rule.subject) {
            $(post).hide();
        }

        return;
    });
}

// Add a filter to the localStorage
function add_filter (rule) {
    if (!rule) { return; }

    // Apply the filter first
    apply_filter(rule);

    // Get all of the stored filters
    var filters = [];
    if (localStorage.filters) { filters = JSON.parse(localStorage.filters); }

    // Add the new filter and store it in localStorage
    filters.push(rule);
    localStorage.filters = JSON.stringify(filters);

    return;
}

function remove_filter (rule) {
    if (!rule) { return; }
    if (!localStorage.filters) { return; }

    // Get all of the stored filters
    var filters = JSON.parse(localStorage.filters);
    var new_filters = [];

    // Loop through the rules
    for  (var i = 0; i < filters.length; i++) {
        // Remove any rules that match
        if (JSON.stringify(filters[i]) == JSON.stringify(rule)) {
            continue;
        }

        new_filters.push(filters[i]);
    }

    // Put the left over filters in the localStorage
    localStorage.filters = JSON.stringify(new_filters);

    return;
}

// Apply all filters in the localStorage
function apply_all_filters () {
    if (!localStorage.filters) { return; }

    // Get all of the stored filters
    var filters = JSON.parse(localStorage.filters);

    // Loop through the rules and apply them
    for (var i = 0; i < filters.length; i++) { apply_filter( filters[i] ); }

    return;
}