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// TODO: proper backwards search - implement our own component?
//     : implement our own highlighter?
//     : frameset pages
//     : <ESC> should cancel search highlighting in 'incsearch' mode and jump
//       back to the presearch page location - can probably use the same
//       solution as marks
//     : 'linksearch' searches should highlight link matches only
//     : changing any search settings should also update the search state including highlighting
//     : incremental searches shouldn't permanently update search modifiers

// make sure you only create this object when the "vimperator" object is ready
function Search() //{{{
{
    var self = this;                   // needed for callbacks since "this" is the "vimperator" object in a callback
    var found = false;                 // true if the last search was successful
    var backwards = false;             // currently searching backwards
    var search_string = "";            // current search string (without modifiers)
    var search_pattern = "";           // current search string (includes modifiers)
    var last_search_pattern = "";      // the last searched pattern (includes modifiers)
    var last_search_string = "";       // the last searched string (without modifiers)
    var last_search_backwards = false; // like "backwards", but for the last search, so if you cancel a search with <esc> this is not set
    var case_sensitive = false;        // search string is case sensitive
    var links_only = false;            // search is limited to link text only

    // Event handlers for search - closure is needed
    vimperator.registerCallback("change", vimperator.modes.SEARCH_FORWARD, function(command) { self.searchKeyPressed(command); });
    vimperator.registerCallback("submit", vimperator.modes.SEARCH_FORWARD, function(command) { self.searchSubmitted(command); });
    vimperator.registerCallback("cancel", vimperator.modes.SEARCH_FORWARD, function() { self.searchCanceled(); });
    // TODO: allow advanced modes in register/triggerCallback
    vimperator.registerCallback("change", vimperator.modes.SEARCH_BACKWARD, function(command) { self.searchKeyPressed(command); });
    vimperator.registerCallback("submit", vimperator.modes.SEARCH_BACKWARD, function(command) { self.searchSubmitted(command); });
    vimperator.registerCallback("cancel", vimperator.modes.SEARCH_BACKWARD, function() { self.searchCanceled(); });

    // set search_string, search_pattern, case_sensitive, links_only
    function processUserPattern(pattern)
    {
        // strip off pattern terminator and offset
        if (backwards)
            pattern = pattern.replace(/\?.*/, "");
        else
            pattern = pattern.replace(/\/.*/, "");

        search_pattern = pattern;

        // case sensitivity - \c wins if both modifiers specified
        if (/\c/.test(pattern))
            case_sensitive = false;
        else if (/\C/.test(pattern))
            case_sensitive = true;
        else if (vimperator.options["ignorecase"] && vimperator.options["smartcase"] && /[A-Z]/.test(pattern))
            case_sensitive = true;
        else if (vimperator.options["ignorecase"])
            case_sensitive = false;
        else
            case_sensitive = true;

        // links only search - \u wins if both modifiers specified
        if (/\\u/.test(pattern))
            links_only = false;
        else if (/\U/.test(pattern))
            links_only = true;
        else if (vimperator.options["linksearch"])
            links_only = true;
        else
            links_only = false;

        // strip modifiers
        pattern = pattern.replace(/(\\)?\\[cCuU]/g, function($0, $1) { return $1 ? $0 : "" });

        // remove the modifer escape \
        pattern = pattern.replace(/\\(\\[cCuU])/g, '$1')

        search_string = pattern;
    }

    // Called when the search dialog is asked for
    // If you omit "mode", it will default to forward searching
    this.openSearchDialog = function(mode)
    {
        if (mode == vimperator.modes.SEARCH_BACKWARD)
        {
            vimperator.commandline.open("?", "", vimperator.modes.SEARCH_BACKWARD);
            backwards = true;
        }
        else
        {
            vimperator.commandline.open("/", "", vimperator.modes.SEARCH_FORWARD);
            backwards = false;
        }

        // TODO: focus the top of the currently visible screen
    }

    // Finds text in a page
    // TODO: backwards seems impossible i fear :(
    this.find = function(str, backwards)
    {
        var fastFind = getBrowser().fastFind;

        processUserPattern(str);

        fastFind.caseSensitive = case_sensitive;
        found = fastFind.find(search_string, links_only) != Components.interfaces.nsITypeAheadFind.FIND_NOTFOUND;

        if (!found)
            vimperator.echoerr("E486: Pattern not found: " + search_pattern);

        return found;
    }

    // Called when the current search needs to be repeated
    this.findAgain = function(reverse)
    {
        // this hack is needed to make n/N work with the correct string, if
        // we typed /foo<esc> after the original search.  Since searchString is
        // readonly we have to call find() again to update it.
        if (getBrowser().fastFind.searchString != last_search_string)
            this.find(last_search_string, false);

        var up = reverse ? !last_search_backwards : last_search_backwards;
        var result;

        if (up)
            result = getBrowser().fastFind.findPrevious();
        else
            result = getBrowser().fastFind.findNext();

        if (result == Components.interfaces.nsITypeAheadFind.FIND_NOTFOUND)
        {
            vimperator.echoerr("E486: Pattern not found: " + last_search_pattern);
        }
        else if (result == Components.interfaces.nsITypeAheadFind.FIND_WRAPPED)
        {
            // hack needed, because wrapping causes a "scroll" event which clears
            // our command line
            setTimeout(function() {
                if (up)
                    vimperator.echoerr("search hit TOP, continuing at BOTTOM");
                else
                    vimperator.echoerr("search hit BOTTOM, continuing at TOP");
            }, 0);
        }
        else
        {
            vimperator.echo((up ? "?" : "/") + last_search_pattern);

            if (vimperator.options["hlsearch"])
                this.highlight(last_search_string);
        }
    }

    // Called when the user types a key in the search dialog. Triggers a find attempt if 'incsearch' is set
    this.searchKeyPressed = function(command)
    {
        if (vimperator.options["incsearch"])
            this.find(command, backwards);
    }

    // Called when the enter key is pressed to trigger a search
    // use forced_direction if you call this function directly
    this.searchSubmitted = function(command, forced_backward)
    {
        if (typeof forced_backward === "boolean")
            backwards = forced_backward;

        // use the last pattern if none specified
        if (!command)
            command = last_search_pattern;

        this.clear();
        this.find(command, backwards);

        last_search_backwards = backwards;
        last_search_pattern = command.replace(backwards ? /\?.*/ : /\/.*/, ""); // XXX
        last_search_string = search_string;

        // TODO: move to find() when reverse incremental searching is kludged in
        // need to find again for reverse searching
        if (backwards)
            setTimeout(function() { self.findAgain(false); }, 0);

        if (vimperator.options["hlsearch"])
            this.highlight(search_string);

        vimperator.setMode(vimperator.modes.NORMAL);
        vimperator.focusContent();
    }

    // Called when the search is cancelled - for example if someone presses
    // escape while typing a search
    this.searchCanceled = function()
    {
        //removeMode(MODE_SEARCH);
        vimperator.setMode(vimperator.modes.NORMAL);
        vimperator.focusContent();
    }

    this.highlight = function(text)
    {
        // already highlighted?
        if (window.content.document.getElementById("__firefox-findbar-search-id"))
            return;

        if (!text)
            text = last_search_string;

        // NOTE: setCaseSensitivity() in FF2 does NOT set the
        // accessibility.typeaheadfind.casesensitive pref as needed by
        // highlightDoc()
        gFindBar.mTypeAheadCaseSensitive = case_sensitive ? 1 : 0;
        gFindBar.highlightDoc("white", "black", text);

        // TODO: seems fast enough for now
        // NOTE: FF2 highlighting spans all have this id rather than a class attribute
        var spans = vimperator.buffer.evaluateXPath('//span[@id="__firefox-findbar-search-id"]')
        for (var i = 0; i < spans.snapshotLength; i++)
            spans.snapshotItem(i).setAttribute("style", vimperator.options["hlsearchstyle"]);

        // recreate selection since _highlightDoc collapses the selection backwards
        getBrowser().fastFind.findNext();

        // TODO: remove highlighting from non-link matches (HTML - A/AREA with href attribute; XML - Xlink [@type="simple"])
    }

    this.clear = function()
    {
        gFindBar.highlightDoc();
        // need to manually collapse the selection if the document is not
        // highlighted
        getBrowser().fastFind.collapseSelection();
    }

} //}}}

// vim: set fdm=marker sw=4 ts=4 et: