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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
vimperator.Search = function () //{{{
{
    ////////////////////////////////////////////////////////////////////////////////
    ////////////////////// PRIVATE SECTION /////////////////////////////////////////
    /////////////////////////////////////////////////////////////////////////////{{{

    // FIXME:
    //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 searchString = "";           // current search string (without modifiers)
    var searchPattern = "";          // current search string (includes modifiers)
    var lastSearchPattern = "";      // the last searched pattern (includes modifiers)
    var lastSearchString = "";       // the last searched string (without modifiers)
    var lastSearchBackwards = false; // like "backwards", but for the last search, so if you cancel a search with <esc> this is not set
    var caseSensitive = false;       // search string is case sensitive
    var linksOnly = false;           // search is limited to link text only

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

    // set searchString, searchPattern, caseSensitive, linksOnly
    function processUserPattern(pattern)
    {
        // strip off pattern terminator and offset
        if (backwards)
            pattern = pattern.replace(/\?.*/, "");
        else
            pattern = pattern.replace(/\/.*/, "");

        searchPattern = pattern;

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

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

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

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

        // remove any modifer escape \
        pattern = pattern.replace(/\\(\\[cClL])/g, "$1");

        searchString = pattern;
    }

    /////////////////////////////////////////////////////////////////////////////}}}
    ////////////////////// PUBLIC SECTION //////////////////////////////////////////
    /////////////////////////////////////////////////////////////////////////////{{{

    return {

        // Called when the search dialog is asked for
        // If you omit "mode", it will default to forward searching
        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 :(
        find: function (str, backwards)
        {
            var fastFind = getBrowser().fastFind;

            processUserPattern(str);

            fastFind.caseSensitive = caseSensitive;
            found = fastFind.find(searchString, linksOnly) != Components.interfaces.nsITypeAheadFind.FIND_NOTFOUND;

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

            return found;
        },

        // Called when the current search needs to be repeated
        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 != lastSearchString)
                this.find(lastSearchString, false);

            var up = reverse ? !lastSearchBackwards : lastSearchBackwards;
            var result = getBrowser().fastFind.findAgain(up, linksOnly);

            if (result == Components.interfaces.nsITypeAheadFind.FIND_NOTFOUND)
            {
                vimperator.echoerr("E486: Pattern not found: " + lastSearchPattern);
            }
            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.commandline.echo("search hit TOP, continuing at BOTTOM", vimperator.commandline.HL_WARNING);
                    else
                        vimperator.commandline.echo("search hit BOTTOM, continuing at TOP", vimperator.commandline.HL_WARNING);
                }, 0);
            }
            else
            {
                vimperator.echo((up ? "?" : "/") + lastSearchPattern, null, vimperator.commandline.FORCE_SINGLELINE);

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

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

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

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

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

            lastSearchBackwards = backwards;
            lastSearchPattern = command.replace(backwards ? /\?.*/ : /\/.*/, ""); // XXX
            lastSearchString = searchString;

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

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

            vimperator.modes.reset();
        },

        // Called when the search is canceled - for example if someone presses
        // escape while typing a search
        searchCanceled: function ()
        {
            this.clear();
            // TODO: code to reposition the document to the place before search started
        },

        // this is not dependent on the value of 'hlsearch'
        highlight: function (text)
        {
            // already highlighted?
            if (window.content.document.getElementsByClassName("__mozilla-findbar-search").length > 0)
                return;

            if (!text)
                text = lastSearchString;

            gFindBar._setCaseSensitivity(caseSensitive);
            gFindBar._highlightDoc("white", "black", text);

            // TODO: seems fast enough for now...just
            (function (win)
            {
                for (var i = 0; i < win.frames.length; i++)
                    arguments.callee(win.frames[i]);
                var spans = window.content.document.getElementsByClassName("__mozilla-findbar-search");
                for (var i = 0; i < spans.length; i++)
                    spans[i].setAttribute("style", vimperator.options["hlsearchstyle"]);
            })(window.content);

            // recreate selection since _highlightDoc collapses the selection backwards
            getBrowser().fastFind.findAgain(false, linksOnly);

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

        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: