/***** BEGIN LICENSE BLOCK ***** {{{
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The contents of this file are subject to the Mozilla Public License Version
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Software distributed under the License is distributed on an "AS IS" basis,
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(c) 2006-2007: Martin Stubenschrott <stubenschrott@gmx.net>

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vimperator.modes = (function()
{
	var main = 1;     // NORMAL
	var extended = 0; // NONE

	var passNextKey = false;
	var passAllKeys = false;

	function getModeMessage()
	{
		if (passNextKey && !passAllKeys)
			return "PASS THROUGH (next)";
		else if (passAllKeys && !passNextKey)
			return "PASS THROUGH";

		var ext = "";
	    switch (extended)
		{
			case vimperator.modes.QUICK_HINT:
				ext = " (quick)"; break;
			case vimperator.modes.EXTENDED_HINT:
				ext = " (extended)"; break;
			case vimperator.modes.ALWAYS_HINT:
				ext = " (always)"; break;
			case vimperator.modes.MENU: // TODO: desirable?
				ext = " (menu)"; break;
		}
		
	    switch (main)
	    {
			case vimperator.modes.INSERT:
				return "INSERT" + ext;
			case vimperator.modes.VISUAL:
				return (extended & vimperator.modes.LINE) ? "VISUAL LINE" + ext : "VISUAL" + ext;
			case vimperator.modes.HINTS:
				return "HINTS" + ext;
			case vimperator.modes.CARET:
				return "CARET" + ext;
			case vimperator.modes.TEXTAREA:
				return "TEXTAREA" + ext;
			default:
				return null;
	    }
	}

	function handleModeChange(oldmode, newmode)
	{
		vimperator.log("switching from mode " + oldmode + " to mode " + newmode, 7);

		switch (oldmode)
		{
			case vimperator.modes.TEXTAREA:
			case vimperator.modes.INSERT:
				vimperator.editor.unselectText();
				break;

			case vimperator.modes.VISUAL:
				if (newmode == vimperator.modes.CARET)
				{
                    // clear any selection made
                    var selection = window.content.getSelection();
                    if (selection)
                        selection.collapseToStart();
				}
				else
					vimperator.editor.unselectText();
				break;

			case vimperator.modes.HINTS:
				// XXX: for now this does not work, but later it should be here
				// vimperator.hints.disableHahMode();
				break;
		}

		if (newmode == vimperator.modes.NORMAL)
		{
			var value = Options.getFirefoxPref("accessibility.browsewithcaret", false);
			if (value)
				Options.setFirefoxPref("accessibility.browsewithcaret", false);

			vimperator.statusline.updateUrl();
			vimperator.focusContent();
		}
	}

	return {
		// main modes, only one should ever be active
		NONE:             0,
		NORMAL:           1 << 0,
		INSERT:           1 << 1,
		VISUAL:           1 << 2,
		HINTS:            1 << 3,
		COMMAND_LINE:     1 << 4,
		CARET:            1 << 5, // text cursor is visible
		TEXTAREA:         1 << 6, // text cursor is in a HTMLTextAreaElement
		// extended modes, can include multiple modes, and even main modes
		EX:               1 << 10,
		INPUT_MULTILINE:  1 << 11,
		OUTPUT_MULTILINE: 1 << 12,
		SEARCH_FORWARD:   1 << 13,
		SEARCH_BACKWARD:  1 << 14,
		QUICK_HINT:       1 << 15,
		EXTENDED_HINT:    1 << 16,
		ALWAYS_HINT:      1 << 17,
		MENU:             1 << 18, // a popupmenu is active
		LINE:             1 << 19, // linewise visual mode

		reset: function(silent)
		{
			this.set(vimperator.modes.NORMAL, vimperator.modes.NONE, silent);
		},

		show: function()
		{
			if (!vimperator.options["showmode"])
				return;

			// never show mode messages if we are in command line mode
			if (main == vimperator.modes.COMMAND_LINE)
				return;

			var msg = getModeMessage();
			if (msg)
				vimperator.commandline.echo("-- " + getModeMessage() + " --");
			else 
				vimperator.commandline.echo("");
		},

		// helper function to set both modes in one go
        set: function(main_mode, extended_mode, silent)
        {
            // if a main mode is set, the extended is always cleared
            if (typeof main_mode === "number")
            {
				if (main_mode != main)
					handleModeChange(main, main_mode);

                main = main_mode;
				if (!extended_mode)
					extended = vimperator.modes.NONE;

            }
            if (typeof extended_mode === "number")
                extended = extended_mode;

			if (!silent)
				this.show();
        },

		// add/remove always work on the extended mode only
		add: function(mode)
		{
		    extended |= mode;
			this.show();
		},
		remove: function(mode)
		{
		    extended = (extended | mode) ^ mode;
			this.show();
		},

		get passNextKey() { return passNextKey; },
		set passNextKey(value) { passNextKey = value; this.show(); },

		get passAllKeys() { return passAllKeys; },
		set passAllKeys(value) { passAllKeys = value; this.show(); },
		
		get main()      { return main; },
		set main(value) {
			if (value != main)
				handleModeChange(main, value);

			main = value;
			// setting the main mode always resets any extended mode
			extended = vimperator.modes.NONE;
			this.show();
		},

		get extended()      { return extended; },
		set extended(value) {
			extended = value; this.show();
		}
	}
})();