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 *       notice, this list of conditions and the following disclaimer.
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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define(function(require, exports, module) {

var config = require("../config"),
    Occur = require("../occur").Occur;

// These commands can be installed in a normal command handler to start occur:
var occurStartCommand = {
    name: "occur",
    exec: function(editor, options) {
        var alreadyInOccur = !!editor.session.$occur;
        var occurSessionActive = new Occur().enter(editor, options);
        if (occurSessionActive && !alreadyInOccur)
            OccurKeyboardHandler.installIn(editor);
    },
    readOnly: true
};

var occurCommands = [{
    name: "occurexit",
    bindKey: 'esc|Ctrl-G',
    exec: function(editor) {
        var occur = editor.session.$occur;
        if (!occur) return;
        occur.exit(editor, {});
        if (!editor.session.$occur) OccurKeyboardHandler.uninstallFrom(editor);
    },
    readOnly: true
}, {
    name: "occuraccept",
    bindKey: 'enter',
    exec: function(editor) {
        var occur = editor.session.$occur;
        if (!occur) return;
        occur.exit(editor, {translatePosition: true});
        if (!editor.session.$occur) OccurKeyboardHandler.uninstallFrom(editor);
    },
    readOnly: true
}];

var HashHandler = require("../keyboard/hash_handler").HashHandler;
var oop = require("../lib/oop");


function OccurKeyboardHandler() {}

oop.inherits(OccurKeyboardHandler, HashHandler);

(function() {

    this.isOccurHandler = true;

    this.attach = function(editor) {
        HashHandler.call(this, occurCommands, editor.commands.platform);
        this.$editor = editor;
    }

    var handleKeyboard$super = this.handleKeyboard;
    this.handleKeyboard = function(data, hashId, key, keyCode) {
        var cmd = handleKeyboard$super.call(this, data, hashId, key, keyCode);
        return (cmd && cmd.command) ? cmd : undefined;
    }

}).call(OccurKeyboardHandler.prototype);

OccurKeyboardHandler.installIn = function(editor) {
    var handler = new this();
    editor.keyBinding.addKeyboardHandler(handler);
    editor.commands.addCommands(occurCommands);
}

OccurKeyboardHandler.uninstallFrom = function(editor) {
    editor.commands.removeCommands(occurCommands);
    var handler = editor.getKeyboardHandler();
    if (handler.isOccurHandler)
        editor.keyBinding.removeKeyboardHandler(handler);
}

exports.occurStartCommand = occurStartCommand;

});
