var config = require("ace/config");
var event = require("ace/lib/event");
var modelist = require("ace/ext/modelist");

module.exports = function(editor) {
    event.addListener(editor.container, "dragover", function(e) {
        var types = e.dataTransfer.types;
        if (types && Array.prototype.indexOf.call(types, 'Files') !== -1)
            return event.preventDefault(e);
    });

    event.addListener(editor.container, "drop", function(e) {
        var file;
        try {
            file = e.dataTransfer.files[0];
            if (window.FileReader) {
                var reader = new FileReader();
                reader.onload = function() {
                    var mode = modelist.getModeForPath(file.name);
                    editor.session.doc.setValue(reader.result);
                    editor.session.setMode(mode.mode);
                    editor.session.modeName = mode.name;
                };
                reader.readAsText(file);
            }
            return event.preventDefault(e);
        } catch(err) {
            return event.stopEvent(e);
        }
    });
};

var Editor = require("ace/editor").Editor;
config.defineOptions(Editor.prototype, "editor", {
    loadDroppedFile: {
        set: function() { module.exports(this); },
        value: true
    }
});