var _ = require('underscore')._;

var api = function(dbot) {
    return {
        /**
         * Does the user have the correct access level to use the command?
         */
        'hasAccess': function(user, channel, command, callback) {
            var accessNeeded = dbot.commands[command].access;

            if(accessNeeded == 'admin' || accessNeeded == 'moderator' ||
                    accessNeeded == 'power_user' || accessNeeded == 'voice') {
                var allowedNicks = dbot.config.admins;
                if(accessNeeded == 'moderator') allowedNicks = _.union(allowedNicks, dbot.config.moderators); 
                if(accessNeeded == 'power_user') {
                    allowedNicks = _.union(allowedNicks, dbot.config.moderators); 
                    allowedNicks = _.union(allowedNicks, dbot.config.power_users);
                }
                if(accessNeeded == 'voice') {
                    allowedNicks = _.union(allowedNicks, dbot.config.moderators); 
                    allowedNicks = _.union(allowedNicks, dbot.config.power_users);
                    allowedNicks = _.union(allowedNicks, 
                        _.chain(channel.nicks)
                         .filter(function(nick) {
                            return nick.op == true || nick.voice == true; 
                          })
                         .pluck('name')
                         .value());
                }

                if(!_.include(allowedNicks, user.primaryNick)) {
                    callback(false);
                } else {
                    if(_.has(dbot.modules, 'nickserv') && this.config.useNickserv == true) {
                        dbot.api.nickserv.auth(user.server, user.currentNick, function(result, primary) {
                            if(result == true && primary == user.primaryNick) {
                                callback(true);
                            } else {
                                callback(false);
                            }
                        });
                    } else {
                        callback(true);
                    }
                }
            } else {
                callback(true);
            }
        },

        /**
         * Apply Regex to event message, store result. Return false if it doesn't
         * apply.
         */
        'applyRegex': function(commandName, event) {
            var applies = false;
            event.message = event.message.substring(1);
            if(_.has(dbot.commands[commandName], 'regex')) {
                var cRegex = dbot.commands[commandName].regex;
                if(_.isArray(cRegex) && cRegex.length === 2) {
                    var q = event.message.valMatch(cRegex[0], cRegex[1]);
                    if(q) {
                        applies = true;
                        event.input = q;
                    }
                } else {
                    var q = event.message.match(cRegex);
                    if(q) {
                        applies = true;
                        event.input = q;
                    }
                }
            } else {
                applies = true;
            }
            return applies;
        }
    };
};

exports.fetch = function(dbot) {
    return api(dbot);
};