/**
 * Module Name: Command
 * Description: An essential module which maps PRIVMSG input to an appropriate
 * command and then runs that command, given the user isn't banned from or
 * ignoring that command.
 */
var _ = require('underscore')._,
    cDomain = require('domain').create();

var command = function(dbot) {
    /**
     * Run the appropriate command given the input.
     */
    this.listener = function(event) {
        var commandName = event.params[0];
        if(commandName.charAt(0) != this.config.commandPrefix || this.config.passiveMode == true) {
            return;
        }
        commandName = commandName.substring(1);
        if(!_.has(dbot.commands, commandName)) {
            if(_.has(dbot.modules, 'quotes')) {
                var key = event.message.substring(1);
                dbot.api.quotes.getInterpolatedQuote(event.server,
                        event.channel.name, event.user, key, function(quote) {
                    if(quote) {
                        event.reply(key + ': ' + quote);
                    } else if(_.has(dbot.modules, 'spelling')) {
                        var commands = _.keys(dbot.commands),
                            winner = false,
                            closestMatch = Infinity;

                        _.each(commands, function(command) {
                            var distance = dbot.api.spelling.distance(commandName, command);
                            if(distance < closestMatch) {
                                closestMatch = distance;
                                winner = command;
                            }
                        }); 

                        if(closestMatch < 1) {
                            event.reply(commandName + ' not found. Did you mean ' + winner + '?');
                            return;
                        } else if(_.has(dbot.modules, 'quotes')) {
                            dbot.api.link.udLookup(key, function(word, definition) {
                                if(word) {
                                    event.reply(key + '[UD]: ' + definition);
                                } else {
                                    event.reply(dbot.t('category_not_found', { 'category': key }));
                                }
                            });
                        } else {
                            return;
                        }
                    }
                });
                return;
            } else {
                return;
            }
        } 
       
        this.api.hasAccess(event, commandName, function(hasAccess) {
            dbot.api.ignore.isUserIgnoring(event.rUser, commandName, function(isIgnoring) {
                dbot.api.ignore.isUserBanned(event.rUser, commandName, function(isBanned) {
                    if(isBanned) {
                        if(this.config.banOutput && commandName != this.config.commandPrefix) {
                            event.reply(dbot.t('command_ban', {'user': event.user})); 
                        }
                    } else if(!hasAccess) {
                        if(this.config.accessOutput) {
                            event.reply(dbot.t('access_denied', { 'user': event.user }));
                        }
                    } else if(!isIgnoring && _.has(dbot.commands, commandName) && !dbot.commands[commandName].disabled) {
                        if(this.api.applyRegex(commandName, event)) {
                            try {
                                cDomain.run(function() {
                                    var command = dbot.commands[commandName],
                                        results;
                                    if(_.has(command, 'resolver')) {
                                        event.res = [];
                                        command.resolver(event, function(err) {
                                            if(!err) {
                                                results = command.apply(dbot.modules[command.module], [event]);
                                            }
                                        });
                                    } else {
                                        results = command.apply(dbot.modules[command.module], [event]);
                                    }
                                });
                            } catch(err) {
                                if(dbot.config.debugMode == true) {
                                    var stack = err.stack.split('\n').slice(1, dbot.config.debugLevel + 1);

                                    event.reply('- Error in ' + commandName + ':');
                                    event.reply('- Message: ' + err);

                                    _.each(stack, function(stackLine, index) {
                                        event.reply('- Stack[' + index + ']: ' +
                                            stackLine.trim());
                                    });
                                }
                            }
                            if(!_.include(['reload', 'load', 'unload', 'setconfig'], commandName)) dbot.api.event.emit('command', [ event ]);
                        } else {
                            if(commandName !== this.config.commandPrefix) {
                                if(_.has(dbot.usage, commandName)) {
                                    event.reply('Usage: ' + dbot.usage[commandName]);
                                } else {
                                    event.reply(dbot.t('syntax_error'));
                                }
                            }
                        }
                    }
                }.bind(this));
            }.bind(this));
        }.bind(this));
    }.bind(this);
    this.on = 'PRIVMSG';

    this.onLoad = function() {
        // Not sure this is the right place for this. Perhaps they should be in
        // another file?

        cDomain.on('error', function(err) {
            console.log(err); // Hmm
            if(_.has(dbot.modules, 'log')) {
                // can't really get context
                var server = _.keys(dbot.config.servers)[0];
                dbot.api.log.log(server, dbot.config.name, '[\u00034ERR\u000f] ' + err.message);
            }
        });

        dbot.access = {
            'admin': function(event) {
                return dbot.config.admins;
            },

            'moderator': function(event) {
                return [].concat(dbot.access.admin(event), dbot.config.moderators);
            },

            'power_user': function(event) {
                return [].concat(dbot.access.admin(event), dbot.access.moderator(event), dbot.config.power_users);
            },

            'voice': function(event) {
                return [].concat(dbot.access.admin(event), dbot.access.moderator(event), dbot.access.power_user(event),
                    _.chain(event.channel.nicks)
                     .filter(function(nick) {
                         return nick.op == true || nick.voice == true; 
                      })
                      .pluck('name')
                      .value());
            }
        };
    }.bind(this);
};

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