var fs = require('fs'),
    _ = require('underscore')._,
    sys = require('sys'),
    exec = require('child_process').exec;

var commands = function(dbot) {
    var noChangeConfig = [ 'servers', 'name', 'moduleNames' ];
    
    var commands = {
        // Join a channel
        '~join': function(event) {
            var channel = event.params[1];
            if(_.has(event.allChannels, channel)) {
                event.reply(dbot.t('already_in_channel', {'channel': channel}));
            } else {
                dbot.instance.join(event, channel); 
                event.reply(dbot.t('join', {'channel': channel}));
            }
        },

        // Leave a channel
        '~part': function(event) {
            var channel = event.params[1];
            if(!_.has(event.allChannels, channel)) {
                event.reply(dbot.t('not_in_channel', {'channel': channel}));
            } else {
                event.instance.part(event, channel); 
                event.reply(dbot.t('part', {'channel': channel}));
            }
        },

        // Op admin caller in given channel
        '~opme': function(event) {
            var channel = event.params[1];

            // If given channel isn't valid just op in current one.
            if(!_.has(event.allChannels, channel)) {
                channel = event.channel.name;
            }
            dbot.instance.mode(event, channel, ' +o ' + event.user);
        },

        // Do a git pull and reload
        '~greload': function(event) {
            exec("git pull", function (error, stdout, stderr) {
                exec("git submodule update", function (error, stdout, stderr) {
                    event.reply(dbot.t('gpull'));
                    commands['~reload'](event);
                    event.message = '~version';
                    event.action = 'PRIVMSG';                                       
                    event.params = event.message.split(' ');                        
                    dbot.instance.emit(event);  
                }.bind(this));
            }.bind(this));
        },

        // Display commit information for part of dbot
        '~version': function(event){
            var cmd = "git log --pretty=format:'%h (%s): %ar' -n 1 -- ";
            if(event.params[1]){
                var input = event.params[1].trim();
                if(_.has(dbot.modules, input.split("/")[0])){
                    cmd += "modules/"+input;
                }
                else{
                    cmd += input;
                }
            }

            exec(cmd, function(error, stdout, stderr){
                if(stdout.length > 0){
                    event.reply(stdout);
                }
                else{
                    event.reply(dbot.t("no_version"));
                }
            }.bind(this));
        },

        '~status': function(event) {
            var moduleName = event.params[1];
            if(_.has(dbot.status, moduleName)) {
                var status = dbot.status[moduleName];
                if(status === true) {
                    event.reply(dbot.t('status_good', {
                        'module': moduleName, 
                        'reason': status
                    }));
                } else {
                    event.reply(dbot.t('status_bad', { 
                        'module': moduleName, 
                        'reason': status
                    }));
                }
            } else {
                event.reply(dbot.t("status_unloaded"));
            }
        },

        // Reload DB, translations and modules.
        '~reload': function(event) {
            dbot.db = JSON.parse(fs.readFileSync('db.json', 'utf-8'));
            dbot.reloadModules();
            process.nextTick(function() {
                event.reply(dbot.t('reload'));
            });
        },

        // Say something in a channel
        '~say': function(event) {
            var channel = event.params[1];
            if(event.params[1] === "@") {
                channel = event.channel.name;
            }             
            var message = event.params.slice(2).join(' ');
            dbot.say(event.server, channel, message);
        },

        // Load new module 
        '~load': function(event) {
            var moduleName = event.params[1];
            if(!_.include(dbot.config.moduleNames, moduleName)) {
                dbot.customConfig.moduleNames.push(moduleName);
                this.internalAPI.saveConfig();
                dbot.reloadModules();
                process.nextTick(function() {
                    if(dbot.status[moduleName] === true) {
                        event.reply(dbot.t('load_module', { 'moduleName': moduleName }));
                    } else {
                        event.reply(dbot.t('load_failed', { 'module': moduleName }));
                    }
                });
            } else {
                if(moduleName == 'web') {
                    event.reply(dbot.t('already_loaded_web'));
                } else {
                    event.reply(dbot.t('already_loaded', { 'moduleName': moduleName }));
                }
            }
        },

        // Unload a loaded module
        '~unload': function(event) {
            var moduleNames = dbot.config.moduleNames;
            var moduleName = event.params[1];
            if(_.include(moduleNames, moduleName)) {
                var moduleDir = '../' + moduleName + '/';
                try {
                    var cacheKey = require.resolve(moduleDir + moduleName);
                    delete require.cache[cacheKey];
                } catch(err) { }

                dbot.customConfig.moduleNames = _.without(dbot.config.moduleNames, moduleName);
                this.internalAPI.saveConfig();
                dbot.reloadModules();

                process.nextTick(function() {
                    event.reply(dbot.t('unload_module', { 'moduleName': moduleName }));
                });
            } else {
                event.reply(dbot.t('unload_error', { 'moduleName': moduleName }));
            }
        },

        /*** Config options ***/

        '~setconfig': function(event) {
            var configPath = event.input[1],
                newOption = event.input[2];

            if(!_.include(noChangeConfig, configPath)) {
                this.internalAPI.getCurrentConfig(configPath, function(config) {
                    if(config !== null) {
                        // Convert to boolean type if config item boolean
                        if(_.isBoolean(config)) {
                            newOption = (newOption == "true");
                        }

                        // Convert to integer type is config item integer
                        if(_.isNumber(config)) {
                            newOption = parseInt(newOption);
                        }

                        if(_.isArray(config)) {
                            event.reply(dbot.t("config_array", { "alternate": "pushconfig" }));
                        }
                    } else {
                        event.reply(dbot.t('new_config_key', { 'key': configPath }));
                        config = null;
                    }

                    this.internalAPI.setConfig(configPath, newOption, function(err) { 
                        event.reply(configPath + ": " + config + " -> " + newOption);
                    });
                }.bind(this));
            } else {
                event.reply(dbot.t("config_lock"));
            }
        },

        '~pushconfig': function(event) {
            var configPath = event.input[1],
                newOption = event.input[2];

            if(!_.include(noChangeConfig, configPath)) {
                this.internalAPI.getCurrentConfig(configPath, function(config) {
                    if(config !== null) {
                        if(_.isArray(config)) {
                            event.reply(configPath + ": " + config + " << " + newOption);
                            config.push(newOption);
                            this.internalAPI.setConfig(configPath, config, function(err) {});
                        } else {
                            event.reply(dbot.t("config_array", { "alternate": "setconfig" }));
                        }
                    } else {
                        event.reply(dbot.t("no_config_key", { 'path': configPath }));
                    }
                }.bind(this));
            } else {
                event.reply(dbot.t("config_lock"));
            }
        },

        '~showconfig': function(event) {
            var configPath = event.params[1];
            if(configPath) {
                this.internalAPI.getCurrentConfig(configPath, function(config) {
                    if(config !== null) {
                        if(_.isArray(config)) {
                            event.reply(dbot.t("config_keys_location", {
                                "path": configPath,
                                "value": config
                            }));
                        } else if(_.isObject(config)) {
                            event.reply(dbot.t("config_keys_location", {
                                "path": configPath,
                                "value": _.keys(config)
                            }));
                        } else {
                            event.reply(dbot.t("config_keys_location", {
                                "path": configPath,
                                "value": config
                            }));
                        }
                    } else {
                        event.reply(dbot.t("no_config_key", {'path': configPath}));

                        configPath = configPath.split('.');
                        if(_.has(dbot.config.modules, configPath[0])) {
                            configPath.splice(0, 0, 'modules');
                        } else {
                            configPath.pop();
                        }

                        event.params[1] = configPath.join('.');
                        this.commands['~showconfig'](event);
                    }
                }.bind(this));
            } else {
                event.reply(dbot.t("config_keys_location", {
                    "path": "root",
                    "value": _.keys(dbot.config)
                }));
            }
        },

        '~savemodules': function(event) {
            fs.readFile('config.json', 'utf-8', function(err, config) {
                config = JSON.parse(config);
                config.moduleNames = _.keys(dbot.modules);
                fs.writeFile('config.json', JSON.stringify(config, null, '    '), function() {
                    event.reply(dbot.t('modules_saved', { 'modules': _.keys(dbot.modules) }));
                });
            });
        }
    };

    _.each(commands, function(command) {
        command.access = 'admin'; 
    });

    commands['~showconfig'].access = 'moderator';
    commands['~join'].access = 'moderator';
    commands['~part'].access = 'moderator';
    commands['~opme'].access = 'moderator';
    commands['~say'].access = 'moderator';

    commands['~pushconfig'].regex = [/~pushconfig ([^ ]+) ([^ ]+)/, 3];
    commands['~setconfig'].regex = [/~setconfig ([^ ]+) ([^ ]+)/, 3];

    return commands;
};

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