#!/usr/bin/env node
/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
var http = require('http');
var https = require('https');
var util = require("util");
var express = require("express");
var crypto = require("crypto");
try { bcrypt = require('bcrypt'); }
catch(e) { bcrypt = require('bcryptjs'); }
var nopt = require("nopt");
var path = require("path");
var fs = require("fs-extra");
var RED = require("./red/red.js");

var server;
var app = express();

var settingsFile;
var flowFile;

var knownOpts = {
    "help": Boolean,
    "port": Number,
    "settings": [path],
    "title": String,
    "userDir": [path],
    "verbose": Boolean
};
var shortHands = {
    "?":["--help"],
    "p":["--port"],
    "s":["--settings"],
    // As we want to reserve -t for now, adding a shorthand to help so it
    // doesn't get treated as --title
    "t":["--help"],
    "u":["--userDir"],
    "v":["--verbose"]
};
nopt.invalidHandler = function(k,v,t) {
    // TODO: console.log(k,v,t);
}

var parsedArgs = nopt(knownOpts,shortHands,process.argv,2)

if (parsedArgs.help) {
    console.log("Node-RED v"+RED.version());
    console.log("Usage: node-red [-v] [-?] [--settings settings.js] [--userDir DIR]");
    console.log("                [--port PORT] [--title TITLE] [flows.json]");
    console.log("");
    console.log("Options:");
    console.log("  -p, --port     PORT  port to listen on");
    console.log("  -s, --settings FILE  use specified settings file");
    console.log("      --title    TITLE process window title");
    console.log("  -u, --userDir  DIR   use specified user directory");
    console.log("  -v, --verbose        enable verbose output");
    console.log("  -?, --help           show this help");
    console.log("");
    console.log("Documentation can be found at http://nodered.org");
    process.exit();
}

if (parsedArgs.argv.remain.length > 0) {
    flowFile = parsedArgs.argv.remain[0];
}

if (parsedArgs.settings) {
    // User-specified settings file
    settingsFile = parsedArgs.settings;
} else if (parsedArgs.userDir && fs.existsSync(path.join(parsedArgs.userDir,"settings.js"))) {
    // User-specified userDir that contains a settings.js
    settingsFile = path.join(parsedArgs.userDir,"settings.js");
} else {
    if (fs.existsSync(path.join(process.env.NODE_RED_HOME,".config.json"))) {
        // NODE_RED_HOME contains user data - use its settings.js
        settingsFile = path.join(process.env.NODE_RED_HOME,"settings.js");
    } else if (process.env.HOMEPATH && fs.existsSync(path.join(process.env.HOMEPATH,".node-red",".config.json"))) {
        // Consider compatibility for older versions
        settingsFile = path.join(process.env.HOMEPATH,".node-red","settings.js");
    } else {
        var userDir = parsedArgs.userDir || path.join(process.env.HOME || process.env.USERPROFILE || process.env.HOMEPATH,".node-red");
        var userSettingsFile = path.join(userDir,"settings.js");
        if (fs.existsSync(userSettingsFile)) {
            // $HOME/.node-red/settings.js exists
            settingsFile = userSettingsFile;
        } else {
            var defaultSettings = path.join(__dirname,"settings.js");
            var settingsStat = fs.statSync(defaultSettings);
            if (settingsStat.mtime.getTime() <= settingsStat.ctime.getTime()) {
                // Default settings file has not been modified - safe to copy
                fs.copySync(defaultSettings,userSettingsFile);
                settingsFile = userSettingsFile;
            } else {
                // Use default settings.js as it has been modified
                settingsFile = defaultSettings;
            }
        }
    }
}

try {
    var settings = require(settingsFile);
    settings.settingsFile = settingsFile;
} catch(err) {
    console.log("Error loading settings file: "+settingsFile)
    if (err.code == 'MODULE_NOT_FOUND') {
        if (err.toString().indexOf(settingsFile) === -1) {
            console.log(err.toString());
        }
    } else {
        console.log(err);
    }
    process.exit();
}

if (parsedArgs.verbose) {
    settings.verbose = true;
}

if (settings.https) {
    server = https.createServer(settings.https,function(req,res) {app(req,res);});
} else {
    server = http.createServer(function(req,res) {app(req,res);});
}
server.setMaxListeners(0);

function formatRoot(root) {
    if (root[0] != "/") {
        root = "/" + root;
    }
    if (root.slice(-1) != "/") {
        root = root + "/";
    }
    return root;
}

if (settings.httpRoot === false) {
    settings.httpAdminRoot = false;
    settings.httpNodeRoot = false;
} else {
    settings.httpRoot = settings.httpRoot||"/";
    settings.disableEditor = settings.disableEditor||false;
}

if (settings.httpAdminRoot !== false) {
    settings.httpAdminRoot = formatRoot(settings.httpAdminRoot || settings.httpRoot || "/");
    settings.httpAdminAuth = settings.httpAdminAuth || settings.httpAuth;
} else {
    settings.disableEditor = true;
}

if (settings.httpNodeRoot !== false) {
    settings.httpNodeRoot = formatRoot(settings.httpNodeRoot || settings.httpRoot || "/");
    settings.httpNodeAuth = settings.httpNodeAuth || settings.httpAuth;
}

settings.uiPort = parsedArgs.port||settings.uiPort||1880;
settings.uiHost = settings.uiHost||"0.0.0.0";

if (flowFile) {
    settings.flowFile = flowFile;
}
if (parsedArgs.userDir) {
    settings.userDir = parsedArgs.userDir;
}

try {
    RED.init(server,settings);
} catch(err) {
    if (err.code == "unsupported_version") {
        console.log("Unsupported version of node.js:",process.version);
        console.log("Node-RED requires node.js v4 or later");
    } else if  (err.code == "not_built") {
        console.log("Node-RED has not been built. See README.md for details");
    } else {
        console.log("Failed to start server:");
        if (err.stack) {
            console.log(err.stack);
        } else {
            console.log(err);
        }
    }
    process.exit(1);
}

function basicAuthMiddleware(user,pass) {
    var basicAuth = require('basic-auth');
    var checkPassword;
    var localCachedPassword;
    if (pass.length == "32") {
        // Assume its a legacy md5 password
        checkPassword = function(p) {
            return crypto.createHash('md5').update(p,'utf8').digest('hex') === pass;
        }
    } else {
        checkPassword = function(p) {
            return bcrypt.compareSync(p,pass);
        }
    }

    var checkPasswordAndCache = function(p) {
        // For BasicAuth routes we know the password cannot change without
        // a restart of Node-RED. This means we can cache the provided crypted
        // version to save recalculating each time.
        if (localCachedPassword === p) {
            return true;
        }
        var result = checkPassword(p);
        if (result) {
            localCachedPassword = p;
        }
        return result;
    }

    return function(req,res,next) {
        if (req.method === 'OPTIONS') {
            return next();
        }
        var requestUser = basicAuth(req);
        if (!requestUser || requestUser.name !== user || !checkPasswordAndCache(requestUser.pass)) {
            res.set('WWW-Authenticate', 'Basic realm=Authorization Required');
            return res.sendStatus(401);
        }
        next();
    }
}

if (settings.httpAdminRoot !== false && settings.httpAdminAuth) {
    RED.log.warn(RED.log._("server.httpadminauth-deprecated"));
    app.use(settings.httpAdminRoot, basicAuthMiddleware(settings.httpAdminAuth.user,settings.httpAdminAuth.pass));
}

if (settings.httpAdminRoot !== false) {
    app.use(settings.httpAdminRoot,RED.httpAdmin);
}
if (settings.httpNodeRoot !== false && settings.httpNodeAuth) {
    app.use(settings.httpNodeRoot,basicAuthMiddleware(settings.httpNodeAuth.user,settings.httpNodeAuth.pass));
}
if (settings.httpNodeRoot !== false) {
    app.use(settings.httpNodeRoot,RED.httpNode);
}
if (settings.httpStatic) {
    settings.httpStaticAuth = settings.httpStaticAuth || settings.httpAuth;
    if (settings.httpStaticAuth) {
        app.use("/",basicAuthMiddleware(settings.httpStaticAuth.user,settings.httpStaticAuth.pass));
    }
    app.use("/",express.static(settings.httpStatic));
}

function getListenPath() {
    var listenPath = 'http'+(settings.https?'s':'')+'://'+
                    (settings.uiHost == '0.0.0.0'?'127.0.0.1':settings.uiHost)+
                    ':'+settings.uiPort;
    if (settings.httpAdminRoot !== false) {
        listenPath += settings.httpAdminRoot;
    } else if (settings.httpStatic) {
        listenPath += "/";
    }
    return listenPath;
}

RED.start().then(function() {
    if (settings.httpAdminRoot !== false || settings.httpNodeRoot !== false || settings.httpStatic) {
        server.on('error', function(err) {
            if (err.errno === "EADDRINUSE") {
                RED.log.error(RED.log._("server.unable-to-listen", {listenpath:getListenPath()}));
                RED.log.error(RED.log._("server.port-in-use"));
            } else {
                RED.log.error(RED.log._("server.uncaught-exception"));
                if (err.stack) {
                    RED.log.error(err.stack);
                } else {
                    RED.log.error(err);
                }
            }
            process.exit(1);
        });
        server.listen(settings.uiPort,settings.uiHost,function() {
            if (settings.httpAdminRoot === false) {
                RED.log.info(RED.log._("server.admin-ui-disabled"));
            }
            process.title = parsedArgs.title || 'node-red';
            RED.log.info(RED.log._("server.now-running", {listenpath:getListenPath()}));
        });
    } else {
        RED.log.info(RED.log._("server.headless-mode"));
    }
}).otherwise(function(err) {
    RED.log.error(RED.log._("server.failed-to-start"));
    if (err.stack) {
        RED.log.error(err.stack);
    } else {
        RED.log.error(err);
    }
});

process.on('uncaughtException',function(err) {
    util.log('[red] Uncaught Exception:');
    if (err.stack) {
        util.log(err.stack);
    } else {
        util.log(err);
    }
    process.exit(1);
});

process.on('SIGINT', function () {
    RED.stop();
    // TODO: need to allow nodes to close asynchronously before terminating the
    // process - ie, promises
    process.exit();
});