// Manage test servers
//
// YYY Would be nice to be able to hide server output.
//

// Provide servers
//
// Servers are created in tmp/server/$server
//

var config = require("./config.js");
var utils = require("../js/utils.js");

var fs = require("fs");
var path = require("path");
var util = require("util");
var child = require("child_process");

var servers = {};

// Create a server object
var Server = function(name) {
	this.name = name;
};

// Return a server's newcoind.cfg as string.
Server.method('configContent', function() {
	var	cfg	= config.servers[this.name];

	return Object.keys(cfg).map(function(o) {
		return util.format("[%s]\n%s\n", o, cfg[o]);
		}).join("");
});

Server.method('serverPath', function() {
    return "tmp/server/" + this.name;
});

Server.method('configPath', function() {
	return path.join(this.serverPath(), "newcoind.cfg");
});

// Write a server's newcoind.cfg.
Server.method('writeConfig', function(done) {
	fs.writeFile(this.configPath(), this.configContent(), 'utf8', done);
});

// Spawn the server.
Server.method('serverSpawnSync', function() {
	// Spawn in standalone mode for now.
	this.child = child.spawn(
		config.newcoind,
		[
			"-a",
			"-v",
			"--conf=newcoind.cfg"
		],
		{
			cwd: this.serverPath(),
			env: process.env,
			stdio: 'inherit'
		});

	console.log("server: start %s: %s -a --conf=%s", this.child.pid, config.newcoind, this.configPath());

	// By default, just log exits.
	this.child.on('exit', function(code, signal) {
		// If could not exec: code=127, signal=null
		// If regular exit: code=0, signal=null
		console.log("server: spawn: server exited code=%s: signal=%s", code, signal);
		});

});

// Prepare server's working directory.
Server.method('makeBase', function(done) {
    var	path	= this.serverPath();
	var self	= this;

    // Reset the server directory, build it if needed.
    utils.resetPath(path, '0777', function(e) {
			if (e) {
				throw e;
			}
			else {
				self.writeConfig(done);
			}
		});
});

// Create a standalone server.
// Prepare the working directory and spawn the server.
Server.method('start', function(done) {
	var self	= this;

    this.makeBase(function(e) {
			if (e) {
				throw e;
			}
			else {
				self.serverSpawnSync();
				done();
			}
		});
});

// Stop a standalone server.
Server.method('stop', function(done) {
	if (this.child) {
		// Update the on exit to invoke done.
		this.child.on('exit', function(code, signal) {
			console.log("server: stop: server exited");
			done();
			});
		this.child.kill();
	}
	else
	{
		console.log("server: stop: no such server");
		done();	
	}
});

// Start the named server.
exports.start = function(name, done) {
	if (servers[name])
	{
		console.log("server: start: server already started.");
	}
	else
	{
		var	server = new Server(name);

		servers[name] = server;

		console.log("server: start: %s", JSON.stringify(server));

		server.start(done);
	}
};

// Delete the named server.
exports.stop = function(name, done) {
	console.log("server: stop: %s of %s", name, Object.keys(servers).toString());

	var server	= servers[name];
	if (server) {
		server.stop(done);
		delete servers[name];
	}
};

exports.Server = Server;

// vim:ts=4