// 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 nodeutils = require("../js/nodeutils.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 rippled.cfg as string.
Server.prototype.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.prototype.serverPath = function() {
  return "tmp/server/" + this.name;
};

Server.prototype.configPath = function() {
  return path.join(this.serverPath(), "rippled.cfg");
};

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

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

  console.log("server: start %s: %s -a --conf=%s", this.child.pid, config.rippled, 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.prototype.makeBase = function (done) {
  var path  = this.serverPath();
  var self  = this;

  // Reset the server directory, build it if needed.
  nodeutils.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.prototype.start = function (done) {
  var self	= this;

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

// Stop a standalone server.
Server.prototype.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('noSuchServer');	
  }
};

// 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:sw=2:sts=2:ts=8