let async = require('async');
const constants = require('./constants');
const _ = require('underscore');
const StorageProcessesLauncher = require('./processes/storageProcesses/storageProcessesLauncher');
// require("./utils/debug_util.js")(__filename, async);

require('colors');

// Override process.chdir so that we have a partial-implementation PWD for Windows
const realChdir = process.chdir;
process.chdir = (...args) => {
    if (!process.env.PWD) {
        process.env.PWD = process.cwd();
    }
    realChdir(...args);
};

let Engine = require('./core/engine.js');

let version = require('../package.json').version;

class Embark {

  constructor (options) {
    this.version = version;
    this.options = options || {};
  }

  initConfig(env, options) {
    let Events = require('./core/events.js');
    let Logger = require('./core/logger.js');
    let Config = require('./core/config.js');

    this.events = new Events();
    this.logger = new Logger({logLevel: 'debug', events: this.events});

    this.config = new Config({env: env, logger: this.logger, events: this.events, context: this.context});
    this.config.loadConfigFiles(options);
    this.plugins = this.config.plugins;
  }

  isDev(env) {
    if (this.config && this.config.blockchainConfig && this.config.blockchainConfig.isDev) {
      return true;
    } else if (this.config && this.config.blockchainConfig && this.config.blockchainConfig.isDev === false) {
      return false;
    }
    return (env === 'development');
  }

  blockchain(env, client) {
    this.context = [constants.contexts.blockchain];
    return require('./cmds/blockchain/blockchain.js')(this.config.blockchainConfig, client, env, this.isDev(env)).run();
  }

  simulator(options) {
    this.context = options.context || [constants.contexts.simulator, constants.contexts.blockchain];
    let Simulator = require('./cmds/simulator.js');
    let simulator = new Simulator({blockchainConfig: this.config.blockchainConfig, logger: this.logger});
    simulator.run(options);
  }

  generateTemplate(templateName, destinationFolder, name) {
    this.context = [constants.contexts.templateGeneration];
    let TemplateGenerator = require('./cmds/template_generator.js');
    let templateGenerator = new TemplateGenerator(templateName);
    templateGenerator.generate(destinationFolder, name);
  }

  _checkStorageEndpoint(engine, platform, callback) {
    let checkFn;
    _.find(engine.servicesMonitor.checkList, (value, key) => {
      if(key.toLowerCase() === platform.toLowerCase()){
        checkFn = value;
        return true;
      }
    });
    if (!checkFn || typeof checkFn.fn !== 'function') {
      return callback();
    }

    checkFn.fn(function (serviceCheckResult) {
      if (!serviceCheckResult.status || serviceCheckResult.status === 'off') {
        return callback('No node');
      }
      callback();
    });
  }

  _startStorageNode(engine, platform, callback) {
    const storageProcessesLauncher = new StorageProcessesLauncher({
      logger: engine.logger,
      events: engine.events,
      storageConfig: engine.config.storageConfig,
      webServerConfig: engine.config.webServerConfig
    });
    return storageProcessesLauncher.launchProcess(platform.toLowerCase(), (err) => {
      if (err) {
        engine.logger.error(err);
        return callback(err);
      }
      callback();
    });
  }

  run(options) {
    let self = this;
    self.context = options.context || [constants.contexts.run, constants.contexts.build];
    let Dashboard = require('./dashboard/dashboard.js');
    let windowSize = require('window-size');

    let engine = new Engine({
      env: options.env,
      client: options.client,
      locale: options.locale,
      isDev: this.isDev(options.env),
      version: this.version,
      embarkConfig: options.embarkConfig || 'embark.json',
      logFile: options.logFile,
      logLevel: options.logLevel,
      context: self.context
    });
    engine.init();

    if (!options.useDashboard) {
      engine.logger.info('========================'.bold.green);
      engine.logger.info((__('Welcome to Embark') + ' ' + this.version).yellow.bold);
      engine.logger.info('========================'.bold.green);
    }

    async.parallel([
      function startDashboard(callback) {
        if (!options.useDashboard) {
          return callback();
        }

        let dashboard = new Dashboard({
          events: engine.events,
          logger: engine.logger,
          plugins: engine.plugins,
          version: self.version,
          env: engine.env,
          contractsConfig: engine.config.contractsConfig
        });
        dashboard.start(function () {
          engine.logger.info(__('dashboard start'));
          callback();
        });
      },
      function (callback) {
        let pluginList = engine.plugins.listPlugins();
        if (pluginList.length > 0) {
          engine.logger.info(__("loaded plugins") + ": " + pluginList.join(", "));
        }

        engine.startMonitor();
        engine.startService("libraryManager");
        engine.startService("codeRunner");
        engine.startService("web3");
        engine.startService("pipeline");
        engine.startService("deployment");
        engine.startService('storage');
        engine.startService("codeGenerator");
        engine.startService("namingSystem");
        engine.events.on('check:backOnline:Ethereum', function () {
          engine.logger.info(__('Ethereum node detected') + '..');
          engine.config.reloadConfig();
          engine.events.request('deploy:contracts', function() {
            engine.logger.info(__('Deployment Done'));
          });
        });

        // Check storage
        const platform = engine.config.storageConfig.provider;
        self._checkStorageEndpoint(engine, platform, (err) => {
          if (!err) {
            return;
          }
          self._startStorageNode(engine, platform, (err) => {
            if (err) {
              engine.logger.error('Error while starting a storage process for ' + platform);
              engine.logger.error(err);
            }
          });
        });

        engine.events.on('outputDone', function () {
          engine.logger.info((__("Looking for documentation? You can find it at") + " ").cyan + "http://embark.status.im/docs/".green.underline + ".".cyan);
          engine.logger.info(__("Ready").underline);
          engine.events.emit("status", __("Ready").green);
        });

        if (options.runWebserver) {
          engine.startService("webServer", {
            host: options.serverHost,
            port: options.serverPort
          });
        }
        engine.startService("fileWatcher");
        callback();
      }
    ], function (err, _result) {
      if (err) {
        engine.logger.error(err.message);
        engine.logger.info(err.stack);
      } else {
        engine.events.emit('firstDeploymentDone');

        let size = windowSize.get();
        if (size.height < 40 || size.width < 118) {
          engine.logger.warn(__("tip: you can resize the terminal or disable the dashboard with") + " embark run --nodashboard".bold.underline);
        }
      }
    });
  }

  build(options) {
    this.context = options.context || [constants.contexts.build];

    let engine = new Engine({
      env: options.env,
      client: options.client,
      locale: options.locale,
      isDev: this.isDev(options.env),
      version: this.version,
      embarkConfig: 'embark.json',
      interceptLogs: false,
      logFile: options.logFile,
      logLevel: options.logLevel,
      events: options.events,
      logger: options.logger,
      config: options.config,
      plugins: options.plugins,
      context: this.context
    });
    engine.init();

    async.waterfall([
      function startServices(callback) {
        let pluginList = engine.plugins.listPlugins();
        if (pluginList.length > 0) {
          engine.logger.info(__("loaded plugins") + ": " + pluginList.join(", "));
        }

        engine.startService("libraryManager");
        engine.startService("codeRunner");
        engine.startService("web3");
        engine.startService("pipeline");
        engine.startService("deployment", {onlyCompile: options.onlyCompile});
        engine.startService("storage");
        engine.startService("codeGenerator");
        callback();
      },
      function deploy(callback) {
        engine.events.request('deploy:contracts', function(err) {
          callback(err);
        });
      }
    ], function (err, _result) {
      if (err) {
        engine.logger.error(err.message);
        engine.logger.debug(err.stack);
      } else {
        engine.logger.info(__("finished building").underline);
      }
      // needed due to child processes
      process.exit();
    });
  }

  initTests(options) {
    this.context = options.context || [constants.contexts.test];
    let Test = require('./tests/test.js');
    options.context = this.context;
    return new Test(options);
  }

  graph(options) {
    this.context = options.context || [constants.contexts.graph];
    options.onlyCompile = true;
    
    let engine = new Engine({
      env: options.env,
      isDev: this.isDev(options.env),
      version: this.version,
      embarkConfig: options.embarkConfig || 'embark.json',
      logFile: options.logFile,
      context: this.context
    });
    engine.init();

    async.parallel([

      function (callback) {
        let pluginList = engine.plugins.listPlugins();
        if (pluginList.length > 0) {
          engine.logger.info(__("loaded plugins") + ": " + pluginList.join(", "));
        }

        engine.startMonitor();
        engine.startService("libraryManager");
        engine.startService("pipeline");
        engine.startService("deployment", {onlyCompile: true});
        
        engine.startService("codeGenerator");

        engine.events.request('deploy:contracts', function(err) {
          callback(err);
        });
      }
    ],  (err, _result) => {
      if (err) {
        engine.logger.error(err.message);
        engine.logger.info(err.stack);
      } else {

        const GraphGenerator = require('./cmds/graph.js');
        let graphGen = new GraphGenerator(engine);
        graphGen.generate(options);

        engine.logger.info(__("Done. %s generated", "./diagram.svg").underline);
      }
      process.exit();
    });

  }

  reset() {
    this.context = [constants.contexts.reset];
    let resetCmd = require('./cmds/reset.js');
    resetCmd();
  }

  upload(options) {
    const self = this;
    this.context = options.context || [constants.contexts.upload, constants.contexts.build];

    let engine = new Engine({
      env: options.env,
      client: options.client,
      locale: options.locale,
      isDev: this.isDev(options.env),
      version: this.version,
      embarkConfig: 'embark.json',
      interceptLogs: false,
      logFile: options.logFile,
      logLevel: options.logLevel,
      events: options.events,
      logger: options.logger,
      config: options.config,
      plugins: options.plugins
    });
    engine.init();

    let platform = engine.config.storageConfig.upload.provider;

    let cmdPlugin;
    async.waterfall([

      function startServices(callback) {

        engine.startService("libraryManager");
        engine.startService("codeRunner");
        engine.startService("web3");
        engine.startService("pipeline");
        engine.startService("deployment");
        engine.startService('storage');
        engine.startService("codeGenerator");
        engine.startMonitor();
        callback();
      },
      function checkStorageService(callback){

        const errorObj = {message: __('Cannot upload: {{platform}} node is not running on {{protocol}}://{{host}}:{{port}}.', {platform: platform, protocol: engine.config.storageConfig.protocol, host: engine.config.storageConfig.host, port: engine.config.storageConfig.port})};

        self._checkStorageEndpoint(engine, platform, function (err) {
          if (!err) {
            return callback();
          }
          self._startStorageNode(engine, platform, (err) => {
            if (err) {
              engine.logger.error(err);
              return callback(errorObj);
            }
            // Check endpoint again to see if really did start
            self._checkStorageEndpoint(engine, platform, (err) => {
              if (err) {
                return callback(errorObj);
              }
              callback();
            });
          });
        });
        if (!checkFn || typeof checkFn.fn !== 'function') {
          return callback();
        }
        checkFn.fn(function (serviceCheckResult) {
          if (!serviceCheckResult.status || serviceCheckResult.status === 'off') {
            let config = engine.config.storageConfig.upload;
            return callback({message: __('Cannot upload: {{platform}} node is not running on {{protocol}}://{{host}}:{{port}}.', {platform: platform, protocol: config.protocol, host: config.host, port: config.port})});
          }
          callback();
        });
      },
      function setupStoragePlugin(callback){
        let pluginList = engine.plugins.listPlugins();
        if (pluginList.length > 0) {
          engine.logger.info(__("loaded plugins") + ": " + pluginList.join(", "));
        }

        // check use has input existing storage plugin
        let cmdPlugins = engine.plugins.getPluginsFor('uploadCmds');

        if (cmdPlugins.length > 0) {
          cmdPlugin = cmdPlugins.find((pluginCmd) => {
            return pluginCmd.uploadCmds.some(uploadCmd => {
              return uploadCmd.cmd === platform;
            });
          });
        }
        if (!cmdPlugin) {
          return callback({message: __('platform "{{platform}}" is specified as the upload provider, however no plugins have registered an upload command for "{{platform}}".', {platform: platform})});
        }
        callback();
      },
      function deploy(callback) {
        engine.events.on('outputDone', function () {
          cmdPlugin.uploadCmds[0].cb()
          .then((success) => {
            callback(null, success);
          })
          .catch(callback);
        });

        engine.events.request('deploy:contracts', function(err) {
          engine.logger.info(__("finished deploying").underline);
          if(err){
            callback(err);
          }
        });
      }
    ], function (err, _result) {
      if (err) {
        engine.logger.error(err.message);
        engine.logger.debug(err.stack);
      } else {
        engine.logger.info((__("finished building DApp and deploying to") + " " + platform).underline);
      }

      // needed due to child processes
      process.exit();
    });
  }

  runTests(file) {
    this.context = [constants.contexts.test];
    let RunTests = require('./tests/run_tests.js');
    RunTests.run(file);
  }

}

// temporary until next refactor
Embark.initTests = function(options) {
  let Test = require('./tests/test.js');
  options.context = [constants.contexts.test];
  return new Test(options);
};

module.exports = Embark;