const createError = require('http-errors'),
      express = require('express'),
      path = require('path'),
      cookieParser = require('cookie-parser'),
      logger = require('morgan'),
      compileSass = require('express-compile-sass'),
      session = require('express-session'),
      pg = require('pg'),
      pgSession = require('connect-pg-simple')(session),
      fsx = require('fs-extra'),
      yaml = require('js-yaml'),
      graphqlHTTP = require('express-graphql'),
      { buildSchema } = require('graphql'),
      { importSchema } = require('graphql-import'),

  indexRouter = require('./routes/index'),
  usersRouter = require('./routes/users'),
  riddleRouter = require('./routes/riddle'),
  bingoRouter = require('./routes/bingo');

let settings = yaml.safeLoad(fsx.readFileSync('default-config.yaml'));

if (fsx.existsSync('config.yaml'))
  Object.assign(settings, yaml.safeLoad(fsx.readFileSync('config.yaml')));

async function init() {
  // grapql default resolver
  let graphqlResolver = (request, response) => {
    return {
      time: Date.now(),
      bingo:  bingoRouter.graphqlResolver(request, response)
    }
  };
  // database setup
  let pgPool = new pg.Pool({
    host: settings.postgres.host,
    port: settings.postgres.port,
    user: settings.postgres.user,
    password: settings.postgres.password,
    database: settings.postgres.database
  });
  await pgPool.query(fsx.readFileSync('./sql/createSessionTable.sql', 'utf-8'));

  let app = express();

  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'pug');
  app.set('trust proxy', 1);

  app.use(logger('dev'));
  app.use(express.json());
  app.use(express.urlencoded({ extended: false }));
  app.use(cookieParser());
  app.use(session({
    store: new pgSession({
      pool: pgPool,
      tableName: 'user_sessions'
    }),
    secret: settings.sessions.secret,
    resave: false,
    saveUninitialized: true,
    cookie: {
      maxAge: 30 * 24 * 60 * 60 * 1000  // maxAge 30 days
    }
  }));
  app.use('/sass', compileSass({
    root: './public/stylesheets/sass',
    sourceMap: true,
    watchFiles: true,
    logToConsole: true
  }));
  app.use(express.static(path.join(__dirname, 'public')));

  app.use('/', indexRouter);
  app.use('/users', usersRouter);
  app.use(/\/riddle(\/.*)?/, riddleRouter);
  app.use('/bingo', bingoRouter);
  app.use('/graphql', graphqlHTTP((request, response) => {
    return {
      schema: buildSchema(importSchema('./graphql/schema.graphql')),
      rootValue: graphqlResolver(request, response),
      context: {session: request.session},
      graphiql: true
    };
  }));

// catch 404 and forward to error handler
  app.use(function(req, res, next) {
    next(createError(404));
  });

// error handler
  app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
  });
  return app;
}

module.exports = init;

//app.listen(settings.port);