var http = require('http')
var url = require('url')
var fs = require('fs')

var express = require('express')
var validator = require('express-validator')
var cookieSession = require('cookie-session')
var bodyParser = require('body-parser')
var serveFavicon = require('serve-favicon')
var serveStatic = require('serve-static')
var csrf = require('csurf')
var Promise = require('bluebird')
var compression = require('compression')

var logger = require('../../util/logger')
var pathutil = require('../../util/pathutil')
var dbapi = require('../../db/api')
var datautil = require('../../util/datautil')
var config = require('../../../config');

var auth = require('./middleware/auth')
var deviceIconMiddleware = require('./middleware/device-icons')
var browserIconMiddleware = require('./middleware/browser-icons')
var appstoreIconMiddleware = require('./middleware/appstore-icons')

var markdownServe = require('markdown-serve')

module.exports = function(options) {
  var log = logger.createLogger('app')
  var app = express()
  var server = http.createServer(app)

  app.use('/static/wiki', markdownServe.middleware({
    rootDirectory: pathutil.root('node_modules/stf-wiki')
  , view: 'docs'
  }))

  app.set('view engine', 'jade')
  app.set('views', pathutil.resource('app/views'))
  app.set('strict routing', true)
  app.set('case sensitive routing', true)
  app.set('trust proxy', true)

  if (fs.existsSync(pathutil.resource('build'))) {
    log.info('Using pre-built resources')
    app.use(compression())
    app.use('/static/app/build/entry',
      serveStatic(pathutil.resource('build/entry')))
    app.use('/static/app/build', serveStatic(pathutil.resource('build'), {
      maxAge: '10d'
    }))
  }
  else {
    log.info('Using webpack')
    // Keep webpack-related requires here, as our prebuilt package won't
    // have them at all.
    var webpackServerConfig = require('./../../../webpack.config').webpackServer
    app.use('/static/app/build',
      require('./middleware/webpack')(webpackServerConfig))
  }

  app.use('/static/bower_components',
    serveStatic(pathutil.resource('bower_components')))
  app.use('/static/app/data', serveStatic(pathutil.resource('data')))
  app.use('/static/app/status', serveStatic(pathutil.resource('common/status')))
  app.use('/static/app/browsers', browserIconMiddleware())
  app.use('/static/app/appstores', appstoreIconMiddleware())
  app.use('/static/app/devices', deviceIconMiddleware())
  app.use('/static/app', serveStatic(pathutil.resource('app')))

  app.use('/static/logo',
    serveStatic(pathutil.resource('common/logo')))
  app.use(serveFavicon(pathutil.resource(
    'common/logo/exports/STF-128.png')))

  app.use(cookieSession({
    name: options.ssid
  , keys: [options.secret]
  }))

  app.get('/task-end', function(req, res) {
    res.render('taskend', {contactEmail: config.hitAccounts.contactEmail});
  });

  app.use(auth({
    secret: options.secret
  , authUrl: options.authUrl
  }))

  // This needs to be before the csrf() middleware or we'll get nasty
  // errors in the logs. The dummy endpoint is a hack used to enable
  // autocomplete on some text fields.
  app.all('/app/api/v1/dummy', function(req, res) {
    res.send('OK')
  })

  var expireToken = function(token, res) {
    dbapi.expireToken(token).then(function() {
      res.sendStatus(200);
    }).catch(function(err) {
      log.error('Error expiring token: ', err.stack);
      res.sendStatus(500);
    });
  };

  app.delete('/app/api/v1/token/:token', function(req, res) {
    var token = req.params.token;

    expireToken(token, res);
  });

  app.delete('/app/api/v1/token', function(req, res) {
    var serial = req.query.serial;

    dbapi.getDeviceBySerial(serial).then(function(device) {
      if (device && device.owner && device.owner.email) {
        expireToken(device.owner.email, res);
      } else {
        res.status(404);
        res.send('No owner found for serial: ' + serial);
      }
    }).catch(function(err) {
      log.error('Failed to get device by serial: ', err.stack);
      res.sendStatus(500);
    });
  });

  app.use(bodyParser.json())
  app.use(csrf())
  app.use(validator())

  app.use(function(req, res, next) {
    res.cookie('XSRF-TOKEN', req.csrfToken())
    next()
  })

  app.get('/', function(req, res) {
    res.render('index', {stfConfig: JSON.stringify(config || {})});
  })

  app.get('/app/api/v1/state.js', function(req, res) {
    var state = {
      config: {
        websocketUrl: (function() {
          var wsUrl = url.parse(options.websocketUrl, true)
          wsUrl.query.uip = req.ip
          return url.format(wsUrl)
        })()
      }
    , user: req.user
    }

    if (options.userProfileUrl) {
      state.config.userProfileUrl = (function() {
        return options.userProfileUrl
      })()
    }

    res.type('application/javascript')
    res.send('var GLOBAL_APPSTATE = ' + JSON.stringify(state))
  })

  app.get('/app/api/v1/user', function(req, res) {
    res.json({
      success: true
    , user: req.user
    })
  })

  app.get('/app/api/v1/group', function(req, res) {
    dbapi.loadGroup(req.user.email)
      .then(function(cursor) {
        return Promise.promisify(cursor.toArray, cursor)()
          .then(function(list) {
            list.forEach(function(device) {
              datautil.normalize(device, req.user)
            })
            res.json({
              success: true
            , devices: list
            })
          })
      })
      .catch(function(err) {
        log.error('Failed to load group: ', err.stack)
        res.json(500, {
          success: false
        })
      })
  })

  app.get('/app/api/v1/devices', function(req, res) {
    dbapi.loadDevices()
      .then(function(cursor) {
        return Promise.promisify(cursor.toArray, cursor)()
          .then(function(list) {
            list.forEach(function(device) {
              datautil.normalize(device, req.user)
            })

            res.json({
              success: true
            , devices: list
            })
          })
      })
      .catch(function(err) {
        log.error('Failed to load device list: ', err.stack)
        res.json(500, {
          success: false
        })
      })
  })

  app.get('/app/api/v1/devices/:serial', function(req, res) {
    dbapi.loadDevice(req.params.serial)
      .then(function(device) {
        if (device) {
          datautil.normalize(device, req.user)
          res.json({
            success: true
          , device: device
          })
        }
        else {
          res.json(404, {
            success: false
          })
        }
      })
      .catch(function(err) {
        log.error('Failed to load device "%s": ', req.params.serial, err.stack)
        res.json(500, {
          success: false
        })
      })
  })

  app.get('/app/api/v1/accessTokens', function(req, res) {
    dbapi.loadAccessTokens(req.user.email)
      .then(function(cursor) {
        return Promise.promisify(cursor.toArray, cursor)()
          .then(function(list) {
            var titles = []
            list.forEach(function(token) {
              titles.push(token.title)
            })
            res.json({
              success: true
            , titles: titles
            })
          })
      })
      .catch(function(err) {
        log.error('Failed to load tokens: ', err.stack)
        res.json(500, {
          success: false
        })
      })
  })

  // Tilde pattern is REST shorthand for "my", e.g. get my token.
  app.get('/app/api/v1/token/~', function(req, res) {
    if (!req.user || !req.user.email) {
      res.status(404);
      return res.send('Missing user email in request.');
    }

    dbapi.getToken(req.user.email).then(function(tokenObj) {
      if (tokenObj) {
        res.json(tokenObj);
      } else {
        res.status(404);
        res.send('Token not found for email: ' + req.user.email);
      }
    }).catch(function(err) {
      log.error('Failed to get token: ', err.stack);
      res.sendStatus(500);
    });
  });

  server.listen(options.port)
  log.info('Listening on port %d', options.port)
}