// @ts-check

/* eslint-disable no-cond-assign */
/** This is a sample code of a server that works like a messenger where you can exhange messages with your contacts. */
const { createServer, modelFactory, is, or, member, count, none, all, not, and, now, plugins: { loginPlugin, securityPlugin, stripePlugin } } = require('./src')
const express = require('express')

/*************************************************************************
 *************************** TABLES DECLARATION **************************/

// Generate the tables. Doing it this way make us able to use self-references and cross references between tables
/** @type {import('./').Tables} **/
const tables = {}
const { User, Feed, Comment } = modelFactory(tables)

// First, just focus on the structure of your data. Describe your table architecture
Object.assign(User, {
  pseudo: 'string/25',
  email: 'string/40',
  password: 'binary/64',
  salt: 'binary/16',
  stripeId: 'string/40',
  contacts: [User],
  invited: [User],
  notNull: ['pseudo', 'email', 'password', 'salt'],
  index: [
    // You can use the object form
    {
      column: 'email',
      type: 'unique'
    },
    // Or the short string form
    'pseudo/8',
    'contacts/unique',
    'invited/unique',
    // You can create an index between multiple columns
    {
      column: ['email', 'pseudo'],
      length: [8, 8],
      type: 'unique'
    }
  ]
})

Object.assign(Comment, {
  content: 'text',
  title: 'string/60',
  author: User,
  date: {
    type: 'dateTime',
    defaultValue: now
  },
  lastModification: {
    type: 'dateTime',
    defaultValue: now
  },
  notNull: ['title', 'author'],
  index: ['date', 'content/fulltext']
})

Object.assign(Feed, {
  participants: [User],
  comments: [Comment],
  index: ['participants/unique', 'comments/unique']
})

/*************************************************************************
 ************************* DATABASE CONFIGURATION ************************/

// Provide every configuration detail about your database:
/** @type {import('./').Database} */
const database = {
  user: 'root', // the login to access your database
  password: 'password', // the password to access your database
  type: 'mysql', // the database type that you wish to be using
  privateKey: 'key', // a private key that will be used to identify requests that can ignore access rules
  host: 'localhost', // the database server host
  database: 'simpleql', // the name of your database
  create: true, // we require to create the database
  insecureAuth: true
}

/*************************************************************************
 ************************** ACCESS CONTROL RULES *************************/

const rules = {
  User: {
    email: {
      write: none // emails cannot be changed
    },
    password: {
      read: none // no one can read the password
    },
    salt: {
      read: none // no one can read the salt
    },
    contacts: {
      add: is('self') // Only ourself can add contacts
    },
    invited: {
      add: and(
        is('self'), // Only ourself can invite contacts
        not(member('invited')) // Cannot invite oneself as our own contact
      )
    },
    stripeId: {
      write: none,
      read: is('self')
    },
    create: all, // Creation is handled by login middleware. No one should create Users from request.
    delete: is('self'), // Users can only delete their own profile
    write: is('self'), // Users can only edit their own profile
    read: or(is('self'), member('contacts'), member('invited')) // Users and their contacts can read the profile data
  },
  Feed: {
    comments: {
      add: member('participants'), // You need to be a member of the participants of the feed to create messages into the feed
      remove: none // To remove a comment, you need to delete it from the database
    },
    participants: {
      add: none, // Once the feed is created, no one can add participants
      remove: none // Once the feed is created, no one can remove participants
    },
    delete: none, // No one can delete a feed
    create: and(
      member('participants'), // Users always need to be a member of the feed they wish to create
      count('participants', { amount: 2 }) // When creating a Feed, the amount of participants must equal 2
    ),
    read: member('participants'), // Only the members of a feed can read its content
    write: none // No one can edit a feed once created
  },
  Comment: {
    date: {
      write: none // The creation date of a message cannot be changed
    },
    author: {
      write: none // The author of a message cannot be changed
    },
    delete: is('author'), // Only the author of a message can delete it
    create: is('author'), // To create a message, you need to declare yourself as the author
    write: is('author'), // Only the author can edit their messages
    read: customRule // Only the feed's participants can read the message content
  }
}

// You can always create your own rules. The parameters are described in the documentation.
/** Ensure that only the feed's participants can read the message content */
function customRule () {
  return ({ query, object, authId, request }) => {
    // In case of message creation, the feed might not exist yet but we don't mind reading the data anyway
    if (request.create) return Promise.resolve()
    // We want to make sure that only participants of a feed can read the messages from that feed.
    return query({
      // We look for feeds containing that comment, and the author as participant
      Feed: {
        comments: {
          reservedId: object.reservedId,
          required: true // We need this to indicate that we don't care about Feeds that have no Comments
        },
        participants: {
          reservedId: authId,
          required: true // We need this to indicate that we don't care about Feeds that have no Participants
        }
      }
    },
    // We give admin rights to this request to be able to read the data from the database, but we set readOnly mode to be safer.
    { admin: true, readOnly: true }).then(results => {
      // If we found no Feed matching the request, we reject the access to the message content.
      return results.Feed.length > 0 ? Promise.resolve() : Promise.reject({ status: 401, message: 'Only feed participants can read message content' })
    })
  }
}

/*************************************************************************
 ****************************** CUSTOM PLUGINS ***************************/

// You can always create your own plugin if some fields requier extra attention. See the documentation for more details.
/**
 * @type {import('./').Plugin}
 * This plugin will handle a complex set of business rule:
 * 1. Before being able to add a contact, this contact must have invited you or have you as a contact
 * 2. You cannot invite as a contact one of your contacts
 * 3. You cannot invite as a contact someone you already invited
 * 4. If you try to invite someone that invited you already, you will both be added as contacts of eachother and removed from your respective invited list
 * 5. If you try to add someone as a contact that is already in your invited list, we will remove it from your invited list
 *
 * You will see that this complex list of constraints can be handled quite easily with SimpleQL plugins.
 */
const customPlugin = {
  // This part will edit the request before querying the database
  onProcessing: {
    User: async (results, { request, query, local, isAdmin }) => {
      if (isAdmin) return Promise.resolve()// We don't control admin requests
      // When we invite a contact, we want to make sure that some rules are respected
      if ((request.invited && request.invited.add) || (request.contacts && request.contacts.add)) {
        // This is the list of contacts being added
        const invited = ((!request.invited || !request.invited.add) ? [] : Array.isArray(request.invited.add) ? request.invited.add : [request.invited.add])
        const contacts = ((!request.contacts || !request.contacts.add) ? [] : Array.isArray(request.contacts.add) ? request.contacts.add : [request.contacts.add])

        // We need the user's contacts and invited list
        const { User: [user] } = await query({ User: { reservedId: results.map(u => u.reservedId), get: ['invited', 'contacts'] } }, { admin: true, readOnly: true })
        if (!user) return Promise.reject({ status: 404, message: `No user was found with email ${request.email}` })
        const userId = user.reservedId

        // We get the contacts data of the contacts being invited. We take good care to only read the data as we will need access root!
        const { User: addInvited } = !invited.length ? { User: [] } : await query({ User: invited.map(i => ({ ...i, get: ['contacts', 'invited'] })) }, { admin: true, readOnly: true })
        // We get the contacts data of the contacts being added. We take good care to only read the data as we will need access root!
        const { User: addContacts } = !contacts.length ? { User: [] } : await query({ User: contacts.map(i => ({ ...i, get: ['contacts', 'invited'] })) }, { admin: true, readOnly: true })

        const invitedIds = addInvited.map(u => u.reservedId)
        const contactsIds = addContacts.map(u => u.reservedId)
        const userInvitedIds = user.invited.map(u => u.reservedId)
        const userContactsIds = user.contacts.map(u => u.reservedId)
        const allContactsIds = [...userInvitedIds, ...userContactsIds]

        // If the user tries to add itself we deny the request
        if ([...invitedIds, ...contactsIds].includes(userId)) return Promise.reject({ status: 403, message: `User ${userId} cannot add itself as a contact.` })

        // If the user tries to invite someone that already has them as one of their contact member, we make it a contact instead
        const granted = addInvited.filter(contact => [...contact.contacts, ...contact.invited].map(u => u.reservedId).includes(userId))
        granted.forEach(contact => {
          contactsIds.push(contact.id)
          addContacts.push(contact)
          contacts.push(contact)
        })
        if (!request.contacts) request.contacts = {}
        request.contacts.add = contacts

        // If the user invites someone that already invited them, we make them both contacts instead
        const promoted = [...addInvited, ...addContacts].filter(contact => contact.invited.map(u => u.reservedId).includes(userId))
        if (promoted.length) {
          await query({
            User: {
              reservedId: promoted.map(u => u.reservedId), // Look for the users that have current user in their invited list
              invited: { remove: { reservedId: userId } }, // Remove the user from the invited list
              contacts: { add: { reservedId: userId } } // Add the user to the contacts
            }
          }, { admin: true })
        }

        // If the user tries to add and invite someone at the same time, we ignore the invitation
        const duplicates = invitedIds.filter(id => contactsIds.includes(id))
        duplicates.forEach(id => {
          const index = invitedIds.indexOf(id)
          invitedIds.splice(index, 1)
          addInvited.splice(index, 1)
          // Makes sure that the invited constraints can't match the found id
          invited.forEach(u => { if (u.not) u.not.reservedId = id; else u.not = { reservedId: id } })
          request.invited.add = invited
        })
        let alreadyIn
        // If the user tries to add as contact someone that didn't invite them nor has them as contact, we deny the request
        if (alreadyIn = addContacts.find(contact => ![...contact.invited, ...contact.contacts].find(u => u.reservedId === userId))) return Promise.reject({ status: 401, message: `The User ${alreadyIn.reservedId} must invite User ${userId} before User ${userId} can add it as a contact.` })
        // If we try to invite a user already in our contacts or invited list, we deny the request
        else if (alreadyIn = invitedIds.find(id => allContactsIds.includes(id))) return Promise.reject({ status: 403, message: `The User ${alreadyIn} is already in the contacts of User ${userId}.` })
        // If we try to add a contact which is already in our contacts list, we deny the request
        // else if(alreadyIn = contactsIds.find(id => userContactsIds.includes(id))) return Promise.reject({ status: 403, message: `The User ${alreadyIn} is already a contact of User ${userId}.`});
        // If we try to add as contact someone we already invited, we need to remove it from the invited list.
        const alreadyInvited = contactsIds.filter(id => userInvitedIds.includes(id))
        if (alreadyInvited.length > 0) await query({ User: { reservedId: userId, invited: { remove: { reservedId: alreadyInvited } } } }, { admin: true })

        // We need to manually add the users as they don't have enough credence to access another user's data
        if (addInvited.length) {
          await query({ User: { reservedId: userId, invited: { add: addInvited } } }, { admin: true })
          local.invited = addInvited// We save the id to manually add them to the result (cf onResult). This is not necessary, and just for demonstration purpose
        }
      }
    }
  },
  onRequest: {
    Comment: (request, { parent }) => {
      // In case of message creation, the feed might not exist yet
      if (request.create) {
        // We want to make sure that the message belongs to a feed. The way to do so is to ensure that the parent of this request is Feed.
        if (!parent || parent.tableName !== 'Feed') return Promise.reject({ status: 400, message: 'Comments must belong to a feed.' })
      }
      if (request.set) {
        // We update the `lastModification` field each time a modification happens
        const date = new Date().toISOString()
        request.set.lastModification = date
      }
    }
  },
  // This part will edit the results before it is returned to the end user
  onResult: {
    User: async (results, { request, local: { invited } }) => {
      if (request.invited && request.invited.add) {
        // We manually add the list of invited users that could not be added, due to credentials issues. This is just to demonstrate how `local` variable and onResult function might work
        // WARNING: This is probably a security issue. We only do this for demonstration purpose.
        results.forEach(result => result.invited = invited)
      }
    }
  }
}

const app = express()
app.listen(80).on('error', error => {
  console.error(error)
  // @ts-ignore
  if (error.code === 'EACCES') {
    console.log(`It seems that you don't have right to run node on port 80. You should try the following approaches:
    * Run the process as root, then drop the privileges
    * Run the following command to enable node to run on port 80:
        sudo apt-get install libcap2-bin
        sudo setcap cap_net_bind_service=+ep \`readlink -f \\\`which node\\\`\`
  `)
  }
  process.exit()
})

module.exports = async () => {
  const plugins = []

  // Add a plugin enforcing default security parameters in production
  if (process.env.NODE_ENV === 'production') {
    plugins.push(securityPlugin(app, {
      domains: ['mydomain.com', 'www.mydomain.com'],
      webmaster: 'webmaster@mydomain.com'
    }))
  }

  // Add a plugin that enables basic login/password authentication
  plugins.push(loginPlugin({
    login: 'email',
    password: 'password',
    salt: 'salt',
    userTable: 'User'
  }))

  // Add a plugin that enable communication with stripe
  const stripe = await stripePlugin(app, {
    adminKey: database.privateKey,
    customerTable: 'User',
    database: database.database,
    secretKey: 'sk_test_51HfViKKIGDSYwsauSDJubPHtmVntPrwkGE0ZCxyMROd7hpmHaPI5X6aPqC77ot06ZhHmJ5ofNje3pXiJXn44BFx500rwkO05Hi',
    webhookURL: 'http://localhost/stripe-webhook'
  })
  plugins.push(stripe)

  // Add our custom plugin to handle specific behaviours for some requests
  plugins.push(customPlugin)

  return createServer({ app, tables, database, rules, plugins })
}