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//
//  ██████╗  █████╗ ████████╗ █████╗     ███████╗████████╗ ██████╗ ██████╗ ███████╗
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//

module.exports = require('machine').build({


  friendlyName: 'Register Data Store',


  description: 'Register a new datastore for making connections.',


  sync: true,


  inputs: {

    identity: {
      description: 'A unique identitifer for the connection.',
      example: 'localPostgres',
      required: true
    },

    config: {
      description: 'The configuration to use for the data store.',
      required: true,
      example: '==='
    },

    models: {
      description: 'The Waterline models that will be used with this data store.',
      required: true,
      example: '==='
    },

    datastores: {
      description: 'An object containing all of the data stores that have been registered.',
      required: true,
      example: '==='
    },

    modelDefinitions: {
      description: 'An object containing all of the model definitions that have been registered.',
      required: true,
      example: '==='
    }

  },


  exits: {

    success: {
      description: 'The data store was initialized successfully.'
    },

    badConfiguration: {
      description: 'The configuration was invalid.',
      outputType: 'ref'
    }

  },


  fn: function registerDataStore(inputs, exits) {
    // Dependencies
    var _ = require('@sailshq/lodash');
    var MySQL = require('machinepack-mysql');
    var Helpers = require('./private');

    // Validate that the datastore isn't already initialized
    if (inputs.datastores[inputs.identity]) {
      return exits.badConfiguration(new Error('Datastore `' + inputs.identity + '` is already registered.'));
    }

    //  ╦  ╦╔═╗╦  ╦╔╦╗╔═╗╔╦╗╔═╗  ┌─┐┌─┐┌┐┌┌─┐┬┌─┐
    //  ╚╗╔╝╠═╣║  ║ ║║╠═╣ ║ ║╣   │  │ ││││├┤ ││ ┬
    //   ╚╝ ╩ ╩╩═╝╩═╩╝╩ ╩ ╩ ╚═╝  └─┘└─┘┘└┘└  ┴└─┘
    // If a URL config value was not given, ensure that all the various pieces
    // needed to create one exist.
    var hasURL = _.has(inputs.config, 'url');

    // Validate that the connection has a host and database property
    if (!hasURL && !inputs.config.host) {
      return exits.badConfiguration(new Error('Datastore  `' + inputs.identity + '` config is missing a host value.'));
    }

    if (!hasURL && !inputs.config.database) {
      return exits.badConfiguration(new Error('Datastore  `' + inputs.identity + '` config is missing a value for the database name.'));
    }

    // Loop through every model assigned to the datastore we're registering,
    // and ensure that each one's primary key is either required or auto-incrementing.
    try {
      _.each(inputs.models, function checkPrimaryKey(modelDef, modelIdentity) {
        var primaryKeyAttr = modelDef.definition[modelDef.primaryKey];

        // Ensure that the model's primary key has either `autoIncrement` or `required`
        if (primaryKeyAttr.required !== true && (!primaryKeyAttr.autoMigrations || primaryKeyAttr.autoMigrations.autoIncrement !== true)) {
          throw new Error('In model `' + modelIdentity + '`, primary key `' + modelDef.primaryKey + '` must have either `required` or `autoIncrement` set.');
        }
      });
    } catch (e) {
      return exits.badConfiguration(e);
    }

    //  ╔═╗╔═╗╔╗╔╔═╗╦═╗╔═╗╔╦╗╔═╗  ┌─┐┌─┐┌┐┌┌┐┌┌─┐┌─┐┌┬┐┬┌─┐┌┐┌
    //  ║ ╦║╣ ║║║║╣ ╠╦╝╠═╣ ║ ║╣   │  │ │││││││├┤ │   │ ││ ││││
    //  ╚═╝╚═╝╝╚╝╚═╝╩╚═╩ ╩ ╩ ╚═╝  └─┘└─┘┘└┘┘└┘└─┘└─┘ ┴ ┴└─┘┘└┘
    //  ┌─┐┌┬┐┬─┐┬┌┐┌┌─┐  ┬ ┬┬─┐┬
    //  └─┐ │ ├┬┘│││││ ┬  │ │├┬┘│
    //  └─┘ ┴ ┴└─┴┘└┘└─┘  └─┘┴└─┴─┘
    // If the connection details were not supplied as a URL, make them into one.
    // This is required for the underlying driver in use.
    if (!_.has(inputs.config, 'url')) {
      var url = 'mysql://';
      var port = inputs.config.port || '5432';

      // If authentication is used, add it to the connection string
      if (inputs.config.user && inputs.config.password) {
        url += inputs.config.user + ':' + inputs.config.password + '@';
      }

      url += inputs.config.host + ':' + port + '/' + inputs.config.database;
      inputs.config.url = url;
    }


    //  ╔═╗╦═╗╔═╗╔═╗╔╦╗╔═╗  ┌┬┐┌─┐┌┐┌┌─┐┌─┐┌─┐┬─┐
    //  ║  ╠╦╝║╣ ╠═╣ ║ ║╣   │││├─┤│││├─┤│ ┬├┤ ├┬┘
    //  ╚═╝╩╚═╚═╝╩ ╩ ╩ ╚═╝  ┴ ┴┴ ┴┘└┘┴ ┴└─┘└─┘┴└─
    // Create a manager to handle the datastore connection config
    var report;
    try {
      report = Helpers.connection.createManager(inputs.config.url, inputs.config);
    } catch (e) {
      if (!e.code || e.code === 'error') {
        return exits.error(new Error('There was an error creating a new manager for the connection with a url of: ' + inputs.config.url + '\n\n' + e.stack));
      }

      if (e.code === 'failed') {
        return exits.badConfiguration(new Error('There was an error creating a new manager for the connection with a url of: ' + inputs.config.url + '\n\n' + e.stack));
      }

      if (e.code === 'malformed') {
        return exits.badConfiguration(new Error('There was an error creating a new manager for the connection with a url of: ' + inputs.config.url + '\n\n' + e.stack));
      }

      return exits.error(new Error('There was an error creating a new manager for the connection with a url of: ' + inputs.config.url + '\n\n' + e.stack));
    }


    // Build up a database schema for this connection that can be used
    // throughout the adapter
    var dbSchema = {};

    _.each(inputs.models, function buildSchema(val) {
      var identity = val.identity;
      var tableName = val.tableName;
      var definition = val.definition;

      dbSchema[tableName] = {
        identity: identity,
        tableName: tableName,
        definition: definition,
        attributes: definition,
        primaryKey: val.primaryKey
      };
    });

    // Store the connection
    inputs.datastores[inputs.identity] = {
      manager: report.manager,
      config: inputs.config,
      driver: MySQL
    };

    // Store the db schema for the connection
    inputs.modelDefinitions[inputs.identity] = dbSchema;

    return exits.success();
  }
});