var utils = require('loopback-datasource-juggler/lib/utils');

var _ = require('lodash');

module.exports = function (Meta) {

/**

* Helper method for format the type of the properties

*/

function formatProperties (properties) {

var result = {};

for (var key in properties) {

result[key] = _.clone(properties[key]);

result[key].type = properties[key].type.name;

}

return result;

}

/**

* Get the definition of a model and format the result in a way that's similar to a LoopBack model definition file

*/

function getModelInfo (modelName) {

// Get the model

var model = Meta.app.models[modelName];

// Create the base return object

var result = {

id: model.definition.name,

name: model.definition.name,

properties: formatProperties(model.definition.properties)

};

// Get the following keys from the settings object, if they are set

var keys = ['description', 'plural', 'base', 'idInjection', 'persistUndefinedAsNull', 'strict', 'hidden',

'validations', 'relations', 'acls', 'methods', 'mixins'

];

keys.forEach(function (key) {

result[key] = _.get(model.definition.settings, key);

});

return result;

}

/**

* Get all the models with its information

*/

Meta.getModels = function (cb) {

cb = cb || utils.createPromiseCallback();

var modelNames = Object.keys(Meta.app.models);

process.nextTick(function () {

cb(null, modelNames.sort().map(function (modelName) {

return getModelInfo(modelName);

}));

});

return cb.promise;

};

/**

* Get one model with its information

*/

Meta.getModelById = function (modelName, cb) {

cb = cb || utils.createPromiseCallback();

process.nextTick(function () {

cb(null, getModelInfo(modelName));

});

return cb.promise;

};

};