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'use strict';
/**
* Creates a new Model instance and hooks up the storage.
* @constructor
* @param {object} storage A reference to the client side storage class
*/
class Model {
constructor(storage) {
this.storage = storage;
}
/**
* Creates a new todo model
*
* @param {string} [title] The title of the task
* @param {function} [callback] The callback to fire after the model is created
*/
create(title, callback){
title = title || '';
let newItem = {
title: title.trim(),
completed: false
};
this.storage.save(newItem, callback);
}
/**
* Finds and returns a model in storage. If no query is given it'll simply
* return everything. If you pass in a string or number it'll look that up as
* the ID of the model to find. Lastly, you can pass it an object to match
* against.
*
* @param {string|number|object} [query] A query to match models against
* @param {function} [callback] The callback to fire after the model is found
*
* @example
* model.read(1, func) // Will find the model with an ID of 1
* model.read('1') // Same as above
* //Below will find a model with foo equalling bar and hello equalling world.
* model.read({ foo: 'bar', hello: 'world' })
*/
read(query, callback){
const queryType = typeof query;
if (queryType === 'function') {
callback = query;
this.storage.findAll(callback);
} else if (queryType === 'string' || queryType === 'number') {
query = parseInt(query, 10);
this.storage.find({id: query}, callback);
} else {
this.storage.find(query, callback);
}
}
/**
* Updates a model by giving it an ID, data to update, and a callback to fire when
* the update is complete.
*
* @param {number} id The id of the model to update
* @param {object} data The properties to update and their new value
* @param {function} callback The callback to fire when the update is complete.
*/
update(id, data, callback){
this.storage.save(data, callback, id);
}
/**
* Removes a model from storage
*
* @param {number} id The ID of the model to remove
* @param {function} callback The callback to fire when the removal is complete.
*/
remove(id, callback){
this.storage.remove(id, callback);
}
/**
* WARNING: Will remove ALL data from storage.
*
* @param {function} callback The callback to fire when the storage is wiped.
*/
removeAll(callback){
this.storage.drop(callback);
}
/**
* Returns a count of all todos
*/
getCount(callback){
let todos = {
active: 0,
completed: 0,
total: 0
};
this.storage.findAll(data => {
for (let todo of data) {
if (todo.completed) {
todos.completed++;
} else {
todos.active++;
}
todos.total++;
}
if (callback) {
callback(todos);
}
});
}
}