var Cation    = require('cation')
var container = new Cation()
var Atom      = function() { /* Atom service! */ }

container.register('Atom', Atom)

container.get('Atom').then(function(atom) {
  /* new atom object! */
})

var Atom = function() { /* Atom constructor */ }

var Cation    = require('cation')
var container = new Cation()

container.register('Atom', Atom)

container.get('Atom').then(function(atom) {
    // a new Atom instance over here!
})

// or...

var getAtomPromise = container.get('Atom')

getAtomPromise.then(function(atom) {
    // a new Atom instance over here!
})

var Element = function(name, symbol, atomicNumber, atomicWeight) {
  this.name         = name
  this.symbol       = symbol
  this.atomicNumber = atomicNumber
  this.atomicWeight = atomicWeight
}

container.register('Hydrogen', Element, {
  args: ['Hydrogen', 'H', 1, 1.008]
})

container.get('Hydrogen').then(function(element) {
  console.log(element.name) // Hydrogen
})

// HEADS UP!
//
// For the sake of "simplicity", I'm going to use a few ES6 features in this example.
//
// The third argument here, ...elements, is known as a "rest parameter" and is part of the ES6 specification.
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters
var Compound = function(name, formula, ...elements) {
  this.name     = name
  this.formula  = formula
  this.elements = elements

  this.getMolarMass = function() {
    // HEADS UP!
    // I'm using "arrow functions" here. It's also part of ES6.
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
    return this.elements
      .map(element => element.atomicWeight)
      .reduce((accumulator, weight) => accumulator + weight)
  }
}

container.register('Hydrogen', Element, {
  args: ['Hydrogen', 'H', 1, 1.008]
})

container.register('Oxygen', Element, {
  args: ['Oxygen', 'O', 8, 15.999]
})

// This. Read it carefully...
container.register('Water', Compound, {
  args: ['Water', 'H2O', '@Hydrogen', '@Oxygen', '@Hydrogen'] // notice the "@"?
})

container.get('Water').then(function(molecule) {
  console.log(molecule.formula) // H2O
  console.log(molecule.getMolarMass()) // 18.015
})

container.register('Something', Something, {
  args: ['@ServiceReference', '\\@NormalStringArgument']
})

container.register('SingletonService', Service, {
  singleton: true
})

{
  type       : 'service',
  singleton  : true,
  args       : ['a', 2, '@B'],
  decorators : ['decorator1', 'decorator2']
}

{
  singleton  : true,
  args       : ['a', 2, '@B'],
  decorators : ['decorator1', 'decorator2']
}

{
  args      : []
  singleton : true
}

{
  singleton: true
}

// if you know how promises work, you'll notice that this code block can be
// simpliflied by just returning the execution of Promise.all().then().
// I'll keep this example to explicitly show the returned promise.
container.register('ServiceC', function(container) {
  var factoryPromise = new Promise(function(resolveFactoryPromise, rejectFactoryPromise) {
    var depencencyAPromise = container.get('ServiceA')
    var dependencyBPromise = container.get('ServiceB')

    // main promise will resolve when all dependency promises are resolved
    Promise.all([dependencyAPromise, dependencyBPromise]).then(function(services) {
      // our resolved services
      var dependencyA = service[0]
      var dependencyB = service[1]

      dependencyA.doSomething()
      dependencyB.property = 'Something Else'

      resolveFactoryPromise(new ServiceC(dependencyA, dependencyB))
    }).catch(function(error) {
      rejectFactoryPromise(error)
    })
  })

  return factoryPromise
}, {
  type: 'factory'
})

container.get('ServiceC').then(function(serviceObject) {
  // do something with serviceObject
})

// and this is the simplified version of the above implementation
container.register('ServiceC', function(container) {
  var depencencyAPromise = container.get('ServiceA')
  var dependencyBPromise = container.get('ServiceB')

  // we return the promise chain.
  // remember, if you return something inside a promise, you'll get a promise whose
  // resolved value is whatever you returned in the latter.
  // `promise chaining` if you want to call it by a name.
  return Promise.all([dependencyAPromise, dependencyBPromise]).then(function(services) {
    // our resolved services
    var dependencyA = services[0]
    var dependencyB = services[1]

    dependencyA.doSomething()
    dependencyB.property = 'Something Else'

    // return something to create another promise that will be handled by you
    // on `Cation#get` call.
    return new ServiceC(dependencyA, dependencyB)
  })
}, {
  type: 'factory'
})

container.get('ServiceC').then(function(serviceObject) {
  // still works!
})

// register a static resource
container.register('hydrogen-atomic-weight', 1.008, {
  type: 'static'
})

// use the resource as a dependency in a service
container.register('Hydrogen', Element, {
  args: ['Hydrogen', 'H', 1, '@hydrogen-atomic-weight']
})

// Example inspired by "Learning JavaScript Design Patterns" book by Addy Osmani

function BasicMacBookProRetina() {
  this.resolution = function() { return 13 }
  this.storage    = function() { return 128 }
  this.cpu        = function() { return '2.6GHz dual-core Intel Core i5' }
  this.price      = function() { return 1299 }
  this.toString   = function() {
    return '%in%-inch MacBook Pro with Retina Display. Storage: %storage%GB. CPU: %cpu%. Price: $%price%.'
      .replace(/%in%/, this.resolution())
      .replace(/%storage%/, this.storage())
      .replace(/%cpu%/, this.cpu())
      .replace(/%price%/, this.price())
  }
}

container.addDecorator('storage', function(macbook) {
  var originalStorage = macbook.storage()
  var originalCost    = macbook.cost()

  macbook.storage = function() { return originalStorage * 2 }
  macbook.cost    = function() { return cost + 200 }

  return macbook
})

container.addDecorator('cpu', function(macbook) {
  var originalCost = macbook.cost()

  macbook.cost = function() { return originalCost + 100 }
  macbook.cpu  = function() { return '2.8GHz dual-core Intel Core i5' }

  return macbook
})

// 128GB storage version
container.register('13in-MBP-Retina-128', BasicMacBookProRetina)

// 256GB storage version
container.register('13in-MBP-Retina-256', BasicMacBookProRetina, {
  decorators: ['storage']
})

// 512GB storage + higher freq CPU
container.register('13in-MBP-Retina-512', BasicMacBookProRetina, {
  decorators: ['storage', 'storage', 'cpu']
})

// ----

container.get('13in-MBP-Retina-128').then(function(macbook) {
  console.log(macbook)
  // 13-inch MacBook Pro with Retina Display. Storage: 128GB. CPU: 2.6GHz dual-core Intel Core i5. Price: $1299.
})

container.get('13in-MBP-Retina-256').then(function(macbook) {
  console.log(macbook)
  // 13-inch MacBook Pro with Retina Display. Storage: 256GB. CPU: 2.6GHz dual-core Intel Core i5. Price: $1499.
})

container.get('13in-MBP-Retina-512').then(function(macbook) {
  console.log(macbook)
  // 13-inch MacBook Pro with Retina Display. Storage: 512GB. CPU: 2.8GHz dual-core Intel Core i5. Price: $1799.
})

/**
 * The GhostProvider will register a new static resource every time you
 * register something using this type.
 * Also, it provides a "Boo! 👻" string when trying to retrieve the registered resource.
 *
 * @param {Cation} container A Cation instance
 * @param {String} id        The Resource ID
 * @param {mixed}  resource  The Resource Object
 * @param {Object} options   The register options
 */
function GhostProvider(container, id, resource, options) {
  // All ResourceProviders are created with these args, always.
  this.container = container
  this.id        = id
  this.resource  = resource
  this.options   = options

  this.container.register(
    '%id%-gravestone'.replace(/%id%/, this.id),
    'Here lies %id%. %date% - %date%. RIP'
      .replace(/%id%/, this.id)
      .replace(/%date%/, new Date().toDateString())
    ,
    { type: 'static' }
  )

  // This is where magic happens...
  // You must ALWAYS implement a `get` method.
  this.get = function() {
    // And this method should ALWAYS return a new Promise.
    return new Promise(function(resolve) {
      // NEVER forget to resolve the promise with whatever you want to return on `Cation#get`. Never.
      resolve('Boo! 👻')
    })
  }
}

container.addProvider('ghost', GhostProvider)

container.register('DeadResource', 'resource value', {
  type: 'ghost'
})

// and here... we... GO.

container.get('DeadResource').then(function(resource) {
  console.log(resource) // Boo! 👻

  return container.get('DeadResource-gravestone')
}).then(function(gravestone) {
  console.log(gravestone) // Here lies DeadResource. Wed Jan 28 2015 - Wed Jan 28 2015. RIP
})

var container1 = new Cation({ id: 'c-1' })
var container2 = new Cation({ id: 'c-2' })

console.log(container1.getId()) // c-1
console.log(container2.getId()) // c-2

// https://github.com/wycats/handlebars.js
container.register('Handlebars', Handlebars, {
  type: 'static'
})

function HandlebarsCompiler(Handlebars) {
  this.compile = function(source, data) {
    var template = Handlebars.compile(source)

    return template(data)
  }
}

container.register('HandlebarsCompiler', HandlebarsCompiler, {
  args: ['@Handlebars'],
  tags: ['framework.view.compiler']
})

// somewhere,
// in your awesome new JS framework...

var compilerId = container.findTaggedResourceIds('framework.view.compiler').shift()

container.get(compilerId).then(function(compiler) {
  var source = loadHtmlSource() // load template files
  var data   = loadTemplateData() // data to be injected inside of templates

  var result = compiler.compile(source, data)
})

// now, if you want another compiler

// https://github.com/paularmstrong/swig
container.register('Swig', swig, {
  type: 'static'
})

function SwigCompiler(Swig) {
  this.compile = function(source, data) {
    return Swig.render(source, { locals: data })
  }
}

container.register('SwigCompiler', SwigCompiler, {
  args: ['@Swig'],
  tags: ['framework.view.compiler']
})

// you can do really cool things with this new feature. A little more complex example
// could have been loading all tagged compilers and make them compile .hbs or
// .swig templates, with just one function:
// container.get(compilerId).then(function(compiler) { ... })

// just go and make awesome things :)