c = require './../schemas'
metaschema = require './../metaschema'

jitterSystemCode = """
class Jitter extends System
  constructor: (world, config) ->
    super world, config
    @idlers = @addRegistry (thang) -> thang.exists and thang.acts and thang.moves and thang.action is 'idle'

  update: ->
    # We return a simple numeric hash that will combine to a frame hash
    # help us determine whether this frame has changed in resimulations.
    hash = 0
    for thang in @idlers
      hash += thang.pos.x += 0.5 - Math.random()
      hash += thang.pos.y += 0.5 - Math.random()
      thang.hasMoved = true
    return hash
"""

PropertyDocumentationSchema = c.object {
  title: 'Property Documentation'
  description: 'Documentation entry for a property this System will add to its Thang which other Systems might want to also use.'
  default:
    name: 'foo'
    type: 'object'
    description: 'This System provides a "foo" property to satisfy all one\'s foobar needs. Use it wisely.'
  required: ['name', 'type', 'description']
},
  name: {type: 'string', pattern: c.identifierPattern, title: 'Name', description: 'Name of the property.'}
  # not actual JS types, just whatever they describe...
  type: c.shortString(title: 'Type', description: 'Intended type of the property.')
  description: {type: 'string', description: 'Description of the property.', maxLength: 1000}
  args: c.array {title: 'Arguments', description: 'If this property has type "function", then provide documentation for any function arguments.'}, c.FunctionArgumentSchema

DependencySchema = c.object {
  title: 'System Dependency'
  description: 'A System upon which this System depends.'
  required: ['original', 'majorVersion']
  format: 'latest-version-reference'
  links: [{rel: 'db', href: '/db/level.system/{(original)}/version/{(majorVersion)}'}]
},
  original: c.objectId(title: 'Original', description: 'A reference to another System upon which this System depends.')
  majorVersion:
    title: 'Major Version'
    description: 'Which major version of the System this System needs.'
    type: 'integer'
    minimum: 0

LevelSystemSchema = c.object {
  title: 'System'
  description: 'A System which can affect Level behavior.'
  required: ['name', 'description', 'code', 'dependencies', 'propertyDocumentation', 'codeLanguage']
  default:
    name: 'JitterSystem'
    description: 'This System makes all idle, movable Thangs jitter around.'
    code: jitterSystemCode
    codeLanguage: 'coffeescript'
    dependencies: []  # TODO: should depend on something by default
    propertyDocumentation: []
}
c.extendNamedProperties LevelSystemSchema  # let's have the name be the first property
LevelSystemSchema.properties.name.pattern = c.classNamePattern
_.extend LevelSystemSchema.properties,
  description:
    title: 'Description'
    description: 'A short explanation of what this System does.'
    type: 'string'
    maxLength: 2000
  codeLanguage:
    type: 'string'
    title: 'Language'
    description: 'Which programming language this System is written in.'
    'enum': ['coffeescript']
  code:
    title: 'Code'
    description: 'The code for this System, as a CoffeeScript class. TODO: add link to documentation for how to write these.'
    type: 'string'
    format: 'coffee'
  js:
    title: 'JavaScript'
    description: 'The transpiled JavaScript code for this System'
    type: 'string'
    format: 'hidden'
  dependencies: c.array {title: 'Dependencies', description: 'An array of Systems upon which this System depends.', uniqueItems: true}, DependencySchema
  propertyDocumentation: c.array {title: 'Property Documentation', description: 'An array of documentation entries for each notable property this System will add to its Level which other Systems might want to also use.'}, PropertyDocumentationSchema
  configSchema: _.extend metaschema, {title: 'Configuration Schema', description: 'A schema for validating the arguments that can be passed to this System as configuration.', default: {type: 'object', additionalProperties: false}}
  official:
    type: 'boolean'
    title: 'Official'
    description: 'Whether this is an official CodeCombat System.'

c.extendBasicProperties LevelSystemSchema, 'level.system'
c.extendSearchableProperties LevelSystemSchema
c.extendVersionedProperties LevelSystemSchema, 'level.system'
c.extendPermissionsProperties LevelSystemSchema
c.extendPatchableProperties LevelSystemSchema

module.exports = LevelSystemSchema