import {ListWrapper, MapWrapper} from 'angular2/src/facade/collection';

import {isPresent} from 'angular2/src/facade/lang';

import {DirectiveMetadata} from 'angular2/src/render/api';

/**

* Converts a [DirectiveMetadata] to a map representation. This creates a copy,

* that is, subsequent changes to `meta` will not be mirrored in the map.

*/

export function directiveMetadataToMap(meta: DirectiveMetadata): Map<string, any> {

return MapWrapper.createFromPairs([

['id', meta.id],

['selector', meta.selector],

['compileChildren', meta.compileChildren],

['hostListeners', _cloneIfPresent(meta.hostListeners)],

['hostProperties', _cloneIfPresent(meta.hostProperties)],

['hostAttributes', _cloneIfPresent(meta.hostAttributes)],

['hostActions', _cloneIfPresent(meta.hostActions)],

['properties', _cloneIfPresent(meta.properties)],

['readAttributes', _cloneIfPresent(meta.readAttributes)],

['type', meta.type],

['version', 1]

]);

}

/**

* Converts a map representation of [DirectiveMetadata] into a

* [DirectiveMetadata] object. This creates a copy, that is, subsequent changes

* to `map` will not be mirrored in the [DirectiveMetadata] object.

*/

export function directiveMetadataFromMap(map: Map<string, any>): DirectiveMetadata {

return new DirectiveMetadata({

id:<string>MapWrapper.get(map, 'id'),

selector:<string>MapWrapper.get(map, 'selector'),

compileChildren:<boolean>MapWrapper.get(map, 'compileChildren'),

hostListeners:<Map<string, string>>_cloneIfPresent(MapWrapper.get(map, 'hostListeners')),

hostProperties:<Map<string, string>>_cloneIfPresent(MapWrapper.get(map, 'hostProperties')),

hostActions:<Map<string, string>>_cloneIfPresent(MapWrapper.get(map, 'hostActions')),

hostAttributes:<Map<string, string>>_cloneIfPresent(MapWrapper.get(map, 'hostAttributes')),

properties:<Map<string, string>>_cloneIfPresent(MapWrapper.get(map, 'properties')),

readAttributes:<List<string>>_cloneIfPresent(MapWrapper.get(map, 'readAttributes')),

type:<number>MapWrapper.get(map, 'type')

});

}

/**

* Clones the [List] or [Map] `o` if it is present.

*/

function _cloneIfPresent(o) {

if (!isPresent(o)) return null;

return ListWrapper.isList(o) ? ListWrapper.clone(o) : MapWrapper.clone(o);

}