import {PropertyMemberDoc} from 'dgeni-packages/typescript/api-doc-types/PropertyMemberDoc';
import {hasMemberDecorator} from './decorators';

/** Interface that describes an Angular property binding. Can be either an input or output. */
export interface PropertyBinding {
  name: string;
  alias?: string;
}

/**
 * Detects whether the specified property member is an input. If the property is an input, the
 * alias and input name will be returned.
 */
export function getInputBindingData(doc: PropertyMemberDoc, metadata: Map<string, any>)
    : PropertyBinding | undefined {
  return getBindingPropertyData(doc, metadata, 'inputs', 'Input');
}

/**
 * Detects whether the specified property member is an output. If the property is an output, the
 * alias and output name will be returned.
 */
export function getOutputBindingData(doc: PropertyMemberDoc, metadata: Map<string, any>)
    : PropertyBinding | undefined {
  return getBindingPropertyData(doc, metadata, 'outputs', 'Output');
}

/**
 * Method that detects the specified type of property binding (either "output" or "input") from
 * the directive metadata or from the associated decorator on the property.
 */
function getBindingPropertyData(doc: PropertyMemberDoc, metadata: Map<string, any>,
                                propertyName: string, decoratorName: string) {

  if (metadata) {
    const metadataValues: string[] = metadata.get(propertyName) || [];
    const foundValue = metadataValues.find(value => value.split(':')[0] === doc.name);

    if (foundValue) {
      return {
        name: doc.name,
        alias: foundValue.split(':')[1]
      };
    }
  }

  if (hasMemberDecorator(doc, decoratorName)) {
    return {
      name: doc.name,
      alias: doc.decorators!.find(d => d.name == decoratorName)!.arguments![0]
    };
  }

  return undefined;
}