#!/usr/bin/env node

/**
 * Extract i18n messages from source code
 */

// Must be imported first, because angular2 decorators throws on load.
import 'reflect-metadata';

import * as ts from 'typescript';
import * as tsc from '@angular/tsc-wrapped';
import * as path from 'path';
import * as compiler from '@angular/compiler';

import {StaticReflector} from './static_reflector';
import {
  CompileMetadataResolver,
  HtmlParser,
  DirectiveNormalizer,
  Lexer,
  Parser,
  TemplateParser,
  DomElementSchemaRegistry,
  StyleCompiler,
  ViewCompiler,
  TypeScriptEmitter,
  MessageExtractor,
  removeDuplicates,
  ExtractionResult,
  Message,
  ParseError,
  serializeXmb,
} from './compiler_private';

import {Parse5DomAdapter} from '@angular/platform-server';

import {NodeReflectorHost} from './reflector_host';
import {StaticAndDynamicReflectionCapabilities} from './static_reflection_capabilities';


function extract(ngOptions: tsc.AngularCompilerOptions, program: ts.Program, host: ts.CompilerHost) {
  return Extractor.create(ngOptions, program, host).extract();
}

const GENERATED_FILES = /\.ngfactory\.ts$|\.css\.ts$|\.css\.shim\.ts$/;

class Extractor {
  constructor(private options: tsc.AngularCompilerOptions,
              private program: ts.Program, public host: ts.CompilerHost,
              private staticReflector: StaticReflector, private resolver: CompileMetadataResolver,
              private compiler: compiler.OfflineCompiler,
              private reflectorHost: NodeReflectorHost, private _extractor: MessageExtractor) {}

  private extractCmpMessages(metadatas: compiler.CompileDirectiveMetadata[]): Promise<ExtractionResult> {
    if (!metadatas || !metadatas.length) {
      return null;
    }

    const normalize = (metadata: compiler.CompileDirectiveMetadata) => {
      const directiveType = metadata.type.runtime;
      const directives = this.resolver.getViewDirectivesMetadata(directiveType);
      return Promise.all(directives.map(d => this.compiler.normalizeDirectiveMetadata(d)))
        .then(normalizedDirectives => {
          const pipes = this.resolver.getViewPipesMetadata(directiveType);
          return new compiler.NormalizedComponentWithViewDirectives(metadata,
            normalizedDirectives, pipes);
        });
    };

    return Promise
      .all(metadatas.map(normalize))
      .then((cmps: compiler.NormalizedComponentWithViewDirectives[]) => {
        let messages: Message[] = [];
        let errors: ParseError[] = [];
        cmps.forEach(cmp => {
          // TODO(vicb): url
          let result = this._extractor.extract(cmp.component.template.template, "url");
          errors = errors.concat(result.errors);
          messages = messages.concat(result.messages);
        });

        // Extraction Result might contain duplicate messages at this point
        return new ExtractionResult(messages, errors);
      });
  }

  private readComponents(absSourcePath: string) {
    const result: Promise<compiler.CompileDirectiveMetadata>[] = [];
    const metadata = this.staticReflector.getModuleMetadata(absSourcePath);
    if (!metadata) {
      console.log(`WARNING: no metadata found for ${absSourcePath}`);
      return result;
    }

    const symbols = Object.keys(metadata['metadata']);
    if (!symbols || !symbols.length) {
      return result;
    }
    for (const symbol of symbols) {
      const staticType = this.reflectorHost.findDeclaration(absSourcePath, symbol, absSourcePath);
      let directive: compiler.CompileDirectiveMetadata;
      directive = this.resolver.maybeGetDirectiveMetadata(<any>staticType);

      if (!directive || !directive.isComponent) {
        continue;
      }
      result.push(this.compiler.normalizeDirectiveMetadata(directive));
    }
    return result;
  }

  extract(): Promise<any> {
    Parse5DomAdapter.makeCurrent();

    const promises = this.program.getSourceFiles()
      .map(sf => sf.fileName)
      .filter(f => !GENERATED_FILES.test(f))
      .map((absSourcePath:string): Promise<any> =>
        Promise
          .all(this.readComponents(absSourcePath))
          .then(metadatas => this.extractCmpMessages(metadatas))
          .catch(e => console.error(e.stack))
      );

    let messages: Message[] = [];
    let errors: ParseError[] = [];

    return Promise.all(promises)
      .then(extractionResults => {
        extractionResults
          .filter(result => !!result)
          .forEach(result => {
            messages = messages.concat(result.messages);
            errors = errors.concat(result.errors);
          });

        if (errors.length) {
          throw errors;
        }

        messages = removeDuplicates(messages);

        let genPath = path.join(this.options.genDir, 'messages.xmb');
        let msgBundle = serializeXmb(messages);

        this.host.writeFile(genPath, msgBundle, false);
      });
  }

  static create(options: tsc.AngularCompilerOptions, program: ts.Program,
                compilerHost: ts.CompilerHost): Extractor {
    const xhr: compiler.XHR = {get: (s: string) => Promise.resolve(compilerHost.readFile(s))};
    const urlResolver: compiler.UrlResolver = compiler.createOfflineCompileUrlResolver();
    const reflectorHost = new NodeReflectorHost(program, compilerHost, options);
    const staticReflector = new StaticReflector(reflectorHost);
    StaticAndDynamicReflectionCapabilities.install(staticReflector);
    const htmlParser = new HtmlParser();
    const config = new compiler.CompilerConfig(true, true, true);
    const normalizer = new DirectiveNormalizer(xhr, urlResolver, htmlParser, config);
    const parser = new Parser(new Lexer());
    const tmplParser = new TemplateParser(parser, new DomElementSchemaRegistry(), htmlParser,
      /*console*/ null, []);
    const offlineCompiler = new compiler.OfflineCompiler(
      normalizer, tmplParser, new StyleCompiler(urlResolver),
      new ViewCompiler(config),
      new TypeScriptEmitter(reflectorHost), xhr);
    const resolver = new CompileMetadataResolver(
      new compiler.DirectiveResolver(staticReflector), new compiler.PipeResolver(staticReflector),
      new compiler.ViewResolver(staticReflector), null, null, staticReflector);

    // TODO(vicb): handle implicit
    const extractor = new MessageExtractor(htmlParser, parser, [], {});

    return new Extractor(options, program, compilerHost, staticReflector, resolver,
      offlineCompiler, reflectorHost, extractor);
  }
}

// Entry point
if (require.main === module) {
  const args = require('minimist')(process.argv.slice(2));
  tsc.main(args.p || args.project || '.', args.basePath, extract)
    .then(exitCode => process.exit(exitCode))
    .catch(e => {
      console.error(e.stack);
      console.error("Compilation failed");
      process.exit(1);
    });
}