/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {COMPILER_OPTIONS, Compiler, CompilerFactory, CompilerOptions, Component, Inject, Injectable, PLATFORM_DIRECTIVES, PLATFORM_INITIALIZER, PLATFORM_PIPES, PlatformRef, ReflectiveInjector, Type, ViewEncapsulation, createPlatformFactory, isDevMode, platformCore} from '@angular/core';

export * from './template_parser/template_ast';
export {TEMPLATE_TRANSFORMS} from './template_parser/template_parser';
export {CompilerConfig, RenderTypes} from './config';
export * from './compile_metadata';
export * from './offline_compiler';
export {RuntimeCompiler} from './runtime_compiler';
export * from './url_resolver';
export * from './xhr';

export {DirectiveResolver} from './directive_resolver';
export {PipeResolver} from './pipe_resolver';
export {NgModuleResolver} from './ng_module_resolver';

import {stringify} from './facade/lang';
import {ListWrapper} from './facade/collection';
import {TemplateParser} from './template_parser/template_parser';
import {HtmlParser} from './ml_parser/html_parser';
import {DirectiveNormalizer} from './directive_normalizer';
import {CompileMetadataResolver} from './metadata_resolver';
import {StyleCompiler} from './style_compiler';
import {ViewCompiler} from './view_compiler/view_compiler';
import {NgModuleCompiler} from './ng_module_compiler';
import {CompilerConfig} from './config';
import {RuntimeCompiler} from './runtime_compiler';
import {ElementSchemaRegistry} from './schema/element_schema_registry';
import {DomElementSchemaRegistry} from './schema/dom_element_schema_registry';
import {UrlResolver, DEFAULT_PACKAGE_URL_PROVIDER} from './url_resolver';
import {Parser} from './expression_parser/parser';
import {Lexer} from './expression_parser/lexer';
import {DirectiveResolver} from './directive_resolver';
import {PipeResolver} from './pipe_resolver';
import {NgModuleResolver} from './ng_module_resolver';
import {Console, Reflector, reflector, ReflectorReader, ReflectionCapabilities} from '../core_private';
import {XHR} from './xhr';

const _NO_XHR: XHR = {
  get(url: string): Promise<string>{
      throw new Error(`No XHR implementation has been provided. Can't read the url "${url}"`);}
};

/**
 * A set of providers that provide `RuntimeCompiler` and its dependencies to use for
 * template compilation.
 */
export const COMPILER_PROVIDERS: Array<any|Type|{[k: string]: any}|any[]> = [
  {provide: Reflector, useValue: reflector},
  {provide: ReflectorReader, useExisting: Reflector},
  {provide: XHR, useValue: _NO_XHR},
  Console,
  Lexer,
  Parser,
  HtmlParser,
  TemplateParser,
  DirectiveNormalizer,
  CompileMetadataResolver,
  DEFAULT_PACKAGE_URL_PROVIDER,
  StyleCompiler,
  ViewCompiler,
  NgModuleCompiler,
  {provide: CompilerConfig, useValue: new CompilerConfig()},
  RuntimeCompiler,
  {provide: Compiler, useExisting: RuntimeCompiler},
  DomElementSchemaRegistry,
  {provide: ElementSchemaRegistry, useExisting: DomElementSchemaRegistry},
  UrlResolver,
  DirectiveResolver,
  PipeResolver,
  NgModuleResolver
];


export function analyzeAppProvidersForDeprecatedConfiguration(appProviders: any[] = []):
    {compilerOptions: CompilerOptions, moduleDeclarations: Type[], deprecationMessages: string[]} {
  let platformDirectives: any[] = [];
  let platformPipes: any[] = [];

  let compilerProviders: any[] = [];
  let useDebug: boolean;
  let useJit: boolean;
  let defaultEncapsulation: ViewEncapsulation;
  const deprecationMessages: string[] = [];

  // Note: This is a hack to still support the old way
  // of configuring platform directives / pipes and the compiler xhr.
  // This will soon be deprecated!
  const tempInj = ReflectiveInjector.resolveAndCreate(appProviders);
  const compilerConfig: CompilerConfig = tempInj.get(CompilerConfig, null);
  if (compilerConfig) {
    platformDirectives = compilerConfig.platformDirectives;
    platformPipes = compilerConfig.platformPipes;
    useJit = compilerConfig.useJit;
    useDebug = compilerConfig.genDebugInfo;
    defaultEncapsulation = compilerConfig.defaultEncapsulation;
    deprecationMessages.push(
        `Passing CompilerConfig as a regular provider is deprecated. Use the "compilerOptions" parameter of "bootstrap()" or use a custom "CompilerFactory" platform provider instead.`);
  } else {
    // If nobody provided a CompilerConfig, use the
    // PLATFORM_DIRECTIVES / PLATFORM_PIPES values directly if existing
    platformDirectives = tempInj.get(PLATFORM_DIRECTIVES, []);
    platformPipes = tempInj.get(PLATFORM_PIPES, []);
  }
  platformDirectives = ListWrapper.flatten(platformDirectives);
  platformPipes = ListWrapper.flatten(platformPipes);
  const xhr = tempInj.get(XHR, null);
  if (xhr) {
    compilerProviders.push([{provide: XHR, useValue: xhr}]);
    deprecationMessages.push(
        `Passing XHR as regular provider is deprecated. Pass the provider via "compilerOptions" instead.`);
  }

  if (platformDirectives.length > 0) {
    deprecationMessages.push(
        `The PLATFORM_DIRECTIVES provider and CompilerConfig.platformDirectives is deprecated. Add the directives to an NgModule instead! ` +
        `(Directives: ${platformDirectives.map(type => stringify(type))})`);
  }
  if (platformPipes.length > 0) {
    deprecationMessages.push(
        `The PLATFORM_PIPES provider and CompilerConfig.platformPipes is deprecated. Add the pipes to an NgModule instead! ` +
        `(Pipes: ${platformPipes.map(type => stringify(type))})`);
  }
  const compilerOptions: CompilerOptions = {
    useJit: useJit,
    useDebug: useDebug,
    defaultEncapsulation: defaultEncapsulation,
    providers: compilerProviders
  };

  // Declare a component that uses @Component.directives / pipes as these
  // will be added to the module declarations only if they are not already
  // imported by other modules.
  @Component({directives: platformDirectives, pipes: platformPipes, template: ''})
  class DynamicComponent {
  }

  return {
    compilerOptions,
    moduleDeclarations: [DynamicComponent],
    deprecationMessages: deprecationMessages
  };
}

@Injectable()
export class RuntimeCompilerFactory implements CompilerFactory {
  private _defaultOptions: CompilerOptions[];
  constructor(@Inject(COMPILER_OPTIONS) defaultOptions: CompilerOptions[]) {
    this._defaultOptions = [<CompilerOptions>{
                             useDebug: isDevMode(),
                             useJit: true,
                             defaultEncapsulation: ViewEncapsulation.Emulated
                           }].concat(defaultOptions);
  }
  createCompiler(options: CompilerOptions[] = []): Compiler {
    const mergedOptions = _mergeOptions(this._defaultOptions.concat(options));
    const injector = ReflectiveInjector.resolveAndCreate([
      COMPILER_PROVIDERS, {
        provide: CompilerConfig,
        useFactory: () => {
          return new CompilerConfig({
            // let explicit values from the compiler options overwrite options
            // from the app providers. E.g. important for the testing platform.
            genDebugInfo: mergedOptions.useDebug,
            // let explicit values from the compiler options overwrite options
            // from the app providers
            useJit: mergedOptions.useJit,
            // let explicit values from the compiler options overwrite options
            // from the app providers
            defaultEncapsulation: mergedOptions.defaultEncapsulation,
            logBindingUpdate: mergedOptions.useDebug
          });
        },
        deps: []
      },
      mergedOptions.providers
    ]);
    return injector.get(Compiler);
  }
}

function _initReflector() {
  reflector.reflectionCapabilities = new ReflectionCapabilities();
}

/**
 * A platform that included corePlatform and the compiler.
 *
 * @experimental
 */
export const platformCoreDynamic = createPlatformFactory(platformCore, 'coreDynamic', [
  {provide: COMPILER_OPTIONS, useValue: {}, multi: true},
  {provide: CompilerFactory, useClass: RuntimeCompilerFactory},
  {provide: PLATFORM_INITIALIZER, useValue: _initReflector, multi: true},
]);

function _mergeOptions(optionsArr: CompilerOptions[]): CompilerOptions {
  return {
    useDebug: _lastDefined(optionsArr.map(options => options.useDebug)),
    useJit: _lastDefined(optionsArr.map(options => options.useJit)),
    defaultEncapsulation: _lastDefined(optionsArr.map(options => options.defaultEncapsulation)),
    providers: _mergeArrays(optionsArr.map(options => options.providers))
  };
}

function _lastDefined<T>(args: T[]): T {
  for (var i = args.length - 1; i >= 0; i--) {
    if (args[i] !== undefined) {
      return args[i];
    }
  }
  return undefined;
}

function _mergeArrays(parts: any[][]): any[] {
  let result: any[] = [];
  parts.forEach((part) => part && result.push(...part));
  return result;
}