import * as fs from "fs";
import { extractExtension } from '../../Utils'
import { File } from "../../core/File";
import { Plugin } from "../../core/WorkflowContext";
import { IPathInformation } from '../../core/PathMaster';
import { CSSPluginClass } from "../stylesheet/CSSplugin";
import { LESSPluginClass } from "../stylesheet/LESSPlugin";
import { SassPluginClass } from "../stylesheet/SassPlugin";
import { StylusPluginClass } from "../stylesheet/StylusPlugin";
import { FuseBoxHTMLPlugin } from "../HTMLplugin";
import { BabelPluginClass } from '../js-transpilers/BabelPlugin';
import { CoffeePluginClass } from '../js-transpilers/CoffeePlugin';
import { ConsolidatePluginClass } from '../ConsolidatePlugin';
const PLUGIN_LANG_MAP = new Map<string, any>()
        .set('css', new CSSPluginClass())
        .set('less', new LESSPluginClass())
        .set('scss', new SassPluginClass({ importer: true }))
        .set('styl', new StylusPluginClass())
        .set('html', new FuseBoxHTMLPlugin())
        .set('js', new BabelPluginClass())
        .set('ts', null) // Null - just use the bog standard TS compiler, no need for plugins
        .set('coffee', new CoffeePluginClass());

export abstract class VueBlockFile extends File {
  constructor(
    public file: File,
    public info: IPathInformation,
    public block: any,
    public scopeId: string,
    public pluginChain: Plugin[]
  ) {
    super(file.context, info);
    this.collection = file.collection;
    this.context.extensionOverrides && this.context.extensionOverrides.setOverrideFileInfo(this);
    this.ignoreCache = true;
  }

  public setPluginChain(block: any, pluginChain: Plugin[]) {
    const defaultExtension = extractExtension(this.info.fuseBoxPath);

    if (pluginChain.length === 0 && !block.lang) {
      if (defaultExtension === 'js' && this.context.useTypescriptCompiler) {
        pluginChain.push(PLUGIN_LANG_MAP.get('ts'));
      } else if (block.type === 'template' && extractExtension(this.info.absPath) !== 'html') {
        pluginChain.push(new ConsolidatePluginClass({
          engine: extractExtension(this.info.absPath)
        }));
      } else {
        pluginChain.push(PLUGIN_LANG_MAP.get(defaultExtension));
      }
    }

    if (pluginChain.length === 0 && block.lang) {
      if ((defaultExtension === 'js' && this.context.useTypescriptCompiler) || block.lang === 'ts') {
        pluginChain.push(PLUGIN_LANG_MAP.get('ts'));
      } else {
        const PluginToUse = PLUGIN_LANG_MAP.get(block.lang.toLowerCase());

        if (!PluginToUse) {
          if (block.type === 'template') {
            pluginChain.push(new ConsolidatePluginClass({
              engine: block.lang.toLowerCase()
            }));
          } else {
            const message = `VueComponentClass - cannot find a plugin to transpile lang="${block.lang}"`;
            this.context.log.echoError(message);
            return Promise.reject(new Error(message));
          }
        } else {
          pluginChain.push(PluginToUse);
        }

        if (block.type === 'style' && !(PluginToUse instanceof CSSPluginClass)) {
          pluginChain.push(PLUGIN_LANG_MAP.get('css'));
        }
      }
    }

    const pluginChainString = this.pluginChain.map((plugin) => {
      return (plugin) ? plugin.constructor.name : 'TypeScriptCompiler'
    }).join(' → ');

    this.context.debug('VueComponentClass', `using ${pluginChainString} for ${this.info.fuseBoxPath}`);
  }

  public loadContents() {
    if (this.isLoaded) {
        return;
    }

    if (this.block.src || this.hasExtensionOverride) {
      try {
        this.contents = fs.readFileSync(this.info.absPath).toString();
      } catch (e) {
        this.context.log.echoError(`VueComponentPlugin - Could not load external file ${this.info.absPath}`);
      }
    } else {
      this.contents = this.block.content;
    }

    this.isLoaded = true;
  }

  public abstract async process(): Promise<void>;
}