import * as fs from "fs";
import * as path from "path";
import { RJLog } from "../log/RJLog";

export class PagesInfo
{
  pages:string[] = [];
}

export class PHPPagesBuilder
{
  inputDir:string;
  outputDir:string;

  constructor( source:string, build:string ) 
  {
    this.inputDir = source; 
    this.outputDir = build;
  }

  filterFiles( fileName:string ) 
  {
    if ( fileName.startsWith( "__" ) )
    {
      return false;
    }
    
    return fileName.endsWith( ".html" );
  }

  modify( content:string ) 
  {
    return `<?php ?>\n${content}`;
  }

  apply( compiler:any ) 
  {
    compiler.hooks.afterCompile.tapAsync( "PHPPagesBuilder", 
      ( compilation:any, callback:any ) => 
      {
      
        if ( fs.existsSync( this.inputDir ) ) 
        {
          fs.readdirSync( this.inputDir )
            .filter( this.filterFiles )
            .forEach( 
              ( file ) => 
              {
                let fullPath = path.join(this.inputDir, file);
                compilation.fileDependencies.add(fullPath); // Mark for watching
              }
            );
          
          
        }

        callback();

      }
    );

    compiler.hooks.emit.tapAsync( "PHPPagesBuilder", 
      ( compilation:any, callback:any ) => 
      {
        fs.readdir( this.inputDir, 
          ( err, files ) => 
          {
            if ( err ) 
            { 
              RJLog.log( "Error", this.inputDir );
              return callback( err ); 
            }

            let pages = new PagesInfo();
            files.filter( this.filterFiles ).forEach( ( file ) => 
              {
                let filePath = path.join( this.inputDir, file );
                let content = fs.readFileSync( filePath, "utf-8" );
                let modifiedContent = this.modify( content );
                let phpFileName = file.replace( ".html", ".php" );
                let outputFileName = path.join( this.outputDir, phpFileName );

                pages.pages.push( phpFileName );

                compilation.assets[ outputFileName ] = 
                {
                  source: () => modifiedContent,
                  size: () => modifiedContent.length,
                };
              }
            );

            let pagesPath = path.join( this.outputDir, "pages.json" );

            let pagesJSON = JSON.stringify( pages, null, "  " );

            compilation.assets[ pagesPath ] = 
            {
              source: () => pagesJSON,
              size: () => pagesJSON.length,
            };

            callback();

          } 
        );
      }
    );
  }
}