const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ForkCheckerPlugin = require('awesome-typescript-loader').ForkCheckerPlugin;
import * as webpack from 'webpack';
import * as extend from 'extend';
import addRequires from './utils/addRequires'

const uglifyDefaults = 
	{ compress:
		{ warnings:false
		, unused:true
		, dead_code:true 
		}
	, output:
		{ comments:true
		}
	};

const extractTextDefaults = {allChunks:true}

export function getPluginsPrep(o:WPACK.OPTS,extensions:string[]){

	const 
		{ isProd
		, isServer
		, isDev
		, isClient
		, isDevServer
		, doCopyFiles
		, doCompileStyles
		} = o

	const USES_TYPESCRIPT = extensions.indexOf('ts')>=0;

	const copyConfig = doCopyFiles &&
		{ from: o.copyFiles.from
		, to:   o.copyFiles.to
		}; 

	const uglify = extend(true,{},uglifyDefaults,o.uglify);
	const extractText = extend(true,{},extractTextDefaults,o.extractText);

	return (
		{ isProd
		, isDevServer
		, isServer
		, isDev
		, isClient
		, doCompileStyles
		, USES_TYPESCRIPT
		, extractText
		, doCopyFiles
		, copyConfig
		}
	);
}


export function buildPluginsRaw(requires:any, o:WPACK.OPTS,extensions:string[]){
	const 
		{ isProd
		, isDevServer
		, isServer
		, isDev
		, isClient
		, doCompileStyles
		, USES_TYPESCRIPT
		, extractText
		, doCopyFiles
		, copyConfig
		} = getPluginsPrep(o,extensions);

	addRequires(requires,'webpack','webpack');

	const str = '[\n'+
		[ `\tnew webpack.DefinePlugin(${JSON.stringify(o.globals,null,'\t\t\t').replace(/\}$/,'\t}')})`
		, isProd && 
			'new webpack.optimize.DedupePlugin()'
		, isProd && 
			'new webpack.optimize.OccurenceOrderPlugin(true)'
		, isDevServer && 
			'new webpack.NoErrorsPlugin()'
		, isDevServer && 
			'new webpack.HotModuleReplacementPlugin()'
		, isServer && isDev && 
			`new webpack.BannerPlugin( 'require("source-map-support").install();', { raw: true, entryOnly: false })`
		, isClient && isProd && 
			`new webpack.optimize.UglifyJsPlugin()`
		, doCompileStyles && addRequires(requires,'extract-text-webpack-plugins','ExtractTextPlugin') &&
			`new ExtractTextPlugin(${JSON.stringify(o.stylesDestination)},${JSON.stringify(extractText,null,'\t\t\t')})`
		, doCopyFiles && addRequires(requires,'copy-webpack-plugin','CopyWebpackPlugin') &&
			`new CopyWebpackPlugin([ JSON.stringify(copyConfig) ])`
		, USES_TYPESCRIPT && addRequires(requires,'awesome-typescript-loader','AwesomeTSLoader') &&
			`new AwesomeTSLoader.ForkCheckerPlugin()`
		].filter(Boolean).join(',\n\t')+'\n]';

	return str;

}

export default function buildPlugins(o:WPACK.OPTS,extensions:string[]){

	const 
		{ isProd
		, isDevServer
		, isServer
		, isDev
		, isClient
		, doCompileStyles
		, USES_TYPESCRIPT
		, extractText
		, doCopyFiles
		, copyConfig
		} = getPluginsPrep(o,extensions);

	return (
		[ new webpack.DefinePlugin(o.globals)
		, isProd && 
			new webpack.optimize.DedupePlugin()
		, isProd && 
			new webpack.optimize.OccurenceOrderPlugin(true)
		, isDevServer && 
			new webpack.NoErrorsPlugin()
		, isDevServer && 
			new webpack.HotModuleReplacementPlugin()

		, isServer && isDev && 
			new webpack.BannerPlugin
				( 'require("source-map-support").install();'
				, { raw: true, entryOnly: false }
				)
		, isClient && isProd && 
			new webpack.optimize.UglifyJsPlugin()
		, doCompileStyles &&
			new ExtractTextPlugin(o.stylesDestination,extractText)
		, doCopyFiles && 
			new CopyWebpackPlugin
				([ copyConfig ])
		, USES_TYPESCRIPT && 
			new ForkCheckerPlugin()
		].filter(Boolean)
	);
	
}