"use strict";

const cl = global.botanLoader;
const Dragonfly = global.Dragonfly;

const doT = require("dot");

const Chain = require( "./chain" );

var VFlow = function( controller )
{
	var _self = this;

	return function( so, ro )
	{
		Dragonfly.Debug( "Using Flow: Chain" );
		// Retain the scope of caller
		_self.scope = this;
		_self.chains = new Chain( _self.Render.bind( _self ) );
		_self.chains.onError = _self.onError.bind( _self );
		_self.init( so, ro );

		new controller( _self, _self.viewData );
	};
};

VFlow.prototype.endFlow = function( layout, ext )
{
	var _self = this;
	var viewData = this.viewData;
	var options = viewData.templating || {};

	// Layout Chain: Two Column
	var twoColHandle = function( def, data, _class )
	{
		var view = doT.template( data, options[ _class ], def );
		viewData.context = view( viewData );

		ElemHandle();
	};

	// Element Header / Footer
	var ElemHandle = function ()
	{
		_self.chains.HFC( viewData, viewData, HCFHandle );
	};

	// Layout Chain: Header - Content - Footer
	var HCFHandle = function ()
	{
		_self.chains.Template( "Layout.HCF", BackboneHandle );
	};

	// Html Backbone
	var BackboneHandle = function ( def, data, _class )
	{
		if( data )
		{
			var view = doT.template( data, options[ _class ], def );
			viewData.body = view( viewData );
		}

		var jc = _self.chains.Multi(
			"BotanJs"
			, () => _self.chains.Template( "Layout.HTML", FinalHandle )
		, 2 );

		viewData.modules.addListener( "error", function( e, b )
		{
			throw new Error( e + "\n" + b );
		} );
		viewData.modules.addListener( "complete", jc );

		viewData.modules.compile( "js" );
		viewData.modules.compile( "css" );
	};

	var FinalHandle = function( def, data, _class )
	{
		var view = doT.template( data, options[ _class ], def );
		viewData[ "_process_time" ] = () => _self.scope.ProcessTime;
		_self.Render( view( viewData ) );
	};

	if( layout === undefined ) layout = "Elem";

	var chainLayouts = (
		({ // Defined layout chains
			"TwoCol": function()
			{
				viewData.modules.push( "Astro.Starfall.Layout.TwoColumn" );
				_self.chains.Template( "Layout.TwoColumn", twoColHandle ); 
			}
			, "PureCol": function()
			{
				viewData.modules.push( "Astro.Starfall.Layout.PureColumn" );
				_self.chains.Template( "Layout.PureColumn", BackboneHandle );
			}
			, "Elem": ElemHandle
			, "Backbone": BackboneHandle
		}) [ layout ]
		// Fallback to try out undefined template chains
		|| function() { _self.chains.Template( layout, FinalHandle, ext ); }
	)();
};

VFlow.prototype.init = function( so, ro )
{
	this.so = so;
	this.routeObj = ro;
	this.viewData = {};
};

VFlow.prototype.onError = function( err )
{
	if( err )
	{
		Dragonfly.Error( err );
		this.routeObj.reRoute( "500", true );
	}
	return err;
};

VFlow.prototype.Render = function( r )
{
	Dragonfly.Info( "Render" );
	this.scope.result = r;
	this.scope.plantResult( this.useCache, this.cacheTime );
};

VFlow.create = function( c )
{
	// Proxy the controller
	//    Do not use arrow function
	//    Because the scope will be binded here
	//    We don't wanna do that
	return function( a, b )
	{
		var cf = new VFlow( c );
		return cf.bind( this )( a, b );
	};
};

module.exports = VFlow;