const path = require( 'path' );
const config = require( '../tribes/townconf.js' );

const checkHeaders = ( req, res, next ) => {
	/**
	 * @apiDefine apxHeader
	 * @apiGroup Middleware
	 * @apiDescription Header is mandatory to access apxtrib see tribes/townconf.json.exposedHeaders
	 * A turn around can be done with a simple get params has to be sent in the get url. Usefull to send simple get without header like ?xworkon=tribeName&xlang=en... priority is given to headers
	 * For performance, tokens are store globaly in req.app.locals.tokens={xpaganid:xauth}
	 * if xlang is not in config.languagesAvailable
	 * 
	 * @apiHeader {string} xauth Pagans unique jwt token store in local town Pagans data or "noauth" 
	 * @apiHeader {string} xpaganid Pagans unique Pagan id in uuid format or "nouuid"
	 * @apiHeader {string} xlang the 2 letter langage it request the api (if not exist the 2 first letter of Accept-Language header ) if lang does not exist in the town then en is set (as it always exist in en).
	 * @apiHeader {string} xtribe Tribes id where Pagan belong to
	 * @apiHeader {string} xworkon Tribes on which pagansId want and have accessright to work on.
	 * @apiHeader {string} xapp Name of app that send the request (tribesId:websiteName) cpaganid have to have accessright on this app}
	 * 
	 * @apiError missingexposedHeaders it miss an exposedHeaders
	 * 
	 * @apiErrorExample {json} Error-Response:
	 * 	HTTP/1/1 404 Not Found
	 * 		{
	 * 			status:404,
	 * 			info:"|middleware|missingheaders",
	 *          moreinfo: xpaganid xauth
	 *      }
	 * 
	 * @apiHeaderExample {json} Header-Exemple:
	 *     {
	 * 			xtribe:"apache",
	 *          xpaganid:"12123211222",
	 *          xworkon:"sioux",
	 *          xauth:"",
	 *          xlang:"en",
	 *          xapp:""
	 * 		}
	 */
	req.session = {};
	const header = {};
	if (!req.header('xlang') && req.header('Content-Language')) req.params.xlang=req.header('Content-Language');
	let missingheader = [];
	for( const h of config.exposedHeaders ) {
		//console.log( h, req.header( h ) )
		if( req.params[ h ] ) {
			header[ h ] = req.params[ h ]
		} else if( req.header( h ) ) {
			header[ h ] = req.header( h )
		} else {
			missingheade.push(h);
		}
	};
	//console.log( 'header', header )
	// store in session the header information
	req.session.header = header;
	// Each header have to be declared
	if( missingheader != "" ) {
		// bad request
		return res.status( 400 )
			.json( {
				ref:"headers"
				info: "missingheader",
				moreinfo: missingheader
			} );
	};
	//console.log( req.app.locals.tribeids )
	if( !req.app.locals.tribeids.includes( header.xtribe ) ) {
		return res.status( 400 )
			.json( {
				ref:"headers"
				info: 'tribeiddoesnotexist',
				moreinfo: header.xtribe
			} );
	}
	if( !req.app.locals.tribeids.includes( header.xworkon ) ) {
		return res.status( 400 )
			.send( {
				info: [ 'workondoesnotexist' ],
				ref: 'headers',
				moreinfo:header.xworkon
			} );
	}
	if( !config.languages.includes( header.xlang ) ) {
		header.xlang="en";
	}
	next();
};
module.exports = checkHeaders;