'use strict';

var name = 'node-ff-assets';
var downloadTimeout  = (1000*10)   * 6;  // 1min
var downloadMaxSize  = (1024*1024) * 10; // 10mb

var template = {
	downloadStartDelay: null,
	downloadForce: false,
	downloadOptions: {
		timeout: downloadTimeout,
		maxResponseLength: downloadMaxSize,
		agent: name+' remote fetcher',
	},
	
	linkTargetSingleResult: true,
	linkTarget: null,
	linkSources: [],
	linkMapping: [],
	
	assetType: null,
	assetHeader: '\n/* '+name+': begin */\n\n',
	assetFooter: '\n/* '+name+': end */\n\n',
	assetSeperator: '\n/* '+name+': next */\n',
};

function checkConfig(config,callback) {
	if (!config) {
		callback(new Error('no config'));
	}
	if (!config.linkTarget) {
		callback(new Error('no config.linkTarget'));
	}
	if (!config.linkSources) {
		callback(new Error('no config.linkSources'));
	}
	if (!config.linkMapping) {
		callback(new Error('no config.linkMapping'));
	}
	callback();
}

function fillDefaults(config,callback) {
	if (config.downloadOptions === undefined) {
		config.downloadOptions = template.downloadOptions;
	}
	if (config.assetHeader === undefined) {
		config.assetHeader = template.assetHeader;
	}
	if (config.assetFooter === undefined) {
		config.assetFooter = template.assetFooter;
	}
	if (config.assetSeperator === undefined) {
		config.assetSeperator = template.assetSeperator;
	}
	if (config.linkTargetSingleResult === undefined) {
		config.linkTargetSingleResult = template.linkTargetSingleResult;
	}
	if (config.downloadForce === undefined) {
		config.downloadForce = template.downloadForce;
	}
	callback(null,config);
}

module.exports = {
	template: template,
	checkConfig: checkConfig,
	fillDefaults: fillDefaults,
};