//Copyright Chris Xiong 2018
//License: Expat (MIT)
/* Returns all scanned posts in an array in the following format:
 * {
 *   file: String = file name of post (excluding the .txt extension)
 *   title: String = title extracted from the post
 *   date: String = post date extracted from the post (expected to be an ISO8601 full-date string, with optional post-status suffix)
 *   tags: String = comma-separated list of tags
 *   mdate: Number = source last modification time in msec since epoch
 *   needsupdate: boolean = true if post needs re-rendering
 * }
 */
module.exports={
	scan:function(s,d){return _scan(s,d);},
	build_list_index:function(){return _build_list_index();}
};
const fs=require('fs');
const path=require('path');
const util=require('./util');
const list=[];
const tags=[];
function _scan(s,dst)
{
	list.splice(0);
	d=fs.readdirSync(s).reverse();
	pdst=path.join(dst,'post');
	let poste=true;
	try{
		st=fs.statSync(pdst);
		if(!st.isDirectory)throw 'shit';
	}catch(e){poste=false;}
	for(let i of d)
		if(i.endsWith('.txt'))
		{
			const cont=fs.readFileSync(path.join(s,i),'utf8');
			contsplit=cont.split('\n');
			if(contsplit.length<4)continue;
			if(contsplit[1].indexOf('WIP')!=-1)continue;
			list.push({
				file:i.substring(0,i.length-4),
				title:contsplit[0].trim(),
				date:contsplit[1].trim(),
				tags:contsplit[2].trim(),
				mdate:fs.statSync(path.join(s,i)).mtimeMs,
				needsupdate:!util.mtime_cmp(path.join(s,i),path.join(pdst,i.substring(0,i.length-4)+'.html'))
			});

		}
	return list;
}
function _build_list_index()
{
	for(let i of list)
	{
		if (i.date.indexOf('UNLISTED') != -1) continue;
		for(let tg of i.tags.split(','))
		{
			if(!tags[tg])tags[tg]={posts:[],needsupdate:false};
			tags[tg].posts.push(i);
			tags[tg].needsupdate|=i.needsupdate;
		}
	}
	return tags;
}