var fs = require('fs'),
    path = require('path'),
    filePath = path.join(__dirname, 'sie.si');

function parseInvoices(text){
    let verRe = /^#VER .+?\n\{\n(#TRANS \d{4} \{.*?\} .+?\n)*\}/mg;
    let accountRe = /^#KONTO .+$/mg;
    let objectRe = /^#OBJEKT .+$/mg;
    let transRe = /^#TRANS .+$/mg;
    let accountSplitRe = /^#KONTO (\d{4}) "?(.+)"?$/;
    let objectSplitRe = /^#OBJEKT (\d+) (\d+) "?(.+)"?$/;
    let transSplitRe = /^#TRANS (\d{4}) \{("\d+" )?("\d+" )?\} (.+)$/;
    let verSplitRe = /^#VER (.+) (.+) (.+) (.+)$/m;
    let stripOrBlank = (t) => t != null ? t.replace(/\"|\s/g,"") : "";

    let accounts = text.match(accountRe).map(c => {
        let accSplit = c.match(accountSplitRe);
        return {accountNr: accSplit[1], description: accSplit[2]};
    });

    let objects = text.match(objectRe).map(o => {
        let objSplit = o.match(objectSplitRe);
        return {dim: objSplit[1], id: objSplit[2], name: objSplit[3]};
    });

    let verifications = text.match(verRe).map(v => {
        let verSplit = v.match(verSplitRe);
        let ver = {series: verSplit[1], nr: verSplit[2], date: verSplit[3], text: verSplit[4].replace("\"", ""), trans: []};
        ver.trans = v.match(transRe).map(t => {
            let transSplit = t.match(transSplitRe);
            return {accountNr: transSplit[1], dim: stripOrBlank(transSplit[2]), obj: stripOrBlank(transSplit[3]), amount: transSplit[4] };
        });
        return ver;
    });

    return {
        objects: objects,
        accounts: accounts,
        verifications: verifications
    };
}

fs.readFile(filePath, {encoding: 'ascii'}, function(err,data){
    if (!err) {
        var invoices = parseInvoices(data);
        var jsonDocument = JSON.stringify(invoices).replace(/\\"/g,"");
        console.log(jsonDocument);
    } else {
        console.log(err);
    }
});