'use strict';

const RDESCRIPTION = /^([\s\S]*?)(?=@|$)/g;
const RPARAM = /^@param(?:[ \t]+(\w+))(?:[ \t]+\{(.*?)\})?(?:[ \t]+(.*?))?$/gm;
const RRETURNS = /^@returns(?:[ \t]+\{(.*?)\})?(?:[ \t]+(.*?))?$/gm;
const REXAMPLE = /@example\n(```[\s\S]*?\n```\n|(?:(?: {4}|\t).*?\n)+)?/g;
function undecorate(txt) {
    txt = txt.replace(/^\s*\/\*\*|\*\/\s*$/g, "");
    txt = txt.replace(/^[ \t]*\*[ \t]*|[ \t*]$/gm, "");
    return txt.trim();
}
function decorate(txt) {
    var txt = txt.trim();
    if (!txt.includes("\n"))
        return `/** ${txt} */`;
    var txt = txt.split("\n").map(l => " * " + l.trim()).join("\n");
    return `/**\n${txt}\n */`;
}
function parse(txt) {
    var full = txt;
    var txt = undecorate(txt), m = null;
    var description = "", params = [];
    var returns = null, examples = [];
    while ((m = RDESCRIPTION.exec(txt)) != null)
        description = m[1] || "";
    while ((m = RPARAM.exec(txt)) != null)
        params.push({ full: m[0], name: m[1], type: m[2] || "", description: m[3] || "" });
    while ((m = RRETURNS.exec(txt)) != null)
        returns = { full: m[0], type: m[1] || "", description: m[2] || "" };
    while ((m = REXAMPLE.exec(txt)) != null)
        if (m[1])
            examples.push(m[1]);
    return { full, description, params, returns, examples };
}
function stringify(x) {
    var txt = x.description.trim() + "\n";
    for (var p of x.params)
        txt += ("@param" + ` ${p.name}` + (p.type ? ` {${p.type}}` : "") + ` ${p.description}`).trim() + "\n";
    for (var r of x.returns ? [x.returns] : [])
        txt += ("@returns" + (r.type ? ` {${r.type}}` : "") + ` ${r.description}`).trim() + "\n";
    for (var e of x.examples)
        txt += `@example\n${e.trim()}\n`;
    return decorate(txt);
}

exports.parse = parse;
exports.stringify = stringify;