import { pctEncChar, pctDecChars, unescapeComponent } from "../uri";
import punycode from "punycode";
import { merge, subexp, toUpperCase, toArray } from "../util";
const O = {};
const isIRI = true;
//RFC 3986
const UNRESERVED$$ = "[A-Za-z0-9\\-\\.\\_\\~" + (isIRI ? "\\xA0-\\u200D\\u2010-\\u2029\\u202F-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFEF" : "") + "]";
const HEXDIG$$ = "[0-9A-Fa-f]"; //case-insensitive
const PCT_ENCODED$ = subexp(subexp("%[EFef]" + HEXDIG$$ + "%" + HEXDIG$$ + HEXDIG$$ + "%" + HEXDIG$$ + HEXDIG$$) + "|" + subexp("%[89A-Fa-f]" + HEXDIG$$ + "%" + HEXDIG$$ + HEXDIG$$) + "|" + subexp("%" + HEXDIG$$ + HEXDIG$$)); //expanded
//RFC 5322, except these symbols as per RFC 6068: @ : / ? # [ ] & ; =
//const ATEXT$$ = "[A-Za-z0-9\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\_\\`\\{\\|\\}\\~]";
//const WSP$$ = "[\\x20\\x09]";
//const OBS_QTEXT$$ = "[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x7F]";  //(%d1-8 / %d11-12 / %d14-31 / %d127)
//const QTEXT$$ = merge("[\\x21\\x23-\\x5B\\x5D-\\x7E]", OBS_QTEXT$$);  //%d33 / %d35-91 / %d93-126 / obs-qtext
//const VCHAR$$ = "[\\x21-\\x7E]";
//const WSP$$ = "[\\x20\\x09]";
//const OBS_QP$ = subexp("\\\\" + merge("[\\x00\\x0D\\x0A]", OBS_QTEXT$$));  //%d0 / CR / LF / obs-qtext
//const FWS$ = subexp(subexp(WSP$$ + "*" + "\\x0D\\x0A") + "?" + WSP$$ + "+");
//const QUOTED_PAIR$ = subexp(subexp("\\\\" + subexp(VCHAR$$ + "|" + WSP$$)) + "|" + OBS_QP$);
//const QUOTED_STRING$ = subexp('\\"' + subexp(FWS$ + "?" + QCONTENT$) + "*" + FWS$ + "?" + '\\"');
const ATEXT$$ = "[A-Za-z0-9\\!\\$\\%\\'\\*\\+\\-\\^\\_\\`\\{\\|\\}\\~]";
const QTEXT$$ = "[\\!\\$\\%\\'\\(\\)\\*\\+\\,\\-\\.0-9\\<\\>A-Z\\x5E-\\x7E]";
const VCHAR$$ = merge(QTEXT$$, "[\\\"\\\\]");
const DOT_ATOM_TEXT$ = subexp(ATEXT$$ + "+" + subexp("\\." + ATEXT$$ + "+") + "*");
const QUOTED_PAIR$ = subexp("\\\\" + VCHAR$$);
const QCONTENT$ = subexp(QTEXT$$ + "|" + QUOTED_PAIR$);
const QUOTED_STRING$ = subexp('\\"' + QCONTENT$ + "*" + '\\"');
//RFC 6068
const DTEXT_NO_OBS$$ = "[\\x21-\\x5A\\x5E-\\x7E]"; //%d33-90 / %d94-126
const SOME_DELIMS$$ = "[\\!\\$\\'\\(\\)\\*\\+\\,\\;\\:\\@]";
const QCHAR$ = subexp(UNRESERVED$$ + "|" + PCT_ENCODED$ + "|" + SOME_DELIMS$$);
const DOMAIN$ = subexp(DOT_ATOM_TEXT$ + "|" + "\\[" + DTEXT_NO_OBS$$ + "*" + "\\]");
const LOCAL_PART$ = subexp(DOT_ATOM_TEXT$ + "|" + QUOTED_STRING$);
const ADDR_SPEC$ = subexp(LOCAL_PART$ + "\\@" + DOMAIN$);
const TO$ = subexp(ADDR_SPEC$ + subexp("\\," + ADDR_SPEC$) + "*");
const HFNAME$ = subexp(QCHAR$ + "*");
const HFVALUE$ = HFNAME$;
const HFIELD$ = subexp(HFNAME$ + "\\=" + HFVALUE$);
const HFIELDS2$ = subexp(HFIELD$ + subexp("\\&" + HFIELD$) + "*");
const HFIELDS$ = subexp("\\?" + HFIELDS2$);
const MAILTO_URI = new RegExp("^mailto\\:" + TO$ + "?" + HFIELDS$ + "?$");
const UNRESERVED = new RegExp(UNRESERVED$$, "g");
const PCT_ENCODED = new RegExp(PCT_ENCODED$, "g");
const NOT_LOCAL_PART = new RegExp(merge("[^]", ATEXT$$, "[\\.]", '[\\"]', VCHAR$$), "g");
const NOT_DOMAIN = new RegExp(merge("[^]", ATEXT$$, "[\\.]", "[\\[]", DTEXT_NO_OBS$$, "[\\]]"), "g");
const NOT_HFNAME = new RegExp(merge("[^]", UNRESERVED$$, SOME_DELIMS$$), "g");
const NOT_HFVALUE = NOT_HFNAME;
const TO = new RegExp("^" + TO$ + "$");
const HFIELDS = new RegExp("^" + HFIELDS2$ + "$");
function decodeUnreserved(str) {
    const decStr = pctDecChars(str);
    return (!decStr.match(UNRESERVED) ? str : decStr);
}
export default {
    scheme: "mailto",
    parse: function (components, options) {
        const to = components.to = (components.path ? components.path.split(",") : []);
        components.path = undefined;
        if (components.query) {
            let unknownHeaders = false;
            const headers = {};
            const hfields = components.query.split("&");
            for (let x = 0, xl = hfields.length; x < xl; ++x) {
                const hfield = hfields[x].split("=");
                switch (hfield[0]) {
                    case "to":
                        const toAddrs = hfield[1].split(",");
                        for (let x = 0, xl = toAddrs.length; x < xl; ++x) {
                            to.push(toAddrs[x]);
                        }
                        break;
                    case "subject":
                        components.subject = unescapeComponent(hfield[1], options);
                        break;
                    case "body":
                        components.body = unescapeComponent(hfield[1], options);
                        break;
                    default:
                        unknownHeaders = true;
                        headers[unescapeComponent(hfield[0], options)] = unescapeComponent(hfield[1], options);
                        break;
                }
            }
            if (unknownHeaders)
                components.headers = headers;
        }
        components.query = undefined;
        for (let x = 0, xl = to.length; x < xl; ++x) {
            const addr = to[x].split("@");
            addr[0] = unescapeComponent(addr[0]);
            if (!options.unicodeSupport) {
                //convert Unicode IDN -> ASCII IDN
                try {
                    addr[1] = punycode.toASCII(unescapeComponent(addr[1], options).toLowerCase());
                }
                catch (e) {
                    components.error = components.error || "Email address's domain name can not be converted to ASCII via punycode: " + e;
                }
            }
            else {
                addr[1] = unescapeComponent(addr[1], options).toLowerCase();
            }
            to[x] = addr.join("@");
        }
        return components;
    },
    serialize: function (components, options) {
        const to = toArray(components.to);
        if (to) {
            for (let x = 0, xl = to.length; x < xl; ++x) {
                const toAddr = String(to[x]);
                const atIdx = toAddr.lastIndexOf("@");
                const localPart = (toAddr.slice(0, atIdx)).replace(PCT_ENCODED, decodeUnreserved).replace(PCT_ENCODED, toUpperCase).replace(NOT_LOCAL_PART, pctEncChar);
                let domain = toAddr.slice(atIdx + 1);
                //convert IDN via punycode
                try {
                    domain = (!options.iri ? punycode.toASCII(unescapeComponent(domain, options).toLowerCase()) : punycode.toUnicode(domain));
                }
                catch (e) {
                    components.error = components.error || "Email address's domain name can not be converted to " + (!options.iri ? "ASCII" : "Unicode") + " via punycode: " + e;
                }
                to[x] = localPart + "@" + domain;
            }
            components.path = to.join(",");
        }
        const headers = components.headers = components.headers || {};
        if (components.subject)
            headers["subject"] = components.subject;
        if (components.body)
            headers["body"] = components.body;
        const fields = [];
        for (const name in headers) {
            if (headers[name] !== O[name]) {
                fields.push(name.replace(PCT_ENCODED, decodeUnreserved).replace(PCT_ENCODED, toUpperCase).replace(NOT_HFNAME, pctEncChar) +
                    "=" +
                    headers[name].replace(PCT_ENCODED, decodeUnreserved).replace(PCT_ENCODED, toUpperCase).replace(NOT_HFVALUE, pctEncChar));
            }
        }
        if (fields.length) {
            components.query = fields.join("&");
        }
        return components;
    }
};
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