(function () {
"use strict";
const FACS = new Set();
const DEPTS = new Map();
// maintain: CDM Advanced Search,
// console.log(Array.prototype.map.call(document.getElementsByName("subjectPopup")[0].children,(e)=>'"'+e.textContent.match(/[A-Z]{2,4}/)[0] + '"').join(", "))
[
    ["AP", "ADMB", "ADMS", "ANTH", "ARB", "ASL", "CCY", "CDNS", "CH", "CLST", "CLTR", "COGS", "COMN", "CRIM", "DEMS", "DLLL", "ECON", "EN", "ESL", "FND", "FR", "GCIN", "GEOG", "GER", "GK", "GKM", "GWST", "HEB", "HIST", "HREQ", "HRM", "HUMA", "INDG", "INDV", "IT", "ITEC", "JC", "JP", "KOR", "LA", "LASO", "LING", "LLS", "MIST", "MODR", "PERS", "PHIL", "POLS", "POR", "PPAS", "PRWR", "RU", "SOCI", "SOSC", "SOWK", "SP", "SWAH", "SXST", "TESL", "TYP", "WKLS", "WRIT"],
    ["ED", "AUCO", "BBED", "BIOL", "CHEM", "DANC", "DEST", "DRAA", "ECON", "EDFE", "EDFR", "EDIN", "EDIS", "EDJI", "EDPJ", "EDPR", "EDST", "EDUC", "EN", "ENVS", "FAST", "FREN", "GEOG", "HEB", "HIST", "INDS", "LAW", "LLDV", "MATH", "MUSI", "ORCO", "PHED", "PHIL", "PHYS", "POLS", "PRAC", "SCIE", "SLGS", "SOSC", "TECH", "TLSE", "VISA"],
    ["ES", "ENVS"],
    ["FA", "ARTH", "DANC", "DATT", "DESN", "FACS", "FILM", "INDV", "MUSI", "PANF", "THEA", "VISA", "YSDN"],
    ["GL", "BIOL", "BUEC", "CAT", "CDNS", "COMS", "CSLA", "DRST", "ECON", "EN", "ENSL", "FRAN", "FSL", "GWST", "HIST", "HUMA", "ILST", "ITEC", "LIN", "LYON", "MATH", "MODR", "NATS", "PHIL", "PHYS", "POLS", "PSYC", "SOCI", "SOSC", "SP", "SXST", "TRAN", "WKST", "WMST"],
    ["GS", "ANTH", "ARTH", "BIOL", "BLIS", "CDIS", "CGTA", "CHEM", "CIVL", "CMCT", "DANC", "DEMS", "DIGM", "DVST", "ECON", "EDUC", "EECS", "EIL", "EN", "ENG", "ENVS", "ESS", "FACC", "FILM", "FREN", "GEOG", "GFWS", "HIST", "HLTH", "HRM", "HUMA", "INST", "INTE", "ITEC", "KAHS", "LAL", "LAW", "LREL", "MATH", "MDES", "MECH", "MUSI", "NURS", "OVGS", "PACC", "PHIL", "PHYS", "PIA", "POLS", "PPAL", "PSYC", "SLST", "SOCI", "SOWK", "SPTH", "STS", "THEA", "THST", "TRAN", "TRAS", "TXLW", "VISA", "WMST"],
    ["HH", "HLST", "IHST", "KINE", "NURS", "PKIN", "PSYC"],
    ["LE", "CIVL", "COOP", "EECS", "ENG", "ESSE", "MECH"],
    ["SB", "ACTG", "ARTM", "BSUS", "DCAD", "ECON", "EMBA", "ENTR", "EXCH", "FINE", "FNEN", "FNSV", "HIMP", "IBUS", "MBA", "INTL", "MACC", "MBAN", "MFIN", "MGMT", "MINE", "MKTG", "MSTM", "OMIS", "ORGS", "OVGS", "PLCY", "PROP", "PUBL", "SGMT", "SOCM"],
    ["SC", "BC", "BCHM", "BIOL", "BPHS", "CHEM", "COOP", "ENVB", "GEOG", "ISCI", "MATH", "NATS", "PHYS", "SENE", "STS"]
].forEach((arr) => {
    let faculty = arr.shift();
    FACS.add(faculty);
    arr.forEach((subj) => DEPTS.set(subj, faculty));
});

const TOKEN_DELIM_RE = /[^A-Za-z0-9.=]/;
const CRSN_RE = /^[0-9]{4}$/;
const DEPTCRSN_RE = /^([A-Z]{2,4})([0-9]{4})$/;
const CRED_RE = /^(?:Cr=([0-9]{1,2}(?:\.[0-9]{0,2})?)|([0-9]{1,2}\.[0-9]{0,2}))$/;
const MAYBE_CRED_RE = /^[0-9]{1,2}$/;
const MAYBE_DEPT_RE = /^[A-Z]{2,4}$/;
const IGNORE_RE = /^[A-Z]$/;

let ycq_storage = JSON.parse(localStorage.ycq || "{}");
if (!ycq_storage)
    ycq_storage = {};
ycq_storage.course_creds = ycq_storage.course_creds || {};
ycq_storage.course_subjs = ycq_storage.course_subjs || {};

let now = new Date();
let month = now.getMonth();
// change to next summer on new year
// begin next FW on July 1
let fw_year, s_year;
if (month >= 6) {
    fw_year = now.getFullYear();
} else {
    fw_year = now.getFullYear() - 1;
}
s_year = now.getFullYear();
let fw_sess = document.createElement("option");
let fw_sess_val = "FW " + fw_year;
fw_sess.value = fw_sess_val;
fw_sess.textContent = `Fall/Winter ${fw_year}-${fw_year+1}`;
let s_sess = document.createElement("option");
let s_sess_val = "SU " + (s_year - 1);
s_sess.value = s_sess_val;
s_sess.textContent = `Summer ${s_year}`;
switch (ycq_storage.sess) {
    case fw_sess_val: fw_sess.selected = true; break;
    case s_sess_val: s_sess.selected = true; break;
    default:
        /* assume enrolling for summer courses between March and May inclusive */
        if (month >= 2 && month <= 4)
            s_sess.selected = true;
        else
            fw_sess.selected = true;
}

let ENGLISH_TYPES = {"fac": "faculty", "subj": "subject/subject", "crsn": "course number", "cred": "credit number", "sess": "session (pick on the right)"};

function ready() {
    let ywhAd = document.getElementById("ywh-ad");
    if (location.protocol != "http:" && location.protocol != "https:" && location.protocol != "file:") {
        ywhAd.style.display = "none";
    }

    let sessions = document.querySelector("#sessions");
    sessions.appendChild(fw_sess);
    sessions.appendChild(s_sess);

    let input = document.getElementById("input");
    let link = document.getElementById("link");
    let linkContainer = document.getElementById("link-container");

    let state;

    let apply = function () {
        state = {subj: "", fac: "", crsn: "", cred: ""};
        let multiple = new Set();
        let warn = [], error = [];

        let got = function (type, token) {
            if (state[type])
                multiple.add(ENGLISH_TYPES[type]);
            state[type] = token;
        };

        let tryParse = function (token) {
            let subjcrsn, cred;
            if (DEPTS.has(token)) {
                got("subj", token);
            } else if (FACS.has(token)) {
                got("fac", token);
            } else if ((subjcrsn = DEPTCRSN_RE.exec(token))) {
                got("subj", subjcrsn[1]);
                got("crsn", subjcrsn[2]);
            } else if ((cred = CRED_RE.exec(token))) {
                got("cred", parseFloat(cred[1] || cred[2]).toFixed(2));
            } else if (CRSN_RE.test(token)) {
                got("crsn", token);
            } else if (MAYBE_CRED_RE.test(token)) {
                got("cred", parseFloat(token).toFixed(2));
                warn.push(`assuming ${token} is the number of credits`);
            } else if (MAYBE_DEPT_RE.test(token)) {
                state.maybeSubj = token;
            } else if (!IGNORE_RE.test(token)) {
                return false;
            }
            return true;
        };

        input.value.split(TOKEN_DELIM_RE).forEach(function (token) {
            if (!token || tryParse(token) || tryParse(token.toUpperCase()))
                return;
            warn.push("don't understand search term: " + token);
        });

        if (!state.subj && state.maybeSubj) {
            state.subj = state.maybeSubj;
            warn.push("guessing subject is " + state.maybeSubj);
        }

        if (!state.subj && ycq_storage.course_subjs[state.crsn]) {
            state.subj = ycq_storage.course_subjs[state.crsn];
            warn.push(`using saved subject for ${state.crsn}: ${state.subj}`);
        }

        if (!state.fac && state.subj) {
            state.fac = DEPTS.get(state.subj);
            if (!state.fac)
                error.push("no faculty provided and unknown subject");
        }

        if (state.subj && state.crsn && !state.cred) {
            if (ycq_storage.course_creds[state.subj + state.crsn]) {
                state.cred = ycq_storage.course_creds[state.crsn];
                warn.push(`using saved credit number for ${state.subj} ${state.crsn}: ${state.cred}`);
            } else {
                state.cred = "3.00";
                warn.push("assuming the number of credits is 3.00");
            }
        }

        let r_sess = document.getElementById("sessions").value;
        let sess = r_sess.split(" ");
        state.sess = sess[0];
        state.year = parseInt(sess[1], 10);

        if (state.fac && state.subj && state.crsn && state.cred && state.year && state.sess) {
            link.href = `https://w2prod.sis.yorku.ca/Apps/WebObjects/cdm.woa/wa/crsq?fa=${state.fac}&sj=${state.subj}&cn=${state.crsn}&cr=${state.cred}&ay=${state.year}&ss=${state.sess}`;
            link.textContent = `York University: ${state.fac}/${state.subj} ${state.crsn} ${state.cred} (${sessions.selectedOptions[0].textContent})`;
            linkContainer.style.display = "block";
        } else if (state.fac && state.subj && state.sess) {
            link.href = `https://w2prod.sis.yorku.ca/Apps/WebObjects/cdm.woa/wa/crsq1?faculty=${state.fac}&subject=${state.subj}&academicyear=${state.year}&studysession=${state.sess}`;
            link.textContent = `York University: ${state.fac}/${state.subj} Courses (${sessions.selectedOptions[0].   textContent})`;
            linkContainer.style.display = "block";
        } else {
            linkContainer.style.display = "none";
            error.push("insufficient search parameters. need at least subject. see examples above");
        }

        if (multiple.size)
            warn.push("multiple terms for " + Array.from(multiple.values()).join(", ") + ", using last occurrence for each");

        document.getElementById("warning").innerHTML = warn.map(w => 'warning: ' + w).join("<br>");
        document.getElementById("error").innerHTML = error.map(e => 'error: ' + e).join("<br>");

        ycq_storage.sess = r_sess;
        localStorage.ycq = JSON.stringify(ycq_storage);
    };

    input.addEventListener("input", apply);
    sessions.addEventListener("change", apply);
    document.getElementById("sample-queries").addEventListener("click", function (e) {
        if (e.target.tagName == "A") {
            e.preventDefault();
            input.select();
            // doesn't work in Firefox, oh well
            if (!document.execCommand || !document.execCommand("insertText", false, e.target.textContent))
                input.value = e.target.textContent;
            apply();
            input.focus();
        }
    });
    let save_crsn = function () {
        let modified = false;
        if (state.crsn) {
            if (state.subj && state.cred) {
                ycq_storage.course_creds[state.subj + state.crsn] = state.cred;
                modified = true;
            }
            if (state.subj) {
                ycq_storage.course_subjs[state.crsn] = state.subj;
                modified = true;
            }
        }
        if (modified)
            localStorage.ycq = JSON.stringify(ycq_storage);
    };
    link.addEventListener("click", save_crsn);
    document.forms[0].addEventListener("submit", function (e) {
        e.preventDefault();
        if (linkContainer.style.display == "block")
            link.click();
    });
    input.addEventListener("keydown", function (e) {
        if (e.key == "Enter") {
            e.preventDefault();
            if (linkContainer.style.display == "block") {
                // firefox silently ignores simulated link events with modifiers
                if (/(?:Firefox|Gecko)\//.test(navigator.userAgent) && (e.ctrlKey || e.shiftKey || e.altKey || e.metaKey)) {
                    if (e.ctrlKey) {
                        link.target = "_blank";
                        link.click();
                        link.target = "";
                    } else if (e.shiftKey) {
                        // only need save_crsn here because other methods already trigger the link click event
                        save_crsn();
                        window.open(link.href, "_blank",
                            "noopener,width=625,resizable,menubar,toolbar,location,personalbar,status,scrollbars");
                    } else {
                        link.click();
                    }
                } else {
                    link.dispatchEvent(new MouseEvent("click", e));
                }
            }
        }
    });
    apply();
}

if (document.readyState === "interactive" || document.readyState === "complete") {
    ready();
} else {
    document.addEventListener("DOMContentLoaded", ready);
}
}());