import { LitElement, ReactiveController, ReactiveControllerHost, css, html, render } from "lit";
import { property } from "lit/decorators/property.js";

const terranMonthIntervals = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];

const pendorMonthIntervals = [
    0, 1, 25, 49, 73, 97, 121, 145, 146, 147, 171, 195, 211, 243, 267, 291, 292,
];

const pendorMonthNames = [
    "Yestar",
    "Narrin",
    "Nenim",
    "Sulim",
    "Virta",
    "Lothess",
    "Narnya",
    "Attendes",
    "Loende",
    "Cerim",
    "Urim",
    "Yavar",
    "Narquel",
    "Hiss",
    "Ring",
    "Mettare",
];

const centaurMonthIntervals = [0, 1, 43, 85, 145, 146, 147, 189, 249, 291, 292];

const centaurMonthNames = [
    "Yestr",
    "Tuil",
    "Layr",
    "Yaiv",
    "Attendes",
    "Loende",
    "Quel",
    "Rive",
    "Cair",
    "Mettare",
];

const pendorWeekdayNames = ["Seren", "Anar", "Noren", "Aldea", "Erwer", "Elenya"];

const prefix = (n: number) => `${n < 10 ? "0" : ""}${n.toFixed(0)}`;

export class ClockController implements ReactiveController {
    host: ReactiveControllerHost;

    value = new Date();
    timeout: number;
    // Node and the DOM do not agree on the type. Grrr.
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    private _timerID?: any;

    constructor(host: ReactiveControllerHost, timeout = 1000) {
        (this.host = host).addController(this);
        this.timeout = timeout;
    }

    hostConnected() {
        this._timerID = setInterval(() => {
            this.value = new Date();
            this.host.requestUpdate();
        }, this.timeout);
    }

    hostDisconnected() {
        clearInterval(this._timerID);
        this._timerID = undefined;
    }
}

const styles = css`
    *,
    *::before,
    *::after {
        all: unset;
        display: revert;
        box-sizing: border-box;
    }

    :host {
        padding-top: 0;
        letter-spacing: 1px;
        --default-font-size: calc(clamp(0.63rem, calc(0.5rem + 0.63vw), 0.9rem));
        font-family: Bitwise, Audiowide, Tahoma, Arial, Helvetica, sans-serif;
        flex: 0 1 auto;
        text-align: left;
    }

    div#clock {
        padding: 0.175rem 0.375rem 0.175rem 0.375rem;
        background-color: var(--pendorclock-background-color, #000030);
        color: var(--pendorclock-color, #ffffff);
        font-size: var(--pendorclock-font-size, --default-font-size);
        line-height: var(--pendorclock-line-height, 1.35);
        font-weight: var(--pendorclock-font-weight, 700);
        min-width: 20ch;
        max-width: 35ch;
        text-align: center;
    }
`;

const fontStyle = css`
    @font-face {
        font-family: "Audiowide";
        font-style: normal;
        font-weight: 400;
        font-display: swap;
        src: url(https://fonts.gstatic.com/s/audiowide/v20/l7gdbjpo0cum0ckerWCdlg_O.woff2)
            format("woff2");
        unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304,
            U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
            U+FEFF, U+FFFD;
    }
`;

export class PendorClock extends LitElement {
    static get styles() {
        return styles;
    }

    clock: ClockController;

    @property({ type: Boolean, attribute: "with-internal-font" })
    useInternalFont = false;

    @property({ type: Boolean, attribute: "centaurs" })
    useCentaurCalendar = false;

    constructor() {
        super();
        this.clock = new ClockController(this, 250);
    }

    connectedCallback() {
        super.connectedCallback();
        if (!this.useInternalFont) {
            return;
        }
        if (document.getElementById("pendor-font-block")) {
            return;
        }
        const head = document.head || document.getElementsByTagName("head")[0];
        const style = html`<style id="pendor-font-block" type="text/css">
            ${fontStyle}
        </style>`;
        render(style, head);
    }

    pendorDate(days: number) {
        const nextMonth = pendorMonthIntervals.findIndex((i) => i >= days);
        if (nextMonth === undefined || pendorMonthIntervals[nextMonth - 1] === undefined) {
            return undefined;
        }
        const thisMonth = nextMonth - 1;

        // Holidays!  Which have no Day-of-Week or Day-of-Month
        if ([0, 145, 146, 291].includes(days)) {
            return `${pendorMonthNames[thisMonth]}`;
        }

        const dayOfMonth = days - pendorMonthIntervals[thisMonth];
        const dayOfWeek = (Math.ceil(days) - 1) % 6;
        return `${pendorWeekdayNames[dayOfWeek]}, ${
            pendorMonthNames[thisMonth]
        } ${dayOfMonth.toFixed(0)}`;
    }

    centaurDate(days: number) {
        const nextMonth = centaurMonthIntervals.findIndex((i) => i >= days);
        if (nextMonth === undefined || centaurMonthIntervals[nextMonth - 1] === undefined) {
            return undefined;
        }
        const thisMonth = nextMonth - 1;

        // Holidays!  Which have no Day-of-Week or Day-of-Month
        if ([0, 145, 146, 291].includes(days)) {
            return `${centaurMonthNames[thisMonth]}`;
        }

        const dayOfMonth = days - centaurMonthIntervals[thisMonth];
        const dayOfWeek = (Math.ceil(days) - 1) % 6;
        return `${pendorWeekdayNames[dayOfWeek]}, ${
            centaurMonthNames[thisMonth]
        } ${dayOfMonth.toFixed(0)}`;
    }

    tick(now: Date) {
        let hours = terranMonthIntervals[now.getMonth()] + now.getDate();
        if (now.getMonth() > 2 && now.getFullYear() % 4 == 0) {
            hours++;
        }

        // DST Calculation, and wildly wrong, but WTF. It was prejudiced against where I live,
        // sorry.  I just liked watching the clock turnover at midnight every four days, when
        // Terra's and Pendor's clocks had the same midnight.

        hours = hours * 24 + now.getHours() - 16;

        // Canonically, Pendor was seeded in 1884 CE. This is just a convenience to get the dates
        // closer. This sixteen has nothing to do with the one above.
        const year = now.getFullYear() + 16;

        const days = hours / 30;
        hours = hours % 30;

        let seconds = (now.getSeconds() + now.getMinutes() * 60) / 2.25;
        const minutes = seconds / 40;
        seconds = seconds % 40;

        const timePart = `${hours.toFixed(0)}:${prefix(minutes)}:${prefix(seconds)}`;
        const daysPart = this.useCentaurCalendar ? this.centaurDate(days) : this.pendorDate(days);
        return `${daysPart}, 00${year.toFixed(0)}, ${timePart}`;
    }

    render() {
        return html`<div id="clock" part="clock">${this.tick(this.clock.value)}</div>`;
    }
}