import {StorageKeys} from "$shared/lib/configuration";
import {TimeEntryDto} from "$shared/lib/models/TimeEntryDto";
import {UnwrappedEntryDateTime} from "$shared/lib/models/UnwrappedEntryDateTime";
import {Temporal} from "@js-temporal/polyfill";

export const EMAIL_REGEX = new RegExp(/^([a-z0-9]+(?:([._\-])[a-z0-9]+)*@(?:[a-z0-9]+(?:(-)[a-z0-9]+)?\.)+[a-z0-9](?:[a-z0-9]*[a-z0-9])?)$/i);
export const URL_REGEX = new RegExp(/^(http:\/\/www\.|https:\/\/www\.|http:\/\/|https:\/\/)?[a-z0-9]+([\-.][a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/gm);
export const GUID_REGEX = new RegExp(/^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/i);
export const NORWEGIAN_PHONE_NUMBER_REGEX = new RegExp(/(0047|\+47|47)?\d{8,12}/);

export function is_email(value: string): boolean {
    return EMAIL_REGEX.test(String(value).toLowerCase());
}

export function is_url(value: string): boolean {
    return URL_REGEX.test(String(value).toLowerCase());
}

export function is_norwegian_phone_number(value: string): boolean {
    if (value.length < 8 || value.length > 12) {
        return false;
    }
    return NORWEGIAN_PHONE_NUMBER_REGEX.test(String(value));
}

export function switch_theme() {
    const html = document.querySelector("html");
    if (html) {
        if (html.dataset.theme === "dark") {
            html.dataset.theme = "light";
        } else {
            html.dataset.theme = "dark";
        }
        localStorage.setItem(StorageKeys.theme, html.dataset.theme);
    }
}

export function unwrap_date_time_from_entry(entry: TimeEntryDto): UnwrappedEntryDateTime {
    if (!entry) throw new Error("entry was undefined");
    const currentTimeZone = Temporal.Now.timeZone().id;
    const startInstant = Temporal.Instant.from(entry.start).toZonedDateTimeISO(currentTimeZone);
    const stopInstant = Temporal.Instant.from(entry.stop).toZonedDateTimeISO(currentTimeZone);

    return {
        start_date: startInstant.toPlainDate(),
        stop_date: stopInstant.toPlainDate(),
        start_time: startInstant.toPlainTime(),
        stop_time: stopInstant.toPlainTime(),
        duration: Temporal.Duration.from({
            hours: stopInstant.hour,
            minutes: stopInstant.minute
        }).subtract(Temporal.Duration.from({
            hours: startInstant.hour,
            minutes: startInstant.minute
        }))
    };
}


export function is_guid(value: string): boolean {
    if (!value) {
        return false;
    }
    if (value[0] === "{") {
        value = value.substring(1, value.length - 1);
    }
    return GUID_REGEX.test(value);
}

export function is_empty_object(obj: object): boolean {
    return obj !== void 0 && Object.keys(obj).length > 0;
}

export function merge_obj_arr<T>(a: Array<T>, b: Array<T>, props: Array<string>): Array<T> {
    let start = 0;
    let merge = [];

    while (start < a.length) {

        if (a[start] === b[start]) {
            //pushing the merged objects into array
            merge.push({...a[start], ...b[start]});
        }
        //incrementing start value
        start = start + 1;
    }
    return merge;
}

export function set_favicon(url: string) {
    // Find the current favicon element
    const favicon = document.querySelector("link[rel=\"icon\"]") as HTMLLinkElement;
    if (favicon) {
        // Update the new link
        favicon.href = url;
    } else {
        // Create new `link`
        const link = document.createElement("link");
        link.rel = "icon";
        link.href = url;

        // Append to the `head` element
        document.head.appendChild(link);
    }
}

export function set_emoji_favicon(emoji: string) {
    // Create a canvas element
    const canvas = document.createElement("canvas");
    canvas.height = 64;
    canvas.width = 64;

    // Get the canvas context
    const context = canvas.getContext("2d") as CanvasRenderingContext2D;
    context.font = "64px serif";
    context.fillText(emoji, 0, 64);

    // Get the custom URL
    const url = canvas.toDataURL();

    // Update the favicon
    set_favicon(url);
}


// https://stackoverflow.com/a/48400665/11961742
export function seconds_to_hour_minute_string(seconds: number) {
    const hours = Math.floor(seconds / (60 * 60));
    seconds -= hours * (60 * 60);
    const minutes = Math.floor(seconds / 60);
    return hours + "h" + minutes + "m";
}

export function get_query_string(params: any = {}): string {
    const map = Object.keys(params).reduce((arr: Array<string>, key: string) => {
        if (params[key] !== undefined) {
            return arr.concat(`${key}=${encodeURIComponent(params[key])}`);
        }
        return arr;
    }, [] as any);

    if (map.length) {
        return `?${map.join("&")}`;
    }

    return "";
}

export function make_url(url: string, params: object): string {
    return `${url}${get_query_string(params)}`;
}

export function load_script(url: string) {
    unload_script(url, () => {
        return new Promise(function (resolve, reject) {
            const script = document.createElement("script");
            script.src = url;

            script.addEventListener("load", function () {
                // The script is loaded completely
                resolve(true);
            });

            document.body.appendChild(script);
        });
    });
}

export function unload_script(src: string, callback?: Function): void {
    document.querySelectorAll("script[src='" + src + "']").forEach(el => el.remove());
    if (typeof callback === "function") {
        callback();
    }
}

export function noop() {
}

export async function run_async(functionToRun: Function): Promise<any> {
    return new Promise((greatSuccess, graveFailure) => {
        try {
            greatSuccess(functionToRun());
        } catch (exception) {
            graveFailure(exception);
        }
    });
}

// https://stackoverflow.com/a/45215694/11961742
export function get_selected_options(domElement: HTMLSelectElement): Array<string> {
    const ret = [];

    // fast but not universally supported
    if (domElement.selectedOptions !== undefined) {
        for (let i = 0; i < domElement.selectedOptions.length; i++) {
            ret.push(domElement.selectedOptions[i].value);
        }

        // compatible, but can be painfully slow
    } else {
        for (let i = 0; i < domElement.options.length; i++) {
            if (domElement.options[i].selected) {
                ret.push(domElement.options[i].value);
            }
        }
    }
    return ret;
}

export function uuid_v4(): string {
    // @ts-ignore
    return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16));
}

export function random_string(length: number): string {
    if (!length) {
        throw new Error("length is undefined");
    }
    let result = "";
    const characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    const charactersLength = characters.length;
    for (let i = 0; i < length; i++) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}

interface CreateElementOptions {
    name: string,
    properties?: object,
    children?: Array<HTMLElement|Function|Node>
}

export function create_element_from_object(elementOptions: CreateElementOptions): HTMLElement {
    return create_element(elementOptions.name, elementOptions.properties, elementOptions.children);
}

export function create_element(name: string, properties?: object, children?: Array<HTMLElement|any>): HTMLElement {
    if (!name || name.length < 1) {
        throw new Error("name is required");
    }
    const node = document.createElement(name);
    if (properties) {
        for (const [key, value] of Object.entries(properties)) {
            // @ts-ignore
            node[key] = value;
        }
    }

    if (children && children.length > 0) {
        let actualChildren = children;
        if (typeof children === "function") {
            // @ts-ignore
            actualChildren = children();
        }
        for (const child of actualChildren) {
            node.appendChild(child as Node);
        }
    }
    return node;
}

export function get_element_position(element: HTMLElement|any) {
    if (!element) return {x: 0, y: 0};
    let x = 0;
    let y = 0;
    while (true) {
        x += element.offsetLeft;
        y += element.offsetTop;
        if (element.offsetParent === null) {
            break;
        }
        element = element.offsetParent;
    }
    return {x, y};
}

export function restrict_input_to_numbers(element: HTMLElement, specials: Array<string> = [], mergeSpecialsWithDefaults: boolean = false): void {
    if (element) {
        element.addEventListener("keydown", (e) => {
            const defaultSpecials = ["Backspace", "ArrowLeft", "ArrowRight", "Tab",];
            let keys = specials.length > 0 ? specials : defaultSpecials;
            if (mergeSpecialsWithDefaults && specials) {
                keys = [...specials, ...defaultSpecials];
            }
            if (keys.indexOf(e.key) !== -1) {
                return;
            }
            if (isNaN(parseInt(e.key))) {
                e.preventDefault();
            }
        });
    }
}

export function element_has_focus(element: HTMLElement): boolean {
    return element === document.activeElement;
}

export function move_focus(element: HTMLElement): void {
    if (!element) {
        element = document.getElementsByTagName("body")[0];
    }
    element.focus();
    // @ts-ignore
    if (!element_has_focus(element)) {
        element.setAttribute("tabindex", "-1");
        element.focus();
    }
}

export function get_url_parameter(name: string): string {
    // @ts-ignore
    return new RegExp("[?&]" + name + "=([^&#]*)")?.exec(window.location.href)[1];
}

export function update_url_parameter(param: string, newVal: string): void {
    let newAdditionalURL = "";
    let tempArray = location.href.split("?");
    const baseURL = tempArray[0];
    const additionalURL = tempArray[1];
    let temp = "";
    if (additionalURL) {
        tempArray = additionalURL.split("&");
        for (let i = 0; i < tempArray.length; i++) {
            if (tempArray[i].split("=")[0] !== param) {
                newAdditionalURL += temp + tempArray[i];
                temp = "&";
            }
        }
    }
    const rows_txt = temp + "" + param + "=" + newVal;
    const newUrl = baseURL + "?" + newAdditionalURL + rows_txt;
    window.history.replaceState("", "", newUrl);
}


export function get_style_string(rules: CSSRuleList) {
    let styleString = "";
    for (const [key, value] of Object.entries(rules)) {
        styleString += key + ":" + value + ";";
    }
    return styleString;
}

export function get_local_time_zone_date(date: Date): Date {
    const timeOffsetInMS = new Date().getTimezoneOffset() * 60000;
    date.setTime(date.getTime() - timeOffsetInMS);
    return date;
}

export function parse_iso_local(s: string) {
    const b = s.split(/\D/);
    //@ts-ignore
    return new Date(b[0], b[1] - 1, b[2], b[3], b[4], b[5]);
}

export function resolve_references(json: any) {
    if (!json) return;
    if (typeof json === "string") {
        json = JSON.parse(json ?? "{}");
    }
    const byid = {}, refs = [];
    json = function recurse(obj, prop, parent) {
        if (typeof obj !== "object" || !obj) {
            return obj;
        }
        if (Object.prototype.toString.call(obj) === "[object Array]") {
            for (let i = 0; i < obj.length; i++) {
                if (typeof obj[i] !== "object" || !obj[i]) {
                    continue;
                } else if ("$ref" in obj[i]) {
                    // @ts-ignore
                    obj[i] = recurse(obj[i], i, obj);
                } else {
                    obj[i] = recurse(obj[i], prop, obj);
                }
            }
            return obj;
        }
        if ("$ref" in obj) {
            let ref = obj.$ref;
            if (ref in byid) {
                // @ts-ignore
                return byid[ref];
            }
            refs.push([parent, prop, ref]);
            return;
        } else if ("$id" in obj) {
            let id = obj.$id;
            delete obj.$id;
            if ("$values" in obj) {
                obj = obj.$values.map(recurse);
            } else {
                for (let prop2 in obj) {
                    // @ts-ignore
                    obj[prop2] = recurse(obj[prop2], prop2, obj);
                }
            }
            // @ts-ignore
            byid[id] = obj;
        }
        return obj;
    }(json);
    for (let i = 0; i < refs.length; i++) {
        let ref = refs[i];
        // @ts-ignore
        ref[0][ref[1]] = byid[ref[2]];
    }
    return json;
}

export function to_readable_date_string(date: Date, locale = "nb-NO"): string {
    date.setMinutes(date.getMinutes() - date.getTimezoneOffset());
    return date.toLocaleString(locale);
}

export function get_random_int(min: number, max: number): number {
    min = Math.ceil(min);
    max = Math.floor(max);
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

export function to_readable_bytes(bytes: number): string {
    const s = ["bytes", "kB", "MB", "GB", "TB", "PB"];
    const e = Math.floor(Math.log(bytes) / Math.log(1024));
    return (bytes / Math.pow(1024, e)).toFixed(2) + " " + s[e];
}

export function can_use_dom(): boolean {
    return !!(typeof window !== "undefined" && window.document && window.document.createElement);
}

export function session_storage_remove_regex(regex: RegExp): void {
    let n = sessionStorage.length;
    while (n--) {
        const key = sessionStorage.key(n);
        if (key && regex.test(key)) {
            sessionStorage.removeItem(key);
        }
    }
}

export function local_storage_remove_regex(regex: RegExp): void {
    let n = localStorage.length;
    while (n--) {
        const key = localStorage.key(n);
        if (key && regex.test(key)) {
            localStorage.removeItem(key);
        }
    }
}

export function session_storage_set_json(key: string, value: object): void {
    sessionStorage.setItem(key, JSON.stringify(value));
}

export function session_storage_get_json(key: string): object {
    return JSON.parse(sessionStorage.getItem(key) ?? "{}");
}

export function local_storage_set_json(key: string, value: object): void {
    localStorage.setItem(key, JSON.stringify(value));
}

export function local_storage_get_json(key: string): object {
    return JSON.parse(localStorage.getItem(key) ?? "{}");
}

export function get_hash_code(value: string): number|undefined {
    let hash = 0;
    if (value.length === 0) {
        return;
    }
    for (let i = 0; i < value.length; i++) {
        const char = value.charCodeAt(i);
        hash = (hash << 5) - hash + char;
        hash |= 0;
    }
    return hash;
}

export function $(selector: string): HTMLElement|null {
    return document.querySelector(selector);
}

export function $$(selector: string): NodeListOf<Element> {
    return document.querySelectorAll(selector);
}