const ID_SIZE = 24;
const URLSafeCharacters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.~';

export function unifySlug(slug: string | string[]): string
{
    return (Array.isArray(slug) ? slug.join('/') : slug);
}
export function getID()
{
    for (var id = [], i = 0; i < ID_SIZE; i++)
        id.push(URLSafeCharacters[URLSafeCharacters.length * Math.random() | 0]);
    return id.join("");
}
export function encodeBase(value: string): string
{
    if(value === '')
        return '';

    const buffer = Buffer.from(value, 'utf8'), base = BigInt(URLSafeCharacters.length);
    let nb = BigInt('0x' + buffer.toHex()), result = [];

    while(nb > 0)
    {
        const remaining = nb % base;
        result.push(URLSafeCharacters[Number(remaining)]);
        nb = (nb - remaining) / base;
    }

    const text = result.reverse().join('');
    return text;
}
export function decodeBase(value: string): string
{
    if(value === '')
        return '';

    const result = '', base = BigInt(URLSafeCharacters.length);
    let nb = BigInt(0);
    value.split('').forEach(e => nb = nb * base + BigInt(URLSafeCharacters.indexOf(e)));

    const text = Buffer.from(nb.toString(16), 'hex').toString('utf8');
    return text;
}
export function group<
  T,
  K extends keyof T,
  V extends keyof T,
  KeyType extends string | number | symbol = Extract<T[K], string | number | symbol>
>(
  table: T[],
  key: K & (T[K] extends string | number | symbol ? K : never),
  value: V
): Record<KeyType, T[V]> {
  return table.reduce((p, v) => {
    p[v[key] as KeyType] = v[value];
    return p;
  }, {} as Record<KeyType, T[V]>);
}
export function parsePath(path: string): string
{
    return path.replace(/(\d+?)\. ?/g, '').toLowerCase().replaceAll(" ", "-").normalize("NFD").replaceAll(/[\u0300-\u036f]/g, "").replaceAll('(', '').replaceAll(')', '').replace(/\-+/g, '-');
}
export function parseId(id: string | undefined): string | undefined
{
    return id;
    //return id?.normalize('NFD')?.replace(/[\u0300-\u036f]/g, '')?.replace(/^\d\. */g, '')?.replace(/\s/g, "-")?.replace(/%/g, "-percent")?.replace(/\?/g, "-q")?.toLowerCase();
}
export function padLeft(text: string, pad: string, length: number): string
{
    return text.concat(pad.repeat(length - text.length));
}
export function padRight(text: string, pad: string, length: number): string
{
    return pad.repeat(length - text.length).concat(text);
}
export function deepEquals(a: any, b: any): boolean
{
    if(a === b) return true;

    if (a && b && typeof a == 'object' && typeof b == 'object')
    {
        if (a.constructor !== b.constructor) return false;

        let length, i, keys;
        if (Array.isArray(a))
        {
            length = a.length;
            if (length != b.length) return false;
            for (i = length; i-- !== 0;)
                if (!deepEquals(a[i], b[i])) return false;
            return true;
        }

        if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
        if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
        if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();

        keys = Object.keys(a) as Array<keyof typeof a>;
        length = keys.length;
        if (length !== Object.keys(b).length) return false;

        for (i = length; i-- !== 0;)
            if (!Object.prototype.hasOwnProperty.call(b, keys[i]!)) return false;

        for (i = length; i-- !== 0;)
            if(!deepEquals(a[keys[i]!], b[keys[i]!])) return false;

        return true;
    }

    return a !== a && b !== b;
}
export function format(date: Date, template: string): string
{
    const months = {
        0: 'janvier',
        1: 'fevrier',
        2: 'mars',
        3: 'avril',
        4: 'mai',
        5: 'juin',
        6: 'juillet',
        7: 'aout',
        8: 'septembre',
        9: 'octobre',
        10: 'novembre',
        11: 'decembre',
    };
    const transforms: Record<string, (date: Date) => string> = {
        "yyyy": (date: Date) => date.getUTCFullYear().toString(),
        "MMMM": (date: Date) => months[date.getUTCMonth() as keyof typeof months],
        "MM": (date: Date) => padRight((date.getUTCMonth() + 1).toString(), '0', 2),
        "dd": (date: Date) => padRight(date.getUTCDate().toString(), '0', 2),
        "mm": (date: Date) => padRight(date.getUTCMinutes().toString(), '0', 2),
        "HH": (date: Date) => padRight(date.getUTCHours().toString(), '0', 2),
        "ss": (date: Date) => padRight(date.getUTCSeconds().toString(), '0', 2),
    };
    const keys = Object.keys(transforms);

    for(const key of keys)
    {
        template = key in transforms ? template.replaceAll(key, () => transforms[key]!(date)) : template;
    }

    return template;
}
export function clamp(x: number, min: number, max: number): number
{
    return x > max ? max : x < min ? min : x;
}
export function lerp(x: number, a: number, b: number): number
{
    return (1-x)*a+x*b;
}
// The value position is randomized
// The metadata separator is randomized from the URLSafeCharacters set
// The URI is (| == picked separator) |v_length|first part of the hash + value + second part of the hash|v_pos as hex.
export function cryptURI(key: string, value: number): string
{
    const hash = Bun.hash.crc32(key + value.toString()).toString(16);
    const pos = Math.floor(Math.random() * hash.length);
    const separator = URLSafeCharacters[URLSafeCharacters.length * Math.random() | 0]!;

    return encodeBase(separator + value.toString().length + separator + hash.substring(0, pos) + value + hash.substring(pos) + separator + pos);
}
export function decryptURI(uri: string, key: string): number | undefined
{
    const _uri = decodeBase(uri);
    
    const separator = _uri.charAt(0);
    const length = parseInt(_uri.substring(1, _uri.indexOf(separator, 1)), 10);
    const pos = parseInt(_uri.substring(_uri.lastIndexOf(separator) + 1), 16);
    const _hash = _uri.substring(_uri.lastIndexOf(separator, _uri.length - pos.toString(16).length - 2) + 1, _uri.lastIndexOf(separator));

    const value = _hash.substring(pos, pos + length);
    const hash = _hash.substring(0, pos) + _hash.substring(pos + length);
    
    if(Bun.hash.crc32(key + value).toString(16) === hash)
        return parseInt(value, 10);
    else
        return undefined;
}