/*
 * Common utilities for backend and frontend
 */
import { Document } from "yaml";

// Init dayjs
import dayjs from "dayjs";
import timezone from "dayjs/plugin/timezone";
import utc from "dayjs/plugin/utc";
import relativeTime from "dayjs/plugin/relativeTime";
dayjs.extend(utc);
dayjs.extend(timezone);
dayjs.extend(relativeTime);

let randomBytes : (numBytes: number) => Uint8Array;
initRandomBytes();

async function initRandomBytes() {
    if (typeof window !== "undefined" && window.crypto) {
        randomBytes = function randomBytes(numBytes: number) {
            const bytes = new Uint8Array(numBytes);
            for (let i = 0; i < numBytes; i += 65536) {
                window.crypto.getRandomValues(bytes.subarray(i, i + Math.min(numBytes - i, 65536)));
            }
            return bytes;
        };
    } else {
        randomBytes = (await import("node:crypto")).randomBytes;
    }
}

// Stack Status
export const UNKNOWN = 0;
export const CREATED_FILE = 1;
export const CREATED_STACK = 2;
export const RUNNING = 3;
export const EXITED = 4;

export function statusName(status : number) : string {
    switch (status) {
        case CREATED_FILE:
            return "draft";
        case CREATED_STACK:
            return "created_stack";
        case RUNNING:
            return "running";
        case EXITED:
            return "exited";
        default:
            return "unknown";
    }
}

export function statusNameShort(status : number) : string {
    switch (status) {
        case CREATED_FILE:
            return "inactive";
        case CREATED_STACK:
            return "inactive";
        case RUNNING:
            return "active";
        case EXITED:
            return "exited";
        default:
            return "?";
    }
}

export function statusColor(status : number) : string {
    switch (status) {
        case CREATED_FILE:
            return "dark";
        case CREATED_STACK:
            return "dark";
        case RUNNING:
            return "primary";
        case EXITED:
            return "danger";
        default:
            return "secondary";
    }
}

export const isDev = process.env.NODE_ENV === "development";
export const TERMINAL_COLS = 105;
export const TERMINAL_ROWS = 10;
export const PROGRESS_TERMINAL_ROWS = 8;

export const COMBINED_TERMINAL_COLS = 56;
export const COMBINED_TERMINAL_ROWS = 15;

export const ERROR_TYPE_VALIDATION = 1;

export const allowedCommandList : string[] = [
    "docker",
    "ls",
    "cd",
    "dir",
];

export const allowedRawKeys = [
    "\u0003", // Ctrl + C
];

/**
 * Generate a decimal integer number from a string
 * @param str Input
 * @param length Default is 10 which means 0 - 9
 */
export function intHash(str : string, length = 10) : number {
    // A simple hashing function (you can use more complex hash functions if needed)
    let hash = 0;
    for (let i = 0; i < str.length; i++) {
        hash += str.charCodeAt(i);
    }
    // Normalize the hash to the range [0, 10]
    return (hash % length + length) % length; // Ensure the result is non-negative
}

/**
 * Delays for specified number of seconds
 * @param ms Number of milliseconds to sleep for
 */
export function sleep(ms: number) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

/**
 * Generate a random alphanumeric string of fixed length
 * @param length Length of string to generate
 * @returns string
 */
export function genSecret(length = 64) {
    let secret = "";
    const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    const charsLength = chars.length;
    for ( let i = 0; i < length; i++ ) {
        secret += chars.charAt(getCryptoRandomInt(0, charsLength - 1));
    }
    return secret;
}

/**
 * Get a random integer suitable for use in cryptography between upper
 * and lower bounds.
 * @param min Minimum value of integer
 * @param max Maximum value of integer
 * @returns Cryptographically suitable random integer
 */
export function getCryptoRandomInt(min: number, max: number):number {
    // synchronous version of: https://github.com/joepie91/node-random-number-csprng

    const range = max - min;
    if (range >= Math.pow(2, 32)) {
        console.log("Warning! Range is too large.");
    }

    let tmpRange = range;
    let bitsNeeded = 0;
    let bytesNeeded = 0;
    let mask = 1;

    while (tmpRange > 0) {
        if (bitsNeeded % 8 === 0) {
            bytesNeeded += 1;
        }
        bitsNeeded += 1;
        mask = mask << 1 | 1;
        tmpRange = tmpRange >>> 1;
    }

    const bytes = randomBytes(bytesNeeded);
    let randomValue = 0;

    for (let i = 0; i < bytesNeeded; i++) {
        randomValue |= bytes[i] << 8 * i;
    }

    randomValue = randomValue & mask;

    if (randomValue <= range) {
        return min + randomValue;
    } else {
        return getCryptoRandomInt(min, max);
    }
}

export function getComposeTerminalName(stack : string) {
    return "compose-" + stack;
}

export function getCombinedTerminalName(stack : string) {
    return "combined-" + stack;
}

export function getContainerTerminalName(container : string) {
    return "container-" + container;
}

export function getContainerExecTerminalName(stackName : string, container : string, index : number) {
    return "container-exec-" + container + "-" + index;
}

export function copyYAMLComments(doc : Document, src : Document) {
    doc.comment = src.comment;
    doc.commentBefore = src.commentBefore;

    if (doc && doc.contents && src && src.contents) {
        // @ts-ignore
        copyYAMLCommentsItems(doc.contents.items, src.contents.items);
    }
}

/**
 * Copy yaml comments from srcItems to items
 * Typescript is super annoying here, so I have to use any here
 * TODO: Since comments are belong to the array index, the comments will be lost if the order of the items is changed or removed or added.
 */
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function copyYAMLCommentsItems(items : any, srcItems : any) {
    if (!items || !srcItems) {
        return;
    }

    for (let i = 0; i < items.length; i++) {
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        const item : any = items[i];

        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        const srcItem : any = srcItems[i];

        if (!srcItem) {
            continue;
        }

        if (item.key && srcItem.key) {
            item.key.comment = srcItem.key.comment;
            item.key.commentBefore = srcItem.key.commentBefore;
        }

        if (srcItem.comment) {
            item.comment = srcItem.comment;
        }

        if (item.value && srcItem.value) {
            if (typeof item.value === "object" && typeof srcItem.value === "object") {
                item.value.comment = srcItem.value.comment;
                item.value.commentBefore = srcItem.value.commentBefore;

                if (item.value.items && srcItem.value.items) {
                    copyYAMLCommentsItems(item.value.items, srcItem.value.items);
                }
            }
        }
    }
}