import { exec } from 'child_process';
import { Color, yellow } from 'colors';
import { createWriteStream, exists, mkdir, readFile, unlink, writeFile } from 'fs';
import * as nodemailer from 'nodemailer';
import { MailOptions } from 'nodemailer/lib/json-transport';
import * as path from 'path';
import { rimraf } from 'rimraf';
import { ExecOptions } from 'shelljs';
import * as Mail from 'nodemailer/lib/mailer';

const projectRoot = path.resolve(__dirname, '../../');
export function pathFromRoot(relative?: string) {
    if (!relative) {
        return projectRoot;
    }
    return path.resolve(projectRoot, relative);
}

export async function fileDescriptorFromStream(filePath: string) {
    const logStream = createWriteStream(filePath);
    return new Promise<number>(resolve => {
        logStream.on('open', resolve);
    });
}

export const commandLine = (command: string, fromDirectory?: string) =>
    new Promise<string>((resolve, reject) => {
        const options: ExecOptions = {};
        if (fromDirectory) {
            options.cwd = fromDirectory ? path.resolve(projectRoot, fromDirectory) : projectRoot;
        }
        exec(command, options, (err, stdout) => (err ? reject(err) : resolve(stdout)));
    });

export const readTextFile = (relativePath: string) => {
    const target = path.resolve(__dirname, relativePath);
    return new Promise<string>((resolve, reject) => {
        readFile(target, (err, data) => (err ? reject(err) : resolve(data.toString())));
    });
};

export const writeTextFile = (relativePath: string, contents: any) => {
    const target = path.resolve(__dirname, relativePath);
    return new Promise<void>((resolve, reject) => {
        writeFile(target, contents, err => (err ? reject(err) : resolve()));
    });
};

export type Messager<T> = (outcome: { result: T | undefined; error: Error | null }) => string;

export interface LogData<T> {
    startMessage: string;
    // if you care about the execution informing your log, you can pass in a function that takes in the result and a potential error and decides what to write
    endMessage: string | Messager<T>;
    action: () => T | Promise<T>;
    color?: Color;
}

function logHelper(content: string, color: Color | string) {
    if (typeof color === 'string') {
        console.log(color, content);
    } else {
        console.log(color(content));
    }
}

let current = Math.ceil(Math.random() * 20);
export async function logExecution<T>({ startMessage, endMessage, action, color }: LogData<T>): Promise<T | undefined> {
    let result: T | undefined;
    let error: Error | null = null;
    const resolvedColor = color || `\x1b[${31 + (++current % 6)}m%s\x1b[0m`;
    logHelper(`${startMessage}...`, resolvedColor);
    try {
        result = await action();
    } catch (e: any) {
        error = e;
    } finally {
        logHelper(typeof endMessage === 'string' ? endMessage : endMessage({ result, error }), resolvedColor);
    }
    return result;
}
export function logPort(listener: string, port: number) {
    console.log(`${listener} listening on port ${yellow(String(port))}`);
}

export function msToTime(duration: number) {
    const milliseconds = Math.floor((duration % 1000) / 100);
    const seconds = Math.floor((duration / 1000) % 60);
    const minutes = Math.floor((duration / (1000 * 60)) % 60);
    const hours = Math.floor((duration / (1000 * 60 * 60)) % 24);

    const hoursS = hours < 10 ? '0' + hours : hours;
    const minutesS = minutes < 10 ? '0' + minutes : minutes;
    const secondsS = seconds < 10 ? '0' + seconds : seconds;

    return hoursS + ':' + minutesS + ':' + secondsS + '.' + milliseconds;
}

export const createIfNotExists = async (filePath: string) => {
    if (
        await new Promise<boolean>(resolve => {
            exists(filePath, resolve);
        })
    ) {
        return true;
    }
    return new Promise<boolean>(resolve => {
        mkdir(filePath, error => resolve(error === null));
    });
};

export async function Prune(rootDirectory: string): Promise<boolean> {
    // const error =  await new Promise<Error>(resolve => rimraf(rootDirectory).then(resolve));
    await new Promise<void>(resolve => {
        rimraf(rootDirectory).then(() => resolve());
    });
    // return error === null;
    return true;
}

export const Destroy = (mediaPath: string) =>
    new Promise<boolean>(resolve => {
        unlink(mediaPath, error => resolve(error === null));
    });

export namespace Email {
    const smtpTransport = nodemailer.createTransport({
        service: 'Gmail',
        auth: {
            user: 'browndashptc@gmail.com',
            pass: 'TsarNicholas#2',
        },
    });

    export interface DispatchOptions<T extends string | string[]> {
        to: T;
        subject: string;
        content: string;
        attachments?: Mail.Attachment | Mail.Attachment[];
    }

    export interface DispatchFailure {
        recipient: string;
        error: Error;
    }

    export async function dispatchAll({ to, subject, content, attachments }: DispatchOptions<string[]>) {
        const failures: DispatchFailure[] = [];
        await Promise.all(
            to.map(async recipient => {
                const resolved = attachments ? ('length' in attachments ? attachments : [attachments]) : undefined;
                const error = await Email.dispatch({ to: recipient, subject, content, attachments: resolved });
                if (error !== null) {
                    failures.push({
                        recipient,
                        error,
                    });
                }
            })
        );
        return failures.length ? failures : undefined;
    }

    export async function dispatch({ to, subject, content, attachments }: DispatchOptions<string>): Promise<Error | null> {
        const mailOptions = {
            to,
            from: 'browndashptc@gmail.com',
            subject,
            text: `Hello ${to.split('@')[0]},\n\n${content}`,
            attachments,
        } as MailOptions;
        return new Promise<Error | null>(resolve => {
            smtpTransport.sendMail(mailOptions, resolve);
        });
    }
}