import * as nm from 'nodemailer'
import config from '../config/environment'

class Mailer {

    private mailConfig: nm.SentMessageInfo
    private mailOptions: nm.SendMailOptions
    private isDev: boolean = false
    private devEnv: string[] = ['development', 'test', 'preproduction']

    public constructor() {
        if (this.devEnv.indexOf(config.env) !== -1) {
            this.isDev = true
        }
    }

    public send = (
        to: string[],
        subject: string,
        template: string
    ): void | string[] => {
        const dest: string = to.join(',')
        const text: string = template // TODO : create and find actual template
        if (this.isDev) {
            this.sendDev(dest, subject, text)
        } else {
            this.sendProd(dest, subject, text)
        }
    }

    private sendDev = (
        dest: string,
        subject: string,
        text: string
    ): void | string[] => {
        nm.createTestAccount((err: Error, account: nm.TestAccount) => {
            this.mailConfig = this.setMailConfig(account)
            const transporter: nm.Transporter = nm.createTransport(this.mailConfig)
            this.mailOptions = this.setMailOptions(dest, subject, text)
            transporter.sendMail(
                this.mailOptions,
                (error: Error, info: nm.SentMessageInfo)
            => {
                // no empty block
            })
        })
    }

    private sendProd = (
        dest: string,
        subject: string,
        text: string
    ): void | string[] => {
        this.mailConfig = this.setMailConfig()
        this.mailOptions = this.setMailOptions(dest, subject, text)
        const transporter: nm.Transporter = nm.createTransport(this.mailConfig)
        transporter.sendMail(
            this.mailOptions,
            (error: Error, info: nm.SentMessageInfo)
        => {
            // No empty block
        })
    }

    private setMailConfig = (
        account: nm.TestAccount = null
    ): nm.SentMessageInfo  => {
        const conf: nm.SentMessageInfo =  {
            host: config.mail.host,
            port: 587,
            auth: {
                user: null,
                pass: null
            }
        }
        if (this.isDev) {
            conf.auth.user = account.user
            conf.auth.pass = account.pass
        } else {
            conf.auth.user = config.mail.username
            conf.auth.pass = config.mail.password
        }
        return conf
    }

    private setMailOptions = (
        dest: string,
        subject: string,
        text: string
    ): nm.SendMailOptions => {
        return {
            from: '"Night Vision 👻" <contact@night-vision.com>',
            to: dest,
            subject: subject,
            html: text
        }
    }
}

export default new Mailer()

{
    "compilerOptions": {
        "target": "es2017",
        "module": "commonjs",
        "sourceMap": true,
        "removeComments": true,
        "outDir": "./dist/",
        "pretty": true
    }
}

{
    "comment-format": [
        true,
        "check-space"
    ],
    "extends": "tslint:latest",
    "rulesDirectory": [],
    "rules": {
        "no-implicit-dependencies": false,
        "arrow-parens": false,
        "class-name": true,
        "forin": true,
        "deprecation": true,
        "curly": true,
        "eofline": true,
        "indent": [
            true,
            "spaces",
            4
        ],
        "no-console": [
            true,
            "debug",
            "info",
            "time",
            "timeEnd",
            "trace",
            "log"
        ],
        "only-arrow-functions": true,
        "max-line-length": [
            true,
            100
        ],
        "member-ordering": [
            true,
            {
                "order": [
                    "public-before-private",
                    "static-before-instance",
                    "variables-before-functions"
                ]
            }
        ],
        "typedef": [
            true,
            "call-signature",
            "arrow-call-signature",
            "parameter",
            "arrow-parameter",
            "property-declaration",
            "member-variable-declaration",
            "variable-declaration"
        ],
        "no-arg": true,
        "no-construct": true,
        "no-duplicate-variable": true,
        "no-duplicate-imports": true,
        "no-unused-variable": true,
        "no-non-null-assertion": true,
        "no-shadowed-variable": true,
        "no-string-literal": false,
        "no-string-throw": true,
        "no-switch-case-fall-through": true,
        "no-empty": true,
        "no-eval": true,
        "no-namespace": false,
        "no-trailing-whitespace": true,
        "no-unused-expression": true,
        "linebreak-style": [
            true,
            "LF"
        ],
        "one-line": [
            true,
            "check-open-brace",
            "check-catch",
            "check-else",
            "check-whitespace"
        ],
        "ordered-imports": false,
        "quotemark": [
            true,
            "single"
        ],
        "semicolon": [
            true,
            "never"
        ],
        "space-before-function-paren": false,
        "object-literal-shorthand": [
            true,
            "never"
        ],
        "trailing-comma": true,
        "triple-equals": true,
        "variable-name": [
            true,
            "ban-keywords"
        ],
        "object-literal-sort-keys": false,
        "cyclomatic-complexity": true,
        "whitespace": [
            true,
            "check-branch",
            "check-operator",
            "check-typecast"
        ]
    }
}