/*
 * Copyright (C) 2013 Red Hat, Inc.
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

export interface PamCommon {
    name: string,
    password: string,
    gid: number,
}

export interface PasswdUserInfo extends PamCommon {
    uid: number,
    gecos: string,
    home: string,
    shell: string,
}

export interface EtcGroupInfo extends PamCommon {
    userlist: string[],
}

function parse_passwd_content(content: string): PasswdUserInfo[] {
    if (!content) {
        console.warn("Couldn't read /etc/passwd");
        return [];
    }

    const ret = [];
    const lines = content.split('\n');

    for (let i = 0; i < lines.length; i++) {
        if (!lines[i])
            continue;
        const column = lines[i].split(':');
        ret.push({
            name: column[0],
            password: column[1],
            uid: parseInt(column[2], 10),
            gid: parseInt(column[3], 10),
            gecos: (column[4] || '').replace(/,*$/, ''),
            home: column[5] || '',
            shell: column[6] || '',
        });
    }

    return ret;
}

export const etc_passwd_syntax = {
    parse: parse_passwd_content
};

function parse_group_content(content: string): EtcGroupInfo[] {
    // /etc/group file is used to set only secondary groups of users. The primary group is saved in /etc/passwd-
    content = (content || "").trim();
    if (!content) {
        console.warn("Couldn't read /etc/group");
        return [];
    }

    const ret = [];
    const lines = content.split('\n');

    for (let i = 0; i < lines.length; i++) {
        if (!lines[i])
            continue;
        const column = lines[i].split(':');
        ret.push({
            name: column[0],
            password: column[1],
            gid: parseInt(column[2], 10),
            userlist: column[3].split(','),
        });
    }

    return ret;
}

export const etc_group_syntax = {
    parse: parse_group_content
};

function parse_shells_content(content: string) {
    content = (content || "").trim();
    if (!content) {
        console.warn("Couldn't read /etc/shells");
        return [];
    }

    const lines = content.split('\n');

    return lines.filter(line => !line.includes("#") && line.trim());
}

export const etc_shells_syntax = {
    parse: parse_shells_content
};