//SVR.JS USER TOOL
var readline = require("readline");
var process = require("process");
var fs = require("fs");
try {
  var crypto = require('crypto');
} catch (ex) {
  var crypto = {};
  crypto.__disabled__ = null;
  crypto.createHash = function(type) {
    if (type != "SHA256") throw new Error("Hash type not supported!");
    return {
      msg: "",
      update: function(a) {
        this.msg = a;
        return this;
      },
      digest: function(ty) {
        var chrsz = 8;
        var hexcase = 0;

        function safe_add(x, y) {
          var lsw = (x & 0xFFFF) + (y & 0xFFFF);
          var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
          return (msw << 16) | (lsw & 0xFFFF);
        }

        function S(X, n) {
          return (X >>> n) | (X << (32 - n));
        }

        function R(X, n) {
          return (X >>> n);
        }

        function Ch(x, y, z) {
          return ((x & y) ^ ((~x) & z));
        }

        function Maj(x, y, z) {
          return ((x & y) ^ (x & z) ^ (y & z));
        }

        function Sigma0256(x) {
          return (S(x, 2) ^ S(x, 13) ^ S(x, 22));
        }

        function Sigma1256(x) {
          return (S(x, 6) ^ S(x, 11) ^ S(x, 25));
        }

        function Gamma0256(x) {
          return (S(x, 7) ^ S(x, 18) ^ R(x, 3));
        }

        function Gamma1256(x) {
          return (S(x, 17) ^ S(x, 19) ^ R(x, 10));
        }

        function core_sha256(m, l) {
          var K = new Array(0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 0xE49B69C1, 0xEFBE4786, 0xFC19DC6, 0x240CA1CC, 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 0xC6E00BF3, 0xD5A79147, 0x6CA6351, 0x14292967, 0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13, 0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85, 0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3, 0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070, 0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5, 0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3, 0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208, 0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2);
          var HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
          var W = new Array(64);
          var a, b, c, d, e, f, g, h, i, j;
          var T1, T2;

          m[l >> 5] |= 0x80 << (24 - l % 32);
          m[((l + 64 >> 9) << 4) + 15] = l;

          for (var i = 0; i < m.length; i += 16) {
            a = HASH[0];
            b = HASH[1];
            c = HASH[2];
            d = HASH[3];
            e = HASH[4];
            f = HASH[5];
            g = HASH[6];
            h = HASH[7];

            for (var j = 0; j < 64; j++) {
              if (j < 16) W[j] = m[j + i];
              else W[j] = safe_add(safe_add(safe_add(Gamma1256(W[j - 2]), W[j - 7]), Gamma0256(W[j - 15])), W[j - 16]);

              T1 = safe_add(safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]), W[j]);
              T2 = safe_add(Sigma0256(a), Maj(a, b, c));

              h = g;
              g = f;
              f = e;
              e = safe_add(d, T1);
              d = c;
              c = b;
              b = a;
              a = safe_add(T1, T2);
            }

            HASH[0] = safe_add(a, HASH[0]);
            HASH[1] = safe_add(b, HASH[1]);
            HASH[2] = safe_add(c, HASH[2]);
            HASH[3] = safe_add(d, HASH[3]);
            HASH[4] = safe_add(e, HASH[4]);
            HASH[5] = safe_add(f, HASH[5]);
            HASH[6] = safe_add(g, HASH[6]);
            HASH[7] = safe_add(h, HASH[7]);
          }
          return HASH;
        }

        function str2binb(str) {
          var bin = Array();
          var mask = (1 << chrsz) - 1;
          for (var i = 0; i < str.length * chrsz; i += chrsz) {
            bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i % 32);
          }
          return bin;
        }

        function Utf8Encode(string) {
          string = string.replace(/\r\n/g, '\n');
          var utftext = '';

          for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
              utftext += String.fromCharCode(c);
            } else if ((c > 127) && (c < 2048)) {
              utftext += String.fromCharCode((c >> 6) | 192);
              utftext += String.fromCharCode((c & 63) | 128);
            } else {
              utftext += String.fromCharCode((c >> 12) | 224);
              utftext += String.fromCharCode(((c >> 6) & 63) | 128);
              utftext += String.fromCharCode((c & 63) | 128);
            }

          }

          return utftext;
        }

        function binb2hex(binarray) {
          var hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef';
          var str = '';
          for (var i = 0; i < binarray.length * 4; i++) {
            str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF) +
              hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xF);
          }
          return str;
        }

        s = Utf8Encode(this.msg);
        var str = binb2hex(core_sha256(str2binb(s), s.length * chrsz));
        if (ty == "hex") return str;
        var hx = [];
        for (var i = 0; i < str.length; i += 2) {
          hx.push(parseInt(str[i] + str[i + 1], 16));
        }
        return new Buffer(hx);
      }
    };
  }
}

if (!crypto.randomInt) {
  crypto.randomInt = function(min, max) {
    return Math.round(Math.random() * (max - min)) + min;
  }
}
var configJSON = {};
if (fs.existsSync("config.json")) {
  var configJSONf = "";
  try {
    configJSONf = fs.readFileSync("config.json"); //Read JSON File
  } catch (ex) {
    throw new Error("Cannot read JSON file.");
  }
  try {
    configJSON = JSON.parse(configJSONf); //Parse JSON
  } catch (ex) {
    throw new Error("JSON Parse error.");
  }
}

var users = [];
if (configJSON.users != undefined) users = configJSON.users;

function saveConfig() {
  var configJSONobj = {};
  if (fs.existsSync("./config.json")) configJSONobj = JSON.parse(fs.readFileSync("./config.json").toString());
  configJSONobj.users = users;
  var configString = JSON.stringify(configJSONobj, null, 2);
  fs.writeFileSync("config.json", configString);
}

var args = process.argv;
var user = "";
var action = "change";
if (process.argv.length <= (process.argv[0].indexOf("node") > -1 || process.argv[0].indexOf("bun") > -1 ? 2 : 1)) args.push("-h");
for (var i = (process.argv[0].indexOf("node") > -1 || process.argv[0].indexOf("bun") > -1 ? 2 : 1); i < args.length; i++) {
  if (args[i] == "-h" || args[i] == "--help" || args[i] == "-?" || args[i] == "/h" || args[i] == "/?") {
    console.log("SVR.JS user tool usage:");
    console.log("node svrpasswd.js [-h] [--help] [-?] [/h] [/?] [-a|--add|-d|--delete] <username>");
    console.log("-h -? /h /? --help    -- Displays help");
    console.log("-a --add              -- Add an user");
    console.log("-d --delete           -- Deletes an user");
    process.exit(0);
  } else if (args[i] == "-a" || args[i] == "--add") {
    if (action != "change") {
      console.log("Multiple actions specified.");
      console.log("node svrpasswd.js [-h] [--help] [-?] [/h] [/?] [-a|--add|-d|--delete] <username>");
      console.log("-h -? /h /? --help    -- Displays help");
      console.log("-a --add              -- Add an user");
      console.log("-d --delete           -- Deletes an user");
      process.exit(1);
    }
    action = "add";
  } else if (args[i] == "-d" || args[i] == "--delete") {
    if (action != "change") {
      console.log("Multiple actions specified.");
      console.log("node svrpasswd.js [-h] [--help] [-?] [/h] [/?] [-a|--add|-d|--delete] <username>");
      console.log("-h -? /h /? --help    -- Displays help");
      console.log("-a --add              -- Add an user");
      console.log("-d --delete           -- Deletes an user");
      process.exit(1);
    }
    action = "delete";
  } else {
    if (user != "") {
      console.log("Multiple users specified.");
      console.log("node svrpasswd.js [-h] [--help] [-?] [/h] [/?] [-a|--add|-d|--delete] <username>");
      console.log("-h -? /h /? --help    -- Displays help");
      console.log("-a --add              -- Add an user");
      console.log("-d --delete           -- Deletes an user");
      process.exit(1);
    }
    user = args[i];
  }
}

if (user == "") {
  console.log("No user specified.");
  console.log("node svrpasswd.js [-h] [--help] [-?] [/h] [/?] [-a|--add|-d|--delete] <username>");
  console.log("-h -? /h /? --help    -- Displays help");
  console.log("-a --add              -- Add an user");
  console.log("-d --delete           -- Deletes an user");
  process.exit(1);
}

function getUserIndex(username) {
  var ind = -1
  for (var i = 0; i < users.length; i++) {
    if (users[i].name == username) {
      ind = i;
      break;
    }
  }
  return ind;
}

function sha256(msg) {
  var hash = crypto.createHash("SHA256");
  hash.update(msg);
  return hash.digest('hex');
}

function generateSalt() {
  var token = "";
  var strlist = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  for (var i = 0; i < 63; i++) {
    token += strlist[crypto.randomInt(0, strlist.length)];
  }
  return token;
}

function password(callback) {
  var rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'Password: '
  });
  rl.prompt();
  process.stdout.writeold = process.stdout.write;
  process.stdout.write = function (s) {
    process.stdout.writeold(s.replace(/[^\r\n]/g, ""));
  };
  rl.once('line', function (line) {
    process.stdout.write = process.stdout.writeold;
    var rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
      prompt: 'Confirm password: ',
    });
    rl.prompt();
    process.stdout.writeold = process.stdout.write;
    process.stdout.write = function (s) {
      process.stdout.writeold(s.replace(/[^\r\n]/g, ""));
    };
    rl.on('line', function (line2) {
      process.stdout.write = process.stdout.writeold;
      rl.close();
      if (line != line2) callback(false);
      else callback(line);
    });
  });
}

var userindex = getUserIndex(user);
if (action == "add" && userindex != -1) {
  console.log("User alerady exists.");
  process.exit(1);
} else if (action != "add" && userindex == -1) {
  console.log("User doesn't exist.");
  process.exit(1);
}
if (action == "delete") {
  users.splice(userindex, 1);
  saveConfig();
  console.log("User deleted successfully");
} else if (action == "add") {
  password(function(password) {
    if (!password) {
      console.log("Passwords don't match!");
      process.exit(1);
    } else {
      var salt = generateSalt()
      users.push({
        name: user,
        pass: sha256(password + salt),
        salt: salt
      });
      saveConfig();
      console.log("User added successfully");
    }
  });
} else {
  password(function(password) {
    if (!password) {
      console.log("Passwords don't match!");
      process.exit(1);
    } else {
      var salt = generateSalt()
      users[userindex] = {
        name: user,
        pass: sha256(password + salt),
        salt: salt
      };
      saveConfig();
      console.log("Password changed successfully");
    }
  });
}