#!/usr/bin/env node

// Packages
const chalk = require("chalk");
const minimist = require("minimist");
const ms = require("ms");
const table = require("text-table");

// Ours
const cfg = require("../lib/cfg");
const DomainRecords = require("../lib/domain-records");
const indent = require("../lib/indent");
const login = require("../lib/login");
const strlen = require("../lib/strlen");
const { handleError, error } = require("../lib/error");
const exit = require("../lib/utils/exit");
const logo = require("../lib/utils/output/logo");

const argv = minimist(process.argv.slice(2), {
  string: ["config"],
  boolean: ["help", "debug"],
  alias: {
    help: "h",
    config: "c",
    debug: "d",
    token: "t"
  }
});

const subcommand = argv._[0];

// options
const help = () => {
  console.log(
    `
  ${chalk.bold(`${logo} now dns ls`)} [domain]
  ${chalk.bold(`${logo} now dns add`)} <domain> <name> <A | AAAA | ALIAS | CNAME | TXT> <value>
  ${chalk.bold(`${logo} now dns add`)} <domain> <name> MX <value> <mx_priority>
  ${chalk.bold(`${logo} now dns add`)} <domain> <name> SRV <priority> <weight> <port> <target>
  ${chalk.bold(`${logo} now dns rm`)} <id>

  ${chalk.dim("Options:")}

    -h, --help              output usage information
    -c ${chalk.bold.underline("FILE")}, --config=${chalk.bold.underline("FILE")}  config file
    -d, --debug             debug mode [off]
    -t ${chalk.bold.underline("TOKEN")}, --token=${chalk.bold.underline("TOKEN")} login token

  ${chalk.dim("Examples:")}

  ${chalk.gray("–")} List all your DNS records

      ${chalk.cyan("$ now dns ls")}

  ${chalk.gray("–")} Add an A record for a subdomain

      ${chalk.cyan("$ now dns add <YOUR DOMAIN> <SUBDOMAIN NAME> A <RECORD VALUE>")}
      ${chalk.cyan("$ now dns add zeit.rocks api A 198.51.100.100")}

  ${chalk.gray("–")} Add an MX record (@ as a name refers to the domain)

      ${chalk.cyan("$ now dns add <YOUR DOMAIN> @ MX <RECORD VALUE> <PRIORITY>")}
      ${chalk.cyan("$ now dns add zeit.rocks @ MX mail.zeit.rocks 10")}
`
  );
};

// options
const debug = argv.debug;
const apiUrl = argv.url || "https://api.zeit.co";
if (argv.config) {
  cfg.setConfigFile(argv.config);
}

if (argv.help || !subcommand) {
  help();
  exit(0);
} else {
  const config = cfg.read();

  Promise.resolve(argv.token || config.token || login(apiUrl))
    .then(async token => {
      try {
        await run(token);
      } catch (err) {
        handleError(err);
        exit(1);
      }
    })
    .catch(e => {
      error(`Authentication error – ${e.message}`);
      exit(1);
    });
}

async function run(token) {
  const domainRecords = new DomainRecords(apiUrl, token, { debug });
  const args = argv._.slice(1);
  const start = Date.now();

  if (subcommand === "ls" || subcommand === "list") {
    if (args.length > 1) {
      error(
        `Invalid number of arguments. Usage: ${chalk.cyan("`now dns ls [domain]`")}`
      );
      return exit(1);
    }

    const elapsed = ms(new Date() - start);
    const res = await domainRecords.ls(args[0]);
    const text = [];
    let count = 0;
    res.forEach((records, domain) => {
      count += records.length;
      if (records.length > 0) {
        const cur = Date.now();
        const header = [
          ["", "id", "name", "type", "value", "aux", "created"].map(s =>
            chalk.dim(s))
        ];
        const out = table(
          header.concat(
            records.map(record => {
              const time = chalk.gray(
                ms(cur - new Date(Number(record.created))) + " ago"
              );
              return [
                "",
                record.id,
                record.name,
                record.type,
                record.value,
                record.mxPriority || record.priority || "",
                time
              ];
            })
          ),
          {
            align: ["l", "r", "l", "l", "l", "l"],
            hsep: " ".repeat(2),
            stringLength: strlen
          }
        );
        text.push(`\n\n${chalk.bold(domain)}\n${indent(out, 2)}`);
      }
    });
    console.log(
      `> ${count} record${count === 1 ? "" : "s"} found ${chalk.gray(`[${elapsed}]`)}`
    );
    console.log(text.join(""));
  } else if (subcommand === "add") {
    const param = parseAddArgs(args);
    if (!param) {
      error(
        `Invalid number of arguments. See: ${chalk.cyan("`now dns --help`")} for usage.`
      );
      return exit(1);
    }
    const record = await domainRecords.create(param.domain, param.data);
    const elapsed = ms(new Date() - start);
    console.log(
      `${chalk.cyan("> Success!")} A new DNS record for domain ${chalk.bold(param.domain)} ${chalk.gray(`(${record.uid})`)} created ${chalk.gray(`[${elapsed}]`)}`
    );
  } else if (subcommand === "rm" || subcommand === "remove") {
    if (args.length !== 1) {
      error(
        `Invalid number of arguments. Usage: ${chalk.cyan("`now dns rm <id>`")}`
      );
      return exit(1);
    }

    const record = await domainRecords.getRecord(args[0]);
    if (!record) {
      error("DNS record not found");
      return exit(1);
    }

    const yes = await readConfirmation(
      record,
      "The following record will be removed permanently\n"
    );
    if (!yes) {
      error("User abort");
      return exit(0);
    }

    await domainRecords.delete(record.domain, record.id);
    const elapsed = ms(new Date() - start);
    console.log(
      `${chalk.cyan("> Success!")} Record ${chalk.gray(`${record.id}`)} removed ${chalk.gray(`[${elapsed}]`)}`
    );
  } else {
    error("Please specify a valid subcommand: ls | add | rm");
    help();
    exit(1);
  }
  return domainRecords.close();
}

process.on("uncaughtException", err => {
  handleError(err);
  exit(1);
});

function parseAddArgs(args) {
  if (!args || args.length < 4) {
    return null;
  }

  const domain = args[0];
  const name = args[1] === "@" ? "" : args[1];
  const type = args[2];
  const value = args[3];

  if (!(domain && typeof name === "string" && type)) {
    return null;
  }

  if (type === "MX") {
    if (args.length !== 5) {
      return null;
    }

    return {
      domain,
      data: {
        name,
        type,
        value,
        mxPriority: args[4]
      }
    };
  } else if (type === "SRV") {
    if (args.length !== 7) {
      return null;
    }

    return {
      domain,
      data: {
        name,
        type,
        srv: {
          priority: value,
          weight: args[4],
          port: args[5],
          target: args[6]
        }
      }
    };
  }

  if (args.length !== 4) {
    return null;
  }

  return {
    domain,
    data: {
      name,
      type,
      value
    }
  };
}

function readConfirmation(record, msg) {
  return new Promise(resolve => {
    const time = chalk.gray(
      ms(new Date() - new Date(Number(record.created))) + " ago"
    );
    const tbl = table(
      [
        [
          record.id,
          chalk.bold(
            `${record.name.length > 0 ? record.name + "." : ""}${record.domain} ${record.type} ${record.value} ${record.mxPriority ? record.mxPriority : ""}`
          ),
          time
        ]
      ],
      { align: ["l", "r", "l"], hsep: " ".repeat(6) }
    );

    process.stdout.write(`> ${msg}`);
    process.stdout.write("  " + tbl + "\n");

    process.stdout.write(
      `${chalk.bold.red("> Are you sure?")} ${chalk.gray("[y/N] ")}`
    );

    process.stdin
      .on("data", d => {
        process.stdin.pause();
        resolve(d.toString().trim().toLowerCase() === "y");
      })
      .resume();
  });
}