const glob = require("glob");
const path = require("path");
const dayjs = require("dayjs");
const fs = require("fs-extra");
const axios = require("axios");
const Mustache = require("mustache");
const openpgp = require("openpgp");
const Notifications = require("./Notifications.js");
const Odmdb = require("./Odmdb.js");

const conf = require(`../../../conf.json`);
const currentmod = "Pagans";
const log = conf.api.activelog.includes(currentmod);
/**
 * Pagan Management numeric Identity and Person  (Person = Pagan Id + tribe)
 *
 *
 *
 */
const Pagans = {};

/**
 *  Remove authentification token after a logout
 * @param {string} alias
 * @param {string} tribe
 * @param {integer} xdays
 * @param {string} xhash
 * @returns {status:200, ref:"Pagans",msg:"logout"}
 * tmpfs name file has to be on line with the tmpfs create by isAuthenticated
 *  tmpfs contain profils name for a tribe/
 */
Pagans.logout = (alias, tribe, xdays, xhash) => {
  //console.log(alias, tribe, xdays, xhash);
  // inline with middleware isAuthenticated.js
  let tmpfs = `../../tmp/tokens/${alias}_${tribe}_${xdays}`;
  //max filename in ext4: 255 characters
  tmpfs += `_${xhash.substring(150, 150 + tmpfs.length - 249)}.json`;
  fs.remove(tmpfs);
  if (log) console.log(currentmod, "logout token", tmpfs);
  return { status: 200, ref: "Pagans", msg: "logout" };
};

/**
 * @param {string} alias a alias that exist or not
 * @return {object}  { status: 200, ref:"pagans",msg:"aliasexist",data: { alias, publicKey } }
 *                   { status: 404, ref:"pagans",msg:"aliasdoesnotexist",data: { alias} }
 *
 **/
Pagans.getalias = (alias) => {
  //bypass Odmdb cause all is public save ressources
  console.log(path.resolve(`../objects/pagans/itm/${alias}.json`));
  if (fs.existsSync(`../objects/pagans/itm/${alias}.json`)) {
    return {
      status: 200,
      ref: "Pagans",
      msg: "aliasexist",
      data: fs.readJSONSync(`../objects/pagans/itm/${alias}.json`),
    };
  } else {
    return {
      status: 404,
      ref: "Pagans",
      msg: "aliasdoesnotexist",
      data: { alias },
    };
  }
};

/**
 * Send email with alias's keys to email or person alias person.recovery.email
 *
 * If email or pubkey is undefined then get data from tribe/person(alias)
 * Send email with keys
 * @param {object} data
 * @param {string} data.alias
 * @param {pgpPrivate} [data.privatekey]
 * @param {string} [data.passphrase]
 * @param {string} data.tribe
 * @param {pgpPublic} [data.publickey]
 * @param {string} [data.email]
 * @param {string} data.lg
 */
Pagans.sendmailkey = (data) => {
  if (log)
    console.log(
      currentmod,
      data.alias,
      "-",
      data.privatekey ? data.privatekey.substring(0, 10) : "",
      "-",
      data.tribe,
      "-",
      data.passphrase,
      "-",
      data.publickey ? data.publickey.substring(0, 10) : "",
      "-",
      data.email,
      "-",
      data.lg
    );
  const person = {
    alias: data.alias,
    privatekey: data.privatekey,
    tribe: data.tribe,
  };

  if (!data.publickey || !data.email || !data.privatekey) {
    const personfile = `../../${data.tribe}/objects/persons/itm/${data.alias}.json`;
    if (!fs.existsSync(personfile)) {
      return {
        status: 404,
        ref: "Pagans",
        msg: "persondoesnotexist",
        data: { alias: data.alias, tribe: data.tribe },
      };
    }
    const persondata = fs.readJsonSync(personfile);
    if (!persondata.recoveryauth) {
      return {
        status: 404,
        ref: "Pagans",
        msg: "personhasnorecoveryauth",
        data: { alias: data.alias, tribe: data.tribe, email: data.email },
      };
    }
    person.email = persondata.recoveryauth.email;
    person.publickey = persondata.recoveryauth.publickey;
    person.privatekey = persondata.recoveryauth.privatekey;
    person.passphrase = persondata.recoveryauth.passphrase;
  } else {
    person.email = data.email;
    person.passphrase = data.passphrase;
    person.publickey = data.publickey;
  }
  person.avecpassphrase = person.passphrase != "";
  let tplfile = `../../${data.tribe}/template/createidentity_${data.lg}.js`;
  if (!fs.existsSync(tplfile)) {
    tplfile = `../template/createidentity_${data.lg}.js`;
    if (!fs.existsSync(tplfile)) {
      return {
        status: 406,
        ref: "Pagans",
        msg: "templatedoesnotexist",
        data: { tplfile },
      };
    }
  }
  const tplemail = require(path.resolve(tplfile));
  /*
  Remove from attachments for less user confusing
     {
        filename:`${person.alias}_publickey.txt`,
        content: person.publickey,
        contentType:"text/plain"
      },
  */
  const maildata = {
    from: tplemail.sender,
    to: person.email,
    subject: Mustache.render(tplemail.subject, person),
    html: Mustache.render(tplemail.html, person),
    text: Mustache.render(tplemail.text, person),
    attachments: [
      {
        filename: `${person.alias}_privatekey.txt`,
        content: person.privatekey,
        contentType: "text/plain",
      },
    ],
  };
  return Notifications.sendmail(maildata, data.tribe);
};

Pagans.authenticatedetachedSignature = async (
  alias,
  pubK,
  detachedSignature,
  message
) => {
  /**
   *  Check that a message was signed with a privateKey from a publicKey
   *  This is not necessary if isAuthenticated, but can be usefull to double check
   *  @TODO finish it and implement it also in  /apxpagan.js for browser
   *  @alias {string} alias link to the publicKey
   *  @pubK {string} publiKey text format
   *  @detachedSignature  {string} a detachedsignatured get from apx.detachedSignature
   *  @message {string} the message signed
   *  @return {boolean} true the message was signed by alias
   *                    false the message was not signed by alias
   */
  const publicKey = await openpgp.readKey({ armoredKey: pubK });
  const msg = await openpgp.createMessage({ text: message });
  const signature = await openpgp.readSignature({
    armoredSignature: detachedSignature, // parse detached signature
  });
  const verificationResult = await openpgp.verify({
    msg, // Message object
    signature,
    verificationKeys: publicKey,
  });
  const { verified, keyID } = verificationResult.signatures[0];
  try {
    await verified; // throws on invalid signature
    if (log) console.log(currentmod, "Signed by key id " + keyID.toHex());
    return KeyId.toHex().alias == alias;
  } catch (e) {
    if (log)
      console.log(currentmod, "Signature could not be verified: " + e.message);
    return false;
  }
};

module.exports = Pagans;