const { config } = require("dotenv");
const path = require("path");
config({ path: path.join(__dirname, ".env") });
const { mongoDB } = require("./init/mongodb");
const { connectDB } = require("./init/mongodb");
const { ObjectID } = require("mongodb");
const { performance } = require("perf_hooks");
const fs = require("fs");

// const { QuerySnapshotData } = require("firebase-firestore");

console.log(config());

const admin = require("firebase-admin");

// const { User } = require("./models/user");
// const { Leaderboard } = require("./models/leaderboard");
// const { BotCommand } = require("./models/bot-command");

const serviceAccount = require("./credentials/serviceAccountKey.json");

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
});

var db = admin.firestore();
var auth = admin.auth();

process.on("SIGTERM", async () => {
  console.info("SIGTERM signal received. Stopping after this user is done");
  await currentUserPromise;
  process.exit(1);
});

process.on("exit", async () => {
  console.info("exit signal received. Stopping after this user is done");
  await currentUserPromise;
  process.exit(1);
});

process.on("SIGINT", async () => {
  console.info("SIGINT signal received. Stopping after this user is done");
  await currentUserPromise;
  process.exit(1);
});

// Database should be completely clear before this is ran in order to prevent overlapping documents
// Migrate users

let currentUserPromise = null;

let resolveUser = null;

async function migrateUsers() {
  // let UIDOVERRIDE = "ugbG1GiSHxVEYMDmMeLV9byeukl2";
  let UIDOVERRIDE = undefined;
  let lastId;
  let usersSoFar = 0;
  let totalUsers = 330000;
  let totalCompletionTime = 0;
  let averageCompletionTime = 0;
  try {
    let migrationStats = JSON.parse(
      fs.readFileSync("./migrationStats.txt", "utf8")
    );
    lastId = migrationStats.uid;
    usersSoFar = migrationStats.usersSoFar;
    totalCompletionTime = migrationStats.totalCompletionTime;
    averageCompletionTime = migrationStats.averageCompletionTime;
  } catch (e) {}
  let querySnapshot;
  let limit = 1000;
  do {
    console.log("starting another loop, getting users");
    if (lastId) {
      let lastSnapshot = await db.collection("users").doc(lastId).get();
      querySnapshot = await db
        .collection("users")
        .where("banned", "==", true)
        .orderBy("name")
        .startAfter(lastSnapshot)
        .limit(limit)
        .get();
    } else {
      querySnapshot = await db
        .collection("users")
        .where("banned", "==", true)
        .orderBy("name")
        .limit(limit)
        .get();
    }
    // console.log('start of foreach');
    console.log(`migrating ${querySnapshot.docs.length} users`);
    let fulllog = false;
    for (const userDoc of querySnapshot.docs) {
      let userstart = performance.now();
      currentUserPromise = null;
      currentUserPromise = new Promise((resolve, reject) => {
        resolveUser = resolve;
      });
      let userData = userDoc.data();
      let uid = userDoc.id;
      try {
        let userAuth = await auth.getUser(uid);
        let email = userAuth.email;
        let userCreatedAt = new Date(userAuth.metadata.creationTime).getTime();

        let mongoUser = {
          name: userData.name,
          email: email,
          addedAt: userCreatedAt,
          uid: UIDOVERRIDE ? UIDOVERRIDE : uid,
          oldTypingStats: {},
        };

        if (userData.completedTests)
          mongoUser.oldTypingStats.completedTests = userData.completedTests;
        if (userData.discordId) mongoUser.discordId = userData.discordId;
        if (userData.banned) mongoUser.banned = userData.banned;
        if (userData.verified) mongoUser.verified = userData.verified;
        //banned
        //verified
        if (userData.startedTests)
          mongoUser.oldTypingStats.startedTests = userData.startedTests;
        if (userData.timeTyping)
          mongoUser.oldTypingStats.timeTyping = userData.timeTyping;

        if (userData.personalBests)
          mongoUser.personalBests = userData.personalBests;

        let tagPairs = {};

        let mongoUserTags = [];

        if (fulllog) console.log(`${uid} migrating tags`);
        let tagsSnapshot = await db.collection(`users/${uid}/tags`).get();
        await tagsSnapshot.forEach(async (tagDoc) => {
          let tagData = tagDoc.data();
          let tagId = tagDoc.id;
          let new_id = ObjectID();
          tagPairs[tagId] = new_id;
          let tagtopush = { _id: new_id, name: tagData.name };
          if (tagData.personalBests)
            tagtopush.personalBests = tagData.personalBests;
          mongoUserTags.push(tagtopush);
        });

        mongoUser.tags = mongoUserTags;

        // if (fulllog) console.log(`${uid} migrating config`);
        // if (userData.config) {
        //   await mongoDB()
        //     .collection("configs")
        //     .updateOne(
        //       { uid: UIDOVERRIDE ? UIDOVERRIDE : uid },
        //       {
        //         $set: {
        //           uid: UIDOVERRIDE ? UIDOVERRIDE : uid,
        //           config: userData.config,
        //         },
        //       },
        //       { upsert: true }
        //     );
        // }

        // if (fulllog) console.log(`${uid} migrating presets`);
        // let presetsSnapshot = await db.collection(`users/${uid}/presets`).get();
        // await presetsSnapshot.forEach(async (presetDoc) => {
        //   let presetData = presetDoc.data();
        //   let newpreset = {
        //     uid: UIDOVERRIDE ? UIDOVERRIDE : uid,
        //     name: presetData.name,
        //   };
        //   if (presetData.config) newpreset.config = presetData.config;
        //   await mongoDB().collection("presets").insertOne(newpreset);
        // });

        // let lastcount = 0;
        // let limit = 1000;
        // let lastdoc = "start";
        // let total = 0;
        // let newStats = {
        //   completedTests: 0,
        //   startedTests: 0,
        //   timeTyping: 0,
        // };
        // if (fulllog) console.log(`${uid} migrating results`);
        // do {
        //   if (fulllog) console.log(`${total} so far`);
        //   let resultsSnapshot;
        //   if (lastdoc === "start") {
        //     resultsSnapshot = await db
        //       .collection(`users/${uid}/results`)
        //       .orderBy("timestamp", "desc")
        //       .limit(limit)
        //       .get();
        //   } else {
        //     resultsSnapshot = await db
        //       .collection(`users/${uid}/results`)
        //       .orderBy("timestamp", "desc")
        //       .startAfter(lastdoc)
        //       .limit(limit)
        //       .get();
        //   }
        //   await resultsSnapshot.forEach(async (resultDoc) => {
        //     let resultData = resultDoc.data();
        //     resultData.uid = UIDOVERRIDE ? UIDOVERRIDE : uid;
        //     if (resultData.tags && resultData.tags.length > 0) {
        //       resultData.tags = resultData.tags.map((tag) => tagPairs[tag]);
        //     }
        //     if (!resultData.charStats) {
        //       resultData.charStats = [
        //         resultData.correctChars,
        //         resultData.incorrectChars,
        //       ];
        //     }
        //     delete resultData.correctChars;
        //     delete resultData.incorrectChars;
        //     delete resultData.allChars;
        //     delete resultData.keySpacing;
        //     delete resultData.keyDuration;
        //     delete resultData.theme;
        //     delete resultData.name;

        //     //remove the default fields here
        //     if (resultData.bailedOut === false) delete resultData.bailedOut;
        //     if (resultData.blindMode === false) delete resultData.blindMode;
        //     if (resultData.difficulty === "normal")
        //       delete resultData.difficulty;
        //     if (resultData.funbox === "none") delete resultData.funbox;
        //     if (resultData.language === "english") delete resultData.language;
        //     if (resultData.numbers === false) delete resultData.numbers;
        //     if (resultData.punctuation === false) delete resultData.punctuation;

        //     if (resultData.mode !== "custom") delete resultData.customText;

        //     newStats.completedTests++;
        //     if (resultData.restartCount) {
        //       newStats.startedTests += resultData.restartCount + 1;
        //     } else {
        //       newStats.startedTests++;
        //     }
        //     if (resultData.testDuration) {
        //       newStats.timeTyping += parseFloat(resultData.testDuration);
        //     }
        //     if (resultData.incompleteTestSeconds) {
        //       newStats.timeTyping += resultData.incompleteTestSeconds;
        //     }
        //     await mongoDB().collection("results").insertOne(resultData);
        //   });
        //   lastcount = resultsSnapshot.docs.length;
        //   lastdoc = resultsSnapshot.docs[resultsSnapshot.docs.length - 1];
        //   total += lastcount;
        // } while (lastcount > 0);

        // if (fulllog) console.log(`${uid} migrated ${total} results`);

        // mongoUser.completedTests = newStats.completedTests;
        // mongoUser.startedTests = newStats.startedTests;
        // mongoUser.timeTyping = newStats.timeTyping;

        if (fulllog) console.log(`${uid} migrating user doc`);
        await mongoDB()
          .collection("users")
          .updateOne(
            { uid: UIDOVERRIDE ? UIDOVERRIDE : uid },
            {
              $set: mongoUser,
            },
            { upsert: true }
          );

        console.log(`${uid} migrated \t\t ${userData.name} \t\t`);
        fs.appendFileSync(
          "log_success.txt",
          `${uid}\t\t${userData.name}\t\t`,
          "utf8"
        );
      } catch (err) {
        console.log(`${uid} failed`);
        console.log(err);
        fs.appendFileSync(
          "log_failed.txt",
          `${uid}\t\t${err.message}\n`,
          "utf8"
        );
      }
      lastId = uid;
      let userend = performance.now();
      let time = (userend - userstart) / 1000;
      totalCompletionTime += time;
      // console.log(`${uid} took ${time} seconds`);
      averageCompletionTime = totalCompletionTime / usersSoFar + 1;
      usersSoFar++;
      let estimateSecondsLeft =
        averageCompletionTime * (totalUsers - usersSoFar);
      console.log(
        `${usersSoFar}/${totalUsers} users | estimated ${secondsToString(
          estimateSecondsLeft,
          true
        )} left`
      );

      fs.writeFileSync(
        "migrationStats.txt",
        JSON.stringify({
          uid,
          usersSoFar,
          totalCompletionTime,
          averageCompletionTime,
        }),
        "utf8"
      );

      resolveUser();

      // console.log(userData);
      //   let newUser;
      //   try{
      //     let data = userDoc.data();
      //     data._id = userDoc.id;
      //     newUser = new User(data);
      //     newUser.uid = userDoc.id;
      //     newUser.globalStats = {
      //       started: userDoc.data().startedTests,
      //       completed: userDoc.data().completedTests,
      //       time: userDoc.data().timeTyping,
      //     };
      //     let tagIdDict = {};
      //     let tagsSnapshot = await db.collection(`users/${userDoc.id}/tags`).get();
      //     tagsSnapshot.forEach((tagDoc) => {
      //       let formattedTag = tagDoc.data();
      //       formattedTag._id = mongoose.Types.ObjectId(); //generate new objectId
      //       tagIdDict[tagDoc.id] = formattedTag._id; //save pair of ids in memory to determine what to set new id as in result tags
      //       newUser.tags.push(formattedTag);
      //       console.log(`Tag ${tagDoc.id} saved for user ${userCount}`);
      //     });
      //     let resultsSnapshot = await db.collection(`users/${userDoc.id}/results`).get();
      //     let resCount = 1;
      //     resultsSnapshot.forEach((result) => {
      //       let formattedResult = result.data();
      //       if(formattedResult.tags != undefined){
      //         formattedResult.tags.forEach((tag, index) => {
      //           if (tagIdDict[tag])
      //             formattedResult.tags[index] = tagIdDict[tag];
      //         });
      //       }
      //       newUser.results.push(formattedResult);
      //       console.log(`Result ${resCount} saved for user ${userCount}`);
      //       resCount++;
      //     });
      //     newUser.results.sort((a, b) => {
      //       return a.timestamp - b.timestamp;
      //     });
      //     let presetsSnapshot = await db.collection(`users/${userDoc.id}/presets`).get();
      //     presetsSnapshot.forEach((preset) => {
      //       newUser.presets.push(preset.data());
      //     });
      //     await newUser.save();
      //     console.log(`User ${userCount} (${newUser.uid}) saved`);
      //     userCount++;
      //   }catch(e){
      //     // throw e;
      //     console.log(`User ${userCount} (${newUser.uid}) failed: ${e.message}`);
      //     userCount++;
      //   }
    }
  } while (querySnapshot.docs.length > 0);

  console.log("Migration complete");
  // console.log('end of foreach');
}
// //not tested because I can't get leaderboards to work on my fork for some reason
// db.collection("leaderboards")
//   .get()
//   .then((leaderboardsSnapshot) => {
//     leaderboardsSnapshot.forEach((lbDoc) => {
//       let newLb = new Leaderboard(lbDoc.data());
//       newLb.save();
//     });
//   });

// //migrate bot-commands
// db.collection("bot-commands")
//   .get()
//   .then((botCommandsSnapshot) => {
//     botCommandsSnapshot.forEach((bcDoc) => {
//       let newBotCommand = new BotCommand(bcDoc.data());
//       newBotCommand.save();
//     });
//   });

//migrate public stat
async function migratePublicStats() {
  db.collection("public")
    .doc("stats")
    .get()
    .then((ret) => {
      let stats = ret.data();
      mongoDB()
        .collection("public")
        .updateOne(
          { type: "stats" },
          {
            $set: {
              completedTests: stats.completedTests,
              startedTests: stats.startedTests,
              timeTyping: stats.timeTyping,
            },
          },
          { upsert: true }
        );
    });
}

async function init() {
  await connectDB();
  // await migratePublicStats();
  await migrateUsers();
  // process.exit(1);
}

function secondsToString(sec, full = false) {
  const hours = Math.floor(sec / 3600);
  const minutes = Math.floor((sec % 3600) / 60);
  const seconds = Math.round((sec % 3600) % 60);
  let hoursString;
  let minutesString;
  let secondsString;
  hours < 10 ? (hoursString = "0" + hours) : (hoursString = hours);
  minutes < 10 ? (minutesString = "0" + minutes) : (minutesString = minutes);
  seconds < 10 && (minutes > 0 || hours > 0 || full)
    ? (secondsString = "0" + seconds)
    : (secondsString = seconds);

  let ret = "";
  if (hours > 0 || full) ret += hoursString + ":";
  if (minutes > 0 || hours > 0 || full) ret += minutesString + ":";
  ret += secondsString;
  return ret;
}

init();