import * as sdk from "matrix-js-sdk";
import fetch from "node-fetch";
import process from "process";
import fs from "fs";
import "dotenv/config";
import { JsonDB, Config } from "node-json-db";
import { TimetableClient } from "./timetable.js";

const authPassword = process.env.AUTH_PASSWORD;

const db = new JsonDB(new Config("data/data", true, true, "/"));
const timetable = new TimetableClient(
  process.env.TIMETABLE_ENDPOINT,
  process.env.TIMETABLE_TOKEN
);

await db.push("/rooms", {}, false);

// Login
const userId = process.env.MATRIX_USER;
const client = sdk.createClient({
  baseUrl: process.env.MATRIX_URL,
  accessToken: process.env.MATRIX_TOKEN,
  userId: userId,
  fetchFn: fetch,
});

const displayName = process.env.MATRIX_DISPLAYNAME || "Timetable V2";
(async () => {
  const profileInfo = await client.getProfileInfo(userId);
  if (profileInfo.displayname != displayName) {
    await client.setProfileInfo("displayname", {
      displayname: displayName,
    });
    const file = fs.readFileSync("./images/profile-picture.png");
    const content = await client.uploadContent(file, {
      name: "profile-picture.png",
      type: "image/png",
    });
    await client.setProfileInfo("avatar_url", {
      avatar_url: content.content_uri,
    });
  }
})();

client.once("sync", function (state) {
  if (state === "PREPARED") {
    console.log("sync finished");
  }
});

// Auto-join invited rooms
client.on("RoomMember.membership", function (_, member) {
  if (member.membership === "invite" && member.userId === userId) {
    client
      .joinRoom(member.roomId)
      .then(function () {
        console.log("Auto-joined %s", member.roomId);
      })
      .catch(() => {
        client.leave(member.roomId);
      });
  }
});

function formatUpdateMessage(update) {
  let message = "";
  if (update.type == "addition") message += "🆕";
  else if (update.type == "deletion") message += "🗑";
  else if (update.type == "change") message += "✏";

  if (update.type == "addition" || update.type == "deletion") {
    message += " ";
    if (update.change.type == "cancellation") message += "🚫";
    else message += "📑";
  }
  message += ` <b>${update.lesson}th Lesson</b><br><ul>\n`;

  if (update.type == "addition" || update.type == "deletion") {
    message += `\n<li><b>Subject:</b> ${
      update.change.change.subject || "Unknown"
    }`;
    if (update.change.change.teacher) {
      message += `</li>\n<li><b>Teacher:</b> <del>${
        update.change.teacher || "Unknown"
      }</del> ${update.change.change.teacher}`;
    } else {
      message += `</li>\n<li><b>Teacher:</b> ${
        update.change.teacher || "Unknown"
      }`;
    }
    message += `</li>\n<li><b>Room:</b> ${
      update.change.change.room || "Unknown"
    }`;
    if (update.change.notes) {
      message += `</li>\n<li><b>Notes:</b></li>\n${update.change.notes}`;
    }
  } else {
    for (const change of Object.keys(update.change)) {
      const changeValue = update.change[change];
      message += `<br><li>\n${
        change.charAt(0).toUpperCase() + change.slice(1)
      }: <del>${changeValue.before}</del> ${changeValue.after}</li>`;
    }
  }

  return message;
}

// Check for timetable updates
setInterval(async () => {
  const history = await timetable.getUpdates();
  const lastCheck = await db.getObjectDefault("/lastTimetableUpdate", 0);
  const updates = history.filter((entry) => entry.updatedAt > lastCheck);

  await db.push("/lastTimetableUpdate", new Date().getTime());

  const rooms = await db.getData("/rooms");
  for (const update of updates) {
    for (const roomId of Object.keys(rooms)) {
      const room = rooms[roomId];
      if (!update.class.includes(room.filter)) continue;
      console.log(update);

      let message = formatUpdateMessage(update);
      client.sendHtmlMessage(roomId, plainText(message), message);
    }
  }
}, process.env.TIMETABLE_INTERVAL || 1000 * 60);

// Handle events
client.on("Room.timeline", async function (event, room) {
  if (event.getLocalAge() > 5000) return;
  if (event.event.sender == userId) return;

  const senderPowerLevel = client
    .getRoom(room.roomId)
    .getMember(event.event.sender).powerLevel;

  if (senderPowerLevel <= 40) {
    if (
      event.getType() == "m.room.message" &&
      event.event.content.body == "help"
    ) {
      client.sendTextMessage(
        room.roomId,
        "⛔ You need at least powerlevel 40 moderate this bot"
      );
    }
    return;
  }

  if (
    !(await db.getObjectDefault(`/authStatus/${room.roomId}`, false)) &&
    authPassword
  ) {
    if (event.getType() !== "m.room.message") return;

    if (!event.event.content.body.startsWith("login")) {
      const response =
        "🔐 Not authenticated! Use <code>login [password]</code> to login";
      client.sendHtmlMessage(room.roomId, plainText(response), response);
      return;
    }

    if (event.event.content.body.split("login ")[1] == authPassword) {
      await db.push(`/authStatus/${room.roomId}`, true);
      client.sendTextMessage(room.roomId, "🔑 This room is now authenticated");
      client
        .redactEvent(room.roomId, event.event.event_id, undefined, {
          reason: "Redacted login password",
        })
        .catch((e) => {
          console.warn("Could not redact password in " + room.roomId);
        });
      return;
    } else {
      client.sendTextMessage(room.roomId, "❌ Invalid password");
      return;
    }
  }

  try {
    if (event.getType() === "m.room.message") {
      await handleMessage(event, room.roomId);
    } else if (
      event.getType() === "m.reaction" ||
      event.getType() === "m.room.redaction"
    ) {
      await handleReaction(event, room.roomId);
    }
  } catch (e) {
    client.sendTextMessage(
      room.roomId,
      "⛔ Your command failed executing! Please try again"
    );
  }
});

function plainText(message) {
  return message.replace("<li>", "- ").replace(/<[^>]+>/g, "");
}

function sendReaction(room, toEvent, text) {
  client.sendEvent(room, "m.reaction", {
    "m.relates_to": {
      rel_type: "m.annotation",
      event_id: toEvent,
      key: text,
    },
  });
}

async function handleMessage(event, room) {
  const body = event.event.content.body;
  const sender = event.event.sender;

  const userState = await db.getObjectDefault(`/rooms/${room}/state`);

  if (!userState) {
    if (body == "help") {
      // Send help message
      const helpMessage = `<b>Available commands</b>:<ul>
<li> <code>help</code>: List available commands </li>
<li> <code>info</code>: Get information about the current room's configuration </li>
<li> <code>filter [class (eg. 10c)]</code>: Set the class to filter for. Use only filter available in the timetable v2 app.</li>
<li> <code>timetable</code>: Set your timetable</li>
<li> <code>groups</code>: Configure your timetable groups <i>[Not implemented yet]</i></li>
<li> <code>reset</code>: Reset the configuration for this room</li>
<li> <code>logout</code>: Logout and reset the configuration for room</li>
`;
      client.sendHtmlMessage(room, plainText(helpMessage), helpMessage);
    } else if (body == "info") {
      // Send room information
      const roomData = await db.getObjectDefault(`/rooms/${room}`);
      if (!roomData) {
        client.sendTextMessage(
          room,
          "⛔ This room has no configuration data yet"
        );
        return;
      }
      const response = `<b>Current Room Configuration</b>:
<br>Filter: <code>${roomData.filter || "None"}</code>
<br>Timetable ID: <code>${roomData.timetable || "Not set"}</code>
<br>Timetable Groups: <code>${(roomData.groups || []).join(", ")}</code>`;
      client.sendHtmlMessage(room, plainText(response), response);
    } else if (body.startsWith("filter ")) {
      // Set filtering
      const filter = body.split(" ")[1].toLowerCase();
      const response = `👍 Now filtering for <code>${filter}</code>`;
      await db.push(`/rooms/${room}/filter`, filter);
      client.sendHtmlMessage(room, plainText(response), response);
    } else if (body == "timetable") {
      // Timetable
      if (!(await db.getObjectDefault(`/rooms/${room}/filter`))) {
        client.sendTextMessage(room, "⛔ You need to configure a filter first");
        return;
      }
      // Query timetables
      const timetables = await timetable.getTimetables(
        await db.getData(`/rooms/${room}/filter`)
      );
      await db.push(`/rooms/${room}/state`, "timetable");
      let response = `🛠 Which timetable do you want to use?<ul>\n`;
      // Build response message
      for (const timetable of timetables.timetables) {
        response += `<li><code>${timetable.id}</code>: ${timetable.title}</li>\n`;
      }
      client.sendHtmlMessage(room, plainText(response), response);
    } else if (body == "groups") {
      if (!(await db.getObjectDefault(`/rooms/${room}/timetable`))) {
        client.sendTextMessage(room, "⛔ You need to select a timetable first");
        return;
      }
      // Timetable groups
      await db.push(`/rooms/${room}/state`, "groups");
      await db.push(`/rooms/${room}/stateData/sender`, event.sender.userId);
      const groups = await timetable.getGroups(
        await db.getData(`/rooms/${room}/filter`),
        await db.getData(`/rooms/${room}/timetable`)
      );
      let response = `🛠 Set your timetable groups by reacting with the correct group. React with ✅ to confirm your selection.`;
      response +=
        "<br>\n<b>Warning:</b> Timetable group support is WIP. You can configure your timetable groups, but they will not be taken into account while processing updates just yet. ";
      const message = await client.sendHtmlMessage(
        room,
        plainText(response),
        response
      );
      for (const group of groups) {
        sendReaction(room, message.event_id, group);
      }
      sendReaction(room, message.event_id, "✅");
    } else if (body == "reset") {
      // Reset room
      await db.delete(`/rooms/${room}`);
      const response = "⚠ The configuration for this room was reset!";
      client.sendHtmlMessage(room, plainText(response), response);
    } else if (body == "logout") {
      await db.delete(`/rooms/${room}`);
      await db.delete(`/authStatus/${room}`);
      const response = "🔐 This room was logged out!";
      client.sendHtmlMessage(room, plainText(response), response);
    } else {
      const response =
        "Unknown command! Type <code>help</code> for a list of valid commands";
      client.sendHtmlMessage(room, plainText(response), response);
    }
  } else {
    // If user is in setup mode
    if (body == "abort") {
      await db.delete(`/rooms/${room}/state`);
      const response = `❌ Aborted current action`;
      client.sendHtmlMessage(room, plainText(response), response);
    } else if (userState == "timetable") {
      const timetable = parseInt(body);
      if (!timetable) {
        client.sendTextMessage(room, "Please enter the timetable id!");
        return;
      }
      await db.push(`/rooms/${room}/timetable`, timetable);
      await db.delete(`/rooms/${room}/state`);
      const response = `✅ Now using timetable <code>${timetable}</code>`;
      client.sendHtmlMessage(room, plainText(response), response);
    } else {
      const response =
        "⚠ You are currently in setup mode. Complete the setup or type <code>abort</code> to execute other commands.";
      client.sendHtmlMessage(room, plainText(response), response);
    }
  }
}

async function handleReaction(event, room) {
  const state = await db.getObjectDefault(`/rooms/${room}/state`);
  if (state == "groups") {
    const stateData = await db.getObjectDefault(`/rooms/${room}/stateData`);
    if (event.sender.userId != stateData.sender) return;
    if (event.event.content["m.relates_to"].key == "✅") {
      if (!stateData.groups) stateData.groups = {};
      await db.push(`/rooms/${room}/groups`, Object.values(stateData.groups));
      await db.delete(`/rooms/${room}/stateData`);
      await db.delete(`/rooms/${room}/state`);
      const response = `✅ Now using timetable groups <code>${Object.values(
        stateData.groups
      ).join(", ")}</code>`;
      client.sendHtmlMessage(room, plainText(response), response);
    } else if (event.getType() === "m.reaction") {
      await db.push(
        `/rooms/${room}/stateData/groups/${event.event.event_id}`,
        event.event.content["m.relates_to"].key
      );
    } else {
      await db.delete(`/rooms/${room}/stateData/groups/${event.event.redacts}`);
    }
  }
}

client.startClient(0);

process.on("SIGINT", () => {
  console.info("Interrupted");
  process.exit(0);
});