import { UserOutlined } from "@ant-design/icons";
import { Avatar, Badge, Tooltip } from "antd";
import { createContext, useEffect, useRef, useState } from "react";
import { useNavigate } from "react-router-dom";
import { Buffer } from "buffer";

/**
 * constants
 */
export const Constants = {
  COLORS: {
    PRIMARY: "#e67e22",
    SECONDARY: "#9b59b6",
    ICON_INFO: "#08c",
  },
  TEXT_EMPTY_PLACEHOLDER: "-/-",
  API_ADDRESS: "http://localhost:8080/v1",
  STATIC_CONTENT_ADDRESS: "http://localhost:8080/",
  WS_ADDRESS: "ws://localhost:8080/ws",
  ROUTE_PATHS: {
    GROUP_TASKS: "/group-tasks",
    GROUP_TASKS_VIEW: "/group-tasks/",
  },
  GROUP_TASKS_STATUS: {
    FINISHED: 1,
    RUNNING: 2,
    CANCELED: 3,
    FAILED: 4,
    INPUT_REQUIRED: 5,
  },
  GLOBALS: {
    MIN_USERNAME_LENGTH: 2,
    MAX_USERNAME_LENGTH: 20,
    MIN_PASSWORD_LENGTH: 6,
    MAX_PASSWORD_LENGTH: 64,
  },
  MAX_AVATAR_SIZE: 5 * 1024 * 1024,
  ACCEPTED_FILE_TYPES: ["image/png", "image/jpeg", "image/jpg"],
  GROUP_TASK_LOCKED_TIME: 3 * 1000,
};

/*
This ID is needed because the message is sent to all clients connected to the backend server when a task is locked and unlocked.
With this ID the client checks if the respective browser tab of the user is the initiator of the lock.
*/
export const GroupTasksStepsLockedAndUserUpdateInputValueRememberId =
  window.crypto.randomUUID();

/**
 * user session
 */
export function UseUserSession() {
  const getUserSession = () => {
    return getUserSessionFromLocalStorage();
  };

  const [userSession, setUserSession] = useState(getUserSession());

  const saveUserSession = (session) => {
    setUserSession(session);

    if (session === undefined) {
      localStorage.removeItem("session");
    } else {
      localStorage.setItem("session", JSON.stringify(session));
    }
  };

  return {
    setUserSession: saveUserSession,
    userSession,
  };
}

export function getUserSessionFromLocalStorage() {
  return JSON.parse(localStorage.getItem("session"));
}

/**
 * websocket
 */
let l = "loading...";

let webSocketContextPreview = {
  User: {
    Id: "",
    Username: l,
    Email: l,
    Sessions: [],
  },
  AllUsers: [],
  ConnectionBadgeStatus: "error",
  ConnectedWebSocketUsersCount: 0,
  CategoryGroups: [],
  GroupTasks: [],
  GroupTasksSteps: [],
  Scanners: [],
};

export const WebSocketContext = createContext(webSocketContextPreview);

// commands received from the backend server
const ReceivedMessagesCommands = {
  InitUserSocketConnection: 1,
  UpdateConnectedUsers: 2,
  NewGroupTaskStarted: 3,
  NewGroupTaskStep: 4,
  UpdateGroupTaskStep: 5,
  UpdateGroupTask: 6,
  ReloadingGroupTasks: 7,
  GroupTasksReloaded: 8,
  UpdateUserSessions: 9,
  UpdateAllUsersUserAvatar: 10,
  NewScanner: 11,
  DeleteScanner: 12,
  UpdateScannerUsedByUserId: 13,
  ScanResult: 14,
  UpdateScannerLastUsed: 15,
  TaskLocked: 16,
  TaskUnlocked: 17,
};

// commands sent to the backend server
export const SentMessagesCommands = {
  StartGroupTasks: 1,
  TaskFailedTryAgainRunTaskStep: 2,
  TaskContinueTaskStep: 3,
  ReloadGroupTasks: 4,
  TaskLocking: 5,
};

export function WebSocketProvider({
  children,
  userSession,
  setUserSession,
  notificationApi,
}) {
  const [isReady, setIsReady] = useState(false);
  const [connectionBadgeStatus, setConnectionBadgeStatus] = useState(
    webSocketContextPreview.ConnectionBadgeStatus
  );
  const [connectedWebSocketUsersCount, setConnectedWebSocketUsersCount] =
    useState(0);
  const [user, setUser] = useState(webSocketContextPreview.User);
  const [allUsers, setAllUsers] = useState(webSocketContextPreview.AllUsers);
  const [categoryGroups, setCategoryGroups] = useState(
    webSocketContextPreview.CategoryGroups
  );
  // these are all group tasks that are then filtered and displayed in the respective tables for the category
  const [groupTasks, setGroupTasks] = useState([]);
  const [groupTasksSteps, setGroupTasksSteps] = useState([]);
  const [scanners, setScanners] = useState([]);
  const navigate = useNavigate();
  const StartGroupTasksOpenModalRememberIdRef = useRef(null);

  const ws = useRef(null);

  const connect = () => {
    ws.current = new WebSocket(Constants.WS_ADDRESS + "?auth=" + userSession);

    ws.current.onopen = () => {
      console.log("connected");
      setConnectionBadgeStatus("success");
      setIsReady(true);
    };

    ws.current.onmessage = (event) => {
      const data = JSON.parse(event.data);
      console.log("received message", data);

      const cmd = data.Cmd;
      const body = data.Body;

      switch (cmd) {
        case ReceivedMessagesCommands.InitUserSocketConnection:
          setUser(body.User);
          setAllUsers(body.AllUsers);
          setCategoryGroups(body.CategoryGroups);
          setGroupTasks(body.GroupTasks);
          setGroupTasksSteps(body.GroupTasksSteps);
          if (body.Scanners !== null) setScanners(body.Scanners);

          localStorage.setItem("userId", body.User.Id);
          break;
        case ReceivedMessagesCommands.UpdateConnectedUsers:
          setConnectedWebSocketUsersCount(body.WebSocketUsersCount);
          setAllUsers((arr) => {
            const newArr = [...arr];

            newArr[
              arr.findIndex((arr1) => arr1.Id === body.UserId)
            ].ConnectionStatus = body.ConnectionStatus;

            return newArr;
          });
          break;
        case ReceivedMessagesCommands.NewGroupTaskStarted:
          setGroupTasks((arr) => [...arr, body]);

          if (
            body.RememberId === StartGroupTasksOpenModalRememberIdRef.current
          ) {
            navigate(`${Constants.ROUTE_PATHS.GROUP_TASKS}/${body.Id}`);
          }
          break;
        case ReceivedMessagesCommands.NewGroupTaskStep:
          setGroupTasksSteps((arr) => [...arr, body]);
          break;
        case ReceivedMessagesCommands.UpdateGroupTaskStep:
          setGroupTasksSteps((arr) => {
            const newArr = [...arr];

            newArr[arr.findIndex((arr1) => arr1.Id === body.Id)] = body;

            return newArr;
          });
          break;
        case ReceivedMessagesCommands.UpdateGroupTask:
          setGroupTasks((arr) => {
            const newArr = [...arr];

            newArr[arr.findIndex((arr1) => arr1.Id === body.Id)] = body;

            return newArr;
          });
          break;
        case ReceivedMessagesCommands.ReloadingGroupTasks:
          notificationApi["warning"]({
            message: `Group ${body} is reloading`,
            duration: 2,
          });
          break;
        case ReceivedMessagesCommands.GroupTasksReloaded:
          setCategoryGroups((arr) => {
            const newArr = [...arr];

            newArr[
              arr.findIndex((arr1) => arr1.category === body.Category)
            ].groups = body.UpdatedGroups;

            return newArr;
          });

          notificationApi["info"]({
            message: `Group ${body.Category} reloaded`,
            duration: 2,
          });
          break;
        case ReceivedMessagesCommands.UpdateUserSessions:
          setUser((arr) => ({ ...arr, Sessions: body }));
          break;
        case ReceivedMessagesCommands.UpdateAllUsersUserAvatar:
          setAllUsers((arr) => {
            const newArr = [...arr];

            newArr[arr.findIndex((arr1) => arr1.Id === body.UserId)].Avatar =
              body.Avatar;

            return newArr;
          });
          break;
        case ReceivedMessagesCommands.NewScanner:
          setScanners((arr) => [...arr, body]);
          break;
        case ReceivedMessagesCommands.DeleteScanner:
          setScanners((arr) => arr.filter((arr) => arr.Id !== body.Id));
          break;
        case ReceivedMessagesCommands.UpdateScannerUsedByUserId:
          setScanners((arr) => {
            const newArr = [...arr];

            newArr[
              arr.findIndex((arr1) => arr1.Id === body.ScannerId)
            ].UsedByUserId = body.UsedByUserId;

            return newArr;
          });
          break;
        case ReceivedMessagesCommands.ScanResult:
          const decodedScanResult = Buffer.from(body, "base64").toString();

          if (decodedScanResult === "" || decodedScanResult === null) {
            notificationApi["error"]({
              message: `Failed to decode scan result`,
              description: "See in developer console",
            });

            console.error(
              "Received scan result: ",
              body,
              "Decoded result: ",
              decodedScanResult
            );
            break;
          }

          notificationApi["info"]({
            message: `Scan Result`,
            description: Buffer.from(body, "base64").toString(),
          });

          new Audio(
            `${Constants.STATIC_CONTENT_ADDRESS}sounds/scan_result.mp3`
          ).play();

          break;
        case ReceivedMessagesCommands.UpdateScannerLastUsed:
          setScanners((arr) => {
            const newArr = [...arr];

            newArr[
              arr.findIndex((arr1) => arr1.Id === body.ScannerId)
            ].LastUsed = body.LastUsed;

            return newArr;
          });
          break;
        case ReceivedMessagesCommands.TaskLocked:
          if (
            body.rememberId ===
            GroupTasksStepsLockedAndUserUpdateInputValueRememberId
          )
            break;

          console.log("body task locked", body);

          setGroupTasksSteps((arr) => {
            const newArr = [...arr];

            newArr[
              arr.findIndex(
                (arr1) =>
                  arr1.GroupTasksId === body.groupTaskId &&
                  arr1.Step === body.step
              )
            ].LockedByUserId = body.lockedByUserId;

            return newArr;
          });

          // update input value
          // html based DOM manipulation
          const foundInput = document.getElementById(body.element);

          console.log("here", foundInput);

          if (foundInput) {
            // this timeout is needed because the previous useState for the lockedByUserId takes some milliseconds to complete
            setTimeout(() => setNativeValue(foundInput, body.value), 50);
          }

          // update group task step as html based DOM manipulation only works if user has no other modal open
          setGroupTasksSteps((arr) => {
            const newArr = [...arr];

            const stepIndex = arr.findIndex(
              (arr1) =>
                arr1.GroupTasksId === body.groupTaskId &&
                arr1.Step === body.step
            );

            if (stepIndex === -1) return newArr;

            let inputs = [];

            if (newArr[stepIndex].Inputs !== "") {
              inputs = JSON.parse(newArr[stepIndex].Inputs);
            }

            let parameterFound = false;

            for (let i = 0; i < inputs.length; i++) {
              if (inputs[i].parameterName === body.parameterName) {
                inputs[i].value = body.value;
                parameterFound = true;
                break;
              }
            }

            if (!parameterFound) {
              let obj = {};

              obj["parameterName"] = body.parameterName;
              obj["value"] = body.value;

              inputs.push(obj);
            }

            newArr[stepIndex].Inputs = JSON.stringify(inputs);

            return newArr;
          });

          break;
        case ReceivedMessagesCommands.TaskUnlocked:
          if (
            body.rememberId ===
            GroupTasksStepsLockedAndUserUpdateInputValueRememberId
          )
            break;

          setGroupTasksSteps((arr) => {
            const newArr = [...arr];

            newArr[
              arr.findIndex(
                (arr1) =>
                  arr1.GroupTasksId === body.GroupTaskId &&
                  arr1.Step === body.Step
              )
            ].LockedByUserId = "";

            return newArr;
          });
          break;
        /*case ReceivedMessagesCommands.UpdateGroupTaskStepUserInputValue:
          if (
            body.rememberId ===
            GroupTasksStepsLockedAndUserUpdateInputValueRememberId
          )
            break;

          // html based DOM manipulation
          const foundInput = document.getElementById(body.element);

          if (foundInput) {
            setNativeValue(foundInput, body.value);
          }

          // update group task step as html based DOM manipulation only works if user has no other modal open
          setGroupTasksSteps((arr) => {
            const newArr = [...arr];

            const stepIndex = arr.findIndex(
              (arr1) =>
                arr1.GroupTasksId === body.groupTaskId &&
                arr1.Step === body.step
            );

            if (stepIndex === -1) return newArr;

            let inputs = [];

            if (newArr[stepIndex].Inputs !== "") {
              inputs = JSON.parse(newArr[stepIndex].Inputs);
            }

            let parameterFound = false;

            for (let i = 0; i < inputs.length; i++) {
              if (inputs[i].parameterName === body.parameterName) {
                inputs[i].value = body.value;
                parameterFound = true;
                break;
              }
            }

            if (!parameterFound) {
              let obj = {};

              obj["parameterName"] = body.parameterName;
              obj["value"] = body.value;

              inputs.push(obj);
            }

            newArr[stepIndex].Inputs = JSON.stringify(inputs);

            return newArr;
          });
          break;*/

        default:
          console.error("unknown command", cmd);
          break;
      }
    };

    ws.current.onclose = (event) => {
      setIsReady(false);
      setConnectionBadgeStatus("error");
      console.log("closed", event);

      // custom code defined by the backend server
      if (event.code === 4001 || event.code === 4002) {
        //Unauthorized || SessionClosed

        setUserSession();
        window.location.href = "/";
        return;
      }

      if (event.reason.code === 1005) return;

      console.log("reconnecting...");

      setTimeout(() => connect(), 1000);
    };
  };

  useEffect(() => {
    connect();

    //return () => socket.close();
    return () => ws.current.close();
  }, []);

  const SendSocketMessage = (cmd, body) => {
    if (isReady) {
      ws.current.send(JSON.stringify({ Cmd: cmd, Body: body }));
    } else {
      console.log("websocket not ready");
    }
  };

  return (
    <WebSocketContext.Provider
      value={{
        ConnectionBadgeStatus: connectionBadgeStatus,
        ConnectedWebSocketUsersCount: connectedWebSocketUsersCount,
        CategoryGroups: categoryGroups,
        GroupTasks: groupTasks,
        User: user,
        AllUsers: allUsers,
        Scanners: scanners,
        SendSocketMessage: SendSocketMessage,
        GroupTasksSteps: groupTasksSteps,
        setGroupTasksSteps: setGroupTasksSteps,
        StartGroupTasksOpenModalRememberIdRef:
          StartGroupTasksOpenModalRememberIdRef,
      }}
    >
      {children}
    </WebSocketContext.Provider>
  );
}

// https://stackoverflow.com/a/52486921
function setNativeValue(element, value) {
  let lastValue = element.value;
  element.value = value;
  let event = new Event("input", { target: element, bubbles: true });
  // React 15
  event.simulated = true;
  // React 16
  let tracker = element._valueTracker;
  if (tracker) {
    tracker.setValue(lastValue);
  }
  element.dispatchEvent(event);
}

export function FormatDatetime(datetime) {
  if (datetime === "0001-01-01T00:00:00Z") {
    return Constants.TEXT_EMPTY_PLACEHOLDER;
  }

  return new Date(datetime).toLocaleString("de-DE");
}

export function GetDuration(startTime, endTime) {
  if (endTime === "0001-01-01T00:00:00Z") {
    return Constants.TEXT_EMPTY_PLACEHOLDER;
  }

  const diff = Math.abs(new Date(startTime) - new Date(endTime));

  if (diff === 0) {
    return "0ms";
  }

  const milliseconds = diff % 1000;
  const seconds = Math.floor(diff / 1000);
  const minutes = Math.floor(seconds / 60);
  const hours = Math.floor(minutes / 60);
  const days = Math.floor(hours / 24);

  let result = "";

  if (days > 0) {
    result += days + "d ";
  }

  if (hours > 0) {
    result += (hours % 24) + "h ";
  }

  if (minutes > 0) {
    result += (minutes % 60) + "m ";
  }

  if (seconds > 0) {
    result += (seconds % 60) + "s ";
  }

  if (milliseconds > 0) {
    result += milliseconds + "ms";
  }

  return result.trim();
}

export function getConnectionStatusItem(connectionStatus) {
  return connectionStatus === 0 ? (
    <Badge status="error" text="Offline" />
  ) : (
    <Badge status="success" text="Online" />
  );
}

export function MyAvatar({
  avatarWidth,
  avatar,
  tooltip,
  tooltipTitle,
  allUsers,
  userId,
}) {
  const MyDefaultAvatar = () => {
    return <Avatar size={avatarWidth} icon={<UserOutlined />} />;
  };

  if (avatar === undefined || avatar === null) {
    if (allUsers !== undefined && userId !== undefined) {
      const user = allUsers.find((u) => u.Id === userId);

      if (user === undefined) return <MyDefaultAvatar />;

      avatar = user.Avatar;
      tooltipTitle = user.Username;
    } else {
      return <MyDefaultAvatar />;
    }
  }

  const MyAvat = () => {
    return (
      <Avatar
        size={avatarWidth}
        src={Constants.STATIC_CONTENT_ADDRESS + "avatars/" + avatar}
      />
    );
  };

  if (tooltip) {
    return (
      <Tooltip placement="top" trigger="hover" title={tooltipTitle}>
        <>
          <MyAvat />
        </>
      </Tooltip>
    );
  }

  return <MyAvat />;
}

export function getUserId() {
  return localStorage.getItem("userId");
}