import { io } from "socket.io-client";
import { useToast } from "vue-toastification";
import jwt_decode from "jwt-decode";
const toast = useToast();

let socket;

const noSocketIOPages = [
    "/status-page",
    "/status",
    "/"
];

export default {

    data() {
        return {
            info: { },
            socket: {
                token: null,
                firstConnect: true,
                connected: false,
                connectCount: 0,
                initedSocketIO: false,
            },
            remember: (localStorage.remember !== "0"),
            allowLoginDialog: false,        // Allowed to show login dialog, but "loggedIn" have to be true too. This exists because prevent the login dialog show 0.1s in first before the socket server auth-ed.
            loggedIn: false,
            monitorList: { },
            heartbeatList: { },
            importantHeartbeatList: { },
            avgPingList: { },
            uptimeList: { },
            tlsInfoList: {},
            notificationList: [],
            connectionErrorMsg: "Cannot connect to the socket server. Reconnecting...",
        };
    },

    created() {
        window.addEventListener("resize", this.onResize);
        this.initSocketIO();
    },

    methods: {

        initSocketIO(bypass = false) {
            // No need to re-init
            if (this.socket.initedSocketIO) {
                return;
            }

            // No need to connect to the socket.io for status page
            if (! bypass && noSocketIOPages.includes(location.pathname)) {
                return;
            }

            this.socket.initedSocketIO = true;

            let protocol = (location.protocol === "https:") ? "wss://" : "ws://";

            let wsHost;
            const env = process.env.NODE_ENV || "production";
            if (env === "development" || localStorage.dev === "dev") {
                wsHost = protocol + location.hostname + ":3001";
            } else {
                wsHost = protocol + location.host;
            }

            socket = io(wsHost, {
                transports: ["websocket"],
            });

            socket.on("info", (info) => {
                this.info = info;
            });

            socket.on("setup", (monitorID, data) => {
                this.$router.push("/setup");
            });

            socket.on("autoLogin", (monitorID, data) => {
                this.loggedIn = true;
                this.storage().token = "autoLogin";
                this.allowLoginDialog = false;
            });

            socket.on("monitorList", (data) => {
                // Add Helper function
                Object.entries(data).forEach(([monitorID, monitor]) => {
                    monitor.getUrl = () => {
                        try {
                            return new URL(monitor.url);
                        } catch (_) {
                            return null;
                        }
                    };
                });
                this.monitorList = data;
            });

            socket.on("notificationList", (data) => {
                this.notificationList = data;
            });

            socket.on("heartbeat", (data) => {
                if (! (data.monitorID in this.heartbeatList)) {
                    this.heartbeatList[data.monitorID] = [];
                }

                this.heartbeatList[data.monitorID].push(data);

                if (this.heartbeatList[data.monitorID].length >= 150) {
                    this.heartbeatList[data.monitorID].shift();
                }

                // Add to important list if it is important
                // Also toast
                if (data.important) {

                    if (data.status === 0) {
                        toast.error(`[${this.monitorList[data.monitorID].name}] [DOWN] ${data.msg}`, {
                            timeout: false,
                        });
                    } else if (data.status === 1) {
                        toast.success(`[${this.monitorList[data.monitorID].name}] [Up] ${data.msg}`, {
                            timeout: 20000,
                        });
                    } else {
                        toast(`[${this.monitorList[data.monitorID].name}] ${data.msg}`);
                    }

                    if (! (data.monitorID in this.importantHeartbeatList)) {
                        this.importantHeartbeatList[data.monitorID] = [];
                    }

                    this.importantHeartbeatList[data.monitorID].unshift(data);
                }
            });

            socket.on("heartbeatList", (monitorID, data, overwrite = false) => {
                if (! (monitorID in this.heartbeatList) || overwrite) {
                    this.heartbeatList[monitorID] = data;
                } else {
                    this.heartbeatList[monitorID] = data.concat(this.heartbeatList[monitorID]);
                }
            });

            socket.on("avgPing", (monitorID, data) => {
                this.avgPingList[monitorID] = data;
            });

            socket.on("uptime", (monitorID, type, data) => {
                this.uptimeList[`${monitorID}_${type}`] = data;
            });

            socket.on("certInfo", (monitorID, data) => {
                this.tlsInfoList[monitorID] = JSON.parse(data);
            });

            socket.on("importantHeartbeatList", (monitorID, data, overwrite) => {
                if (! (monitorID in this.importantHeartbeatList) || overwrite) {
                    this.importantHeartbeatList[monitorID] = data;
                } else {
                    this.importantHeartbeatList[monitorID] = data.concat(this.importantHeartbeatList[monitorID]);
                }
            });

            socket.on("connect_error", (err) => {
                console.error(`Failed to connect to the backend. Socket.io connect_error: ${err.message}`);
                this.connectionErrorMsg = `Cannot connect to the socket server. [${err}] Reconnecting...`;
                this.socket.connected = false;
                this.socket.firstConnect = false;
            });

            socket.on("disconnect", () => {
                console.log("disconnect");
                this.connectionErrorMsg = "Lost connection to the socket server. Reconnecting...";
                this.socket.connected = false;
            });

            socket.on("connect", () => {
                console.log("Connected to the socket server");
                this.socket.connectCount++;
                this.socket.connected = true;

                // Reset Heartbeat list if it is re-connect
                if (this.socket.connectCount >= 2) {
                    this.clearData();
                }

                let token = this.storage().token;

                if (token) {
                    if (token !== "autoLogin") {
                        this.loginByToken(token);
                    } else {

                        // Timeout if it is not actually auto login
                        setTimeout(() => {
                            if (! this.loggedIn) {
                                this.allowLoginDialog = true;
                                this.$root.storage().removeItem("token");
                            }
                        }, 5000);

                    }
                } else {
                    this.allowLoginDialog = true;
                }

                this.socket.firstConnect = false;
            });

        },

        storage() {
            return (this.remember) ? localStorage : sessionStorage;
        },

        getJWTPayload() {
            const jwtToken = this.$root.storage().token;

            if (jwtToken && jwtToken !== "autoLogin") {
                return jwt_decode(jwtToken);
            }
            return undefined;
        },

        getSocket() {
            return socket;
        },

        toastRes(res) {
            if (res.ok) {
                toast.success(res.msg);
            } else {
                toast.error(res.msg);
            }
        },

        login(username, password, token, callback) {
            socket.emit("login", {
                username,
                password,
                token,
            }, (res) => {
                if (res.tokenRequired) {
                    callback(res);
                }

                if (res.ok) {
                    this.storage().token = res.token;
                    this.socket.token = res.token;
                    this.loggedIn = true;

                    // Trigger Chrome Save Password
                    history.pushState({}, "");
                }

                callback(res);
            });
        },

        loginByToken(token) {
            socket.emit("loginByToken", token, (res) => {
                this.allowLoginDialog = true;

                if (! res.ok) {
                    this.logout();
                } else {
                    this.loggedIn = true;
                }
            });
        },

        logout() {
            socket.emit("logout", () => { });
            this.storage().removeItem("token");
            this.socket.token = null;
            this.loggedIn = false;
            this.clearData();
        },

        prepare2FA(callback) {
            socket.emit("prepare2FA", callback);
        },

        save2FA(secret, callback) {
            socket.emit("save2FA", callback);
        },

        disable2FA(callback) {
            socket.emit("disable2FA", callback);
        },

        verifyToken(token, callback) {
            socket.emit("verifyToken", token, callback);
        },

        twoFAStatus(callback) {
            socket.emit("twoFAStatus", callback);
        },

        getMonitorList(callback) {
            if (! callback) {
                callback = () => { };
            }
            socket.emit("getMonitorList", callback);
        },

        add(monitor, callback) {
            socket.emit("add", monitor, callback);
        },

        deleteMonitor(monitorID, callback) {
            socket.emit("deleteMonitor", monitorID, callback);
        },

        clearData() {
            console.log("reset heartbeat list");
            this.heartbeatList = {};
            this.importantHeartbeatList = {};
        },

        uploadBackup(uploadedJSON, importHandle, callback) {
            socket.emit("uploadBackup", uploadedJSON, importHandle, callback);
        },

        clearEvents(monitorID, callback) {
            socket.emit("clearEvents", monitorID, callback);
        },

        clearHeartbeats(monitorID, callback) {
            socket.emit("clearHeartbeats", monitorID, callback);
        },

        clearStatistics(callback) {
            socket.emit("clearStatistics", callback);
        },

        getMonitorBeats(monitorID, period, callback) {
            socket.emit("getMonitorBeats", monitorID, period, callback);
        }
    },

    computed: {

        lastHeartbeatList() {
            let result = {};

            for (let monitorID in this.heartbeatList) {
                let index = this.heartbeatList[monitorID].length - 1;
                result[monitorID] = this.heartbeatList[monitorID][index];
            }

            return result;
        },

        statusList() {
            let result = {};

            let unknown = {
                text: this.$t("Unknown"),
                color: "secondary",
            };

            for (let monitorID in this.lastHeartbeatList) {
                let lastHeartBeat = this.lastHeartbeatList[monitorID];

                if (! lastHeartBeat) {
                    result[monitorID] = unknown;
                } else if (lastHeartBeat.status === 1) {
                    result[monitorID] = {
                        text: this.$t("Up"),
                        color: "primary",
                    };
                } else if (lastHeartBeat.status === 0) {
                    result[monitorID] = {
                        text: this.$t("Down"),
                        color: "danger",
                    };
                } else if (lastHeartBeat.status === 2) {
                    result[monitorID] = {
                        text: this.$t("Pending"),
                        color: "warning",
                    };
                } else {
                    result[monitorID] = unknown;
                }
            }

            return result;
        },
    },

    watch: {

        // Reload the SPA if the server version is changed.
        "info.version"(to, from) {
            if (from && from !== to) {
                window.location.reload();
            }
        },

        remember() {
            localStorage.remember = (this.remember) ? "1" : "0";
        },

        // Reconnect the socket io, if status-page to dashboard
        "$route.fullPath"(newValue, oldValue) {
            if (noSocketIOPages.includes(newValue)) {
                return;
            }
            this.initSocketIO();
        },

    },

};