import osmAuth from "osm-auth";
import {Store, Stores, UIEventSource} from "../UIEventSource";
import {OsmPreferences} from "./OsmPreferences";
import {ChangesetHandler} from "./ChangesetHandler";
import {ElementStorage} from "../ElementStorage";
import Svg from "../../Svg";
import Img from "../../UI/Base/Img";
import {Utils} from "../../Utils";
import {OsmObject} from "./OsmObject";
import {Changes} from "./Changes";

export default class UserDetails {

    public loggedIn = false;
    public name = "Not logged in";
    public uid: number;
    public csCount = 0;
    public img: string;
    public unreadMessages = 0;
    public totalMessages = 0;
    home: { lon: number; lat: number };
    public backend: string;

    constructor(backend: string) {
        this.backend = backend;
    }
}

export class OsmConnection {

    public static readonly oauth_configs = {
        "osm": {
            oauth_consumer_key: 'hivV7ec2o49Two8g9h8Is1VIiVOgxQ1iYexCbvem',
            oauth_secret: 'wDBRTCem0vxD7txrg1y6p5r8nvmz8tAhET7zDASI',
            url: "https://www.openstreetmap.org"
        },
        "osm-test": {
            oauth_consumer_key: 'Zgr7EoKb93uwPv2EOFkIlf3n9NLwj5wbyfjZMhz2',
            oauth_secret: '3am1i1sykHDMZ66SGq4wI2Z7cJMKgzneCHp3nctn',
            url: "https://master.apis.dev.openstreetmap.org"
        }


    }
    public auth;
    public userDetails: UIEventSource<UserDetails>;
    public isLoggedIn: Store<boolean>
    public loadingStatus = new UIEventSource<"not-attempted" | "loading" | "error" | "logged-in">("not-attempted")
    public preferencesHandler: OsmPreferences;
    public readonly _oauth_config: {
        oauth_consumer_key: string,
        oauth_secret: string,
        url: string
    };
    private readonly _dryRun: UIEventSource<boolean>;
    private fakeUser: boolean;
    private _onLoggedIn: ((userDetails: UserDetails) => void)[] = [];
    private readonly _iframeMode: Boolean | boolean;
    private readonly _singlePage: boolean;
    private isChecking = false;

    constructor(options: {
                    dryRun?: UIEventSource<boolean>,
                    fakeUser?: false | boolean,
                    oauth_token?: UIEventSource<string>,
                    // Used to keep multiple changesets open and to write to the correct changeset
                    singlePage?: boolean,
                    osmConfiguration?: "osm" | "osm-test",
                    attemptLogin?: true | boolean
                }
    ) {
        this.fakeUser = options.fakeUser ?? false;
        this._singlePage = options.singlePage ?? true;
        this._oauth_config = OsmConnection.oauth_configs[options.osmConfiguration ?? 'osm'] ?? OsmConnection.oauth_configs.osm;
        console.debug("Using backend", this._oauth_config.url)
        OsmObject.SetBackendUrl(this._oauth_config.url + "/")
        this._iframeMode = Utils.runningFromConsole ? false : window !== window.top;

        this.userDetails = new UIEventSource<UserDetails>(new UserDetails(this._oauth_config.url), "userDetails");
        if (options.fakeUser) {
            const ud = this.userDetails.data;
            ud.csCount = 5678
            ud.loggedIn = true;
            ud.unreadMessages = 0
            ud.name = "Fake user"
            ud.totalMessages = 42;
        }
        const self = this;
        this.isLoggedIn = this.userDetails.map(user => user.loggedIn);
        this.isLoggedIn.addCallback(isLoggedIn => {
            if (self.userDetails.data.loggedIn == false && isLoggedIn == true) {
                // We have an inconsistency: the userdetails say we _didn't_ log in, but this actor says we do
                // This means someone attempted to toggle this; so we attempt to login!
                self.AttemptLogin()
            }
        });
        
        this._dryRun = options.dryRun ?? new UIEventSource<boolean>(false);

        this.updateAuthObject();

        this.preferencesHandler = new OsmPreferences(this.auth, this);

        if (options.oauth_token?.data !== undefined) {
            console.log(options.oauth_token.data)
            const self = this;
            this.auth.bootstrapToken(options.oauth_token.data,
                (x) => {
                    console.log("Called back: ", x)
                    self.AttemptLogin();
                }, this.auth);

            options.oauth_token.setData(undefined);

        }
        if (this.auth.authenticated() && (options.attemptLogin !== false)) {
            this.AttemptLogin(); // Also updates the user badge
        } else {
            console.log("Not authenticated");
        }
    }
    
    public CreateChangesetHandler(allElements: ElementStorage, changes: Changes){
        return new ChangesetHandler(this._dryRun, this, allElements, changes, this.auth);
    }

    public GetPreference(key: string, defaultValue: string = undefined, prefix: string = "mapcomplete-"): UIEventSource<string> {
        return this.preferencesHandler.GetPreference(key, defaultValue, prefix);
    }

    public GetLongPreference(key: string, prefix: string = "mapcomplete-"): UIEventSource<string> {
        return this.preferencesHandler.GetLongPreference(key, prefix);
    }

    public OnLoggedIn(action: (userDetails: UserDetails) => void) {
        this._onLoggedIn.push(action);
    }

    public LogOut() {
        this.auth.logout();
        this.userDetails.data.loggedIn = false;
        this.userDetails.data.csCount = 0;
        this.userDetails.data.name = "";
        this.userDetails.ping();
        console.log("Logged out")
        this.loadingStatus.setData("not-attempted")
    }
    
    public Backend(): string {
        return this._oauth_config.url;
    }

    public AttemptLogin() {
        this.loadingStatus.setData("loading")
        if (this.fakeUser) {
            this.loadingStatus.setData("logged-in")
            console.log("AttemptLogin called, but ignored as fakeUser is set")
            return;
        }
        const self = this;
        console.log("Trying to log in...");
        this.updateAuthObject();
        this.auth.xhr({
            method: 'GET',
            path: '/api/0.6/user/details'
        }, function (err, details) {
            if (err != null) {
                console.log(err);
                self.loadingStatus.setData("error")
                if (err.status == 401) {
                    console.log("Clearing tokens...")
                    // Not authorized - our token probably got revoked
                    // Reset all the tokens
                    const tokens = [
                        "https://www.openstreetmap.orgoauth_request_token_secret",
                        "https://www.openstreetmap.orgoauth_token",
                        "https://www.openstreetmap.orgoauth_token_secret"]
                    tokens.forEach(token => localStorage.removeItem(token))
                }
                return;
            }

            if (details == null) {
                self.loadingStatus.setData("error")
                return;
            }

            self.CheckForMessagesContinuously();

            // details is an XML DOM of user details
            let userInfo = details.getElementsByTagName("user")[0];

            // let moreDetails = new DOMParser().parseFromString(userInfo.innerHTML, "text/xml");

            let data = self.userDetails.data;
            data.loggedIn = true;
            console.log("Login completed, userinfo is ", userInfo);
            data.name = userInfo.getAttribute('display_name');
            data.uid = Number(userInfo.getAttribute("id"))
            data.csCount = userInfo.getElementsByTagName("changesets")[0].getAttribute("count");

            data.img = undefined;
            const imgEl = userInfo.getElementsByTagName("img");
            if (imgEl !== undefined && imgEl[0] !== undefined) {
                data.img = imgEl[0].getAttribute("href");
            }
            data.img = data.img ?? Img.AsData(Svg.osm_logo);

            const homeEl = userInfo.getElementsByTagName("home");
            if (homeEl !== undefined && homeEl[0] !== undefined) {
                const lat = parseFloat(homeEl[0].getAttribute("lat"));
                const lon = parseFloat(homeEl[0].getAttribute("lon"));
                data.home = {lat: lat, lon: lon};
            }

            self.loadingStatus.setData("logged-in")
            const messages = userInfo.getElementsByTagName("messages")[0].getElementsByTagName("received")[0];
            data.unreadMessages = parseInt(messages.getAttribute("unread"));
            data.totalMessages = parseInt(messages.getAttribute("count"));

            self.userDetails.ping();
            for (const action of self._onLoggedIn) {
                action(self.userDetails.data);
            }
            self._onLoggedIn = [];

        });
    }

    public closeNote(id: number | string, text?: string): Promise<void> {
        let textSuffix = ""
        if ((text ?? "") !== "") {
            textSuffix = "?text=" + encodeURIComponent(text)
        }
        if (this._dryRun.data) {
            console.warn("Dryrun enabled - not actually closing note ", id, " with text ", text)
            return new Promise((ok) => {
                ok()
            });
        }
        return new Promise((ok, error) => {
            this.auth.xhr({
                method: 'POST',
                path: `/api/0.6/notes/${id}/close${textSuffix}`,
            }, function (err, _) {
                if (err !== null) {
                    error(err)
                } else {
                    ok()
                }
            })

        })

    }

    public reopenNote(id: number | string, text?: string): Promise<void> {
        if (this._dryRun.data) {
            console.warn("Dryrun enabled - not actually reopening note ", id, " with text ", text)
            return new Promise((ok) => {
                ok()
            });
        }
        let textSuffix = ""
        if ((text ?? "") !== "") {
            textSuffix = "?text=" + encodeURIComponent(text)
        }
        return new Promise((ok, error) => {
            this.auth.xhr({
                method: 'POST',
                path: `/api/0.6/notes/${id}/reopen${textSuffix}`
            }, function (err, _) {
                if (err !== null) {
                    error(err)
                } else {
                    ok()
                }
            })

        })

    }

    public openNote(lat: number, lon: number, text: string): Promise<{ id: number }> {
        if (this._dryRun.data) {
            console.warn("Dryrun enabled - not actually opening note with text ", text)
            return new Promise<{ id: number }>((ok) => {
                window.setTimeout(() => ok({id: Math.floor(Math.random() * 1000)}), Math.random() * 5000)
            });
        }
        const auth = this.auth;
        const content = {lat, lon, text}
        return new Promise((ok, error) => {
            auth.xhr({
                method: 'POST',
                path: `/api/0.6/notes.json`,
                options: {
                    header:
                        {'Content-Type': 'application/json'}
                },
                content: JSON.stringify(content)

            }, function (
                err,
                response: string) {
                console.log("RESPONSE IS", response)
                if (err !== null) {
                    error(err)
                } else {
                    const parsed = JSON.parse(response)
                    const id = parsed.properties.id
                    console.log("OPENED NOTE", id)
                    ok({id})
                }
            })

        })

    }
    
    public addCommentToNote(id: number | string, text: string): Promise<void> {
        if (this._dryRun.data) {
            console.warn("Dryrun enabled - not actually adding comment ", text, "to  note ", id)
            return new Promise((ok) => {
                ok()
            });
        }
        if ((text ?? "") === "") {
            throw "Invalid text!"
        }

        return new Promise((ok, error) => {
            this.auth.xhr({
                method: 'POST',

                path: `/api/0.6/notes/${id}/comment?text=${encodeURIComponent(text)}`
            }, function (err, _) {
                if (err !== null) {
                    error(err)
                } else {
                    ok()
                }
            })

        })

    }

    private updateAuthObject() {
        let pwaStandAloneMode = false;
        try {
            if (Utils.runningFromConsole) {
                pwaStandAloneMode = true
            } else if (window.matchMedia('(display-mode: standalone)').matches || window.matchMedia('(display-mode: fullscreen)').matches) {
                pwaStandAloneMode = true;
            }
        } catch (e) {
            console.warn("Detecting standalone mode failed", e, ". Assuming in browser and not worrying furhter")
        }
        const standalone = this._iframeMode || pwaStandAloneMode || !this._singlePage;

        // In standalone mode, we DON'T use single page login, as 'redirecting' opens a new window anyway...
        // Same for an iframe...


        this.auth = new osmAuth({
            oauth_consumer_key: this._oauth_config.oauth_consumer_key,
            oauth_secret: this._oauth_config.oauth_secret,
            url: this._oauth_config.url,
            landing: standalone ? undefined : window.location.href,
            singlepage: !standalone,
            auto: true,

        });
    }

    private CheckForMessagesContinuously() {
        const self = this;
        if (this.isChecking) {
            return;
        }
        this.isChecking = true;
        Stores.Chronic(5 * 60 * 1000).addCallback(_ => {
            if (self.isLoggedIn.data) {
                console.log("Checking for messages")
                self.AttemptLogin();
            }
        });

    }
}