import * as React from "react";

import { BrowserRouter, Route, Redirect } from "react-router-dom";

import AuthRoute from "../security/AuthRoute";

import Dashboard from "../pages/dashboard";
import LoginPage from "../pages/login";
import LevelListPage from "../pages/levelList";
import LevelPage from "../pages/level";
import ReviewPage from "../pages/review";
import SummaryPage from "../pages/summary";
import WelcomePage from "../pages/intro";

import Drawer from "../containers/Drawer";

import { BACKEND_URL } from "../config";

import { ILevel } from "../models/level";
import { ILearner } from "../models/learner";
import { IVocab, VocabType } from "../models/vocab";
import { IReviewMetadata, ReviewType } from "../models/review";
import { IUser } from "../models/user";

// TODO: Replace the sessionStorage with localStorage?
// TODO: Cache API-Calls
// TODO: When mounting without a login, check if the sessionToken is still valid
export default class Application extends React.Component<{}> {
    constructor(props: any) {
        super(props);

        // Load a key from the SessionStorage
        const authKey = window.sessionStorage.getItem("sessionToken") || null;
        // TODO
        const loggedIn = authKey !== null;

        this.login = this.login.bind(this);
        this.isAuthenticated = this.isAuthenticated.bind(this);
    }

    getLevels(): ILevel[] {
        console.log("STUB: Application::getLevels");
        // TODO: Actually fetch them from somewhere
        const levels = [{
            name: "Der Bauer auf dem Feld",
            desc: "So fängt alles an: Du bist ein einfacher Bauer und musst dich die Karriereleiter mit deinen freshen Latein-Skills hinaufarbeiten",
            level: 1,
            done: true,
        }, {
            name: "???",
            desc: "Warum schreibe ich überhaupt was?dsd dddddddddddddddddddddd",
            level: 2,
            done: false,
        }];

        return levels;
    }

    getLastReview = (): IReviewMetadata => {
        console.log("STUB: Application::getLastReview");

        // TODO: Actually fetch this
        // TODO: Stub
        return {} as IReviewMetadata;
    }

    setLastReview = (meta: IReviewMetadata) => {
        console.log("STUB: Application::setLastReview");

        // TODO: Send this to the server
        this.setState({
            lastReview: meta,
        });
    }

    getReviewQueue = (): IVocab[] => {
        console.log("STUB: Application::getReviewQueue");

        // TODO: Implement
        return [{
            german: ["Wein"],
            hint: "Worte auf '-um' sind meistens NeutrUM",
            type: VocabType.NOMEN,
            latin: {
                grundform: "Vinum",
                genitiv: "Vini",
                genus: "Neutrum"
            },
            id: 0
        }/* , {
          *    latin: "Vici",
          *    german: "<Wortbedeutung>",
          *    hint: "Wird \"Viki\" und nicht \"Vichi\" ausgesprochen",
          *    mnemonic: "Merk dir das Wort mit Caesars berühmten Worten: \"Veni Vidi Vici\"; Er kam, sah und siegte",
          *    type: VocabType.NOMEN,
          *    id: 2
            }, {
          *    latin: "fuga",
          *    german: "Flucht",
          *    hint: "Worte auf \"-a\" sind FeminA",
          *    type: VocabType.NOMEN,
          *    id: 3
            } */] as IVocab[];
    }

    getLearners(): ILearner[] {
        console.log("STUB: Application::getLearners");

        // TODO: Implement
        return [{
            username: "Polynomdivision",
            level: 5,
            score: 400,
        }, {
            username: "Polynomdivision2",
            level: 3,
            score: 500,
        }, {
            username: "Der eine Typ",
            level: 7,
            score: 100,
        }];
    }

    getTopTenLearners(): ILearner[] {
        console.log("STUB: Application::getTopTenLearners");

        // TODO: Implement
        return [{
            username: "Polynomdivision",
            level: 5,
            score: 400,
        }, {
            username: "Polynomdivision2",
            level: 3,
            score: 500,
        }, {
            username: "Der eine Typ",
            level: 7,
            score: 100,
        }];
    }

    getNextLevel(): ILevel {
        console.log("STUB: Application::getNextLevel");

        // TODO: Actually fetch data
        return {
            name: "???",
            desc: "Warum schreibe ich überhaupt was?dsd dddddddddddddddddddddd",
            level: 2,
            done: false,
        };
    }

    getLevelVocab(id: number): IVocab[] {
        console.log("STUB: Application::getLevelVocab");

        // TODO: Actually implement this
        // TODO: Don't fetch this when it was already fetched once.
        return [{
            german: ["Wein"],
            hint: "Worte auf '-um' sind meistens NeutrUM",
            type: VocabType.NOMEN,
            latin: {
                grundform: "Vinum",
                genitiv: "Vini",
                genus: "Neutrum"
            },
            id: 0
        }/* , {
          *    latin: "Vici",
          *    german: "<Wortbedeutung>",
          *    hint: "Wird \"Viki\" und nicht \"Vichi\" ausgesprochen",
          *    mnemonic: "Merk dir das Wort mit Caesars berühmten Worten: \"Veni Vidi Vici\"; Er kam, sah und siegte",
          *    type: VocabType.NOMEN,
          *    id: 2
            }, {
          *    latin: "fuga",
          *    german: "Flucht",
          *    hint: "Worte auf \"-a\" sind FeminA",
          *    type: VocabType.NOMEN,
          *    id: 3
            } */] as IVocab[];
    }

    login(username: string, password: string): Promise<IUser | {}> {
        return new Promise((res, rej) => {
            // TODO: First login? Redirect to /welcome
            fetch(`${BACKEND_URL}/login`, {
                method: "POST",
                headers: new Headers({
                    'Content-Type': "application/json",
                }),
                body: JSON.stringify({
                    // NOTE: We will force HTTPS and hash using pbkdf2 on the
                    // server
                    username: username,
                    hash: password,
                }),
            }).then(data => data.json())
                .then((resp) => {
                    if (resp.error === "0") {
                        this.setState({
                            loggedIn: true,
                            user: resp.data,
                        });
                        res(resp.data);
                    } else {
                        rej({});
                    }
                });
        });
    }

    // Checks whether the user is logged in
    isAuthenticated() {
        // TODO: Security?
        // TODO: Implement
        return true;
    }

    closeDrawer = () => {
        this.setState({
            drawerOpen: false,
        });
    }

    drawerButtonState = (show: boolean) => {
        // This is required as we would otherwise try to continously update
        // the state, resulting in an infinte loop
        if (show !== this.state.showDrawerButton) {
            this.setState({
                showDrawerButton: show,
            });
        }
    }

    render() {
        return <BrowserRouter
            basename="/app/">
            <div className="flex">
                <Drawer />
                <div className="content">
                    <Route exact path="/" component={() => <Redirect to="/login" />} />
                    <Route exact path="/login" component={() => {
                        return <LoginPage loggedIn={this.state.loggedIn} login={this.login} />
                    }} />
                    <AuthRoute
                        isAuth={this.isAuthenticated}
                        path="/dashboard"
                        component={() => {
                            return <Dashboard
                                nextLevel={this.getNextLevel}
                                getLastReview={this.getLastReview}
                                getTopTen={this.getTopTenLearners} />
                        }} />
                    <AuthRoute
                        isAuth={this.isAuthenticated}
                        path="/welcome"
                        component={() => {
                            return <WelcomePage />
                        }} />
                    <AuthRoute
                        isAuth={this.isAuthenticated}
                        path="/levelList"
                        component={() => <LevelListPage
                            levels={this.getLevels()} />} />
                    {/*We cannot use AuthRoute here, because match is undefined otherwise*/}
                    <Route
                        path="/level/:id"
                        component={({ match }) => {
                            if (this.isAuthenticated()) {
                                return <LevelPage
                                    id={match.params.id}
                                    levelVocab={this.getLevelVocab}
                                    drawerButtonState={this.drawerButtonState}
                                    setLastReview={this.setLastReview} />;
                            } else {
                                return <Redirect to="/login" />;
                            }
                        }} />
                    <Route
                        path="/review/level/:id"
                        component={({ match }) => {
                            if (this.isAuthenticated()) {
                                return <ReviewPage
                                    reviewType={ReviewType.LEVEL}
                                    levelId={match.params.id}
                                    vocabByLevel={this.getLevelVocab}
                                    drawerButtonState={this.drawerButtonState}
                                    setLastReview={this.setLastReview} />;
                            } else {
                                return <Redirect to="/login" />;
                            }
                        }} />
                    <AuthRoute
                        isAuth={this.isAuthenticated}
                        path="/review/queue"
                        component={() => {
                            return <ReviewPage
                                reviewType={ReviewType.QUEUE}
                                vocabByQueue={this.getReviewQueue}
                                drawerButtonState={this.drawerButtonState}
                                setLastReview={this.setLastReview} />;
                        }} />
                    <AuthRoute
                        isAuth={this.isAuthenticated}
                        path="/review/summary"
                        component={() => {
                            return <SummaryPage
                                reviewMeta={this.getLastReview} />
                        }} />
                </div>
            </div>
        </BrowserRouter>;
    }
};