import React from 'react';
import NavBar from "./NavBar";
import { Link } from "react-router-dom";
import { TimelineRounded as TimelineRoundedIcon, ExitToAppRounded as ExitToAppRoundedIcon, HistoryRounded as HistoryRoundedIcon, SettingsRounded as SettingsRoundedIcon, PersonRounded as PersonRoundedIcon, GroupRounded as GroupRoundedIcon, AddRounded as AddRoundedIcon, SwapHorizRounded as SwapHorizRoundedIcon, PeopleRounded as PeopleRoundedIcon, DeleteRounded as DeleteRoundedIcon, QuestionAnswerRounded as QuestionAnswerRoundedIcon, SearchRounded as SearchRoundedIcon } from "@material-ui/icons";
import Checkbox from '@material-ui/core/Checkbox';

import Xarrow from 'react-xarrows';

import "firebase/auth";
import "firebase/firestore";
import "firebase/functions";
import Button from './Button';
import LinkButton from './LinkButton';
import Footer from "./Footer";
import TestStart from './TestStart';
import ClassicTestStart from './ClassicTestStart';
import LivesTestStart from './LivesTestStart';
import CountdownTestStart from './CountdownTestStart';
import "./css/Form.css";
import "./css/History.css";
import "./css/LoggedInHome.css";
import "./css/PopUp.css";
import "./css/OptionsListOverlay.css";

import { withRouter } from "react-router-dom";

export default withRouter(class LoggedInHome extends React.Component {
	constructor(props) {
		super(props);
		this.state = {
			user: props.user,
			db: props.db,
			functions: {
				createProgress: props.functions.httpsCallable("createProgress"),
			},
			canStartTest: false,
			loading: false,
			selections: {},
			navbarItems: [
				{
					type: "link",
					name: "Mistakes",
					link: "/history/mistakes",
					icon: <TimelineRoundedIcon />,
					hideTextMobile: true,
				},
				{
					type: "link",
					name: "History",
					link: "/history",
					icon: <HistoryRoundedIcon />,
					hideTextMobile: true,
				},
				{
					type: "link",
					name: "Settings",
					link: "/settings",
					icon: <SettingsRoundedIcon />,
					hideTextMobile: true,
				},
				{
					type: "button",
					onClick: () => this.props.firebase.auth().signOut(),
					icon: <ExitToAppRoundedIcon />,
					hideTextMobile: true,
				}
			],
			progressHistoryIncomplete: [],
			showTestStart: false,
			showClassicTestStart: false,
			showLivesTestStart: false,
			sliderValue: 1,
			switchLanguage: false,
			ignoreCaps: false,
			ignoreAccents: false,
			showNumberOfAnswers: false,
			totalTestQuestions: 1,
			pendingDeletions: {},
		};

		let isMounted = true;
		Object.defineProperty(this, "isMounted", {
			get: () => isMounted,
			set: (value) => isMounted = value,
		});
	}

	setState = (state, callback = null) => {
		if (this.isMounted) super.setState(state, callback);
	}

	componentDidMount() {
		document.title = "Parandum";
		
		const userSetsRef = this.state.db.collection("sets")
			.where("owner", "==", this.state.user.uid)
			.orderBy("title");
		const userGroupsRef = this.state.db.collection("users")
			.doc(this.state.user.uid)
			.collection("groups");
		const userGroupSetsRef = this.state.db.collection("sets");
		const groupRef = this.state.db.collection("groups");
		const progressRef = this.state.db.collection("progress")
			.where("uid", "==", this.state.user.uid)
			.where("duration", "==", null)
			.orderBy("start_time", "desc")

		let newState = this.state;

		const userSetsQuery = userSetsRef.get().then((userSetsQuerySnapshot) => {
			newState.userSets = userSetsQuerySnapshot.docs;

			userSetsQuerySnapshot.docs.map((doc) => newState.selections[doc.id] = false);

		});
		const userGroupsQuery = userGroupsRef.get().then(async (userGroupsQuerySnapshot) => {
			newState.user.groups = [];
			var userGroupSets = [];

			return Promise.all(userGroupsQuerySnapshot.docs.map((group) => {
				const groupData = groupRef.doc(group.id).get().catch((error) => {
					console.log(`Couldn't get group data, possibly due to outdated cached data: ${error}`);
					return true;
				});

				return userGroupSetsRef
					.where("public", "==", true)
					.where("groups", "array-contains", group.id)
					.get().then(async (userGroupSetsQuerySnapshot) => {
						groupData.then((result) => {
							if (typeof result !== "undefined" && typeof result.data === "function" && userGroupSetsQuerySnapshot.docs.length > 0) {
								newState.user.groups.push(group.id);

								userGroupSets.push({
									group: result,
									sets: userGroupSetsQuerySnapshot.docs,
								});
								
								userGroupSetsQuerySnapshot.docs.map((doc) => newState.selections[doc.id] = false);
							}
						});
					});
			})).then(() => {
				newState.userGroupSets = userGroupSets.sort((a,b) => {
					if (a.group.data().display_name < b.group.data().display_name) {
						return -1;
					}
					if (a.group.data().display_name > b.group.data().display_name) {
						return 1;
					}
					return 0;
				})
			});
		});
		const progressQuery = progressRef.get().then((progressQuerySnapshot) => {
			progressQuerySnapshot.docs.map((doc) => {
				const data = doc.data();
				return newState.progressHistoryIncomplete.push({
					id: doc.id,
					setTitle: data.set_title,
					switchLanguage: data.switch_language,
					percentageProgress: (data.progress / data.questions.length * 100).toFixed(2),
					grade: (data.progress > 0 ? data.correct.length / data.progress * 100 : 0).toFixed(2),
					mode: data.mode,
					correct: data.correct.length,
					progress: data.progress,
				});
			})
		})

		Promise.all([
			userSetsQuery,
			userGroupsQuery,
			progressQuery
		]).then(() => {
			this.setState(newState);
			this.props.page.load();
		});

		this.props.logEvent("page_view");
	}

	componentWillUnmount() {
		this.isMounted = false;
		this.props.page.unload();
	}

	stopLoading = () => {
		this.setState({
			canStartTest: true,
			loading: false,
		});
	}

	startTest = (mode) => {
		if (this.state.canStartTest) {
			const selections = Object.keys(this.state.selections)
				.filter(x => this.state.selections[x]);
			this.state.functions.createProgress({
				sets: selections,
				switch_language: this.state.switchLanguage,
				mode: mode,
				limit: this.state.sliderValue,
				ignoreCaps: this.state.ignoreCaps,
				ignoreAccents: this.state.ignoreAccents,
				showNumberOfAnswers: this.state.showNumberOfAnswers,
			}).then((result) => {
				const progressId = result.data;
				this.stopLoading();
				this.props.history.push("/progress/" + progressId);

				this.props.logEvent("start_test", {
					progress_id: progressId,
				});
			}).catch((error) => {
				console.log(`Couldn't start test: ${error}`);
				this.stopLoading();
			});
	
			this.setState({
				canStartTest: false,
				loading: true,
			});
		}
	}

	handleSetSelectionChange = (event) => {
		let newState = { ...this.state };
		newState.selections[event.target.name] = event.target.checked;
		this.setState(newState);
		if (Object.values(this.state.selections).indexOf(true) > -1) {
			this.setState({ canStartTest: true });
		} else {
			this.setState({ canStartTest: false });
		}
	}

	deleteProgress = (progressId) => {
		if (this.state.pendingDeletions[progressId] !== true) {
			let pendingDeletions = this.state.pendingDeletions;
			pendingDeletions[progressId] = true;
			
			this.setState({
				pendingDeletions: pendingDeletions,
			});
			
			this.state.db.collection("progress")
			.doc(progressId)
			.delete()
			.then(() => {
				const progressIndex = this.state.progressHistoryIncomplete.map((obj) => obj.id).indexOf(progressId);
				let newState = {
						progressHistoryIncomplete: this.state.progressHistoryIncomplete,
					};
					newState.progressHistoryIncomplete.splice(progressIndex, 1);
					newState.pendingDeletions = this.state.pendingDeletions;
					delete pendingDeletions[progressId];
					this.setState(newState);
				})
				.catch((error) => {
					console.log(`Couldn't delete progress: ${error}`);
					let pendingDeletions = this.state.pendingDeletions;
					delete pendingDeletions[progressId];
					this.setState({
						pendingDeletions: pendingDeletions,
					});
				});
		}
	}

	showTestStart = () => {
		if (this.state.canStartTest) {
			this.setState({
				showTestStart: true,
				totalTestQuestions: 1,
			});
		}
	}

	hideTestStart = () => {
		this.setState({
			showTestStart: false,
		});
	}

	showIndividualTestPrompt = async (mode) => {
		if (!this.state.loading) {
			if (mode === "classic") {
				this.setState({
					loading: true,
				})
				const setIds = Object.keys(this.state.selections)
					.filter(x => this.state.selections[x]);

					const totalTestQuestions = (await Promise.all(setIds.map((setId) =>
					this.state.db.collection("sets")
					.doc(setId)
					.collection("vocab")
					.get()
					.then(querySnapshot => querySnapshot.docs.length)
				))).reduce((a, b) => a + b);
				
				this.setState({
					showTestStart: false,
					showClassicTestStart: true,
					sliderValue: totalTestQuestions,
					switchLanguage: false,
					totalTestQuestions: totalTestQuestions,
					loading: false,
				});
			} else if (mode === "lives") {
				this.setState({
					showTestStart: false,
					showLivesTestStart: true,
					switchLanguage: false,
					sliderValue: 5,
				});
			} else {
				// countdown
				// this.setState({
					// 	showTestStart: false,
					// 	showCountdownTestStart: true,
					//	switchLanguage: false,
					// });
			}
		}
	}

	hideClassicTestStart = () => {
		this.setState({
			showClassicTestStart: false,
		});
	}

	hideLivesTestStart = () => {
		this.setState({
			showLivesTestStart: false,
		});
	}

	hideCountdownTestStart = () => {
		this.setState({
			showCountdownTestStart: false,
		});
	}

	changeSliderValue = (value) => {
		if (value >= 1 && value <= 999) this.setState({
			sliderValue: value,
		});
	}

	handleSwitchLanguageChange = (event) => {
		this.setState({
			switchLanguage: event.target.checked,
		});
	}

	handleIgnoreCapsChange = (event) => {
		this.setState({
			ignoreCaps: event.target.checked,
		});
	}

	handleIgnoreAccentsChange = (event) => {
		this.setState({
			ignoreAccents: event.target.checked,
		});
	}

	handleShowNumberOfAnswersChange = (event) => {
		this.setState({
			showNumberOfAnswers: event.target.checked,
		});
	}

	render() {
		return (
			<div>
				<NavBar items={this.state.navbarItems} />
				
				<main>
					<div className="page-header page-header--home">
						<h1>Study</h1>
						<div className="button-container buttons--desktop">
							<Button
								onClick={this.showTestStart}
								disabled={!this.state.canStartTest}
							>
								Test ({Object.values(this.state.selections).filter(x => x === true).length})
							</Button>
							{
								(!this.props.page.loaded() || (this.state.userSets && this.state.userSets.length > 0)) &&
								<LinkButton
									to="/my-sets"
									>
									My Sets
								</LinkButton>
							}
							<LinkButton to="/create-set" icon={<AddRoundedIcon/>} className="button--round" title="Create set"></LinkButton>
							<LinkButton to="/search" icon={<SearchRoundedIcon/>} className="button--round" title="Search sets"></LinkButton>
							<LinkButton to="/groups" icon={<GroupRoundedIcon/>} className="button--round" title="Groups"></LinkButton>
						</div>
						<div className="button-container buttons--mobile">
							<LinkButton id="create-set-button-mobile" to="/create-set" icon={<AddRoundedIcon />} className="button--round buttons--mobile" title="Create set"></LinkButton>
							<LinkButton to="/search" icon={<SearchRoundedIcon/>} className="button--round" title="Search sets"></LinkButton>
							<LinkButton to="/groups" icon={<GroupRoundedIcon/>} className="button--round" title="Groups"></LinkButton>
						</div>
					</div>
					<div className="page-header page-header--left buttons--mobile">
						<Button
							onClick={this.showTestStart}
							disabled={!this.state.canStartTest}
						>
							Test ({Object.values(this.state.selections).filter(x => x === true).length})
						</Button>
						{
							this.state.userSets && this.state.userSets.length > 0 &&
							<LinkButton
								to="/my-sets"
							>
								My Sets
							</LinkButton>
						}
					</div>
					{
						this.state.progressHistoryIncomplete.length > 0 &&
						<>
							<h2>Incomplete Tests</h2>
							<div className="progress-history-container progress-history-container--incomplete">
								<div>
									<h3>Set</h3>
									<h3>Progress</h3>
									<h3>Mark</h3>
									<h3>Grade</h3>
									<h3>Mode</h3>
									<span></span>
								</div>
								{
									this.state.progressHistoryIncomplete.map((progressItem) =>
										<div key={progressItem.id}>
											<Link
												to={`/progress/${progressItem.id}`}
											>
												{progressItem.setTitle}
												{
													progressItem.switchLanguage &&
													<SwapHorizRoundedIcon />
												}
											</Link>
											<p>{progressItem.percentageProgress}%</p>
											<p>{progressItem.correct}/{progressItem.progress}</p>
											<p>{progressItem.grade}%</p>
											<p>
												{
													progressItem.mode === "questions"
														?
														<QuestionAnswerRoundedIcon />
														:
														<PeopleRoundedIcon />
												}
											</p>
											<p>
												<Button
													className="button--no-background"
													onClick={() => this.deleteProgress(progressItem.id)}
													icon={<DeleteRoundedIcon />}
													disabled={this.state.pendingDeletions[progressItem.id] === true}
													loading={this.state.pendingDeletions[progressItem.id] === true}
													title="Delete"
												></Button>
											</p>
										</div>
									)
								}
							</div>
						</>
					}
					<p id="page-intro" className="page-intro">
						{
							this.state.userSets && this.state.userSets.length > 0
							?
							"Choose sets to study"
							:
							"Create a set to start studying!"
						}
					</p>
					{
						(this.state.userSets && this.state.userSets.length === 0) && (this.state.userGroupSets && this.state.userGroupSets.length === 0) && this.state.progressHistoryIncomplete.length === 0 &&
						<>
							<Xarrow
								start="page-intro"
								end="create-set-button-mobile"
								curveness={0.5}
								color="white"
								divContainerProps={{ className: "buttons--mobile" }}
							/>
						</>
					}
					<div className="form set-list">
						{this.state.userSets && this.state.userSets.length > 0 &&
							<div className="checkbox-list-container">
								<Link
									to="/my-sets"
								>
									<h3><PersonRoundedIcon /> My Sets</h3>
								</Link>
								<div className="checkbox-list">
									{this.state.userSets
										.sort((a, b) => {
											if (a.data().title < b.data().title) {
												return -1;
											}
											if (a.data().title > b.data().title) {
												return 1;
											}
											return 0;
										})
										.map(set =>
											<div key={set.id}>
												<label>
													<Checkbox
														name={set.id}
														checked={this.state.selections[set.id]}
														onChange={this.handleSetSelectionChange}
														inputProps={{ 'aria-label': 'checkbox' }}
													/>
													<Link to={`/sets/${set.id}`}>
														{set.data().title}
													</Link>
												</label>
											</div>
									)}
								</div>
							</div>
						}
						{this.state.userGroupSets && this.state.userGroupSets.length > 0 && this.state.userGroupSets.group && typeof this.state.userGroupSets.group.data === "function" && this.state.userGroupSets
							.map(data =>
							data.sets && data.sets.length > 0 &&
								<div key={data.group.id} className="checkbox-list-container">
									<Link to={`/groups/${data.group.id}`}>
										<h3><GroupRoundedIcon /> {data.group.data().display_name}</h3>
									</Link>

									<div className="checkbox-list">
										{data.sets
											.sort((a, b) => {
												if (a.data().title < b.data().title) {
													return -1;
												}
												if (a.data().title > b.data().title) {
													return 1;
												}
												return 0;
											})
											.map(set =>
												<div key={set.id}>
													<label>
														<Checkbox
															name={set.id}
															checked={this.state.selections[set.id]}
															onChange={this.handleSetSelectionChange}
															inputProps={{ 'aria-label': 'checkbox' }}
														/>
														<Link to={`/sets/${set.id}`}>
															{set.data().title}
														</Link>
													</label>
												</div>
											)
										}
									</div>
								</div>
						)}
					</div>
				</main>
				<Footer />

				{
					this.state.showTestStart &&
					<TestStart
						hideTestStart={this.hideTestStart}
						showIndividualTestPrompt={this.showIndividualTestPrompt}
						loading={this.state.loading}
					/>
				}
				{
					this.state.showClassicTestStart &&
					<ClassicTestStart
						hide={this.hideClassicTestStart}
						startTest={this.startTest}
						max={this.state.totalTestQuestions}
						sliderValue={this.state.sliderValue}
						onSliderChange={this.changeSliderValue}
						switchLanguage={this.state.switchLanguage}
						ignoreCaps={this.state.ignoreCaps}
						ignoreAccents={this.state.ignoreAccents}
						showNumberOfAnswers={this.state.showNumberOfAnswers}
						handleSwitchLanguageChange={this.handleSwitchLanguageChange}
						handleIgnoreCapsChange={this.handleIgnoreCapsChange}
						handleIgnoreAccentsChange={this.handleIgnoreAccentsChange}
						handleShowNumberOfAnswersChange={this.handleShowNumberOfAnswersChange}
						loading={this.state.loading}
					/>
				}
				{
					this.state.showLivesTestStart &&
					<LivesTestStart
						hide={this.hideLivesTestStart}
						startTest={this.startTest}
						max={20}
						sliderValue={this.state.sliderValue}
						onSliderChange={this.changeSliderValue}
						switchLanguage={this.state.switchLanguage}
						ignoreCaps={this.state.ignoreCaps}
						ignoreAccents={this.state.ignoreAccents}
						showNumberOfAnswers={this.state.showNumberOfAnswers}
						handleSwitchLanguageChange={this.handleSwitchLanguageChange}
						handleIgnoreCapsChange={this.handleIgnoreCapsChange}
						handleIgnoreAccentsChange={this.handleIgnoreAccentsChange}
						handleShowNumberOfAnswersChange={this.handleShowNumberOfAnswersChange}
						loading={this.state.loading}
					/>
				}
				{
					this.state.showCountdownTestStart &&
					<CountdownTestStart
						hide={this.hideCountdownTestStart}
						startTest={this.startTest}
					/>
				}
			</div>
		)
	}
})