import React, { useState, useEffect } from 'react';
import * as leaflet from 'leaflet';
import { MapContainer, Polyline, TileLayer, useMap } from 'react-leaflet';
import Datetime from 'react-datetime';
import 'react-datetime/css/react-datetime.css';
import axios from 'axios';
import moment from 'moment-timezone';
import './App.css';
import 'leaflet/dist/leaflet.css';

let tzcache = {};

const durations = [
	{id: 0, len: 'Day', win: '10m', full: '10 min', delta: [1, 'days'], format: 'HH'},
	{id: 1, len: 'Day', win: '1h', full: '1 hour', delta: [1, 'days'], format: 'HH'},
	{id: 2, len: 'Week', win: '1h', full: '1 hour', delta: [7, 'days'], format: 'HH'},
	{id: 3, len: 'Week', win: '1d', full: '1 day', delta: [7, 'days'], format: 'D'},
	{id: 4, len: 'Month', win: '1d', full: '1 day', delta: [1, 'months'], format: 'D'},
	{id: 5, len: 'Month', win: '7d', full: '7 day', delta: [1, 'months'], format: 'D'},
	{id: 6, len: 'Year', win: '1d', full: '1 day', delta: [1, 'years'], format: 'M/D'},
	{id: 7, len: 'Year', win: '30d', full: '30 day', delta: [1, 'years'], format: 'M'},
];

const units = {
	'PM10': ' ug/m³',
	'PM2.5': ' ug/m³',
	'VOC': ' / 500',
	'CO2': ' ppm',
	'Energy': ' kWh',
	'Power': ' W',
	'Temperature': ' °C',
	'Humidity': '%',
	'Setpoint': ' °C',
	'State': '',
	'Lux': ' lx',
};

function useSensor(measurement, name, end, duration) {
	const [data, setData] = useState(false);
	const [loading, setLoading] = useState(false);

	useEffect(() => {
		const get = async() => {
			setLoading(true);
			try {
				const api_key = localStorage.getItem('api_key', 'null');
				const params = { end: end.unix(), duration: duration.len.toLowerCase(), window: duration.win, api_key: api_key };
				const res = await axios.get(
					'https://sensors-api.dns.t0.vc/history/'+measurement+'/'+name,
					{ params: params },
				);
				setData((d) => (res.data));
				setLoading(false);
			} catch (error) {
				console.log(error);
			}
		};

		get();
	}, [end, duration]);

	return [data, loading];
};



function Owntracks({end, duration}) {
	const [data, loading] = useSensor('owntracks', 'OwnTracks', end, duration);

	const coords = data.length ? data.map(({ lat, lon }) => [lat, lon]).filter(([lat, lon]) => lat !== null || lon !== null) : [];

	return (
		<>
		{loading ?
			<p>Loading...</p>
		:
			coords.length ?
				<MapContainer center={coords[coords.length-1]} zoom={13} scrollWheelZoom={true} style={{ width: '100%', height: 'calc(100vh - 2.5rem)' }}>
					<TileLayer
						attribution='&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
						url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
					/>
					<Polyline pathOptions={{color: 'blue'}} positions={coords} />
				</MapContainer>
			:
				<p>No coords</p>
		}
		</>
	);
}


function Graphs({end, duration}) {
	return (
		<div className='container'>
			<Owntracks end={end} duration={duration} />
		</div>
	);
}

function Menu({duration, setDuration, end, setEnd}) {
	const [submenu, setSubmenu] = useState(false);

	const chooseDuration = (x) => {
		setSubmenu(false);
		setDuration(x);
	};

	const chooseEnd = (x) => {
		setSubmenu(false);
		const newEnd = x.add(...duration.delta);
		setEnd(newEnd);
	};

	const chooseNow = (x) => {
		setSubmenu(false);
		setEnd(moment());
	};

	const next = () => {
		setSubmenu(false);
		setEnd(prevEnd => moment(prevEnd).add(...duration.delta));
	}

	const prev = () => {
		setSubmenu(false);
		setEnd(prevEnd => moment(prevEnd).subtract(...duration.delta));
	}

	return (
		<div className='menu'>
			{!!submenu &&<div className='submenu'>
				{submenu === 'end' &&
					<>
						<div className='submenu-header'>
							<h2>Choose start date:</h2>
							<button onClick={() => setSubmenu(false)}>×</button>
						</div>

						<div className='datepicker'>
							<Datetime
								input={false}
								timeFormat={false}
								onChange={(x) => chooseEnd(x)}
							/>
						</div>

						<button onClick={chooseNow}>Jump to Now</button>
					</>
				}

				{submenu === 'duration' &&
					<>
						<div className='submenu-header'>
							<h2>Choose duration:</h2>
							<button onClick={() => setSubmenu(false)}>×</button>
						</div>

						{durations.map(x =>
							<button key={x.id} onClick={() => chooseDuration(x)}>Last {x.len} / {x.full} data</button>
						)}
					</>
				}
			</div>}

			<div className='menu-container'>
				<button onClick={() => prev()}>&lt;</button>

				<button
					onClick={() => setSubmenu('end')}
					className={submenu === 'end' ? 'active' : ''}
				>
					{moment(end).subtract(duration.delta[0], duration.delta[1]).format('ddd MMM DD')}
				</button>

				<button
					onClick={() => setSubmenu('duration')}
					className={submenu === 'duration' ? 'active' : ''}
				>
					{duration.len} / {duration.win}
				</button>

				<button onClick={() => next()}>&gt;</button>
			</div>
		</div>
	);
}

function App() {
	const [duration, setDuration] = useState(durations[0]);
	const [end, setEnd] = useState(moment());

	return (
		<div>
			<Menu
				duration={duration}
				setDuration={setDuration}
				end={end}
				setEnd={setEnd}
			/>

			<Graphs
				end={end}
				duration={duration}
			/>
		</div>
	);
}

export default App;