import { useState, useEffect } from "react";
import { useRouter } from "next/router";
import { Card, CardHeader, CardContent, CardTitle, CardDescription, Button, Input, Textarea, Alert } from "../ui/components";
import { ChartBarIcon, ArrowDownTrayIcon as DownloadIcon, EyeIcon } from '@heroicons/react/24/outline';
import axios from "axios";

export default function Generator() {
	const [profil, setProfil] = useState();
	const [args, setArgs] = useState({
		scale: 200,
		elementOne: 0,
		elementTwo: 0,
	});
	const [isLoading, setIsLoading] = useState(false);
	const [previewVisible, setPreviewVisible] = useState(false);
	const { query } = useRouter();

	const ElementOneOptions = [
		{ label: "Nic", value: "0" },
		{ label: "Słup", value: "1" },
		{ label: "Dom", value: "2" },
	];
	
	const ElementTwoOptions = [
		{ label: "Nic", value: "0" },
		{ label: "Słup", value: "1" },
		{ label: "Dom", value: "2" },
	];

	useEffect(() => {
		if (query.external == "tru") {
			axios
				.post("/api/readtext", {
					id: query.id,
				})
				.then(function (response) {
					setProfil(response.data.data);
					document.getElementById("textarea-1").value = response.data.data;
					console.log(response.data.data);
				});
		}
	}, []);

	const getPath = (e, path) => {
		let newLines = [];

		for (let line of path.split("\n")) {
			if (line[0] == "P") continue;
			if (line[0] == "S") continue;
			if (line[0] == "X") continue;
			newLines.push(line);
		}
		
		let xs = [], ys = [], zs = [];
		let toti = 0, al = 0;
		
		for (let line of newLines) {
			al += 1;
			let theLine = line.split(",");
			
			if (xs && parseFloat(theLine[0]) == xs[-1] && parseFloat(theLine[1]) == ys[-1])
				continue;

			if (al > 2) {
				let dist = ((xs[xs.length - 1] - xs[xs.length - 2]) ** 2 +
					(ys[ys.length - 1] - ys[ys.length - 2]) ** 2) ** 0.5;
				toti += Math.round(dist);
			}
			xs.push(parseFloat(theLine[0]));
			ys.push(parseFloat(theLine[1]));
			zs.push(parseFloat(theLine[2]));
		}

		const canvas = document.getElementById("canvas");
		if (!canvas.getContext) {
			console.log("canvas err");
			return;
		}

		const ctx = canvas.getContext("2d");
		ctx.clearRect(0, 0, 700, 500);
		ctx.strokeStyle = "#3B82F6";
		ctx.lineWidth = 2;
		
		let scaleFactor = 100000 / 2000;
		let totalH = Math.max(...zs);
		let minH = Math.min(...zs);
		
		for (let line = 0; line < xs.length - 1; line++) {
			let x1 = line * scaleFactor;
			let y1 = zs[line];
			let x2 = (line + 1) * scaleFactor;
			let y2 = zs[line + 1];
			
			let b0 = 50, b1 = 450;
			let z1 = b0 + (b1 - b0) * ((y1 - totalH) / (minH - totalH));
			let z2 = b0 + (b1 - b0) * ((y2 - totalH) / (minH - totalH));
			
			let x12 = b0 + (b1 - b0) * ((x1 - 0) / (toti * scaleFactor));
			let x22 = b0 + (b1 - b0) * ((x2 - 0) / (toti * scaleFactor));

			ctx.beginPath();
			ctx.moveTo(x12, z1);
			ctx.lineTo(x22, z2);
			ctx.stroke();
		}
		setPreviewVisible(true);
	};

	const py = (e, profil, args) => {
		e.preventDefault();
		setIsLoading(true);

		axios
			.post("/api/spawn", {
				profil: profil,
				arguments: args,
			})
			.then(function (response) {
				setIsLoading(false);
				console.log(response);
				if (response.data.toString().startsWith("Py Error")) {
					alert("Błąd: " + response.data);
					return;
				}
				document.getElementById("down").download = response.data.filename.toString() + ".dxf";
				document.getElementById("down").click();
			})
			.catch(function (error) {
				setIsLoading(false);
				console.log(error);
			});
	};

	return (
		<div className="grid grid-cols-1 xl:grid-cols-2 gap-8">
			{/* Input Section */}
			<div className="space-y-6">
				<Card>
					<CardHeader>
						<CardTitle className="flex items-center space-x-2">
							<ChartBarIcon className="w-5 h-5 text-blue-600" />
							<span>Dane wejściowe</span>
						</CardTitle>
						<CardDescription>
							Wklej dane z Geoportalu lub wprowadź własne współrzędne
						</CardDescription>
					</CardHeader>
					<CardContent className="space-y-4">
						<Textarea
							id="textarea-1"
							label="Dane z Geoportalu"
							placeholder="Próbkowanie: 1 ..."
							rows={8}
							onChange={(e) => {
								setProfil(e.target.value);
								getPath(e, e.target.value);
							}}
							className="font-mono text-sm"
						/>

						<div className="grid grid-cols-1 md:grid-cols-3 gap-4">
							<Input
								label="Skala"
								placeholder="200"
								type="number"
								value={args.scale}
								onChange={(e) => setArgs({ ...args, scale: e.target.value })}
							/>

							<div>
								<label className="block text-sm font-medium text-gray-700 mb-1">
									Element lewy
								</label>
								<select
									className="block w-full rounded-lg border-gray-300 shadow-sm focus:border-blue-500 focus:ring-blue-500"
									value={args.elementOne}
									onChange={(e) => setArgs({ ...args, elementOne: e.target.value })}
								>
									{ElementOneOptions.map(option => (
										<option key={option.value} value={option.value}>
											{option.label}
										</option>
									))}
								</select>
							</div>

							<div>
								<label className="block text-sm font-medium text-gray-700 mb-1">
									Element prawy
								</label>
								<select
									className="block w-full rounded-lg border-gray-300 shadow-sm focus:border-blue-500 focus:ring-blue-500"
									value={args.elementTwo}
									onChange={(e) => setArgs({ ...args, elementTwo: e.target.value })}
								>
									{ElementTwoOptions.map(option => (
										<option key={option.value} value={option.value}>
											{option.label}
										</option>
									))}
								</select>
							</div>
						</div>

						<Button
							onClick={(e) => {
								const textareaValue = document.getElementById("textarea-1").value;
								if (textareaValue === "") {
									alert("Pole danych nie może być puste");
								} else if (!textareaValue.startsWith("Próbkowanie")) {
									alert("Błędne dane");
								} else {
									py(e, profil, args);
								}
							}}
							disabled={isLoading}
							loading={isLoading}
							className="w-full"
						>
							<DownloadIcon className="w-5 h-5 mr-2" />
							{isLoading ? 'Generowanie...' : 'Generuj profil'}
						</Button>
					</CardContent>
				</Card>
			</div>

			{/* Preview Section */}
			<div>
				<Card>
					<CardHeader>
						<CardTitle className="flex items-center space-x-2">
							<EyeIcon className="w-5 h-5 text-green-600" />
							<span>Podgląd profilu</span>
						</CardTitle>
						<CardDescription>
							Wizualizacja profilu terenu na podstawie wprowadzonych danych
						</CardDescription>
					</CardHeader>
					<CardContent>
						{previewVisible ? (
							<div className="bg-gray-50 rounded-lg p-4">
								<canvas 
									id="canvas" 
									height="500" 
									width="700"
									className="border border-gray-200 rounded bg-white"
								/>
							</div>
						) : (
							<div className="bg-gray-50 rounded-lg p-8 text-center">
								<div className="mx-auto w-16 h-16 bg-gray-200 rounded-full flex items-center justify-center mb-4">
									<ChartBarIcon className="w-8 h-8 text-gray-400" />
								</div>
								<p className="text-gray-500">Wprowadź dane aby zobaczyć podgląd profilu</p>
							</div>
						)}
					</CardContent>
				</Card>

				{/* Instructions */}
				<Card className="mt-6">
					<CardHeader>
						<CardTitle>Instrukcje</CardTitle>
					</CardHeader>
					<CardContent>
						<div className="space-y-3 text-sm">
							<div className="flex items-start space-x-3">
								<div className="flex-shrink-0 w-6 h-6 bg-blue-100 rounded-full flex items-center justify-center">
									<span className="text-xs font-semibold text-blue-600">1</span>
								</div>
								<p className="text-gray-600">Skopiuj dane z Geoportalu w formacie "Próbkowanie: 1"</p>
							</div>
							<div className="flex items-start space-x-3">
								<div className="flex-shrink-0 w-6 h-6 bg-blue-100 rounded-full flex items-center justify-center">
									<span className="text-xs font-semibold text-blue-600">2</span>
								</div>
								<p className="text-gray-600">Ustaw skalę i wybierz elementy dodatkowe</p>
							</div>
							<div className="flex items-start space-x-3">
								<div className="flex-shrink-0 w-6 h-6 bg-blue-100 rounded-full flex items-center justify-center">
									<span className="text-xs font-semibold text-blue-600">3</span>
								</div>
								<p className="text-gray-600">Kliknij "Generuj profil" aby pobrać plik DXF</p>
							</div>
						</div>
					</CardContent>
				</Card>
			</div>

			<a href="test.dxf" download="test.dxf" id="down" className="hidden" />
		</div>
	);
}