//Lib
import {
    Chart as ChartJS,
    CategoryScale,
    LinearScale,
    BarElement,
    Title,
    Tooltip,
    Legend,
} from 'chart.js';
import { Bar } from 'react-chartjs-2';
import { useState, useEffect } from 'react';

export default function StorageUsedChartBar() {
    //States
    const [data, setData] = useState([]);

    //LifeCycle
    useEffect(() => {
        const dataFetch = async () => {
            try {
                const response = await fetch('/api/repo', {
                    method: 'GET',
                    headers: {
                        'Content-type': 'application/json',
                    },
                });
                setData((await response.json()).repoList);
            } catch (error) {
                console.log('Fetching datas error');
            }
        };

        dataFetch();
    }, []);

    ////Chart.js
    ChartJS.register(
        CategoryScale,
        LinearScale,
        BarElement,
        Title,
        Tooltip,
        Legend
    );

    const options = {
        responsive: true,
        plugins: {
            legend: {
                position: 'bottom',
            },
            title: {
                position: 'bottom',
                display: true,
                text: 'Storage used for each repository',
            },
        },
        scales: {
            y: {
                max: 100,
                min: 0,
                ticks: {
                    // Include a dollar sign in the ticks
                    callback: function (value) {
                        return value + '%';
                    },
                    stepSize: 10,
                },
            },
        },
    };

    const labels = data.map((repo) => repo.alias);

    const dataChart = {
        labels,
        datasets: [
            {
                label: 'Storage used (%)',
                //storageUsed is in octet, storageSize is in GB. Round to 1 decimal for %.
                data: data.map((repo) =>
                    (
                        ((repo.storageUsed / 1000000) * 100) /
                        repo.storageSize
                    ).toFixed(1)
                ),
                backgroundColor: '#704dff',
            },
        ],
    };

    return <Bar options={options} data={dataChart} />;
}