import React, { useState, useEffect } from "react";
import { GetServerSidePropsContext } from "next";
import { OpenSourceHeatmapProps } from "../../types/heatmap";
import { generateCalendarData } from "../../utils/calendar";
import Heatmap from "../../components/Heatmap";
import { fetchUserData, fetchAuthorData } from "../../utils/authors";

const DEFAULT_COLOR = "#FF9D00";

const OpenSourceHeatmap: React.FC<OpenSourceHeatmapProps> = ({
  calendarData,
  providers,
}) => {
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
    if (calendarData && Object.keys(calendarData).length > 0) {
      setIsLoading(false);
    }
  }, [calendarData]);

  return (
    <div className="w-full max-w-screen-lg mx-auto p-4">
      {isLoading ? (
        <p className="text-center">Loading...</p>
      ) : (
        <div>
          {Object.entries(providers)
            .sort(
              ([keyA], [keyB]) =>
                calendarData[keyB].reduce((sum, day) => sum + day.count, 0) -
                calendarData[keyA].reduce((sum, day) => sum + day.count, 0)
            )
            .map(([providerName, { color, fullName, avatarUrl }]) => (
              <Heatmap
                key={providerName}
                data={calendarData[providerName]}
                color={color}
                providerName={providerName}
                fullName={fullName ?? providerName}
                avatarUrl={avatarUrl ?? ''}
              />
            ))}
        </div>
      )}
    </div>
  );
};

export async function getServerSideProps(context: GetServerSidePropsContext) {
  const { author, color } = context.query;

  const authorColor = color || DEFAULT_COLOR;

  try {
    const { fullName, avatarUrl } = await fetchUserData([author as string]);

    const providers = {
      [author as string]: {
        color: authorColor as string,
        authors: [author as string],
        fullName,
        avatarUrl,
      },
    };

    const flatData = await fetchAuthorData(author as string);
    const calendarData = generateCalendarData(flatData, [providers[author as string]]);

    return {
      props: {
        calendarData,
        color: authorColor,
        providers,
      },
    };
  } catch (error) {
    console.error("Error fetching data:", error);
    return {
      props: {
        calendarData: {},
        color: authorColor,
        providers: {
          [author as string]: {
            color: authorColor as string,
            authors: [author as string],
            fullName: author,
            avatarUrl: null,
          },
        },
      },
    };
  }
}

export default OpenSourceHeatmap;