import { Button } from "../components/Button.tsx";
import { useEffect, useLayoutEffect, useRef } from "preact/hooks";
import { ComponentChildren } from "preact";
import { Signal, useSignal } from "@preact/signals";
import { IS_BROWSER } from "$fresh/runtime.ts";
import { mapValues } from "$std/collections/map_values.ts";
import { useAsync } from "../util/util.ts";
import {
  Coperation,
  CorpSimple,
  fetchKosdaqList,
  fetchKospiList,
  fetchPageInfo,
  PageCorpsInfo,
} from "../util/api.ts";

interface StockProps {
  pageName: string;
}

interface ToggleButtonProps {
  disabled?: boolean;
  toggle: Signal<boolean>;
  children?: ComponentChildren;
}

function ToggleButton(props: ToggleButtonProps) {
  const { disabled, toggle, ...rest } = props;
  return (
    <button
      {...rest}
      disabled={!IS_BROWSER || disabled}
      onClick={() => toggle.value = !toggle.value}
      class={"px-2 py-1 border-2 rounded transition-colors" + (
        toggle.value
          ? "border-gray-500 bg-white hover:bg-gray-200"
          : "border-gray-200 bg-gray-800 hover:bg-gray-500 text-white"
      )}
    />
  );
}

function StockListByDate(
  { prevSet, rows, name }: {
    prevSet: Set<string>;
    rows: Coperation[];
    name: string;
  },
) {
  const lastCount = useRef(rows.length);
  const curCount = rows.length;
  const parent = useRef<HTMLDivElement>(null);
  const controller = useRef<
    {
      isEnabled: () => boolean;
      disable: () => void;
      enable: () => void;
    } | undefined
  >();
  useEffect(() => {
    (async () => {
      console.log("animation mount on ", name);
      const { default: autoAnimate } = await import(
        "https://esm.sh/@formkit/auto-animate@0.7.0"
      );
      if (parent.current) {
        const cntr = autoAnimate(parent.current);
        controller.current = cntr;
      }
    })();
  }, [parent]);

  useLayoutEffect(() => {
    if (controller.current) {
      if (Math.abs(curCount - lastCount.current) > 200) {
        console.log("disable animation", curCount, "from", lastCount.current);
        controller.current.disable();
      } else {
        console.log("enable animation", curCount, "from", lastCount.current);
        controller.current.enable();
      }
      lastCount.current = curCount;
    }
  }, [parent, rows]);

  return (
    <div ref={parent}>
      <h2 class="text-lg">{name}</h2>
      {rows.map((row) => {
        const firstOccur = !prevSet.has(row.Code);
        return (
          <div
            key={row.Code}
            class={[
              "bg-white",
              firstOccur ? "text-[#ff5454] underline" : "text-black",
            ].join(" ")}
          >
            <a href={`https://stockplus.com/m/stocks/KOREA-A${row.Code}`}>
              {row.Name}
            </a>
          </div>
        );
      })}
    </div>
  );
}

function StockList({ data }: { data: PageCorpsInfo }) {
  console.log("data");

  const corpListByDate = data.corpListByDate;
  const keys = Object.keys(corpListByDate).sort().reverse().slice(0, 5)
    .reverse();
  const sets = keys.map((x) => new Set(corpListByDate[x].map((y) => y.Code)));
  //const rows = data.corpListbyDate;
  return (
    <div class="flex">
      {keys.map((x, i) => {
        const prevSet = i == 0 ? new Set<string>() : sets[i - 1];
        const rows = corpListByDate[x];
        return (
          <StockListByDate key={x} name={x} prevSet={prevSet} rows={rows} />
        );
      })}
    </div>
  );
}

type FilterInfoOption = {
  list: {
    items: CorpSimple[];
    include: boolean;
  }[];
  otherwise: boolean;
};

function filterInfo(info: Coperation[], filterList: FilterInfoOption) {
  const checkMap = new Map<string, boolean>();
  for (const l of filterList.list) {
    for (const i of l.items) {
      checkMap.set(i.code, l.include);
    }
  }
  return info.filter((x) => {
    const v = checkMap.get(x.Code);
    if (v === undefined) {
      return filterList.otherwise;
    } else {
      return v;
    }
  });
}

export default function StockListUI(props: StockProps) {
  const sig = useAsync<[PageCorpsInfo, CorpSimple[], CorpSimple[]]>(() =>
    Promise.all([
      fetchPageInfo(props.pageName),
      fetchKospiList(),
      fetchKosdaqList(),
    ])
  );
  const viewKospi = useSignal(true);
  const viewKosdaq = useSignal(false);
  const viewOtherwise = useSignal(false);
  return (
    <div class="my-2">
      <div class="flex gap-2">
        <ToggleButton toggle={viewKospi}>Kospi</ToggleButton>
        <ToggleButton toggle={viewKosdaq}>Kosdaq</ToggleButton>
        <ToggleButton toggle={viewOtherwise}>Otherwise</ToggleButton>
      </div>
      <div class="flex gap-8 py-6 flex-col">
        {sig.value.type == "loading"
          ? (new Array(20).fill(0).map((_) => (
            <div class="animate-pulse bg-gray-300 p-2"></div>
          )))
          : (
            <div>
              {sig.value.type == "error"
                ? (
                  <div>
                    <p>File Loading Failed</p>
                  </div>
                )
                : (
                  <StockList
                    data={applyFilter(
                      sig.value.data[0],
                      sig.value.data[1],
                      sig.value.data[2],
                    )}
                  />
                )}
            </div>
          )}
      </div>
    </div>
  );
  function applyFilter(
    data: PageCorpsInfo,
    kospi: CorpSimple[],
    kosdaq: CorpSimple[],
  ): PageCorpsInfo {
    const filter = getFilters(kospi, kosdaq);
    return {
      name: data.name,
      description: data.description,
      corpListByDate: mapValues(data.corpListByDate, (it: Coperation[]) => {
        return filterInfo(it, filter);
      }),
    };
  }
  function getFilters(
    kospi: CorpSimple[],
    kosdaq: CorpSimple[],
  ): FilterInfoOption {
    return {
      otherwise: viewOtherwise.value,
      list: [{
        include: viewKospi.value,
        items: kospi,
      }, {
        include: viewKosdaq.value,
        items: kosdaq,
      }],
    };
  }
}