"use client";
// components/main/analogInputs/AnalogInputsChart.tsx
import React, { useEffect, useRef } from "react";
import { useDispatch, useSelector } from "react-redux";
import { RootState, AppDispatch } from "@/redux/store";
import { Dialog } from "@headlessui/react";
import { Line } from "react-chartjs-2";
import {
  Chart as ChartJS,
  LineElement,
  PointElement,
  CategoryScale,
  LinearScale,
  Tooltip,
  Legend,
  Filler,
  TimeScale,
  TooltipItem,
} from "chart.js";
import "chartjs-adapter-date-fns";
import { de } from "date-fns/locale";
import { Listbox } from "@headlessui/react";
import { getAnalogInputsHistoryThunk } from "@/redux/thunks/getAnalogInputsHistoryThunk";
import {
  setVonDatum,
  setBisDatum,
  setZeitraum,
  setAutoLoad,
} from "@/redux/slices/analogInputs/analogInputsHistorySlice";
import { getColor } from "@/utils/colors";
import AnalogInputsDatePicker from "./AnalogInputsDatePicker";
import type { ChartJSOrUndefined } from "react-chartjs-2/dist/types";

// ✅ Nur die Basis-ChartJS-Module registrieren
ChartJS.register(
  LineElement,
  PointElement,
  CategoryScale,
  LinearScale,
  Tooltip,
  Legend,
  Filler,
  TimeScale
);

export default function AnalogInputsChart({
  setLoading,
  loading,
}: {
  setLoading: (loading: boolean) => void;
  loading: boolean;
}) {
  useEffect(() => {
    if (typeof window !== "undefined") {
      import("chartjs-plugin-zoom").then((zoom) => {
        if (!ChartJS.registry.plugins.get("zoom")) {
          ChartJS.register(zoom.default);
        }
      });
    }
  }, []);

  const dispatch = useDispatch<AppDispatch>();

  const chartRef =
    useRef<
      ChartJSOrUndefined<"line", { x: Date; y: number | undefined }[], unknown>
    >(null);

  // Redux Werte für Chart-Daten
  const { zeitraum, vonDatum, bisDatum, data, autoLoad, selectedId } =
    useSelector((state: RootState) => state.analogInputsHistory);
  const selectedAnalogInput = useSelector(
    (state: RootState) => state.selectedAnalogInput
  );

  // Redux initiale Datum-Werte
  const vonDatumRedux = useSelector(
    (state: RootState) => state.dateRangePicker.vonDatum
  );
  const bisDatumRedux = useSelector(
    (state: RootState) => state.dateRangePicker.bisDatum
  );

  // Hilfsfunktion für Default-Datum
  const getDefaultDate = (type: "from" | "to") => {
    const today = new Date();
    if (type === "to") return today.toISOString().slice(0, 10);
    const fromDateObj = new Date(today);
    fromDateObj.setDate(today.getDate() - 30);
    return fromDateObj.toISOString().slice(0, 10);
  };

  // ✅ Lokale States für Picker + Zeitraum
  const [localVonDatum, setLocalVonDatum] = React.useState(
    vonDatumRedux || getDefaultDate("from")
  );
  const [localBisDatum, setLocalBisDatum] = React.useState(
    bisDatumRedux || getDefaultDate("to")
  );
  const [localZeitraum, setLocalZeitraum] = React.useState(zeitraum);

  // Synchronisiere lokale Werte mit Redux (z.B. nach AutoLoad Reset)
  useEffect(() => {
    setLocalVonDatum(vonDatumRedux || getDefaultDate("from"));
    setLocalBisDatum(bisDatumRedux || getDefaultDate("to"));
    setLocalZeitraum(zeitraum);
  }, [vonDatumRedux, bisDatumRedux, zeitraum]);

  // Initiale Default-Werte: 30 Tage zurück (nur wenn Redux-Werte fehlen)
  useEffect(() => {
    if (!vonDatumRedux || !bisDatumRedux) {
      const today = new Date();
      const toDate = today.toISOString().slice(0, 10);
      const fromDateObj = new Date(today);
      fromDateObj.setDate(today.getDate() - 30);
      const fromDate = fromDateObj.toISOString().slice(0, 10);
      setLocalVonDatum(fromDate);
      setLocalBisDatum(toDate);
    }
  }, [vonDatumRedux, bisDatumRedux]);

  // ✅ Nur lokale Änderung beim Picker
  const handleDateChange = (from: string, to: string) => {
    setLocalVonDatum(from);
    setLocalBisDatum(to);
  };

  // ✅ Button → Redux + Fetch triggern
  const handleFetchData = () => {
    if (!selectedAnalogInput?.id) return;

    setLoading(true); // Set loading to true when fetching data

    // Fallback auf Redux-Werte, falls lokale Werte leer sind
    const from = localVonDatum || vonDatumRedux || "";
    const to = localBisDatum || bisDatumRedux || "";

    // Redux aktualisieren
    dispatch(setVonDatum(from));
    dispatch(setBisDatum(to));
    dispatch(setZeitraum(localZeitraum));

    // Umgebung erkennen und URL generieren
    const isDev =
      window.location.hostname === "localhost" ||
      window.location.hostname === "127.0.0.1";
    let fetchUrl = "";
    if (isDev) {
      fetchUrl = `/api/cpl/getAnalogInputsHistory?eingang=${selectedAnalogInput.id}&zeitraum=${localZeitraum}&von=${from}&bis=${to}`;
    } else {
      // Produktion: CPL-Webserver direkt abfragen
      const [vonJahr, vonMonat, vonTag] = from.split("-");
      const [bisJahr, bisMonat, bisTag] = to.split("-");
      const aeEingang = 100 + (selectedAnalogInput.id - 1);
      let diaType = "DIA1";
      if (localZeitraum === "DIA0") diaType = "DIA0";
      if (localZeitraum === "DIA2") diaType = "DIA2";
      fetchUrl = `${window.location.origin}/CPL?seite.ACP&${diaType}=${vonJahr};${vonMonat};${vonTag};${bisJahr};${bisMonat};${bisTag};${aeEingang};1`;
    }
    console.log("Fetch-URL:", fetchUrl);

    // Thunk-Fetch mit neuen Werten
    dispatch(
      getAnalogInputsHistoryThunk({
        eingang: selectedAnalogInput.id,
        zeitraum: localZeitraum,
        vonDatum: from,
        bisDatum: to,
      })
    ).finally(() => setLoading(false)); // Reset loading after fetch
  };

  // Auto-trigger fetch when a row is selected and id is not 0 (only once per selection)
  React.useEffect(() => {
    if (selectedAnalogInput?.id && selectedAnalogInput.id !== 0) {
      handleFetchData();
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [selectedAnalogInput?.id]);

  // ✅ Chart-Daten aus Redux filtern (Chart reagiert nur nach Button)
  const chartKey = selectedAnalogInput?.id
    ? String(selectedAnalogInput.id + 99)
    : null;
  const inputData = chartKey ? data[chartKey] ?? [] : [];

  const filteredData = inputData.filter((point) => {
    const date = new Date(point.t);
    const from = vonDatumRedux ? new Date(vonDatumRedux) : null;
    const to = bisDatumRedux ? new Date(bisDatumRedux) : null;
    return (!from || date >= from) && (!to || date <= to);
  });

  const memoizedChartData = React.useMemo(() => {
    return {
      datasets:
        filteredData.length > 0
          ? zeitraum === "DIA0"
            ? [
                {
                  label: "Minimum ", // (i)
                  data: filteredData
                    .filter((p) => typeof p.i === "number")
                    .map((p) => ({ x: new Date(p.t), y: p.i })),
                  borderColor: "gray",
                  borderDash: [4, 2],
                  borderWidth: 1,
                  pointRadius: 0,
                  tension: 0.1,
                },
                {
                  label: selectedAnalogInput?.label
                    ? //? `Messwert  ${selectedAnalogInput.label}` // (m)
                      `Messwert ` // (m)
                    : "Messwert ", // (m)
                  data: filteredData
                    .filter((p) => typeof p.m === "number")
                    .map((p) => ({ x: new Date(p.t), y: p.m })),
                  borderColor: getColor("littwin-blue"),
                  backgroundColor: "rgba(59,130,246,0.3)",
                  borderWidth: 2,
                  pointRadius: 0,
                  tension: 0.1,
                },
                {
                  label: "Maximum ", // (a)
                  data: filteredData
                    .filter((p) => typeof p.a === "number")
                    .map((p) => ({ x: new Date(p.t), y: p.a })),
                  borderColor: "gray",
                  borderDash: [4, 2],
                  borderWidth: 1,
                  pointRadius: 0,
                  tension: 0.1,
                },
              ]
            : [
                {
                  label: "Minimum", // (i)
                  data: filteredData
                    .filter((p) => typeof p.i === "number")
                    .map((p) => ({ x: new Date(p.t), y: p.i })),
                  borderColor: "gray",
                  borderDash: [4, 2],
                  borderWidth: 1,
                  pointRadius: 0,
                  tension: 0.1,
                },
                {
                  label: "Durchschnitt", // (g)
                  data: filteredData
                    .filter((p) => typeof p.g === "number")
                    .map((p) => ({ x: new Date(p.t), y: p.g })),
                  borderColor: getColor("littwin-blue"),
                  backgroundColor: "rgba(59,130,246,0.3)",
                  borderWidth: 2,
                  pointRadius: 0,
                  tension: 0.1,
                },
                {
                  label: "Maximum", // (a)
                  data: filteredData
                    .filter((p) => typeof p.a === "number")
                    .map((p) => ({ x: new Date(p.t), y: p.a })),
                  borderColor: "gray",
                  borderDash: [4, 2],
                  borderWidth: 1,
                  pointRadius: 0,
                  tension: 0.1,
                },
              ]
          : [],
    };
  }, [filteredData, zeitraum, selectedAnalogInput]);

  const memoizedChartOptions = React.useMemo(() => {
    return {
      responsive: true,
      maintainAspectRatio: false,
      plugins: {
        legend: { position: "top" as const },
        tooltip: {
          mode: "index" as const,
          intersect: false,
          callbacks: {
            label: (context: TooltipItem<"line">) => {
              const label = context.dataset.label || "";
              return `${label}: ${context.parsed.y}`;
            },
            title: (items: TooltipItem<"line">[]) => {
              const date = items[0].parsed.x;
              return `Zeitpunkt: ${new Date(date).toLocaleString("de-DE")}`;
            },
          },
        },
        title: {
          display: true,
          text: selectedAnalogInput?.label
            ? `Verlauf: ${selectedAnalogInput.label}`
            : "Messwert-Verlauf",
        },
        zoom: {
          pan: {
            enabled: true,
            mode: "x" as const,
          },
          zoom: {
            wheel: { enabled: true },
            pinch: { enabled: true },
            mode: "x" as const,
          },
        },
      },
      scales: {
        x: {
          type: "time" as const,
          time: {
            unit: "day" as const,
            tooltipFormat: "dd.MM.yyyy HH:mm",
            displayFormats: {
              day: "dd.MM.yyyy",
            },
          },
          adapters: { date: { locale: de } },
          title: { display: true, text: "Zeit" },
          min: vonDatum ? new Date(vonDatum).getTime() : undefined,
          max: bisDatum ? new Date(bisDatum).getTime() : undefined,
        },
        y: {
          title: {
            display: true,
            text: `Messwert ${selectedAnalogInput?.unit || ""}`,
          },
        },
      },
    };
  }, [vonDatum, bisDatum, selectedAnalogInput]);

  // ✅ AutoLoad nur beim ersten Laden
  useEffect(() => {
    if (autoLoad && selectedId) {
      dispatch(
        getAnalogInputsHistoryThunk({
          eingang: selectedId,
          zeitraum,
          vonDatum,
          bisDatum,
        })
      );
      dispatch(setAutoLoad(false));
    }
  }, [autoLoad, selectedId, dispatch, zeitraum, vonDatum, bisDatum]);

  // Dynamisches Importieren von chartjs-plugin-zoom nur im Browser
  useEffect(() => {
    if (typeof window !== "undefined") {
      import("chartjs-plugin-zoom").then((module) => {
        ChartJS.register(module.default);
      });
    }
  }, []);

  return (
    <div
      className={`flex flex-col gap-2 h-full ${loading ? "cursor-wait" : ""}`}
    >
      <div className="flex justify-between items-center p-2 bg-gray-100 rounded-lg space-x-2">
        <div className="flex justify-start">
          <Dialog.Title className="text-lg font-semibold text-gray-700">
            Eingang {selectedId ?? "–"}
          </Dialog.Title>
        </div>
        <div className="flex justify-end">
          <div className="flex flex-wrap items-center gap-4 mb-2">
            {/* ✅ Neuer DatePicker mit schönem Styling (lokal, ohne Redux) */}
            <AnalogInputsDatePicker
              from={localVonDatum}
              to={localBisDatum}
              onChange={handleDateChange}
            />

            {/* ✅ Zeitraum-Auswahl (Listbox nur lokal) */}
            <Listbox value={localZeitraum} onChange={setLocalZeitraum}>
              <div className="relative w-48">
                <Listbox.Button className="w-full border px-3 py-1 rounded bg-white flex justify-between items-center text-sm">
                  <span>
                    {localZeitraum === "DIA0"
                      ? "Alle Messwerte"
                      : localZeitraum === "DIA1"
                      ? "Stündlich"
                      : "Täglich"}
                  </span>
                  <i className="bi bi-chevron-down text-gray-400" />
                </Listbox.Button>
                <Listbox.Options className="absolute z-10 mt-1 w-full border bg-white shadow rounded text-sm">
                  {["DIA0", "DIA1", "DIA2"].map((option) => (
                    <Listbox.Option
                      key={option}
                      value={option}
                      className="px-4 py-1 cursor-pointer hover:bg-gray-200"
                    >
                      {option === "DIA0"
                        ? "Alle Messwerte"
                        : option === "DIA1"
                        ? "Stündlich"
                        : "Täglich"}
                    </Listbox.Option>
                  ))}
                </Listbox.Options>
              </div>
            </Listbox>

            {/* ✅ Button: lädt die Daten & aktualisiert Redux */}
            <button
              onClick={handleFetchData}
              className="px-4 py-1 bg-littwin-blue text-white rounded text-sm"
            >
              Daten laden
            </button>
          </div>
        </div>
      </div>

      {/* Chart-Anzeige */}
      <div className="flex-1 min-h-0 w-full">
        {!selectedAnalogInput?.id ? (
          <div className="flex items-center justify-center h-full text-gray-500 text-lg gap-2">
            <i className="bi bi-info-circle text-2xl mr-2" />
            <span>
              Bitte wählen Sie einen Eingang aus, um die Messkurve anzuzeigen
            </span>
          </div>
        ) : (
          <Line
            ref={chartRef}
            data={memoizedChartData}
            options={memoizedChartOptions}
            style={{ height: "100%", width: "100%" }}
          />
        )}
      </div>
    </div>
  );
}
