"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 { Line, ChartJSOrUndefined } 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";

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

export default function AnalogInputsChart() {
  const dispatch = useDispatch<AppDispatch>();
  const chartRef = useRef<ChartJSOrUndefined<"line"> | null>(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
  );

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

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

  // Initiale Default-Werte: 30 Tage zurück
  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);
    }
  }, []);

  // ✅ 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;

    // Redux aktualisieren
    dispatch(setVonDatum(localVonDatum));
    dispatch(setBisDatum(localBisDatum));
    dispatch(setZeitraum(localZeitraum));

    // Debug anzeigen
    console.log(
      "Fetch-URL:",
      `/api/cpl/getAnalogInputsHistory?eingang=${selectedAnalogInput.id}&zeitraum=${localZeitraum}&von=${localVonDatum}&bis=${localBisDatum}`
    );

    // Thunk-Fetch mit neuen Werten
    dispatch(
      getAnalogInputsHistoryThunk({
        eingang: selectedAnalogInput.id,
        zeitraum: localZeitraum,
        vonDatum: localVonDatum,
        bisDatum: localBisDatum,
      })
    );
  };

  // ✅ 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: selectedAnalogInput?.label
                    ? `Messwert (m) ${selectedAnalogInput.label}`
                    : "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: "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: "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: "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: "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,
                },
              ]
          : [],
    };
  }, [filteredData, zeitraum, selectedAnalogInput]);

  const memoizedChartOptions = React.useMemo(() => {
    return {
      responsive: true,
      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-3">
      <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>

      {/* Chart-Anzeige */}
      <div className="h-[50vh] 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}
          />
        )}
      </div>
    </div>
  );
}