// components/main/kabelueberwachung/kue705FO/Charts/TDRChart/TDRChart.tsx
"use client";

import React, { useEffect, useRef, useMemo } from "react";
import { RootState } from "../../../../../../redux/store";
import { useSelector, useDispatch } from "react-redux";
import { AppDispatch } from "../../../../../../redux/store";
import { Chart, registerables } from "chart.js";
import "chartjs-adapter-date-fns";
import { getColor } from "../../../../../../utils/colors";
import TDRChartActionBar from "./TDRChartActionBar";
import { fetchReferenceCurveBySlotThunk } from "../../../../../../redux/thunks/fetchReferenceCurveBySlotThunk";

const TDRChart: React.FC<{ isFullScreen: boolean }> = ({ isFullScreen }) => {
  const dispatch = useDispatch<AppDispatch>();

  //---------------------------------
  const chartRef = useRef<HTMLCanvasElement>(null);
  const chartInstance = useRef<Chart | null>(null);

  // 🟢 **Hole den ausgewählten Slot und Messkurve aus Redux**
  const selectedId = useSelector(
    (state: RootState) => state.tdrDataById.selectedId
  );
  const selectedSlot = useSelector(
    (state: RootState) => state.kueChartMode.selectedSlot
  );
  const selectedChartType = useSelector(
    (state: RootState) => state.kueChartMode.activeMode
  );
  const tdrDataById = useSelector(
    (state: RootState) => state.tdrDataById.dataById
  );
  //--------------------------------
  const tdrInitialData =
    selectedId !== null && tdrDataById[selectedId]
      ? tdrDataById[selectedId]
      : [];

  //--------------------------------
  // Kombinierte Logik: ID hat Vorrang, sonst Initial-Daten für Slot
  const tdrChartData =
    selectedId !== null && tdrDataById[selectedId]
      ? tdrDataById[selectedId]
      : [];
  //--------------------------------
  const referenceChartData = useSelector((state: RootState) =>
    selectedSlot !== null
      ? state.tdrReferenceChartDataBySlot.referenceData[selectedSlot] || []
      : []
  );
  //--------------------------------
  useEffect(() => {
    if (selectedSlot !== null) {
      dispatch(fetchReferenceCurveBySlotThunk(selectedSlot));
    }
  }, [selectedSlot, dispatch]);

  //--------------------------------
  const tdmChartData = useSelector(
    (state: RootState) => state.tdmSingleChart.data
  );
  const pinDistance =
    selectedId !== null && Array.isArray(tdmChartData?.[selectedSlot ?? -1])
      ? tdmChartData[selectedSlot!].find((entry) => entry.id === selectedId)
          ?.d ?? null
      : null;

  //--------------------------------
  useEffect(() => {
    import("chartjs-plugin-zoom").then((zoomPlugin) => {
      Chart.register(...registerables, zoomPlugin.default);

      if (chartRef.current && tdrChartData.length > 0) {
        if (chartInstance.current) {
          chartInstance.current.destroy();
        }

        const ctx = chartRef.current.getContext("2d");
        if (ctx) {
          chartInstance.current = new Chart(ctx, {
            type: "line",
            data: {
              datasets: [
                {
                  label: `Modul ${
                    selectedSlot !== null ? selectedSlot + 1 : "?"
                  }`,
                  data: tdrChartData,
                  borderColor: getColor("littwin-blue"),
                  borderWidth: 1,
                  tension: 0.1,
                  parsing: {
                    xAxisKey: "d",
                    yAxisKey: "p",
                  },
                },
                {
                  label: "Referenzkurve",
                  data: referenceChartData,
                  borderColor: "black",
                  borderWidth: 1,
                  borderDash: [5, 5],
                  pointRadius: 3,
                  pointHoverRadius: 5,
                  pointBackgroundColor: "black",
                  tension: 0.1,
                  parsing: {
                    xAxisKey: "d",
                    yAxisKey: "p",
                  },
                },
                {
                  label: "Fehlerstelle",
                  data:
                    pinDistance !== null && typeof pinDistance === "number"
                      ? [{ d: pinDistance, p: 0 }]
                      : [],
                  borderColor: "red",
                  backgroundColor: "red",
                  pointRadius: 10,
                  pointStyle: "triangle", // Hier den korrekten Stil setzen
                  showLine: false,
                  clip: false, // Wenn du die Fehlerstelle sichtbar sehen möchtest
                  parsing: {
                    xAxisKey: "d",
                    yAxisKey: "p",
                  },
                  order: 9999,
                  // Hier die Reihenfolge der Marker bestimmen
                },
              ],
            },
            options: {
              responsive: true,
              maintainAspectRatio: false,
              animation: {
                duration: 150, // 150 ms Animation
              },
              scales: {
                x: {
                  type: "linear",
                  title: {
                    display: true,
                    text: "Entfernung (m)",
                  },
                },
                y: {
                  title: {
                    display: true,
                    text: "Pegel",
                  },
                },
              },
              plugins: {
                tooltip: {
                  yAlign: "bottom", // Tooltip oberhalb des Punktes
                  callbacks: {
                    title: () => "Fehlerstelle", // Kein Titel
                    label: function (context) {
                      const rawData = context.raw as { d: number; p: number };

                      // 👇 Unterscheide zwischen Mess- und Referenzkurve
                      if (context.dataset.label === "Referenzkurve") {
                        return [
                          `Referenzwert`,
                          `Entfernung: ${rawData.d.toFixed(0)} Meter`,
                          `Pegel: ${rawData.p.toFixed(2)}`,
                        ];
                      } else {
                        return [
                          `Messwert`,
                          `Entfernung: ${rawData.d.toFixed(0)} Meter`,
                          `Pegel: ${rawData.p.toFixed(2)}`,
                        ];
                      }
                    },
                  },
                },

                zoom: {
                  pan: {
                    enabled: true,
                    mode: "xy",
                  },
                  zoom: {
                    wheel: {
                      enabled: true,
                    },
                    pinch: {
                      enabled: true,
                    },
                    mode: "xy",
                  },
                },
              },
            },
          });
        }
      }
    });
  }, [
    JSON.stringify(tdrChartData),
    JSON.stringify(referenceChartData),
    selectedSlot,
    selectedChartType,
  ]);
  //--------------------------------------

  return (
    <div style={{ width: "100%", height: isFullScreen ? "90%" : "28rem" }}>
      <TDRChartActionBar />

      {tdrChartData.length === 0 ? (
        <div className="flex items-center justify-center h-full text-gray-500 italic">
          ⚠️ Keine Daten verfügbar für diesen Slot
        </div>
      ) : (
        <canvas ref={chartRef} style={{ width: "100%", height: "100%" }} />
      )}
    </div>
  );
};

export default TDRChart;
