import React, { useMemo } from "react";
import { useCurrentFrame, useVideoConfig, interpolate } from "remotion";

import type { CashFlowData } from "./CashFlowChart";
import { CashFlowChart } from "./CashFlowChart";
import { LifePlanChart } from "./LifePlanChart";
import type { YearlySnapshot } from "./types";
import { UnifiedHUD } from "./UnifiedHUD";

interface DualChartViewProps {
  absoluteFrame?: number;
  chartStartFrame?: number;
  chartEndFrame?: number;
  cashflowData?: {
    timeline: Array<
      CashFlowData & {
        totalExpense: number;
        netCashFlow: number;
        assetBalance: number;
      }
    >;
    meta: {
      currencyUnit: string;
    };
  };
}

export const DualChartView: React.FC<DualChartViewProps> = ({
  absoluteFrame,
  chartStartFrame,
  chartEndFrame,
  cashflowData = { timeline: [], meta: { currencyUnit: "万円" } },
}) => {
  const frame = useCurrentFrame();
  const { fps } = useVideoConfig(); // durationInFrames removed since we use chartEndFrame

  // Use absolute frame if provided to maintain animation continuity across segments
  const currentFrame = absoluteFrame !== undefined ? absoluteFrame : frame;

  // --- Unified Animation Logic (Both charts sync) ---
  // Animation should start at chartStartFrame and end at chartEndFrame
  const start = chartStartFrame !== undefined ? chartStartFrame : 0;
  // Fallback to absolute video end if no specific end frame provided
  const end = chartEndFrame !== undefined ? chartEndFrame : 300 * fps; 

  const exactProgress = interpolate(
    currentFrame,
    [start, end],
    [0, cashflowData.timeline.length - 1],
    { extrapolateRight: "clamp", extrapolateLeft: "clamp" },
  );

  const dataEndIndex = Math.floor(exactProgress);
  const yearProgress = exactProgress - dataEndIndex;

  // Current data for HUD
  const currentData =
    cashflowData.timeline[dataEndIndex] || cashflowData.timeline[0];

  // --- Convert cashflow data to LifePlanChart format ---
  // useMemo prevents re-creating this array every frame, which causes chart flickering
  const lifePlanTimeline: YearlySnapshot[] = useMemo(
    () =>
      cashflowData.timeline.map((item) => ({
        year: item.year,
        ages: {
          rep: item.age,
          spouse: undefined, // No spouse data in cashflow
        },
        financials: {
          income: item.income.total,
          expenditure: item.totalExpense,
          assetBalance: item.assetBalance,
        },
        events: [],
        isCritical: item.assetBalance < 0,
      })),
    [cashflowData.timeline],
  );

  // Memoize meta object to prevent re-creating it every frame
  const lifePlanMeta = useMemo(
    () => ({
      currencyUnit: cashflowData.meta.currencyUnit,
      startYear: cashflowData.timeline[0].year,
    }),
    [cashflowData.meta.currencyUnit, cashflowData.timeline],
  );

  return (
    <div
      style={{
        width: "100%",
        height: "100%",
        backgroundColor: "white",
        display: "flex",
        flexDirection: "column",
        gap: "20px",
        padding: "20px",
      }}
    >
      {/* --- Upper Chart: LifePlan (Asset Balance Trend) --- */}
      <div
        style={{
          flex: 1,
          backgroundColor: "white",
          border: "2px solid #e2e8f0",
          borderRadius: "8px",
          overflow: "hidden",
          display: "flex",
          flexDirection: "column",
        }}
      >
        <div
          style={{
            padding: "10px 20px",
            borderBottom: "2px solid #e2e8f0",
            background: "#4299E1",
          }}
        >
          <h3
            style={{
              margin: 0,
              fontSize: "16px",
              fontWeight: "700",
              color: "white",
            }}
          >
            資産残高推移
          </h3>
        </div>
        <div style={{ flex: 1, minHeight: 0 }}>
          <LifePlanChart
            key="lifeplan-chart"
            timeline={lifePlanTimeline}
            meta={lifePlanMeta}
            hideHeader={true}
            externalDataIndex={dataEndIndex}
            externalFraction={yearProgress}
          />
        </div>
      </div>

      {/* --- Lower Chart: CashFlow (Income vs Expenses) --- */}
      <div
        style={{
          flex: 1,
          backgroundColor: "white",
          border: "2px solid #e2e8f0",
          borderRadius: "8px",
          overflow: "hidden",
          display: "flex",
          flexDirection: "column",
        }}
      >
        <div
          style={{
            padding: "10px 20px",
            borderBottom: "2px solid #e2e8f0",
            background: "#ED8936",
          }}
        >
          <h3
            style={{
              margin: 0,
              fontSize: "16px",
              fontWeight: "700",
              color: "white",
            }}
          >
            収支明細
          </h3>
        </div>
        <div style={{ flex: 1, minHeight: 0 }}>
          <CashFlowChart
            key="cashflow-chart"
            timeline={cashflowData.timeline}
            meta={cashflowData.meta}
            hideHeader={true}
            externalDataIndex={dataEndIndex}
            externalYearProgress={yearProgress}
          />
        </div>
      </div>
    </div>
  );
};