/**
 * 위젯 대시보드 — 종목·매매 상태 공유
 */
import React, {
  createContext, useCallback, useContext, useEffect, useMemo, useState,
} from 'react';
import type { PaperSummaryDto, PaperTradeDto, StrategyDto } from '../utils/backendApi';
import type { TickerData, MarketInfo } from '../hooks/useMarketTicker';
import type { TradeOrderFillRequest } from '../types';
import type { Theme } from '../types';
import type { ChartRealtimeSource } from '../hooks/useChartRealtimeData';

export interface WidgetDashboardContextValue {
  theme: Theme;
  selectedMarket: string;
  setSelectedMarket: (m: string) => void;
  tickers: Map<string, TickerData>;
  marketInfos: MarketInfo[];
  marketLoading: boolean;
  usdRate: number;
  strategies: StrategyDto[];
  selectedStrategyId: number | null;
  setSelectedStrategyId: (id: number | null) => void;
  summary: PaperSummaryDto | null;
  trades: PaperTradeDto[];
  refreshPaperData: () => void;
  tradePrice: number | null;
  fillBuy: TradeOrderFillRequest | null;
  fillSell: TradeOrderFillRequest | null;
  setFillBuy: (r: TradeOrderFillRequest | null) => void;
  setFillSell: (r: TradeOrderFillRequest | null) => void;
  paperTradingEnabled: boolean;
  paperAutoTradeEnabled: boolean;
  onPaperOrderFilled?: () => void;
  chartRealtimeSource: ChartRealtimeSource;
}

const WidgetDashboardContext = createContext<WidgetDashboardContextValue | null>(null);

export function useWidgetDashboard(): WidgetDashboardContextValue {
  const ctx = useContext(WidgetDashboardContext);
  if (!ctx) throw new Error('useWidgetDashboard must be used within WidgetDashboardProvider');
  return ctx;
}

export function useWidgetDashboardOptional(): WidgetDashboardContextValue | null {
  return useContext(WidgetDashboardContext);
}

interface ProviderProps {
  theme: Theme;
  tickers: Map<string, TickerData>;
  marketInfos: MarketInfo[];
  marketLoading: boolean;
  usdRate: number;
  defaultMarket: string;
  strategies: StrategyDto[];
  summary: PaperSummaryDto | null;
  trades: PaperTradeDto[];
  refreshPaperData: () => void;
  paperTradingEnabled: boolean;
  paperAutoTradeEnabled: boolean;
  onPaperOrderFilled?: () => void;
  chartRealtimeSource: ChartRealtimeSource;
  children: React.ReactNode;
}

export const WidgetDashboardProvider: React.FC<ProviderProps> = ({
  theme,
  tickers,
  marketInfos,
  marketLoading,
  usdRate,
  defaultMarket,
  strategies,
  summary,
  trades,
  refreshPaperData,
  paperTradingEnabled,
  paperAutoTradeEnabled,
  onPaperOrderFilled,
  chartRealtimeSource,
  children,
}) => {
  const [selectedMarket, setSelectedMarket] = useState(defaultMarket);
  const [selectedStrategyId, setSelectedStrategyId] = useState<number | null>(null);

  useEffect(() => {
    if (defaultMarket) setSelectedMarket(defaultMarket);
  }, [defaultMarket]);
  const [fillBuy, setFillBuy] = useState<TradeOrderFillRequest | null>(null);
  const [fillSell, setFillSell] = useState<TradeOrderFillRequest | null>(null);

  const tradePrice = useMemo(() => {
    const t = tickers.get(selectedMarket);
    return t?.tradePrice ?? null;
  }, [tickers, selectedMarket]);

  const value = useMemo<WidgetDashboardContextValue>(() => ({
    theme,
    selectedMarket,
    setSelectedMarket,
    tickers,
    marketInfos,
    marketLoading,
    usdRate,
    strategies,
    selectedStrategyId,
    setSelectedStrategyId,
    summary,
    trades,
    refreshPaperData,
    tradePrice,
    fillBuy,
    fillSell,
    setFillBuy,
    setFillSell,
    paperTradingEnabled,
    paperAutoTradeEnabled,
    onPaperOrderFilled,
    chartRealtimeSource,
  }), [
    theme, selectedMarket, tickers, marketInfos, marketLoading, usdRate,
    strategies, selectedStrategyId, summary, trades, refreshPaperData,
    tradePrice, fillBuy, fillSell, paperTradingEnabled, paperAutoTradeEnabled,
    onPaperOrderFilled, chartRealtimeSource,
  ]);

  return (
    <WidgetDashboardContext.Provider value={value}>
      {children}
    </WidgetDashboardContext.Provider>
  );
};

export function useWidgetOrderbookFillHandler(): (price: number, rowType: 'ask' | 'bid') => void {
  const ctx = useWidgetDashboard();
  return useCallback((price: number, rowType: 'ask' | 'bid') => {
    const side = rowType === 'bid' ? 'buy' : 'sell';
    const req: TradeOrderFillRequest = { market: ctx.selectedMarket, price, side, seq: Date.now() };
    if (side === 'buy') ctx.setFillBuy(req);
    else ctx.setFillSell(req);
  }, [ctx]);
}