/**
 * RecommendationPanel.tsx — 분석 종목 스캐너 패널 컴포넌트
 *
 * 역할:
 * - 배치 분석(batch_daily_analysis) 결과 종목 목록 표시
 * - 각 종목의 등락률, RSI, 스토캐스틱, 점수, 신호 표시
 * - 보유/매수중/신호 배지로 종목 상태 시각화
 * - 종목 클릭 시 차트/AI분석 패널 전환
 *
 * 데이터 흐름:
 * - 추천 데이터: react-query 'rule-based-recommendations' (2분 폴링)
 * - 보유 종목 Set: Dashboard에서 useMemo로 안정화 후 전달
 * - 실시간 가격: livePrices로 현재가 갱신
 *
 * 최적화:
 * - RecommendationItem, RecommendationPanel 모두 React.memo 적용
 */
import React, { useState } from 'react'
import { RefreshCw } from 'lucide-react'
import { RecommendationsData, RecommendedStock, Recommendation } from '../types/trading'
import { formatTime } from '../utils/formatUtils'

/** RecommendationItem Props 정의 */
interface RecommendationItemProps {
    stock: RecommendedStock
    idx: number
    selectedStock: string
    onSelectStock: (code: string) => void
    onRefetchAiAnalysis: () => void
    isRecommended: boolean
    isHeld: boolean
    isPending: boolean
    livePrices: Record<string, number> | undefined
    onBuy: (stockCode: string, stockName: string) => Promise<void>
}

const RecommendationItem = React.memo(({
    stock,
    idx,
    selectedStock,
    onSelectStock,
    onRefetchAiAnalysis,
    isRecommended,
    isHeld,
    isPending,
    livePrices,
    onBuy,
}: RecommendationItemProps) => {
    const changeRate = stock.change_rate || 0
    const isSelected = selectedStock === stock.stock_code
    const isUp = changeRate >= 0
    const [buying, setBuying] = useState(false)

    const handleBuyClick = async (e: React.MouseEvent<HTMLButtonElement>) => {
        e.stopPropagation()
        if (buying) return
        if (!window.confirm(`${stock.stock_name} 시장가 매수할까요?\n(수량: 총자산 × 종목당 최대비중으로 자동 산출)`)) return
        setBuying(true)
        try {
            await onBuy(stock.stock_code, stock.stock_name)
        } catch (error: unknown) {
            const err = error as any
            alert(`매수 실패: ${err.response?.data?.detail || err.message}`)
        } finally {
            setBuying(false)
        }
    }

    return (
        <div
            className={`w-full text-left transition-colors border-l-2 ${
                isSelected
                    ? 'bg-[#0d1e33] border-[#2b65d9]'
                    : 'border-transparent hover:bg-[#0a1628]'
            }`}
        >
            <div
                onClick={() => {
                    if (isSelected) onRefetchAiAnalysis()
                    else onSelectStock(stock.stock_code)
                }}
                className="px-3 pt-1.5 pb-1 cursor-pointer"
            >
                {/* Row 1: rank + name + badge + change% */}
                <div className="flex items-center gap-1.5 mb-0.5">
                    <span className="text-[8px] font-mono text-[#2a3d55] w-4 flex-shrink-0 text-right">{idx + 1}</span>
                    <span className={`text-[11px] font-semibold truncate flex-1 ${isSelected ? 'text-[#5b9aff]' : 'text-[#c5d5e8]'}`}>
                        {stock.stock_name}
                    </span>
                    {isPending ? (
                        <span className="text-[8px] text-[#f97316] bg-[#f97316]/10 px-1 py-px rounded-sm flex items-center gap-0.5 flex-shrink-0">
                            <RefreshCw className="w-2 h-2 animate-spin" />매수중
                        </span>
                    ) : isHeld ? (
                        <span className="text-[8px] text-[#5b9aff] bg-[#5b9aff]/10 px-1 py-px rounded-sm flex-shrink-0">보유</span>
                    ) : isRecommended ? (
                        <span className="text-[8px] text-[#22c55e] bg-[#22c55e]/10 px-1 py-px rounded-sm flex-shrink-0">신호</span>
                    ) : null}
                    <span className={`text-[10px] font-mono font-bold flex-shrink-0 ${isUp ? 'text-[#e84444]' : 'text-[#3d7eff]'}`}>
                        {changeRate > 0 ? '+' : ''}{changeRate.toFixed(2)}%
                    </span>
                </div>

                {/* Row 2: code + price + RSI + score */}
                <div className="flex items-center gap-2 pl-5">
                    <span className="text-[9px] font-mono text-[#3a5570]">{stock.stock_code}</span>
                    <span className="text-[9px] font-mono text-[#4a6580]">
                        {Math.round(livePrices?.[stock.stock_code] ?? stock.current_price ?? 0).toLocaleString()}원
                    </span>
                    {stock.rsi != null && (
                        <span className={`text-[8px] font-mono ${stock.rsi < 30 ? 'text-[#22c55e]' : stock.rsi > 70 ? 'text-[#e84444]' : 'text-[#4a6580]'}`}>
                            RSI {stock.rsi.toFixed(0)}
                        </span>
                    )}
                    {stock.stochastic_k != null && (
                        <span className="text-[8px] font-mono text-[#4a6580]">K {stock.stochastic_k.toFixed(0)}</span>
                    )}
                    {(stock.score ?? 0) > 0 && (
                        <span className="text-[8px] font-mono text-[#9f7aea]">{stock.score}pt</span>
                    )}
                </div>

                {/* Row 3: signals */}
                {stock.signals && stock.signals.length > 0 && (
                    <div className="pl-5 mt-0.5">
                        <span className="text-[8px] text-[#3a5570] truncate block">
                            {stock.signals.slice(0, 2).join(' · ')}
                        </span>
                    </div>
                )}
            </div>

            {/* Buy button — 보유/매수중 종목은 숨김 (PortfolioPanel 청산 버튼과 동일 스타일) */}
            {!isHeld && !isPending && (
                <div className="px-3 pb-1.5 pl-8">
                    <button
                        onClick={handleBuyClick}
                        disabled={buying}
                        className="w-full py-0.5 text-[9px] font-mono text-[#3a5570] hover:text-[#e84444] border border-[#152035] hover:border-[#e84444]/40 rounded-sm transition-colors disabled:opacity-50"
                    >
                        {buying ? '매수 주문 중...' : '매수 (시장가)'}
                    </button>
                </div>
            )}
        </div>
    )
})

RecommendationItem.displayName = 'RecommendationItem'

/** RecommendationPanel Props 정의 */
interface RecommendationPanelProps {
    /** 배치 분석 추천 데이터 */
    recommendations: RecommendationsData | undefined
    /** API 에러 여부 */
    isError: boolean
    /** 추천 데이터 새로고침 콜백 */
    onRefetch: () => void
    /** 현재 선택된 종목 코드 */
    selectedStock: string
    /** 종목 선택 콜백 */
    onSelectStock: (code: string) => void
    /** AI 분석 새로고침 콜백 */
    onRefetchAiAnalysis: () => void
    /** 보유 중인 종목 코드 Set (보유 배지 표시용) */
    heldStockCodes: Set<string>
    /** 매수 진행 중인 종목 코드 Set (매수중 배지 표시용) */
    pendingBuyStockCodes: Set<string>
    /** 실시간 가격 맵 */
    livePrices: Record<string, number> | undefined
    /** 수동 매수 콜백 */
    onBuy: (stockCode: string, stockName: string) => Promise<void>
}

const RecommendationPanel = React.memo(({
    recommendations,
    isError,
    onRefetch,
    selectedStock,
    onSelectStock,
    onRefetchAiAnalysis,
    heldStockCodes,
    pendingBuyStockCodes,
    livePrices,
    onBuy,
}: RecommendationPanelProps) => {
    return (
        <div className="bg-[#0c1522] border border-[#152035] rounded overflow-hidden flex flex-col h-1/2">
            {/* Header */}
            <div className="px-3 py-2 border-b border-[#152035] bg-[#091018] flex justify-between items-center flex-shrink-0">
                <h3 className="text-[#9f7aea] text-xs font-semibold uppercase tracking-wider">
                    분석 종목 스캐너
                </h3>
                <div className="flex items-center gap-2">
                    {recommendations?.batch_time && (
                        <span className="text-[9px] text-[#3a5570] font-mono">
                            {formatTime(recommendations.batch_time)}
                        </span>
                    )}
                    <span className="text-[8px] font-mono text-[#9f7aea] bg-[#9f7aea]/10 px-1.5 py-px rounded-sm">
                        {recommendations?.analyzed_stocks || 0}
                    </span>
                    <button
                        onClick={onRefetch}
                        className="p-1 text-[#3a5570] hover:text-[#9f7aea] transition-colors"
                        title="새로고침"
                    >
                        <RefreshCw className="w-3 h-3" />
                    </button>
                </div>
            </div>

            {/* List */}
            <div className="divide-y divide-[#0f1e2e] overflow-y-auto custom-scrollbar flex-1">
                {isError ? (
                    <div className="h-full flex flex-col items-center justify-center text-xs p-4 text-center">
                        <p className="text-[#e84444]">⚠ API 오류</p>
                        <p className="text-[8px] text-[#3a5570] mt-1">백엔드 로그 확인 필요</p>
                        <button onClick={onRefetch} className="mt-2 px-2 py-0.5 text-[#e84444] border border-[#e84444]/30 rounded-sm text-[9px] font-mono">재시도</button>
                    </div>
                ) : recommendations === undefined ? (
                    <div className="h-full flex flex-col items-center justify-center text-[#3a5570] text-xs p-4 text-center">
                        <RefreshCw className="w-5 h-5 animate-spin mb-2 text-[#9f7aea]" />
                        <p>로딩 중...</p>
                        <p className="text-[9px] text-[#2a3d55] mt-1">최초 로딩 시 10초 정도 소요됩니다</p>
                    </div>
                ) : (recommendations?.analyzed_stock_list || []).length > 0 ? (
                    (recommendations.analyzed_stock_list).map((stock: RecommendedStock, idx: number) => {
                        const isRecommended = (recommendations?.recommendations || []).some((r: Recommendation) => r.stock_code === stock.stock_code)
                        const isHeld = heldStockCodes.has(stock.stock_code)
                        const isPending = pendingBuyStockCodes.has(stock.stock_code)
                        return (
                            <RecommendationItem
                                key={`${stock.stock_code}-${idx}`}
                                stock={stock}
                                idx={idx}
                                selectedStock={selectedStock}
                                onSelectStock={onSelectStock}
                                onRefetchAiAnalysis={onRefetchAiAnalysis}
                                isRecommended={isRecommended}
                                isHeld={isHeld}
                                isPending={isPending}
                                livePrices={livePrices}
                                onBuy={onBuy}
                            />
                        )
                    })
                ) : (
                    <div className="h-full flex flex-col items-center justify-center text-[#3a5570] p-4 text-center">
                        <p className="text-xs">배치 분석 데이터 없음</p>
                        <p className="text-[9px] text-[#2a3d55] mt-1">make batch-test 실행 필요</p>
                    </div>
                )}
            </div>
        </div>
    )
})

RecommendationPanel.displayName = 'RecommendationPanel'
export default RecommendationPanel