'use client'

import { useState, useEffect, useRef, useCallback } from 'react'
import {
  AreaChart,
  Area,
  XAxis,
  YAxis,
  CartesianGrid,
  Tooltip,
  ReferenceLine,
  ReferenceDot,
  ResponsiveContainer,
} from 'recharts'
import { TrendingUp, TrendingDown, RefreshCw, Eye } from 'lucide-react'

// ─── Types ────────────────────────────────
interface PricePoint {
  date: string
  open: number
  close: number
  high: number
  low: number
  volume: number
}

interface TradeMarker {
  type: 'BUY' | 'SELL'
  date: string
  price: number
}

interface PositionChartProps {
  symbol: string
  entryPrice: number
  entryDate: string
  quantity: number
  /** Closed trades to show SELL markers */
  exitPrice?: number
  exitDate?: string
  exitReason?: string
  /** Polling intervals in ms */
  priceRefreshMs?: number
  chartRefreshMs?: number
}

// ─── Formatting ───────────────────────────
function fmtMoney(n: number) {
  return new Intl.NumberFormat('tr-TR', {
    style: 'currency',
    currency: 'TRY',
    minimumFractionDigits: 2,
  }).format(n)
}

// ─── Custom Tooltip ───────────────────────
function ChartTooltip({ active, payload, label }: { active?: boolean; payload?: Array<{ value: number }>; label?: string }) {
  if (!active || !payload?.length) return null
  return (
    <div className="bg-gray-900 text-white text-xs px-3 py-2 rounded-lg shadow-lg border border-gray-700">
      <p className="text-gray-400 mb-1">{label}</p>
      <p className="font-bold">{fmtMoney(payload[0].value)}</p>
    </div>
  )
}

// ─── BUY/SELL Marker Shape ────────────────
function BuyMarker(props: { cx?: number; cy?: number }) {
  const { cx = 0, cy = 0 } = props
  return (
    <g>
      {/* Green upward triangle */}
      <polygon
        points={`${cx},${cy - 12} ${cx - 8},${cy + 4} ${cx + 8},${cy + 4}`}
        fill="#22c55e"
        stroke="#fff"
        strokeWidth={1.5}
      />
      <text x={cx} y={cy - 16} textAnchor="middle" fill="#22c55e" fontSize={9} fontWeight="bold">
        AL
      </text>
    </g>
  )
}

function SellMarker(props: { cx?: number; cy?: number }) {
  const { cx = 0, cy = 0 } = props
  return (
    <g>
      {/* Red downward triangle */}
      <polygon
        points={`${cx},${cy + 12} ${cx - 8},${cy - 4} ${cx + 8},${cy - 4}`}
        fill="#ef4444"
        stroke="#fff"
        strokeWidth={1.5}
      />
      <text x={cx} y={cy + 24} textAnchor="middle" fill="#ef4444" fontSize={9} fontWeight="bold">
        SAT
      </text>
    </g>
  )
}

// ─── Main Component ───────────────────────
export default function PositionChart({
  symbol,
  entryPrice,
  entryDate,
  quantity,
  exitPrice,
  exitDate,
  exitReason,
  priceRefreshMs = 10_000,
  chartRefreshMs = 60_000,
}: PositionChartProps) {
  const [priceData, setPriceData] = useState<PricePoint[]>([])
  const [currentPrice, setCurrentPrice] = useState<number | null>(null)
  const [prevPrice, setPrevPrice] = useState<number | null>(null)
  const [loading, setLoading] = useState(true)
  const [lastUpdate, setLastUpdate] = useState<string>('')
  const [expanded, setExpanded] = useState(true)
  const mountedRef = useRef(true)

  const isClosed = !!exitDate

  // ─── Fetch full chart data ─────────────
  const fetchChart = useCallback(async () => {
    try {
      const res = await fetch(`/api/stocks/${symbol}/prices?days=30&interval=1d`, {
        credentials: 'include',
      })
      const json = await res.json()
      if (!mountedRef.current) return
      if (json.ok && json.data?.length > 0) {
        setPriceData(json.data)
        const last = json.data[json.data.length - 1]
        if (last) {
          setPrevPrice(currentPrice)
          setCurrentPrice(last.close)
        }
      }
    } catch {
      // silently fail, will retry
    } finally {
      if (mountedRef.current) setLoading(false)
    }
  }, [symbol]) // eslint-disable-line react-hooks/exhaustive-deps

  // ─── Fetch latest price (lightweight) ──
  const fetchPrice = useCallback(async () => {
    try {
      const res = await fetch(`/api/stocks/${symbol}/prices?days=1&interval=1d`, {
        credentials: 'include',
      })
      const json = await res.json()
      if (!mountedRef.current) return
      if (json.ok && json.data?.length > 0) {
        const last = json.data[json.data.length - 1]
        setPrevPrice(currentPrice)
        setCurrentPrice(last.close)
        setLastUpdate(new Date().toLocaleTimeString('tr-TR'))
      }
    } catch {
      // silently fail
    }
  }, [symbol]) // eslint-disable-line react-hooks/exhaustive-deps

  // ─── Initial load + chart refresh ──────
  useEffect(() => {
    mountedRef.current = true
    fetchChart()
    if (chartRefreshMs > 0) {
      const interval = setInterval(fetchChart, chartRefreshMs)
      return () => {
        mountedRef.current = false
        clearInterval(interval)
      }
    }
    return () => { mountedRef.current = false }
  }, [fetchChart, chartRefreshMs])

  // ─── Price polling (only for open positions) ──
  useEffect(() => {
    if (isClosed || priceRefreshMs <= 0) return
    const interval = setInterval(fetchPrice, priceRefreshMs)
    return () => clearInterval(interval)
  }, [fetchPrice, priceRefreshMs, isClosed])

  // ─── Calculations ──────────────────────
  const displayPrice = isClosed ? (exitPrice ?? entryPrice) : (currentPrice ?? entryPrice)
  const pnl = (displayPrice - entryPrice) * quantity
  const pnlPct = ((displayPrice - entryPrice) / entryPrice) * 100
  const totalValue = displayPrice * quantity
  const priceDirection = prevPrice !== null && currentPrice !== null
    ? currentPrice > prevPrice ? 'up' : currentPrice < prevPrice ? 'down' : 'same'
    : 'same'

  // ─── Find marker positions in data ─────
  const entryDateShort = entryDate.slice(0, 10)
  const exitDateShort = exitDate?.slice(0, 10)
  const entryPointIdx = priceData.findIndex(d => d.date >= entryDateShort)
  const exitPointIdx = exitDateShort ? priceData.findIndex(d => d.date >= exitDateShort) : -1

  // ─── Stop loss / take profit lines ─────
  const stopLoss = entryPrice * 0.95
  const takeProfit = entryPrice * 1.10

  if (loading) {
    return (
      <div className="bg-white border border-gray-200 rounded-xl p-4 animate-pulse">
        <div className="flex items-center gap-3">
          <div className="h-6 w-20 bg-gray-200 rounded" />
          <div className="h-4 w-32 bg-gray-100 rounded" />
        </div>
        <div className="h-48 bg-gray-50 rounded mt-3" />
      </div>
    )
  }

  return (
    <div className="bg-white border border-gray-200 rounded-xl overflow-hidden shadow-sm">
      {/* ─── Header ─────────────────────── */}
      <div
        className="px-4 py-3 flex items-center justify-between cursor-pointer hover:bg-gray-50 transition-colors"
        onClick={() => setExpanded(!expanded)}
      >
        <div className="flex items-center gap-3">
          <h4 className="font-bold text-lg text-gray-900">{symbol}</h4>
          <span className={`text-xs px-2 py-0.5 rounded-full font-medium ${
            isClosed
              ? 'bg-gray-100 text-gray-600'
              : 'bg-green-50 text-green-700 border border-green-200'
          }`}>
            {isClosed ? `Kapalı — ${exitReason || ''}` : 'Açık Pozisyon'}
          </span>
          {!isClosed && lastUpdate && (
            <span className="text-xs text-gray-400 flex items-center gap-1">
              <Eye className="w-3 h-3" />
              {lastUpdate}
            </span>
          )}
        </div>

        <div className="flex items-center gap-4">
          {/* Current Price with animation */}
          <div className="text-right">
            <div className={`text-xl font-bold tabular-nums transition-colors duration-300 ${
              priceDirection === 'up' ? 'text-green-600' :
              priceDirection === 'down' ? 'text-red-600' :
              'text-gray-900'
            }`}>
              {displayPrice.toFixed(2)} ₺
              {priceDirection === 'up' && <TrendingUp className="w-4 h-4 inline ml-1" />}
              {priceDirection === 'down' && <TrendingDown className="w-4 h-4 inline ml-1" />}
            </div>
            <div className={`text-sm font-medium ${pnl >= 0 ? 'text-green-600' : 'text-red-600'}`}>
              {pnl >= 0 ? '+' : ''}{fmtMoney(pnl)} ({pnlPct >= 0 ? '+' : ''}{pnlPct.toFixed(2)}%)
            </div>
          </div>
        </div>
      </div>

      {/* ─── Expanded Content ───────────── */}
      {expanded && (
        <div className="border-t border-gray-100">
          {/* Stats Row */}
          <div className="grid grid-cols-2 md:grid-cols-5 gap-3 px-4 py-3 bg-gray-50/50 text-sm">
            <div>
              <span className="text-gray-500">Adet</span>
              <p className="font-semibold text-gray-900">{quantity.toLocaleString('tr-TR')} lot</p>
            </div>
            <div>
              <span className="text-gray-500">Giriş Fiyatı</span>
              <p className="font-semibold text-gray-900">{entryPrice.toFixed(2)} ₺</p>
            </div>
            <div>
              <span className="text-gray-500">Toplam Değer</span>
              <p className="font-semibold text-gray-900">{fmtMoney(totalValue)}</p>
            </div>
            <div>
              <span className="text-gray-500">Stop Loss</span>
              <p className="font-semibold text-red-600">{stopLoss.toFixed(2)} ₺</p>
            </div>
            <div>
              <span className="text-gray-500">Take Profit</span>
              <p className="font-semibold text-green-600">{takeProfit.toFixed(2)} ₺</p>
            </div>
          </div>

          {/* Chart */}
          {priceData.length > 0 ? (
            <div className="px-4 py-3">
              <ResponsiveContainer width="100%" height={240}>
                <AreaChart data={priceData} margin={{ top: 20, right: 10, left: 0, bottom: 5 }}>
                  <defs>
                    <linearGradient id={`gradient-${symbol}`} x1="0" y1="0" x2="0" y2="1">
                      <stop offset="0%" stopColor={pnl >= 0 ? '#22c55e' : '#ef4444'} stopOpacity={0.3} />
                      <stop offset="100%" stopColor={pnl >= 0 ? '#22c55e' : '#ef4444'} stopOpacity={0.02} />
                    </linearGradient>
                  </defs>
                  <CartesianGrid strokeDasharray="3 3" stroke="#f0f0f0" />
                  <XAxis
                    dataKey="date"
                    tick={{ fontSize: 10, fill: '#9ca3af' }}
                    tickFormatter={(v: string) => v.slice(5)}
                    interval="preserveStartEnd"
                  />
                  <YAxis
                    domain={['auto', 'auto']}
                    tick={{ fontSize: 10, fill: '#9ca3af' }}
                    tickFormatter={(v: number) => v.toFixed(1)}
                    width={55}
                  />
                  <Tooltip content={<ChartTooltip />} />

                  {/* Price area */}
                  <Area
                    type="monotone"
                    dataKey="close"
                    stroke={pnl >= 0 ? '#22c55e' : '#ef4444'}
                    strokeWidth={2}
                    fill={`url(#gradient-${symbol})`}
                    dot={false}
                    animationDuration={500}
                  />

                  {/* Entry price reference line */}
                  <ReferenceLine
                    y={entryPrice}
                    stroke="#f59e0b"
                    strokeDasharray="6 4"
                    strokeWidth={1.5}
                    label={{
                      value: `Giriş: ${entryPrice.toFixed(2)}`,
                      position: 'right',
                      fill: '#f59e0b',
                      fontSize: 10,
                    }}
                  />

                  {/* Stop loss line */}
                  {!isClosed && (
                    <ReferenceLine
                      y={stopLoss}
                      stroke="#ef4444"
                      strokeDasharray="4 4"
                      strokeWidth={1}
                      strokeOpacity={0.5}
                    />
                  )}

                  {/* Take profit line */}
                  {!isClosed && (
                    <ReferenceLine
                      y={takeProfit}
                      stroke="#22c55e"
                      strokeDasharray="4 4"
                      strokeWidth={1}
                      strokeOpacity={0.5}
                    />
                  )}

                  {/* BUY marker */}
                  {entryPointIdx >= 0 && (
                    <ReferenceDot
                      x={priceData[entryPointIdx].date}
                      y={priceData[entryPointIdx].close}
                      r={0}
                      shape={<BuyMarker />}
                    />
                  )}

                  {/* SELL marker */}
                  {exitPointIdx >= 0 && exitPrice && (
                    <ReferenceDot
                      x={priceData[exitPointIdx].date}
                      y={priceData[exitPointIdx].close}
                      r={0}
                      shape={<SellMarker />}
                    />
                  )}
                </AreaChart>
              </ResponsiveContainer>
            </div>
          ) : (
            <div className="px-4 py-8 text-center text-gray-400 text-sm">
              Fiyat verisi bulunamadı
            </div>
          )}
        </div>
      )}
    </div>
  )
}