'use client'

import { useState, useEffect, useRef } from 'react'

interface Trade {
  id: string
  date: string
  pair: string
  direction: 'long' | 'short'
  entry: number
  stopLoss: number
  takeProfit: number
  result?: 'win' | 'loss' | 'open'
  pnl?: number
  rr?: number
}

interface ChartData {
  time: number
  open: number
  high: number
  low: number
  close: number
  volume?: number
}

interface ThothView {
  thought: string
  trend: string
  phase: string
  key_level: number
  bias: string
  confidence: number
  reason: string
  next_action: string
  updated_at: string
  bias_history?: { time: number; bias: string; price: number }[]
  support_zones?: { level: number; strength: number }[]
  resistance_zones?: { level: number; strength: number }[]
}

const getCandleLimit = (tf: string) => ({ '15m': 80, '1h': 100, '4h': 60, '1D': 90 }[tf] || 100)

export default function TradingChart() {
  const chartContainerRef = useRef<HTMLDivElement>(null)
  const chartRef = useRef<any>(null)
  const seriesRef = useRef<any>(null)

  const [selectedAsset, setSelectedAsset] = useState<'BTC' | 'SOL' | 'ETH'>('BTC')
  const [selectedTimeframe, setSelectedTimeframe] = useState<'15m' | '1h' | '4h' | '1D'>('1h')
  const [chartData, setChartData] = useState<ChartData[]>([])
  const [priceData, setPriceData] = useState<{ price: number; change24h: number }>({ price: 0, change24h: 0 })
  const [loading, setLoading] = useState(true)
  const [trades, setTrades] = useState<Trade[]>([])
  const [thothView, setThothView] = useState<Record<string, ThothView>>({})
  const [mounted, setMounted] = useState(false)

  // Load chart library from CDN on mount
  useEffect(() => {
    setMounted(true)
    
    // Load lightweight-charts from CDN
    const script = document.createElement('script')
    script.src = 'https://unpkg.com/lightweight-charts@4.1.0/dist/lightweight-charts.standalone.production.js'
    script.onload = initChart
    script.onerror = () => console.error('Failed to load chart library')
    document.head.appendChild(script)

    return () => {
      if (chartRef.current) {
        chartRef.current.remove()
      }
    }
  }, [])

  const initChart = () => {
    if (!chartContainerRef.current || !(window as any).LightweightCharts) return

    const chart = (window as any).LightweightCharts.createChart(chartContainerRef.current, {
      layout: {
        background: { color: '#0a0a0f' },
        textColor: '#a0a0a0',
      },
      grid: {
        vertLines: { color: '#1a1a2e' },
        horzLines: { color: '#1a1a2e' },
      },
      width: chartContainerRef.current.clientWidth,
      height: 400,
      timeScale: {
        timeVisible: true,
        secondsVisible: false,
      },
      rightPriceScale: {
        borderColor: '#2a2a4e',
      },
    })

    const candlestickSeries = chart.addCandlestickSeries({
      upColor: '#22c55e',
      downColor: '#ef4444',
      borderUpColor: '#22c55e',
      borderDownColor: '#ef4444',
      wickUpColor: '#22c55e',
      wickDownColor: '#ef4444',
    })

    chartRef.current = chart
    seriesRef.current = candlestickSeries

    // Handle resize
    const handleResize = () => {
      if (chartContainerRef.current && chartRef.current) {
        chartRef.current.applyOptions({ width: chartContainerRef.current.clientWidth })
      }
    }
    window.addEventListener('resize', handleResize)

    // Fetch data
    fetchChartData()
    fetchPriceData()
    fetchTrades()
    fetchThothView()
  }

  const fetchPriceData = async () => {
    try {
      const idMap: Record<string, string> = { 'BTC': 'bitcoin', 'SOL': 'solana', 'ETH': 'ethereum' }
      const res = await fetch(`https://api.coingecko.com/api/v3/simple/price?ids=${idMap[selectedAsset]}&vs_currencies=usd&include_24hr_change=true`)
      const data = await res.json()
      setPriceData({ 
        price: data[idMap[selectedAsset]]?.usd || 0, 
        change24h: data[idMap[selectedAsset]]?.usd_24h_change || 0 
      })
    } catch (e) {
      const fallback: Record<string, { price: number; change24h: number }> = { 
        'BTC': { price: 105000, change24h: 2.5 }, 
        'SOL': { price: 180, change24h: -1.2 }, 
        'ETH': { price: 3200, change24h: 1.8 } 
      }
      setPriceData(fallback[selectedAsset] || { price: 0, change24h: 0 })
    }
  }

  const fetchChartData = async () => {
    setLoading(true)
    try {
      const symbol = selectedAsset === 'BTC' ? 'BTCUSDT' : selectedAsset === 'SOL' ? 'SOLUSDT' : 'ETHUSDT'
      const interval = { '15m': '15m', '1h': '1h', '4h': '4h', '1D': '1d' }[selectedTimeframe] || '1h'
      const res = await fetch(`https://api.binance.com/api/v3/klines?symbol=${symbol}&interval=${interval}&limit=${getCandleLimit(selectedTimeframe)}`)
      const data = await res.json()
      const formattedData = data.map((k: any[]) => ({
        time: k[0] / 1000,
        open: parseFloat(k[1]),
        high: parseFloat(k[2]),
        low: parseFloat(k[3]),
        close: parseFloat(k[4]),
        volume: parseFloat(k[5])
      }))
      setChartData(formattedData)
      
      // Update chart
      if (seriesRef.current) {
        seriesRef.current.setData(formattedData)
      }
      if (chartRef.current) {
        chartRef.current.timeScale().fitContent()
      }
    } catch (e) {
      console.error('Chart fetch error:', e)
    }
    setLoading(false)
  }

  const fetchTrades = async () => { 
    try { 
      const res = await fetch('/api/trading/trades'); 
      if (res.ok) setTrades((await res.json()).trades || []) 
    } catch (e) { console.warn(e) } 
  }

  const fetchThothView = async () => { 
    try { 
      const res = await fetch('/thoth_view.json'); 
      if (res.ok) setThothView(await res.json()) 
    } catch (e) { console.warn(e) } 
  }

  useEffect(() => {
    if (mounted && chartRef.current) {
      fetchChartData()
      fetchPriceData()
    }
  }, [selectedAsset, selectedTimeframe, mounted])

  const closedTrades = trades.filter((t) => t.result === 'win' || t.result === 'loss')
  const wins = closedTrades.filter((t) => t.result === 'win').length
  const winRate = closedTrades.length ? Math.round(wins / closedTrades.length * 100) : 0
  const totalPnl = closedTrades.reduce((s, t) => s + (t.pnl || 0), 0)
  const avgRr = closedTrades.length ? closedTrades.reduce((s, t) => s + (t.rr || 0), 0) / closedTrades.length : 0

  const cv = thothView[selectedAsset]
  const getTE = (t: string) => t === 'uptrend' ? '🟢' : t === 'downtrend' ? '🔴' : '⚪️'
  const getBC = (b: string) => b === 'bullish' ? 'text-green-400' : b === 'bearish' ? 'text-red-400' : 'text-yellow-400'

  if (!mounted) {
    return (
      <div className="flex items-center justify-center h-96">
        <div className="text-white/50">Loading chart...</div>
      </div>
    )
  }

  return (
    <div className="space-y-4">
      <div className="flex gap-4 justify-between flex-wrap">
        <div className="flex gap-2">
          {(['BTC', 'SOL', 'ETH'] as const).map(a => (
            <button 
              key={a} 
              onClick={() => setSelectedAsset(a)} 
              className={`px-4 py-2 rounded-lg font-medium ${selectedAsset === a ? 'bg-brand-pink text-white' : 'bg-white/10 text-white/70'}`}
            >
              {a}
            </button>
          ))}
        </div>
        <div className="flex gap-2">
          {(['15m', '1h', '4h', '1D'] as const).map(tf => (
            <button 
              key={tf} 
              onClick={() => setSelectedTimeframe(tf)} 
              className={`px-3 py-1 rounded text-sm ${selectedTimeframe === tf ? 'bg-green-500/20 text-green-400 border border-green-500/30' : 'bg-white/10 text-white/50'}`}
            >
              {tf}
            </button>
          ))}
        </div>
      </div>

      <div className="flex justify-between p-4 rounded-lg bg-black/50 border border-white/10">
        <div>
          <span className="text-2xl font-bold">{selectedAsset}/USD</span>
        </div>
        <div className="text-right">
          <div className="text-2xl font-bold">${priceData.price.toLocaleString()}</div>
          <div className={`text-sm ${priceData.change24h >= 0 ? 'text-green-400' : 'text-red-400'}`}>
            {priceData.change24h >= 0 ? '↑' : '↓'} {Math.abs(priceData.change24h).toFixed(2)}%
          </div>
        </div>
      </div>

      {cv && (
        <div className="rounded-lg border border-brand-pink/30 bg-brand-pink/5 p-4">
          <div className="flex items-center gap-2 mb-3">
            <span className="text-xl">👁️</span>
            <h3 className="font-bold text-brand-pink">THOTH'S VIEW</h3>
            <span className="text-xs text-white/40 ml-auto">{new Date(cv.updated_at).toLocaleString()}</span>
          </div>
          <p className="text-white/90 mb-4 italic">"{cv.thought}"</p>
          <div className="grid grid-cols-2 md:grid-cols-4 gap-3 text-sm">
            <div><p className="text-white/50 text-xs">Trend</p><p className="font-medium">{getTE(cv.trend)} {cv.trend}</p></div>
            <div><p className="text-white/50 text-xs">Phase</p><p className="font-medium">{cv.phase}</p></div>
            <div><p className="text-white/50 text-xs">Key Level</p><p className="font-medium">${cv.key_level.toLocaleString()}</p></div>
            <div><p className="text-white/50 text-xs">Bias</p><p className={`font-medium ${getBC(cv.bias)}`}>{cv.bias.toUpperCase()} ({cv.confidence}/10)</p></div>
          </div>
        </div>
      )}

      <div className="relative rounded-lg bg-black/50 border border-white/10" style={{ height: '420px' }}>
        {loading && (
          <div className="absolute inset-0 flex items-center justify-center bg-black/50 z-10">
            <span className="text-white/50">Loading...</span>
          </div>
        )}
        <div ref={chartContainerRef} className="w-full h-full" />
      </div>

      <div className="grid grid-cols-4 gap-4">
        <div className="p-4 rounded-lg bg-white/5">
          <p className="text-white/50 text-xs">Trades</p>
          <p className="text-xl font-bold">{closedTrades.length}</p>
        </div>
        <div className="p-4 rounded-lg bg-white/5">
          <p className="text-white/50 text-xs">Win Rate</p>
          <p className="text-xl font-bold">{winRate}%</p>
        </div>
        <div className="p-4 rounded-lg bg-white/5">
          <p className="text-white/50 text-xs">Total PnL</p>
          <p className={`text-xl font-bold ${totalPnl >= 0 ? 'text-green-400' : 'text-red-400'}`}>${totalPnl.toFixed(2)}</p>
        </div>
        <div className="p-4 rounded-lg bg-white/5">
          <p className="text-white/50 text-xs">Avg R:R</p>
          <p className="text-xl font-bold">{avgRr.toFixed(2)}R</p>
        </div>
      </div>
    </div>
  )
}