'use client'

import { useEffect, useRef } from 'react'
import type { TrumpPost, Candle } from '@/types'
import { useDashboardStore } from '@/store/dashboard'
import Pill from '@/components/ui/Pill'
import PostCards, { MOCK_POSTS } from './PostCards'
import ExpandDetail from './ExpandDetail'

interface ChartPanelProps {
  posts?: TrumpPost[]
  candles?: Candle[]
}

export default function ChartPanel({ posts = MOCK_POSTS, candles = [] }: ChartPanelProps) {
  const { asset, timeframe, setAsset, setTimeframe, selectedPostId, setSelectedPost } = useDashboardStore()
  const containerRef = useRef<HTMLDivElement>(null)
  const chartRef = useRef<unknown>(null)
  const seriesRef = useRef<unknown>(null)
  const fittedRef = useRef(false)
  // Keep latest posts/selectedPostId accessible inside chart callbacks without re-subscribing
  const postsRef = useRef(posts)
  postsRef.current = posts
  const selectedPostIdRef = useRef(selectedPostId)
  selectedPostIdRef.current = selectedPostId

  const assets: Array<'BTC' | 'ETH'> = ['BTC', 'ETH']
  const timeframes: Array<'5m' | '15m' | '1H' | '4H' | '1D' | '1W'> = ['5m', '15m', '1H', '4H', '1D', '1W']

  const selectedPost = posts.find((p) => p.id === selectedPostId) ?? null

  // Create chart once on mount
  useEffect(() => {
    if (!containerRef.current || typeof window === 'undefined') return

    let destroyed = false

    import('lightweight-charts').then(({ createChart, CrosshairMode }) => {
      if (destroyed || !containerRef.current) return

      const chart = createChart(containerRef.current, {
        width: containerRef.current.clientWidth,
        height: 360,
        layout: {
          background: { color: '#050505' },
          textColor: '#555555',
        },
        grid: {
          vertLines: { color: '#111111' },
          horzLines: { color: '#111111' },
        },
        crosshair: { mode: CrosshairMode.Normal },
        rightPriceScale: { borderColor: '#1a1a1a' },
        timeScale: {
          borderColor: '#1a1a1a',
          timeVisible: true,
          rightOffset: 5,
          barSpacing: 10,
        },
        handleScroll: true,
        handleScale: true,
      })

      // @ts-expect-error lightweight-charts type
      chartRef.current = chart

      const series = chart.addCandlestickSeries({
        upColor: '#4ade80',
        downColor: '#ef4444',
        borderUpColor: '#4ade80',
        borderDownColor: '#ef4444',
        wickUpColor: '#4ade80',
        wickDownColor: '#ef4444',
      })

      // @ts-expect-error lightweight-charts type
      seriesRef.current = series

      // Click on chart: find nearest post marker within 2-bar tolerance
      chart.subscribeClick((param: { time?: number | string }) => {
        if (!param.time) return
        const clickTime = typeof param.time === 'number' ? param.time : 0
        if (!clickTime) return

        const allPosts = postsRef.current
        let closest: TrumpPost | null = null
        let closestDiff = Infinity

        for (const p of allPosts) {
          if (!p.published_at) continue
          const pt = Math.floor(new Date(p.published_at).getTime() / 1000)
          const diff = Math.abs(pt - clickTime)
          if (diff < closestDiff) {
            closestDiff = diff
            closest = p
          }
        }

        // Only select if click is within 2 hours of a post (7200 seconds)
        if (closest && closestDiff <= 7200) {
          const newId = closest.id === selectedPostIdRef.current ? null : closest.id
          setSelectedPost(newId)
        } else {
          setSelectedPost(null)
        }
      })

      const ro = new ResizeObserver(() => {
        if (containerRef.current && !destroyed) {
          chart.applyOptions({ width: containerRef.current.clientWidth })
        }
      })
      ro.observe(containerRef.current)

      return () => {
        ro.disconnect()
      }
    })

    return () => {
      destroyed = true
      fittedRef.current = false
      if (chartRef.current) {
        // @ts-expect-error lightweight-charts type
        chartRef.current.remove()
        chartRef.current = null
        seriesRef.current = null
      }
    }
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  // Update candles + markers whenever data changes
  useEffect(() => {
    const series = seriesRef.current
    const chart = chartRef.current
    if (!series || !chart || candles.length === 0) return

    const sorted = [...candles].sort((a, b) => a.time - b.time)

    // @ts-expect-error lightweight-charts type
    series.setData(sorted.map((c) => ({
      time: c.time as number,
      open: c.open,
      high: c.high,
      low: c.low,
      close: c.close,
    })))

    // Show markers for all posts within visible time range
    const minTime = sorted[0].time
    const maxTime = sorted[sorted.length - 1].time

    const visible = posts.filter((p) => {
      if (!p.published_at) return false
      const t = Math.floor(new Date(p.published_at).getTime() / 1000)
      return t >= minTime && t <= maxTime
    })

    if (visible.length > 0) {
      const markers = [...visible]
        .sort((a, b) => new Date(a.published_at).getTime() - new Date(b.published_at).getTime())
        .map((p) => ({
          time: Math.floor(new Date(p.published_at).getTime() / 1000) as number,
          position: 'aboveBar' as const,
          color: p.id === selectedPostId
            ? '#fb923c'
            : p.sentiment === 'bearish'
            ? '#ef4444'
            : '#f97316',
          shape: 'circle' as const,
          text: '',
          size: p.id === selectedPostId ? 2 : 1,
        }))
      // @ts-expect-error lightweight-charts type
      series.setMarkers(markers)
    }

    if (!fittedRef.current) {
      // @ts-expect-error lightweight-charts type
      chart.timeScale().fitContent()
      fittedRef.current = true
    }
  }, [candles, posts, selectedPostId])

  // Reset fit flag on timeframe/asset switch
  useEffect(() => {
    fittedRef.current = false
  }, [asset, timeframe])

  return (
    <div className="flex-1 min-w-0 bg-[#0a0a0a] border border-[#141414] rounded-[10px] p-4 flex flex-col gap-3">
      {/* Controls */}
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-2">
          {assets.map((a) => (
            <Pill key={a} active={asset === a} onClick={() => setAsset(a)}>
              {a}
            </Pill>
          ))}
        </div>
        <div className="flex items-center gap-2">
          {timeframes.map((tf) => (
            <Pill key={tf} active={timeframe === tf} onClick={() => setTimeframe(tf as '4H' | '1D' | '1W')}>
              {tf}
            </Pill>
          ))}
        </div>
      </div>

      {/* Chart */}
      <div
        ref={containerRef}
        className="w-full rounded-lg overflow-hidden cursor-crosshair"
        style={{ height: 360, background: '#050505' }}
      />

      {/* Selected post detail — shown immediately below chart */}
      <ExpandDetail post={selectedPost} />

      {/* Post cards list */}
      <PostCards posts={posts} />
    </div>
  )
}