'use client'

import { useState, useMemo } from 'react'
import { useLocale } from 'next-intl'
import type { BotTrade, TrumpPost } from '@/types'
import Pagination from '@/components/ui/Pagination'

// ── Formatters ────────────────────────────────────────────────────────────────
function fmtMoney(n: number, opts: { sign?: boolean; decimals?: number } = {}) {
  const { decimals = 2, sign = false } = opts
  if (n == null || isNaN(n)) return '—'
  const abs = Math.abs(n)
  const s = abs.toLocaleString('en-US', { minimumFractionDigits: decimals, maximumFractionDigits: decimals })
  if (n < 0) return '-$' + s
  if (sign && n > 0) return '+$' + s
  return '$' + s
}
function fmtPct(n: number) { return (n >= 0 ? '+' : '') + n.toFixed(2) + '%' }
function fmtHold(s: number) {
  if (s < 60) return s + 's'
  const m = Math.floor(s / 60)
  if (m < 60) return m + 'm'
  return Math.floor(m / 60) + 'h ' + (m % 60) + 'm'
}

interface Props {
  trades:  BotTrade[]
  posts:   TrumpPost[]
  loading: boolean
}

// ASSETS filter is derived dynamically from the trade set (see useMemo below)
// so new assets (TRUMP, BNB, DOGE, LINK, AAVE, ...) appear automatically.
const SIDES = ['all', 'long', 'short'] as const

const TRADES_PER_PAGE = 25

export default function TradeTable({ trades, posts, loading }: Props) {
  const locale = useLocale()
  const isZh = false  // i18n shelved — Chinese branches kept as dead code for future revival; see messages/zh.json
  const [assetFilter,  setAssetFilter]  = useState('all')
  const [sideFilter,   setSideFilter]   = useState('all')
  const [sourceFilter, setSourceFilter] = useState('all')
  const [hidePaper,    setHidePaper]    = useState(false)
  const [page,         setPage]         = useState(1)

  // Distinct assets present in the loaded trade set — drives the asset filter.
  // Dynamic so new perps (TRUMP, BNB, DOGE, LINK, AAVE, ...) appear without
  // a code change; sorted alphabetically with BTC/ETH first for familiarity.
  const assets: string[] = useMemo(() => {
    const set = new Set<string>()
    for (const t of trades) if (t.asset) set.add(t.asset)
    const priority = ['BTC', 'ETH', 'SOL', 'TRUMP']
    const rest = Array.from(set).filter(a => !priority.includes(a)).sort()
    return ['all', ...priority.filter(a => set.has(a)), ...rest]
  }, [trades])

  // Distinct sources present in the loaded trade set — drives the filter UI.
  // Includes 'unknown' as a bucket for trades whose trigger post was deleted.
  const sources = useMemo(() => {
    const set = new Set<string>()
    for (const t of trades) set.add(t.trigger_source || 'unknown')
    return Array.from(set).sort()
  }, [trades])

  // Per-source PnL aggregate — the critical view for "which module makes money".
  // Computed BEFORE the asset/side filter so the source breakdown reflects the
  // full universe, not whatever sub-filter is currently applied.
  const perSource = useMemo(() => {
    const acc: Record<string, { trades: number; pnl: number; wins: number; paper: number }> = {}
    for (const t of trades) {
      const k = t.trigger_source || 'unknown'
      if (!acc[k]) acc[k] = { trades: 0, pnl: 0, wins: 0, paper: 0 }
      acc[k].trades += 1
      if (t.pnl_usd != null) {
        acc[k].pnl += t.pnl_usd
        if (t.pnl_usd > 0) acc[k].wins += 1
      }
      if (t.is_paper) acc[k].paper += 1
    }
    return acc
  }, [trades])

  const filtered = useMemo(() => trades.filter(t => {
    if (sourceFilter !== 'all' && (t.trigger_source || 'unknown') !== sourceFilter) return false
    if (assetFilter  !== 'all' && t.asset !== assetFilter) return false
    if (sideFilter   !== 'all' && t.side  !== sideFilter)  return false
    if (hidePaper    && t.is_paper) return false
    return true
  }), [trades, sourceFilter, assetFilter, sideFilter, hidePaper])

  const totalPages = Math.max(1, Math.ceil(filtered.length / TRADES_PER_PAGE))
  const safePage   = Math.min(page, totalPages)
  const pageRows   = filtered.slice((safePage - 1) * TRADES_PER_PAGE, safePage * TRADES_PER_PAGE)

  // Exclude externally-closed trades (pnl_usd null) from aggregates.
  const priced   = filtered.filter(t => t.pnl_usd !== null && t.pnl_usd !== undefined)
  const totalPnl = priced.reduce((s, t) => s + (t.pnl_usd ?? 0), 0)
  const wins     = priced.filter(t => (t.pnl_usd ?? 0) > 0).length
  const losses   = priced.length - wins
  const avgHold  = filtered.length > 0
    ? Math.round(filtered.reduce((s, t) => s + t.hold_seconds, 0) / filtered.length)
    : 0

  return (
    <>
      {/* ── Per-source breakdown (the "which module makes money" view) ── */}
      {sources.length > 1 && (
        <div className="card" style={{ padding: 16, marginBottom: 16 }}>
          <div style={{
            fontSize: 11, fontWeight: 600, letterSpacing: '0.06em',
            textTransform: 'uppercase', color: 'var(--ink-3)', marginBottom: 10,
          }}>
            {isZh ? '按信号来源拆分盈亏' : 'P&L by signal source'}
          </div>
          <div style={{
            display: 'grid',
            gridTemplateColumns: 'repeat(auto-fit, minmax(160px, 1fr))',
            gap: 10,
          }}>
            {sources.map(src => {
              const s = perSource[src]
              const winRate = s.trades ? (s.wins / s.trades) * 100 : 0
              const tone = s.pnl > 0 ? 'up' : s.pnl < 0 ? 'down' : 'idle'
              const bg = tone === 'up' ? 'var(--up-soft)'
                       : tone === 'down' ? 'var(--down-soft)'
                       : 'var(--bg-sunk)'
              const fg = tone === 'up' ? 'var(--up)'
                       : tone === 'down' ? 'var(--down)'
                       : 'var(--ink-2)'
              return (
                <button
                  key={src}
                  onClick={() => { setSourceFilter(sourceFilter === src ? 'all' : src); setPage(1) }}
                  style={{
                    textAlign: 'left', cursor: 'pointer',
                    background: bg, borderRadius: 8, padding: '12px 14px',
                    border: `1px solid ${sourceFilter === src ? fg : 'transparent'}`,
                  }}
                >
                  <div style={{
                    fontSize: 11, fontWeight: 600, color: 'var(--ink-2)',
                    marginBottom: 4, overflow: 'hidden', textOverflow: 'ellipsis',
                  }}>
                    {src}
                    {s.paper > 0 && (
                      <span style={{
                        fontSize: 9, marginLeft: 6, padding: '1px 5px',
                        borderRadius: 3, background: 'rgba(245,158,11,0.15)',
                        color: '#f59e0b',
                      }}>
                        {s.paper}P
                      </span>
                    )}
                  </div>
                  <div style={{ fontSize: 16, fontWeight: 700, color: fg, fontVariantNumeric: 'tabular-nums' }}>
                    {fmtMoney(s.pnl, { sign: true, decimals: 0 })}
                  </div>
                  <div style={{ fontSize: 10, color: 'var(--ink-3)', marginTop: 2 }}>
                    {isZh ? `${s.trades} 笔交易 · ${winRate.toFixed(0)}% 胜率` : `${s.trades} trades · ${winRate.toFixed(0)}% win`}
                  </div>
                </button>
              )
            })}
          </div>
          <div style={{ fontSize: 10, color: 'var(--ink-4)', marginTop: 8 }}>
            {isZh ? '点击来源可筛选表格。' : 'Click a source to filter the table.'} {sourceFilter !== 'all' && (
              <button
                onClick={() => { setSourceFilter('all'); setPage(1) }}
                style={{ marginLeft: 8, padding: '2px 8px', fontSize: 10,
                         border: '1px solid var(--line)', borderRadius: 4,
                         background: 'transparent', cursor: 'pointer', color: 'var(--ink-2)' }}
              >
                {isZh ? `清除（当前为 “${sourceFilter}”）` : `Clear (showing “${sourceFilter}”)`}
              </button>
            )}
          </div>
        </div>
      )}

      {/* KPI row */}
      <div className="kpi-row" style={{ gridTemplateColumns: 'repeat(4,1fr)', marginBottom: 20 }}>
        <div className="kpi">
          <div className="label">{isZh ? '总交易数' : 'Total trades'}</div>
          <div className="value">{filtered.length}</div>
        </div>
        <div className="kpi">
          <div className="label">{isZh ? '胜率' : 'Win rate'}</div>
          <div className="value">{priced.length ? ((wins / priced.length) * 100).toFixed(1) + '%' : '—'}</div>
          <div className="foot"><span>{isZh ? `${wins} 赢 · ${losses} 亏` : `${wins}W · ${losses}L`}</span></div>
        </div>
        <div className="kpi accent">
          <div className="label">{isZh ? '净盈亏' : 'Net P&L'}</div>
          <div className="value">{fmtMoney(totalPnl, { sign: true, decimals: 0 })}</div>
        </div>
        <div className="kpi">
          <div className="label">{isZh ? '平均持仓' : 'Avg hold'}</div>
          <div className="value">{avgHold ? fmtHold(avgHold) : '—'}</div>
        </div>
      </div>

      {/* Filters */}
      <div style={{ display: 'flex', gap: 10, flexWrap: 'wrap', alignItems: 'center', marginBottom: 14 }}>
        <div className="nav-tabs">
          {assets.map(a => (
            <button
              key={a}
              className={`nav-tab ${assetFilter === a ? 'active' : ''}`}
              onClick={() => { setAssetFilter(a); setPage(1) }}
            >
              {a === 'all' ? (isZh ? '全部资产' : 'All assets') : a}
            </button>
          ))}
        </div>
        <div className="nav-tabs">
          {SIDES.map(s => (
            <button
              key={s}
              className={`nav-tab ${sideFilter === s ? 'active' : ''}`}
              onClick={() => { setSideFilter(s); setPage(1) }}
            >
              {s === 'all' ? (isZh ? '全部方向' : 'All') : s === 'long' ? (isZh ? '做多' : 'Long') : (isZh ? '做空' : 'Short')}
            </button>
          ))}
        </div>
        {/* Hide-paper toggle: paper trades inflate volume but aren't real $ — */}
        {/* let users blend them out before reading the KPI row. */}
        <label style={{
          display: 'flex', alignItems: 'center', gap: 6, fontSize: 12,
          color: 'var(--ink-3)', cursor: 'pointer', marginLeft: 'auto',
        }}>
          <input
            type="checkbox"
            checked={hidePaper}
            onChange={e => { setHidePaper(e.target.checked); setPage(1) }}
          />
          {isZh ? '隐藏模拟交易' : 'Hide paper trades'}
        </label>
      </div>

      {/* Loading state */}
      {loading && (
        <div style={{ textAlign: 'center', padding: 60, color: 'var(--ink-3)' }}>{isZh ? '加载中…' : 'Loading…'}</div>
      )}

      {/* Table */}
      {!loading && (
        <div className="card flush" style={{ overflow: 'hidden' }}>
          <table className="table">
            <thead>
              <tr>
                <th>{isZh ? '来源' : 'Source'}</th>
                <th>{isZh ? '资产' : 'Asset'}</th>
                <th>{isZh ? '方向' : 'Side'}</th>
                <th>{isZh ? '开仓' : 'Entry'}</th>
                <th>{isZh ? '平仓' : 'Exit'}</th>
                <th>{isZh ? '持仓' : 'Hold'}</th>
                <th>{isZh ? '触发内容' : 'Trigger'}</th>
                <th>P&amp;L</th>
              </tr>
            </thead>
            <tbody>
              {filtered.length === 0 && (
                <tr>
                  <td colSpan={8} style={{ textAlign: 'center', padding: 40, color: 'var(--ink-3)' }}>
                    {isZh ? '没有符合条件的交易。' : 'No trades found'}
                  </td>
                </tr>
              )}
              {pageRows.map(t => {
                const tp = posts.find(p => p.id === t.trigger_post_id)
                const roi =
                  t.entry_price && t.exit_price != null
                    ? ((t.exit_price - t.entry_price) / t.entry_price) * 100 * (t.side === 'long' ? 1 : -1)
                    : 0
                const src = t.trigger_source || 'unknown'
                return (
                  <tr key={t.id}>
                    <td>
                      <div style={{ display: 'flex', alignItems: 'center', gap: 6 }}>
                        <span style={{
                          fontSize: 11, fontWeight: 600, color: 'var(--ink-2)',
                          padding: '2px 7px', borderRadius: 4,
                          background: 'var(--bg-sunk)',
                        }}>
                          {src}
                        </span>
                        {t.is_paper && (
                          <span style={{
                            fontSize: 9, padding: '1px 5px', borderRadius: 3,
                            background: 'rgba(245,158,11,0.15)', color: '#f59e0b',
                          }}>
                            PAPER
                          </span>
                        )}
                      </div>
                    </td>
                    <td>
                      <div className="row gap-s">
                        <span className={`asset-dot ${t.asset.toLowerCase()}`} />
                        <span style={{ fontWeight: 500 }}>{t.asset}</span>
                      </div>
                    </td>
                    <td>
                      <span className={`side-pill ${t.side}`}>
                        {t.side === 'long' ? (isZh ? '↗ 做多' : '↗ LONG') : (isZh ? '↘ 做空' : '↘ SHORT')}
                      </span>
                    </td>
                    <td className="mono">{t.entry_price ? '$' + t.entry_price.toLocaleString() : '—'}</td>
                    <td className="mono">{t.exit_price != null ? '$' + t.exit_price.toLocaleString() : '—'}</td>
                    <td className="mono" style={{ color: 'var(--ink-2)' }}>{fmtHold(t.hold_seconds)}</td>
                    <td style={{ maxWidth: 260 }}>
                      {tp ? (
                        <span style={{ fontSize: 12, color: 'var(--ink-2)', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', display: 'block' }}>
                          {tp.text.slice(0, 60)}…
                        </span>
                      ) : (
                        <span style={{ fontSize: 12, color: 'var(--ink-4)' }}>—</span>
                      )}
                    </td>
                    <td>
                      <div className="stack" style={{ alignItems: 'flex-end' }}>
                        {t.pnl_usd === null || t.pnl_usd === undefined ? (
                          <span
                            style={{ fontSize: 12, color: 'var(--ink-4)' }}
                            title={isZh ? '在 Hyperliquid 外部平仓，PnL 未记录' : 'Closed externally on Hyperliquid — PnL not recorded'}
                          >
                            n/a
                          </span>
                        ) : (
                          <>
                            <span className={`delta ${t.pnl_usd >= 0 ? 'up' : 'down'}`} style={{ fontWeight: 600, fontSize: 14 }}>
                              {fmtMoney(t.pnl_usd, { sign: true })}
                            </span>
                            <span className={`delta ${roi >= 0 ? 'up' : 'down'}`} style={{ fontSize: 11, opacity: 0.7 }}>
                              {fmtPct(roi)}
                            </span>
                          </>
                        )}
                      </div>
                    </td>
                  </tr>
                )
              })}
            </tbody>
          </table>
        </div>
      )}

      {/* Pagination */}
      {!loading && (
        <Pagination
          page={safePage}
          total={totalPages}
          count={filtered.length}
          pageSize={TRADES_PER_PAGE}
          onChange={setPage}
          scrollTop={false}
        />
      )}
    </>
  )
}