'use client'
import { useState } from 'react'
import { DndContext, closestCenter, type DragEndEvent } from '@dnd-kit/core'
import { SortableContext, verticalListSortingStrategy } from '@dnd-kit/sortable'
import KeywordRow from './KeywordRow'
import { useKeywords, useAddKeyword, useReorderKeywords } from '@/hooks/useKeywords'

export default function KeywordsTable() {
  const { data: keywords, isLoading } = useKeywords()
  const addKw   = useAddKeyword()
  const reorder = useReorderKeywords()
  const [newTerm,   setNewTerm]   = useState('')
  const [newWeight, setNewWeight] = useState('1')
  const [batchText, setBatchText] = useState('')
  const [showBatch, setShowBatch] = useState(false)

  const handleDragEnd = ({ active, over }: DragEndEvent) => {
    if (!over || active.id === over.id || !keywords) return
    const ids = keywords.map((k) => k.id)
    const from = ids.indexOf(Number(active.id))
    const to   = ids.indexOf(Number(over.id))
    const newOrder = [...ids]
    newOrder.splice(to, 0, newOrder.splice(from, 1)[0])
    reorder.mutate(newOrder)
  }

  const handleBatchImport = () => {
    const lines = batchText.split('\n').map((l) => l.trim()).filter(Boolean)
    lines.forEach((line) => {
      const [term, weight] = line.split(':')
      addKw.mutate({ term: term.trim(), weight: parseFloat(weight || '1') })
    })
    setBatchText('')
    setShowBatch(false)
  }

  if (isLoading) return (
    <div className="g-card p-5 space-y-3">
      {Array.from({ length: 4 }).map((_, i) => (
        <div key={i} className="h-10 bg-g-raised rounded-lg animate-pulse" style={{ opacity: 1 - i * 0.2 }} />
      ))}
    </div>
  )

  return (
    <div className="space-y-4">
      {/* Add new */}
      <div className="g-card p-4">
        <p className="text-xs text-g-faint mb-3 leading-relaxed">
          Each target is a search label sent to auction sites.
          Set an <span className="text-g-green">AI Description</span> on each target to filter lot titles semantically.
        </p>
        <div className="flex gap-2 flex-wrap">
          <input
            value={newTerm}
            onChange={(e) => setNewTerm(e.target.value)}
            onKeyDown={(e) => e.key === 'Enter' && newTerm.trim() && (addKw.mutate({ term: newTerm, weight: parseFloat(newWeight) }), setNewTerm(''), setNewWeight('1'))}
            placeholder="Search term…"
            className="g-input h-9 flex-1 min-w-44 text-sm"
          />
          <input
            value={newWeight}
            onChange={(e) => setNewWeight(e.target.value)}
            type="number" step="0.1"
            placeholder="Weight"
            className="g-input h-9 w-24 text-sm font-mono"
          />
          <button
            onClick={() => {
              if (newTerm.trim()) {
                addKw.mutate({ term: newTerm, weight: parseFloat(newWeight) })
                setNewTerm('')
                setNewWeight('1')
              }
            }}
            className="g-btn-primary h-9 text-sm px-4"
          >
            + Add
          </button>
          <button
            onClick={() => setShowBatch(!showBatch)}
            className="g-btn h-9 text-sm"
          >
            Batch
          </button>
        </div>

        {showBatch && (
          <div className="mt-3 space-y-2 pt-3 border-t border-g-border/40">
            <p className="text-xs text-g-faint">One target per line. Format: <code className="text-g-muted">laptop:2</code></p>
            <textarea
              value={batchText}
              onChange={(e) => setBatchText(e.target.value)}
              placeholder={"laptop:2\nRTX 4090:3\niPhone 15"}
              rows={4}
              className="g-input text-sm font-mono resize-none"
            />
            <button onClick={handleBatchImport} className="g-btn-primary text-sm">Import all</button>
          </div>
        )}
      </div>

      {/* Table */}
      <div className="g-card overflow-hidden">
        <DndContext collisionDetection={closestCenter} onDragEnd={handleDragEnd}>
          <SortableContext items={(keywords ?? []).map((k) => k.id)} strategy={verticalListSortingStrategy}>
            <div className="overflow-x-auto">
              <table className="g-table">
                <thead>
                  <tr>
                    <th className="w-8"></th>
                    <th>Target label</th>
                    <th className="text-center">Weight</th>
                    <th>AI description</th>
                    <th>Price filter</th>
                    <th className="w-10"></th>
                  </tr>
                </thead>
                <tbody>
                  {(keywords ?? []).map((kw) => <KeywordRow key={kw.id} keyword={kw} />)}
                </tbody>
              </table>
              {!(keywords ?? []).length && (
                <div className="flex flex-col items-center justify-center py-12 text-g-faint gap-2">
                  <span className="text-3xl opacity-20">⌖</span>
                  <p className="text-sm">No targets yet — add one above</p>
                </div>
              )}
            </div>
          </SortableContext>
        </DndContext>
      </div>
    </div>
  )
}