'use client'

/**
 * SpreadsheetTab — Fortune Sheet editor for vocabulary data.
 *
 * Converts VocabularyEntry[] into a Fortune Sheet workbook
 * where users can edit vocabulary in a familiar Excel-like UI.
 */

import React, { useMemo, useCallback } from 'react'
import dynamic from 'next/dynamic'
import type { VocabWorksheetHook } from '../types'

const Workbook = dynamic(
  () => import('@fortune-sheet/react').then((m) => m.Workbook),
  { ssr: false, loading: () => <div className="py-8 text-center text-sm text-gray-400">Spreadsheet wird geladen...</div> },
)

import '@fortune-sheet/react/dist/index.css'

/** Convert VocabularyEntry[] to Fortune Sheet sheet data */
function vocabToSheet(vocabulary: VocabWorksheetHook['vocabulary']) {
  const headers = ['Englisch', 'Deutsch', 'Beispielsatz', 'Wortart', 'Seite']
  const numCols = headers.length
  const numRows = vocabulary.length + 1 // +1 for header

  const celldata: any[] = []

  // Header row
  headers.forEach((label, c) => {
    celldata.push({
      r: 0,
      c,
      v: { v: label, m: label, bl: 1, bg: '#f0f4ff', fc: '#1e293b' },
    })
  })

  // Data rows
  vocabulary.forEach((entry, idx) => {
    const r = idx + 1
    celldata.push({ r, c: 0, v: { v: entry.english, m: entry.english } })
    celldata.push({ r, c: 1, v: { v: entry.german, m: entry.german } })
    celldata.push({ r, c: 2, v: { v: entry.example_sentence || '', m: entry.example_sentence || '' } })
    celldata.push({ r, c: 3, v: { v: entry.word_type || '', m: entry.word_type || '' } })
    celldata.push({ r, c: 4, v: { v: entry.source_page != null ? String(entry.source_page) : '', m: entry.source_page != null ? String(entry.source_page) : '' } })
  })

  // Column widths
  const columnlen: Record<string, number> = {
    '0': 180, // Englisch
    '1': 180, // Deutsch
    '2': 280, // Beispielsatz
    '3': 100, // Wortart
    '4': 60,  // Seite
  }

  // Row heights
  const rowlen: Record<string, number> = {}
  rowlen['0'] = 28 // header

  // Borders: light grid
  const borderInfo = numRows > 0 && numCols > 0 ? [{
    rangeType: 'range',
    borderType: 'border-all',
    color: '#e5e7eb',
    style: 1,
    range: [{ row: [0, numRows - 1], column: [0, numCols - 1] }],
  }] : []

  return {
    name: 'Vokabeln',
    id: 'vocab_sheet',
    celldata,
    row: numRows,
    column: numCols,
    status: 1,
    config: {
      columnlen,
      rowlen,
      borderInfo,
    },
  }
}

export function SpreadsheetTab({ h }: { h: VocabWorksheetHook }) {
  const { isDark, glassCard, vocabulary } = h

  const sheets = useMemo(() => {
    if (!vocabulary || vocabulary.length === 0) return []
    return [vocabToSheet(vocabulary)]
  }, [vocabulary])

  const estimatedHeight = Math.max(500, (vocabulary.length + 2) * 26 + 80)

  const handleSaveFromSheet = useCallback(async () => {
    await h.saveVocabulary()
  }, [h])

  if (vocabulary.length === 0) {
    return (
      <div className={`${glassCard} rounded-2xl p-6`}>
        <p className={`text-center py-12 ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
          Keine Vokabeln vorhanden. Bitte zuerst Seiten verarbeiten.
        </p>
      </div>
    )
  }

  return (
    <div className={`${glassCard} rounded-2xl p-4`}>
      <div className="flex items-center justify-between mb-4">
        <h2 className={`text-lg font-semibold ${isDark ? 'text-white' : 'text-slate-900'}`}>
          Spreadsheet-Editor
        </h2>
        <div className="flex items-center gap-3">
          <span className={`text-sm ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
            {vocabulary.length} Vokabeln
          </span>
          <button
            onClick={handleSaveFromSheet}
            className="px-4 py-2 rounded-xl text-sm font-medium bg-gradient-to-r from-purple-500 to-pink-500 text-white hover:shadow-lg transition-all"
          >
            Speichern
          </button>
        </div>
      </div>

      <div
        className="rounded-xl overflow-hidden border"
        style={{
          borderColor: isDark ? 'rgba(255,255,255,0.1)' : 'rgba(0,0,0,0.1)',
        }}
      >
        {sheets.length > 0 && (
          <div style={{ width: '100%', height: `${estimatedHeight}px` }}>
            <Workbook
              data={sheets}
              lang="en"
              showToolbar
              showFormulaBar={false}
              showSheetTabs={false}
              toolbarItems={[
                'undo', 'redo', '|',
                'font-bold', 'font-italic', 'font-strikethrough', '|',
                'font-color', 'background', '|',
                'font-size', '|',
                'horizontal-align', 'vertical-align', '|',
                'text-wrap', '|',
                'border',
              ]}
            />
          </div>
        )}
      </div>
    </div>
  )
}