import { useMemo } from 'react'
import FileDropZone from './FileDropZone'
import { parseSequences } from '../lib/parseSequences'

interface SequenceInputProps {
  value: string
  onChange: (v: string) => void
  label: string
  placeholder?: string
  onLoadExample?: () => void
}

export default function SequenceInput({
  value,
  onChange,
  label,
  placeholder,
  onLoadExample,
}: SequenceInputProps) {
  const parsed = useMemo(() => parseSequences(value), [value])

  return (
    <div className="field">
      <div
        className="field-label"
        style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}
      >
        <span>{label}</span>
        {onLoadExample && (
          <button
            type="button"
            className="btn btn-ghost btn-sm"
            onClick={onLoadExample}
          >
            Load example
          </button>
        )}
      </div>

      <FileDropZone onFile={(text) => onChange(text)} />

      <div style={{ margin: '10px 0 6px', fontSize: 'var(--text-sm)' }} className="muted">
        …or paste sequences (FASTA, one-per-line, or comma-separated):
      </div>
      <textarea
        value={value}
        placeholder={
          placeholder ??
          '>protein_1\nMAKLVFSLCFLL...\n\nor: PEPTIDE, PEPTIDE, ...'
        }
        onChange={(e) => onChange(e.target.value)}
      />

      <div
        style={{ marginTop: 8, display: 'flex', gap: 8, alignItems: 'center' }}
      >
        <span className={'badge' + (parsed.length ? ' badge-accent' : '')}>
          {parsed.length} sequence{parsed.length === 1 ? '' : 's'} parsed
        </span>
        {value && (
          <button
            type="button"
            className="btn btn-ghost btn-sm"
            onClick={() => onChange('')}
          >
            Clear
          </button>
        )}
      </div>
    </div>
  )
}