type FiveWhyStep = { why: string; answer: string }

interface Investigation {
  id: string
  method: 'five_why' | 'fishbone' | 'other'
  five_why_steps: FiveWhyStep[] | null
  fishbone_categories: Record<string, string> | null
  findings_text: string | null
  root_cause_summary: string | null
  alcohol_test_result: string | null
  witness_statement_refs: string[]
  completed_at: string | null
  investigator: { name: string | null; email: string } | null
}

interface Props {
  investigation: Investigation
}

const METHOD_LABELS = {
  five_why: '5-Why Analysis',
  fishbone: 'Fishbone (Ishikawa)',
  other: 'Other Method',
}

export function InvestigationPanel({ investigation: inv }: Props) {
  const investigatorName = inv.investigator?.name ?? inv.investigator?.email ?? 'Unknown'

  return (
    <div className="mt-6 bg-white rounded-xl shadow-sm border border-gray-200 overflow-hidden">
      <div className="flex items-center justify-between px-5 py-4 border-b border-gray-100">
        <h2 className="text-sm font-semibold text-gray-900">Investigation</h2>
        <div className="flex items-center gap-2">
          <span className="text-xs text-gray-500">{METHOD_LABELS[inv.method] ?? inv.method}</span>
          <span className={`text-xs font-medium px-2 py-0.5 rounded-full ${
            inv.completed_at
              ? 'bg-green-100 text-green-700'
              : 'bg-yellow-100 text-yellow-700'
          }`}>
            {inv.completed_at ? 'Completed' : 'In Progress'}
          </span>
        </div>
      </div>

      <div className="px-5 py-4 space-y-5">
        <p className="text-xs text-gray-500">
          Investigator: <span className="font-medium text-gray-700">{investigatorName}</span>
          {inv.completed_at && (
            <span className="ml-2">
              · Completed {new Date(inv.completed_at).toLocaleDateString('en-MY', { day: 'numeric', month: 'short', year: 'numeric' })}
            </span>
          )}
        </p>

        {/* 5-Why steps */}
        {inv.method === 'five_why' && inv.five_why_steps && inv.five_why_steps.length > 0 && (
          <div>
            <h3 className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-3">5-Why Steps</h3>
            <ol className="space-y-3">
              {inv.five_why_steps.map((step, i) => (
                <li key={i} className="flex gap-3">
                  <span className="flex-shrink-0 w-6 h-6 rounded-full bg-blue-100 text-blue-700 text-xs font-bold flex items-center justify-center">
                    {i + 1}
                  </span>
                  <div className="flex-1 min-w-0">
                    <p className="text-xs font-medium text-gray-700">{step.why}</p>
                    {step.answer && (
                      <p className="text-sm text-gray-900 mt-0.5">{step.answer}</p>
                    )}
                  </div>
                </li>
              ))}
            </ol>
          </div>
        )}

        {/* Fishbone categories */}
        {inv.method === 'fishbone' && inv.fishbone_categories && Object.keys(inv.fishbone_categories).length > 0 && (
          <div>
            <h3 className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-3">Fishbone Categories</h3>
            <dl className="space-y-2">
              {Object.entries(inv.fishbone_categories).map(([cat, val]) => (
                <div key={cat}>
                  <dt className="text-xs font-medium text-gray-500 capitalize">{cat}</dt>
                  <dd className="text-sm text-gray-900">{val}</dd>
                </div>
              ))}
            </dl>
          </div>
        )}

        {/* Findings */}
        {inv.findings_text && (
          <div>
            <h3 className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-1">Findings</h3>
            <p className="text-sm text-gray-900 whitespace-pre-wrap">{inv.findings_text}</p>
          </div>
        )}

        {/* Root cause */}
        {inv.root_cause_summary && (
          <div className="bg-red-50 border border-red-100 rounded-lg px-4 py-3">
            <h3 className="text-xs font-semibold text-red-600 uppercase tracking-wide mb-1">Root Cause</h3>
            <p className="text-sm text-gray-900 whitespace-pre-wrap">{inv.root_cause_summary}</p>
          </div>
        )}

        {/* Alcohol test */}
        {inv.alcohol_test_result && (
          <div>
            <h3 className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-1">Alcohol Test Result</h3>
            <p className="text-sm text-gray-900">{inv.alcohol_test_result}</p>
          </div>
        )}

        {/* Witness refs */}
        {inv.witness_statement_refs && inv.witness_statement_refs.length > 0 && (
          <div>
            <h3 className="text-xs font-semibold text-gray-500 uppercase tracking-wide mb-1">Witness Statements</h3>
            <ul className="list-disc list-inside space-y-1">
              {inv.witness_statement_refs.map((ref, i) => (
                <li key={i} className="text-sm text-gray-900">{ref}</li>
              ))}
            </ul>
          </div>
        )}
      </div>
    </div>
  )
}