export const dynamic = 'force-dynamic'

import Link from 'next/link'
import { asAdmin } from '@/lib/db/with-user'
import { redirect } from 'next/navigation'
import { getSession } from '@/lib/auth/get-session'
import { capaActions, incidents } from '@/lib/db/schema'
import { eq, asc } from 'drizzle-orm'
import { StatCard } from '@/components/dashboard/stat-card'
import { CapaOwnerActions } from '@/components/capa/capa-owner-actions'
import { CapaOwnerNotesForm } from '@/components/capa/capa-owner-notes-form'

const STATUS_LABELS: Record<string, string> = {
  open: 'Open',
  in_progress: 'In Progress',
  overdue: 'Overdue',
  pending_verification: 'Pending Verification',
  verified: 'Verified',
  reopened: 'Reopened',
  closed: 'Closed',
}

const STATUS_COLORS: Record<string, string> = {
  open: 'bg-gray-100 text-gray-700',
  in_progress: 'bg-blue-100 text-blue-700',
  overdue: 'bg-red-100 text-red-700',
  pending_verification: 'bg-purple-100 text-purple-700',
  verified: 'bg-green-100 text-green-700',
  reopened: 'bg-orange-100 text-orange-700',
  closed: 'bg-gray-100 text-gray-500',
}

export default async function CapaOwnerPage() {
  const session = await getSession()
  if (!session) redirect('/login')
  if (!['capa_owner', 'admin', 'hse', 'supervisor'].includes(session.role)) redirect('/')

  const rows = await asAdmin(db =>
    db.select({
      id: capaActions.id,
      description: capaActions.description,
      dueDate: capaActions.dueDate,
      priority: capaActions.priority,
      status: capaActions.status,
      incidentId: capaActions.incidentId,
      ownerNotes: capaActions.ownerNotes,
      incidentRefNo: incidents.referenceNo,
    })
    .from(capaActions)
    .leftJoin(incidents, eq(capaActions.incidentId, incidents.id))
    .where(eq(capaActions.ownerUserId, session.sub))
    .orderBy(asc(capaActions.dueDate))
  )

  const today = new Date().toISOString().slice(0, 10)
  function isCapaOverdue(c: { status: string; dueDate: string | null }): boolean {
    if (c.status === 'overdue') return true
    return (c.status === 'open' || c.status === 'in_progress') && !!c.dueDate && c.dueDate < today
  }

  const openCount = rows.filter(c => ['open', 'in_progress', 'reopened'].includes(c.status) && !isCapaOverdue(c)).length
  const overdueCount = rows.filter(c => isCapaOverdue(c)).length
  const doneCount = rows.filter(c => ['verified', 'closed'].includes(c.status)).length

  const PRIORITY_COLORS: Record<string, string> = {
    high: 'text-red-600 font-semibold',
    med: 'text-orange-500 font-medium',
    low: 'text-gray-400',
  }

  const activeRows = rows.filter(c => !['verified', 'closed'].includes(c.status))
  const doneRows = rows.filter(c => ['verified', 'closed'].includes(c.status))

  return (
    <main className="max-w-4xl mx-auto px-4 py-6">
      <h1 className="text-2xl font-bold text-gray-900 mb-6">My CAPAs</h1>

      <div className="grid grid-cols-3 gap-4 mb-6">
        <StatCard label="Active" value={openCount} accent={openCount > 0 ? 'yellow' : 'green'} />
        <StatCard label="Overdue" value={overdueCount} accent={overdueCount > 0 ? 'red' : 'green'} />
        <StatCard label="Completed" value={doneCount} accent="green" />
      </div>

      {activeRows.length === 0 ? (
        <div className="bg-white rounded-xl shadow-sm p-8 text-center">
          <p className="text-gray-400 text-sm">No active CAPAs assigned to you.</p>
        </div>
      ) : (
        <div className="bg-white rounded-xl shadow-sm divide-y divide-gray-50">
          {activeRows.map(capa => {
            const isOverdue = isCapaOverdue(capa)
            return (
              <div key={capa.id} className={`p-4 ${isOverdue ? 'bg-red-50' : ''}`}>
                <div className="flex items-start justify-between gap-4">
                  <div className="flex-1 min-w-0">
                    <p className="text-sm text-gray-800">{capa.description}</p>
                    {capa.incidentRefNo && (
                      <Link href={`/hse/incidents/${capa.incidentId}`} className="text-xs text-blue-600 hover:underline mt-0.5 inline-block">
                        {capa.incidentRefNo}
                      </Link>
                    )}
                  </div>
                  <div className="shrink-0 text-right space-y-1">
                    <span className={`text-xs rounded-full px-2 py-0.5 ${STATUS_COLORS[capa.status] ?? 'bg-gray-100 text-gray-600'}`}>
                      {STATUS_LABELS[capa.status] ?? capa.status}
                    </span>
                    <p className={`text-xs ${isOverdue ? 'text-red-600 font-semibold' : 'text-gray-400'}`}>
                      {capa.dueDate ? `Due ${new Date(capa.dueDate).toLocaleDateString('en-MY')}` : 'No due date'}
                    </p>
                    {capa.priority && (
                      <p className={`text-xs ${PRIORITY_COLORS[capa.priority] ?? ''}`}>
                        {capa.priority.toUpperCase()} priority
                      </p>
                    )}
                    <CapaOwnerActions capaId={capa.id} currentStatus={capa.status} />
                  </div>
                </div>
                {capa.status !== 'pending_verification' && (
                  <CapaOwnerNotesForm capaId={capa.id} initialNotes={capa.ownerNotes} />
                )}
              </div>
            )
          })}
        </div>
      )}

      {doneRows.length > 0 && (
        <div className="mt-6">
          <h2 className="text-xs font-semibold text-gray-400 uppercase tracking-wide mb-2">Completed ({doneCount})</h2>
          <div className="bg-white rounded-xl shadow-sm divide-y divide-gray-50 opacity-60">
            {doneRows.map(capa => (
              <div key={capa.id} className="p-4 flex items-center justify-between">
                <p className="text-sm text-gray-500 line-clamp-1">{capa.description}</p>
                <span className={`text-xs rounded-full px-2 py-0.5 ml-4 shrink-0 ${STATUS_COLORS[capa.status] ?? 'bg-gray-100'}`}>
                  {STATUS_LABELS[capa.status] ?? capa.status}
                </span>
              </div>
            ))}
          </div>
        </div>
      )}
    </main>
  )
}