'use client'

import React from 'react'
import {
  LoeschfristPolicy, PolicyStatus, DeletionTriggerLevel,
  STATUS_COLORS, STATUS_LABELS, TRIGGER_COLORS, TRIGGER_LABELS,
  RETENTION_DRIVER_META, formatRetentionDuration, isPolicyOverdue,
  getActiveLegalHolds, getEffectiveDeletionTrigger,
} from '@/lib/sdk/loeschfristen-types'

// ---------------------------------------------------------------------------
// Badge helpers
// ---------------------------------------------------------------------------

export function renderStatusBadge(status: PolicyStatus) {
  const colors = STATUS_COLORS[status] ?? 'bg-gray-100 text-gray-800'
  const label = STATUS_LABELS[status] ?? status
  return (
    <span className={`inline-block text-xs font-semibold px-2 py-0.5 rounded-full ${colors}`}>
      {label}
    </span>
  )
}

export function renderTriggerBadge(trigger: DeletionTriggerLevel) {
  const colors = TRIGGER_COLORS[trigger] ?? 'bg-gray-100 text-gray-800'
  const label = TRIGGER_LABELS[trigger] ?? trigger
  return (
    <span className={`inline-block text-xs font-semibold px-2 py-0.5 rounded-full ${colors}`}>
      {label}
    </span>
  )
}

// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------

interface UebersichtTabProps {
  policies: LoeschfristPolicy[]
  filteredPolicies: LoeschfristPolicy[]
  stats: { total: number; active: number; draft: number; overdue: number; legalHolds: number }
  searchQuery: string
  setSearchQuery: (q: string) => void
  filter: string
  setFilter: (f: string) => void
  driverFilter: string
  setDriverFilter: (f: string) => void
  setTab: (tab: 'uebersicht' | 'editor' | 'generator' | 'export') => void
  setEditingId: (id: string | null) => void
  createNewPolicy: () => void
}

// ---------------------------------------------------------------------------
// Component
// ---------------------------------------------------------------------------

export function UebersichtTab({
  policies,
  filteredPolicies,
  stats,
  searchQuery,
  setSearchQuery,
  filter,
  setFilter,
  driverFilter,
  setDriverFilter,
  setTab,
  setEditingId,
  createNewPolicy,
}: UebersichtTabProps) {
  return (
    <div className="space-y-6">
      {/* Stats bar */}
      <div className="grid grid-cols-2 md:grid-cols-5 gap-4">
        {[
          { label: 'Gesamt', value: stats.total, color: 'text-gray-900' },
          { label: 'Aktiv', value: stats.active, color: 'text-green-600' },
          { label: 'Entwurf', value: stats.draft, color: 'text-yellow-600' },
          { label: 'Pruefung faellig', value: stats.overdue, color: 'text-red-600' },
          { label: 'Legal Holds aktiv', value: stats.legalHolds, color: 'text-orange-600' },
        ].map((s) => (
          <div key={s.label} className="bg-white rounded-xl border border-gray-200 p-6 text-center">
            <div className={`text-3xl font-bold ${s.color}`}>{s.value}</div>
            <div className="text-sm text-gray-500 mt-1">{s.label}</div>
          </div>
        ))}
      </div>

      {/* Search & filters */}
      <div className="bg-white rounded-xl border border-gray-200 p-4 space-y-3">
        <input
          type="text"
          value={searchQuery}
          onChange={(e) => setSearchQuery(e.target.value)}
          placeholder="Suche nach Name, ID oder Beschreibung..."
          className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-purple-500"
        />
        <div className="flex flex-wrap gap-2 items-center">
          <span className="text-sm text-gray-500 font-medium">Status:</span>
          {[
            { key: 'all', label: 'Alle' },
            { key: 'active', label: 'Aktiv' },
            { key: 'draft', label: 'Entwurf' },
            { key: 'review', label: 'Pruefung noetig' },
          ].map((f) => (
            <button
              key={f.key}
              onClick={() => setFilter(f.key)}
              className={`px-3 py-1 rounded-lg text-sm font-medium transition ${
                filter === f.key
                  ? 'bg-purple-600 text-white'
                  : 'bg-gray-100 text-gray-600 hover:bg-gray-200'
              }`}
            >
              {f.label}
            </button>
          ))}
          <span className="text-sm text-gray-500 font-medium ml-4">Aufbewahrungstreiber:</span>
          <select
            value={driverFilter}
            onChange={(e) => setDriverFilter(e.target.value)}
            className="px-3 py-1.5 border border-gray-300 rounded-lg text-sm focus:ring-2 focus:ring-purple-500 focus:border-purple-500"
          >
            <option value="all">Alle</option>
            {Object.entries(RETENTION_DRIVER_META).map(([key, meta]) => (
              <option key={key} value={key}>{meta.label}</option>
            ))}
          </select>
        </div>
      </div>

      {/* Policy cards or empty state */}
      {filteredPolicies.length === 0 && policies.length === 0 ? (
        <div className="bg-white rounded-xl border border-gray-200 p-12 text-center">
          <div className="text-gray-400 text-5xl mb-4">&#128203;</div>
          <h3 className="text-lg font-semibold text-gray-900 mb-2">
            Noch keine Loeschfristen angelegt
          </h3>
          <p className="text-gray-500 mb-6">
            Starten Sie den Generator, um auf Basis Ihres Unternehmensprofils
            automatisch passende Loeschfristen zu erstellen, oder legen Sie
            manuell eine neue Loeschfrist an.
          </p>
          <div className="flex justify-center gap-3">
            <button
              onClick={() => setTab('generator')}
              className="bg-purple-600 text-white hover:bg-purple-700 rounded-lg px-4 py-2 font-medium transition"
            >
              Generator starten
            </button>
            <button
              onClick={createNewPolicy}
              className="bg-gray-100 text-gray-700 hover:bg-gray-200 rounded-lg px-4 py-2 font-medium transition"
            >
              Neue Loeschfrist
            </button>
          </div>
        </div>
      ) : filteredPolicies.length === 0 ? (
        <div className="bg-white rounded-xl border border-gray-200 p-8 text-center">
          <p className="text-gray-500">Keine Loeschfristen entsprechen den aktuellen Filtern.</p>
        </div>
      ) : (
        <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
          {filteredPolicies.map((p) => {
            const trigger = getEffectiveDeletionTrigger(p)
            const activeHolds = getActiveLegalHolds(p)
            const overdue = isPolicyOverdue(p)
            return (
              <div
                key={p.policyId}
                className="bg-white rounded-xl border border-gray-200 p-6 hover:shadow-md transition relative"
              >
                {activeHolds.length > 0 && (
                  <span
                    className="absolute top-3 right-3 text-orange-500"
                    title={`${activeHolds.length} aktive Legal Hold(s)`}
                  >
                    &#9888;
                  </span>
                )}
                <div className="text-xs text-gray-400 font-mono mb-1">{p.policyId}</div>
                <h3 className="text-base font-semibold text-gray-900 mb-2 truncate">
                  {p.dataObjectName || 'Ohne Bezeichnung'}
                </h3>
                <div className="flex flex-wrap gap-1.5 mb-3">
                  {renderTriggerBadge(trigger)}
                  <span className="inline-block text-xs font-medium px-2 py-0.5 rounded-full bg-blue-100 text-blue-800">
                    {formatRetentionDuration(p.retentionDuration, p.retentionUnit)}
                  </span>
                  {renderStatusBadge(p.status)}
                  {overdue && (
                    <span className="inline-block text-xs font-semibold px-2 py-0.5 rounded-full bg-red-100 text-red-700">
                      Pruefung faellig
                    </span>
                  )}
                </div>
                {p.description && (
                  <p className="text-sm text-gray-500 mb-3 line-clamp-2">{p.description}</p>
                )}
                <button
                  onClick={() => {
                    setEditingId(p.policyId)
                    setTab('editor')
                  }}
                  className="text-sm text-purple-600 hover:text-purple-800 font-medium"
                >
                  Bearbeiten &rarr;
                </button>
              </div>
            )
          })}
        </div>
      )}

      {/* Floating action button */}
      {policies.length > 0 && (
        <div className="flex justify-end">
          <button
            onClick={createNewPolicy}
            className="bg-purple-600 text-white hover:bg-purple-700 rounded-lg px-5 py-2.5 font-medium transition shadow-sm"
          >
            + Neue Loeschfrist
          </button>
        </div>
      )}
    </div>
  )
}
