import { createFileRoute, useParams } from '@tanstack/react-router'
import {
  FileText,
  Download,
  RefreshCcw,
  ExternalLink,
  CheckCircle2,
  Clock,
  FileJson,
} from 'lucide-react'
import { useCallback, useEffect, useState } from 'react'

import { Button } from '@/components/ui/button'
import { Card, CardContent } from '@/components/ui/card'
import { fetchPlanPdf } from '@/data/api/document.api'

export const Route = createFileRoute('/planes/$planId/_detalle/documento')({
  component: RouteComponent,
})

function RouteComponent() {
  const { planId } = useParams({ from: '/planes/$planId/_detalle/documento' })
  const [pdfUrl, setPdfUrl] = useState<string | null>(null)
  const [isLoading, setIsLoading] = useState(true)

  const loadPdfPreview = useCallback(async () => {
    try {
      setIsLoading(true)
      const pdfBlob = await fetchPlanPdf({ plan_estudio_id: planId })
      const url = window.URL.createObjectURL(pdfBlob)

      // Limpiar URL anterior si existe para evitar fugas de memoria
      if (pdfUrl) window.URL.revokeObjectURL(pdfUrl)

      setPdfUrl(url)
    } catch (error) {
      console.error('Error cargando preview:', error)
    } finally {
      setIsLoading(false)
    }
  }, [planId])

  useEffect(() => {
    loadPdfPreview()
    return () => {
      if (pdfUrl) window.URL.revokeObjectURL(pdfUrl)
    }
  }, [loadPdfPreview])

  const handleDownloadPdf = async () => {
    try {
      const pdfBlob = await fetchPlanPdf({
        plan_estudio_id: planId,
      })

      const url = window.URL.createObjectURL(pdfBlob)
      const link = document.createElement('a')
      link.href = url
      link.download = 'plan_estudios.pdf'
      document.body.appendChild(link)
      link.click()

      link.remove()
      window.URL.revokeObjectURL(url)
    } catch (error) {
      console.error(error)
      alert('No se pudo generar el PDF')
    }
  }
  return (
    <div className="flex min-h-screen flex-col gap-6 bg-slate-50/30 p-6">
      {/* HEADER DE ACCIONES */}
      <div className="flex flex-col items-start justify-between gap-4 md:flex-row md:items-center">
        <div>
          <h1 className="text-xl font-bold text-slate-800">
            Documento del Plan
          </h1>
          <p className="text-muted-foreground text-sm">
            Vista previa y descarga del documento oficial
          </p>
        </div>
        <div className="flex gap-2">
          <Button
            variant="outline"
            size="sm"
            className="gap-2"
            onClick={loadPdfPreview}
          >
            <RefreshCcw size={16} /> Regenerar
          </Button>
          <Button variant="outline" size="sm" className="gap-2">
            <Download size={16} /> Descargar Word
          </Button>
          <Button
            size="sm"
            className="gap-2 bg-teal-700 hover:bg-teal-800"
            onClick={handleDownloadPdf}
          >
            <Download size={16} /> Descargar PDF
          </Button>
        </div>
      </div>

      {/* TARJETAS DE ESTADO */}
      <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
        <StatusCard
          icon={<CheckCircle2 className="text-green-500" />}
          label="Estado"
          value="Generado"
        />
        <StatusCard
          icon={<Clock className="text-blue-500" />}
          label="Última generación"
          value="28 Ene 2024, 11:30"
        />
        <StatusCard
          icon={<FileJson className="text-orange-500" />}
          label="Versión"
          value="v1.2"
        />
      </div>

      {/* CONTENEDOR DEL DOCUMENTO (Visor) */}
      {/* CONTENEDOR DEL VISOR REAL */}
      <Card className="overflow-hidden border-slate-200 shadow-sm">
        <div className="flex items-center justify-between border-b bg-slate-100/50 p-2 px-4">
          <div className="flex items-center gap-2 text-xs font-medium text-slate-500">
            <FileText size={14} /> Preview_Documento.pdf
          </div>
          {pdfUrl && (
            <Button
              variant="ghost"
              size="sm"
              className="h-7 gap-1 text-xs"
              onClick={() => window.open(pdfUrl, '_blank')}
            >
              Abrir en nueva pestaña <ExternalLink size={12} />
            </Button>
          )}
        </div>

        <CardContent className="flex min-h-[800px] justify-center bg-slate-500 p-0">
          {isLoading ? (
            <div className="flex flex-col items-center justify-center gap-4 text-white">
              <RefreshCcw size={40} className="animate-spin opacity-50" />
              <p className="animate-pulse">Generando vista previa del PDF...</p>
            </div>
          ) : pdfUrl ? (
            /* 3. VISOR DE PDF REAL */
            <iframe
              src={`${pdfUrl}#toolbar=0&navpanes=0`}
              className="h-[1000px] w-full max-w-[1000px] border-none shadow-2xl"
              title="PDF Preview"
            />
          ) : (
            <div className="flex items-center justify-center p-20 text-slate-400">
              No se pudo cargar la vista previa.
            </div>
          )}
        </CardContent>
      </Card>
    </div>
  )
}

// Componente pequeño para las tarjetas de estado superior
function StatusCard({
  icon,
  label,
  value,
}: {
  icon: React.ReactNode
  label: string
  value: string
}) {
  return (
    <Card className="border-slate-200 bg-white">
      <CardContent className="flex items-center gap-4 p-4">
        <div className="rounded-full border bg-slate-50 p-2">{icon}</div>
        <div>
          <p className="text-[10px] font-bold tracking-tight text-slate-400 uppercase">
            {label}
          </p>
          <p className="text-sm font-semibold text-slate-700">{value}</p>
        </div>
      </CardContent>
    </Card>
  )
}