import { createFileRoute, useRouter, Link } from "@tanstack/react-router"
import { useMemo, useState } from "react"
import { supabase, useSupabaseAuth } from "@/auth/supabase"
import { Input } from "@/components/ui/input"
import { Button } from "@/components/ui/button"
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { Badge } from "@/components/ui/badge"
import * as Icons from "lucide-react"
import { Plus, RefreshCcw, Building2, ScrollText, BookOpen } from "lucide-react"

export type PlanDeEstudios = {
  id: string; nombre: string; nivel: string | null; duracion: string | null;
  total_creditos: number | null; estado: string | null; fecha_creacion: string | null; carrera_id: string | null
}
type PlanRow = PlanDeEstudios & {
  carreras: {
    id: string; nombre: string;
    facultades?: { id: string; nombre: string; color?: string | null; icon?: string | null } | null
  } | null
}

export const Route = createFileRoute("/_authenticated/planes")({
  component: RouteComponent,
  loader: async () => {
    const { data, error } = await supabase
      .from("plan_estudios")
      .select(`
        *,
        carreras (
          id,
          nombre,
          facultades:facultades ( id, nombre, color, icon )
        )
      `)
      .order("fecha_creacion", { ascending: false })
      .limit(100)
    if (error) throw new Error(error.message)
    return (data ?? []) as PlanRow[]
  },

})

/* ---------- helpers de estilo suave ---------- */
function hexToRgb(hex?: string | null): [number, number, number] {
  if (!hex) return [37, 99, 235] // azul por defecto
  const h = hex.replace('#', '')
  const v = h.length === 3 ? h.split('').map(c => c + c).join('') : h
  const n = parseInt(v, 16)
  return [(n >> 16) & 255, (n >> 8) & 255, n & 255]
}
function softCardStyles(color?: string | null) {
  const [r, g, b] = hexToRgb(color)
  return {
    // borde + velo muy sutil del color de la facultad
    borderColor: `rgba(${r},${g},${b},.28)`,
    background: `linear-gradient(180deg, rgba(${r},${g},${b},.15), rgba(${r},${g},${b},.02))`,
  } as React.CSSProperties
}

function RouteComponent() {
  const auth = useSupabaseAuth()
  const [q, setQ] = useState("")
  const data = Route.useLoaderData() as PlanRow[]
  const router = useRouter()

  const showFacultad = auth.claims?.role === "lci" || auth.claims?.role === "vicerrectoria"
  const showCarrera = showFacultad || auth.claims?.role === "secretario_academico"

  const filtered = useMemo(() => {
    const term = q.trim().toLowerCase()
    if (!term || !data) return data
    return data.filter((p) =>
      [p.nombre, p.nivel, p.estado, p.carreras?.nombre, p.carreras?.facultades?.nombre]
        .filter(Boolean)
        .some((v) => String(v).toLowerCase().includes(term))
    )
  }, [q, data])

  return (
    <div className="space-y-4">
      <Card>
        <CardHeader className="flex flex-col gap-2 md:flex-row md:items-center md:justify-between">
          <CardTitle className="text-xl">Planes de estudio</CardTitle>
          <div className="flex w-full items-center gap-2 md:w-auto">
            <div className="relative w-full md:w-80">
              <Input value={q} onChange={(e) => setQ(e.target.value)} placeholder="Buscar por nombre, nivel, estado…" />
            </div>
            <Button variant="outline" size="icon" onClick={() => router.invalidate()} title="Recargar">
              <RefreshCcw className="h-4 w-4" />
            </Button>
            <Button>
              <Plus className="mr-2 h-4 w-4" /> Nuevo plan
            </Button>
          </div>
        </CardHeader>

        {/* GRID de tarjetas con estilo suave por facultad */}
        <CardContent>
          <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4">
            {filtered?.map((p) => {
              const fac = p.carreras?.facultades
              const styles = softCardStyles(fac?.color)
              const IconComp = (fac?.icon && (Icons as any)[fac.icon]) || Building2

              return (
                <Link
                  key={p.id}
                  to="/planes/$planId/modal"
                  className="group relative overflow-hidden rounded-3xl bg-white shadow-sm ring-1 transition-all hover:shadow-md hover:-translate-y-0.5"
                  params={{ planId: p.id }}
                  style={styles}
                >
                  <div className="relative p-5 h-40 flex flex-col justify-between">
                    <div className="flex items-center gap-3">
                      <span className="inline-flex items-center justify-center rounded-2xl border px-2.5 py-2"
                        style={{ borderColor: styles.borderColor as string, background: 'rgba(255,255,255,.6)' }}>
                        <IconComp className="w-6 h-6" />
                      </span>
                      <div className="min-w-0">
                        <div className="font-semibold truncate">{p.nombre}</div>
                        <div className="text-xs text-neutral-600 truncate">
                          {p.nivel ?? "—"} {p.duracion ? `· ${p.duracion}` : ""}
                        </div>
                      </div>
                    </div>

                    <div className="flex items-center gap-2 text-xs">
                      {showCarrera && p.carreras?.nombre && (
                        <Badge variant="secondary" className="border text-neutral-700 bg-white/70 w-fit">
                          <ScrollText className="mr-1 h-3 w-3" /> {p.carreras?.nombre}
                        </Badge>
                      )}
                      {showFacultad && fac?.nombre && (
                        <Badge variant="outline" className="bg-white/60 w-fit" style={{ borderColor: styles.borderColor }}>
                          <BookOpen className="mr-1 h-3 w-3" /> {fac?.nombre}
                        </Badge>
                      )}
                      {p.estado && (
                        <Badge variant="outline" className="ml-auto bg-white/60" style={{ borderColor: styles.borderColor }}>
                          {p.estado}
                        </Badge>
                      )}
                    </div>
                  </div>
                </Link>
              )
            })}
          </div>

          {!filtered?.length && (
            <div className="text-center text-sm text-muted-foreground py-10">Sin resultados</div>
          )}
        </CardContent>
      </Card>
    </div>
  )
}