"use client";

import { useState, useEffect, useCallback } from "react";
import type { Article, ArticleFamily } from "@/src/types/article";
import type { Stabilimento, Magazzino } from "@/src/types/stabilimento";
import type { GiacenzePerArticolo } from "@/src/types/giacenza";
import type { TipoMovimento } from "@/src/types/movimento";
import ArticleCard from "./ArticleCard";
import ArticleModal from "./ArticleModal";
import MovimentoModal from "./MovimentoModal";
import StabilimentoMagazzinoSelector from "./StabilimentoMagazzinoSelector";

export default function ArticlesList() {
  const [articles, setArticles] = useState<Article[]>([]);
  const [families, setFamilies] = useState<ArticleFamily[]>([]);
  const [giacenze, setGiacenze] = useState<GiacenzePerArticolo>({});
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const [search, setSearch] = useState("");
  const [showModal, setShowModal] = useState(false);
  const [editingArticle, setEditingArticle] = useState<Article | null>(null);

  const [showMovimentoModal, setShowMovimentoModal] = useState(false);
  const [movimentoArticle, setMovimentoArticle] = useState<Article | null>(null);
  const [movimentoTipo, setMovimentoTipo] = useState<TipoMovimento>("carico");

  const [selectedStabilimento, setSelectedStabilimento] = useState<Stabilimento | null>(null);
  const [selectedMagazzino, setSelectedMagazzino] = useState<Magazzino | null>(null);

  const fetchArticles = useCallback(async () => {
    setLoading(true);
    setError(null);

    try {
      const res = await fetch("/api/articoli");
      if (!res.ok) throw new Error("Errore nel caricamento");

      const data = await res.json();
      setArticles(data.articles);
      setFamilies(data.families);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Errore sconosciuto");
    } finally {
      setLoading(false);
    }
  }, []);

  const fetchGiacenze = useCallback(async () => {
    if (!selectedStabilimento) {
      setGiacenze({});
      return;
    }

    try {
      const params = new URLSearchParams();
      if (selectedMagazzino) {
        params.set("magazzinoId", selectedMagazzino.id.toString());
      } else {
        params.set("stabilimentoId", selectedStabilimento.id.toString());
      }

      const res = await fetch(`/api/giacenze?${params}`);
      if (!res.ok) throw new Error("Errore caricamento giacenze");

      const data = await res.json();
      setGiacenze(data.giacenze);
    } catch (err) {
      console.error("Errore giacenze:", err);
      setGiacenze({});
    }
  }, [selectedStabilimento, selectedMagazzino]);

  useEffect(() => {
    fetchArticles();
  }, [fetchArticles]);

  useEffect(() => {
    fetchGiacenze();
  }, [fetchGiacenze]);

  const handleSelectionChange = ({ stabilimento, magazzino }: { 
    stabilimento: Stabilimento | null; 
    magazzino: Magazzino | null 
  }) => {
    setSelectedStabilimento(stabilimento);
    setSelectedMagazzino(magazzino);
  };

  const handleEdit = (article: Article) => {
    setEditingArticle(article);
    setShowModal(true);
  };

  const handleDelete = (deleted: Article) => {
    setArticles((prev) => prev.filter((a) => a.id !== deleted.id));
  };

  const handleSave = (saved: Article) => {
    if (editingArticle) {
      setArticles((prev) => prev.map((a) => (a.id === saved.id ? saved : a)));
    } else {
      setArticles((prev) => [saved, ...prev]);
    }
    setShowModal(false);
    setEditingArticle(null);
    fetchGiacenze();
  };

  const handleMovimento = (article: Article, tipo: TipoMovimento) => {
    setMovimentoArticle(article);
    setMovimentoTipo(tipo);
    setShowMovimentoModal(true);
  };

  const handleMovimentoSuccess = () => {
    setShowMovimentoModal(false);
    setMovimentoArticle(null);
    fetchArticles();
    fetchGiacenze();
  };

  const filteredArticles = articles.filter((article) => {
    if (!search) return true;
    const searchLower = search.toLowerCase();
    return (
      article.descrizione?.toLowerCase().includes(searchLower) ||
      article.codice?.toLowerCase().includes(searchLower) ||
      article.barcode?.toLowerCase().includes(searchLower)
    );
  });

  const sottoScorta = articles.filter((a) => a.quantita < a.quantita_minima).length;
  const magazzinoNome = selectedMagazzino?.descrizione || 
    (selectedStabilimento ? `${selectedStabilimento.descrizione}` : undefined);

  return (
    <div className="flex flex-col h-full">
      {/* Header */}
      <div className="flex items-center justify-between gap-4 mb-4">
        <div>
          <h2 className="text-lg font-semibold text-white">Articoli</h2>
          <p className="text-xs text-zinc-500">
            {articles.length} articoli 
            {sottoScorta > 0 && <span className="text-red-400 ml-1">({sottoScorta} sotto scorta)</span>}
          </p>
        </div>
        <button
          onClick={() => { setEditingArticle(null); setShowModal(true); }}
          className="p-2 rounded-lg bg-blue-600 text-white hover:bg-blue-500 transition-colors"
          title="Nuovo articolo"
        >
          <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
          </svg>
        </button>
      </div>

      {/* Selettore Stabilimento/Magazzino */}
      <div className="mb-4 p-3 rounded-lg bg-zinc-800/50 border border-zinc-800">
        <StabilimentoMagazzinoSelector onSelectionChange={handleSelectionChange} />
      </div>

      {/* Ricerca */}
      <div className="relative mb-4">
        <svg className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-zinc-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
        </svg>
        <input
          type="text"
          value={search}
          onChange={(e) => setSearch(e.target.value)}
          placeholder="Cerca articoli..."
          className="w-full pl-9 pr-3 py-2 text-sm rounded-lg bg-zinc-900 border border-zinc-800 text-white placeholder-zinc-500 focus:outline-none focus:border-blue-500"
        />
      </div>

      {/* Lista articoli */}
      <div className="flex-1 overflow-y-auto space-y-2 pr-1">
        {loading ? (
          <div className="flex items-center justify-center py-8 text-zinc-500 text-sm">
            <svg className="w-5 h-5 animate-spin mr-2" viewBox="0 0 24 24">
              <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" fill="none" />
              <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
            </svg>
            Caricamento...
          </div>
        ) : error ? (
          <div className="text-center py-8">
            <p className="text-red-400 text-sm mb-2">{error}</p>
            <button onClick={fetchArticles} className="text-xs text-blue-400 hover:underline">Riprova</button>
          </div>
        ) : filteredArticles.length === 0 ? (
          <div className="text-center py-8 text-zinc-500 text-sm">
            {search ? "Nessun articolo trovato" : "Nessun articolo"}
          </div>
        ) : (
          filteredArticles.map((article) => (
            <ArticleCard
              key={article.id}
              article={article}
              giacenzaMagazzino={selectedStabilimento ? giacenze[article.id] : undefined}
              magazzinoNome={magazzinoNome}
              onEdit={handleEdit}
              onDelete={handleDelete}
              onMovimento={handleMovimento}
            />
          ))
        )}
      </div>

      {/* Modal Articolo */}
      {showModal && (
        <ArticleModal
          article={editingArticle}
          families={families}
          onClose={() => { setShowModal(false); setEditingArticle(null); }}
          onSave={handleSave}
        />
      )}

      {/* Modal Movimento */}
      {showMovimentoModal && movimentoArticle && (
        <MovimentoModal
          article={movimentoArticle}
          tipo={movimentoTipo}
          onClose={() => { setShowMovimentoModal(false); setMovimentoArticle(null); }}
          onSuccess={handleMovimentoSuccess}
        />
      )}
    </div>
  );
}