import React, { useState, useEffect } from 'react';
import { api } from '../stores/api';
import PageHeader from '../components/PageHeader';
import SuccessCheck from '../components/SuccessCheck';

export default function RedigerPV() {
  const [reunions, setReunions] = useState([]);
  const [pvList, setPvList] = useState([]);
  const [propositions, setPropositions] = useState([]);
  const [reunionId, setReunionId] = useState('');
  const [contenu, setContenu] = useState('');
  const [decisions, setDecisions] = useState([]);
  const [loading, setLoading] = useState(true);
  const [success, setSuccess] = useState(false);
  const [viewPv, setViewPv] = useState(null);
  const [error, setError] = useState('');

  useEffect(() => {
    Promise.all([
      api.get('/presences/reunions'),
      api.get('/pv/'),
      api.get('/propositions/?statut=secondee'),
    ]).then(([r, p, props]) => {
      setReunions(r);
      setPvList(p);
      setPropositions(props);
      setLoading(false);
    }).catch(() => setLoading(false));
  }, []);

  // Auto-renseigner les décisions depuis les propositions secondées
  const chargerPropositions = () => {
    if (propositions.length === 0) return;
    const decisionsAuto = propositions.map((p) => ({
      sujet: p.sujet,
      decision: p.description || '',
      proposeur: p.proposeur_prenom,
      secondeur: p.secondeur_prenom || '',
      statut: 'en_attente',
      proposition_id: p.id,
    }));
    setDecisions((prev) => {
      // Ne pas dupliquer les propositions déjà ajoutées
      const existants = new Set(prev.map((d) => d.proposition_id).filter(Boolean));
      const nouvelles = decisionsAuto.filter((d) => !existants.has(d.proposition_id));
      return [...prev, ...nouvelles];
    });
  };

  const ajouterDecision = () => {
    setDecisions([...decisions, { sujet: '', decision: '', proposeur: '', secondeur: '', statut: 'en_attente' }]);
  };

  const updateDecision = (idx, field, value) => {
    const copy = [...decisions];
    copy[idx][field] = value;
    setDecisions(copy);
  };

  const supprimerDecision = (idx) => {
    setDecisions(decisions.filter((_, i) => i !== idx));
  };

  const handleSubmit = async () => {
    if (!reunionId) { setError("Sélectionnez une réunion d'affaires"); return; }
    if (!contenu.trim()) { setError('Le contenu du PV est obligatoire'); return; }
    setError('');
    try {
      const validDecisions = decisions.filter((d) => d.sujet.trim());
      await api.post('/pv/', {
        reunion_id: reunionId,
        contenu: contenu.trim(),
        decisions: validDecisions.length > 0 ? validDecisions : null,
      });
      setSuccess(true);
    } catch (e) { setError(e.message); }
  };

  if (success) return <SuccessCheck message="Procès-verbal enregistré ✓" />;

  // Vue lecture d'un PV existant
  if (viewPv) {
    return (
      <div className="min-h-screen bg-gray-100">
        <div className="bg-aa-blue text-white p-4 flex items-center gap-3">
          <button onClick={() => setViewPv(null)} className="text-2xl">←</button>
          <div>
            <h1 className="text-lg font-bold">Procès-verbal</h1>
            <p className="text-blue-200 text-xs">
              {viewPv.date_reunion ? new Date(viewPv.date_reunion).toLocaleDateString('fr-CA') : ''}
            </p>
          </div>
        </div>
        <div className="p-4 space-y-4">
          <div className="bg-white rounded-2xl p-4 shadow-sm">
            <div className="flex items-center justify-between mb-2">
              <p className="text-xs text-gray-400">Rédigé par {viewPv.redacteur_prenom}</p>
              {viewPv.approuve && (
                <span className="bg-green-100 text-green-700 text-xs px-2 py-1 rounded-full font-bold">Approuvé</span>
              )}
            </div>
            <div className="text-gray-800 whitespace-pre-wrap text-sm leading-relaxed">{viewPv.contenu}</div>
          </div>
          {viewPv.decisions && viewPv.decisions.length > 0 && (
            <div className="bg-white rounded-2xl p-4 shadow-sm">
              <h3 className="font-bold text-gray-700 mb-3">Décisions</h3>
              {viewPv.decisions.map((d, i) => (
                <div key={i} className="py-2 border-b border-gray-100 last:border-0">
                  <p className="font-medium text-gray-800">{d.sujet}</p>
                  <p className="text-sm text-gray-600">{d.decision}</p>
                  <p className="text-xs text-gray-400 mt-1">
                    {d.proposeur && `Proposé par ${d.proposeur}`}
                    {d.secondeur && `, secondé par ${d.secondeur}`}
                  </p>
                </div>
              ))}
            </div>
          )}
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gray-100">
      <PageHeader titre="Rédiger un PV" sousTitre="M1 — Procès-verbal" />

      <div className="p-4 space-y-4">
        {/* PV existants */}
        {pvList.length > 0 && (
          <div className="bg-white rounded-2xl p-4 shadow-sm">
            <h2 className="text-xs font-bold text-gray-400 uppercase tracking-wider mb-2">PV récents</h2>
            {pvList.slice(0, 5).map((p) => (
              <button key={p.id} onClick={() => setViewPv(p)}
                className="w-full flex items-center justify-between py-2 border-b border-gray-50 last:border-0 active:bg-gray-50">
                <div>
                  <p className="font-medium text-sm text-gray-800">
                    {p.date_reunion ? new Date(p.date_reunion).toLocaleDateString('fr-CA') : 'Sans date'}
                  </p>
                  <p className="text-xs text-gray-400">Par {p.redacteur_prenom}</p>
                </div>
                <span className="text-gray-300">→</span>
              </button>
            ))}
          </div>
        )}

        {/* Nouveau PV */}
        <div className="bg-white rounded-2xl p-4 shadow-sm">
          <h2 className="font-bold text-gray-700 mb-3">Nouveau procès-verbal</h2>

          <label className="text-xs text-gray-400 block mb-1">Réunion d'affaires</label>
          <select value={reunionId} onChange={(e) => setReunionId(e.target.value)}
            className="w-full p-3 bg-gray-50 rounded-xl border-0 focus:ring-2 focus:ring-aa-blue mb-3">
            <option value="">Sélectionner</option>
            {reunions.map((r) => (
              <option key={r.id} value={r.id}>
                {new Date(r.date_reunion).toLocaleDateString('fr-CA')}
                {r.presences?.length > 0 ? ` (${r.presences.filter(p => p.present).length} présents)` : ''}
              </option>
            ))}
          </select>

          <label className="text-xs text-gray-400 block mb-1">Contenu du PV</label>
          <textarea value={contenu} onChange={(e) => setContenu(e.target.value)} rows={8}
            placeholder={"Ouverture de la réunion à 19h00...\n\nLecture du PV précédent...\n\nRapport du trésorier...\n\nRapport du RSG..."}
            className="w-full p-3 bg-gray-50 rounded-xl border-0 focus:ring-2 focus:ring-aa-blue resize-none text-sm" />
        </div>

        {/* Décisions */}
        <div className="bg-white rounded-2xl p-4 shadow-sm">
          <div className="flex items-center justify-between mb-3">
            <h2 className="font-bold text-gray-700">Affaires nouvelles / Décisions</h2>
            <div className="flex gap-2">
              {propositions.length > 0 && (
                <button onClick={chargerPropositions}
                  className="text-purple-600 text-xs font-medium bg-purple-50 px-2 py-1 rounded-lg active:opacity-60">
                  📋 Importer propositions ({propositions.length})
                </button>
              )}
              <button onClick={ajouterDecision}
                className="text-aa-blue text-sm font-medium active:opacity-60">+ Ajouter</button>
            </div>
          </div>
          {decisions.length === 0 ? (
            <div className="text-gray-400 text-sm">
              <p>Aucune décision.</p>
              {propositions.length > 0 && (
                <p className="mt-1 text-purple-500 text-xs">
                  {propositions.length} proposition{propositions.length > 1 ? 's' : ''} secondée{propositions.length > 1 ? 's' : ''} à traiter — cliquez « Importer propositions ».
                </p>
              )}
            </div>
          ) : (
            <div className="space-y-3">
              {decisions.map((d, i) => (
                <div key={i} className={`rounded-xl p-3 space-y-2 ${d.proposition_id ? 'bg-purple-50' : 'bg-gray-50'}`}>
                  <div className="flex justify-between">
                    <span className="text-xs text-gray-400">
                      {d.proposition_id ? '📋 Proposition importée' : `Décision ${i + 1}`}
                    </span>
                    <button onClick={() => supprimerDecision(i)} className="text-red-400 text-xs">Supprimer</button>
                  </div>
                  <input type="text" placeholder="Sujet" value={d.sujet}
                    onChange={(e) => updateDecision(i, 'sujet', e.target.value)}
                    className="w-full p-2 bg-white rounded-lg border-0 text-sm focus:ring-2 focus:ring-aa-blue" />
                  <input type="text" placeholder="Décision prise" value={d.decision}
                    onChange={(e) => updateDecision(i, 'decision', e.target.value)}
                    className="w-full p-2 bg-white rounded-lg border-0 text-sm focus:ring-2 focus:ring-aa-blue" />
                  <div className="grid grid-cols-2 gap-2">
                    <input type="text" placeholder="Proposeur" value={d.proposeur}
                      onChange={(e) => updateDecision(i, 'proposeur', e.target.value)}
                      className="p-2 bg-white rounded-lg border-0 text-sm focus:ring-2 focus:ring-aa-blue" />
                    <input type="text" placeholder="Secondeur" value={d.secondeur}
                      onChange={(e) => updateDecision(i, 'secondeur', e.target.value)}
                      className="p-2 bg-white rounded-lg border-0 text-sm focus:ring-2 focus:ring-aa-blue" />
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>

        {error && <p className="text-red-500 text-sm text-center bg-red-50 p-3 rounded-lg">{error}</p>}

        <button onClick={handleSubmit}
          disabled={!reunionId || !contenu.trim()}
          className="w-full p-5 bg-indigo-600 text-white rounded-2xl text-xl font-bold disabled:opacity-40 active:scale-[0.97] transition shadow-lg">
          📝 Enregistrer le PV
        </button>
      </div>
    </div>
  );
}