import React, { useState, useEffect } from 'react';
import { Link } from 'react-router-dom';
import { Users, Plus, Mail, Search, X, Edit, Trash2, Loader2, AlertTriangle } from 'lucide-react';
import { getUsers, getTeams, createMember, deleteUser, updateUser, getUserById, getTenants } from '../services/dataService';
import { User, Tenant } from '../types';

export const TeamManagement: React.FC = () => {
  const [users, setUsers] = useState<User[]>([]);
  const [teams, setTeams] = useState<any[]>([]);
  const [tenants, setTenants] = useState<Tenant[]>([]);
  const [loading, setLoading] = useState(true);
  const [isSaving, setIsSaving] = useState(false);
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [isDeleteModalOpen, setIsDeleteModalOpen] = useState(false);
  const [searchTerm, setSearchTerm] = useState('');
  const [tenantFilter, setTenantFilter] = useState('all');
  const [currentUser, setCurrentUser] = useState<User | null>(null);
  const [userToDelete, setUserToDelete] = useState<User | null>(null);
  const [deleteConfirmName, setDeleteConfirmName] = useState('');
  const [editingUser, setEditingUser] = useState<User | null>(null);
  const [formData, setFormData] = useState({ 
    name: '', 
    email: '', 
    role: 'agent' as any, 
    team_id: '', 
    status: 'active' as any,
    tenant_id: ''
  });

  const loadData = async () => {
    const tid = localStorage.getItem('ctms_tenant_id');
    const uid = localStorage.getItem('ctms_user_id');
    if (!tid) return;
    setLoading(true);
    try {
      const me = uid ? await getUserById(uid) : null;
      
      const isSuperAdmin = me?.role === 'super_admin';
      const effectiveTid = isSuperAdmin ? 'all' : tid;

      const promises: Promise<any>[] = [
        getUsers(effectiveTid), 
        getTeams(effectiveTid)
      ];

      if (isSuperAdmin) {
        promises.push(getTenants());
      }

      const results = await Promise.all(promises);
      
      setUsers(isSuperAdmin ? results[0] : results[0].filter((u: User) => u.role !== 'super_admin'));
      setTeams(results[1]);
      if (isSuperAdmin && results[2]) {
        setTenants(results[2]);
      }
      
      if (me) setCurrentUser(me);
    } catch (err) { console.error(err); } finally { setLoading(false); }
  };

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

  const handleSave = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsSaving(true);
    try {
      const tid = localStorage.getItem('ctms_tenant_id') || '';
      const finalTenantId = currentUser?.role === 'super_admin' ? formData.tenant_id : tid;
      
      if (editingUser) {
        const success = await updateUser(editingUser.id, { ...formData, tenant_id: finalTenantId });
        if (success) { setIsModalOpen(false); loadData(); }
      } else {
        await createMember({ ...formData, tenant_id: finalTenantId });
        setIsModalOpen(false); 
        loadData();
      }
    } catch (err: any) { 
      alert(err.message || 'Erro ao salvar membro. Verifique se o e-mail já não está cadastrado.'); 
    } finally { 
      setIsSaving(false); 
    }
  };

  const handleConfirmDelete = async () => {
    if (!userToDelete || deleteConfirmName !== userToDelete.name) return;
    setIsSaving(true);
    try {
      if (await deleteUser(userToDelete.id)) { setIsDeleteModalOpen(false); loadData(); }
    } catch (err) { alert('Erro ao excluir'); } finally { setIsSaving(false); }
  };

  if (loading && users.length === 0) return <div className="flex h-screen items-center justify-center text-zinc-400 dark:text-dark-muted transition-colors">Carregando...</div>;

  const canManage = currentUser?.role === 'admin' || currentUser?.role === 'super_admin' || currentUser?.role === 'manager';
  const filtered = users.filter(u => 
    (u.name.toLowerCase().includes(searchTerm.toLowerCase()) || u.email.toLowerCase().includes(searchTerm.toLowerCase())) &&
    (tenantFilter === 'all' || u.tenant_id === tenantFilter)
  );

  const getRoleLabel = (role: string) => {
    if (role === 'super_admin') return 'Super Admin';
    if (role === 'admin') return 'Admin';
    if (role === 'manager') return 'Gerente';
    return 'Agente';
  };

  const getRoleBadge = (role: string) => {
    switch (role) {
      case 'admin': return 'bg-purple-100 text-purple-700 border-purple-200 dark:bg-purple-900/30 dark:text-purple-400 dark:border-purple-800';
      case 'manager': return 'bg-blue-100 text-blue-700 border-blue-200 dark:bg-blue-900/30 dark:text-blue-400 dark:border-blue-800';
      default: return 'bg-zinc-100 text-zinc-700 border-zinc-200 dark:bg-dark-input dark:text-dark-muted dark:border-dark-border';
    }
  };

  return (
    <div className="space-y-8 max-w-7xl mx-auto pb-12 transition-colors duration-300">
      <div className="flex justify-between items-center">
        <div>
          <h1 className="text-2xl font-bold text-zinc-900 dark:text-dark-text tracking-tight">Membros</h1>
          <p className="text-zinc-500 dark:text-dark-muted text-sm">Visualize e gerencie as funções dos membros da sua organização.</p>
        </div>
        {canManage && (
          <button onClick={() => { setEditingUser(null); setFormData({name:'', email:'', role:'agent', team_id:'', status:'active'}); setIsModalOpen(true); }} className="bg-zinc-900 dark:bg-brand-yellow text-white dark:text-zinc-950 px-4 py-2 rounded-lg flex items-center gap-2 text-sm font-bold shadow-sm hover:opacity-90 transition-all">
            <Plus size={16} /> Adicionar Membro
          </button>
        )}
      </div>

      <div className="bg-white dark:bg-dark-card border border-zinc-200 dark:border-dark-border rounded-xl shadow-sm overflow-hidden">
        <div className="p-4 border-b border-zinc-100 dark:border-dark-border bg-zinc-50 dark:bg-dark-bg/50 flex flex-col sm:flex-row gap-4">
          <div className="relative flex-1 max-w-md">
            <Search size={16} className="absolute left-3 top-1/2 -translate-y-1/2 text-zinc-400 dark:text-dark-muted" />
            <input type="text" placeholder="Buscar membros..." value={searchTerm} onChange={e => setSearchTerm(e.target.value)} className="w-full pl-9 pr-4 py-2 bg-white dark:bg-dark-bg border border-zinc-200 dark:border-dark-border rounded-lg text-sm text-zinc-900 dark:text-dark-text outline-none focus:ring-2 focus:ring-brand-yellow/20 transition-all" />
          </div>
          {currentUser?.role === 'super_admin' && (
            <select 
              value={tenantFilter} 
              onChange={e => setTenantFilter(e.target.value)} 
              className="bg-white dark:bg-dark-bg border border-zinc-200 dark:border-dark-border px-3 py-2 rounded-lg text-sm text-zinc-700 dark:text-dark-text outline-none focus:ring-2 focus:ring-brand-yellow/20 cursor-pointer w-full sm:w-auto transition-all"
            >
              <option value="all">Todas Organizações</option>
              {tenants.map(t => <option key={t.id} value={t.id}>{t.name}</option>)}
            </select>
          )}
        </div>
        <div className="overflow-x-auto">
          <table className="w-full text-left">
            <thead>
              <tr className="bg-zinc-50 dark:bg-dark-bg/50 text-zinc-500 dark:text-dark-muted text-xs uppercase font-bold border-b dark:border-dark-border">
                <th className="px-6 py-4">Usuário</th>
                {currentUser?.role === 'super_admin' && <th className="px-6 py-4">Organização</th>}
                <th className="px-6 py-4">Função</th>
                <th className="px-6 py-4">Time</th>
                <th className="px-6 py-4">Status</th>
                {canManage && <th className="px-6 py-4 text-right">Ações</th>}
              </tr>
            </thead>
            <tbody className="divide-y dark:divide-dark-border text-sm">
              {filtered.map(user => (
                <tr key={user.id} className="hover:bg-zinc-50 dark:hover:bg-dark-border/50 transition-colors group">
                  <td className="px-6 py-4">
                    <div className="flex items-center gap-3">
                      <div className="relative">
                        <img 
                          src={user.avatar_url 
                            ? (user.avatar_url.startsWith('http') ? user.avatar_url : `${import.meta.env.PROD ? '' : 'http://localhost:3001'}${user.avatar_url}`)
                            : `https://ui-avatars.com/api/?name=${encodeURIComponent(user.name)}&background=random`} 
                          alt="" 
                          className="w-10 h-10 rounded-full border border-zinc-200 dark:border-dark-border object-cover" 
                        />
                        <span className={`absolute bottom-0 right-0 w-2.5 h-2.5 rounded-full border-2 border-white dark:border-dark-card ${user.status === 'active' ? 'bg-green-500' : 'bg-zinc-300 dark:bg-zinc-600'}`}></span>
                      </div>
                      <div>
                        <Link to={`/users/${user.slug || user.id}`} className="font-bold text-zinc-900 dark:text-dark-text hover:underline">{user.name}</Link>
                        <div className="text-xs text-zinc-500 dark:text-dark-muted">{user.email}</div>
                      </div>
                    </div>
                  </td>
                  {currentUser?.role === 'super_admin' && (
                    <td className="px-6 py-4">
                      <span className="text-zinc-600 dark:text-zinc-300 font-medium">
                        {tenants.find(t => t.id === user.tenant_id)?.name || user.tenant_id}
                      </span>
                    </td>
                  )}
                  <td className="px-6 py-4">
                    <span className={`px-2.5 py-0.5 rounded-full text-xs font-bold border capitalize ${getRoleBadge(user.role)}`}>{getRoleLabel(user.role)}</span>
                  </td>
                  <td className="px-6 py-4 text-zinc-600 dark:text-zinc-300 font-medium">{teams.find(t => t.id === user.team_id)?.name || '-'}</td>
                  <td className="px-6 py-4">
                    <span className={`px-2 py-0.5 rounded-full text-xs font-bold border ${user.status === 'active' ? 'bg-green-100 text-green-700 border-green-200 dark:bg-green-900/30 dark:text-green-400 dark:border-green-800' : 'bg-zinc-100 text-zinc-500 border-zinc-200 dark:bg-dark-input dark:text-dark-muted dark:border-dark-border'}`}>{user.status === 'active' ? 'Ativo' : 'Inativo'}</span>
                  </td>
                  {canManage && (
                    <td className="px-6 py-4 text-right">
                      <div className="flex justify-end gap-2 opacity-0 group-hover:opacity-100 transition-opacity">
                        <button onClick={() => { setEditingUser(user); setFormData({name:user.name, email:user.email, role:user.role as any, team_id:user.team_id||'', status:user.status as any, tenant_id: user.tenant_id||''}); setIsModalOpen(true); }} className="p-2 hover:bg-zinc-100 dark:hover:bg-dark-border text-zinc-400 hover:text-zinc-900 dark:hover:text-dark-text rounded-lg transition-colors"><Edit size={16} /></button>
                        <button onClick={() => { setUserToDelete(user); setDeleteConfirmName(''); setIsDeleteModalOpen(true); }} className="p-2 hover:bg-red-50 dark:hover:bg-red-900/30 text-zinc-400 hover:text-red-600 dark:hover:text-red-400 rounded-lg transition-colors"><Trash2 size={16} /></button>
                      </div>
                    </td>
                  )}
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>

      {isModalOpen && (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-zinc-950/80 backdrop-blur-sm">
          <div className="bg-white dark:bg-dark-card rounded-2xl p-8 w-full max-w-lg shadow-2xl animate-in zoom-in duration-200 transition-colors border border-transparent dark:border-dark-border">
            <h3 className="text-xl font-bold text-zinc-900 dark:text-dark-text mb-6">{editingUser ? 'Editar Usuário' : 'Novo Membro'}</h3>
            <form onSubmit={handleSave} className="space-y-5">
              <div>
                <label className="text-xs font-bold text-zinc-500 dark:text-dark-muted uppercase mb-1 block">Nome Completo</label>
                <input type="text" value={formData.name} onChange={e => setFormData({...formData, name:e.target.value})} className="w-full bg-white dark:bg-dark-input border border-zinc-200 dark:border-dark-border p-3 rounded-lg text-sm text-zinc-900 dark:text-dark-text outline-none focus:ring-2 focus:ring-brand-yellow/20" required />
              </div>
              <div>
                <label className="text-xs font-bold text-zinc-500 dark:text-dark-muted uppercase mb-1 block">E-mail</label>
                <input type="email" value={formData.email} onChange={e => setFormData({...formData, email:e.target.value})} className="w-full bg-white dark:bg-dark-input border border-zinc-200 dark:border-dark-border p-3 rounded-lg text-sm text-zinc-900 dark:text-dark-text disabled:bg-zinc-50 dark:disabled:bg-dark-bg/50 dark:disabled:text-dark-muted" disabled={!!editingUser} required />
              </div>
              {currentUser?.role === 'super_admin' && (
                <div>
                  <label className="text-xs font-bold text-zinc-500 dark:text-dark-muted uppercase mb-1 block">Organização</label>
                  <select value={formData.tenant_id} onChange={e => setFormData({...formData, tenant_id: e.target.value})} className="w-full bg-white dark:bg-dark-input border border-zinc-200 dark:border-dark-border p-3 rounded-lg text-sm text-zinc-900 dark:text-dark-text" required>
                    <option value="">Selecione uma organização</option>
                    {tenants.map(t => <option key={t.id} value={t.id}>{t.name}</option>)}
                  </select>
                </div>
              )}
              <div className="grid grid-cols-2 gap-4">
                <div>
                  <label className="text-xs font-bold text-zinc-500 dark:text-dark-muted uppercase mb-1 block">Função</label>
                  <select 
                    value={formData.role} 
                    onChange={e => setFormData({...formData, role: e.target.value as any})} 
                    className="w-full bg-white dark:bg-dark-input border border-zinc-200 dark:border-dark-border p-3 rounded-lg text-sm text-zinc-900 dark:text-dark-text disabled:bg-zinc-50 dark:disabled:bg-dark-bg/50 dark:disabled:text-dark-muted"
                    disabled={
                      (currentUser?.role === 'manager') || 
                      (editingUser?.role === 'admin' && currentUser?.role !== 'super_admin') ||
                      (editingUser?.role === 'super_admin' && currentUser?.role !== 'super_admin')
                    }
                  >
                    <option value="agent">Agente</option>
                    <option value="manager">Gerente</option>
                    {currentUser?.role !== 'manager' && <option value="admin">Admin</option>}
                  </select>
                </div>
                <div>
                  <label className="text-xs font-bold text-zinc-500 dark:text-dark-muted uppercase mb-1 block">Time</label>
                  <select value={formData.team_id} onChange={e => setFormData({...formData, team_id: e.target.value})} className="w-full bg-white dark:bg-dark-input border border-zinc-200 dark:border-dark-border p-3 rounded-lg text-sm text-zinc-900 dark:text-dark-text">
                    <option value="">Nenhum</option>
                    {teams.filter(t => !formData.tenant_id || t.tenant_id === formData.tenant_id).map(t => <option key={t.id} value={t.id}>{t.name}</option>)}
                  </select>
                </div>
              </div>
              <div>
                <label className="text-xs font-bold text-zinc-500 dark:text-dark-muted uppercase mb-1 block">Status</label>
                <select value={formData.status} onChange={e => setFormData({...formData, status: e.target.value as any})} className="w-full bg-white dark:bg-dark-input border border-zinc-200 dark:border-dark-border p-3 rounded-lg text-sm text-zinc-900 dark:text-dark-text">
                  <option value="active">Ativo</option>
                  <option value="inactive">Inativo</option>
                </select>
              </div>
              <div className="flex justify-end gap-3 pt-6 border-t dark:border-dark-border mt-6">
                <button type="button" onClick={() => setIsModalOpen(false)} className="px-6 py-2.5 text-sm font-medium text-zinc-500 dark:text-dark-muted hover:bg-zinc-100 dark:hover:bg-dark-border rounded-lg transition-colors">Cancelar</button>
                <button type="submit" disabled={isSaving} className="bg-zinc-900 dark:bg-brand-yellow text-white dark:text-zinc-950 px-8 py-2.5 rounded-lg text-sm font-bold flex items-center gap-2 hover:opacity-90 transition-all">{isSaving ? <Loader2 className="animate-spin" size={16} /> : 'Salvar Alterações'}</button>
              </div>
            </form>
          </div>
        </div>
      )}

      {isDeleteModalOpen && userToDelete && (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-zinc-950/80 backdrop-blur-sm">
          <div className="bg-white dark:bg-dark-card rounded-2xl p-8 w-full max-w-md shadow-xl animate-in zoom-in duration-200 text-center transition-colors border border-transparent dark:border-dark-border">
            <div className="w-16 h-16 bg-red-100 dark:bg-red-900/30 text-red-600 dark:text-red-400 rounded-full flex items-center justify-center mx-auto mb-4"><AlertTriangle size={32} /></div>
            <h3 className="text-xl font-bold text-zinc-900 dark:text-dark-text mb-2">Excluir {userToDelete.name}?</h3>
            <p className="text-sm text-zinc-500 dark:text-dark-muted mb-8 leading-relaxed">Esta ação é <strong>permanente</strong>. Para confirmar, digite o nome completo dele abaixo:</p>
            <input type="text" value={deleteConfirmName} onChange={e => setDeleteConfirmName(e.target.value)} className="w-full bg-white dark:bg-dark-input border-2 border-red-50 dark:border-red-900/20 p-3 rounded-xl mb-8 text-center font-bold text-base text-zinc-900 dark:text-dark-text outline-none focus:ring-2 focus:ring-red-100 dark:focus:ring-red-900/40 transition-all" placeholder="Nome completo" />
            <div className="flex gap-3">
              <button onClick={() => setIsDeleteModalOpen(false)} className="flex-1 py-3 text-sm font-bold text-zinc-500 dark:text-dark-muted hover:bg-zinc-100 dark:hover:bg-dark-border rounded-lg border border-zinc-100 dark:border-dark-border transition-colors">Cancelar</button>
              <button onClick={handleConfirmDelete} disabled={isSaving || deleteConfirmName !== userToDelete.name} className="flex-1 py-3 text-sm font-bold bg-red-600 text-white rounded-lg disabled:opacity-50 shadow-lg shadow-red-200 dark:shadow-none transition-all hover:bg-red-700">Excluir para sempre</button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};