import { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Users,
  Plus,
  MoreVertical,
  Eye,
  UserCheck,
  XCircle,
  RefreshCw,
  Search,
  Star,
  Phone,
  Mail,
  TrendingUp,
} from 'lucide-react';
import { Button } from '@components/atoms/Button';
import { Card, CardHeader, CardTitle, CardContent } from '@components/molecules/Card';
import { DataTable, type Column } from '@components/organisms/DataTable';
import { Dropdown, type DropdownItem } from '@components/organisms/Dropdown';
import { Breadcrumbs } from '@components/organisms/Breadcrumbs';
import { ConfirmModal } from '@components/organisms/Modal';
import { NoDataEmptyState, ErrorEmptyState } from '@components/templates/EmptyState';
import { useLeads } from '@features/crm/hooks';
import type { Lead, LeadStatus, LeadSource } from '@features/crm/types';
import { formatNumber } from '@utils/formatters';

const statusLabels: Record<LeadStatus, string> = {
  new: 'Nuevo',
  contacted: 'Contactado',
  qualified: 'Calificado',
  converted: 'Convertido',
  lost: 'Perdido',
};

const statusColors: Record<LeadStatus, string> = {
  new: 'bg-blue-100 text-blue-700',
  contacted: 'bg-yellow-100 text-yellow-700',
  qualified: 'bg-green-100 text-green-700',
  converted: 'bg-purple-100 text-purple-700',
  lost: 'bg-red-100 text-red-700',
};

const sourceLabels: Record<LeadSource, string> = {
  website: 'Sitio Web',
  phone: 'Telefono',
  email: 'Email',
  referral: 'Referido',
  social_media: 'Redes Sociales',
  advertising: 'Publicidad',
  event: 'Evento',
  other: 'Otro',
};

const formatCurrency = (value: number): string => {
  return formatNumber(value, 'es-MX', { minimumFractionDigits: 0, maximumFractionDigits: 0 });
};

export function LeadsPage() {
  const navigate = useNavigate();
  const [selectedStatus, setSelectedStatus] = useState<LeadStatus | ''>('');
  const [selectedSource, setSelectedSource] = useState<LeadSource | ''>('');
  const [searchTerm, setSearchTerm] = useState('');
  const [leadToConvert, setLeadToConvert] = useState<Lead | null>(null);
  const [leadToLose, setLeadToLose] = useState<Lead | null>(null);

  const {
    leads,
    total,
    page,
    totalPages,
    isLoading,
    error,
    setPage,
    refresh,
    convertLead,
    markLeadLost,
  } = useLeads({
    status: selectedStatus || undefined,
    source: selectedSource || undefined,
    search: searchTerm || undefined,
    limit: 20,
  });

  const getActionsMenu = (lead: Lead): DropdownItem[] => {
    const items: DropdownItem[] = [
      {
        key: 'view',
        label: 'Ver detalle',
        icon: <Eye className="h-4 w-4" />,
        onClick: () => navigate(`/crm/leads/${lead.id}`),
      },
    ];

    if (lead.status !== 'converted' && lead.status !== 'lost') {
      items.push({
        key: 'convert',
        label: 'Convertir a oportunidad',
        icon: <UserCheck className="h-4 w-4" />,
        onClick: () => setLeadToConvert(lead),
      });
      items.push({
        key: 'lose',
        label: 'Marcar como perdido',
        icon: <XCircle className="h-4 w-4" />,
        danger: true,
        onClick: () => setLeadToLose(lead),
      });
    }

    return items;
  };

  const columns: Column<Lead>[] = [
    {
      key: 'name',
      header: 'Lead',
      render: (lead) => (
        <div className="flex items-center gap-3">
          <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-blue-50">
            <Users className="h-5 w-5 text-blue-600" />
          </div>
          <div>
            <div className="font-medium text-gray-900">{lead.name}</div>
            {lead.contactName && (
              <div className="text-sm text-gray-500">{lead.contactName}</div>
            )}
          </div>
        </div>
      ),
    },
    {
      key: 'contact',
      header: 'Contacto',
      render: (lead) => (
        <div className="space-y-1">
          {lead.email && (
            <div className="flex items-center gap-1 text-sm text-gray-600">
              <Mail className="h-3 w-3" />
              {lead.email}
            </div>
          )}
          {lead.phone && (
            <div className="flex items-center gap-1 text-sm text-gray-600">
              <Phone className="h-3 w-3" />
              {lead.phone}
            </div>
          )}
        </div>
      ),
    },
    {
      key: 'source',
      header: 'Origen',
      render: (lead) => (
        <span className="text-sm text-gray-600">
          {lead.source ? sourceLabels[lead.source] : '-'}
        </span>
      ),
    },
    {
      key: 'probability',
      header: 'Probabilidad',
      render: (lead) => (
        <div className="flex items-center gap-2">
          <div className="h-2 w-16 rounded-full bg-gray-200">
            <div
              className="h-2 rounded-full bg-blue-500"
              style={{ width: `${lead.probability}%` }}
            />
          </div>
          <span className="text-sm text-gray-600">{lead.probability}%</span>
        </div>
      ),
    },
    {
      key: 'expectedRevenue',
      header: 'Ingreso Esperado',
      render: (lead) => (
        <div className="text-right">
          <span className="font-medium text-gray-900">
            {lead.expectedRevenue ? `$${formatCurrency(lead.expectedRevenue)}` : '-'}
          </span>
        </div>
      ),
    },
    {
      key: 'priority',
      header: 'Prioridad',
      render: (lead) => (
        <div className="flex items-center gap-1">
          {Array.from({ length: 3 }).map((_, i) => (
            <Star
              key={i}
              className={`h-4 w-4 ${i < lead.priority ? 'fill-amber-400 text-amber-400' : 'text-gray-300'}`}
            />
          ))}
        </div>
      ),
    },
    {
      key: 'status',
      header: 'Estado',
      render: (lead) => (
        <span className={`inline-flex rounded-full px-2 py-1 text-xs font-medium ${statusColors[lead.status]}`}>
          {statusLabels[lead.status]}
        </span>
      ),
    },
    {
      key: 'actions',
      header: '',
      render: (lead) => (
        <Dropdown
          trigger={
            <button className="rounded p-1 hover:bg-gray-100">
              <MoreVertical className="h-4 w-4 text-gray-500" />
            </button>
          }
          items={getActionsMenu(lead)}
          align="right"
        />
      ),
    },
  ];

  const handleConvert = async () => {
    if (leadToConvert) {
      await convertLead(leadToConvert.id, { createOpportunity: true });
      setLeadToConvert(null);
    }
  };

  const handleLose = async () => {
    if (leadToLose) {
      await markLeadLost(leadToLose.id, 'Perdido por el usuario');
      setLeadToLose(null);
    }
  };

  // Calculate summary stats
  const newCount = leads.filter(l => l.status === 'new').length;
  const qualifiedCount = leads.filter(l => l.status === 'qualified').length;
  const convertedCount = leads.filter(l => l.status === 'converted').length;
  const totalExpectedRevenue = leads.reduce((sum, l) => sum + (l.expectedRevenue || 0), 0);

  if (error) {
    return (
      <div className="p-6">
        <ErrorEmptyState onRetry={refresh} />
      </div>
    );
  }

  return (
    <div className="space-y-6 p-6">
      <Breadcrumbs items={[
        { label: 'CRM', href: '/crm' },
        { label: 'Leads' },
      ]} />

      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">Leads</h1>
          <p className="text-sm text-gray-500">
            Gestiona prospectos y convierte leads en oportunidades
          </p>
        </div>
        <div className="flex gap-2">
          <Button variant="outline" onClick={refresh} disabled={isLoading}>
            <RefreshCw className={`mr-2 h-4 w-4 ${isLoading ? 'animate-spin' : ''}`} />
            Actualizar
          </Button>
          <Button>
            <Plus className="mr-2 h-4 w-4" />
            Nuevo lead
          </Button>
        </div>
      </div>

      {/* Summary Stats */}
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-4">
        <Card className="cursor-pointer hover:shadow-md transition-shadow" onClick={() => setSelectedStatus('new')}>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-blue-100">
                <Users className="h-5 w-5 text-blue-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Nuevos</div>
                <div className="text-xl font-bold text-blue-600">{newCount}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        <Card className="cursor-pointer hover:shadow-md transition-shadow" onClick={() => setSelectedStatus('qualified')}>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-green-100">
                <Star className="h-5 w-5 text-green-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Calificados</div>
                <div className="text-xl font-bold text-green-600">{qualifiedCount}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        <Card className="cursor-pointer hover:shadow-md transition-shadow" onClick={() => setSelectedStatus('converted')}>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-purple-100">
                <UserCheck className="h-5 w-5 text-purple-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Convertidos</div>
                <div className="text-xl font-bold text-purple-600">{convertedCount}</div>
              </div>
            </div>
          </CardContent>
        </Card>

        <Card>
          <CardContent className="p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-amber-100">
                <TrendingUp className="h-5 w-5 text-amber-600" />
              </div>
              <div>
                <div className="text-sm text-gray-500">Potencial Total</div>
                <div className="text-xl font-bold text-amber-600">${formatCurrency(totalExpectedRevenue)}</div>
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      <Card>
        <CardHeader>
          <CardTitle>Lista de Leads</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="space-y-4">
            {/* Filters */}
            <div className="flex flex-wrap items-center gap-4">
              <div className="relative flex-1 min-w-[200px]">
                <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-gray-400" />
                <input
                  type="text"
                  placeholder="Buscar leads..."
                  value={searchTerm}
                  onChange={(e) => setSearchTerm(e.target.value)}
                  className="w-full rounded-md border border-gray-300 py-2 pl-10 pr-4 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
                />
              </div>

              <select
                value={selectedStatus}
                onChange={(e) => setSelectedStatus(e.target.value as LeadStatus | '')}
                className="rounded-md border border-gray-300 px-3 py-2 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
              >
                <option value="">Todos los estados</option>
                {Object.entries(statusLabels).map(([value, label]) => (
                  <option key={value} value={value}>{label}</option>
                ))}
              </select>

              <select
                value={selectedSource}
                onChange={(e) => setSelectedSource(e.target.value as LeadSource | '')}
                className="rounded-md border border-gray-300 px-3 py-2 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500"
              >
                <option value="">Todos los origenes</option>
                {Object.entries(sourceLabels).map(([value, label]) => (
                  <option key={value} value={value}>{label}</option>
                ))}
              </select>

              {(selectedStatus || selectedSource || searchTerm) && (
                <Button
                  variant="ghost"
                  size="sm"
                  onClick={() => {
                    setSelectedStatus('');
                    setSelectedSource('');
                    setSearchTerm('');
                  }}
                >
                  Limpiar filtros
                </Button>
              )}
            </div>

            {/* Table */}
            {leads.length === 0 && !isLoading ? (
              <NoDataEmptyState
                entityName="leads"
              />
            ) : (
              <DataTable
                data={leads}
                columns={columns}
                isLoading={isLoading}
                pagination={{
                  page,
                  totalPages,
                  total,
                  limit: 20,
                  onPageChange: setPage,
                }}
              />
            )}
          </div>
        </CardContent>
      </Card>

      {/* Convert Lead Modal */}
      <ConfirmModal
        isOpen={!!leadToConvert}
        onClose={() => setLeadToConvert(null)}
        onConfirm={handleConvert}
        title="Convertir lead"
        message={`¿Convertir "${leadToConvert?.name}" en una oportunidad de venta?`}
        variant="success"
        confirmText="Convertir"
      />

      {/* Lose Lead Modal */}
      <ConfirmModal
        isOpen={!!leadToLose}
        onClose={() => setLeadToLose(null)}
        onConfirm={handleLose}
        title="Marcar como perdido"
        message={`¿Marcar el lead "${leadToLose?.name}" como perdido? Esta accion no se puede deshacer.`}
        variant="danger"
        confirmText="Marcar como perdido"
      />
    </div>
  );
}

export default LeadsPage;