'use client';

import * as React from 'react';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { Plus, KeyRound, Trash2, Pencil, Copy, Eye, EyeOff } from 'lucide-react';
import { PageHeader } from '@/components/layout/page-header';
import { RequirePermission } from '@/components/require-permission';
import { DataTable, type DataTableColumn } from '@/components/data-table/data-table';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from '@/components/ui/dialog';
import { useToast } from '@/components/ui/toast';
import { useAuth } from '@/hooks/use-auth';
import { useDebounce } from '@/hooks/use-debounce';
import { extensionsService, type ExtensionInput } from '@/services/extensions';
import type { Extension } from '@/types';
import { errorMessage } from '@/lib/error-message';
import { formatDateTime } from '@/lib/utils';

function ExtensionFormDialog({
  open,
  onOpenChange,
  extension,
}: {
  open: boolean;
  onOpenChange: (v: boolean) => void;
  extension: Extension | null;
}) {
  const isEdit = Boolean(extension);
  const queryClient = useQueryClient();
  const { toast } = useToast();
  const [form, setForm] = React.useState<ExtensionInput>({
    number: '',
    name: '',
    callerId: '',
    enabled: true,
  });
  const [createdPassword, setCreatedPassword] = React.useState<string | null>(null);
  const [showPassword, setShowPassword] = React.useState(false);
  // Compara com o valor buscado do servidor para só mandar sipPassword no
  // update quando o operador realmente mudou o campo (evita re-provisionar
  // o PJSIP e gerar log de "senha alterada" à toa a cada salvar).
  const originalPasswordRef = React.useRef<string | undefined>(undefined);

  const passwordQuery = useQuery({
    queryKey: ['extension-password', extension?.id],
    queryFn: () => extensionsService.getPassword(extension!.id),
    enabled: open && isEdit && Boolean(extension),
  });

  React.useEffect(() => {
    if (open) {
      setCreatedPassword(null);
      setShowPassword(false);
      originalPasswordRef.current = undefined;
      setForm(
        extension
          ? {
              name: extension.name,
              callerId: extension.callerId ?? '',
              enabled: extension.enabled,
            }
          : { number: '', name: '', callerId: '', enabled: true },
      );
    }
  }, [open, extension]);

  React.useEffect(() => {
    if (passwordQuery.data) {
      originalPasswordRef.current = passwordQuery.data.sipPassword;
      setForm((f) => ({ ...f, sipPassword: passwordQuery.data.sipPassword }));
    }
  }, [passwordQuery.data]);

  const mutation = useMutation({
    mutationFn: () => {
      if (isEdit && extension) {
        const changedPassword =
          form.sipPassword && form.sipPassword !== originalPasswordRef.current
            ? form.sipPassword
            : undefined;
        return extensionsService.update(extension.id, { ...form, sipPassword: changedPassword });
      }
      return extensionsService.create(form);
    },
    onSuccess: (result) => {
      queryClient.invalidateQueries({ queryKey: ['extensions'] });
      queryClient.invalidateQueries({ queryKey: ['extension-password', extension?.id] });
      if (!isEdit && 'sipPassword' in result && result.sipPassword) {
        setCreatedPassword(result.sipPassword);
        toast({ title: 'Ramal criado', variant: 'success' });
      } else {
        toast({ title: 'Ramal salvo', variant: 'success' });
        onOpenChange(false);
      }
    },
    onError: (err) => toast({ title: 'Erro', description: errorMessage(err), variant: 'destructive' }),
  });

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent>
        <DialogHeader>
          <DialogTitle>{isEdit ? 'Editar ramal' : 'Novo ramal'}</DialogTitle>
        </DialogHeader>

        {createdPassword ? (
          <div className="flex flex-col gap-3">
            <p className="text-sm text-muted-foreground">
              Senha SIP gerada (exibida apenas uma vez, copie agora):
            </p>
            <div className="flex items-center gap-2 rounded-md border border-border bg-muted p-2 font-mono text-sm">
              <span className="flex-1 break-all">{createdPassword}</span>
              <Button
                size="icon"
                variant="ghost"
                onClick={() => navigator.clipboard.writeText(createdPassword)}
              >
                <Copy className="size-4" />
              </Button>
            </div>
            <DialogFooter>
              <Button onClick={() => onOpenChange(false)}>Fechar</Button>
            </DialogFooter>
          </div>
        ) : (
          <form
            onSubmit={(e) => {
              e.preventDefault();
              mutation.mutate();
            }}
            className="flex flex-col gap-4"
          >
            {!isEdit && (
              <div className="flex flex-col gap-1.5">
                <Label htmlFor="number">Número</Label>
                <Input
                  id="number"
                  required
                  value={form.number ?? ''}
                  onChange={(e) => setForm((f) => ({ ...f, number: e.target.value }))}
                />
              </div>
            )}
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="name">Nome</Label>
              <Input
                id="name"
                required
                value={form.name}
                onChange={(e) => setForm((f) => ({ ...f, name: e.target.value }))}
              />
            </div>
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="callerId">Caller ID</Label>
              <Input
                id="callerId"
                value={form.callerId ?? ''}
                onChange={(e) => setForm((f) => ({ ...f, callerId: e.target.value }))}
              />
            </div>
            {isEdit && (
              <div className="flex flex-col gap-1.5">
                <Label htmlFor="sipPassword">Senha SIP</Label>
                <div className="flex items-center gap-2">
                  <Input
                    id="sipPassword"
                    type={showPassword ? 'text' : 'password'}
                    className="font-mono"
                    value={form.sipPassword ?? ''}
                    placeholder={passwordQuery.isLoading ? 'Carregando...' : undefined}
                    onChange={(e) => setForm((f) => ({ ...f, sipPassword: e.target.value }))}
                  />
                  <Button
                    type="button"
                    size="icon"
                    variant="ghost"
                    onClick={() => setShowPassword((v) => !v)}
                  >
                    {showPassword ? <EyeOff className="size-4" /> : <Eye className="size-4" />}
                  </Button>
                  <Button
                    type="button"
                    size="icon"
                    variant="ghost"
                    onClick={() => form.sipPassword && navigator.clipboard.writeText(form.sipPassword)}
                  >
                    <Copy className="size-4" />
                  </Button>
                </div>
                <p className="text-xs text-muted-foreground">
                  Use isso para configurar o softphone. Editar aqui troca a senha de
                  verdade (reaplica no Asterisk ao salvar).
                </p>
              </div>
            )}
            <DialogFooter>
              <Button type="submit" loading={mutation.isPending}>
                Salvar
              </Button>
            </DialogFooter>
          </form>
        )}
      </DialogContent>
    </Dialog>
  );
}

function ResetPasswordDialog({
  result,
  onOpenChange,
}: {
  result: { number: string; password: string } | null;
  onOpenChange: (v: boolean) => void;
}) {
  return (
    <Dialog open={result !== null} onOpenChange={onOpenChange}>
      <DialogContent>
        <DialogHeader>
          <DialogTitle>Senha SIP redefinida — ramal {result?.number}</DialogTitle>
        </DialogHeader>
        <div className="flex flex-col gap-3">
          <p className="text-sm text-muted-foreground">
            Exibida apenas uma vez, copie agora:
          </p>
          <div className="flex items-center gap-2 rounded-md border border-border bg-muted p-2 font-mono text-sm">
            <span className="flex-1 break-all">{result?.password}</span>
            <Button
              size="icon"
              variant="ghost"
              onClick={() => result && navigator.clipboard.writeText(result.password)}
            >
              <Copy className="size-4" />
            </Button>
          </div>
        </div>
        <DialogFooter>
          <Button onClick={() => onOpenChange(false)}>Fechar</Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

function ExtensionsContent() {
  const { can } = useAuth();
  const { toast } = useToast();
  const queryClient = useQueryClient();
  const [search, setSearch] = React.useState('');
  const debouncedSearch = useDebounce(search);
  const [dialogOpen, setDialogOpen] = React.useState(false);
  const [editing, setEditing] = React.useState<Extension | null>(null);
  const [resetResult, setResetResult] = React.useState<{ number: string; password: string } | null>(
    null,
  );

  const { data, isLoading, isError, refetch } = useQuery({
    queryKey: ['extensions'],
    queryFn: extensionsService.list,
  });

  const resetPassword = useMutation({
    mutationFn: (id: string) => extensionsService.resetPassword(id),
    onSuccess: (result) => {
      queryClient.invalidateQueries({ queryKey: ['extensions'] });
      setResetResult({ number: result.number, password: result.sipPassword });
    },
    onError: (err) => toast({ title: 'Erro', description: errorMessage(err), variant: 'destructive' }),
  });

  const remove = useMutation({
    mutationFn: (id: string) => extensionsService.remove(id),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['extensions'] });
      toast({ title: 'Ramal removido', variant: 'success' });
    },
    onError: (err) => toast({ title: 'Erro', description: errorMessage(err), variant: 'destructive' }),
  });

  const filtered = (data ?? []).filter(
    (e) =>
      e.number.includes(debouncedSearch) ||
      e.name.toLowerCase().includes(debouncedSearch.toLowerCase()),
  );

  const columns: DataTableColumn<Extension>[] = [
    { key: 'number', header: 'Ramal', render: (r) => r.number },
    { key: 'name', header: 'Nome', render: (r) => r.name },
    { key: 'context', header: 'Contexto', render: (r) => r.context },
    {
      key: 'enabled',
      header: 'Status',
      render: (r) => (
        <Badge variant={r.enabled ? 'success' : 'secondary'}>
          {r.enabled ? 'Ativo' : 'Inativo'}
        </Badge>
      ),
    },
    { key: 'updatedAt', header: 'Atualizado em', render: (r) => formatDateTime(r.updatedAt) },
    {
      key: 'actions',
      header: '',
      className: 'text-right',
      render: (r) => (
        <div className="flex justify-end gap-1">
          {can('extensions.update') && (
            <>
              <Button
                size="icon"
                variant="ghost"
                onClick={() => {
                  setEditing(r);
                  setDialogOpen(true);
                }}
              >
                <Pencil className="size-4" />
              </Button>
              <Button
                size="icon"
                variant="ghost"
                onClick={() => {
                  if (confirm(`Redefinir a senha SIP do ramal ${r.number}?`)) {
                    resetPassword.mutate(r.id);
                  }
                }}
              >
                <KeyRound className="size-4" />
              </Button>
            </>
          )}
          {can('extensions.delete') && (
            <Button
              size="icon"
              variant="ghost"
              className="text-destructive"
              onClick={() => {
                if (confirm(`Remover o ramal ${r.number}?`)) remove.mutate(r.id);
              }}
            >
              <Trash2 className="size-4" />
            </Button>
          )}
        </div>
      ),
    },
  ];

  return (
    <>
      <PageHeader
        title="Ramais"
        description="Ramais SIP dos agentes (PJSIP)"
        actions={
          can('extensions.create') && (
            <Button
              onClick={() => {
                setEditing(null);
                setDialogOpen(true);
              }}
            >
              <Plus /> Novo ramal
            </Button>
          )
        }
      />
      <DataTable
        columns={columns}
        data={filtered}
        isLoading={isLoading}
        isError={isError}
        onRetry={() => refetch()}
        rowKey={(r) => r.id}
        searchValue={search}
        onSearchChange={setSearch}
        searchPlaceholder="Buscar por número ou nome..."
        emptyMessage="Nenhum ramal cadastrado."
      />
      <ExtensionFormDialog open={dialogOpen} onOpenChange={setDialogOpen} extension={editing} />
      <ResetPasswordDialog
        result={resetResult}
        onOpenChange={(v) => !v && setResetResult(null)}
      />
    </>
  );
}

export default function ExtensionsPage() {
  return (
    <RequirePermission permission="extensions.view">
      <ExtensionsContent />
    </RequirePermission>
  );
}