import { Button } from '@/components/ui/button';
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form';
import { Input } from '@/components/ui/input';
import { UserAvatar } from '@/components/user-avatar';
import { apiClient } from '@/lib/api-client';
import { useAuth } from '@/lib/auth';
import { zodResolver } from '@hookform/resolvers/zod';
import type { UserProfileResponse } from '@repo/api-contract';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { Link } from '@tanstack/react-router';
import { useEffect } from 'react';
import { useForm } from 'react-hook-form';
import { z } from 'zod';

const updateProfileSchema = z.object({
  fullName: z.string().min(1, 'El nombre es requerido'),
});

const updatePasswordSchema = z
  .object({
    currentPassword: z.string().min(1, 'La contraseña actual es requerida'),
    newPassword: z.string().min(6, 'La nueva contraseña debe tener al menos 6 caracteres'),
    confirmPassword: z.string().min(1, 'La confirmación de contraseña es requerida'),
  })
  .refine((data) => data.newPassword === data.confirmPassword, {
    message: 'Las contraseñas no coinciden',
    path: ['confirmPassword'],
  });

type UpdateProfileForm = z.infer<typeof updateProfileSchema>;
type UpdatePasswordForm = z.infer<typeof updatePasswordSchema>;

export function ProfilePage() {
  const { user, displayName, avatarUrl, isAuthenticated, updateProfile, updatePassword } =
    useAuth();
  const queryClient = useQueryClient();
  const profileQuery = useQuery({
    queryKey: ['user-profile'],
    enabled: isAuthenticated,
    queryFn: (): Promise<UserProfileResponse> => apiClient.user.getProfile(),
  });

  const updateProfileForm = useForm<UpdateProfileForm>({
    resolver: zodResolver(updateProfileSchema),
    defaultValues: {
      fullName: displayName,
    },
  });

  const updatePasswordForm = useForm<UpdatePasswordForm>({
    resolver: zodResolver(updatePasswordSchema),
    defaultValues: {
      currentPassword: '',
      newPassword: '',
      confirmPassword: '',
    },
  });

  // Sync form with displayName when session data is loaded or updated elsewhere
  useEffect(() => {
    if (displayName && !updateProfileForm.formState.isDirty) {
      updateProfileForm.reset({ fullName: displayName });
    }
  }, [displayName, updateProfileForm]);

  const updateProfileMutation = useMutation({
    mutationFn: updateProfile,
    onSuccess: (_, variables) => {
      queryClient.invalidateQueries({ queryKey: ['user-profile'] });
      updateProfileForm.reset({ fullName: variables.fullName });
    },
  });

  const updatePasswordMutation = useMutation({
    mutationFn: async (data: UpdatePasswordForm) => {
      await updatePassword({
        currentPassword: data.currentPassword,
        password: data.newPassword,
      });
    },
    onSuccess: () => {
      updatePasswordForm.reset();
    },
  });

  const onUpdateProfile = (data: UpdateProfileForm) => {
    updateProfileMutation.mutate(data);
  };

  const onUpdatePassword = (data: UpdatePasswordForm) => {
    updatePasswordMutation.mutate(data);
  };

  if (!isAuthenticated) {
    return (
      <main className="mx-auto flex min-h-[60vh] w-full max-w-6xl items-center justify-center px-6">
        <section className="w-full max-w-3xl rounded-xl border bg-card p-6 text-card-foreground shadow-sm">
          <h1 className="text-2xl font-semibold">Perfil</h1>
          <p className="mt-2 text-sm text-muted-foreground">
            Necesitás iniciar sesión para ver tu perfil.
          </p>
          <Button asChild className="mt-4">
            <Link to="/login">Ir a Login</Link>
          </Button>
        </section>
      </main>
    );
  }

  return (
    <main className="mx-auto flex min-h-[60vh] w-full max-w-6xl items-center justify-center px-6 py-8">
      <div className="w-full max-w-3xl space-y-6">
        <section className="rounded-xl border bg-card p-6 text-card-foreground shadow-sm">
          <div className="flex items-center gap-3">
            <UserAvatar
              src={profileQuery.data?.avatarUrl ?? avatarUrl}
              alt={displayName}
              fallbackText={displayName}
              size="lg"
            />
            <div>
              <h1 className="text-2xl font-semibold">{displayName}</h1>
              <p className="text-sm text-muted-foreground">
                {profileQuery.data?.email ?? user?.email}
              </p>
              {profileQuery.data?.role && (
                <p className="text-sm text-muted-foreground">Rol: {profileQuery.data.role}</p>
              )}
            </div>
          </div>

          {profileQuery.isLoading && (
            <p className="mt-4 text-sm text-muted-foreground">Cargando perfil...</p>
          )}

          {profileQuery.isError && (
            <p className="mt-4 text-sm text-destructive">
              No se pudo cargar el perfil desde el backend.
            </p>
          )}
        </section>

        <section className="rounded-xl border bg-card p-6 text-card-foreground shadow-sm">
          <h2 className="text-xl font-semibold mb-4">Editar Perfil</h2>
          <Form {...updateProfileForm}>
            <form onSubmit={updateProfileForm.handleSubmit(onUpdateProfile)} className="space-y-4">
              <FormField
                control={updateProfileForm.control}
                name="fullName"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Nombre completo</FormLabel>
                    <FormControl>
                      <Input {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <Button type="submit" disabled={updateProfileMutation.isPending}>
                {updateProfileMutation.isPending ? 'Guardando...' : 'Guardar cambios'}
              </Button>
            </form>
          </Form>
          {updateProfileMutation.isError && (
            <p className="mt-4 text-sm text-destructive">
              Error al actualizar el perfil: {updateProfileMutation.error?.message}
            </p>
          )}
          {updateProfileMutation.isSuccess && (
            <p className="mt-4 text-sm text-green-600">Perfil actualizado exitosamente.</p>
          )}
        </section>

        <section className="rounded-xl border bg-card p-6 text-card-foreground shadow-sm">
          <h2 className="text-xl font-semibold mb-4">Cambiar Contraseña</h2>
          <Form {...updatePasswordForm}>
            <form
              onSubmit={updatePasswordForm.handleSubmit(onUpdatePassword)}
              className="space-y-4"
            >
              <FormField
                control={updatePasswordForm.control}
                name="currentPassword"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Contraseña actual</FormLabel>
                    <FormControl>
                      <Input type="password" {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={updatePasswordForm.control}
                name="newPassword"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Nueva contraseña</FormLabel>
                    <FormControl>
                      <Input type="password" {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={updatePasswordForm.control}
                name="confirmPassword"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Confirmar nueva contraseña</FormLabel>
                    <FormControl>
                      <Input type="password" {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <Button type="submit" disabled={updatePasswordMutation.isPending}>
                {updatePasswordMutation.isPending ? 'Cambiando...' : 'Cambiar contraseña'}
              </Button>
            </form>
          </Form>
          {updatePasswordMutation.isError && (
            <p className="mt-4 text-sm text-destructive">
              Error al cambiar la contraseña: {updatePasswordMutation.error?.message}
            </p>
          )}
          {updatePasswordMutation.isSuccess && (
            <p className="mt-4 text-sm text-green-600">Contraseña cambiada exitosamente.</p>
          )}
        </section>
      </div>
    </main>
  );
}