Prepare model data for the packages table model.

def _prepare_model_data(packages, linked, pip=None,
                            private_packages=None):
        """Prepare model data for the packages table model."""
        pip = pip if pip else []
        private_packages = private_packages if private_packages else {}

        data = []

        if private_packages is not None:
            for pkg in private_packages:
                if pkg in packages:
                    p_data = packages.get(pkg)
                    versions = p_data.get('versions', '') if p_data else []
                    private_versions = private_packages[pkg]['versions']
                    all_versions = sort_versions(list(set(versions +
                                                          private_versions)))
                    packages[pkg]['versions'] = all_versions
                else:
                    private_versions = sort_versions(
                        private_packages[pkg]['versions'])
                    private_packages[pkg]['versions'] = private_versions
                    packages[pkg] = private_packages[pkg]
        else:
            private_packages = {}

        linked_packages = {}
        for canonical_name in linked:
            name, version, b = tuple(canonical_name.rsplit('-', 2))
            linked_packages[name] = {'version': version}

        pip_packages = {}
        for canonical_name in pip:
            name, version, b = tuple(canonical_name.rsplit('-', 2))
            pip_packages[name] = {'version': version}

        packages_names = sorted(list(set(list(linked_packages.keys()) +
                                         list(pip_packages.keys()) +
                                         list(packages.keys()) +
                                         list(private_packages.keys())
                                         )
                                     )
                                )

        for name in packages_names:
            p_data = packages.get(name)

            summary = p_data.get('summary', '') if p_data else ''
            url = p_data.get('home', '') if p_data else ''
            license_ = p_data.get('license', '') if p_data else ''
            versions = p_data.get('versions', '') if p_data else []
            version = p_data.get('latest_version', '') if p_data else ''

            if name in pip_packages:
                type_ = C.PIP_PACKAGE
                version = pip_packages[name].get('version', '')
                status = C.INSTALLED
            elif name in linked_packages:
                type_ = C.CONDA_PACKAGE
                version = linked_packages[name].get('version', '')
                status = C.INSTALLED

                if version in versions:
                    vers = versions
                    upgradable = not version == vers[-1] and len(vers) != 1
                    downgradable = not version == vers[0] and len(vers) != 1

                    if upgradable and downgradable:
                        status = C.MIXGRADABLE
                    elif upgradable:
                        status = C.UPGRADABLE
                    elif downgradable:
                        status = C.DOWNGRADABLE
            else:
                type_ = C.CONDA_PACKAGE
                status = C.NOT_INSTALLED

                if version == '' and len(versions) != 0:
                    version = versions[-1]

            row = {C.COL_ACTION: C.ACTION_NONE,
                   C.COL_PACKAGE_TYPE: type_,
                   C.COL_NAME: name,
                   C.COL_DESCRIPTION: summary.capitalize(),
                   C.COL_VERSION: version,
                   C.COL_STATUS: status,
                   C.COL_URL: url,
                   C.COL_LICENSE: license_,
                   C.COL_INSTALL: False,
                   C.COL_REMOVE: False,
                   C.COL_UPGRADE: False,
                   C.COL_DOWNGRADE: False,
                   C.COL_ACTION_VERSION: None
                   }

            data.append(row)
        return data