# coding: utf-8

# Copyright 2014-2025 Álvaro Justen <https://github.com/turicas/rows/>
#    This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General
#    Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option)
#    any later version.
#    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
#    warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
#    more details.
#    You should have received a copy of the GNU Lesser General Public License along with this program.  If not, see
#    <http://www.gnu.org/licenses/>.

from __future__ import unicode_literals

from rows.compat import DEFAULT_SAMPLE_ROWS

def import_from_dicts(data, samples=DEFAULT_SAMPLE_ROWS, *args, **kwargs):
    """Import data from a iterable of dicts

    The algorithm will use the `samples` first `dict`s to determine the field
    names (if `samples` is `None` all `dict`s will be used).
    """
    from itertools import chain

    from rows.plugins.utils import create_table

    data = iter(data)

    cached_rows, headers = [], []
    for index, row in enumerate(data, start=1):
        cached_rows.append(row)

        for key in row.keys():
            if key not in headers:
                headers.append(key)

        if samples and index == samples:
            break

    data_rows = (
        [row.get(header, None) for header in headers]
        for row in chain(cached_rows, data)
    )

    kwargs["samples"] = samples
    meta = {"imported_from": "dicts"}
    return create_table(chain([headers], data_rows), meta=meta, *args, **kwargs)


def export_to_dicts(table, *args, **kwargs):
    """Export a `rows.Table` to a list of dicts"""
    field_names = table.field_names
    return [{key: getattr(row, key) for key in field_names} for row in table]
