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import json

from .file_util import _stringify_path, is_file_like


def load_template(path_or_buffer):
    """Build tabula-py option from template file

    Args:
        path_or_buffer (str, path object or file-like object):
            File like object of Tabula app template.

    Returns:
        dict: tabula-py options
    """

    from itertools import groupby
    from operator import itemgetter

    path_or_buffer = _stringify_path(path_or_buffer)

    if is_file_like(path_or_buffer):
        templates = json.load(path_or_buffer)
    else:
        with open(path_or_buffer, "r") as f:
            templates = json.load(f)

    options = []

    grouper = itemgetter("page", "extraction_method")

    for key, grp in groupby(sorted(templates, key=grouper), grouper):
        tmp_options = [_convert_template_option(e) for e in grp]

        if len(tmp_options) == 1:
            options.append(tmp_options[0])
            continue

        option = tmp_options[0]
        areas = [e.get("area") for e in tmp_options]
        option["area"] = areas
        option["multiple_tables"] = True
        options.append(option)

    return options


def _convert_template_option(template):
    """Convert Tabula app template to tabula-py option

    Args:
        template (dict): Tabula app template

    Returns:
        `obj`:dict: tabula-py option
    """

    option = {}
    extraction_method = template.get("extraction_method")
    if extraction_method == "guess":
        option["guess"] = True
    elif extraction_method == "lattice":
        option["lattice"] = True
    elif extraction_method == "stream":
        option["stream"] = True

    option["pages"] = template.get("page")
    option["area"] = [
        round(template["y1"], 3),
        round(template["x1"], 3),
        round(template["y2"], 3),
        round(template["x2"], 3),
    ]

    return option