#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2020 SkyWater PDK Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0

import sys
import argparse
from pathlib import Path
import pandas as pd
import errno
from jinja2 import Template


resources_rst_template = """Further Resources
=================


News Articles
-------------

{% for _, row in news_articles.iterrows() -%}
* `{{ row["Article"] }} <{{ row["Link"] }}>`__
{% endfor %}

Conferences
-----------
{% for _, row in conferences.iterrows() -%}

{% if row["Conference"] %}
{{ row["Conference"] }}
{{ '~' * row["Conference"]|length }}

{% endif -%}
{% if row["Description"] -%}
{{ row["Description"] }}
    
{% endif -%}
{% if row["Related link"] -%}
* `{{ row["Related link"] }} <{{ row["Related link"] }}>`__
{% endif -%}
{% endfor %}

Talk Series
-----------
{% for _, row in talk_series.iterrows() -%}
{% if row["Talk series"] %}
{{ row["Talk series"] }}
{{ '~' * row["Talk series"]|length }}
{% if row["Description"] %}
{{ row["Description"] }}
{% endif -%}
{% if row["Page"] %}
**Page**: {{ row["Page"] }}
{% endif -%}
{% endif %}
{{ row["Title"] }}
{{ '^' * row["Title"]|length }}

{% if row["Presenter"] -%}
**Presenter**: {{ row["Presenter"] }}
{% endif -%}
{% if row["Talk details"] -%}
**Details**: {{ row["Talk details"] }}
{% endif -%}
{% if row["Video link"] -%}
{% if row["Video"] -%}
**Video**: `{{ row["Video"] }} <{{ row["Video link"] }}>`__
{% else -%}
**Video**: `{{ row["Video link"] }} <{{ row["Video link"] }}>`__
{% endif -%}
{% endif -%}
{% if row["Slides PPTX link"] -%}
{% if row["Slides PPTX"] -%}
**Video**: `{{ row["Slides PPTX"] }} <{{ row["Slides PPTX link"] }}>`__
{% else -%}
**Video**: `{{ row["Slides PPTX link"] }} <{{ row["Slides PPTX link"] }}>`__
{% endif -%}
{% endif -%}
{% if row["Slides PDF link"] -%}
{% if row["Slides PDF"] -%}
**Video**: `{{ row["Slides PDF"] }} <{{ row["Slides PDF link"] }}>`__
{% else -%}
**Video**: `{{ row["Slides PDF link"] }} <{{ row["Slides PDF link"] }}>`__
{% endif -%}
{% endif -%}
{% endfor %}

LinkedIn Posts
--------------

{% for _, row in linkedin.iterrows() -%}
* `{{ row["Title"] }} <{{ row["Link"] }}>`__
{% endfor %}

Courses
-------

{% for _, row in courses.iterrows() -%}
{% if row["Courses"] %}
{{ row["Courses"] }}
{{ '~' * row["Courses"]|length }}
{% endif -%}
{% if row["Link"] -%}
{% if row["Link title"] -%}
* `{{ row["Link title"] }} <{{ row["Link"] }}>`__
{% else -%}
* `{{ row["Link"] }} <{{ row["Link"] }}>`__
{% endif -%}
{% endif -%}
{% endfor %}
"""


def parse_entries(filepath, sheet_name, cols=None):
    """
    Loads resources from spreadsheet to pandas frames.

    Parameters
    ----------
    filepath:
        path or URL to spreadsheet file (ODS requires odfpy package, XLSX
        requires xlrd package)
    sheet_name: name of the sheet to extract data from
    cols: range of columns to extract from the sheet
    """
    values = pd.read_excel(
        filepath,
        sheet_name=sheet_name,
        header=0,
        usecols=cols
    )
    values = values.where(values.notnull(), None)
    return values


def main(argv):
    parser = argparse.ArgumentParser(prog=argv[0])
    parser.add_argument(
        'output',
        help='The path to output RST file',
        type=Path
    )
    parser.add_argument(
        '--spreadsheet-file',
        help='The path to input spreadsheet file',
        type=Path
    )
    parser.add_argument(
        '--google-spreadsheet-id',
        help='Google Spreadsheet ID of the document to process',
        action='store_true'
    )

    args = parser.parse_args(argv[1:])

    input_file = None
    if args.spreadsheet_file:
        input_file = args.spreadsheet_file
    if args.google_spreadsheet_id:
        input_file = f'https://docs.google.com/spreadsheets/d/{args.google_spreadsheet_id}/export?format=ods'  # noqa: E501

    if input_file is None:
        print('Input file is not provided')
        return errno.ENOENT

    news_articles = parse_entries(input_file, 'News Articles')
    talk_series = parse_entries(input_file, 'Talk Series')
    conferences = parse_entries(input_file, 'Conferences')
    linkedin = parse_entries(input_file, 'LinkedIn Posts')
    courses = parse_entries(input_file, 'Courses')

    tm = Template(resources_rst_template)
    resources_rst_content = tm.render(
        news_articles=news_articles,
        talk_series=talk_series,
        conferences=conferences,
        linkedin=linkedin,
        courses=courses
    )

    with open(args.output, 'w') as out:
        out.write(resources_rst_content)

    return 0


if __name__ == '__main__':
    sys.exit(main(sys.argv))