import argparse
import locale
from pathlib import Path
from datetime import datetime, timedelta

MONDAY = 0  # 0 = Monday, 1=Tuesday, 2=Wednesday...


def get_next_weekday(d, weekday):
    days_ahead = weekday - d.weekday()
    if days_ahead <= 0:  # Target day already happened this week
        days_ahead += 7
    return d + timedelta(days_ahead)


def set_publication_date_for_humans(text: str, publication_date: datetime) -> str:
    locale.setlocale(locale.LC_TIME, "fr_FR")
    date = publication_date.strftime("%d %B %Y")
    return text.replace("{DATE}", date)


def set_publication_date_for_pelican(text: str, publication_date: datetime) -> str:
    date_digits = publication_date.isoformat()[0:10]
    return text.replace("{DATE_DIGITS}", date_digits)


def set_publication_date_for_seo(text: str, publication_date: datetime) -> str:
    locale.setlocale(locale.LC_TIME, "en_US")
    date_utc = publication_date.strftime("%a %b %d %Y")
    return text.replace("{DATE_UTC}", date_utc)


# Parse the command line arguments
parser = argparse.ArgumentParser()
parser.add_argument("-n", "--number", required=True, type=int, help="Newsletter number")
args = parser.parse_args()

# Load the newsletter template
template = Path("./template/newsletter.md")
content = template.read_text()


new_content = content.replace("{LETTER_NUMBER}", str(args.number))

today = datetime.today()
next_monday = get_next_weekday(today, MONDAY)

new_content = set_publication_date_for_humans(new_content, next_monday)

new_content = set_publication_date_for_pelican(new_content, next_monday)

new_content = set_publication_date_for_seo(new_content, next_monday)

# Create the new file
destination = Path(f"./content/newsletter/craft-letter-{args.number}.md")
destination.write_text(new_content)

# Load the homepage template
template = Path("./template/index.md")
content = template.read_text()

new_content = set_publication_date_for_pelican(content, next_monday)

new_content = set_publication_date_for_seo(new_content, next_monday)

link = (
    f"[lettre n°{args.number}]({{filename}}/newsletter/craft-letter-{args.number}.md)"
)
new_content = new_content.replace("{LINK}", link)

for i in reversed(range(args.number)):
    link = f"* [Lettre n°{i + 1}]({{filename}}/newsletter/craft-letter-{i + 1}.md)\n"
    new_content += link

# Update the index page
destination = Path("./content/pages/index.md")
destination.write_text(new_content)