#!/usr/bin/env python3

import argparse
import calendar
import logging
import os
import subprocess
import sys

import jinja2


def main():
    env = jinja2.Environment()
    loader = jinja2.FileSystemLoader('templates')
    template_verso = loader.load(env, 'week_on_two_pages-A6-v.svg')
    template_recto = loader.load(env, 'week_on_two_pages-A6-r.svg')

    os.makedirs("build", exist_ok=True)

    year = 2022

    cal = calendar.Calendar()
    weeks = sum([r[0] for r in cal.yeardatescalendar(2022, width=1)], [])

    last_monday = None
    page = 1
    for week in weeks:
        # yeardatescalendar will have the same week twice at the margin
        # of a month, but we want to skip one of those
        if week[0] == last_monday:
            continue
        last_monday = week[0]

        with open("build/week_on_two_pages-A6-{year}-{page:03}.svg".format(
            year=year,
            page=page,
        ), 'w') as fp:
            fp.write(template_verso.render(week=week))
        page += 1

        with open("build/week_on_two_pages-A6-{year}-{page:03}.svg".format(
            year=year,
            page=page,
        ), 'w') as fp:
            fp.write(template_recto.render(week=week))
        page += 1

    inkscape_commands = ";\n".join([
        (
            "file-open:build/{svg};"
            + " export-type: pdf;"
            + " export-filename:build/{pdf};"
            + " export-text-to-path;"
            + " export-do"
        ).format(
            svg = s,
            pdf = os.path.splitext(s)[0] + ".pdf",
        )
        for s in os.listdir("build")
    ])
    try:
        subprocess.run(
            ["inkscape", "--shell" ],
            input=inkscape_commands,
            text=True,
        )
    except FileNotFoundError:
        logging.warning("Inkscape is not installed, can't convert to pdf")
        logging.warning("Stopping here, you can use the svgs as you like")
        sys.exit(1)

    pdf_pages = sorted([
        os.path.join("build", p)
        for p in os.listdir("build")
        if p.endswith(".pdf")
    ])
    try:
        subprocess.run([
            "pdfjam",
            "--outfile", "weekly_planner_A6.pdf",
            *pdf_pages
        ])
    except FileNotFoundError:
        logging.warning("pdfjam is not installed")
        logging.warning("you will have to join the pdf pages yourself")
        sys.exit(1)


if __name__ == '__main__':
    main()