#!/usr/bin/env python3

import argparse
import datetime
import locale
import logging
import os
import subprocess
import sys

import jinja2


locale.setlocale(locale.LC_ALL, '')


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

    destination_fname = "build/daily-A6-{year}-{page:03}.svg"

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

    year = 2022

    template_cover = loader.load(env, 'cover-A6-r.svg')
    with open(destination_fname.format(
        year=year,
        page=0,
    ), 'w') as fp:
        fp.write(template_cover.render(year=year))

    day = datetime.date(year, 1, 1)

    page = 1
    while day.year == year:
        with open(destination_fname.format(
            year=year,
            page=page,
        ), 'w') as fp:
            fp.write(template_verso.render(day=day))
        page += 1
        day += datetime.timedelta(days=1)

        if day.year > year:
            break

        with open(destination_fname.format(
            year=year,
            page=page,
        ), 'w') as fp:
            fp.write(template_recto.render(day=day))
        page += 1
        day += datetime.timedelta(days=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")
    ])
    # insert an empty page on the second page, to start the year on a
    # left page
    pdf_pages.insert(1, "1, {}")
    try:
        subprocess.run([
            "pdfjam",
            "--outfile", "daily_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()