import os
import shutil
import sys

from django.conf import settings
from django.core.management.base import BaseCommand
from django.template.loader import get_template
from django.utils import translation

from judge.models import Problem, ProblemTranslation
from judge.pdf_problems import (
    DefaultPdfMaker,
    PhantomJSPdfMaker,
    PuppeteerPDFRender,
    SeleniumPDFRender,
    SlimerJSPdfMaker,
)


class Command(BaseCommand):
    help = "renders a PDF file of a problem"

    def add_arguments(self, parser):
        parser.add_argument("code", help="code of problem to render")
        parser.add_argument(
            "directory", nargs="?", help="directory to store temporaries"
        )
        parser.add_argument(
            "-l",
            "--language",
            default=settings.LANGUAGE_CODE,
            help="language to render PDF in",
        )
        parser.add_argument(
            "-p",
            "--phantomjs",
            action="store_const",
            const=PhantomJSPdfMaker,
            default=DefaultPdfMaker,
            dest="engine",
        )
        parser.add_argument(
            "-s",
            "--slimerjs",
            action="store_const",
            const=SlimerJSPdfMaker,
            dest="engine",
        )
        parser.add_argument(
            "-c",
            "--chrome",
            "--puppeteer",
            action="store_const",
            const=PuppeteerPDFRender,
            dest="engine",
        )
        parser.add_argument(
            "-S",
            "--selenium",
            action="store_const",
            const=SeleniumPDFRender,
            dest="engine",
        )

    def handle(self, *args, **options):
        try:
            problem = Problem.objects.get(code=options["code"])
        except Problem.DoesNotExist:
            print("Bad problem code")
            return

        try:
            trans = problem.translations.get(language=options["language"])
        except ProblemTranslation.DoesNotExist:
            trans = None

        directory = options["directory"]
        with options["engine"](
            directory, clean_up=directory is None
        ) as maker, translation.override(options["language"]):
            problem_name = problem.name if trans is None else trans.name
            maker.html = (
                get_template("problem/raw.html")
                .render(
                    {
                        "problem": problem,
                        "problem_name": problem_name,
                        "description": problem.description
                        if trans is None
                        else trans.description,
                        "url": "",
                        "math_engine": maker.math_engine,
                    }
                )
                .replace('"//', '"https://')
                .replace("'//", "'https://")
            )
            maker.title = problem_name
            for file in ("style.css", "pygment-github.css", "mathjax3_config.js"):
                maker.load(file, os.path.join(settings.DMOJ_RESOURCES, file))
            maker.make(debug=True)
            if not maker.success:
                print(maker.log, file=sys.stderr)
            elif directory is None:
                shutil.move(maker.pdffile, problem.code + ".pdf")