#!/usr/bin/env python
# encoding: utf-8

"""
Producing then compiling templates
"""

import csv
import os
import logging

from pathlib import Path
import pytex
from mapytex import Expression, Integer, Decimal
import bopytex.filters as filters

formatter = logging.Formatter("%(name)s :: %(levelname)s :: %(message)s")
steam_handler = logging.StreamHandler()
steam_handler.setLevel(logging.DEBUG)
steam_handler.setFormatter(formatter)
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
logger.addHandler(steam_handler)


def setup():
    Expression.set_render("tex")
    logger.debug(f"Render for Expression is {Expression.RENDER}")
    mapytex_tools = {
        "Expression": Expression,
        "Integer": Integer,
        "Decimal": Decimal,
        # "Polynom": mapytex.Polynom,
        # "Fraction": mapytex.Fraction,
        # "Equation": mapytex.Equation,
        # "random_str": mapytex.random_str,
        # "random_pythagore": mapytex.random_pythagore,
        # "Dataset": mapytex.Dataset,
        # "WeightedDataset": mapytex.WeightedDataset,
    }
    pytex.update_export_dict(mapytex_tools)

    pytex.add_filter("calculus", filters.do_calculus)


def get_working_dir(options):
    """ Get the working directory """
    if options["working_dir"]:
        working_dir = Path(options["working_dir"])
    else:
        try:
            template = Path(options["template"])
        except TypeError:
            raise ValueError(
                "Need to set the working directory \
                    or to give a template"
            )
        else:
            working_dir = template.parent
    logger.debug(f"The output directory will be {working_dir}")
    return working_dir


def activate_printanswers(
    texfile, noans=r"solution/print = false", ans=r"solution/print = true"
):
    """ Activate printanswers mod in texfile """
    output_fname = "corr_" + texfile
    with open(texfile, "r") as input_f:
        with open(output_fname, "w") as output_f:
            for line in input_f.readlines():
                output_f.write(line.replace(noans, ans))
    return output_fname


def deactivate_printanswers(corr_fname):
    """ Activate printanswers mod in texfile """
    Path(corr_fname).remove()


def pdfjoin(pdf_files, destname, working_dir=".", rm_pdfs=1):
    """TODO: Docstring for pdfjoin.

    :param pdf_files: list of pdf files to join
    :param destname: name for joined pdf
    :param working_dir: the working directory
    :param rm_pdfs: Remove pdf_files after joining them
    :returns: TODO

    """
    joined_pdfs = Path(working_dir) / Path(destname)
    pdf_files_str = " ".join(pdf_files)
    pdfjam = f"pdfjam {pdf_files_str} -o {joined_pdfs}"
    logger.debug(f"Run {pdfjam}")
    logger.info("Joining pdf files")
    os.system(pdfjam)
    if rm_pdfs:
        logger.info(f"Remove {pdf_files_str}")
        os.system(f"rm {pdf_files_str}")


def extract_student_csv(csv_filename):
    """ Extract student list from csv_filename 

    Student identifier is got in the column "Élève".

    """
    with open(csv_filename, "r") as csvfile:
        reader = csv.DictReader(csvfile)
        return [r["Élève"] for r in reader]


def produce_and_compile(options):
    """ Produce and compile subjects
    """
    working_dir = get_working_dir(options)

    if options["only_corr"]:
        options["corr"] = True
        tex_files = working_dir.glop("[0-9]*_*.tex")
    else:
        template = Path(options["template"]).name
        logger.debug(f"Template will be {template}")

        if options["students_csv"]:
            list_infos = [
                {"num": f"{i+1:02d}", "name": s}
                for (i, s) in enumerate(extract_student_csv(options["students_csv"]))
            ]
        else:
            list_infos = [
                {"num": f"{i+1:02d}"} for i in range(options["number_subjects"])
            ]

        tex_files = []
        for infos in list_infos:
            dest = working_dir / Path(template.replace("tpl", infos["num"]))
            logger.debug(f"Feeding template toward {dest}")
            tex_files.append(dest)
            if options["crazy"]:
                while True:
                    try:
                        pytex.feed(
                            working_dir / template,
                            {"infos": infos},
                            output=dest,
                            force=1,
                        )
                    except:
                        pass
                    else:
                        break
            else:
                pytex.feed(
                    working_dir / template, {"infos": infos}, output=dest, force=1
                )
            logger.debug(f"{dest} fed")

        if not options["no_compile"]:
            pdf_files = []
            for texfile in tex_files:
                logger.debug(f"Start compiling {texfile}")
                pytex.pdflatex(texfile)
                logger.debug(f"End compiling {texfile}")
                pdf_files.append(str(texfile).split('.')[0] + ".pdf")
            logger.debug(f"Compiled files : {pdf_files}")

        if not options["no_join"] and not options["no_compile"]:
            pdfjoin(
                pdf_files,
                template.replace("tpl", "all").replace(".tex", ".pdf"),
                working_dir,
                rm_pdfs=1,
            )

    if options["corr"]:
        pdf_files = []
        for texfile in tex_files:
            corr_fname = activate_printanswers(texfile)
            if not options["no_compile"]:
                logger.debug(f"Start compiling {texfile}")
                pytex.pdflatex(corr_fname)
                logger.debug(f"End compiling {texfile}")
                pdf_files.append(str(corr_fname).split(".")[0] + ".pdf")
                deactivate_printanswers(corr_fname)

        if not options["no_join"] and not options["no_compile"]:
            pdfjoin(
                pdf_files,
                template.replace("tpl", "corr").replace(".tex", ".pdf"),
                working_dir,
                rm_pdfs=1,
            )

    if not options["dirty"]:
        pytex.clean(working_dir)


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