# -*- mode: python -*-
# -*- coding: utf-8 -*-

##############################################################################
#
# Gestion scolarite IUT
#
# Copyright (c) 1999 - 2023 Emmanuel Viennet.  All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#   Emmanuel Viennet      emmanuel.viennet@viennet.net
#
##############################################################################

"""Génération des bulletins de notes en format PDF

On peut installer plusieurs classes générant des bulletins de formats différents.
La préférence (par semestre) 'bul_pdf_class_name' conserve le nom de la classe Python
utilisée pour générer les bulletins en PDF. Elle doit être une sous-classe de PDFBulletinGenerator
et définir les méthodes fabriquant les éléments PDF:
 gen_part_title
 gen_table
 gen_part_below
 gen_signatures

Les éléments PDF sont des objets PLATYPUS de la bibliothèque Reportlab.
Voir la documentation (Reportlab's User Guide), chapitre 5 et suivants.

Pour définir un nouveau type de bulletin:
 - créer un fichier source sco_bulletins_pdf_xxxx.py où xxxx est le nom (court) de votre type;
 - dans ce fichier, sous-classer PDFBulletinGenerator ou PDFBulletinGeneratorDefault
    (s'inspirer de sco_bulletins_pdf_default);
 - en fin du fichier sco_bulletins_pdf.py, ajouter la ligne
    import sco_bulletins_pdf_xxxx
 - votre type sera alors (après redémarrage de ScoDoc) proposé dans le formulaire de paramètrage.

Chaque semestre peut si nécessaire utiliser un type de bulletin différent.

"""
import io
import pprint
import pydoc
import re
import time
import traceback

from flask import g, request

from app import log, ScoValueError
from app.models import FormSemestre, Identite
from app.scodoc import sco_cache
from app.scodoc import codes_cursus
from app.scodoc import sco_pdf
from app.scodoc import sco_preferences
from app.scodoc.sco_logos import find_logo
import app.scodoc.sco_utils as scu

import sco_version


def assemble_bulletins_pdf(
    formsemestre_id: int,
    story: list,
    bul_title: str,
    infos,
    pagesbookmarks=None,
    filigranne=None,
    server_name="",
):
    "Generate PDF document from a story (list of PLATYPUS objects)."
    if not story:
        return ""
    # Paramètres de mise en page
    margins = (
        sco_preferences.get_preference("left_margin", formsemestre_id),
        sco_preferences.get_preference("top_margin", formsemestre_id),
        sco_preferences.get_preference("right_margin", formsemestre_id),
        sco_preferences.get_preference("bottom_margin", formsemestre_id),
    )
    report = io.BytesIO()  # in-memory document, no disk file
    document = sco_pdf.BulletinDocTemplate(report)
    document.addPageTemplates(
        sco_pdf.ScoDocPageTemplate(
            document,
            author=f"{sco_version.SCONAME} {sco_version.SCOVERSION} (E. Viennet)",
            title=f"Bulletin {bul_title}",
            subject="Bulletin de note",
            server_name=server_name,
            margins=margins,
            pagesbookmarks=pagesbookmarks,
            filigranne=filigranne,
            preferences=sco_preferences.SemPreferences(formsemestre_id),
        )
    )
    document.multiBuild(story)
    data = report.getvalue()
    return data


def replacement_function(match):
    balise = match.group(1)
    name = match.group(3)
    logo = find_logo(logoname=name, dept_id=g.scodoc_dept_id)
    if logo is not None:
        return r'<img %s src="%s"%s/>' % (match.group(2), logo.filepath, match.group(4))
    raise ScoValueError(
        'balise "%s": logo "%s" introuvable'
        % (pydoc.html.escape(balise), pydoc.html.escape(name))
    )


class WrapDict(object):
    """Wrap a dict so that getitem returns '' when values are None
    and non existent keys returns an error message as value.
    """

    def __init__(self, adict, none_value=""):
        self.dict = adict
        self.none_value = none_value

    def __getitem__(self, key):
        try:
            value = self.dict[key]
        except KeyError:
            return f"XXX {key} invalide XXX"
        if value is None:
            return self.none_value
        return value


def process_field(
    field, cdict, style, suppress_empty_pars=False, fmt="pdf", field_name=None
):
    """Process a field given in preferences, returns
    - if fmt = 'pdf': a list of Platypus objects
    - if fmt = 'html' : a string

    Substitutes all %()s markup
    Remove potentialy harmful <img> tags
    Replaces <logo name="header" width="xxx" height="xxx">
    by <img src=".../logos/logo_header" width="xxx" height="xxx">

    If fmt = 'html', replaces <para> by <p>. HTML does not allow logos.
    """
    try:
        # None values are mapped to empty strings by WrapDict
        text = (field or "") % WrapDict(cdict)
    except KeyError as exc:
        missing_key = exc.args[0] if len(exc.args) > 0 else "?"
        log(
            f"""process_field: KeyError {missing_key} on field={field!r}
        values={pprint.pformat(cdict)}
        """
        )
        text = f"""<para><i>format invalide: champs</i> {missing_key} <i>inexistant !</i></para>"""
        scu.flash_once(
            f"Attention: format PDF invalide (champs {field}, clef {missing_key})"
        )
        raise
    except:  # pylint: disable=bare-except
        log(
            f"""process_field: invalid format. field={field!r}
        values={pprint.pformat(cdict)}
        """
        )
        # ne sera pas visible si lien vers pdf:
        scu.flash_once(f"Attention: format PDF invalide (champs {field})")
        text = (
            "<para><i>format invalide ! (1)</i></para><para>"
            + traceback.format_exc()
            + "</para>"
        )
    # remove unhandled or dangerous tags:
    text = re.sub(r"<\s*img", "", text)
    if fmt == "html":
        # convert <para>
        text = re.sub(r"<\s*para(\s*)(.*?)>", r"<p>", text)
        return text
    # --- PDF format:
    # handle logos:
    text = re.sub(
        r"<(\s*)logo(.*?)src\s*=\s*(.*?)>", r"<\1logo\2\3>", text
    )  # remove forbidden src attribute
    text = re.sub(
        r'(<\s*logo(.*?)name\s*=\s*"(\w*?)"(.*?)/?>)',
        replacement_function,
        text,
    )
    # nota: le match sur \w*? donne le nom du logo et interdit les .. et autres
    # tentatives d'acceder à d'autres fichiers !
    # la protection contre des noms malveillants est aussi assurée par l'utilisation de
    #        secure_filename dans la classe Logo

    # log('field: %s' % (text))
    return sco_pdf.make_paras(
        text, style, suppress_empty=suppress_empty_pars, field_name=field_name
    )


def get_formsemestre_bulletins_pdf(formsemestre_id, version="selectedevals"):
    "Document pdf avec tous les bulletins du semestre, et filename"
    from app.but import bulletin_but_court
    from app.scodoc import sco_bulletins

    formsemestre: FormSemestre = FormSemestre.query.get_or_404(formsemestre_id)
    versions = (
        scu.BULLETINS_VERSIONS_BUT
        if formsemestre.formation.is_apc()
        else scu.BULLETINS_VERSIONS
    )
    if version not in versions:
        raise ScoValueError("version de bulletin demandée invalide !")
    cached = sco_cache.SemBulletinsPDFCache.get(str(formsemestre_id) + "_" + version)
    if cached:
        return cached[1], cached[0]
    fragments = []
    # Make each bulletin

    for etud in formsemestre.get_inscrits(include_demdef=True, order=True):
        if version == "butcourt":
            frag = bulletin_but_court.bulletin_but_court_pdf_frag(etud, formsemestre)
        else:
            frag, _ = sco_bulletins.do_formsemestre_bulletinetud(
                formsemestre,
                etud,
                fmt="pdfpart",
                version=version,
            )
        fragments += frag
    #
    infos = {"DeptName": sco_preferences.get_preference("DeptName", formsemestre_id)}
    if request:
        server_name = request.url_root
    else:
        server_name = ""
    try:
        sco_pdf.PDFLOCK.acquire()
        pdfdoc = assemble_bulletins_pdf(
            formsemestre_id,
            fragments,
            formsemestre.titre_mois(),
            infos,
            server_name=server_name,
        )
    finally:
        sco_pdf.PDFLOCK.release()
    #
    date_iso = time.strftime("%Y-%m-%d")
    filename = "bul-%s-%s.pdf" % (formsemestre.titre_num(), date_iso)
    filename = scu.unescape_html(filename).replace(" ", "_").replace("&", "")
    # fill cache
    sco_cache.SemBulletinsPDFCache.set(
        str(formsemestre_id) + "_" + version, (filename, pdfdoc)
    )
    return pdfdoc, filename


def get_etud_bulletins_pdf(etudid, version="selectedevals"):
    "Bulletins pdf de tous les semestres de l'étudiant, et filename"
    from app.scodoc import sco_bulletins

    etud = Identite.get_etud(etudid)
    fragments = []
    bookmarks = {}
    filigrannes = {}
    i = 1
    for formsemestre in etud.get_formsemestres():
        frag, filigranne = sco_bulletins.do_formsemestre_bulletinetud(
            formsemestre,
            etud,
            fmt="pdfpart",
            version=version,
        )
        fragments += frag
        filigrannes[i] = filigranne
        bookmarks[i] = formsemestre.session_id()  # eg RT-DUT-FI-S1-2015
        i = i + 1
    infos = {"DeptName": sco_preferences.get_preference("DeptName")}
    if request:
        server_name = request.url_root
    else:
        server_name = ""
    try:
        sco_pdf.PDFLOCK.acquire()
        pdfdoc = assemble_bulletins_pdf(
            None,
            fragments,
            etud.nomprenom,
            infos,
            bookmarks,
            filigranne=filigrannes,
            server_name=server_name,
        )
    finally:
        sco_pdf.PDFLOCK.release()
    #
    filename = f"bul-{etud.nomprenom}"
    filename = (
        scu.unescape_html(filename).replace(" ", "_").replace("&", "").replace(".", "")
        + ".pdf"
    )

    return pdfdoc, filename


def get_filigranne(etud_etat: str, prefs, decision_sem=None) -> str:
    """Texte à placer en "filigranne" sur le bulletin pdf"""
    if etud_etat == scu.DEMISSION:
        return "Démission"
    elif etud_etat == codes_cursus.DEF:
        return "Défaillant"
    elif (prefs["bul_show_temporary"] and not decision_sem) or prefs[
        "bul_show_temporary_forced"
    ]:
        return prefs["bul_temporary_txt"]
    return ""