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

##############################################################################
#
# Gestion scolarite IUT
#
# Copyright (c) 1999 - 2021 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
#
##############################################################################

"""Dump base de données pour debug et support technique

Le principe est le suivant:
 1- S'il existe une base en cours d'anonymisation, s'arrête et affiche un msg d'erreur l'utilisateur,
    qui peut décider de la supprimer.

 2- ScoDoc lance un script qui duplique la base (la copie de SCORT devient ANORT)
     -  (si elle existe deja, s'arrête)
createdb -E UTF-8 ANORT
pg_dump SCORT | psql ANORT


 3- ScoDoc lance le script d'anonymisation config/anonymize_db.py qui:
     - vide ou anonymise certaines colonnes
     - dump cette base modifiée
     - supprime cette base.

 4- La copie dump anonymisé est uploadée.


"""
import os
import fcntl
import subprocess
import requests

from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email.header import Header

import notesdb as ndb
import sco_utils as scu
from notes_log import log
from sco_exceptions import ScoValueError

SCO_DUMP_LOCK = "/tmp/scodump.lock"


def sco_dump_and_send_db(context, REQUEST=None):
    """Dump base de données du département courant et l'envoie anonymisée pour debug"""
    H = [context.sco_header(REQUEST, page_title="Assistance technique")]
    # get currect (dept) DB name:
    cursor = ndb.SimpleQuery(context, "SELECT current_database()", {})
    db_name = cursor.fetchone()[0]
    ano_db_name = "ANO" + db_name
    # Lock
    try:
        x = open(SCO_DUMP_LOCK, "w+")
        fcntl.flock(x, fcntl.LOCK_EX | fcntl.LOCK_NB)
    except (IOError, OSError):  # exception changed from Python 2 to 3
        raise ScoValueError(
            "Un envoi de la base "
            + db_name
            + " est déjà en cours, re-essayer plus tard"
        )

    try:
        # Drop if exists
        _drop_ano_db(ano_db_name)

        # Duplicate database
        _duplicate_db(db_name, ano_db_name)

        # Anonymisation
        _anonymize_db(ano_db_name)

        # Send
        r = _send_db(context, REQUEST, ano_db_name)
        if (
            r.status_code
            == requests.codes.INSUFFICIENT_STORAGE  # pylint: disable=no-member
        ):
            H.append(
                """<p class="warning">
            Erreur: espace serveur trop plein.
            Merci de contacter <a href="mailto:{0}">{0}</a></p>""".format(
                    scu.SCO_DEV_MAIL
                )
            )
        elif r.status_code == requests.codes.OK:  # pylint: disable=no-member
            H.append("""<p>Opération effectuée.</p>""")
        else:
            H.append(
                """<p class="warning">
            Erreur: code <tt>{0} {1}</tt>
            Merci de contacter <a href="mailto:{2}">{2}</a></p>""".format(
                    r.status_code, r.reason, scu.SCO_DEV_MAIL
                )
            )

    finally:
        # Drop anonymized database
        # XXX _drop_ano_db(ano_db_name)
        # Remove lock
        fcntl.flock(x, fcntl.LOCK_UN)

    log("sco_dump_and_send_db: done.")
    return "\n".join(H) + context.sco_footer(REQUEST)


def _duplicate_db(db_name, ano_db_name):
    """Create new database, and copy old one into"""
    cmd = ["createdb", "-E", "UTF-8", ano_db_name]
    log("sco_dump_and_send_db/_duplicate_db: {}".format(cmd))
    try:
        _ = subprocess.check_output(cmd)
    except subprocess.CalledProcessError as e:
        log("sco_dump_and_send_db: exception createdb {}".format(e))
        raise ScoValueError(
            "erreur lors de la creation de la base {}".format(ano_db_name)
        )

    cmd = "pg_dump {} | psql {}".format(db_name, ano_db_name)
    log("sco_dump_and_send_db/_duplicate_db: {}".format(cmd))
    try:
        _ = subprocess.check_output(cmd, shell=1)
    except subprocess.CalledProcessError as e:
        log("sco_dump_and_send_db: exception {}".format(e))
        raise ScoValueError(
            "erreur lors de la duplication de la base {} vers {}".format(
                db_name, ano_db_name
            )
        )


def _anonymize_db(ano_db_name):
    """Anonymize a departement database"""
    cmd = os.path.join(scu.SCO_TOOLS_DIR, "anonymize_db.py")
    log("_anonymize_db: {}".format(cmd))
    try:
        _ = subprocess.check_output([cmd, ano_db_name])
    except subprocess.CalledProcessError as e:
        log("sco_dump_and_send_db: exception in anonymisation: {}".format(e))
        raise ScoValueError(
            "erreur lors de l'anonymisation de la base {}".format(ano_db_name)
        )


def _get_scodoc_serial(context):
    try:
        return int(open(os.path.join(scu.SCODOC_VERSION_DIR, "scodoc.sn")).read())
    except:
        return 0


def _send_db(context, REQUEST, ano_db_name):
    """Dump this (anonymized) database and send it to tech support"""
    log("dumping anonymized database {}".format(ano_db_name))
    try:
        data = subprocess.check_output("pg_dump {} | gzip".format(ano_db_name), shell=1)
    except subprocess.CalledProcessError as e:
        log("sco_dump_and_send_db: exception in anonymisation: {}".format(e))
        raise ScoValueError(
            "erreur lors de l'anonymisation de la base {}".format(ano_db_name)
        )

    log("uploading anonymized dump...")
    files = {"file": (ano_db_name + ".gz", data)}
    r = requests.post(
        scu.SCO_DUMP_UP_URL,
        files=files,
        data={
            "dept_name": context.get_preference("DeptName"),
            "serial": _get_scodoc_serial(context),
            "sco_user": str(REQUEST.AUTHENTICATED_USER),
            "sent_by": context.Users.user_info(str(REQUEST.AUTHENTICATED_USER))[
                "nomcomplet"
            ],
            "sco_version": scu.SCOVERSION,
            "sco_fullversion": scu.get_scodoc_version(),
        },
    )
    return r


def _drop_ano_db(ano_db_name):
    """drop temp database if it exists"""
    existing_databases = [
        s.split("|")[0].strip()
        for s in subprocess.check_output(["psql", "-l"]).split("\n")[3:]
    ]
    if ano_db_name not in existing_databases:
        log("_drop_ano_db: no temp db, nothing to drop")
        return
    cmd = ["dropdb", ano_db_name]
    log("sco_dump_and_send_db: {}".format(cmd))
    try:
        _ = subprocess.check_output(cmd)
    except subprocess.CalledProcessError as e:
        log("sco_dump_and_send_db: exception dropdb {}".format(e))
        raise ScoValueError(
            "erreur lors de la suppression de la base {}".format(ano_db_name)
        )