#!/usr/bin/python3

# Libre en Communs's cotisation control program
# Copyright (C) 2022 Libre en Communs

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import os, requests, json, datetime, shutil, quopri, subprocess, base64
from requests.auth import HTTPBasicAuth
from requests.auth import HTTPDigestAuth


VERSION="0.0.1"
GESTION_SECRET_FILE="/home/tresorier/.secret/gestion_api_password"
GIT_SECRET_FILE="/home/tresorier/.secret/git_api_password"
WORKDIR="/srv/validation_cotisation.d"
MODALITY_MAIL="mail_instructions.txt"
MODALITY_MAIL_HEADERS="mail_instructions_headers.txt"
RECEPT_MAIL="mail_recu.txt"
RECEPT_MAIL_HEADERS="mail_recu_headers.txt"
RECEPT_MAIL_ATTACHMENT="mail_recu_attachment.txt"
SUMMARY_MAIL="mail_recap_header.txt"
SENDMAIL_LOCATION = "/usr/sbin/sendmail" # sendmail location
BUF=[]

# gestion_read("SELECT * FROM services_users su \
# INNER JOIN membres m ON m.id = su.id_user \
# INNER JOIN services_fees sf ON sf.id = su.id_fee \
# LEFT JOIN acc_transactions_users tu ON tu.id_service_user = su.id \
# LEFT JOIN acc_transactions_lines l ON l.id_transaction = tu.id_transaction \
# WHERE m.id = 3 AND l.id_account = 481;")

def gestion_get_secret():
    with open(GESTION_SECRET_FILE) as sfile:
        return sfile.readline().replace("\n", "")

def git_get_secret():
    with open(GIT_SECRET_FILE) as sfile:
        return sfile.readline().replace("\n", "")

def get_file_content(filename):
    with open(filename) as sfile:
        return sfile.readlines()

def get_file_content_all(filename):
    with open(filename) as sfile:
        return sfile.read()

def set_file_content(filename, lines):
    with open(filename, "x") as sfile:
        return sfile.writelines(lines)

def gestion_read(req):
    response = requests.post('https://gestion.a-lec.org/api/sql/',
            auth = HTTPBasicAuth('api666', gestion_get_secret()),
            data = req)
    return response.json()

def git_mail_ticket_read(req):
    response = requests.get('https://git.a-lec.org/api/v4/projects/46/issues',
                headers={'PRIVATE-TOKEN' : git_get_secret()},
                params = req)
    return response.json()

def git_xmpp_ticket_create(req):
    response = requests.post('https://git.a-lec.org/api/v4/projects/44/issues',
                headers={'PRIVATE-TOKEN' : git_get_secret()},
                data = req)
    return response.json()

def gestion_adduser(req):
    response = requests.put('https://gestion.a-lec.org/api/user/import',
            auth = HTTPBasicAuth('api666', gestion_get_secret()),
            data = req)
    return response.content

def setup_workdir():
    if not os.path.isdir(WORKDIR):
        os.mkdir(WORKDIR)
    if not "impayé" in os.listdir(WORKDIR):
        os.mkdir(WORKDIR+"/impayé")
    if not "expiré" in os.listdir(WORKDIR):
        os.mkdir(WORKDIR+"/expiré")
    if not "validé" in os.listdir(WORKDIR):
        os.mkdir(WORKDIR+"/validé")
    if not "transition" in os.listdir(WORKDIR):
        os.mkdir(WORKDIR+"/transition")

def sendmail(headers, data):
    msg = bytes(headers + "\n", 'utf-8') + quopri.encodestring(bytes(data, 'utf-8'))
    subprocess.run([SENDMAIL_LOCATION, "-t", "-oi"], input=msg)

def sendmail_with_attachment(headers, data, attachment_header, attachment, ending):
    msg = bytes(headers + "\n", 'utf-8') \
        + quopri.encodestring(bytes(data, 'utf-8')) \
        + bytes(attachment_header + "\n", 'utf-8') \
        + base64.b64encode(attachment) \
        + bytes(ending, 'utf-8')

    subprocess.run([SENDMAIL_LOCATION, "-t", "-oi"], input=msg)

def gestion_get_expired():
    request_expired = "SELECT id_user FROM services_users su " +\
                      "INNER JOIN membres m ON m.id = su.id_user " +\
                      "INNER JOIN services s ON s.id = su.id_service " +\
                      "LEFT JOIN services_fees sf ON sf.id = su.id_fee " +\
                      "INNER JOIN (SELECT id, MAX(date) " +\
                      "FROM services_users " +\
                      "GROUP BY id_user, id_service) " +\
                      "AS su2 ON su2.id = su.id " +\
                      "WHERE su.id_service = 1 " +\
                        "AND su.expiry_date < date() " +\
                        "AND NOT (m.id_category = 10 " +\
                        "OR m.id_category = 3 " +\
                        "OR m.id_category = 2 " +\
                        "OR m.id_category = 8);"
    expired_members_list = \
        [ str(x["id_user"]) for x in gestion_read(request_expired)["results"]]

    return expired_members_list.copy()

def gestion_get_unpaid():
    request_unpaid = "SELECT id_user FROM services_users su " +\
                      "INNER JOIN membres m ON m.id = su.id_user " +\
                      "INNER JOIN services s ON s.id = su.id_service " +\
                      "LEFT JOIN services_fees sf ON sf.id = su.id_fee " +\
                      "INNER JOIN (SELECT id, MAX(date) " +\
                      "FROM services_users " +\
                      "GROUP BY id_user, id_service) " +\
                      "AS su2 ON su2.id = su.id " +\
                      "WHERE su.id_service = 1 " +\
                        "AND su.paid = 0 " +\
                        "AND NOT (m.id_category = 10 " +\
                        "OR m.id_category = 3 " +\
                        "OR m.id_category = 2 " +\
                        "OR m.id_category = 8);"


    unpaid_members_list = \
        [ str(x["id_user"]) for x in gestion_read(request_unpaid)["results"]]

    return unpaid_members_list.copy()

def get_member_infos(member):
    request =  "SELECT * FROM membres " +\
        "WHERE id = '{}';".format(member)
    try:
        name = gestion_read(request)['results'][-1]['nom']
        numero = gestion_read(request)['results'][-1]['numero']
        email = gestion_read(request)['results'][-1]['email']
    except:
        print(gestion_read(request))
        raise(Exception)
    return (name, numero, email)

def check_email_created(member):

    # Get member infos
    name, numero, email = get_member_infos(member)

    request = { 'not[labels]' : "Résolu",
                'state' : "opened" }
    answer = git_mail_ticket_read(request)

    for ticket in answer:
        if "n°{}.".format(numero) in ticket['title']:
            return False
    return True

def notify_expired(member):
    BUF.append("* {}".format(member))
    BUF.append("  NOTIFICATION TRESORIER")
    BUF.append("")

def notify_unpaid(member):
    if not check_email_created(member):
        return False

    # Get member infos
    name, numero, email = get_member_infos(member)

    BUF.append("* {} (numero {}), {}".format(member, numero, name))
    BUF.append("  NOTIFICATION MEMBRE")
    BUF.append("")
    return True

def renotify_unpaid(member):

    # Get member infos
    name, numero, email = get_member_infos(member)

    BUF.append("* {} (numero {}), {}".format(member, numero, name))
    BUF.append("  RENOTIFICATION MEMBRE")
    BUF.append("")
    pass

def check_expired_unpaid():
    expired_members = gestion_get_expired()
    unpaid_members = gestion_get_unpaid()

    # Check expired members
    if set(expired_members) != set(os.listdir(WORKDIR+"/expiré")):
        BUF.append("Membres expirés : {}".format(gestion_get_expired()))

        # Check for no-more-expired members
        for record in os.listdir(WORKDIR+"/expiré"):
            if not record in expired_members:
                os.rename(WORKDIR+"/expiré/"+record,
                    WORKDIR+"/transition/"+record)

        # Check for new expired members
        for member in expired_members:
            if not str(member) in os.listdir(WORKDIR+"/expiré"):
                set_file_content(WORKDIR+"/expiré/"+str(member), "")
                notify_expired(member)

    # Check unpaid members
    if set(unpaid_members) != set(os.listdir(WORKDIR+"/impayé")):
        BUF.append("Membres en impayé : {}".format(gestion_get_unpaid()))

        # Check for no-more-unpaid members
        for record in os.listdir(WORKDIR+"/impayé"):
            if not record in unpaid_members:
                os.rename(WORKDIR+"/impayé/"+record,
                    WORKDIR+"/transition/"+record)

        # Check for new unpaid members and set date of first contact
        for member in unpaid_members:
            if not member in os.listdir(WORKDIR+"/impayé"):
                # Get member infos
                name, numero, email = get_member_infos(member)

                if notify_unpaid(member):
                    set_file_content(WORKDIR+"/impayé/"+str(member),
                            str(datetime.datetime.now().strftime("%d/%m/%Y")))
                else:
                    # Ancient date for the system to be triggered
                    set_file_content(WORKDIR+"/impayé/"+str(member),"27/09/1983")
                    BUF.append("* {} (numero {}), {}".format(member, numero, name))
                    BUF.append("  COURRIEL NON FONCTIONNEL")

    # Check periodically for unpaid members
    for record in os.listdir(WORKDIR+"/impayé"):
        last_contact = \
            datetime.datetime.strptime(
                get_file_content(WORKDIR+"/impayé/"+record)[0],'%d/%m/%Y')

        # Too old to be a relaunch
        if abs(datetime.datetime.now() - last_contact).days > 300:
            if notify_unpaid(record):
                os.remove(WORKDIR+"/impayé/"+str(record))
                set_file_content(WORKDIR+"/impayé/"+str(record),
                            str(datetime.datetime.now().strftime("%d/%m/%Y")))
        # Relaunch
        elif abs(datetime.datetime.now() - last_contact).days > 30:
            renotify_unpaid(record)
            os.remove(WORKDIR+"/impayé/"+str(record))
            set_file_content(WORKDIR+"/impayé/"+str(record),
                            str(datetime.datetime.now().strftime("%d/%m/%Y")))

    # Clean transited member if unpaid or expired
    for record in os.listdir(WORKDIR+"/transition"):
        if record in os.listdir(WORKDIR+"/impayé") or \
            record in os.listdir(WORKDIR+"/expiré"):
                os.remove(WORKDIR+"/transition/"+record)

def validate(member):

    # Get infos
    request = "SELECT *, l.reference true_reference " +\
              "FROM services_users su " +\
              "INNER JOIN membres m ON m.id = su.id_user " +\
              "INNER JOIN services_fees sf ON sf.id = su.id_fee " +\
              "LEFT JOIN acc_transactions_users tu ON tu.id_service_user = su.id " +\
              "LEFT JOIN acc_transactions_lines l ON l.id_transaction = tu.id_transaction " +\
              "INNER JOIN acc_transactions tr ON tr.id = l.id_transaction " +\
              "WHERE m.id = {} AND l.id_account = 481;".format(member)
# Note: su.id_service = 1 parceque la cotisation correspond au service 1

    try:
        answer = gestion_read(request)["results"][-1]
    except:
        print(gestion_read(request))
        raise(Exception)

    date = datetime.datetime.strptime(
        answer["date"],'%Y-%m-%d').strftime("%d/%m/%Y")
    filename = "{}_reçu_{}".format(
                answer["nom"].replace(" ", "_"),
                date.replace("/", "."))

    BUF.append("* {} (numero {}), {}".format(answer["id"],
                                            answer["numero"],
                                            answer["nom"]))
    BUF.append("  COTISATION : {},{}€".format(str(answer["amount"])[:-2],
                                              str(answer["amount"])[-2:]))
    BUF.append("  ANNEE CIVILE : {}".format(answer["date"][:4]))
    BUF.append("  VALIDATION MEMBRE")
    BUF.append("")

    # Generate receipt
    latexfile = get_file_content_all("RECU_COTISATION.tex")
    latexfile = latexfile.replace("ANNEE-CIVILE", answer["date"][:4])
    latexfile = latexfile.replace("NOM-COTISANT", answer["nom"])
    latexfile = latexfile.replace("STATUT-COTISANT", answer["statut_juridique"])
    latexfile = latexfile.replace("ADRESSE-COTISANT", "{}, {} {}".format(
                                                    answer["adresse"],
                                                    answer["code_postal"],
                                                    answer["ville"]))
    latexfile = latexfile.replace("SOMME", "{},{}".format(
                                                    str(answer["amount"])[:-2],
                                                    str(answer["amount"])[-2:]))
    latexfile = latexfile.replace("DATE-VERSEMENT", date)
    latexfile = latexfile.replace("MODE-VERSEMENT", answer["true_reference"])

    try:
        os.remove(WORKDIR+"/validé/"+filename+".tex")
    except:
        pass
    set_file_content(WORKDIR+"/validé/"+filename+".tex", latexfile)
    os.system("cd {} && pdflatex {}".format(WORKDIR+"/validé/", filename+".tex"))

    # Preparing mail
    mailheaders = get_file_content_all(RECEPT_MAIL_HEADERS).replace("COURRIEL-COTISANT",
                                                        answer["email"]) + "\n"
    mailtext = get_file_content_all(RECEPT_MAIL).replace("ANNEE-CIVILE",
                                                        answer["date"][:4]) + "\n"
    mailtattach = get_file_content_all(RECEPT_MAIL_ATTACHMENT) + "\n"

    # Opening PDF file as binary
    attachment = open(WORKDIR+"/validé/"+filename+".pdf", "rb")
    data = attachment.read()
    attachment.close()

    ending = "--------------3yxkFgv0AINs5nd0i6BJrWaV--"

    sendmail_with_attachment(mailheaders, mailtext, mailtattach, data, ending)

    # The end
    os.remove(WORKDIR+"/transition/"+member)

def validate_members():
    for record in os.listdir(WORKDIR+"/transition"):
        validate(record)

def main():
    setup_workdir()
    check_expired_unpaid()
    validate_members()

    # End of work
    # Launch summary mail
    mailheaders = get_file_content_all(SUMMARY_MAIL) + "\n"
    mailtext = ""

    is_sendable = False;
    for line in BUF:
        mailtext += line + "\n"
        is_sendable = True;
        print(line)

    if is_sendable:
        sendmail(mailheaders, mailtext)

## Bootstrap
if __name__ == '__main__':
    main()