import json, datetime, fcntl, os, re, socket, subprocess, time

from flask import request, abort
from flask import Blueprint
from app import email

bp = Blueprint("routes", __name__)

# --------------------------------------------------------------
DIR = "/opt/installmgr/"
REPOSIT_DIR = "/opt/installmgr/incoming_dumps"
MAX_REPOSIT_SIZE = 100 * 20 * 1024  # kB (here, max 100 dumps of 20MB)

ALERT_MAIL_FROM = "root@scodoc.iutv.univ-paris13.fr"
ALERT_MAIL_TO = "emmanuel.viennet@gmail.com"

LOG_FILENAME = os.path.join(DIR, "upload-dump-errors.log")
UPLOAD_LOG_FILENAME = os.path.join(DIR, "upload-dump-log.json")
DEBUG = False  # if false, don't publish error messages


@bp.route("/scodoc-installmgr/last_stable_version")
def last_stable_version():
    # LAST_RELEASE_TAG=$(curl "$GITEA_RELEASE_URL" | jq ".[].tag_name" | tr -d -c "0-9.\n" | sort --version-sort | tail -1)
    return "9.0.30"


@bp.route("/scodoc-installmgr/upload_dump", methods=["POST"])
def upload_dump():
    """
    Réception d'un fichier de dump uploadé
    """
    log = open(LOG_FILENAME, "a")
    now = datetime.datetime.now()
    fulltime = now.isoformat()
    # client addr:
    remote_addr = request.environ.get("HTTP_X_Real_IP", request.remote_addr)
    log.write("{} request from {}\n".format(fulltime, remote_addr))
    # Avec seulement alphanum et tiret:
    clean_deptname = re.sub(r"[^A-Za-z-]", "", request.form["dept_name"])
    the_file = request.files["file"]
    filename = the_file.filename
    data = the_file.file.read()

    try:
        remote_host = socket.gethostbyaddr(remote_addr)[0]
    except:
        log.write("reverse DNS lookup failed for {}".format(remote_addr))
        remote_host = ""

    D = {
        "dept_name": request.form["dept_name"],
        "serial": request.form["serial"],
        "sco_user": request.form["sco_user"],
        "sent_by": request.form["sent_by"],
        "sco_version": request.form["sco_version"],
        "sco_subversion": request.form["sco_subversion"],
        "dump_filename": fulltime + "_" + clean_deptname + ".gz",
        "dump_size": len(data),
        "remote_addr": remote_addr,
        "remote_host": remote_host,
    }

    log.write("received data ({} bytes)\n".format(D["dump_size"]))
    json_descr = json.dumps(D, sort_keys=True, indent=4)
    # --- Check disk space

    cur_size = int(subprocess.check_output(["du", "-skx", REPOSIT_DIR]).split("\t")[0])

    if (cur_size + len(data) / 1024) > MAX_REPOSIT_SIZE:
        # out of space !
        log.write(
            "Out of space: cur_size={}kB, limit={}\n".format(cur_size, MAX_REPOSIT_SIZE)
        )
        # Send alert
        try:
            email.send_email(
                "[upload-dump] Out of space !",
                ALERT_MAIL_FROM,
                [ALERT_MAIL_TO],
                "Out space !\nNew upload was canceled:\n" + json_descr,
            )
        except:
            log.write("exception while sending email !\n")
        abort(507, "Insufficient Storage")
    else:
        log.write("writing dump to {}\n".format(D["dump_filename"]))
        # dump:
        f = open(os.path.join(REPOSIT_DIR, D["dump_filename"]), "wb")
        f.write(data)
        f.close()
        uplog = open(UPLOAD_LOG_FILENAME, "a")
        uplog.write(json_descr)
        uplog.write("\n,\n")  # separator
        uplog.close()

        # Send notification
        try:
            log.write("sending notification to {}\n".format(ALERT_MAIL_TO))
            email.send_email(
                f"[upload-dump] new dump {D['dept_name']} from {D['remote_addr']} ({D['remote_host']})",
                ALERT_MAIL_FROM,
                [ALERT_MAIL_TO],
                "New upload:\n" + json_descr,
            )
        except:
            log.write("exception while sending email !\n")
    return ("", 204)  # ok empty response


# Lock for counter
class Lock:
    def acquire(self):
        self.f = open("lock", "w")
        fcntl.flock(self.f.fileno(), fcntl.LOCK_EX)

    def release(self):
        self.f.close()


def increment():
    L = Lock()
    L.acquire()
    try:
        try:
            val = int(open(DIR + "/counter").read())
        except:
            val = 0
        val += 1
        open("counter", "w").write("%d" % val)
    finally:
        L.release()
    return val


@bp.route("/scodoc-installmgr/version", methods=["GET"])
def version():
    """
    echo -e "DATE\tIP\tSVN\tSERIAL\tOP" > installs.log; chown scodoc  installs.log
    """
    remote_addr = request.environ.get("HTTP_X_Real_IP", request.remote_addr)
    mode = request.args.get("mode", "?")
    sn = request.args.get("sn", "-1")  # serial number
    svn = request.args.get("svn", "-")  # installed subversion
    commit = request.args.get("commit", "-")  # installed git commit
    if mode == "install" or not sn:
        serial = increment()
    else:
        serial = sn

    f = open(DIR + "installs.log", "a")
    f.write(
        "%s\t%s\t%s\t%s\t%s\n"
        % (
            time.strftime("%Y-%m-%d %H:%M:%S"),
            remote_addr,
            svn or commit,
            serial,
            mode,
        )
    )
    f.close()