# SeisComP init script for CAPS
# Code is required to be Python 2 and 3 compatible
# pylint: disable=consider-using-f-string, unspecified-encoding

import os
import subprocess
import time

import seiscomp.kernel


class Module(seiscomp.kernel.Module):
    def __init__(self, env):
        seiscomp.kernel.Module.__init__(self, env, env.moduleName(__file__))
        self.killTimeout = 60
        self.reloadTimeout = 60

    def updateConfigProxy(self):
        return "trunk"

    def updateConfig(self):
        # By default the "trunk" module must be configured to write the
        # bindings into the database
        return 0

    def supportsAliases(self):
        # The default handler does not support aliases
        return True

    def reload(self):
        if not self.isRunning():
            self.env.log("{} is not running".format(self.name))
            return 1

        self.env.log("reloading {}".format(self.name))

        lockfile = self.env.lockFile(self.name)
        reloadfile = os.path.join(
            os.path.dirname(lockfile), "{}.reload".format(self.name)
        )

        # Open pid file
        with open(lockfile, "r") as f:
            # Try to read the pid
            pid = int(f.readline())

            # Create empty reload file to be removed by CAPS server after
            # reload is complete.
            try:
                with open(reloadfile, "a"):
                    pass
            except OSError as e:
                self.env.log(
                    "could not create reload file {}: {}".format(reloadfile, e)
                )
                return 1

            # Send SIGHUP
            subprocess.call("kill -s USR1 %d" % pid, shell=True)

            # wait for reload file to disappear
            for _ in range(0, int(self.reloadTimeout * 5)):
                time.sleep(0.2)
                if not os.path.isfile(reloadfile):
                    return 0

            self.env.log("timeout exceeded")

        return 1