import signal
import time

import psutil

from catfish.project import Project
from catfish.utils.processes import (
    find_running_process_for,
    is_process_running,
    terminate_processes,
    wait_for_process_terminate,
)
from catfish.worker import BASE_SOCKET_DIR
from catfish.worker.server import PayloadType, read_logs_for_process, send_to_server
from tests import BaseWorkerTestCase


class WorkerServerTestCase(BaseWorkerTestCase):
    def test_ping(self):
        response = send_to_server(PayloadType.PING, {})
        self.assertEqual(response, {"ping": "pong"})


class ProcessWorkerTestCase(BaseWorkerTestCase):
    def setUp(self):
        super().setUp()
        self.project = Project(self.EXAMPLE_DIR)
        self.process = self.project.get_process("bg")

    def test_server_creates_process(self):
        response = send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        self.assertTrue(is_process_running(response["pid"]))
        self.assertEqual(find_running_process_for(self.process).pid, response["pid"])

    def test_additional_environment(self):
        response = send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        env = psutil.Process(response["pid"]).environ()
        self.assertEqual(env["PYTHONUNBUFFERED"], "1")
        self.assertEqual(env["CATFISH_IDENT"], self.process.ident)
        self.assertEqual(env["FOO"], "bar")

    def test_additional_path(self):
        response = send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        env = psutil.Process(response["pid"]).environ()
        path_dirs = env["PATH"].split(":")
        for path in self.project.get_extra_path():
            self.assertIn(str(path), path_dirs)

    def test_process_restart(self):
        response = send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        initial_pid = response["pid"]
        psutil.Process(initial_pid).send_signal(signal.SIGHUP)
        wait_for_process_terminate(initial_pid)
        time.sleep(2)
        new_process = find_running_process_for(self.process)
        self.assertNotEqual(new_process.pid, initial_pid)
        self.assertFalse(is_process_running(initial_pid))
        self.assertTrue(is_process_running(new_process.pid))

    def test_process_restart_on_1_exit(self):
        response = send_to_server(
            PayloadType.PROCESS, {"path": str(self.project.root), "process": "die"}
        )
        initial_pid = response["pid"]
        wait_for_process_terminate(initial_pid)
        time.sleep(2)
        new_process = find_running_process_for(self.project.get_process("die"))
        self.assertNotEqual(new_process.pid, initial_pid)
        self.assertFalse(is_process_running(initial_pid))
        self.assertTrue(is_process_running(new_process.pid))

    def test_process_restart_on_0_exit(self):
        response = send_to_server(
            PayloadType.PROCESS, {"path": str(self.project.root), "process": "exit"}
        )
        initial_pid = response["pid"]
        wait_for_process_terminate(initial_pid)
        time.sleep(2)
        new_process = find_running_process_for(self.project.get_process("exit"))
        self.assertNotEqual(new_process.pid, initial_pid)
        self.assertFalse(is_process_running(initial_pid))
        self.assertTrue(is_process_running(new_process.pid))

    def test_process_terminate(self):
        response = send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        initial_pid = response["pid"]
        terminate_processes([psutil.Process(initial_pid)])
        wait_for_process_terminate(initial_pid)
        time.sleep(2)
        self.assertIsNone(find_running_process_for(self.process))
        self.assertFalse(is_process_running(initial_pid))


class ProcessLogsTestCase(BaseWorkerTestCase):
    def setUp(self):
        super().setUp()
        self.project = Project(self.EXAMPLE_DIR)
        self.process = self.project.get_process("bg")

    def test_creates_socket(self):
        send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        stdout_socket = BASE_SOCKET_DIR.joinpath(self.process.logs_socket)
        self.assertTrue(stdout_socket.exists())

    def test_gets_logs(self):
        send_to_server(
            PayloadType.PROCESS,
            {"path": str(self.project.root), "process": str(self.process.name)},
        )
        stdout_iter = read_logs_for_process(self.process)
        for i in range(3):
            self.assertEqual(next(stdout_iter), "Round {}".format(i))