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"""Set up fixtures for tests"""
import io
import os
import shutil
import socket
import subprocess
from contextlib import closing

import redis
import pytest
import jsonpickle

from qc_app import create_app
from quality_control.errors import InvalidValue, DuplicateHeading

@pytest.fixture(scope="session")
def strains():
    """Parse the strains once every test session"""
    stainnames = set()
    with open("etc/strains.csv", encoding="utf8") as strains_file:
        for idx, line in enumerate(strains_file.readlines()):
            if idx > 0:
                parts = line.split()
                for name in (parts[1], parts[2]):
                    stainnames.add(name.strip())
                    if len(parts) >= 6:
                        alias = parts[5].strip()
                        if alias != "" and alias not in ("P", "\\N"):
                            stainnames.add(alias)

    return tuple(stainnames)

def is_port_in_use(port: int) -> bool:
    "Check whether `port` is in use"
    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sckt:
        return sckt.connect_ex(("localhost", port)) == 0

@pytest.fixture(scope="session")
def redis_url():
    "Fixture to launch a new redis instance and return appropriate URI"
    port = next(# pylint: disable=[stop-iteration-return]
        port for port in range(6379,65535) if not is_port_in_use(port))
    command = [shutil.which("redis-server"), "--port", str(port)]
    process = subprocess.Popen(command) # pylint: disable=[consider-using-with]
    yield f"redis://localhost:{port}"
    process.kill()

@pytest.fixture(scope="module")
def client(redis_url): # pylint: disable=[redefined-outer-name]
    "Fixture for test client"
    app = create_app(os.environ.get("QCAPP_INSTANCE_PATH"))
    app.config.update({
        "REDIS_URL": redis_url,
        "TESTING": True
    })
    yield app.test_client()

def uploadable_file_object(filename):
    "Return an 'object' representing the file to be uploaded."
    with open(f"tests/test_data/{filename}", "br") as the_file:
        return (io.BytesIO(the_file.read()), filename)

@pytest.fixture(scope="function")
def job_id():
    "Return a default UUID4 string as the 'job_id' for test purposes"
    return "934c55d8-396e-4959-90e1-2698e9205758"

@pytest.fixture(scope="function")
def redis_conn_with_fresh_job(redis_url, job_id): # pylint: disable=[redefined-outer-name]
    "redis connection with fresh, unprocessed job"
    the_job = {
        "job_id": job_id, "command": "some_test_command", "status": "pending",
        "filename": "/path/to/some/file.tsv", "percent": 0
    }
    with redis.Redis.from_url(redis_url, decode_responses=True) as rconn:
        rconn.hset(name=job_id, mapping=the_job)
        yield rconn
        rconn.hdel(job_id, *the_job.keys())
        rconn.delete(job_id)

@pytest.fixture(scope="function")
def redis_conn_with_in_progress_job_no_errors(redis_url, job_id): # pylint: disable=[redefined-outer-name]
    "redis connection with partially processed job, with no errors"
    the_job = {
        "job_id": job_id, "command": "some_test_command",
        "status": "Processing", "filename": "/path/to/some/file.tsv",
        "percent": 32.242342
    }
    with redis.Redis.from_url(redis_url, decode_responses=True) as rconn:
        rconn.hset(name=job_id, mapping=the_job)
        yield rconn
        rconn.hdel(job_id, *the_job.keys())
        rconn.delete(job_id)

@pytest.fixture(scope="function")
def redis_conn_with_in_progress_job_some_errors(redis_url, job_id): # pylint: disable=[redefined-outer-name]
    "redis connection with partially processed job, with some errors"
    the_job = {
        "job_id": job_id, "command": "some_test_command",
        "status": "Processing", "filename": "/path/to/some/file.tsv",
        "percent": 45.34245, "errors": jsonpickle.encode((
            DuplicateHeading(
                1, (5,13,19), "DupHead", "Heading 'DupHead' is repeated"),
            InvalidValue(45, 2, "ohMy", "Invalid value 'ohMy'")))
    }
    with redis.Redis.from_url(redis_url, decode_responses=True) as rconn:
        rconn.hset(name=job_id, mapping=the_job)
        yield rconn
        rconn.hdel(job_id, *the_job.keys())
        rconn.delete(job_id)

@pytest.fixture(scope="function")
def redis_conn_with_completed_job_no_errors(redis_url, job_id): # pylint: disable=[redefined-outer-name]
    "redis connection with completely processed job, with no errors"
    the_job = {
        "job_id": job_id, "command": "some_test_command",
        "status": "success", "filename": "/path/to/some/file.tsv",
        "percent": 100, "errors": jsonpickle.encode(tuple())
    }
    with redis.Redis.from_url(redis_url, decode_responses=True) as rconn:
        rconn.hset(name=job_id, mapping=the_job)
        yield rconn
        rconn.hdel(job_id, *the_job.keys())
        rconn.delete(job_id)

@pytest.fixture(scope="function")
def redis_conn_with_completed_job_some_errors(redis_url, job_id): # pylint: disable=[redefined-outer-name]
    "redis connection with completely processed job, with some errors"
    the_job = {
        "job_id": job_id, "command": "some_test_command",
        "status": "success", "filename": "/path/to/some/file.tsv",
        "percent": 100, "errors": jsonpickle.encode((
            DuplicateHeading(
                1, (5,13,19), "DupHead", "Heading 'DupHead' is repeated"),
            InvalidValue(45, 2, "ohMy", "Invalid value 'ohMy'")))
    }
    with redis.Redis.from_url(redis_url, decode_responses=True) as rconn:
        rconn.hset(name=job_id, mapping=the_job)
        yield rconn
        rconn.hdel(job_id, *the_job.keys())
        rconn.delete(job_id)

@pytest.fixture(scope="function")
def uploads_dir(client): # pylint: disable=[redefined-outer-name]
    """Returns the configured, uploads directory, creating it if it does not
    exist."""
    the_dir = client.application.config["UPLOAD_FOLDER"]
    if not os.path.exists(the_dir):
        os.mkdir(the_dir)

    return the_dir

@pytest.fixture(scope="function")
def jobs_errors_dir(uploads_dir): # pylint: disable=[redefined-outer-name]
    """Returns the configured, jobs errors directory, creating it if it does not
    exist."""
    the_dir = f"{uploads_dir}/job_errors"
    if not os.path.exists(the_dir):
        os.mkdir(the_dir)

    return the_dir

@pytest.fixture(scope="function")
def stderr_with_output(jobs_errors_dir, job_id): # pylint: disable=[redefined-outer-name]
    """Creates a sample worker error file with some content"""
    filepath = f"{jobs_errors_dir}/job_{job_id}.error"
    with open(filepath, "w", encoding="utf8") as error_file:
        error_file.write("This is an non-empty error file.")
        error_file.flush()
        yield filepath

    os.remove(filepath)

@pytest.fixture(scope="function")
def stderr_with_no_output(jobs_errors_dir, job_id): # pylint: disable=[redefined-outer-name]
    """Creates a sample worker error file with no content"""
    filepath = f"{jobs_errors_dir}/job_{job_id}.error"
    with open(filepath, "w", encoding="utf-8") as error_file:
        error_file.flush()
        yield filepath

    os.remove(filepath)