import os
import re
import secrets
import subprocess
from pathlib import Path

import pytest
from sqlalchemy import select
from sqlalchemy.orm import Session

from fietsboek import models
from .conftest import fietsctl_results  # pylint: disable=relative-beyond-top-level
from ..testutils import populate  # pylint: disable=relative-beyond-top-level


class CliChecker:
    """Result of a CLI tool invocation, with useful methods for tests."""

    def __init__(self, result):
        self.result = result

    @property
    def args(self):
        """Arguments to the CLI invocation."""
        return self.result.args

    @property
    def returncode(self) -> int:
        """Return code."""
        return self.result.returncode

    def successful(self) -> bool:
        """Whether the invocation was successful (based on the return code)."""
        return self.returncode == os.EX_OK

    @property
    def stdout(self) -> bytes:
        """Standard output."""
        return self.result.stdout or b""

    def has_line(self, regex: str) -> bool:
        """Checks whether the output has a line matching the given regex."""
        pattern = re.compile(regex)
        for line in self.stdout.split(b"\n"):
            ascii_line = line.decode("ascii", "ignore")
            if pattern.search(ascii_line):
                return True
        return False

    def report(self):
        """Formats the output for reporting in pytest."""
        return f"cmd: {self.args} -> {self.returncode}\n" + self.stdout.decode("ascii", "ignore")


@pytest.fixture
def fietsctl(app, dbengine, ini_file, data_manager):
    """A fietsctl invocation helper."""
    # Ideally, we want to use the ini file. However, the ini doesn't have a data
    # dir defined (as we use a temporary path for that), so we need to create a
    # new one.
    # Ideally², we'd create that ini file in the temporary folder, but that
    # gives us the wrong sqlite database (as that uses %(here)). So we could
    # either figure out the actual SQLite path and patch that as well, or "give
    # up" and create the ini in the correct working dir.
    # To do that, we add some random bytes to avoid collisions, and we remove
    # the file at the end.
    data_dir = data_manager.data_dir
    entropy = secrets.token_hex(4)
    config_path = Path(ini_file).with_name(f"testing.{entropy}.ini")
    assert not config_path.exists(), "file collision - rerun tests!"
    config = Path(ini_file).read_text(encoding="ascii")
    config = config.replace("# %% fietsboek.data_dir %%", f"fietsboek.data_dir = {data_dir}")
    config_path.write_text(config, encoding="ascii")

    def run_inner(args):
        cmd = ["fietsctl"] + args + ["-c", str(config_path)]
        result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, check=False)
        checker = CliChecker(result)
        fietsctl_results.append(checker)
        return checker

    yield run_inner

    config_path.unlink()


def test_user_add(fietsctl, dbsession):
    res = fietsctl(
        ["user", "add", "--email", "foo@bar.com", "--name", "Remy", "--password", "hadley"]
    )
    assert res.successful()

    res = fietsctl([
        "user", "add",
        "--email", "bar@foo.com",
        "--name", "James",
        "--password", "wilson",
        "--admin",
    ])
    assert res.successful()

    user: models.User = (
        dbsession.execute(select(models.User).filter_by(email="foo@bar.com")).scalar_one()
    )

    assert user.name == "Remy"
    user.check_password("hadley")
    assert user.session_secret
    assert not user.is_admin
    assert user.is_verified

    user: models.User = (
        dbsession.execute(select(models.User).filter_by(email="bar@foo.com")).scalar_one()
    )

    assert user.name == "James"
    user.check_password("wilson")
    assert user.session_secret
    assert user.is_admin
    assert user.is_verified


def test_user_list(fietsctl, dbengine, data_manager):
    populate(dbengine, data_manager)

    res = fietsctl(["user", "list"])
    assert res.successful()
    assert res.has_line("av.*jon\\.snow@nw\\.org.*Jon")
    assert res.has_line("v.*davos@seaworth\\.com.*Davos")


def test_user_del(fietsctl, dbengine, data_manager):
    populate(dbengine, data_manager)

    res = fietsctl(["user", "del", "-f", "--email", "jon.snow@nw.org"])
    assert res.successful()

    with dbengine.connect() as conn:
        qry = select(models.User).filter_by(email="davos@seaworth.com")
        row = conn.execute(qry).scalar_one_or_none()
        assert row
        qry = select(models.User).filter_by(email="jon.snow@nw.org")
        row = conn.execute(qry).scalar_one_or_none()
        assert row is None

    res = fietsctl(["user", "del", "-f", "--email", "davos@seaworth.com"])
    assert res.successful()

    with dbengine.connect() as conn:
        qry = select(models.User).filter_by(email="davos@seaworth.com")
        row = conn.execute(qry).scalar_one_or_none()
        assert row is None


def test_user_passwd(fietsctl, dbengine, data_manager):
    ids = populate(dbengine, data_manager)

    res = fietsctl(["user", "passwd", "--email", "jon.snow@nw.org", "--password", "Ghost"])
    assert res.successful()

    with Session(dbengine) as session:
        user = session.get(models.User, ids.jon)
        user.check_password("Ghost")
        with pytest.raises(models.user.PasswordMismatch):
            user.check_password("ygritte")


def test_user_modify(fietsctl, dbengine, data_manager):
    ids = populate(dbengine, data_manager)

    res = fietsctl([
        "user", "modify",
        "--email", "davos@seaworth.com",
        "--admin",
        "--no-verified",
        "--set-email", "ser.davos@seaworth.com",
    ])
    assert res.successful()

    with Session(dbengine) as session:
        user: models.User = session.get(models.User, ids.davos)
        assert not user.is_verified
        assert user.is_admin
        assert user.email == "ser.davos@seaworth.com"


def test_track_list(fietsctl, dbengine, data_manager):
    populate(dbengine, data_manager)

    res = fietsctl(["track", "list"])
    assert res.successful()
    assert res.has_line("Jon.*Trip around Winterfell")
    assert res.has_line("Jon.*Road to Riverrun")


def test_track_del(fietsctl, dbengine, data_manager):
    ids = populate(dbengine, data_manager)

    res = fietsctl(["track", "del", "-i", str(ids.winterfell)])
    assert not res.successful()

    res = fietsctl(["track", "del", "-i", str(ids.winterfell), "-f"])
    assert res.successful()

    with Session(dbengine) as session:
        track = session.get(models.Track, ids.winterfell)
        assert track is None

    with pytest.raises(FileNotFoundError):
        data_manager.open(ids.winterfell)