"""Nox sessions for backend tasks.

Run with `nox -s <session>` from the backend directory.
"""

import os
import shutil
import sys
from pathlib import Path

import nox
from nox_poetry import Session
from nox_poetry import session


package = "backend"
python_versions = ["3.13"]
nox.needs_version = ">= 2025.5.1"
nox.options.sessions = (
    "precommit",
    "safety",
    "mypy",
    "tests",
    "typeguard",
    "xdoctest",
    "docs-build",
)


@session(name="pre-commit", python=python_versions[0])
def precommit(session: Session) -> None:
    """Run pre-commit checks by delegating to the root noxfile.

    Args:
        session: The Nox session object.
    """
    session.run("nox", "-f", "../noxfile.py", "-s", "pre-commit", external=True)


package = "backend"


@session(python=python_versions[0])
def safety(session: Session) -> None:
    """Scan dependencies for insecure packages.

    Args:
        session: The Nox session object.
    """
    requirements = session.poetry.export_requirements()
    session.install("safety")
    session.run("safety", "scan", "--full-report", f"--file={requirements}")


@session(python=python_versions)
def mypy(session: Session) -> None:
    """Type-check using mypy.

    Args:
        session: The Nox session object.
    """
    args = session.posargs or ["src", "tests", "docs/conf.py"]
    session.install(".")
    session.install("mypy", "pytest", "pytest-asyncio")
    session.run("mypy", *args)
    if not session.posargs:
        session.run("mypy", f"--python-executable={sys.executable}", "noxfile.py")


@session(python=python_versions)
def tests(session: Session) -> None:
    """Run the test suite.

    Args:
        session: The Nox session object.
    """
    session.install(".")
    session.install(
        "coverage[toml]",
        "pytest",
        "pygments",
        "pytest-asyncio",
        "python-dotenv",
        "pytest-dotenv",
    )
    # Load the .env file (change path if needed)
    # pytest-dotenv will automatically load the .env file before tests
    try:
        session.run("coverage", "run", "--parallel", "-m", "pytest", *session.posargs)
    finally:
        if session.interactive:
            session.notify("coverage", posargs=[])


@session(python=python_versions[0])
def coverage(session: Session) -> None:
    """Produce the coverage report.

    Args:
        session: The Nox session object.
    """
    args = session.posargs or ["report", "--fail-under=90"]

    session.install("coverage[toml]")

    if not session.posargs and any(Path().glob(".coverage.*")):
        session.run("coverage", "combine")

    session.run("coverage", *args)


@session(python=python_versions[0])
def typeguard(session: Session) -> None:
    """Runtime type checking using Typeguard.

    Args:
        session: The Nox session object.
    """
    session.install(".")
    session.install("pytest", "typeguard", "pygments", "pytest-asyncio")
    session.run("pytest", f"--typeguard-packages={package}", *session.posargs)


@session(python=python_versions)
def xdoctest(session: Session) -> None:
    """Run examples with xdoctest.

    Args:
        session: The Nox session object.
    """
    if session.posargs:
        args = [package, *session.posargs]
    else:
        args = [f"--modname={package}", "--command=all"]
        if "FORCE_COLOR" in os.environ:
            args.append("--colored=1")

    session.install(".")
    session.install("xdoctest[colors]")
    session.run("python", "-m", "xdoctest", *args)


@session(name="docs-build", python=python_versions[0])
def docs_build(session: Session) -> None:
    """Build the documentation.

    Args:
        session: The Nox session object.
    """
    args = session.posargs or ["docs", "docs/_build"]
    if not session.posargs and "FORCE_COLOR" in os.environ:
        args.insert(0, "--color")

    session.install(".")
    session.install("sphinx", "sphinx-click", "furo", "myst-parser")

    build_dir = Path("docs", "_build")
    if build_dir.exists():
        shutil.rmtree(build_dir)

    session.run("sphinx-build", *args)


@session(python=python_versions[0])
def docs(session: Session) -> None:
    """Build and serve the documentation with live reloading on file changes.

    Args:
        session: The Nox session object.
    """
    args = session.posargs or ["--open-browser", "docs", "docs/_build"]
    session.install(".")
    session.install("sphinx", "sphinx-autobuild", "sphinx-click", "furo", "myst-parser")

    build_dir = Path("docs", "_build")
    if build_dir.exists():
        shutil.rmtree(build_dir)

    session.run("sphinx-autobuild", *args)