# set python command if 'py' not installed
builtin which py > /dev/null || alias py='python3'

# Find python file
alias pyfind='find . -name "*.py"'

# Remove python compiled byte-code and mypy/pytest cache in either the current
# directory or in a list of specified directories (including sub directories).
function pyclean() {
  find "${@:-.}" -type f -name "*.py[co]" -delete
  find "${@:-.}" -type d -name "__pycache__" -delete
  find "${@:-.}" -depth -type d -name ".mypy_cache" -exec rm -r "{}" +
  find "${@:-.}" -depth -type d -name ".pytest_cache" -exec rm -r "{}" +
}

# Add the user installed site-packages paths to PYTHONPATH, only if the
#   directory exists. Also preserve the current PYTHONPATH value.
# Feel free to autorun this when .zshrc loads.
function pyuserpaths() {
  setopt localoptions extendedglob

  # Check for a non-standard install directory.
  local user_base="${PYTHONUSERBASE:-"${HOME}/.local"}"

  local python version site_pkgs
  for python in python2 python3; do
    # Check if command exists
    (( ${+commands[$python]} )) || continue

    # Get minor release version.
    # The patch version is variable length, truncate it.
    version=${(M)${"$($python -V 2>&1)":7}#[^.]##.[^.]##}

    # Add version specific path, if:
    # - it exists in the filesystem
    # - it isn't in $PYTHONPATH already.
    site_pkgs="${user_base}/lib/python${version}/site-packages"
    [[ -d "$site_pkgs" && ! "$PYTHONPATH" =~ (^|:)"$site_pkgs"(:|$) ]] || continue
    export PYTHONPATH="${site_pkgs}${PYTHONPATH+":${PYTHONPATH}"}"
  done
}

# Grep among .py files
alias pygrep='grep -nr --include="*.py"'

# Share local directory as a HTTP server
alias pyserver="python3 -m http.server"


## venv utilities
: ${PYTHON_VENV_NAME:=venv}

# Activate a the python virtual environment specified.
# If none specified, use $PYTHON_VENV_NAME, else 'venv'.
function vrun() {
  local name="${1:-$PYTHON_VENV_NAME}"
  local venvpath="${name:P}"

  if [[ ! -d "$venvpath" ]]; then
    echo >&2 "Error: no such venv in current directory: $name"
    return 1
  fi

  if [[ ! -f "${venvpath}/bin/activate" ]]; then
    echo >&2 "Error: '${name}' is not a proper virtual environment"
    return 1
  fi

  . "${venvpath}/bin/activate" || return $?
  echo "Activated virtual environment ${name}"
}

# Create a new virtual environment using the specified name.
# If none specified, use $PYTHON_VENV_NAME
function mkv() {
  local name="${1:-$PYTHON_VENV_NAME}"
  local venvpath="${name:P}"

  python3 -m venv "${name}" || return
  echo >&2 "Created venv in '${venvpath}'"
  vrun "${name}"
}

if [[ "$PYTHON_AUTO_VRUN" == "true" ]]; then
  # Automatically activate venv when changing dir
  function auto_vrun() {
    # deactivate if we're on a different dir than VIRTUAL_ENV states
    # we don't deactivate subdirectories!
    if (( $+functions[deactivate] )) && [[ $PWD != ${VIRTUAL_ENV:h}* ]]; then
      deactivate > /dev/null 2>&1
    fi

    if [[ $PWD != ${VIRTUAL_ENV:h} ]]; then
      for _file in "${PYTHON_VENV_NAME}"*/bin/activate(N.); do
        # make sure we're not in a venv already
        (( $+functions[deactivate] )) && deactivate > /dev/null 2>&1
        source $_file > /dev/null 2>&1
        break
      done
    fi
  }
  add-zsh-hook chpwd auto_vrun
  auto_vrun
fi
