#!/bin/bash

# omarchy:summary=Install the Hermes CLI as a mise-backed wrapper in ~/.local/bin
# omarchy:args=[--now]
# omarchy:examples=omarchy install hermes cli | omarchy install hermes cli --now

# Hermes pins every one of its dependencies exactly and declares
# Requires-Python >=3.11,<3.14, so it can neither be built against Arch's
# Python nor share the python-* packages. mise builds it a private environment
# instead.
#
# It gets its own installer rather than a line in omarchy-mise-install because
# of the interpreter pin. Given no compatible interpreter to hand, uv builds
# the venv against the system Python in violation of Hermes' own bound,
# reports success, and leaves the breakage to surface later inside a
# dependency -- and omarchy-mise-install writes a fixed stub with nowhere to
# say otherwise.
#
# There is only ever one Hermes on a machine. hermes-desktop cannot run against
# this one -- it needs a runtime built from its own commit, and the version gap
# fails its readiness probe -- so it installs its own under ~/.hermes and puts
# that on PATH. When the package is present it therefore owns Hermes outright:
# this installer stands aside and removes its own copy, so the terminal, the
# default agent and the app are all the same installation.

set -euo pipefail

mode=${1:-}

tool='pipx:hermes-agent[extras=all]'
python='3.13'

# The package, not the runtime directory: it is installed before the app has
# ever run, and that is exactly when we must not start building a second copy.
desktop_owns_hermes() {
  omarchy-pkg-present hermes-desktop
}

# The venv appears at the python-deps stage, several stages before the one that
# installs the command, so its presence says nothing about being usable. The
# marker is written last, and the command is what the agent actually runs.
desktop_hermes_ready() {
  [[ -f $HOME/.hermes/hermes-agent/.hermes-bootstrap-complete ]] || return 1
  [[ -x $HOME/.local/bin/hermes ]] || return 1

  # An executable of that name proves nothing about whose it is; the app's own
  # points into ~/.hermes, and anything else is not the install we are asking
  # about.
  grep -q "$HOME/.hermes" "$HOME/.local/bin/hermes"
}

# Whether Hermes is really installed, not merely whether the stub exists. A
# stub on its own is cold: running it installs Hermes, which takes minutes.
installed() {
  [[ -d "$(mise where "$tool" 2>/dev/null)/hermes-agent/lib/python$python" ]]
}

# --check lets callers tell a cold stub from a working one before they commit
# to a path that assumes Hermes is ready.
if [[ $mode == "--check" ]]; then
  if desktop_owns_hermes; then
    if desktop_hermes_ready; then exit 0; else exit 1; fi
  fi
  if installed; then exit 0; else exit 1; fi
fi

# Hand Hermes over to the app rather than keeping a second copy beside it.
if desktop_owns_hermes; then
  # Not gated on that copy being healthy: `mise up` can rebuild it against the
  # wrong interpreter and a half-finished install answers to neither test, and
  # either way it is still a second Hermes. Removing nothing is harmless.
  if mise where "$tool" >/dev/null 2>&1; then
    echo "Hermes Desktop provides Hermes; removing the separate CLI install..." >&2
  fi

  mise rm -g "$tool" >/dev/null 2>&1 || true
  mise uninstall --all "$tool" >/dev/null 2>&1 || true

  # Our own stub has to go with it. Left in place it still answers `hermes`
  # until the app's bootstrap overwrites it, and answering means building the
  # second Hermes this whole arrangement exists to avoid.
  if [[ -f $HOME/.local/bin/hermes ]] && grep -q omarchy-install-hermes-cli "$HOME/.local/bin/hermes"; then
    rm -f "$HOME/.local/bin/hermes"
  fi

  if desktop_hermes_ready; then
    exit 0
  fi

  echo "Hermes Desktop is installed but has not set Hermes up yet." >&2
  echo "Launch Hermes Desktop once to finish installing it." >&2
  exit 1
fi

mkdir -p "$HOME/.local/bin"
rm -f "$HOME/.local/bin/hermes"

cat >"$HOME/.local/bin/hermes" <<EOF
#!/bin/bash

# Written by omarchy-install-hermes-cli.

export UV_PYTHON="$python"

# Exported rather than set on the install line alone, so the version resolved
# to run agrees with the one just installed. Hermes ships several times a week
# and mise's cooldown would otherwise hold a new release back for days.
export MISE_MINIMUM_RELEASE_AGE=0

# mise up -- which omarchy update runs -- reinstalls without that pin, so this
# asks which interpreter is actually there rather than whether anything is.
if ! [[ -d "\$(mise where '$tool' 2>/dev/null)/hermes-agent/lib/python$python" ]]; then
  echo "Installing Hermes on Python $python (this takes a minute)..." >&2

  # mise's pipx backend shells out to uv, which a stock Omarchy does not have.
  # It is fetched here rather than when this stub was written, so setting up a
  # machine that never runs Hermes costs nothing.
  if omarchy-cmd-missing uv && ! mise where uv >/dev/null 2>&1; then
    mise use -g --quiet uv@latest || exit 1
  fi

  mise use -g --quiet --force '$tool' || exit 1
fi

exec mise x '$tool' -- hermes "\$@"
EOF

chmod +x "$HOME/.local/bin/hermes"

# The desktop app resolves a hermes on PATH by running `hermes --version` with
# a 15 second budget, then falls back to cloning its own copy when that times
# out. A first-run mise install does not fit in 15 seconds, so anything that
# hands Hermes to the GUI has to install it here rather than leave it stubbed.
if [[ $mode == "--now" ]]; then
  "$HOME/.local/bin/hermes" --version
fi