#!/usr/bin/env bash
# set-wezterm-profile.sh — SessionStart hook: emit WezTerm theme escape sequence
#
# Derives the profile name from CLAUDE_CONFIG_DIR (e.g. ~/.claude-octopus → octopus)
# and emits a SetUserVar escape sequence so WezTerm fires its user-var-changed
# event and applies the matching theme from wezterm.lua.
#
# Hook subprocesses have no controlling terminal, so the escape sequence is
# written to the pts device found by walking up the process tree.
# Safe in non-WezTerm terminals (escape sequence is silently ignored).
#
# Usage (settings.json):
#   "SessionStart": [{ "hooks": [{ "type": "command",
#     "command": "~/.claude/hooks/set-wezterm-profile.sh" }] }]

set -euo pipefail

profile_dir="${CLAUDE_CONFIG_DIR:-$HOME/.claude}"
profile_name="${profile_dir##*/.claude-}"

# No profile suffix means this is the default profile — nothing to do
if [[ "$profile_name" == "$profile_dir" ]]; then
    exit 0
fi

# Emit the escape sequence to the terminal device.
# Hook subprocesses have no controlling terminal (/dev/tty unavailable),
# so walk up the process tree to find the first ancestor with a pts device.

tty_device=""
pid=$$
while [[ "$pid" -gt 1 ]]; do
    pts=$(ps -o tty= -p "$pid" 2>/dev/null | tr -d ' ')
    if [[ -n "$pts" && "$pts" != "?" && -w "/dev/$pts" ]]; then
        tty_device="/dev/$pts"
        break
    fi
    pid=$(ps -o ppid= -p "$pid" 2>/dev/null | tr -d ' ')
done

if [[ -n "$tty_device" ]]; then
    printf '\e]1337;SetUserVar=%s=%s\a' CLAUDE_PROFILE \
        "$(printf '%s' "$profile_name" | base64)" >"$tty_device" 2>/dev/null || true
fi