#!/bin/sh
# Repo Manager coding-assistant provenance hook. This hook must never block Git.

message_file=${1:-}
[ -n "$message_file" ] && [ -f "$message_file" ] || exit 0

assistant=${ASSISTANT_NAME:-}
model=${ASSISTANT_MODEL:-}
process=${ASSISTANT_PROCESS:-}
session=${ASSISTANT_SESSION:-}

if [ -z "$assistant" ] && { [ "${CLAUDECODE:-}" = "1" ] || [ -n "${CLAUDE_CODE_SESSION_ID:-}" ]; }; then
    assistant=claude-code
    session=${session:-${CLAUDE_CODE_SESSION_ID:-}}
    process=${process:-${CLAUDE_PID:-}}
fi

if [ -z "$assistant" ] && { [ -n "${CODEX_SESSION_ID:-}" ] || [ -n "${CODEX_THREAD_ID:-}" ]; }; then
    assistant=codex
    session=${session:-${CODEX_SESSION_ID:-${CODEX_THREAD_ID:-}}}
    process=${process:-${CODEX_PID:-}}
fi

if [ -z "$assistant" ] && { [ -n "${GROK_SESSION_ID:-}" ] || [ "${GROKCODE:-}" = "1" ] || [ "${GROK_CODE:-}" = "1" ]; }; then
    assistant=grok
    session=${session:-${GROK_SESSION_ID:-}}
    process=${process:-${GROK_PID:-}}
fi

[ -n "$assistant" ] || exit 0

if [ -z "$model" ] && [ "$assistant" = "claude-code" ]; then
    claude_settings=${CLAUDE_SETTINGS_PATH:-${HOME:-}/.claude/settings.json}
    if [ -f "$claude_settings" ]; then
        model=$(sed -n 's/^[[:space:]]*"model"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' "$claude_settings" 2>/dev/null | head -1)
    fi
fi

if [ -z "$model" ] && [ "$assistant" = "codex" ]; then
    codex_config=${CODEX_HOME:-${HOME:-}/.codex}/config.toml
    if [ -f "$codex_config" ]; then
        model=$(sed -n 's/^[[:space:]]*model[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p' "$codex_config" 2>/dev/null | head -1)
    fi
fi

if [ -z "$model" ] && [ "$assistant" = "grok" ]; then
    model=${GROK_DEFAULT_MODEL:-}
fi

if [ -n "$process" ]; then
    case "$process" in
        *@*) : ;;
        *) process="$process@$(hostname 2>/dev/null || printf unknown-host)" ;;
    esac
fi

have_assistant_trailer=0
if grep -Eiq '^Assistant(-Model|-Process|-Session)?:[[:space:]]*' "$message_file" 2>/dev/null; then
    have_assistant_trailer=1
fi

add_trailer() {
    token=$1
    value=$2
    [ -n "$value" ] || return 0
    grep -Eiq "^${token}:[[:space:]]*" "$message_file" 2>/dev/null && return 0
    if [ "$have_assistant_trailer" -eq 0 ]; then
        printf '\n' >>"$message_file" 2>/dev/null || return 0
        have_assistant_trailer=1
    fi
    printf '%s: %s\n' "$token" "$value" >>"$message_file" 2>/dev/null || true
}

add_trailer Assistant "$assistant"
add_trailer Assistant-Model "$model"
add_trailer Assistant-Process "$process"
add_trailer Assistant-Session "$session"
exit 0