#!/bin/bash
# Stop hook management for the agent loop.
#
# The Stop hook sends SIGINT to the loop's parent process when a claude session
# finishes. This is how claude signals "I'm done" back to the bash loop —
# the Ralph pattern (ghuntley.com/ralph).
#
# Without this hook, claude would exit to an interactive prompt instead of
# returning control to the loop script.

SETTINGS_FILE="${PROJECT_ROOT}/.claude/settings.local.json"

install_hooks() {
    if [ ! -f "$SETTINGS_FILE" ]; then
        mkdir -p "$(dirname "$SETTINGS_FILE")"
        echo '{}' > "$SETTINGS_FILE"
    fi

    if command -v jq &>/dev/null; then
        jq '.hooks.Stop = [{"matcher": "", "hooks": [{"type": "command", "command": "kill -INT $PPID || true"}]}]' \
            "$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
    else
        python3 -c "
import json, os
p = '$SETTINGS_FILE'
s = json.load(open(p)) if os.path.exists(p) else {}
s.setdefault('hooks', {})['Stop'] = [{'matcher': '', 'hooks': [{'type': 'command', 'command': 'kill -INT \$PPID || true'}]}]
json.dump(s, open(p, 'w'), indent=2)
"
    fi
    log "Stop hook installed"
}

remove_hooks() {
    if [ -f "$SETTINGS_FILE" ]; then
        if command -v jq &>/dev/null; then
            jq 'del(.hooks.Stop)' "$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
            jq 'if .hooks == {} then del(.hooks) else . end' "$SETTINGS_FILE" > "${SETTINGS_FILE}.tmp" && mv "${SETTINGS_FILE}.tmp" "$SETTINGS_FILE"
        else
            python3 -c "
import json
s = json.load(open('$SETTINGS_FILE'))
s.get('hooks', {}).pop('Stop', None)
if not s.get('hooks'): s.pop('hooks', None)
json.dump(s, open('$SETTINGS_FILE', 'w'), indent=2)
"
        fi
        log "Stop hook removed"
    fi
}