#!/usr/bin/env bash
# SessionStart hook for code-guide plugin.
# Reads engineering-principles SKILL.md and injects it as context
# so the 29 foundational principles are always active from turn 1.
#
# Pattern: identical to Superpowers' session-start hook
# which injects skills/using-superpowers/SKILL.md content.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"

skill_content=$(cat "${PLUGIN_ROOT}/skills/engineering-principles/SKILL.md" 2>&1 || echo "Error reading engineering-principles skill")

escape_for_json() {
    local s="$1"
    s="${s//\\/\\\\}"
    s="${s//\"/\\\"}"
    s="${s//$'\n'/\\n}"
    s="${s//$'\r'/\\r}"
    s="${s//$'\t'/\\t}"
    printf '%s' "$s"
}

escaped=$(escape_for_json "$skill_content")
context="<EXTREMELY_IMPORTANT>\nYou have the code-guide plugin loaded. Below is the full content of the 'code-guide:engineering-principles' skill — the 29 foundational rules that apply to every coding decision:\n\n${escaped}\n</EXTREMELY_IMPORTANT>"

if [ -n "${CLAUDE_PLUGIN_ROOT:-}" ]; then
  printf '{"hookSpecificOutput":{"hookEventName":"SessionStart","additionalContext":"%s"}}\n' "$context"
else
  printf '{"additionalContext":"%s"}\n' "$context"
fi

exit 0