#!/usr/bin/env bash
# SessionStart hook for superpowers plugin (Factory Droid edition)

set -euo pipefail

# Determine plugin root directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]:-$0}")" && pwd)"
PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"

# Check if legacy skills directory exists and build warning
warning_message=""
legacy_skills_dir="${HOME}/.config/superpowers/skills"
if [ -d "$legacy_skills_dir" ]; then
    warning_message="\n\n<important-reminder>IN YOUR FIRST REPLY AFTER SEEING THIS MESSAGE YOU MUST TELL THE USER:⚠️ **WARNING:** Superpowers now uses Droid's skills system. Custom skills in ~/.config/superpowers/skills will not be read. Move custom skills to ~/.factory/skills instead. To make this message go away, remove ~/.config/superpowers/skills</important-reminder>"
fi

# Read using-superpowers content
using_superpowers_content=$(cat "${PLUGIN_ROOT}/skills/using-superpowers/SKILL.md" 2>&1 || echo "Error reading using-superpowers skill")

# Escape string for JSON embedding using bash parameter substitution.
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"
}

using_superpowers_escaped=$(escape_for_json "$using_superpowers_content")
warning_escaped=$(escape_for_json "$warning_message")
session_context="<EXTREMELY_IMPORTANT>\nYou have superpowers.\n\n**Below is the full content of your 'superpowers:using-superpowers' skill - your introduction to using skills. For all other skills, use the '/skills' command or let them auto-activate based on your task:**\n\n${using_superpowers_escaped}\n\n${warning_escaped}\n</EXTREMELY_IMPORTANT>"

# Output context injection as JSON.
# Droid hooks expect hookSpecificOutput.additionalContext (same as Claude Code).
# We detect the platform via DROID_PLUGIN_ROOT or CLAUDE_PLUGIN_ROOT.
if [ -n "${DROID_PLUGIN_ROOT:-}" ]; then
  # Factory Droid sets DROID_PLUGIN_ROOT — emit hookSpecificOutput
  cat <<EOF
{
  "hookSpecificOutput": {
    "hookEventName": "SessionStart",
    "additionalContext": "${session_context}"
  }
}
EOF
elif [ -n "${CLAUDE_PLUGIN_ROOT:-}" ]; then
  # Claude Code fallback (in case this fork is used with CC)
  cat <<EOF
{
  "hookSpecificOutput": {
    "hookEventName": "SessionStart",
    "additionalContext": "${session_context}"
  }
}
EOF
else
  # Other platforms — emit additional_context
  cat <<EOF
{
  "additional_context": "${session_context}"
}
EOF
fi

exit 0