#!/usr/bin/env bash
# Master-skill session-start hook
# Injects available masters list into conversation context on session start.
# Compatible with Claude Code, Cursor, and Copilot CLI.

set -euo pipefail

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

# Build masters list from prebuilt/ directory
MASTERS_LIST=""
for dir in "$PLUGIN_ROOT"/prebuilt/*/; do
    [ -d "$dir" ] || continue
    name=$(basename "$dir")
    [ "$name" = "compare" ] && continue
    skill_file="$dir/SKILL.md"
    if [ -f "$skill_file" ]; then
        # Extract lineage from frontmatter
        lineage=$(grep '^lineage:' "$skill_file" 2>/dev/null | head -1 | sed 's/^lineage: *//' || echo "")
        if [ -n "$lineage" ]; then
            MASTERS_LIST="${MASTERS_LIST}  /${name} — ${lineage}\n"
        fi
    fi
done

# Build the context message
CONTEXT="Master-skill plugin loaded. Available Buddhist masters:
${MASTERS_LIST}  /compare-masters — multi-tradition comparison
  /create-master — generate new master from FoJin knowledge graph

All doctrinal responses include CBETA citations linked to fojin.app."

# Escape for JSON embedding
CONTEXT_ESCAPED=$(echo "$CONTEXT" | python3 -c "import sys,json; print(json.dumps(sys.stdin.read()))" 2>/dev/null || echo "\"$CONTEXT\"")

# Platform detection and output format
if [ -n "${CURSOR_PLUGIN_ROOT:-}" ]; then
    # Cursor format
    echo "{\"additional_context\": $CONTEXT_ESCAPED}"
elif [ -n "${CLAUDE_PLUGIN_ROOT:-}" ] && [ -z "${COPILOT_CLI:-}" ]; then
    # Claude Code format
    echo "{\"hookSpecificOutput\": {\"additionalContext\": $CONTEXT_ESCAPED}}"
else
    # Copilot CLI / SDK standard format
    echo "{\"additionalContext\": $CONTEXT_ESCAPED}"
fi