session-start

#!/usr/bin/env bash
# session-start with opt-in activation support

set -euo pipefail

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

# Default configuration
SUPERPOWERS_ENABLED=true
INJECTION_MODE="full"
LEGACY_WARNING=""

# ==============================================================================
# Configuration Parsing
# ==============================================================================

# Parse YAML config (simple implementation)
parse_config() {
    local config_file="$1"
    if [ -f "$config_file" ]; then
        # Extract mode
        if grep -q "mode: opt-in" "$config_file"; then
            if [ ! -f "${PROJECT_ROOT}/.superpowers/enabled" ]; then
                SUPERPOWERS_ENABLED=false
            fi
        elif grep -q "mode: never" "$config_file"; then
            SUPERPOWERS_ENABLED=false
        elif grep -q "mode: opt-out" "$config_file"; then
            if [ -f "${PROJECT_ROOT}/.superpowers/disabled" ]; then
                SUPERPOWERS_ENABLED=false
            fi
        fi
        
        # Extract level
        if grep -q "level: lightweight" "$config_file"; then
            INJECTION_MODE="lightweight"
        elif grep -q "level: minimal" "$config_file"; then
            INJECTION_MODE="minimal"
        fi
        
        # Check context-aware settings
        if grep -q "disable_on_main_branch: true" "$config_file"; then
            CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "unknown")
            if [[ "$CURRENT_BRANCH" == "main" || "$CURRENT_BRANCH" == "master" ]]; then
                SUPERPOWERS_ENABLED=false
            fi
        fi
        
        if grep -q "lightweight_on_detached_head: true" "$config_file"; then
            CURRENT_BRANCH=${CURRENT_BRANCH:-$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo "unknown")}
            if [ "$CURRENT_BRANCH" = "HEAD" ] && [ "$INJECTION_MODE" = "full" ]; then
                INJECTION_MODE="lightweight"
            fi
        fi
        
        if grep -q "require_git_repo: true" "$config_file"; then
            if ! git rev-parse --git-dir > /dev/null 2>&1; then
                SUPERPOWERS_ENABLED=false
            fi
        fi
    fi
}

# ==============================================================================
# Check Activation State
# ==============================================================================

# 1. Check global disable file
if [ -f "${HOME}/.superpowers/disabled" ]; then
    SUPERPOWERS_ENABLED=false
fi

# 2. Check configs (layered: plugin defaults → project overrides)
if [ -f "${PLUGIN_ROOT}/lib/config.yaml" ]; then
    parse_config "${PLUGIN_ROOT}/lib/config.yaml"
fi

if [ -f "${PROJECT_ROOT}/.superpowers/config.yaml" ]; then
    parse_config "${PROJECT_ROOT}/.superpowers/config.yaml"
fi

# 3. Check environment variable override (highest priority)
SUPERPOWERS_SESSION_MODE="${SUPERPOWERS_MODE:-}"
if [ -n "$SUPERPOWERS_SESSION_MODE" ]; then
    case "$SUPERPOWERS_SESSION_MODE" in
        enabled|always|opt-out)
            SUPERPOWERS_ENABLED=true
            ;;
        disabled|never)
            SUPERPOWERS_ENABLED=false
            ;;
        opt-in)
            # For opt-in, require explicit .superpowers/enabled
            if [ ! -f "${PROJECT_ROOT}/.superpowers/enabled" ]; then
                SUPERPOWERS_ENABLED=false
            fi
            ;;
        *)
            # Unknown mode, warn but continue
            ;;
    esac
fi

# 4. Legacy skills directory warning
LEGACY_SKILLS_DIR="${HOME}/.config/superpowers/skills"
if [ -d "$LEGACY_SKILLS_DIR" ]; then
    LEGACY_WARNING="\n\n<important-reminder>⚠️ **WARNING:** Superpowers now uses Claude Code's skills system. Custom skills in ~/.config/superpowers/skills will not be read. Move to ~/.claude/skills instead. Remove the directory to dismiss this message.</important-reminder>"
fi

# ==============================================================================
# Context Injection
# ==============================================================================

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"
}

if [ "$SUPERPOWERS_ENABLED" = "true" ]; then
    # Initialize variables
    CONTENT=""
    CONTENT_FILE=""
    
    # Determine which content to inject based on mode
    case "$INJECTION_MODE" in
        full)
            CONTENT_FILE="${PLUGIN_ROOT}/skills/using-superpowers/SKILL.md"
            ;;
        lightweight)
            # Create lightweight content (only core skills)
            CONTENT="<EXTREMELY_IMPORTANT>\nSuperpowers is active in lightweight mode.\n\nCore skills available:\n- brainstorming: Design before implementation\n- using-superpowers: How to use Superpowers\n\nFull workflow (TDD, subagent-driven-development) is disabled.\nEnable with: /superpowers level full\n</EXTREMELY_IMPORTANT>"
            ;;
        minimal)
            CONTENT="<EXTREMELY_IMPORTANT>\nSuperpowers is active in minimal mode.\n\nOnly using-superpowers skill is loaded.\nEnable more: /superpowers level lightweight|full\n</EXTREMELY_IMPORTANT>"
            ;;
    esac
    
    if [ -n "$CONTENT_FILE" ] && [ -f "$CONTENT_FILE" ]; then
        CONTENT=$(cat "$CONTENT_FILE")
    fi
    
    CONTENT="${CONTENT}${LEGACY_WARNING}"
    
else
    # Determine why Superpowers is disabled for accurate notice
    DISABLE_REASON="unknown"
    
    if [ -n "$SUPERPOWERS_SESSION_MODE" ]; then
        DISABLE_REASON="env_var"
    elif [ -f "${HOME}/.superpowers/disabled" ]; then
        DISABLE_REASON="global_disabled"
    elif [ -f "${PROJECT_ROOT}/.superpowers/config.yaml" ] && \
         grep -q "mode: never" "${PROJECT_ROOT}/.superpowers/config.yaml"; then
        DISABLE_REASON="config_never"
    elif grep -q "mode: opt-in" "${PLUGIN_ROOT}/lib/config.yaml" 2>/dev/null; then
        DISABLE_REASON="opt_in"
    fi
    
    # Generate mode-specific notice
    case "$DISABLE_REASON" in
        env_var)
            CONTENT="<SUPERPOWERS_AVAILABLE>\nSuperpowers disabled by environment variable.\n\nTo enable:\n- Unset SUPERPOWERS_MODE or set to 'enabled'\n- Current: SUPERPOWERS_MODE=$SUPERPOWERS_SESSION_MODE\n</SUPERPOWERS_AVAILABLE>"
            ;;
        global_disabled)
            CONTENT="<SUPERPOWERS_AVAILABLE>\nSuperpowers disabled globally.\n\nTo enable:\n- Remove ~/.superpowers/disabled file\n</SUPERPOWERS_AVAILABLE>"
            ;;
        config_never)
            CONTENT="<SUPERPOWERS_AVAILABLE>\nSuperpowers set to 'never' in config.\n\nTo enable:\n- Edit .superpowers/config.yaml and change mode\n</SUPERPOWERS_AVAILABLE>"
            ;;
        opt_in)
            CONTENT="<SUPERPOWERS_AVAILABLE>\nSuperpowers in opt-in mode.\n\nTo enable:\n- Create .superpowers/enabled file\n- Or run: /superpowers on\n</SUPERPOWERS_AVAILABLE>"
            ;;
        *)
            CONTENT="<SUPERPOWERS_AVAILABLE>\nSuperpowers is installed but not active.\n\nTo enable:\n- Create .superpowers/enabled file\n- Or run: /superpowers on\n</SUPERPOWERS_AVAILABLE>"
            ;;
    esac
fi

CONTENT_ESCAPED=$(escape_for_json "$CONTENT")

SESSION_CONTEXT="<EXTREMELY_IMPORTANT>\n${CONTENT_ESCAPED}\n</EXTREMELY_IMPORTANT>"

# Output JSON
cat <<EOF
{
  "additional_context": "${SESSION_CONTEXT}",
  "hookSpecificOutput": {
    "hookEventName": "SessionStart",
    "additionalContext": "${SESSION_CONTEXT}"
  }
}
EOF

exit 0