#!/usr/bin/env bash
# SessionStart hook for brooks-lint plugin
# Injects lightweight awareness of brooks-lint into every Claude session.

set -euo pipefail

# Auto-install short-form commands to ~/.claude/commands/
# Plugin skills register as /brooks-lint:brooks-review etc.
# These wrappers enable /brooks-review (no namespace prefix).
# Versioned sentinel ensures files refresh on plugin upgrade.
cmd_dir="$HOME/.claude/commands"
plugin_dir="$(cd "$(dirname "$0")/.." && pwd)"
version="$(sed -n 's/.*"version": "\(.*\)".*/\1/p' "$plugin_dir/package.json" | head -n 1)"
if [ -z "$version" ]; then
    echo "Failed to read version from package.json" >&2
    exit 1
fi
sentinel="$cmd_dir/.brooks-lint-v${version}"

if [ ! -f "$sentinel" ]; then
    mkdir -p "$cmd_dir"
    cp "$plugin_dir"/commands/brooks-*.md "$cmd_dir/"
    # Clean up old sentinel files and write current version
    rm -f "$cmd_dir"/.brooks-lint-v* "$cmd_dir"/.brooks-lint-installed
    touch "$sentinel"
fi

# The context injected must be SHORT (<150 words).
# Do NOT inject the full SKILL.md — it loads on demand via the Skill tool.
context="You have the brooks-lint plugin installed. It provides six independent skills — load the relevant one via the Skill tool:
  brooks-lint:brooks-review  → PR code review
  brooks-lint:brooks-audit   → Architecture audit
  brooks-lint:brooks-debt    → Tech debt assessment
  brooks-lint:brooks-test    → Test quality review
  brooks-lint:brooks-health  → Codebase health dashboard
  brooks-lint:brooks-sweep   → Full sweep: analyse all dimensions and auto-fix findings

Triggers when the user asks to review code, discuss architecture, assess tech debt, or discuss test quality. Also triggers when the user mentions: Brooks's Law / Mythical Man-Month / conceptual integrity / second system effect / Hyrum's Law / deep modules / tactical programming / code smells / refactoring / clean architecture / DDD."

# Escape for JSON embedding
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"
}

context_escaped=$(escape_for_json "$context")

# Output format differs by platform
if [ -n "${CURSOR_PLUGIN_ROOT:-}" ]; then
    printf '{\n  "additional_context": "%s"\n}\n' "$context_escaped"
elif [ -n "${CLAUDE_PLUGIN_ROOT:-}" ]; then
    printf '{\n  "hookSpecificOutput": {\n    "hookEventName": "SessionStart",\n    "additionalContext": "%s"\n  }\n}\n' "$context_escaped"
else
    printf '{\n  "additional_context": "%s"\n}\n' "$context_escaped"
fi

exit 0