#!/usr/bin/env bash
# sweep.sh — Echo6 Vault Engine daily maintenance sweep
#
# Invoked by cron (schedule: "0 9 * * *" from config.yaml).
# Also callable manually: ./sweep.sh
#
# What this does (when fully implemented):
#   1. GPU-busy guard: check VRAM usage; defer if > defer_if_gpu_busy_mib (6000 MiB default)
#   2. Run lint (lib/lint.py) over all vault docs — fix or flag frontmatter issues
#   3. Run agent (lib/agent.py) over changed/new docs since last run — tag + embed
#   4. Append a summary entry to changelog.md
#
# Configuration is read from config.yaml (engine_dir, vault_dir, thresholds, changelog path).

set -euo pipefail

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

echo "==> Echo6 vault sweep — $(date -u '+%Y-%m-%dT%H:%M:%SZ')"

# ---------------------------------------------------------------------------
# Step 1 — GPU-busy guard
# ---------------------------------------------------------------------------
# TODO: Query nvidia-smi for used VRAM; compare to defer_if_gpu_busy_mib from config.yaml.
# If busy, log a deferred entry to changelog and exit 0 (not an error, just deferred).
#
# Example skeleton:
#   USED_MIB=$(nvidia-smi --query-gpu=memory.used --format=csv,noheader,nounits | head -1)
#   THRESHOLD=6000  # read from config.yaml
#   if [ "$USED_MIB" -gt "$THRESHOLD" ]; then
#       echo "GPU busy (${USED_MIB} MiB > ${THRESHOLD} MiB threshold) — deferring sweep."
#       exit 0
#   fi

echo "[1/4] TODO — GPU-busy guard not yet implemented."

# ---------------------------------------------------------------------------
# Step 2 — Run lint
# ---------------------------------------------------------------------------
# TODO: Call lib/lint.py to validate/fix frontmatter across vault docs.
# Lint should be idempotent and log all changes to changelog.
#
#   python3 "${SCRIPT_DIR}/lib/lint.py" --config "${CONFIG}"

echo "[2/4] TODO — lint.py not yet implemented (Step 2)."

# ---------------------------------------------------------------------------
# Step 3 — Run agent over changed/new docs
# ---------------------------------------------------------------------------
# TODO: Call lib/agent.py to tag + embed documents modified since last sweep.
# Agent tracks last-run timestamp in a state file (e.g. engine/.last_sweep).
#
#   python3 "${SCRIPT_DIR}/lib/agent.py" --config "${CONFIG}"

echo "[3/4] TODO — agent.py not yet implemented (Step 5)."

# ---------------------------------------------------------------------------
# Step 4 — Append changelog summary
# ---------------------------------------------------------------------------
# TODO: agent.py and lint.py both append to changelog.md directly.
# This step adds a sweep-level summary entry.

echo "[4/4] TODO — changelog summary not yet implemented."

echo "==> sweep.sh done."