#!/usr/bin/env bash
# Consolidate accumulated learned lessons: merge duplicates, prune trivia,
# keep only durable rules. Run weekly (manually or via cron). Uses Haiku.
# Fixes the append-only bloat of the session-learning hook.
set -uo pipefail

DIR="$HOME/.claude/skills/learned"
command -v claude >/dev/null 2>&1 || { echo "claude CLI not found on PATH"; exit 1; }

# Gather current consolidated file (if any) + all monthly lesson files.
inputs=$(ls "$DIR"/CONSOLIDATED.md "$DIR"/lessons-*.md 2>/dev/null)
[ -z "$inputs" ] && { echo "nothing to consolidate in $DIR"; exit 0; }
all="$(cat "$DIR"/CONSOLIDATED.md "$DIR"/lessons-*.md 2>/dev/null)"
[ -n "${all//[[:space:]]/}" ] || { echo "no lesson content"; exit 0; }

# Archive originals before rewriting.
mkdir -p "$DIR/archive"
ts="$(date +%Y%m%d-%H%M%S)"
for f in $inputs; do cp "$f" "$DIR/archive/$(basename "$f").$ts.bak"; done

prompt="You are consolidating a developer's accumulated learned lessons from AI
coding sessions. MERGE duplicates and near-duplicates into one rule. DROP anything
trivial, one-off, session-specific, or contradicted. KEEP only durable, reusable
rules (project gotchas, error->fix patterns, workflow rules). Group under
'## <project>' headers (use '## General' for cross-project). Each rule = one
markdown bullet. Do NOT invent anything — only compress what is given. NEVER
include secrets/tokens/PII. Output only the markdown, no preamble.

LESSONS:
$all"

# Uses your logged-in session (slower startup, but authed). Weekly/cron task.
out="$(printf '%s' "$prompt" | timeout 180 claude -p --model haiku 2>/dev/null)"
out="$(printf '%s' "$out" | sed '/^[[:space:]]*$/d')"

# Guard: never overwrite/delete on an error or empty/too-short response.
if printf '%s' "$out" | grep -qiE 'not logged in|/login|error|usage:'; then
  echo "! claude returned an error (not logged in / empty) — originals kept, nothing changed"; exit 1
fi
if [ "$(printf '%s' "$out" | wc -c)" -lt 20 ]; then
  echo "! response too short to be valid — originals kept"; exit 1
fi

if [ -n "$out" ]; then
  { echo "# Learned — consolidated $(date +%Y-%m-%d)"; echo; printf '%s\n' "$out"; } > "$DIR/CONSOLIDATED.md"
  rm -f "$DIR"/lessons-*.md
  echo "✓ consolidated -> $DIR/CONSOLIDATED.md (originals archived in $DIR/archive/)"
  echo "  lines: $(wc -l < "$DIR/CONSOLIDATED.md")"
else
  echo "! Haiku produced no output — originals kept, nothing changed"
fi