#!/usr/bin/env bash
# sync-best-practices.sh — Sync best-practices/ from skynet/best-practices repo
# Usage: scripts/sync-best-practices.sh [--dry-run]
set -euo pipefail

REPO_URL="https://gitea.oreillyit.nz/skynet/best-practices.git"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
BP_DIR="$REPO_ROOT/best-practices"
BESTPRACTICES_MD="$REPO_ROOT/BESTPRACTICES.md"
DRY_RUN=false

if [[ "${1:-}" == "--dry-run" ]]; then
  DRY_RUN=true
  echo "[dry-run] No changes will be written or committed"
fi

TMPDIR="$(mktemp -d)"
trap 'rm -rf "$TMPDIR"' EXIT

echo "Cloning $REPO_URL ..."
git clone --depth=1 "$REPO_URL" "$TMPDIR/best-practices"

# Copy all .md files from the source repo into best-practices/
echo "Copying .md files to $BP_DIR ..."
if ! $DRY_RUN; then
  find "$TMPDIR/best-practices" -maxdepth 1 -name "*.md" -exec cp {} "$BP_DIR/" \;
  # Also copy subdirectory .md files preserving structure
  find "$TMPDIR/best-practices" -mindepth 2 -name "*.md" | while read -r src; do
    rel="${src#$TMPDIR/best-practices/}"
    dest="$BP_DIR/$rel"
    mkdir -p "$(dirname "$dest")"
    cp "$src" "$dest"
  done
else
  echo "[dry-run] Would copy:"
  find "$TMPDIR/best-practices" -name "*.md" | sed "s|$TMPDIR/best-practices/||"
fi

# Update BESTPRACTICES.md topic list from INDEX.md, preserving the redirect header
INDEX_MD="$TMPDIR/best-practices/INDEX.md"
if [[ -f "$INDEX_MD" ]]; then
  echo "Updating $BESTPRACTICES_MD topic list from INDEX.md ..."
  if ! $DRY_RUN; then
    # Extract the redirect header (everything up to and including the first blank line after the blockquote)
    HEADER=$(awk '/^> \*\*Note:\*\*/{found=1} found{print} found && /^$/{exit}' "$BESTPRACTICES_MD")
    if [[ -z "$HEADER" ]]; then
      # Fallback: preserve first 4 lines (the note block)
      HEADER=$(head -4 "$BESTPRACTICES_MD")
    fi

    # Write header + blank line + INDEX.md content
    {
      echo "$HEADER"
      echo ""
      cat "$INDEX_MD"
    } > "$BESTPRACTICES_MD"
  else
    echo "[dry-run] Would update $BESTPRACTICES_MD from INDEX.md"
  fi
else
  echo "No INDEX.md found in source repo — skipping BESTPRACTICES.md update"
fi

# Commit if there are changes
if ! $DRY_RUN; then
  cd "$REPO_ROOT"
  if git diff --quiet && git diff --cached --quiet; then
    echo "No changes to commit."
  else
    git add best-practices/ BESTPRACTICES.md
    git commit -m "Sync best-practices from skynet/best-practices"
    echo "Committed sync changes."
  fi
fi

echo "Done."