#!/usr/bin/env bash
# Sync the OpenNovelWriter agent pack from this repo into an Obsidian vault.
#
#   sync-to-vault.sh <vault-path>            # dry run: report what differs
#   sync-to-vault.sh <vault-path> --apply    # write, backing up what it replaces
#
# Overwrites ONLY: .opencode/agent/*, .opencode/command/*, .opencode/languages.yaml,
#                  docs/SCHEMA.md, start.sh
# Never touches:   DATA/, AGENTS.md, 01/, Notizen/, Welt/, .obsidian/, the vault's own
#                  .opencode/*.json  (created only if missing)
set -euo pipefail

PACK="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
VAULT="${1:-}"
APPLY="${2:-}"
if [ -z "$VAULT" ] || [ ! -d "$VAULT" ]; then
  echo "usage: $(basename "$0") <vault-path> [--apply]" >&2
  exit 2
fi
if [ "$APPLY" != "" ] && [ "$APPLY" != "--apply" ]; then
  echo "unknown option: $APPLY  (use --apply to write)" >&2
  exit 2
fi

STAMP="$(date +%Y%m%d-%H%M%S)"
BACKUP="$VAULT/.pack-backup/$STAMP"

MANAGED=(
  ".opencode/languages.yaml"
  "docs/SCHEMA.md"
  "start.sh"
  ".opencode/opencode.json"     # created only if missing
)
for d in ".opencode/agent" ".opencode/command"; do
  for f in "$PACK/$d"/*; do
    [ -e "$f" ] && MANAGED+=("$d/$(basename "$f")")
  done
done

md5of() { [ -f "$1" ] && md5 -q "$1" || echo "-"; }

mode="DRY RUN (nothing will be written — add --apply)"
[ "$APPLY" = "--apply" ] && mode="APPLY"
echo "vault : $VAULT"
echo "pack  : $PACK"
echo "mode  : $mode"
echo

same=0; changed=0; missing=0; skipped=0
for rel in "${MANAGED[@]}"; do
  src="$PACK/$rel"; dst="$VAULT/$rel"
  # never clobber an existing instance config
  if [ "$rel" = ".opencode/opencode.json" ] && [ -f "$dst" ]; then
    echo "  keep    $rel (vault's own config preserved)"
    skipped=$((skipped+1)); continue
  fi
  if [ ! -f "$dst" ]; then
    state="new"; missing=$((missing+1))
  elif [ "$(md5of "$src")" = "$(md5of "$dst")" ]; then
    state="same"; same=$((same+1))
  else
    state="UPDATE"; changed=$((changed+1))
  fi
  printf "  %-7s %s\n" "$state" "$rel"
  if [ "$APPLY" = "--apply" ] && [ "$state" != "same" ]; then
    if [ -f "$dst" ]; then
      mkdir -p "$(dirname "$BACKUP/$rel")"
      cp -p "$dst" "$BACKUP/$rel"
    fi
    mkdir -p "$(dirname "$dst")"
    cp -p "$src" "$dst"
  fi
done

echo
echo "identical: $same   to update: $changed   missing: $missing   kept local: $skipped"
if [ "$APPLY" = "--apply" ]; then
  [ -d "$BACKUP" ] && echo "replaced files backed up to: $BACKUP"
  echo "verify with: opencode agent list   (in $VAULT)"
else
  echo "run again with --apply to write these changes"
fi