#!/usr/bin/env bash
# sync.sh — Copy telegram-approval-join submodule into internal/, then apply branding patches.
# Usage: ./scripts/sync.sh

set -euo pipefail

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

SUBMODULE_DIR="$ROOT_DIR/telegram-approval-join"
PATCH_FILE="$ROOT_DIR/patches/0001-nuzzles.patch"

# ── 1. Ensure submodule is initialised ────────────────────────────────────────
echo "→ Updating submodule..."

# Capture the submodule commit before update
OLD_COMMIT=$(git -C "$SUBMODULE_DIR" rev-parse HEAD 2>/dev/null || echo "")

# Update the submodule
git -C "$ROOT_DIR" submodule update --init --recursive --remote

# Capture the submodule commit after update
NEW_COMMIT=$(git -C "$SUBMODULE_DIR" rev-parse HEAD 2>/dev/null || echo "")

# Check if there were any changes
# if [[ "$OLD_COMMIT" == "$NEW_COMMIT" ]] && [[ -n "$OLD_COMMIT" ]]; then
#   echo "   Submodule is already up to date. Nothing to do."
#   exit 0
# fi

# ── 2. Wipe and re-copy the submodule source ──────────────────────────────────
echo "→ Copying telegram-approval-join source to root..."
# Clean up directories that will be replaced
rm -rf "$ROOT_DIR/cmd" "$ROOT_DIR/internal" "$ROOT_DIR/Dockerfile" "$ROOT_DIR/go.mod" "$ROOT_DIR/go.sum" "$ROOT_DIR/config.yaml.example"

# Copy source files, excluding .git and keeping patches/ and scripts/
rsync -a --stats --exclude='.git' --exclude='internal/telegram-approval-join' \
  "$SUBMODULE_DIR/" "$ROOT_DIR/" \
  --exclude='patches' --exclude='scripts' --exclude='README.md'

# Remove scripts/ from .gitignore so we can track our sync script
sed -i '/^scripts\/$/d' "$ROOT_DIR/.gitignore"

# ── 3. Rewrite the Go module path inside the copied source ────────────────────
# Change the module from telegram-approval-join to telegram-approval-join-nuzzles
echo "→ Rewriting module path in go.mod ..."
sed -i "s|^module git\.zio\.sh/astra/telegram-approval-join|module git.zio.sh/astra/telegram-approval-join-nuzzles|" "$ROOT_DIR/go.mod"

# Fix all import references in the copied source
echo "→ Rewriting import paths in .go files ..."
find "$ROOT_DIR" -name '*.go' -not -path "*/telegram-approval-join/*" | xargs sed -i 's|git\.zio\.sh/astra/telegram-approval-join|git.zio.sh/astra/telegram-approval-join-nuzzles|g'

# ── 4. Apply branding string patch ────────────────────────────────────────────
if [[ -f "$PATCH_FILE" ]]; then
  echo "→ Applying branding patch ..."
  # Check if patch applies cleanly first (dry run)
  if patch --dry-run -p1 -d "$ROOT_DIR" < "$PATCH_FILE" &>/dev/null; then
    patch -p1 --no-backup-if-mismatch -d "$ROOT_DIR" < "$PATCH_FILE"
    echo "   Patch applied successfully."
  else
    echo ""
    echo "⚠️  Patch did not apply cleanly — telegram-approval-join may have changed."
    echo "   Run the following to see conflicts:"
    echo "     patch --dry-run -p1 -d $ROOT_DIR < $PATCH_FILE"
    echo ""
    echo "   Update patches/0001-nuzzles.patch to match the new source, then re-run sync."
    exit 1
  fi
else
  echo "   No patch file found at patches/0001-nuzzles.patch — skipping."
fi

# ── 5. Verify it builds ───────────────────────────────────────────────────────
echo "→ Verifying build ..."
go build ./... 2>&1 && echo "   Build OK." || { echo "❌ Build failed."; exit 1; }

# ── 6. Commit changes ─────────────────────────────────────────────────────────
echo "→ Committing changes..."
git -C "$ROOT_DIR" add -A
git -C "$ROOT_DIR" commit -m "Update telegram-approval-join submodule and apply branding patches" || true

echo ""
echo "✅ Sync complete. Root directory is up to date with telegram-approval-join (patched)."