#!/bin/bash

#if [ $# -ne 2 ]; then
#	  echo "Usage: $0 <SOURCE_REPO_URL> <TARGET_REPO_URL>"
#	    exit 1
#fi

SOURCE_REPO="$1"
TARGET_REPO="$2"
REPO_NAME=$(basename "$SOURCE_REPO" .git)

# ==============================
# ?? 全局 Git 配置：提升大文件支持
# ==============================
echo "?? Increasing Git buffer and timeout settings..."
git config --global http.postBuffer 1048576000    # 1 GB
git config --global https.postBuffer 1048576000   # 1 GB
git config --global http.lowSpeedLimit 0
git config --global http.lowSpeedTime 999999
git config --global core.compression 1            # 减少 CPU 压力（可选）

echo "Cloning from $SOURCE_REPO (mirror)..."
git clone --mirror "$SOURCE_REPO"
if [ ! -d "${REPO_NAME}.git" ]; then
	  echo "? Error: Clone failed or directory '${REPO_NAME}.git' not found."
	    exit 1
fi

cd "${REPO_NAME}.git"

# 初始化 LFS
echo "Initializing Git LFS..."
git lfs install --local

# 拉取所有 LFS 对象
echo "Fetching all LFS objects from source..."
GIT_LFS_SKIP_SMUDGE=1 git lfs fetch origin --all || {
	  echo "?? LFS fetch failed. Retrying once..."
  sleep 3
    GIT_LFS_SKIP_SMUDGE=1 git lfs fetch origin --all || {
	        echo "? LFS fetch failed after retry."
        exit 1
	  }
}

# 设置目标远程
echo "Setting new remote origin to $TARGET_REPO ..."
git remote set-url origin "$TARGET_REPO"
git config remote.origin.mirror false

# ==============================
# ?? 安全推送策略：先推 HEAD（main/master），再推全部
# ==============================
echo "Pushing initial branch (HEAD) to establish base ref..."

# 尝试推 HEAD 到 main 或 master（Git 2.30+ 支持）
if git push --force origin HEAD:main 2>/dev/null; then
	  echo "? Pushed to 'main' branch."
  elif git push --force origin HEAD:master 2>/dev/null; then
	    echo "? Pushed to 'master' branch."
    else
	      # 如果 HEAD 推送失败，尝试列出所有本地分支并推第一个
	        FIRST_BRANCH=$(git branch -r | head -1 | sed 's|origin/||')
		  if [ -n "$FIRST_BRANCH" ]; then
			      echo "Trying to push first detected branch: $FIRST_BRANCH"
			          git push --force origin "refs/heads/$FIRST_BRANCH:refs/heads/$FIRST_BRANCH" || {
					        echo "? Failed to push any initial branch."
				        exit 1
					    }
				      else
					          echo "?? No branches detected. Falling back to --all (may fail on empty remote)."
						    fi
fi

# 推送所有分支和标签
echo "Pushing all branches and tags..."
git push --all --force origin || {
	  echo "? Failed to push all branches."
  exit 1
}
git push --tags --force origin || {
	  echo "? Failed to push tags."
  exit 1
}

# 推送 LFS 对象
echo "Pushing LFS objects to target repository..."
git lfs push --all origin || {
	  echo "? LFS push failed."
  exit 1
}

# ==============================
# ? 验证：检查远程是否有 refs
# ==============================
echo "Verifying remote repository content..."
if ! git ls-remote --heads origin | grep -q .; then
	  echo "? ERROR: Remote repository appears empty! Push may have failed silently."
	    exit 1
fi

echo "? Migration succeeded! Repository is now available at $TARGET_REPO"
#rm -fr *.git