name: Git Repository Mirroring

on:
  workflow_dispatch:
    inputs:
      branches:
        description: 'Comma-separated list of sourceRepo/branch entries to mirror (e.g., dev_Net8.git/Develop_Net8,dev.git/develop). If empty, all entries from branch_list file will be mirrored.'
        required: false
        default: ''
  schedule:
    - cron: '0 2 * * *' # Runs every day at 2:00 AM

jobs:
  mirror:
    runs-on: ubuntu-latest
    timeout-minutes: 360 # 6 hours timeout
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up SSH
        env:
          SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
        run: |
          mkdir -p ~/.ssh
          echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_rsa
          chmod 600 ~/.ssh/id_rsa
          ssh-keyscan -p 22 172.16.42.118 >> ~/.ssh/known_hosts

      - name: Mirror Branches
        env:
          BASE_GITEA_TOKEN: ${{ secrets.BASE_GITEA_TOKEN }}
          BASE_GITEA_URL: ${{ vars.BASE_GITEA_URL }} # e.g., https://gitea.example.com
          BASE_GITEA_USER: ${{ vars.BASE_GITEA_USER }} # The user who owns the token
          INPUT_BRANCHES: ${{ github.event.inputs.branches }}
        run: |
          set -euo pipefail

          CENTER_ORG="center_dev"
          AUTH_HEADER="Authorization: token ${BASE_GITEA_TOKEN}"
          SOURCE_SSH_HOST="engdev@172.16.42.118"

          set_default_branch_main() {
            local repo_name="$1"
            local response http_status body
            response=$(curl -s -w "\n%{http_code}" -X PATCH -H "Content-Type: application/json" -H "${AUTH_HEADER}" -d "{\"default_branch\":\"main\"}" "${BASE_GITEA_URL}/api/v1/repos/${CENTER_ORG}/${repo_name}")
            http_status=$(echo "${response}" | tail -n1)
            body=$(echo "${response}" | sed '$d')

            if [[ "${http_status}" != "200" ]]; then
              echo "::warning::Failed to set default branch to 'main' for ${CENTER_ORG}/${repo_name} (status ${http_status})"
              if [[ -n "${body}" ]]; then
                echo "${body}"
              fi
            else
              echo "Default branch set to 'main' for ${CENTER_ORG}/${repo_name}"
            fi
          }

          process_entry() {
            local entry branch_name source_repo source_repo_url
            entry="$(echo "$1" | xargs)" # trim whitespace

            if [[ -z "$entry" ]]; then
              return
            fi

            if [[ "$entry" != */* ]]; then
              echo "::warning::Entry '${entry}' is missing sourceRepo/branch format. Skipping."
              return
            fi

            source_repo="${entry%%/*}"
            branch_name="${entry#*/}"

            if [[ -z "$source_repo" || -z "$branch_name" ]]; then
              echo "::warning::Invalid entry '${entry}'. Skipping."
              return
            fi

            source_repo_url="${SOURCE_SSH_HOST}:${source_repo}"

            echo "================================================="
            echo "Processing source: ${source_repo} / branch: ${branch_name}"
            
            repo_name="${branch_name}"
            echo "Target repository name: ${repo_name}"

            # Skip if the source branch does not exist or is empty
            branch_ref="$(git ls-remote --heads "${source_repo_url}" "${branch_name}")" || {
              echo "::warning::Failed to query branch '${branch_name}' from source. Skipping."
              return
            }

            if [[ -z "${branch_ref}" ]]; then
              echo "::warning::Branch '${branch_name}' does not exist or is empty on source. Skipping."
              return
            fi

            # Check if repository exists on Gitea
            repo_exists=false
            http_status=$(curl -s -o /dev/null -w "%{http_code}" -H "${AUTH_HEADER}" "${BASE_GITEA_URL}/api/v1/repos/${CENTER_ORG}/${repo_name}")
            
            if [ "${http_status}" == "404" ]; then
              echo "Repository 'center_dev/${repo_name}' does not exist. Creating it..."
              create_tmp="$(mktemp)"
              create_status=$(curl -s -o "${create_tmp}" -w "%{http_code}" -X POST -H "Content-Type: application/json" -H "${AUTH_HEADER}" -d "{\"name\":\"${repo_name}\",\"private\":true,\"default_branch\":\"main\"}" "${BASE_GITEA_URL}/api/v1/orgs/${CENTER_ORG}/repos")
              if [[ "${create_status}" != "201" ]]; then
                echo "::error::Failed to create repository. HTTP ${create_status}"
                cat "${create_tmp}"
                rm -f "${create_tmp}"
                exit 1
              fi
              echo "Repository created successfully."
              repo_exists=true
              rm -f "${create_tmp}"
            elif [ "${http_status}" != "200" ]; then
              echo "::error::Error checking repository. HTTP status: ${http_status}"
              exit 1
            else
              echo "Repository 'center_dev/${repo_name}' already exists."
              repo_exists=true
            fi

            # Define remote URL's hostname, stripping protocol
            GITEA_HOSTNAME=$(echo "${BASE_GITEA_URL}" | sed -e 's~^https*://~~' -e 's~/$~~')
            GITEA_REMOTE="https://${BASE_GITEA_USER}:${BASE_GITEA_TOKEN}@${GITEA_HOSTNAME}/${CENTER_ORG}/${repo_name}.git"
            
            # Create a temporary directory for cloning
            CLONE_DIR=$(mktemp -d)
            echo "Working directory: ${CLONE_DIR}"

            if ${repo_exists}; then
              echo "Cloning existing target repository for update..."
              if ! git clone --mirror "${GITEA_REMOTE}" "${CLONE_DIR}"; then
                echo "::error::Failed to clone existing target repository ${GITEA_REMOTE}"
                rm -rf "${CLONE_DIR}"
                return
              fi
              cd "${CLONE_DIR}"
              git remote add source "${source_repo_url}"
              echo "Fetching latest branch '${branch_name}' from source..."
              if ! git fetch source "+refs/heads/${branch_name}:refs/heads/${branch_name}"; then
                echo "::error::Failed to fetch branch '${branch_name}' from source repo"
                cd ..
                rm -rf "${CLONE_DIR}"
                return
              fi
            else
              echo "Cloning source repository for first-time push..."
              if ! git clone --mirror "${source_repo_url}" "${CLONE_DIR}"; then
                echo "::error::Failed to clone source repository ${source_repo_url}"
                rm -rf "${CLONE_DIR}"
                return
              fi
              cd "${CLONE_DIR}"
            fi

            git remote set-url origin "${GITEA_REMOTE}"
            
            echo "Pushing '${branch_name}' to Gitea repository '${repo_name}'..."
            if ! git push --force origin "refs/heads/${branch_name}:refs/heads/main"; then
              echo "::error::Failed to push branch '${branch_name}' to target repository"
              cd ..
              rm -rf "${CLONE_DIR}"
              return
            fi

            # Cleanup
            cd ..
            rm -rf "${CLONE_DIR}"
            
            echo "Successfully mirrored ${branch_name} to center_dev/${repo_name}"
            set_default_branch_main "${repo_name}"
            echo "================================================="
            echo ""
          }

          if [[ -n "${INPUT_BRANCHES}" ]]; then
            echo "Processing manually specified branches: ${INPUT_BRANCHES}"
            # Split comma-separated string into an array
            IFS=',' read -r -a branches_to_process <<< "${INPUT_BRANCHES}"
            for branch in "${branches_to_process[@]}"; do
              # Trim whitespace
              trimmed_branch=$(echo "$branch" | xargs)
              process_entry "${trimmed_branch}"
            done
          else
            echo "Processing all branches from branch_list file."
            while IFS= read -r branch_name || [[ -n "$branch_name" ]]; do
              process_entry "${branch_name}"
            done < branch_list
          fi