#!/bin/bash

# Script to backup git repo(s) to Backblaze B2

script_name="$(basename "${0}")"

# Usage
read -r -d '' __usage <<-'EOF' || true
Usage: backup-git-repos-to-b2 [options] repo(s)...

Options:
  -b --b2-bucket       [arg] Backblaze B2 bucket name. Required.
  -i --b2-id           [arg] Backblaze B2 account ID. Required.
  -k --b2-key          [arg] Backblaze B2 application key. Required.
  -g --github-account  [arg] GitHub account name. Required.
  -t --temp-dir        [arg] Dir to use for temp files.

  -h --help            This page.
EOF

# Help text
__helptext='NOTE: --temp-dir defaults to "$(mktemp -d)" if not specified.'

source bash3boilerplate/main.sh

b2_bucket="${arg_b}"
b2_cmd="b2"
b2_id="${arg_i}"
b2_key="${arg_k}"
date="$(date '+%F_%H%M%z')"
github_account="${arg_g}"
temp_dir="${arg_t:-}"
if [[ "$temp_dir" == "" ]]; then
    temp_dir="$(mktemp -d)"
fi

# Check for backblaze-b2
# Check for b2 cmd
if which backblaze-b2 >/dev/null 2>&1; then
    # Arch Linux uses this name
    b2_cmd="backblaze-b2"
elif ! which b2 > /dev/null 2>&1; then
    echo "Error B2 command-line tool not found"
    exit 1
fi

# Setup repository to ${1}
repository="${1}"
if [[ "${repository: -4:4}" == ".git" ]]; then
    repository="${repository:0: -4}"
fi

# Create the backup directory
mkdir -p "${temp_dir}"
pushd "${temp_dir}" > /dev/null

echo "Backing up ${repository}"

git clone --mirror --verbose \
    "https://github.com/${github_account}/${repository}.git" \
    "${repository}-${date}.git"
if [ $? -ne 0 ]; then
    echo "Error cloning ${repository}"
    exit 1
fi

tar cpzf "${repository}-${date}.git.tgz" "${repository}-${date}.git"
if [ $? -ne 0 ]; then
    echo "Error compressing ${repository}"
    exit 1
fi

# Authorize B2 account
"${b2_cmd}" authorize-account "${b2_id}" "${b2_key}"
if [ $? -ne 0 ]; then
    echo "Error authorizing Backblaze B2 account"
    exit 1
fi

if [[ -f "${repository}-${date}.git.tgz" ]]; then
    "${b2_cmd}" upload-file "${b2_bucket}" \
        "${repository}-${date}.git.tgz" \
        "${github_account}/${repository}-${date}.git.tgz"
fi

if [ $? -ne 0 ]; then
    echo "Error uploading ${repository} to Backblaze B2"
    exit 1
fi

#delete tar file and checked out folder
/bin/rm "${temp_dir}/${repository}-${date}.git.tgz"
/bin/rm -rf "${temp_dir}/${repository}-${date}.git"
if [ $? -ne 0 ]; then
    echo "Error removing temp files"
    exit 1
fi

popd > /dev/null
echo "Succesfully backed up ${repository}"