#!/bin/bash

PROJECT=${1}
PATCH=${2}
BRANCH=${3:-master}

if [[ ${PATCH} =~ ^https://review.opendev.org ]]; then
  FORMAT=gerrit
  PATCH_ID=$(echo ${PATCH} | awk -F/ '{print $NF}')
elif [[ ${PATCH} =~ ^https://github.com ]]; then
  FORMAT=github
  PATCH_ID=$(echo ${PATCH} | awk -F/ '{print $NF}')
else
  # Exit if we don't know how to handle this patch
  echo "Unknown patch format: ${PATCH}"
  exit 1
fi

# Clone the repository in a temporary directory if it doesn't exist
if [ ! -d "/tmp/vexxhost-${PROJECT}" ]; then
  gh repo clone vexxhost/${PROJECT} /tmp/vexxhost-${PROJECT}
fi

# Switch to the repository
cd /tmp/vexxhost-${PROJECT}

# Update the repository
git fetch origin

# Switch to the branch that we're cherry-picking into
git checkout -B patch/${BRANCH}/${PATCH_ID} origin/${BRANCH}

# Cherry-pick the change
if [[ ${FORMAT} == "gerrit" ]]; then
  LATEST_REV=$(git ls-remote https://opendev.org/openstack/${PROJECT} | grep -E "refs/changes/[[:digit:]]+/${PATCH_ID}/" | sort -t / -k 5 -g | tail -n1 | awk '{print $2}')
  git fetch https://review.opendev.org/openstack/${PROJECT} ${LATEST_REV} && git cherry-pick FETCH_HEAD
elif [[ ${FORMAT} == "github" ]]; then
  gh pr checkout --branch patch/${BRANCH}/${PATCH_ID} -f ${PATCH}
fi

# Push this branch to the remote
git push -u origin patch/${BRANCH}/${PATCH_ID}

# Create a PR for this change
gh repo set-default vexxhost/${1}
gh pr create \
  --title "$(git show -s --format=%s)" \
  --body "$(git show -s --format=%B)" \
  --base ${BRANCH} \
  --head patch/${BRANCH}/${PATCH_ID}