#!/bin/bash

set -euxo pipefail

script_dir=$(dirname "$0")
# shellcheck source=test/common.sh
source "$script_dir/common.sh"

function set_author_name() {
  local repo
  repo=$1
  pushd "$repo"
  # TODO(kaihowl)
  # Only setting the values with envvars fails for libgit2 git_signature_default
  git config user.name "$GIT_COMMITTER_NAME"
  git config user.email "$GIT_COMMITTER_EMAIL"
  popd
}

# When run, creates and changes into a temp folder with the following structure:
# - original/  # bare, upstream repo
# - repo1/     # First working copy
# - repo2/     # Second working copy
function bare_repo_and_two_clones() {
  cd "$(mktemp -d)"
  mkdir original
  cd original
  git init --bare
  cd ..

  git clone original repo1
  set_author_name repo1

  git clone original repo2
  set_author_name repo2
}

echo ---- Test case 1: Conflicting on single commit.

echo Setup both working copies to have a single shared, upstream commit, which already has a single measurement on it
bare_repo_and_two_clones
pushd repo1
create_commit
git perf add -m echo 0.5 -k repo=original
git push
git perf push
popd
pushd repo2
git pull
popd


echo In first working copy, add a perf measurement, but do not push it
pushd repo1
git perf pull
git perf add -m echo 0.5 -k repo=first
popd

echo In the second working copy, also add a perf measurement to cause a conflict
pushd repo2
git perf pull
git perf add -m echo 0.5 -k repo=second
popd

echo Then push from first working copy
pushd repo1
git perf push
popd

echo Pushing in second working copy should automatically pull and reconcile
pushd repo2
git perf push
git perf report -o -
num_measurements=$(git perf report -o - | wc -l)
[[ ${num_measurements} -eq 3 ]] || exit 1
popd

echo In the first working copy, we should see all three measurements now
pushd repo1
git perf pull
num_measurements=$(git perf report -o - | wc -l)
[[ ${num_measurements} -eq 3 ]] || exit 1
popd

echo ---- Test case 2: No conflicts but merge needed.

echo Setup empty upstream
bare_repo_and_two_clones

echo In first working copy, add a commit with a perf measurement, publish commit and perf
pushd repo1
create_commit
git perf add -m echo 0.5 -k repo=first
git push
git perf push
popd

echo "In the second working copy, pull (without perf), add commit with perf, publish commit and perf"
pushd repo2
git pull
create_commit
git perf add -m echo 0.5 -k repo=second
num_measurements=$(git perf report -o - | wc -l)
[[ ${num_measurements} -eq 1 ]] || exit 1
git push
# There is a conflict, it should automatically pull first
git perf push
num_measurements=$(git perf report -o - | wc -l)
[[ ${num_measurements} -eq 2 ]] || exit 1
popd

echo In the first working copy, we should also see both measurements on separate commits now
pushd repo1
git pull
git perf pull
num_measurements=$(git perf report -o - | wc -l)
[[ ${num_measurements} -eq 2 ]] || exit 1
popd


exit 0