#! /usr/bin/env bash

# Don't run directly! Instead, use
# nix run .#create-release

version=${1:-}
if [[ -z "$version" ]]; then
  echo "USAGE: nix run .#create-release -- <version>" >&2
  exit 1
fi

# Check if we're running from the root of the repository
if [[ ! -f "flake.nix" || ! -f "version.nix" ]]; then
  echo "This script must be run from the root of the repository" >&2
  exit 1
fi

# Check if the version matches the semver pattern (without suffixes)
semver_regex="^([0-9]+)\.([0-9]+)\.([0-9]+)$"
if [[ ! "$version" =~ $semver_regex ]]; then
  echo "Version must match the semver pattern (e.g., 1.0.0, 2.3.4)" >&2
  exit 1
fi

if [[ "$(git symbolic-ref --short HEAD)" != "master" ]]; then
  echo "must be on master branch" >&2
  exit 1
fi

# Ensure there are no uncommitted or unpushed changes
uncommited_changes=$(git diff --compact-summary)
if [[ -n "$uncommited_changes" ]]; then
  echo -e "There are uncommited changes, exiting:\n${uncommited_changes}" >&2
  exit 1
fi
git pull git@github.com:nix-community/disko master
unpushed_commits=$(git log --format=oneline origin/master..master)
if [[ "$unpushed_commits" != "" ]]; then
  echo -e "\nThere are unpushed changes, exiting:\n$unpushed_commits" >&2
  exit 1
fi

# Run all tests to ensure we don't release a broken version
# Two workers are safe on systems with at least 16GB of RAM
nix-fast-build --no-link -j 2 --eval-workers 2 --flake .#checks

# Update the version file
cat > version.nix <<EOF
{
  version = "$version";
  released = false;
}
EOF

# Commit and tag the release
git commit -am "release: v$version"
git tag -a "v$version" -m "release: v$version"
git tag -d "latest"
git tag -a "latest" -m "release: v$version"

# a revsion suffix when run from the tagged release commit
echo "{ version = \"$version\"; released = false; }" > version.nix
git commit -am "release: reset released flag"

echo "Release was prepared successfully!"
echo "To push the release, run the following command:"
echo
echo "  git push origin master v$version && git push --force origin latest"
echo
echo "After that, create a release on GitHub:"
echo
echo "  https://github.com/nix-community/disko/releases/new"