#!/bin/bash

set -e

# Ensure there's a version number
if [ $# -eq 0 ]; then
  echo "Please specify a SemVer version to publish 'X.Y.Z(-PRERELEASE)(+BUILD)'"
  exit 1
fi

VERSION_NUMBER=$1

# regex taken from: https://github.com/fsaintjacques/semver-tool/blob/master/src/semver
NAT='0|[1-9][0-9]*'
ALPHANUM='[0-9]*[A-Za-z-][0-9A-Za-z-]*'
IDENT="$NAT|$ALPHANUM"
FIELD='[0-9A-Za-z-]+'

SEMVER_REGEX="\
^[vV]?\
($NAT)\\.($NAT)\\.($NAT)\
(\\-(${IDENT})(\\.(${IDENT}))*)?\
(\\+${FIELD}(\\.${FIELD})*)?$"

# Make sure our version is an actual semantic version
if [[ ! $VERSION_NUMBER =~ $SEMVER_REGEX ]]; then
  echo "The version needs to follow a SemVer naming scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'"
  exit 1
fi

# Make sure our working dir is the dir of the publish script
cd $(dirname ${BASH_SOURCE[0]})

echo "Fetching git remotes"
git fetch

if ! git status | grep -q 'On branch master'; then
  echo "Error! Must be on master branch to publish"
  exit 1
fi

if ! git status | grep -q "Your branch is up to date with 'origin/master'."; then
  echo "Error! Must be up to date with origin/master to publish"
  exit 1
fi

if ! git status | grep -q 'working tree clean'; then
  echo "*** Warning: publishing with dirty working tree"
fi

echo "Installing dependencies"
yarn -s install --frozen-lockfile

echo "Building production build"
yarn run build

echo "Giraffe built successfully!"

# Lifted from https://stackoverflow.com/a/3232082/92446
read -r -p "Are you sure you want to publish the build to npm? [y/N] " response
case "$response" in
    [yY][eE][sS]|[yY])
        echo "Tagging and publishing $VERSION_NUMBER release"
        yarn -s publish --$VERSION_NUMBER --access=public

        echo "Pushing git commit and tag"
        git push --follow-tags

        echo "Publish successful!"
        ;;
    *)
        echo "Understandable, have a great day. Exiting without publishing."
        exit 1
        ;;
esac