#!/usr/bin/env bash

# safety checks
if [[ $# -ne 1 ]]; then
    echo "usage: $0 <major|minor|patch>" >&2
    exit 1
fi
if [[ "$(git rev-parse --abbrev-ref HEAD)" != 'master' ]]; then
    echo "not on the master branch" >&2
    exit 1
fi

# get latest and check if clean
git pull
if [[ -n "$(git status --porcelain)" ]]; then
    echo "working directory is dirty" >&2
    exit 1
fi

# get the current verison from last git tag into array and
# inc the provided part
semver_expression='s/^v([0-9]+)\.([0-9]+)\.([0-9]+).*$/\1 \2 \3/'
version=( $(git describe --tags | sed -E -e "$semver_expression" ) )
case "$1" in
    major)
        ((version[0]++))
	version[1]=0
	version[2]=0
        ;;
    minor)
        ((version[1]++))
	version[2]=0
        ;;
    patch)
        ((version[2]++))
        ;;
    *)
        echo 'please provide a valid version in increment' >&2
        exit 1
esac
new_version="v${version[0]}.${version[1]}.${version[2]}"

# write version to go
mkdir version >/dev/null 2>&1
cat > version/version.go  << EOL
// generated by \`_do_bump_version\` script in project root
// $(date)
// DO NOT EDIT

package version

const NAME = "gonic"
const NAME_UPPER = "GONIC"
const NAME_EMBED = "gonicembed"
const VERSION = "$new_version"
EOL

./_do_gen_handler_tests

# create and tag single commit with a change to the version file
git commit --all --file - << EOL
bump to $new_version

generated by \`_do_bump_version\` script in project root
EOL
git tag "$new_version"

echo "commited and tagged"
echo "remember to push tags"