#!/usr/bin/env bash
#
# Copyright 2021 The terraform-docs Authors.
#
# Licensed under the MIT license (the "License"); you may not
# use this file except in compliance with the License.
#
# You may obtain a copy of the License at the LICENSE file in
# the root directory of this source tree.

set -o errexit
set -o pipefail

if [ -n "$(git status --short)" ]; then
    echo "Error: There are untracked/modified changes, commit or discard them before the release."
    exit 1
fi

RELEASE_FULL_VERSION=${1//v/}
CURRENT_FULL_VERSION=${2//v/}
FROM_MAKEFILE=$3

if [ -z "${RELEASE_FULL_VERSION}" ]; then
    if [ -z "${FROM_MAKEFILE}" ]; then
        echo "Error: VERSION is missing. e.g. ./release.sh <version>"
    else
        echo "Error: missing value for 'version'. e.g. 'make release VERSION=x.y.z'"
    fi
    exit 1
fi

if [ -z "${CURRENT_FULL_VERSION}" ]; then
    COMMIT_HASH=$(git rev-parse --short HEAD 2>/dev/null)
    CURRENT_FULL_VERSION=$(git describe --tags --exact-match 2>/dev/null || git describe --tags 2>/dev/null || echo "v0.0.1-${COMMIT_HASH}")
fi
CURRENT_FULL_VERSION=${CURRENT_FULL_VERSION//v/}

if [ "${RELEASE_FULL_VERSION}" == "${CURRENT_FULL_VERSION}" ]; then
    echo "Error: provided version (v${RELEASE_FULL_VERSION}) already exists."
    exit 1
fi

if [ "$(git describe --tags "v${RELEASE_FULL_VERSION}" 2>/dev/null)" ]; then
    echo "Error: provided version (v${RELEASE_FULL_VERSION}) already exists."
    exit 1
fi

# get closest GA tag, ignore alpha, beta and rc tags
function getClosestVersion() {
    for t in $(git tag --sort=-creatordate); do
        tag="$t"
        if [[ "$tag" == *"-alpha"* ]] || [[ "$tag" == *"-beta"* ]] || [[ "$tag" == *"-rc"* ]]; then
            continue
        fi
        break
    done
    echo "${tag//v/}"
}
CLOSEST_VERSION=$(getClosestVersion)

echo "Release Version: v${RELEASE_FULL_VERSION}"
echo "Closest Version: v${CLOSEST_VERSION}"

RELEASE_VERSION=$(echo $RELEASE_FULL_VERSION | cut -d"-" -f1)
RELEASE_IDENTIFIER=$(echo $RELEASE_FULL_VERSION | cut -d"-" -f2)

if [[ $RELEASE_VERSION == $RELEASE_IDENTIFIER ]]; then
    RELEASE_IDENTIFIER=""
fi

# Set the released version in README and installation.md
if [[ $RELEASE_IDENTIFIER == "" ]]; then
    sed -i -E "s|${CLOSEST_VERSION}|${RELEASE_VERSION}|g" ../../README.md
    sed -i -E "s|${CLOSEST_VERSION}|${RELEASE_VERSION}|g" ../../docs/user-guide/installation.md

    echo "Modified: README.md"
    echo "Modified: docs/user-guide/installation.md"
fi

# Set the released version and identifier in version.go
sed -i -E "s|coreVersion([[:space:]]*)= \"(.*)\"|coreVersion\1= \"${RELEASE_VERSION}\"|g" ../../internal/version/version.go
sed -i -E "s|prerelease([[:space:]]*)= \"(.*)\"|prerelease\1= \"${RELEASE_IDENTIFIER}\"|g" ../../internal/version/version.go

echo "Modified: internal/version/version.go"