#!/bin/bash

if [[ -n "$DEBUG" ]]; then
    set -x
fi

set -euo pipefail

ARCHIVE_EXT='tar.gz'
ARCHIVE_CMD='tar -xf'
GIT_CLIFF_BIN='git-cliff'

case "${RUNNER_OS}" in
    macOS)   
        OS=apple-darwin
        ;;
    Windows) 
        OS=pc-windows-msvc
        ARCHIVE_EXT='zip'
        ARCHIVE_CMD='7z x -aoa'
        GIT_CLIFF_BIN="${GIT_CLIFF_BIN}.exe"
        ;;
    *)
        OS=unknown-linux-gnu
        ;;
esac
case "${RUNNER_ARCH}" in
    ARM64) ARCH=aarch64 ;;
    ARM)   ARCH=pc-windows-msvc ;;
    X86)   ARCH=i686 ;;
    *)     ARCH=x86_64 ;;
esac

INSTALL_DIR="$RUNNER_TEMP/git-cliff"
mkdir -p "$INSTALL_DIR"
cd "$INSTALL_DIR"

echo "git-cliff-${ARCH}-${OS}.${ARCHIVE_EXT}"

RELEASE_URL='https://api.github.com/repos/orhun/git-cliff/releases/latest'
if [[ "${VERSION}" != 'latest' ]]; then
    RELEASE_URL="https://api.github.com/repos/orhun/git-cliff/releases/tags/${VERSION}"
fi
echo "Getting git-cliff ${VERSION} from ${RELEASE_URL}"

# Caching is disabled in order not to receive stale responses from Varnish cache fronting GitHub API.
if [[ -z "${GITHUB_API_TOKEN}" ]]; then
    RELEASE_INFO="$(curl --silent --show-error --fail \
        --header 'Cache-Control: no-cache, must-revalidate' \
        "${RELEASE_URL}")"
else
    # Although releases endpoint is available without authentication, the current github.token is still passed
    # in order to increase the limit of 60 requests per hour per IP address to a higher value that's also counted
    # per GitHub account.
    RELEASE_INFO="$(curl --silent --show-error --fail \
        --header "authorization: Bearer ${GITHUB_API_TOKEN}" \
        --header 'Cache-Control: no-cache, must-revalidate' \
        "${RELEASE_URL}")"
fi

TAG_NAME="$(echo "${RELEASE_INFO}" | jq --raw-output ".tag_name")"
TARGET="git-cliff-${TAG_NAME:1}-${ARCH}-${OS}.${ARCHIVE_EXT}"
LOCATION="$(echo "${RELEASE_INFO}" |
    jq --raw-output ".assets[].browser_download_url" |
    grep "${TARGET}$")"
echo "Found release: ${LOCATION}"

# Create bin directory
mkdir -p ./bin

# Skip downloading release if downloaded already, e.g. when the action is used multiple times.
if [[ ! -e "$TARGET" ]]; then
    echo "Downloading ${TARGET}..."
    curl --silent --show-error --fail --location --output "$TARGET" "$LOCATION"
    echo "Unpacking ${TARGET}..."
    ${ARCHIVE_CMD} "$TARGET"
    mv git-cliff-${TAG_NAME:1}/${GIT_CLIFF_BIN} "./bin/$GIT_CLIFF_BIN"
else
    echo "Using cached git-cliff binary."
fi

echo "git-cliff is ready to use!"