#!/usr/bin/env bash

# This script is used to download built dashboard assets from the "GreptimeTeam/dashboard" repository.

set -e -x

declare -r SCRIPT_DIR=$(cd $(dirname ${0}) >/dev/null 2>&1 && pwd)
declare -r ROOT_DIR=$(dirname ${SCRIPT_DIR})
declare -r STATIC_DIR="$ROOT_DIR/src/servers/dashboard"
OUT_DIR="${1:-$SCRIPT_DIR}"

RELEASE_VERSION="$(cat $STATIC_DIR/VERSION | tr -d '\t\r\n ')"

echo "Downloading assets to dir: $OUT_DIR"
cd $OUT_DIR
# Download the SHA256 checksum attached to the release. To verify the integrity
# of the download, this checksum will be used to check the download tar file
# containing the built dashboard assets.
curl -Ls https://github.com/GreptimeTeam/dashboard/releases/download/$RELEASE_VERSION/sha256.txt --output sha256.txt

# Download the tar file containing the built dashboard assets.
curl -L https://github.com/GreptimeTeam/dashboard/releases/download/$RELEASE_VERSION/build.tar.gz --output build.tar.gz

# Verify the checksums match; exit if they don't.
case "$(uname -s)" in
    FreeBSD | Darwin)
        echo "$(cat sha256.txt)" | shasum --algorithm 256 --check \
            || { echo "Checksums did not match for downloaded dashboard assets!"; exit 1; } ;;
    Linux)
        echo "$(cat sha256.txt)" | sha256sum --check -- \
            || { echo "Checksums did not match for downloaded dashboard assets!"; exit 1; } ;;
    *)
        echo "The '$(uname -s)' operating system is not supported as a build host for the dashboard" >&2
        exit 1
esac

# Extract the assets and clean up.
tar -xzf build.tar.gz -C "$STATIC_DIR"
rm sha256.txt
rm build.tar.gz

echo "Successfully download dashboard assets to $STATIC_DIR"