#!/usr/bin/env bash
#
# Copyright 2022 Andreas Kurth
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

set -euo pipefail

readonly THIS_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
readonly REPO_DIR="$(dirname "$THIS_DIR")"

readonly os_and_ver="$1"
readonly os="$(echo "$os_and_ver" | cut -d ':' -f 1)"
readonly os_and_ver_compact="$(echo "$os_and_ver" | tr -d ':')"

mkdir_and_cd() {
    mkdir -p "$1"
    cd "$1"
}
mkdir_and_cd "$REPO_DIR/build/$os_and_ver_compact"

# Generate Dockerfile
readonly dockerfile='Dockerfile'

echo "FROM $os_and_ver" > $dockerfile
echo "" >> $dockerfile

if test "$os" = "centos"; then
    echo 'RUN yum group install "Development Tools" -y && yum clean all' >> $dockerfile
fi
echo "" >> $dockerfile

echo 'ENV RUSTUP_HOME=/usr/local/rustup' >> $dockerfile
echo 'ENV CARGO_HOME=/usr/local/cargo' >> $dockerfile
echo 'ENV PATH=$CARGO_HOME/bin:$PATH' >> $dockerfile
echo "" >> $dockerfile

echo 'RUN mkdir -p "$CARGO_HOME" && mkdir -p "$RUSTUP_HOME" && \' >> $dockerfile
echo '  curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain stable && \' >> $dockerfile
echo '  chmod -R a=rwX $CARGO_HOME' >> $dockerfile
echo "" >> $dockerfile

cp "$REPO_DIR/Cargo.toml" .
echo 'COPY Cargo.toml /source/' >> $dockerfile
echo 'RUN cd /source && mkdir -p src && echo "fn main() {}" > src/main.rs && cargo fetch' >> $dockerfile

echo 'WORKDIR /source' >> $dockerfile

# Build Docker image
docker build . -t "$os_and_ver"

# Run cross-platform build in Docker image
docker run \
    -t --rm \
    -v "$REPO_DIR:/source" \
    -v "$REPO_DIR/target/$os_and_ver_compact:/source/target" \
    "$os_and_ver" \
    cargo build --release