#!/bin/bash
set -euo pipefail

REPO_URL="git@git.ayau.me:mira/gentoo-pill.git"
WORK_DIR="$(pwd)"
REPO="${WORK_DIR}/repo"
CTX="${WORK_DIR}/ctx"

IMAGE="docker.io/gentoo/stage3:amd64-desktop-openrc"
PROFILE="default/linux/amd64/23.0/desktop"

if [[ ! -d "$REPO/.git" ]]; then
    git clone "$REPO_URL" "$REPO"
else
    git -C "$REPO" pull --rebase
fi

echo "Aggregating config..."
rm -rf "$CTX" && mkdir -p "$CTX"/var/lib/portage

# config types to merge
CONFIGS=(package.use package.accept_keywords package.license package.mask package.unmask package.env repos.conf)

for type in "${CONFIGS[@]}"; do
    dest="$CTX/etc/portage/$type"
    mkdir -p "$dest"

    inject() {
        local src=$1 prefix=$2
        [[ ! -e "$src" ]] && return

        if [[ -d "$src" ]]; then
            for f in "$src"/*; do
                [[ -f "$f" ]] && cp "$f" "$dest/${prefix}-$(basename "$f")"
            done
        else
            cp "$src" "$dest/${prefix}-$(basename "$src")"
        fi
    }

    inject "$REPO/common/$type" "00-common"

    for host_dir in "$REPO/hosts"/*; do
        [[ -d "$host_dir" ]] || continue
        hostname=$(basename "$host_dir")
        inject "$host_dir/$type" "50-${hostname}"
    done
done

# generate world union
cat "$REPO"/hosts/*/world 2>/dev/null | sort -u | sed '/^#/d;/^$/d' > "$CTX/var/lib/portage/world"
echo "Packages to build: $(wc -l < "$CTX/var/lib/portage/world")"

# make.conf
mkdir -p "$CTX/etc/portage"
cp "$REPO/binhost/make.conf" "$CTX/etc/portage/make.conf"
{
    # we don't want build to fail bcs of EULA check..
    echo 'ACCEPT_LICENSE="*"'
} >> "$CTX/etc/portage/make.conf"

echo "Starting Builder..."

VOLUMES=(
    -v portage_db:/var/db/repos/gentoo
    -v distfiles:/var/cache/distfiles
    -v binpkgs:/var/cache/binpkgs
    -v "$CTX/etc/portage/make.conf:/etc/portage/make.conf"
    -v "$CTX/var/lib/portage/world:/var/lib/portage/world"
)

# add config dirs to volumes
for type in "${CONFIGS[@]}"; do
    VOLUMES+=(-v "$CTX/etc/portage/$type:/etc/portage/$type")
done

# start cooking
podman run --rm -i \
    --name "gentoo_builder" \
    --cap-add=SYS_PTRACE \
    "${VOLUMES[@]}" \
    --tmpfs /var/tmp/portage:rw,size=48G,mode=1777 \
    "$IMAGE" /bin/bash <<EOF
set -e
source /etc/profile

echo "> Syncing tree..."
emerge-webrsync -q

echo "> Installing git"
emerge -1vn dev-vcs/git

echo "> Syncing overlays"
emaint sync -a

echo "> Setting Profile..."
eselect profile set "$PROFILE"

echo "> Building World..."
emerge --verbose --buildpkg --update --deep --newuse --changed-use --with-bdeps=y --keep-going @world

echo "> Cleaning up..."
emerge --depclean
emaint binhost --fix
EOF