#!/usr/bin/env bash
# Builds modding/src/mdlp/ (the first-party Mod Definition Language
# Processor, see ../README.md) and runs it against modding/mods/ to produce
# modding/dist/mods/, entirely offline - mdlp's own Go module dependencies
# were already fetched into the image at image-build time (see Dockerfile).
#
# Baked into the image at /usr/local/bin/process-mods.sh (see Dockerfile's
# CMD) - run via ../mdlp-run-image.sh, which bind-mounts the whole
# repository (not just modding/) at /workspace, since mdlp also needs the
# game's own data directory outside modding/.
#
# Set MODS="name1 name2" (before calling ../mdlp-run-image.sh) to build only
# those mods; unset or empty builds every subdirectory under mods/.
set -euo pipefail

MODDING_ROOT="$(pwd)"
REPO_ROOT="$(cd .. && pwd)"

DATA_DIR="${MDLP_DATA_DIR:-$REPO_ROOT/res/assets/ss_ee/data}"
OUT_DIR="$MODDING_ROOT/dist/mods"

[ -d "$DATA_DIR" ] \
    || { echo "Game data not found at $DATA_DIR - see the root README.md section 3." >&2; exit 1; }

echo "== Staging a patched copy of hacked/ for mdlp to build against =="
# mdlp's own go.mod points a `replace` at the sibling ../hacked - stage a
# patched copy here (never build src/hacked/ in place) so mdlp picks up the
# same fixes hacked's own binary does (see src/hacked-patches/).
SCRATCH_DIR="$MODDING_ROOT/build/mdlp-src"
rm -rf "$SCRATCH_DIR"
mkdir -p "$SCRATCH_DIR"
bash "$MODDING_ROOT/mdlp-image/stage-hacked.sh" "$MODDING_ROOT" "$SCRATCH_DIR/hacked"
cp -a "$MODDING_ROOT/src/mdlp" "$SCRATCH_DIR/mdlp"

echo "== Building mdlp =="
BIN_DIR="$(mktemp -d)"
trap 'rm -rf "$BIN_DIR"' EXIT
(cd "$SCRATCH_DIR/mdlp" && go build -trimpath -o "$BIN_DIR/mdlp" .)

MDLP_ARGS=(-data "$DATA_DIR" -mods "$MODDING_ROOT/mods" -out "$OUT_DIR")
if [ -n "${MODS:-}" ]; then
    MDLP_ARGS+=(-only "$MODS")
fi

echo "== Processing mods =="
"$BIN_DIR/mdlp" "${MDLP_ARGS[@]}"

echo "== Done =="
echo "Output: $OUT_DIR"