#!/usr/bin/env bash
# Builds dump2png (see dump2png/main.go) inside modding/mdlp-image's Go
# toolchain - dump2png has no cgo dependencies of its own, so it reuses that
# image rather than needing one of its own, same reasoning as
# modding/gen_animgallery.sh.
#
# Usage: ./build-dump2png.sh <output-path>
#   <output-path> is relative to the repository root (typically
#   dist/dump2png - see the root Makefile's dist_debug target and
#   README.md's "Debugging" section) - it's written on both sides of the
#   bind mount below, so an absolute or ../-escaping path won't resolve to
#   the same file on the host afterward.
set -euo pipefail

cd "$(dirname "${BASH_SOURCE[0]}")"
REPO_ROOT="$(cd .. && pwd)"

[ "$#" -eq 1 ] || { echo "usage: $0 <output-path-relative-to-repo-root>" >&2; exit 1; }
OUT_PATH="$1"
case "$OUT_PATH" in
    /*) echo "PREFLIGHT FAIL: <output-path> must be relative to the repo root, not absolute: $OUT_PATH" >&2; exit 1 ;;
esac

fail() { echo "PREFLIGHT FAIL: $*" >&2; exit 1; }

command -v docker >/dev/null 2>&1 \
    || fail "docker not found in PATH"

IMAGE="${MDLP_REGISTRY_IMAGE:-questshock/mdlp}"
if [ -f "$REPO_ROOT/registry.env" ]; then
    # shellcheck disable=SC1091
    source "$REPO_ROOT/registry.env"
    IMAGE="${MDLP_REGISTRY_IMAGE:-$IMAGE}"
fi
IMAGE_TAG="$(<"$REPO_ROOT/modding/mdlp-image/VERSION")"
[ -n "$IMAGE_TAG" ] || fail "modding/mdlp-image/VERSION is empty"
IMAGE="$IMAGE:$IMAGE_TAG"

docker image inspect "$IMAGE" >/dev/null 2>&1 \
    || fail "$IMAGE not found locally - run modding/mdlp-image.sh first"

docker run --rm \
    -v "$REPO_ROOT:/workspace" \
    -w /workspace \
    -e HOST_UID="$(id -u)" \
    -e HOST_GID="$(id -g)" \
    "$IMAGE" \
    bash -c '
        set -euo pipefail
        # dump2png builds against ../../modding/src/hacked via its own
        # go.mod replace (matching that relative depth exactly, since
        # engine-debug-tools/ sits next to modding/ at the repo root) -
        # stage a patched copy (see modding/src/hacked-patches/) at that
        # same relative position rather than building against the
        # unpatched vendored source.
        SCRATCH_DIR="engine-debug-tools/build/dump2png-src"
        rm -rf "$SCRATCH_DIR"
        mkdir -p "$SCRATCH_DIR/engine-debug-tools"
        bash modding/mdlp-image/stage-hacked.sh modding "$SCRATCH_DIR/modding/src/hacked"
        cp -a engine-debug-tools/dump2png "$SCRATCH_DIR/engine-debug-tools/dump2png"
        mkdir -p "$(dirname "/workspace/$1")"
        (cd "$SCRATCH_DIR/engine-debug-tools/dump2png" && go build -o "/workspace/$1" .)
    ' _ "$OUT_PATH"

echo "Built: $OUT_PATH"