#!/usr/bin/env bash
# Surgical rebuild of xenia_canary inside the sylph box.
#
# The image has no cmake/ninja/clang of its own and the build/ cache cannot be
# re-configured (see project_sylph_canary_patch_toolchain memory), so a full
# `ninja` is impossible: several TUs need dev headers this image lacks. What DOES
# work is compiling only the objects that changed, refreshing their archive, and
# re-running the link command lifted out of the generated ninja file.
#
# Usage: rebuild.sh <ninja object path> [more objects...]
#   e.g. rebuild.sh src/xenia/kernel/CMakeFiles/xenia-kernel.dir/Release/xboxkrnl/xboxkrnl_video.cc.o
# Objects are paths relative to build/. The archive each belongs to is derived
# from the .dir name (xenia-kernel.dir -> obj/Linux/Release/libxenia-kernel.a).
set -eu

PROJ="${PROJECT_DIR:-/home/fabi/RE - Project Sylpheed}"
BUILD="$PROJ/xenia-canary-native/build"
PFX=/sylph-home/re/toolchain
export PATH="$PFX/usr/lib/llvm-18/bin:/sylph-home/.local/bin:$PATH"
export LD_LIBRARY_PATH="$PFX/usr/lib/x86_64-linux-gnu:$PFX/usr/lib/llvm-18/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"

[ $# -ge 1 ] || { echo "usage: rebuild.sh <object.o> [...]" >&2; exit 2; }
cd "$BUILD"

echo "[rebuild] compiling $# object(s)"
ninja -f build-Release.ninja "$@"

declare -A LIBS=()
for o in "$@"; do
  d="${o#*CMakeFiles/}"; d="${d%%.dir/*}"
  lib="obj/Linux/Release/lib$d.a"
  [ -f "$lib" ] || { echo "[rebuild] no archive $lib for $o" >&2; exit 3; }
  ar r "$lib" "$o"
  LIBS["$lib"]=1
done
for lib in "${!LIBS[@]}"; do ranlib "$lib"; echo "[rebuild] refreshed $lib"; done

# Lift the link command out of the generated ninja rather than hard-coding it, so
# it stays correct if the object or library list ever changes.
python3 - <<'PY' > /tmp/xenia_link.sh
import re, shlex
NJ = "CMakeFiles/impl-Release.ninja"
txt = open(NJ).read()
m = re.search(r"^build bin/Linux/Release/xenia_canary: (\S+) (.*?)(?=\n\S|\n\n)",
              txt, re.M | re.S)
assert m, "link build statement not found"
head = m.group(2)
# $in = the explicit inputs, up to the first | (implicit deps)
ins = head.split("\n")[0].split(" | ")[0].split(" || ")[0].strip()
body = m.group(0)
var = dict(re.findall(r"^  (\w+) = (.*)$", body, re.M))
cmd = (f'{shlex.quote("/sylph-home/re/toolchain/usr/lib/llvm-18/bin/clang++")} '
       f'{var["FLAGS"]} {var["LINK_FLAGS"]} {ins} -o {var["TARGET_FILE"]} '
       f'{var.get("LINK_PATH","")} {var["LINK_LIBRARIES"]}')
print(cmd)
PY

echo "[rebuild] linking bin/Linux/Release/xenia_canary"
# The image ships runtime sonames only (libgtk-3.so.0, not libgtk-3.so) and no
# libstdc++fs.a; linkshim/ supplies both as symlinks + an empty archive.
LIBRARY_PATH="$PFX/linkshim${LIBRARY_PATH:+:$LIBRARY_PATH}" bash /tmp/xenia_link.sh
ls -la bin/Linux/Release/xenia_canary
echo "[rebuild] done"