#!/usr/bin/env bash
# Generate shim/src/stubs.c from analysis/all_exports.txt (the FULL 438-export set).
# Each ovrp_ function gets a stub returning a sensible ovrpResult, classified by
# name per SHIM-SCOPE.md buckets. Functions prototyped in the header (real sigs)
# are SKIPPED here and live in core.c instead.
set -euo pipefail
ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
# Use the ORIGINAL lib's FULL export set (438) so the shim is a complete drop-in:
# any dlsym of any ovrp_ resolves, even the 199 RE4 doesn't reference.
SURF="$ROOT/analysis/all_exports.txt"
OUT="$ROOT/shim/src/stubs.c"
mkdir -p "$ROOT/shim/src"

# functions with real prototypes in ovrplugin_shim.h -> handled in core.c
HEADER_FNS=" ovrp_GetNodePoseState3 ovrp_GetNodePoseStateRaw ovrp_GetControllerState4 \
ovrp_PreInitialize3 ovrp_Initialize5 ovrp_Shutdown2 ovrp_Update3 ovrp_WaitToBeginFrame \
ovrp_BeginFrame4 ovrp_EndFrame4 ovrp_GetPredictedDisplayTime ovrp_GetSystemHeadsetType2 \
ovrp_GetTrackingOriginType2 ovrp_SetTrackingOriginType2 ovrp_RecenterTrackingOrigin2 \
ovrp_SetupLayer ovrp_GetLayerTextureStageCount ovrp_GetLayerTexture2 \
ovrp_GetInstanceExtensionsVk ovrp_GetDeviceExtensionsVk \
ovrp_GetInitialized ovrp_GetSystemDisplayFrequency2 ovrp_GetTimeInSeconds \
ovrp_GetAppHasVrFocus2 ovrp_GetAppShouldQuit2 ovrp_GetUserPresent2 \
ovrp_GetAppShouldRecenter2 ovrp_GetAppShouldRecreateDistortionWindow2 \
ovrp_GetSystemMultiViewSupported2 ovrp_GetAppHasInputFocus ovrp_SetupDistortionWindow3 \
ovrp_CalculateEyeLayerDesc2 ovrp_CalculateEyeViewportRect ovrp_GetMixedRealityInitialized ovrp_CalculateLayerDesc ovrp_GetNodePresent2 ovrp_GetNodeOrientationValid ovrp_GetNodePositionValid ovrp_GetNodeOrientationTracked2 ovrp_GetNodePositionTracked2 ovrp_SetControllerVibration2 \
ovrp_GetTiledMultiResSupported ovrp_GetTiledMultiResLevel ovrp_SetTiledMultiResLevel \
ovrp_GetTiledMultiResDynamic ovrp_SetTiledMultiResDynamic ovrp_GetGPUFrameTime \
ovrp_DestroyLayer ovrp_GetNodeFrustum2 ovrp_SetSystemCpuLevel2 ovrp_SetSystemGpuLevel2 \
ovrp_IsPerfMetricsSupported ovrp_GetPerfMetricsFloat ovrp_GetPerfMetricsInt \
ovrp_GetAdaptiveGpuPerformanceScale2 \
ovrp_DestroyDistortionWindow2 ovrp_SetupDisplayObjects2 ovrp_SetReorientHMDOnControllerRecenter \
ovrp_SetClientColorDesc ovrp_SetAppEngineInfo2 ovrp_SetAppCPUPriority2 ovrp_InitializeMixedReality \
ovrp_GetViewportStencil ovrp_GetSystemRecommendedMSAALevel2 ovrp_GetLocalTrackingSpaceRecenterCount \
ovrp_GetLayerTextureFoveation ovrp_GetControllerHapticsDesc2 "
# NB: the trailing 12 are game-called () stubs now owned by passthru.c — they keep their
# original return constant when passthru is off, and tail-call the real lib when it's on.

{
echo '/* AUTO-GENERATED by gen_stubs.sh from analysis/all_exports.txt. Do not edit by hand. */'
echo '#include "ovrplugin_shim.h"'
echo '#include "log.h"'
echo
echo '/* Stub policy:'
echo ' *   -1004 Unsupported       : features we will not implement (MRC/camera/perf/boundary/hands)'
echo ' *    0    Success (no-op)    : config setters we can safely accept-and-ignore for now'
echo ' *   -1005 NotYetImplemented  : real work still owed (getters/etc. the game needs)'
echo ' * Empty () = unspecified args: stub ignores args, returns constant in result reg. */'
echo
n_unsup=0; n_noop=0; n_todo=0; n_skip=0
while read -r fn; do
  [ -z "$fn" ] && continue
  case " $HEADER_FNS " in *" $fn "*) n_skip=$((n_skip+1)); continue;; esac
  if echo "$fn" | grep -qE 'Media_|CameraDevice|ExternalCamera|HandState|Skeleton|GetMesh|HandTracking|HandNode|PerfMetric|GPUUtil|GPUFrameTime|ASW|TiledMultiRes|Boundary'; then
    ret="ovrpFailure_Unsupported"; n_unsup=$((n_unsup+1))
  elif echo "$fn" | grep -qE '^ovrp_Set[A-Z]|^ovrp_Reset|^ovrp_Recenter|^ovrp_SendEvent|^ovrp_Destroy|^ovrp_Override'; then
    ret="ovrpSuccess"; n_noop=$((n_noop+1))
  else
    ret="ovrpFailure_NotYetImplemented"; n_todo=$((n_todo+1))
  fi
  printf 'OVRP_EXPORT ovrpResult %s() { static int o; if(!o){o=1;XRRLOG("stub %s -> %s");} return %s; }\n' "$fn" "$fn" "$ret" "$ret"
done < "$SURF"
echo
echo "/* generated: unsup=$n_unsup noop=$n_noop todo=$n_todo skipped(core)=$n_skip */"
} > "$OUT"

echo "wrote $OUT"
grep -c '^OVRP_EXPORT' "$OUT" | xargs echo "stub functions:"
tail -1 "$OUT"