#!/bin/bash

set -euo pipefail

script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
scst_dir="$(dirname -- "$script_dir")"
test_dir="$(mktemp -d)"

trap 'rm -rf -- "$test_dir"' EXIT

mkdir -p "$test_dir/orig"

cat > "$test_dir/orig/qla.h" <<'EOF'
/* SPDX-License-Identifier: GPL-2.0 */
#if !defined(_TRACE_QLA_H_) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_QLA_H_

#include <linux/tracepoint.h>

#undef TRACE_SYSTEM
#define TRACE_SYSTEM qla

#define QLA_MSG_MAX 256

#pragma GCC diagnostic push
#ifndef __clang__
#pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
#endif

DECLARE_EVENT_CLASS(qla_log_event,
	TP_PROTO(const char *buf,
		struct va_format *vaf),

	TP_ARGS(buf, vaf),

	TP_STRUCT__entry(
		__string(buf, buf)
		__vstring(msg, vaf->fmt, vaf->va)
	),
	TP_fast_assign(
		__assign_str(buf);
		__assign_vstr(msg, vaf->fmt, vaf->va);
	),

	TP_printk("%s %s", __get_str(buf), __get_str(msg))
);

#pragma GCC diagnostic pop

DEFINE_EVENT(qla_log_event, ql_dbg_log,
	TP_PROTO(const char *buf, struct va_format *vaf),
	TP_ARGS(buf, vaf)
);

#endif /* _TRACE_QLA_H */

#define TRACE_INCLUDE_FILE qla

#include <trace/define_trace.h>
EOF

if diff -up "$test_dir/orig/qla.h" \
  "$scst_dir/qla2x00t-32gbit/include/trace/events/qla.h" \
  > "$test_dir/qla.raw.patch"; then
  echo "Error: qla.h test inputs do not differ." >&2
  exit 1
else
  diff_status=$?
  if [ "$diff_status" -gt 1 ]; then
    exit "$diff_status"
  fi
fi

for kernel_version in 7.1 7.2; do
  mkdir -p "$test_dir/linux-$kernel_version/include/trace/events"
  cp "$test_dir/orig/qla.h" \
    "$test_dir/linux-$kernel_version/include/trace/events/qla.h"

  sed -e "s:^--- [^ ]*:--- linux-$kernel_version/include/trace/events/qla.h:" \
    -e "s:^+++ [^ ]*:+++ linux-$kernel_version/include/trace/events/qla.h:" \
    < "$test_dir/qla.raw.patch" > "$test_dir/qla-$kernel_version.patch"

  cat >> "$test_dir/qla-$kernel_version.patch" <<EOF
--- linux-$kernel_version/drivers/scst/next.c 2026-08-26 00:00:00.000000000 +0300
+++ linux-$kernel_version/drivers/scst/next.c 2026-08-26 00:00:00.000000000 +0300
@@ -1,1 +1,1 @@
-old
+new
EOF

  mkdir -p "$test_dir/linux-$kernel_version/drivers/scst"
  echo old > "$test_dir/linux-$kernel_version/drivers/scst/next.c"

  "$script_dir/specialize-patch" -v delete_disabled_code=1 \
    -v kernel_version="$kernel_version" -v SCST_IO_CONTEXT=0 \
    < "$test_dir/qla-$kernel_version.patch" \
    > "$test_dir/qla-$kernel_version.specialized.patch"

  grep -qF '@@ -9,8 +9,8 @@' \
    "$test_dir/qla-$kernel_version.specialized.patch"
  grep -qF '@@ -32,13 +32,15 @@' \
    "$test_dir/qla-$kernel_version.specialized.patch"

  patch --dry-run -f -s -p0 -d "$test_dir" \
    < "$test_dir/qla-$kernel_version.specialized.patch"

  "$script_dir/specialize-patch" -v blank_deleted_code=1 \
    -v kernel_version="$kernel_version" -v SCST_IO_CONTEXT=0 \
    < "$test_dir/qla-$kernel_version.patch" \
    > "$test_dir/qla-$kernel_version.specialized-n.patch"

  patch --dry-run -f -s -p0 -d "$test_dir" \
    < "$test_dir/qla-$kernel_version.specialized-n.patch"
done

echo "specialize-patch qla.h regression: PASS"