#!/usr/bin/env bash

set -euo pipefail

if [[ $# -lt 1 || $# -gt 3 ]]; then
  echo "用法: $0 <input.sy> [output_dir] [--run]" >&2
  exit 1
fi

input=$1
out_dir="test/test_result/asm"
run_exec=false
input_dir=$(dirname "$input")

shift
while [[ $# -gt 0 ]]; do
  case "$1" in
    --run)
      run_exec=true
      ;;
    *)
      out_dir="$1"
      ;;
  esac
  shift
done

if [[ ! -f "$input" ]]; then
  echo "输入文件不存在: $input" >&2
  exit 1
fi

# 查找编译器路径 (使用绝对路径)
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
compiler="$PROJECT_ROOT/build/bin/compiler"

if [[ ! -x "$compiler" ]]; then
  echo "未找到编译器: $compiler ，请先构建。" >&2
  exit 1
fi

if ! command -v aarch64-linux-gnu-gcc >/dev/null 2>&1; then
  echo "未找到 aarch64-linux-gnu-gcc，无法汇编/链接。" >&2
  exit 1
fi

mkdir -p "$out_dir"
base=$(basename "$input")
stem=${base%.sy}
asm_file="$out_dir/$stem.s"
exe="$out_dir/$stem"
stdin_file="$input_dir/$stem.in"
expected_file="$input_dir/$stem.out"

# 查找运行库路径
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SYLIB="$SCRIPT_DIR/../sylib/sylib.c"

"$compiler" --emit-asm "$input" > "$asm_file"
echo "汇编已生成: $asm_file"

if [[ -f "$SYLIB" ]]; then
  aarch64-linux-gnu-gcc "$asm_file" "$SYLIB" -o "$exe"
else
  aarch64-linux-gnu-gcc "$asm_file" -o "$exe"
fi
echo "可执行文件已生成: $exe"

if [[ "$run_exec" == true ]]; then
  if ! command -v qemu-aarch64 >/dev/null 2>&1; then
    echo "未找到 qemu-aarch64，无法运行生成的可执行文件。" >&2
    exit 1
  fi

  stdout_file="$out_dir/$stem.stdout"
  actual_file="$out_dir/$stem.actual.out"
  run_timeout="${SY_QEMU_TIMEOUT:-90}"
  echo "运行 $exe ..."
  set +e
  ulimit -s unlimited 2>/dev/null || true
  export QEMU_STACK_SIZE=67108864
  if command -v timeout >/dev/null 2>&1; then
    if [[ -f "$stdin_file" ]]; then
      timeout "${run_timeout}s" qemu-aarch64 -L /usr/aarch64-linux-gnu "$exe" < "$stdin_file" > "$stdout_file"
    else
      timeout "${run_timeout}s" qemu-aarch64 -L /usr/aarch64-linux-gnu "$exe" > "$stdout_file"
    fi
  else
    if [[ -f "$stdin_file" ]]; then
      qemu-aarch64 -L /usr/aarch64-linux-gnu "$exe" < "$stdin_file" > "$stdout_file"
    else
      qemu-aarch64 -L /usr/aarch64-linux-gnu "$exe" > "$stdout_file"
    fi
  fi
  status=$?
  set -e
  if [[ $status -eq 124 ]]; then
    echo "运行超时: ${run_timeout}s" >&2
    exit 124
  fi
  cat "$stdout_file"
  echo "退出码: $status"
  {
    cat "$stdout_file"
    if [[ -s "$stdout_file" ]] && (( $(tail -c 1 "$stdout_file" | wc -l) == 0 )); then
      printf '\n'
    fi
    printf '%s\n' "$status"
  } > "$actual_file"

  if [[ -f "$expected_file" ]]; then
    if diff -u -b -w "$expected_file" "$actual_file"; then
      echo "输出匹配: $expected_file"
    else
      echo "输出不匹配: $expected_file" >&2
      echo "实际输出已保存: $actual_file" >&2
      exit 1
    fi
  else
    echo "未找到预期输出文件，跳过比对: $expected_file"
  fi
fi