@echo off
setlocal enabledelayedexpansion

rem Sync standards snapshot to project root.
rem - Copies <snapshot>\.agents -> <project-root>\.agents\tsl
rem - Copies <snapshot>\.gitattributes -> <project-root>\.gitattributes
rem Existing targets are backed up before overwrite.

set "SCRIPT_DIR=%~dp0"
for /f "delims=" %%R in ('git -C "%SCRIPT_DIR%" rev-parse --show-toplevel 2^>nul') do set "ROOT=%%R"
if "%ROOT%"=="" set "ROOT=%cd%"
for %%I in ("%ROOT%") do set "ROOT=%%~fI"

for %%I in ("%SCRIPT_DIR%..") do set "SRC=%%~fI"
set "AGENTS_SRC=%SRC%\.agents"
set "GITATTR_SRC=%SRC%\.gitattributes"
set "AGENTS_NS=%AGENTS_NS%"
if "%AGENTS_NS%"=="" set "AGENTS_NS=tsl"
set "AGENTS_ROOT=%ROOT%\.agents"
set "AGENTS_DST=%AGENTS_ROOT%\%AGENTS_NS%"
set "GITATTR_DST=%ROOT%\.gitattributes"

if not exist "%AGENTS_SRC%" (
  echo ERROR: Standards snapshot not found at "%AGENTS_SRC%".
  echo Run: git subtree add --prefix ^<your-prefix^> ^<standards-url^> ^<branch^> --squash
  exit /b 1
)

if /I "%SRC%"=="%ROOT%" (
  echo Skip: snapshot root equals project root.
  goto AfterGitAttr
)

if not exist "%AGENTS_ROOT%" mkdir "%AGENTS_ROOT%"

if exist "%AGENTS_DST%" (
  set "RAND=%RANDOM%"
  pushd "%AGENTS_ROOT%"
  ren "%AGENTS_NS%" "%AGENTS_NS%.bak.!RAND!"
  popd
  echo Backed up existing %AGENTS_NS% agents -> %AGENTS_NS%.bak.!RAND!
)

xcopy "%AGENTS_SRC%\\*" "%AGENTS_DST%\\" /e /i /y >nul
if errorlevel 1 (
  echo ERROR: failed to copy .agents
  exit /b 1
)

echo Synced .agents\%AGENTS_NS% from standards.

if not exist "%AGENTS_ROOT%\index.md" (
  > "%AGENTS_ROOT%\index.md" echo # .agents（多语言）
  >> "%AGENTS_ROOT%\index.md" echo.
  >> "%AGENTS_ROOT%\index.md" echo 本目录用于存放仓库级/语言级的代理规则集。
  >> "%AGENTS_ROOT%\index.md" echo.
  >> "%AGENTS_ROOT%\index.md" echo 建议约定：
  >> "%AGENTS_ROOT%\index.md" echo.
  >> "%AGENTS_ROOT%\index.md" echo - `.agents/tsl/`：TSL 相关标准（由 `sync_standards.*` 同步）
  >> "%AGENTS_ROOT%\index.md" echo - `.agents/cpp/`、`.agents/python/` 等：其他语言的规则集（按需增加）
  >> "%AGENTS_ROOT%\index.md" echo.
  >> "%AGENTS_ROOT%\index.md" echo 规则发生冲突时，建议以“更靠近代码的目录规则更具体”为准。
  echo Created .agents\index.md
)

:SyncGitAttr
if exist "%GITATTR_SRC%" (
  for %%I in ("%GITATTR_SRC%") do set "GITATTR_SRC_F=%%~fI"
  for %%I in ("%GITATTR_DST%") do set "GITATTR_DST_F=%%~fI"
  if /I "!GITATTR_SRC_F!"=="!GITATTR_DST_F!" (
    echo Skip: .gitattributes source equals destination.
    goto AfterGitAttr
  )

  if exist "%GITATTR_DST%" (
    set "RAND=%RANDOM%"
    set "BAK_NAME=.gitattributes.bak.!RAND!"
    ren "%GITATTR_DST%" "!BAK_NAME!"
    echo Backed up existing .gitattributes -> !BAK_NAME!
  )
  copy /y "%GITATTR_SRC%" "%GITATTR_DST%" >nul
  echo Synced .gitattributes from standards.
)

:AfterGitAttr
echo Done.
endlocal