@echo off
setlocal enabledelayedexpansion

rem Sync standards snapshot to project root.
rem - Copies <snapshot>\.agents -> <project-root>\.agents\tsl
rem - Updates <project-root>\.gitattributes (managed block by default)
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"
echo %AGENTS_NS%| findstr /r "[\\/]" >nul && (
  echo ERROR: invalid AGENTS_NS=%AGENTS_NS%
  exit /b 1
)
echo %AGENTS_NS%| findstr /c:".." >nul && (
  echo ERROR: invalid AGENTS_NS=%AGENTS_NS%
  exit /b 1
)
set "AGENTS_ROOT=%ROOT%\.agents"
set "AGENTS_DST=%AGENTS_ROOT%\%AGENTS_NS%"
set "GITATTR_DST=%ROOT%\.gitattributes"
set "SYNC_GITATTR_MODE=%SYNC_GITATTR_MODE%"
if "%SYNC_GITATTR_MODE%"=="" set "SYNC_GITATTR_MODE=block"

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 相关规则集（由 `sync_standards.*` 同步；适用于 `.tsl`/`.tsf`）
  >> "%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。
  >> "%AGENTS_ROOT%\index.md" echo.
  >> "%AGENTS_ROOT%\index.md" echo 入口建议从：
  >> "%AGENTS_ROOT%\index.md" echo.
  >> "%AGENTS_ROOT%\index.md" echo - `.agents/tsl/index.md`（TSL 规则集入口）
  >> "%AGENTS_ROOT%\index.md" echo - `docs/standards/tsl/docs/tsl/`（TSL 人类开发规范快照，推荐 subtree/vendoring 到该路径）
  echo Created .agents\index.md
)

:SyncGitAttr
if exist "%GITATTR_SRC%" (
  if /I "%SYNC_GITATTR_MODE%"=="skip" (
    echo Skip: .gitattributes sync ^(SYNC_GITATTR_MODE=skip^).
    goto AfterGitAttr
  )

  if /I "%SYNC_GITATTR_MODE%"=="overwrite" (
    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 ^(overwrite^).
    goto AfterGitAttr
  )

  if /I not "%SYNC_GITATTR_MODE%"=="block" (
    echo ERROR: invalid SYNC_GITATTR_MODE=%SYNC_GITATTR_MODE% ^(use block^|overwrite^|skip^) 
    exit /b 1
  )

  rem block mode: maintain a managed block inside the destination file
  set "BEGIN=# BEGIN tsl-playbook .gitattributes"
  set "END=# END tsl-playbook .gitattributes"
  set "TMP_FILE=%TEMP%\\gitattributes.%RANDOM%.tmp"

  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!
    set "DST_IN=%ROOT%\\!BAK_NAME!"
  ) else (
    set "DST_IN="
  )

  set "IN_BLOCK=0"
  set "DONE=0"

  if not "%DST_IN%"=="" (
    > "!TMP_FILE!" (
      for /f "usebackq delims=" %%L in ("!DST_IN!") do (
        set "LINE=%%L"
        if "!LINE!"=="%BEGIN%" (
          if "!DONE!"=="0" (
            echo %BEGIN%
            type "%GITATTR_SRC%"
            echo %END%
            set "DONE=1"
          )
          set "IN_BLOCK=1"
        ) else if "!LINE!"=="%END%" (
          set "IN_BLOCK=0"
        ) else (
          if "!IN_BLOCK!"=="0" echo(!LINE!
        )
      )
      if "!DONE!"=="0" (
        echo.
        echo %BEGIN%
        type "%GITATTR_SRC%"
        echo %END%
      )
    )
  ) else (
    > "!TMP_FILE!" (
      echo %BEGIN%
      type "%GITATTR_SRC%"
      echo %END%
    )
  )

  copy /y "!TMP_FILE!" "%GITATTR_DST%" >nul
  del /q "!TMP_FILE!" >nul 2>nul
  echo Updated .gitattributes from standards ^(managed block^).
)

:AfterGitAttr
echo Done.
endlocal