@echo off
setlocal enabledelayedexpansion

rem Sync standards snapshot to project root.
rem - Copies <snapshot>\rulesets\<AGENTS_NS> -> <project-root>\.agents\<AGENTS_NS>
rem - Updates <project-root>\.gitattributes (append missing rules by default)
rem Existing targets are backed up before overwrite.
rem
rem Multi rulesets:
rem   sync_standards.bat tsl cpp
rem Notes:
rem - When syncing multiple rulesets, .gitattributes is synced only once (first ruleset).

set "SCRIPT_DIR=%~dp0"
set "ROOT=%SYNC_ROOT%"
if "%ROOT%"=="" 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_ROOT=%SRC%\rulesets"
if not exist "%AGENTS_SRC_ROOT%" (
  if exist "%SRC%\.agents" (
    set "AGENTS_SRC_ROOT=%SRC%\.agents"
  )
)
set "GITATTR_SRC=%SRC%\.gitattributes"

if not exist "%AGENTS_SRC_ROOT%" (
  echo ERROR: Standards snapshot not found at %AGENTS_SRC_ROOT% >&2
  echo Run: git subtree add --prefix docs/standards/playbook ^<url^> ^<branch^> --squash >&2
  exit /b 1
)
set "AGENTS_NS=%AGENTS_NS%"
set "GITATTR_DST=%ROOT%\.gitattributes"
set "SYNC_GITATTR_MODE=%SYNC_GITATTR_MODE%"
if "%SYNC_GITATTR_MODE%"=="" set "SYNC_GITATTR_MODE=append"

rem Multi rulesets: only on outer invocation.
if "%SYNC_STANDARDS_INNER%"=="" (
  set "LANG_LIST="
  if not "%~1"=="" set "LANG_LIST=%*"
  if "%LANG_LIST%"=="" (
    if "%AGENTS_NS%"=="" (
      if exist "%ROOT%\.agents" (
        for /d %%D in ("%ROOT%\.agents\*") do (
          set "CAND=%%~nxD"
          if exist "%AGENTS_SRC_ROOT%\!CAND!\" (
            if defined LANG_LIST (set "LANG_LIST=!LANG_LIST! !CAND!") else set "LANG_LIST=!CAND!"
          )
        )
      )
    )
  )
  if not "%LANG_LIST%"=="" (
    set "FIRST=1"
    set "SYNC_FIRST=%SYNC_GITATTR_MODE%"
    for %%L in (!LANG_LIST!) do (
      if "!FIRST!"=="1" (
        set "FIRST=0"
        set "SYNC_STANDARDS_INNER=1"
        set "AGENTS_NS=%%~L"
        set "SYNC_GITATTR_MODE=!SYNC_FIRST!"
        call "%~f0"
      ) else (
        set "SYNC_STANDARDS_INNER=1"
        set "AGENTS_NS=%%~L"
        set "SYNC_GITATTR_MODE=skip"
        call "%~f0"
      )
    )
    exit /b 0
  )
)

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 "AGENTS_SRC=%AGENTS_SRC_ROOT%\%AGENTS_NS%"
if not exist "%AGENTS_SRC%" (
  rem Backward-compatible fallback: older snapshots used ^<snapshot^>\.agents\* directly.
  if exist "%AGENTS_SRC_ROOT%\index.md" if exist "%AGENTS_SRC_ROOT%\auth.md" (
    set "AGENTS_SRC=%AGENTS_SRC_ROOT%"
  ) else (
    echo ERROR: Standards snapshot not found at "%AGENTS_SRC%".
    echo Hint: set AGENTS_NS to one of the subdirs under "%AGENTS_SRC_ROOT%" ^(e.g. tsl/cpp^).
    exit /b 1
  )
)
if not exist "%AGENTS_SRC%" (
  echo ERROR: Standards snapshot not found at "%AGENTS_SRC%".
  echo Run: git subtree add --prefix docs/standards/playbook ^<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/`：C++ 相关规则集（由 `sync_standards.*` 同步；适用于 C++23/Modules）
  >> "%AGENTS_ROOT%\index.md" echo - `.agents/python/`：Python 相关规则集（由 `sync_standards.*` 同步）
  >> "%AGENTS_ROOT%\index.md" echo - `.agents/markdown/`：Markdown 相关规则集（仅代码格式化）
  >> "%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 - `.agents/cpp/index.md`（C++ 规则集入口）
  >> "%AGENTS_ROOT%\index.md" echo - `.agents/markdown/index.md`（Markdown 规则集入口）
  >> "%AGENTS_ROOT%\index.md" echo - `docs/standards/playbook/docs/`（人类开发规范快照：`tsl/`、`cpp/`、`python/`、`common/`）
  echo Created .agents\index.md
)

if not exist "%ROOT%\AGENTS.md" (
  > "%ROOT%\AGENTS.md" echo # Agent Instructions
  >> "%ROOT%\AGENTS.md" echo.
  >> "%ROOT%\AGENTS.md" echo 请以 `.agents/` 下的规则为准：
  >> "%ROOT%\AGENTS.md" echo.
  >> "%ROOT%\AGENTS.md" echo - 入口：`.agents/index.md`
  >> "%ROOT%\AGENTS.md" echo - 语言规则：`.agents/tsl/index.md`、`.agents/cpp/index.md`、`.agents/python/index.md`、`.agents/markdown/index.md`
  echo Created AGENTS.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 "%SYNC_GITATTR_MODE%"=="append" (
    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
    )

    set "TMP_DST=%TEMP%\\gitattributes.dst.%RANDOM%.tmp"
    set "TMP_MISS=%TEMP%\\gitattributes.missing.%RANDOM%.tmp"
    if exist "!TMP_DST!" del /q "!TMP_DST!" >nul 2>nul
    if exist "!TMP_MISS!" del /q "!TMP_MISS!" >nul 2>nul
    type nul > "!TMP_DST!"
    type nul > "!TMP_MISS!"

    if exist "%GITATTR_DST%" (
      for /f "usebackq delims=" %%L in ("%GITATTR_DST%") do (
        set "LINE=%%L"
        for /f "tokens=* delims= " %%A in ("!LINE!") do set "LINE=%%A"
        if not "!LINE!"=="" (
          if /I not "!LINE:~0,1!"=="#" (
            echo(!LINE!>>"!TMP_DST!"
          )
        )
      )
    )

    for /f "usebackq delims=" %%L in ("%GITATTR_SRC%") do (
      set "LINE=%%L"
      for /f "tokens=* delims= " %%A in ("!LINE!") do set "LINE=%%A"
      if not "!LINE!"=="" (
        if /I not "!LINE:~0,1!"=="#" (
          findstr /x /l /c:"!LINE!" "!TMP_DST!" >nul || (
            findstr /x /l /c:"!LINE!" "!TMP_MISS!" >nul || echo(!LINE!>>"!TMP_MISS!"
          )
        )
      )
    )

    set "MISS_SIZE=0"
    if exist "!TMP_MISS!" for %%S in ("!TMP_MISS!") do set "MISS_SIZE=%%~zS"
    if "!MISS_SIZE!"=="0" (
      del /q "!TMP_DST!" "!TMP_MISS!" >nul 2>nul
      echo No missing .gitattributes rules to append.
      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!
      set "DST_IN=%ROOT%\\!BAK_NAME!"
    ) else (
      set "DST_IN="
    )

    set "TMP_OUT=%TEMP%\\gitattributes.out.%RANDOM%.tmp"
    if exist "!TMP_OUT!" del /q "!TMP_OUT!" >nul 2>nul

    if not "!DST_IN!"=="" (
      type "!DST_IN!" > "!TMP_OUT!"
      for %%S in ("!DST_IN!") do set "DST_SIZE=%%~zS"
      if not "!DST_SIZE!"=="0" echo.>>"!TMP_OUT!"
    )

    set "SOURCE_NOTE=%GITATTR_SRC%"
    >>"!TMP_OUT!" echo # Added from playbook .gitattributes ^(source: !SOURCE_NOTE!^)
    type "!TMP_MISS!" >> "!TMP_OUT!"

    copy /y "!TMP_OUT!" "%GITATTR_DST%" >nul
    del /q "!TMP_DST!" "!TMP_MISS!" "!TMP_OUT!" >nul 2>nul
    echo Appended missing .gitattributes rules from standards.
    goto AfterGitAttr
  )

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

  rem block mode: maintain a managed block inside the destination file
  set "BEGIN=# BEGIN playbook .gitattributes"
  set "END=# END playbook .gitattributes"
  set "BEGIN_OLD=# BEGIN tsl-playbook .gitattributes"
  set "END_OLD=# 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!"=="%BEGIN_OLD%" (
          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 "!LINE!"=="%END_OLD%" (
          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