@echo off
setlocal ENABLEDELAYEDEXPANSION

REM Usage:
REM   start.bat [host] [port]
REM Examples:
REM   start.bat                -> try 0.0.0.0:4567, fallback to localhost and 5173
REM   start.bat local 8080     -> localhost:8080
REM   start.bat lan 4567       -> 0.0.0.0:4567

set HOST=%~1
if "%HOST%"=="" set HOST=0.0.0.0
if /I "%HOST%"=="lan" set HOST=0.0.0.0
if /I "%HOST%"=="local" set HOST=localhost

set PORT=%~2
if "%PORT%"=="" set PORT=4567
set FALLBACK_PORT=5173

echo [Start] VuePress dev on host %HOST% port %PORT%
call npx vuepress@2.0.0-rc.24 dev docs --host %HOST% --port %PORT%
if %ERRORLEVEL% EQU 0 goto success

REM Fallback 1: switch to localhost same port
if NOT "%HOST%"=="localhost" (
  echo [Fallback] switch to localhost on same port %PORT%...
  call npx vuepress@2.0.0-rc.24 dev docs --host localhost --port %PORT%
  if %ERRORLEVEL% EQU 0 goto success
)

REM Fallback 2: clean cache and use localhost on fallback port
if NOT "%PORT%"=="%FALLBACK_PORT%" (
  echo [Fallback] clean cache and start on localhost:%FALLBACK_PORT%...
  call npx vuepress@2.0.0-rc.24 dev docs --clean-cache --clean-temp --host localhost --port %FALLBACK_PORT%
  if %ERRORLEVEL% EQU 0 (
    set HOST=localhost
    set PORT=%FALLBACK_PORT%
    goto success
  )
)

REM Fallback 3: try another common port
set ALT_PORT=8080
if NOT "%PORT%"=="%ALT_PORT%" (
  echo [Fallback] try localhost:%ALT_PORT%...
  call npx vuepress@2.0.0-rc.24 dev docs --host localhost --port %ALT_PORT%
  if %ERRORLEVEL% EQU 0 (
    set HOST=localhost
    set PORT=%ALT_PORT%
    goto success
  )
)

echo [Error] Failed to start dev server. Please check firewall or port usage.
exit /b 1

:success
echo [Ready] Open http://localhost:%PORT%/ (or http://%HOST%:%PORT%/ if accessible)
exit /b 0