@echo off
setlocal enabledelayedexpansion

REM === ChildHood Level Builder - Command Line Build ===
REM
REM Usage:
REM   build_level.bat                              (default config)
REM   build_level.bat --json output/v02.json       (specify JSON)
REM   build_level.bat --map LVL_SuburbanV02        (specify map name)
REM   build_level.bat --no-quit                    (keep editor open)
REM   build_level.bat --no-null-rhi                (show editor window)
REM   build_level.bat --dry-run                    (print command only)

set "SCRIPT_DIR=%~dp0"
set "PROJECT_DIR=%SCRIPT_DIR%..\.."
for %%i in ("%PROJECT_DIR%\.") do set "PROJECT_ROOT=%%~fi"
set "UPROJECT=%PROJECT_ROOT%\ChildHood.uproject"

REM ---- Defaults ----
set "JSON_REL=tools/level-builder/output/level_v01.json"
set "MAP_NAME=LVL_SuburbanV01"
set "MAP_PACKAGE=/Game/Maps"
set "NO_QUIT=0"
set "NO_NULL_RHI=0"
set "DRY_RUN=0"

REM ---- Parse Arguments ----
:parse_args
if "%~1"=="" goto done_args
if /i "%~1"=="--json" (
    set "JSON_REL=%~2"
    shift
    shift
    goto parse_args
)
if /i "%~1"=="--map" (
    set "MAP_NAME=%~2"
    shift
    shift
    goto parse_args
)
if /i "%~1"=="--package" (
    set "MAP_PACKAGE=%~2"
    shift
    shift
    goto parse_args
)
if /i "%~1"=="--no-quit" (
    set "NO_QUIT=1"
    shift
    goto parse_args
)
if /i "%~1"=="--no-null-rhi" (
    set "NO_NULL_RHI=1"
    shift
    goto parse_args
)
if /i "%~1"=="--dry-run" (
    set "DRY_RUN=1"
    shift
    goto parse_args
)
if /i "%~1"=="--help" goto show_help
if /i "%~1"=="-h" goto show_help
echo [WARN] Unknown argument: %~1
shift
goto parse_args
:done_args

REM ---- Find UE5 Editor ----
set "UE_EDITOR="
if defined UE5_ROOT (
    for %%b in (UnrealEditor.exe UE5Editor.exe) do (
        if exist "%UE5_ROOT%\Engine\Binaries\Win64\%%b" (
            set "UE_EDITOR=%UE5_ROOT%\Engine\Binaries\Win64\%%b"
        )
    )
)

if "%UE_EDITOR%"=="" (
    for %%p in (
        "C:\Program Files\Epic Games\UE_5.7"
        "C:\Program Files (x86)\Epic Games\UE_5.7"
        "D:\Program Files\Epic Games\UE_5.7"
        "E:\Program Files\Epic Games\UE_5.7"
        "C:\Program Files\Epic Games\UE_5.6"
        "C:\Program Files (x86)\Epic Games\UE_5.6"
        "D:\Program Files\Epic Games\UE_5.6"
        "E:\Program Files\Epic Games\UE_5.6"
    ) do (
        if not defined UE_EDITOR (
            for %%b in (UnrealEditor.exe UE5Editor.exe) do (
                if exist "%%~p\Engine\Binaries\Win64\%%b" (
                    set "UE_EDITOR=%%~p\Engine\Binaries\Win64\%%b"
                )
            )
        )
    )
)

if "%UE_EDITOR%"=="" (
    echo.
    echo [ERROR] UE5 Editor not found!
    echo   Set UE5_ROOT to your UE5 install directory, e.g.:
    echo   set UE5_ROOT=C:\Program Files\Epic Games\UE_5.7
    echo.
    exit /b 1
)

REM ---- Path conversion (UE5 uses forward slashes) ----
set "SCRIPT_PATH=%SCRIPT_DIR%build_cmdline.py"
set "SCRIPT_PATH=!SCRIPT_PATH:\=/!"
set "UPROJECT_FWD=!UPROJECT:\=/!"

REM ---- Build command line ----
set "CMD_ARGS=-unattended -NoSound"
if "!NO_NULL_RHI!"=="0" set "CMD_ARGS=!CMD_ARGS! -NullRHI"
set "CMD_ARGS=!CMD_ARGS! -ExecutePythonScript=!SCRIPT_PATH!"

REM ---- Pass config to Python via env vars ----
set "LB_PROJECT_ROOT=!PROJECT_ROOT!"
set "LB_JSON_PATH=%JSON_REL%"
set "LB_MAP_NAME=%MAP_NAME%"
set "LB_MAP_PACKAGE=%MAP_PACKAGE%"
if "!NO_QUIT!"=="1" set "LB_NO_QUIT=1"

REM ---- Print info ----
echo.
echo ============================================
echo   ChildHood Level Builder - Command Line
echo ============================================
echo   UE5:      !UE_EDITOR!
echo   Project:  !UPROJECT_FWD!
echo   JSON:     %JSON_REL%
echo   Map:      %MAP_PACKAGE%/%MAP_NAME%
echo   NullRHI:  %NO_NULL_RHI%
echo ============================================
echo.

REM ---- Dry Run ----
if "%DRY_RUN%"=="1" (
    echo [DRY RUN] Command:
    echo.
    echo "!UE_EDITOR!" "!UPROJECT_FWD!" !CMD_ARGS!
    echo.
    exit /b 0
)

REM ---- Check JSON exists ----
set "JSON_ABS=%PROJECT_ROOT%\%JSON_REL%"
set "JSON_ABS=!JSON_ABS:/=\!"
if not exist "!JSON_ABS!" (
    echo [ERROR] JSON not found: !JSON_ABS!
    echo   Run first: python tools/level-builder/main.py parse
    exit /b 1
)

REM ---- Execute ----
echo [LevelBuilder] Launching UE5 Editor (command line mode)...
echo [LevelBuilder] Editor will auto-save and quit after build.
echo.

"!UE_EDITOR!" "!UPROJECT_FWD!" !CMD_ARGS!

set "EXIT_CODE=!ERRORLEVEL!"
echo.
if "!EXIT_CODE!"=="0" (
    echo [LevelBuilder] Build complete. Editor exited.
) else (
    echo [LevelBuilder] Editor exit code: !EXIT_CODE!
)
exit /b !EXIT_CODE!

:show_help
echo.
echo   ChildHood Level Builder - Command Line Build
echo.
echo   Usage: build_level.bat [options]
echo.
echo   Options:
echo     --json PATH        JSON data file (relative to project root)
echo     --map NAME         Target map asset name (default: LVL_SuburbanV01)
echo     --package PATH     Map package path (default: /Game/Maps)
echo     --no-quit          Keep editor open after build
echo     --no-null-rhi      Show editor window (for debugging)
echo     --dry-run          Print command without executing
echo     --help, -h         Show this help
echo.
echo   Environment:
echo     UE5_ROOT           UE5 install directory
echo.
exit /b 0