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:: ================================================================================================
:: Android dav1d Library Build Script
:: ================================================================================================
:: Purpose: Build dav1d library for Android ARM64 platform
:: Target:  lib/android-arm64-v8a/dav1d/
:: Author:  Generated with Claude Code
::
:: Prerequisites:
::   1. Android NDK r25+ installed
::   2. Python with meson and ninja installed: pip install meson ninja
::   3. dav1d source code cloned in parent directory
::
:: Usage:
::   1. Set Android NDK environment variable:
::      set ANDROID_NDK_HOME=C:\Android\android-ndk-r25c
::   2. dav1d source should be available at:
::      oss/dav1d/
::   3. Run this script:
::      build_dav1d_android.bat        (for ARM64)
::      build_dav1d_android.bat arm32  (for ARM32)
::
:: Output:
::   - lib/android-arm64-v8a/dav1d/libdav1d.a (ARM64)
::   - lib/android-armeabi-v7a/dav1d/libdav1d.a (ARM32)
::   - include/dav1d/*.h
:: ================================================================================================

echo.
echo ========================================
echo  Android dav1d Library Build Script
echo ========================================
echo.

:: Set project root directory
set "PROJECT_ROOT=%~dp0"
set "PROJECT_ROOT=%PROJECT_ROOT:~0,-1%"

:: Set Android build configuration (default to ARM64, can be overridden)
if "%1"=="arm32" (
    set "ANDROID_ABI=armeabi-v7a"
    set "ANDROID_TOOLCHAIN_PREFIX=armv7a-linux-androideabi"
    set "MESON_CPU_FAMILY=arm"
    set "MESON_CPU=armv7"
) else (
    set "ANDROID_ABI=arm64-v8a"
    set "ANDROID_TOOLCHAIN_PREFIX=aarch64-linux-android"
    set "MESON_CPU_FAMILY=aarch64"
    set "MESON_CPU=aarch64"
)
set "ANDROID_PLATFORM=android-29"
set "ANDROID_API_LEVEL=29"

:: Set output directory
set "OUTPUT_DIR=%PROJECT_ROOT%\lib\android-%ANDROID_ABI%\dav1d"

:: dav1d source directory
set "DAV1D_SOURCE_DIR=%PROJECT_ROOT%\oss\dav1d"
set "BUILD_DIR=%PROJECT_ROOT%\build-android\dav1d"

echo Project Root: %PROJECT_ROOT%
echo dav1d Source: %DAV1D_SOURCE_DIR%
echo Build Directory: %BUILD_DIR%
echo Output Directory: %OUTPUT_DIR%
echo Android ABI: %ANDROID_ABI%
echo Android API Level: %ANDROID_API_LEVEL%
echo.

:: Check if Android NDK is set
if "%ANDROID_NDK_HOME%"=="" (
    if "%ANDROID_NDK_ROOT%"=="" (
        echo ❌ Error: Android NDK not found
        echo Please set ANDROID_NDK_HOME or ANDROID_NDK_ROOT environment variable
        echo Example: set ANDROID_NDK_HOME=C:\Android\android-ndk-r25c
        exit /b 1
    ) else (
        set "ANDROID_NDK_HOME=%ANDROID_NDK_ROOT%"
    )
)

echo ✅ Android NDK found: %ANDROID_NDK_HOME%

:: Check if dav1d source directory exists
if not exist "%DAV1D_SOURCE_DIR%" (
    echo ❌ Error: dav1d source directory not found: %DAV1D_SOURCE_DIR%
    echo Please ensure dav1d source is available at:
    echo   %PROJECT_ROOT%\oss\dav1d\
    exit /b 1
)

echo ✅ dav1d source found: %DAV1D_SOURCE_DIR%

:: Check for required tools
where meson >nul 2>&1
if errorlevel 1 (
    echo ❌ Error: meson not found in PATH
    echo Please install meson: pip install meson
    exit /b 1
)

where ninja >nul 2>&1
if errorlevel 1 (
    echo ❌ Error: ninja not found in PATH
    echo Please install ninja: pip install ninja
    exit /b 1
)

echo ✅ Build tools found: meson, ninja

:: Create build directory
if exist "%BUILD_DIR%" (
    echo 🧹 Cleaning existing build directory...
    rmdir /s /q "%BUILD_DIR%"
)

mkdir "%BUILD_DIR%"
if errorlevel 1 (
    echo ❌ Error: Failed to create build directory
    exit /b 1
)

:: Create output directory
if not exist "%OUTPUT_DIR%" (
    mkdir "%OUTPUT_DIR%"
    if errorlevel 1 (
        echo ❌ Error: Failed to create output directory
        exit /b 1
    )
)

:: Set Android toolchain paths
set "ANDROID_TOOLCHAIN_DIR=%ANDROID_NDK_HOME%\toolchains\llvm\prebuilt\windows-x86_64"
set "ANDROID_SYSROOT=%ANDROID_TOOLCHAIN_DIR%\sysroot"

:: Create meson cross-compilation file for Android
set "CROSS_FILE=%BUILD_DIR%\android-%ANDROID_ABI%.txt"

echo.
echo 📝 Creating meson cross-compilation file for %ANDROID_ABI% (with 16 KB page alignment)...

(
echo [binaries]
echo c = '%ANDROID_TOOLCHAIN_DIR%\bin\%ANDROID_TOOLCHAIN_PREFIX%%ANDROID_API_LEVEL%-clang.cmd'
echo cpp = '%ANDROID_TOOLCHAIN_DIR%\bin\%ANDROID_TOOLCHAIN_PREFIX%%ANDROID_API_LEVEL%-clang++.cmd'
echo ar = '%ANDROID_TOOLCHAIN_DIR%\bin\llvm-ar.exe'
echo strip = '%ANDROID_TOOLCHAIN_DIR%\bin\llvm-strip.exe'
echo pkg-config = 'pkg-config'
echo.
echo [host_machine]
echo system = 'android'
echo cpu_family = '%MESON_CPU_FAMILY%'
echo cpu = '%MESON_CPU%'
echo endian = 'little'
echo.
echo [properties]
echo sys_root = '%ANDROID_SYSROOT%'
echo.
echo [built-in options]
echo c_args = ['-DANDROID', '-D__ANDROID_API__=%ANDROID_API_LEVEL%']
echo cpp_args = ['-DANDROID', '-D__ANDROID_API__=%ANDROID_API_LEVEL%']
echo c_link_args = ['-Wl,-z,max-page-size=16384', '-Wl,-z,common-page-size=16384']
echo cpp_link_args = ['-Wl,-z,max-page-size=16384', '-Wl,-z,common-page-size=16384']
) > "%CROSS_FILE%"

echo ✅ Created cross-compilation file: %CROSS_FILE%

echo.
echo 🔧 Configuring dav1d build with meson...
echo.

:: Change to dav1d source directory
pushd "%DAV1D_SOURCE_DIR%"

:: Configure meson cross-compilation for Android (static library for embedding)
meson setup "%BUILD_DIR%" ^
    --cross-file="%CROSS_FILE%" ^
    --default-library=static ^
    --buildtype=release ^
    --strip ^
    -Denable_tools=false ^
    -Denable_tests=false ^
    -Denable_examples=false ^
    -Denable_docs=false ^
    -Db_lto=true ^
    -Db_ndebug=true

if errorlevel 1 (
    echo ❌ Error: meson configuration failed
    popd
    exit /b 1
)

echo.
echo 🔨 Building dav1d library...
echo.

:: Build with ninja
ninja -C "%BUILD_DIR%" -j%NUMBER_OF_PROCESSORS%

if errorlevel 1 (
    echo ❌ Error: Build failed
    popd
    exit /b 1
)

popd

echo.
echo 📦 Installing dav1d to output directory...
echo.

:: Copy built library and headers
if exist "%BUILD_DIR%\src\libdav1d.a" (
    copy "%BUILD_DIR%\src\libdav1d.a" "%OUTPUT_DIR%\"
    if errorlevel 1 (
        echo ❌ Error: Failed to copy libdav1d.a
        exit /b 1
    )
    echo ✅ Copied: libdav1d.a
) else (
    echo ❌ Error: libdav1d.a not found in build directory
    dir "%BUILD_DIR%\src"
    exit /b 1
)

:: Copy headers
set "HEADER_OUTPUT_DIR=%PROJECT_ROOT%\include\dav1d"
if not exist "%HEADER_OUTPUT_DIR%" (
    mkdir "%HEADER_OUTPUT_DIR%"
)

:: Copy public headers from dav1d source
if exist "%DAV1D_SOURCE_DIR%\include\dav1d\*.h" (
    copy "%DAV1D_SOURCE_DIR%\include\dav1d\*.h" "%HEADER_OUTPUT_DIR%\"
    if errorlevel 1 (
        echo ❌ Error: Failed to copy dav1d headers
        exit /b 1
    )
    echo ✅ Copied: dav1d headers to include/dav1d/
)

:: Copy generated config header if exists
if exist "%BUILD_DIR%\include\dav1d\version.h" (
    copy "%BUILD_DIR%\include\dav1d\version.h" "%HEADER_OUTPUT_DIR%\"
    echo ✅ Copied: version.h
)

:: Display build summary
echo.
echo ========================================
echo  Build Summary
echo ========================================
echo Library: %OUTPUT_DIR%\libdav1d.a
echo Headers: %HEADER_OUTPUT_DIR%\*.h
echo Platform: Android %ANDROID_ABI% (API %ANDROID_API_LEVEL%)
echo Build Type: Release with LTO
echo.

:: Verify output files
if exist "%OUTPUT_DIR%\libdav1d.a" (
    echo ✅ Success: Android dav1d library built successfully

    :: Display library info using file command if available
    where file >nul 2>&1
    if not errorlevel 1 (
        echo.
        echo 📋 Library Information:
        file "%OUTPUT_DIR%\libdav1d.a"
    )

    :: Display file size
    for %%F in ("%OUTPUT_DIR%\libdav1d.a") do (
        echo Library Size: %%~zF bytes
    )
) else (
    echo ❌ Error: Build completed but libdav1d.a not found in output directory
    exit /b 1
)

echo.
echo 🎯 Next Steps:
echo   1. The Android dav1d library is ready for use in VavCore
echo   2. Build VavCore Android library: platforms\android\vavcore\build.sh
echo   3. Test the library with Android VavCore integration
echo.

endlocal
exit /b 0