#!/usr/bin/env bash
#
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) 2026 AMLOGIC
#
# DMA-allocator build script for AMLbian
# This script builds dma-allocator library for Amlogic SoCs
# Based on compile-dma-allocator.sh functionality

set -e

# Get script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
AMLBIAN_DIR="$(dirname "$(dirname "${SCRIPT_DIR}")")"
BUILD_DIR="${AMLBIAN_DIR}/../build"

# Source common functions
if [[ -f "${AMLBIAN_DIR}/lib/function-common.sh" ]]; then
    source "${AMLBIAN_DIR}/lib/function-common.sh"
fi

# ==============================================================================
# Section 2: Default Configuration
# ==============================================================================

BOARD="${BOARD:-s6-bq201}"
DMA_ALLOCATOR_VERSION="${DMA_ALLOCATOR_VERSION:-1.0.0}"
DMA_ALLOCATOR_SO_VERSION="${DMA_ALLOCATOR_SO_VERSION:-1}"
ARCH="${ARCH:-arm64}"
KERNEL_VERSION="${KERNEL_VERSION:-6.12}"

# ==============================================================================
# Section 4: DMA-allocator Build Functions
# ==============================================================================

function __unset_dma_allocator_config {
    # Clean up any environment variables set during build
    unset CFLAGS
    unset CXXFLAGS
    unset LDFLAGS
}

function __dma_allocator_prepare_source {
    local build_dir="${1}"

    local aml_comp_path="$(amlbian_get_aml_comp_dir)"
    if [[ -z "${aml_comp_path}" ]] || [[ ! -d "${aml_comp_path}" ]]; then
        display_alert "DMA_ALLOCATOR" "aml-comp not found: ${aml_comp_path}" "err"
        exit 1
    fi
    
    local source_dir="${aml_comp_path}/multimedia/gst-aml-utils/dma-allocator"
    
    if [[ ! -d "${source_dir}" ]]; then
        display_alert "DMA_ALLOCATOR" "Source directory not found: ${source_dir}" "err"
        exit 1
    fi
    
    display_alert "DMA_ALLOCATOR" "Copying source from ${source_dir} to ${build_dir}" "info"
    
    # 清空构建目录
    rm -rf "${build_dir}"
    mkdir -p "${build_dir}"
    
    # 复制源代码到构建目录
    cp -r "${source_dir}"/* "${build_dir}/" 2>/dev/null || true
    
    # Check for necessary source files
    if [[ ! -f "${build_dir}/Makefile" ]] && [[ ! -f "${build_dir}/inc/dma_allocator.h" ]]; then
        display_alert "DMA_ALLOCATOR" "Makefile or dma_allocator.h not found in source" "err"
        exit 1
    fi
    
    display_alert "DMA_ALLOCATOR" "Source prepared successfully" "success"
}

function __dma_allocator_build_depend {
    local build_dir="${1}"

    local dependencies=("liblog")

    # liblog
    local liblog_dir="${BUILD_DIR}/.tmp/liblog-build-${ARCH:-arm64}"
    if [ -z "${liblog_dir}" ] || [ ! -d "${liblog_dir}" ]; then
        display_alert "DMA_ALLOCATOR" "liblog not found in ${BUILD_DIR}/.tmp build." "info"
        display_alert "AMLOGIC" "TODO>> Start build liblog " "info"

		if ! (
            source "${SCRIPT_DIR}/build-liblog.sh"
        ); then
            display_alert "ERROR" "build-liblog failed" "err"
            return 1
        fi

        if [ -z "${liblog_dir}" ] || [ ! -d "${liblog_dir}" ]; then
            display_alert "ERROR" "liblog build finished but directory still not found" "err"
            return 1
        fi

    fi

    display_alert "DMA_ALLOCATOR" "liblog dir: ${liblog_dir}" "info"

    # copy
    local log_head_flags="-I${liblog_dir}/build/include"
    export CPPFLAGS="${CPPFLAGS} ${log_head_flags}"
    export CFLAGS="${CFLAGS} ${log_head_flags}"
    export CXXFLAGS="${CXXFLAGS} ${log_head_flags}"

    export LDFLAGS="${LDFLAGS} -L${liblog_dir}/build -L${liblog_dir}/build/output -llog"

    
}

function __dma_allocator_build {
    local build_dir="${1}"
    
    display_alert "DMA_ALLOCATOR" "Starting dma-allocator build..." "info"
    
    if [[ ! -d "${build_dir}" ]]; then
        display_alert "DMA_ALLOCATOR" "Build directory not found: ${build_dir}" "err"
        return 1
    fi
    
    # Set build environment
    ARCH="${ARCH:-arm64}"
    CROSS_COMPILE="${CROSS_COMPILE:-aarch64-linux-gnu-}"
    
    export ARCH="${ARCH}"
    export CROSS_COMPILE="${CROSS_COMPILE}"
    
    # amlbian_checkout_toolchain

    __dma_allocator_build_depend
    
    cd "${build_dir}"
    
    # Create output directory
    local out_dir="${build_dir}/output"
    mkdir -p "${out_dir}"
    
    # Set compiler
    export CC="${CROSS_COMPILE}gcc"
    export CXX="${CROSS_COMPILE}g++"
    export AR="${CROSS_COMPILE}ar"
    
    display_alert "DMA_ALLOCATOR" "Building using Makefile..." "info"
    display_alert "DMA_ALLOCATOR" "CC=${CC}" "debug"
    
    # Run make with OUT_DIR pointing to our output directory
    # Use CFLAGS from environment (set by __dma_allocator_build_depend)
    # Add include path for dma_allocator.h if not already present
    local current_cflags="${CFLAGS}"
    if [[ ! "${current_cflags}" =~ "-I${build_dir}/inc" ]]; then
        current_cflags="${current_cflags} -I${build_dir}/inc"
    fi
    
    # Add kernel headers path for dma-heap.h
    local aml_comp_path="$(amlbian_get_aml_comp_dir)"
    local kernel_headers_path="${aml_comp_path}/kernel/aml-${KERNEL_VERSION}/include"
    local uapi_headers_path="${aml_comp_path}/kernel/aml-${KERNEL_VERSION}/include/uapi"
    
    if [[ -d "${uapi_headers_path}" ]]; then
        current_cflags="${current_cflags} -I${uapi_headers_path}"
        display_alert "DMA_ALLOCATOR" "Added uapi headers path: ${uapi_headers_path}" "debug"
    fi

    if [[ -d "${kernel_headers_path}" ]]; then
        current_cflags="${current_cflags} -I${kernel_headers_path}"
        display_alert "DMA_ALLOCATOR" "Added kernel headers path: ${kernel_headers_path}" "debug"
    fi
    
    make OUT_DIR="${out_dir}" \
        CC="${CC}" \
        CFLAGS="${current_cflags} -fPIC -Wall" \
        LDFLAGS="${LDFLAGS}" \
        -j$(nproc) \
        2>&1 | tee "${out_dir}/make.log" || {
            display_alert "DMA_ALLOCATOR" "Build failed" "err"
            return 1
        }
    
    # Verify the library was created
    if [[ -f "${out_dir}/libdma-allocator.so" ]]; then
        display_alert "DMA_ALLOCATOR" "Build completed successfully" "success"
        display_alert "DMA_ALLOCATOR" "Library: ${out_dir}/libdma-allocator.so" "info"
    else
        display_alert "DMA_ALLOCATOR" "Library file not created" "err"
        return 1
    fi
    
    return 0
}

function __dma_allocator_install {
    local build_dir="${1}"
    local install_dir="${2}"
    
    display_alert "DMA_ALLOCATOR" "Installing dma-allocator..." "info"
    
    local out_dir="${build_dir}/output"
    
    if [[ ! -d "${out_dir}" ]]; then
        display_alert "DMA_ALLOCATOR" "Output directory not found: ${out_dir}" "err"
        return 1
    fi
    
    # Create installation directories
    mkdir -p "${install_dir}/usr/lib"
    mkdir -p "${install_dir}/usr/include"
    
    # Install library
    display_alert "DMA_ALLOCATOR" "Installing library..." "info"
    
    local lib_file="${out_dir}/libdma-allocator.so"
    if [[ -f "${lib_file}" ]]; then
        install -m 0644 "${lib_file}" "${install_dir}/usr/lib/"
        display_alert "DMA_ALLOCATOR" "Installed libdma-allocator.so to ${install_dir}/usr/lib/" "debug"
    else
        display_alert "DMA_ALLOCATOR" "Library file not found: ${lib_file}" "warn"
    fi
    
    # Install header
    display_alert "DMA_ALLOCATOR" "Installing header..." "info"
    local header_file="${build_dir}/inc/dma_allocator.h"
    if [[ -f "${header_file}" ]]; then
        install -m 0644 -D "${header_file}" "${install_dir}/usr/include/"
        display_alert "DMA_ALLOCATOR" "Installed dma_allocator.h to ${install_dir}/usr/include/" "debug"
    else
        display_alert "DMA_ALLOCATOR" "Header file not found: ${header_file}" "warn"
    fi
    
    display_alert "DMA_ALLOCATOR" "Installation completed successfully" "success"
    return 0
}

function __dma_allocator_create_deb {
    local build_dir="${1}"
    local install_dir="${2}"
    
    # Package details
    local pkg_name="libdma-allocator"
    local version="${DMA_ALLOCATOR_VERSION}"
    local architecture="${ARCH:-arm64}"
    local maintainer="Amlbian Builder <build@amlbian.com>"
    local description="Amlogic DMA buffer allocator library"
    local description_long="This package provides the Amlogic DMA buffer allocator library for multimedia applications."
    
    display_alert "DMA_ALLOCATOR" "Creating Debian package for ${pkg_name} ${version}..." "info"
    
    # Create Debian package directory structure
    local deb_dir="${build_dir}/deb/${pkg_name}-${version}"
    local debian_dir="${deb_dir}/DEBIAN"
    
    mkdir -p "${debian_dir}"
    
    # Copy installed files to package directory
    if [[ -d "${install_dir}" ]] && [[ "$(ls -A "${install_dir}")" ]]; then
        cp -r "${install_dir}"/* "${deb_dir}/" 2>/dev/null || true
        display_alert "DMA_ALLOCATOR" "Copied installed files to ${deb_dir}" "info"
    else
        display_alert "DMA_ALLOCATOR" "No installed files found in ${install_dir}" "warning"
        return 0
    fi
    
    # Create control file
    cat > "${debian_dir}/control" <<EOF
Package: ${pkg_name}
Version: ${version}
Architecture: ${architecture}
Maintainer: ${maintainer}
Description: ${description}
 ${description_long}
Depends: libc6, liblog
Section: libs
Priority: optional
EOF
    
    # Create postinst script for ldconfig
    cat > "${debian_dir}/postinst" << 'POSTINST_EOF'
#!/bin/sh
set -e

if [ "$1" = "configure" ]; then
    # Update ldconfig cache
    if command -v ldconfig >/dev/null 2>&1; then
        ldconfig
    fi
fi

exit 0
POSTINST_EOF
    
    chmod 755 "${debian_dir}/postinst"
    
    # Create prerm script
    cat > "${debian_dir}/prerm" << 'PRERM_EOF'
#!/bin/sh
set -e

if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
    # Update ldconfig
    if command -v ldconfig >/dev/null 2>&1; then
        ldconfig
    fi
fi

exit 0
PRERM_EOF
    
    chmod 755 "${debian_dir}/prerm"
    
    display_alert "DMA_ALLOCATOR" "Building Debian package..." "info"
    
    # Build Debian package
    cd "${build_dir}/deb"
    dpkg-deb --build "${pkg_name}-${version}"
    
    local deb_file="${pkg_name}-${version}.deb"
    if [[ -f "${deb_file}" ]]; then
        local output_dir="${BUILD_DIR}/output"
        mkdir -p "${output_dir}"
        mv "${deb_file}" "${output_dir}/linux-${pkg_name}-${BOARD}-amlbian_${version}_${architecture}.deb"
        display_alert "DMA_ALLOCATOR" "Debian package created: ${output_dir}/linux-${pkg_name}-${BOARD}-amlbian_${version}_${architecture}.deb" "success"
    else
        display_alert "DMA_ALLOCATOR" "Failed to build Debian package" "err"
        return 1
    fi
    
    return 0
}

function amlbian_build_dma_allocator {
    if ! is_unit_enabled "dma-allocator"; then
        display_alert "[SKIP] >> dma-allocator disable in BUILD_UNITS" "" "info"
        return
    fi
    display_alert "AMLOGIC: Building dma-allocator ${DMA_ALLOCATOR_VERSION} ${BOARD}" "info"
    
    # Define all directory paths (in .tmp directory)
    local build_root="${BUILD_DIR}/.tmp/dma-allocator-build-${ARCH:-arm64}"
    local build_dir="${build_root}/build"        # Build directory with source code
    local install_dir="${build_root}/install"    # Install directory

    rm -rf "${build_root}" 

    # 创建目录
    mkdir -p "${build_dir}" "${install_dir}"

    display_alert "AMLOGIC: build_dir  ${build_dir}" "info"
    display_alert "AMLOGIC: install_dir  ${install_dir}" "info"
    display_alert "AMLOGIC: output_dir  ${BUILD_DIR}/output" "info"

    # 准备源代码
    __dma_allocator_prepare_source "${build_dir}"
    
    # 构建
    if ! __dma_allocator_build "${build_dir}"; then
        display_alert "AMLOGIC: dma-allocator build failed" "err"
        return 1
    fi
    
    # 安装到安装目录
    if ! __dma_allocator_install "${build_dir}" "${install_dir}"; then
        display_alert "AMLOGIC: dma-allocator installation failed" "err"
        return 1
    fi

    display_alert "AMLOGIC: Creating Debian package..." "info"
    __dma_allocator_create_deb "${build_dir}" "${install_dir}"

    __unset_dma_allocator_config

    return 0
}

# ==============================================================================
# Section 5: Main
# ==============================================================================

display_alert "AMLIbian DMA-allocator Build Script" "Version: ${DMA_ALLOCATOR_VERSION}, Board: ${BOARD}" "info"

amlbian_build_dma_allocator

display_alert "AMLOGIC: dma-allocator build completed" "${BUILD_DIR}/output" "info"

# ==============================================================================
# End of build-dma-allocator.sh
# ==============================================================================