#!/usr/bin/env bash
#
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) 2026 AMLOGIC
#
# Libion build script for AMLbian
# This script builds libion library for Amlogic SoCs

set -e

# Get script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
AMLBIAN_DIR="$(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="${BOARD:-s6-bq201}"
DEB_VERSION="1.0"
ARCH="${ARCH:-arm64}"

# ==============================================================================
# Section 4: Libion Build Functions
# ==============================================================================

function amlbian_checkout_toolchain() {
    
    display_alert "Ignore check toolchain after set_external_toolchain in common setting"
    return 0

    # # Check default gcc version before switching toolchain
    # local need_new_toolchain=1
    # local default_gcc_version=""
    
    # # Try to get default gcc version
    # if command -v gcc &> /dev/null; then
    #     default_gcc_version=$(aarch64-linux-gnu-gcc --version | head -n1 | grep -oP '\d+\.\d+\.\d+' | head -n1)
    #     display_alert "TOOLCHAIN" "Default gcc version: ${default_gcc_version}" "info"
        
    #     # Check if version is >= 5.1.0
    #     if [[ -n "${default_gcc_version}" ]]; then
    #         # Simple version comparison
    #         local major_version=$(echo "${default_gcc_version}" | cut -d. -f1)
    #         local minor_version=$(echo "${default_gcc_version}" | cut -d. -f2)
            
    #         if [[ ${major_version} -gt 5 ]] || ([[ ${major_version} -eq 5 ]] && [[ ${minor_version} -ge 1 ]]); then
    #             display_alert "TOOLCHAIN" "Default gcc version ${default_gcc_version} >= 5.1.0, no need for new toolchain" "info"
    #             need_new_toolchain=0
    #         else
    #             display_alert "TOOLCHAIN" "Default gcc version ${default_gcc_version} < 5.1.0, will try new toolchain" "info"
    #         fi
    #     fi
    # else
    #     display_alert "TOOLCHAIN" "gcc not found in PATH" "warn" 
    # fi
    
    # # Only switch to new toolchain if needed
    # if [[ ${need_new_toolchain} -eq 1 ]]; then
    #     #local new_toolchain_path="/opt/gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu/bin"
    #     local new_toolchain_path="/opt/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin"
    #     if [[ -d "${new_toolchain_path}" ]]; then
    #         display_alert "TOOLCHAIN" "Using new toolchain from: ${new_toolchain_path}" "info"
    #         export PATH="${new_toolchain_path}:${PATH}"
    #         # Check if gcc exists in the new toolchain
    #         if [[ -f "${new_toolchain_path}/aarch64-linux-gnu-gcc" ]]; then
    #             display_alert "TOOLCHAIN" "Found cross-compiler: ${new_toolchain_path}/aarch64-linux-gnu-gcc" "info"
    #         else
    #             display_alert "TOOLCHAIN" "Cross-compiler not found in new toolchain, using default" "warn" 
    #         fi
    #     else
    #         display_alert "TOOLCHAIN" "New toolchain directory not found: ${new_toolchain_path}" "warn" 
    #     fi
    # fi
}

function __unset_libion_config {
    # Clean up any environment variables set during build
    unset EXTRA_OEMAKE
    unset SYSROOT
}

function __libion_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 "LIBION" "aml-comp not found: ${aml_comp_path}" "err"
        exit 1
    fi
    
    local source_dir="${aml_comp_path}/hardware/amlogic/libion"
    
    if [[ ! -d "${source_dir}" ]]; then
        display_alert "LIBION" "Source directory not found: ${source_dir}" "err"
        exit 1
    fi
    
    display_alert "LIBION" "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}/"
    
    display_alert "LIBION" "Source prepared successfully" "success"
}

function __libion_build {
    local build_dir="${1}"
    local install_dir="${2}"
    
    display_alert "LIBION" "Starting libion build..." "info"
    
    # 检查源目录
    if [[ ! -d "${build_dir}" ]]; then
        display_alert "LIBION" "Build directory not found: ${build_dir}" "err"
        return 1
    fi
    
    # 设置编译环境
    export ARCH=arm64
    export CROSS_COMPILE=${CROSS_COMPILE:-aarch64-linux-gnu-}
    
    amlbian_checkout_toolchain
    
    # 设置EXTRA_OEMAKE参数（参考libion.bb）
    local EXTRA_OEMAKE="OUT_DIR=${build_dir} LIBION_STAGING_DIR=${install_dir} CROSS=${CROSS_COMPILE} TARGET_DIR=${install_dir} STAGING_DIR=${install_dir} DESTDIR=${install_dir} INSTALL_DIR=${install_dir}/usr/lib"
    
    # 进入源码目录
    cd "${build_dir}"
    
    display_alert "LIBION" "Building libion library..." "info"
    
    # 编译命令，使用EXTRA_OEMAKE参数
    make -j$(nproc) ${EXTRA_OEMAKE} \
        CROSS_COMPILE=${CROSS_COMPILE:-aarch64-linux-gnu-} \
        CC=${CC:-${CROSS_COMPILE}gcc} \
        ARCH=arm64 2>&1 | tee build.log || {
            display_alert "LIBION" "Build failed" "err"
            return 1
        }
    
    display_alert "LIBION" "Build completed successfully" "success"
    return 0
}

function __libion_install {
    local build_dir="${1}"
    local install_dir="${2}"
    
    display_alert "LIBION" "Installing libion library..." "info"
    
    # 创建安装目录结构
    mkdir -p "${install_dir}/usr/include"
    mkdir -p "${install_dir}/usr/lib/${LIB_DIR}"
    
    # 安装头文件
    if [[ -d "${build_dir}/include" ]]; then
        install -m 0644 -D "${build_dir}/include/ion/ion.h" "${install_dir}/usr/include/"
        install -m 0644 -D "${build_dir}/include/ion/IONmem.h" "${install_dir}/usr/include/"
        display_alert "LIBION" "Headers installed to ${install_dir}/usr/include" "info"
    fi
    
    # 安装库文件
    if [[ -f "${build_dir}/libion.so" ]]; then
        install -m 0644 -D "${build_dir}/libion.so" "${install_dir}/usr/lib/${LIB_DIR}/"
        display_alert "LIBION" "Library installed to ${install_dir}/usr/lib/${LIB_DIR}" "info"
    else
        # 尝试在其他位置查找库文件
        local lib_file=$(find "${build_dir}" -name "libion.so" -type f | head -1)
        if [[ -f "${lib_file}" ]]; then
            install -m 0644 -D "${lib_file}" "${install_dir}/usr/lib/${LIB_DIR}/"
            display_alert "LIBION" "Library installed from ${lib_file}" "info"
        else
            display_alert "LIBION" "libion.so not found in build directory" "warn"
        fi
    fi
    
    display_alert "LIBION" "Installation completed" "success"
    return 0
}

function __libion_create_deb {
    local build_dir="${1}"
    local install_dir="${2}"
    
    # 设置必要的变量
    local pkg_name="libion"
    local version="${DEB_VERSION}"
    local architecture="${ARCH}"
    local maintainer="Armbian Build <build@armbian.com>"
    local description="ION (I/O Memory Manager) library for Amlogic SoCs"
    
    display_alert "LIBION" "Creating Debian package for ${pkg_name} ${version}..." "info"
    
    # 创建Debian包控制文件
    local deb_dir="${build_dir}/deb/${pkg_name}-${version}"
    local debian_dir="${deb_dir}/DEBIAN"
    
    mkdir -p "${debian_dir}"
    
    # 将安装目录的内容复制到debian-root
    if [[ -d "${install_dir}" ]] && [[ "$(ls -A "${install_dir}")" ]]; then
        cp -r "${install_dir}"/* "${deb_dir}/" 2>/dev/null || true
        display_alert "LIBION" "Copied installed files to ${deb_dir}" "info"
    else
        display_alert "LIBION" "No installed files found in ${install_dir}" "warn"
        return 0
    fi
    
    # 创建control文件
    cat > "${debian_dir}/control" <<EOF
Package: ${pkg_name}
Version: ${version}
Architecture: ${architecture}
Maintainer: ${maintainer}
Description: ${description}
 This package provides ION (I/O Memory Manager) library for Amlogic SoCs.
 ION is a memory manager that provides a way to share memory between
 userspace and kernel space, and between different hardware components.
 Includes:
  * libion.so - ION library
  * ion.h - ION header file
  * IONmem.h - ION memory header file
Depends:
Section: libs
Priority: optional
EOF
    
    # 创建postinst脚本，用于更新ldconfig
    cat > "${debian_dir}/postinst" <<EOF
#!/bin/sh
set -e
  
if [ "\$1" = "configure" ]; then
    # 更新ldconfig缓存
    if command -v ldconfig >/dev/null 2>&1; then
        ldconfig
    fi
    
    echo "Libion library installed successfully"
fi

exit 0
EOF
    
    chmod 755 "${debian_dir}/postinst"
    
    # 创建prerm脚本
    cat > "${debian_dir}/prerm" <<EOF
#!/bin/sh
set -e

if [ "\$1" = "remove" ] || [ "\$1" = "deconfigure" ]; then
    echo "Removing libion library"
fi

exit 0
EOF
    
    chmod 755 "${debian_dir}/prerm"
    
    display_alert "LIBION" "Building Debian package..." "info"
    
    # 构建Debian包
    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 "LIBION" "Debian package created: ${output_dir}/linux-${pkg_name}-${BOARD}-amlbian_${version}_${architecture}.deb" "success"
    else
        display_alert "LIBION" "Failed to build Debian package" "err"
        return 1
    fi
    
    return 0
}

function amlbian_build_libion {
    if ! is_unit_enabled "libion"; then
        display_alert "[SKIP] >> libion disable in BUILD_UNITS" "" "info"
        return
    fi
    display_alert "AMLOGIC: Building libion ${DEB_VERSION} ${BOARD}" "info"
    
    # Define all directory paths (in .tmp directory)
    local build_root="${BUILD_DIR}/.tmp/libion-build-${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
    __libion_prepare_source "${build_dir}"
    
    # 构建
    if ! __libion_build "${build_dir}" "${install_dir}"; then
        display_alert "AMLOGIC: Libion build failed" "err"
        return 1
    fi
    
    # 安装到安装目录
    if ! __libion_install "${build_dir}" "${install_dir}"; then
        display_alert "AMLOGIC: Libion installation failed" "err"
        return 1
    fi

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

    __unset_libion_config

    return 0
}

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

display_alert "AMLIbian Libion Build Script" "Version: ${PKG_VERSION}, Board: ${BOARD}" "info"

amlbian_build_libion

display_alert "AMLOGIC: Libion build completed" "${BUILD_DIR}/output" "info"

# ==============================================================================
# End of build-libion.sh
# ==============================================================================