#!/usr/bin/env bash
#
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) 2026 AMLOGIC
#
# Screencapture build script for AMLbian
# This script builds screencapture utility for Amlogic SoCs
# Based on aml-screencapture.bb functionality

set -e

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

# 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="${BOARD:-s6-bq201}"
SCREENCAPTURE_VERSION="${SCREENCAPTURE_VERSION:-1.0.0}"
: "${ARCH:=arm64}"
KERNEL_VERSION="${KERNEL_VERSION:-6.12}"

# ==============================================================================
# Section 4: Screencapture Build Functions
# ==============================================================================

function __unset_screencapture_config {
    # Clean up any environment variables set during build
    unset CFLAGS
    unset CXXFLAGS
    unset LDFLAGS
    unset CPPFLAGS
    unset SYSROOT
    unset PKG_CONFIG
    unset PKG_CONFIG_SYSROOT_DIR
    unset PKG_CONFIG_LIBDIR
    unset PKG_CONFIG_PATH
}

function __screencapture_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 "SCREENCAPTURE" "aml-comp not found: ${aml_comp_path}" "err"
        exit 1
    fi
    
    local source_dir="${aml_comp_path}/vendor/amlogic/linux_sample_app/aml-screencapture"
    
    if [[ ! -d "${source_dir}" ]]; then
        display_alert "SCREENCAPTURE" "Source directory not found: ${source_dir}" "err"
        exit 1
    fi
    
    display_alert "SCREENCAPTURE" "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}/ScreenCapture.cpp" ]]; then
        display_alert "SCREENCAPTURE" "Makefile or ScreenCapture.cpp not found in source" "err"
        exit 1
    fi
    
    display_alert "SCREENCAPTURE" "Source prepared successfully" "success"
}

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

    # Check if ROOTFS_TEMP exists, use it as sysroot, otherwise error
    local SYSROOT=""
    
    if [[ -n "${ROOTFS_TEMP}" ]] && [[ -d "${ROOTFS_TEMP}" ]] && [[ -d "${ROOTFS_TEMP}/usr/lib/aarch64-linux-gnu" ]]; then
        SYSROOT="${ROOTFS_TEMP}"
        display_alert "SCREENCAPTURE" "Using ROOTFS_TEMP as sysroot: ${SYSROOT}" "info"
    else
        display_alert "SCREENCAPTURE" "ROOTFS_TEMP not found or invalid: ${ROOTFS_TEMP}" "err"
        display_alert "SCREENCAPTURE" "ROOTFS_TEMP should be created by create_base_rootfs function" "err"
        return 1
    fi

    # Use sysroot configuration
    display_alert "SCREENCAPTURE" "Using sysroot: ${SYSROOT}" "info"
    
    export PKG_CONFIG=/usr/bin/pkg-config
    export PKG_CONFIG_SYSROOT_DIR="${SYSROOT}"
    export PKG_CONFIG_LIBDIR="${SYSROOT}/usr/lib/aarch64-linux-gnu/pkgconfig:${SYSROOT}/usr/share/pkgconfig"
    unset PKG_CONFIG_PATH

    # Set up flags with sysroot
    export CPPFLAGS="${CPPFLAGS} --sysroot=${SYSROOT}"
    export CFLAGS="${CFLAGS} --sysroot=${SYSROOT} -fPIC"
    export CXXFLAGS="${CXXFLAGS} --sysroot=${SYSROOT} -fPIC"
    export LDFLAGS="${LDFLAGS} --sysroot=${SYSROOT}"

    # 根据 bb 文件中的 EXTRA_OEMAKE，添加额外的编译标志
    local extra_cflags="-Wno-unused-result -Wno-unused-variable -Wno-unused-function -Os"
    export CFLAGS="${CFLAGS} ${extra_cflags}"
    export CXXFLAGS="${CXXFLAGS} ${extra_cflags}"
    
    # 链接标志
    export LDFLAGS="${LDFLAGS} -lstdc++ -lm -lpthread"
    
    # 添加 sysroot 中的头文件路径
    include_flags="-I${SYSROOT}/usr/include/aarch64-linux-gnu"
    
    export CPPFLAGS="${CPPFLAGS} ${include_flags}"
    export CFLAGS="${CFLAGS} ${include_flags}"
    export CXXFLAGS="${CXXFLAGS} ${include_flags}"

    export LDFLAGS="${LDFLAGS} -L${SYSROOT}/usr/lib/aarch64-linux-gnu -L${SYSROOT}/usr/aarch64-linux-gnu/lib"
    export LDFLAGS="${LDFLAGS} -Wl,-rpath-link,${SYSROOT}/usr/lib/aarch64-linux-gnu"
    
    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 "SCREENCAPTURE" "Building using Makefile..." "info"
    display_alert "SCREENCAPTURE" "CC=${CC}" "debug"
    
    # 运行 make，根据源码中的 Makefile
    make OUT_DIR="${out_dir}" \
        CC="${CC}" \
        CXX="${CXX}" \
        CXXFLAGS="${CXXFLAGS} -std=c++14 -Wall -Wextra -fPIC -Os -D_FILE_OFFSET_BITS=64" \
        LDFLAGS="${LDFLAGS}" \
        -j$(nproc) \
        2>&1 | tee "${out_dir}/make.log" || {
            display_alert "SCREENCAPTURE" "Build failed" "err"
            return 1
        }
    
    # Verify the executable was created
    if [[ -f "${out_dir}/screencapture" ]]; then
        display_alert "SCREENCAPTURE" "Build completed successfully" "success"
        display_alert "SCREENCAPTURE" "Executable: ${out_dir}/screencapture" "info"
    else
        display_alert "SCREENCAPTURE" "Executable file not created" "err"
        return 1
    fi
    
    return 0
}

function __screencapture_install {
    local build_dir="${1}"
    local install_dir="${2}"
    
    display_alert "SCREENCAPTURE" "Installing screencapture..." "info"
    
    local out_dir="${build_dir}/output"
    
    if [[ ! -d "${out_dir}" ]]; then
        display_alert "SCREENCAPTURE" "Output directory not found: ${out_dir}" "err"
        return 1
    fi
    
    # Create installation directories
    # 根据 bb 文件中的 do_install()，只安装到 bindir
    mkdir -p "${install_dir}/usr/bin"
    
    # Install executable
    display_alert "SCREENCAPTURE" "Installing executable..." "info"
    
    local exec_file="${out_dir}/screencapture"
    if [[ -f "${exec_file}" ]]; then
        install -m 0755 "${exec_file}" "${install_dir}/usr/bin/"
        display_alert "SCREENCAPTURE" "Installed screencapture to ${install_dir}/usr/bin/" "debug"
    else
        display_alert "SCREENCAPTURE" "Executable file not found: ${exec_file}" "warn"
    fi
    
    display_alert "SCREENCAPTURE" "Installation completed successfully" "success"
    return 0
}

function __screencapture_create_deb {
    local build_dir="${1}"
    local install_dir="${2}"
    
    # Package details
    local pkg_name="screencapture"
    local version="${SCREENCAPTURE_VERSION}"
    local architecture="${ARCH:-arm64}"
    local maintainer="Amlbian Builder <build@amlbian.com>"
    local description="Amlogic screencapture utility"
    local description_long="This package provides the Amlogic screencapture utility for capturing screen content."
    
    display_alert "SCREENCAPTURE" "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 "SCREENCAPTURE" "Copied installed files to ${deb_dir}" "info"
    else
        display_alert "SCREENCAPTURE" "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, libstdc++6
Section: utils
Priority: optional
EOF
    
    # Create postinst script (not needed for simple executable)
    cat > "${debian_dir}/postinst" << 'POSTINST_EOF'
#!/bin/sh
set -e

# No special post-installation steps needed

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

# No special pre-removal steps needed

exit 0
PRERM_EOF
    
    chmod 755 "${debian_dir}/prerm"
    
    display_alert "SCREENCAPTURE" "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 "${output_dir}"
        local final_deb_name="linux-${pkg_name}-${BOARD}-amlbian_${version}_${architecture}.deb"
        mv "${deb_file}" "${output_dir}/${final_deb_name}"
        chmod 755 "${output_dir}/${final_deb_name}"
        
        # 验证文件确实存在
        if [[ -f "${output_dir}/${final_deb_name}" ]]; then
            display_alert "SCREENCAPTURE" "Debian package created: ${output_dir}/${final_deb_name}" "success"
            # 简单的文件大小检查，避免复杂的命令
            if [[ -s "${output_dir}/${final_deb_name}" ]]; then
                display_alert "SCREENCAPTURE" "File created successfully (non-empty)" "debug"
            else
                display_alert "SCREENCAPTURE" "WARNING: File is empty" "warn"
            fi
        else
            display_alert "SCREENCAPTURE" "ERROR: Debian package not found after move: ${output_dir}/${final_deb_name}" "err"
            return 1
        fi
    else
        display_alert "SCREENCAPTURE" "Failed to build Debian package" "err"
        return 1
    fi
    
    return 0
}

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

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

    __unset_screencapture_config

    chmod 777 "${build_root}"

    return 0
}

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

display_alert "AMLIbian Screencapture Build Script" "Version: ${SCREENCAPTURE_VERSION}, Board: ${BOARD}" "info"

amlbian_build_screencapture

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

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