#!/bin/bash

# 检测是否安装了 KDE Plasma 桌面环境
# 通过检查系统中是否存在相关的 desktop 文件或关键程序
is_kde_plasma() {
    # 检查 KDE Plasma
    if [ -f /usr/share/xsessions/plasma.desktop ] || \
       [ -f /usr/share/xsessions/plasma-xorg.desktop ] || \
       [ -f /usr/share/xsessions/plasma-wayland.desktop ] || \
       [ -f /usr/local/share/xsessions/plasma.desktop ] || \
       [ -f /usr/local/share/xsessions/plasma-xorg.desktop ] || \
       [ -f /usr/local/share/xsessions/plasma-wayland.desktop ] || \
       command -v startplasma-x11 >/dev/null 2>&1 || \
       command -v startplasma-wayland >/dev/null 2>&1 || \
       command -v plasmashell >/dev/null 2>&1; then
        return 0
    fi
    return 1
}

# 确定目标目录
if grep -q "Kylin" /etc/os-release; then
    TARGET_BASE="/usr/share"
    APP_TARGET_DIR="$TARGET_BASE/applications"
    echo "检测到麒麟系统，使用目标目录: $TARGET_BASE"
else
    TARGET_BASE="/usr/local/share"
    # 检测是否为 KDE Plasma 桌面环境
    if is_kde_plasma; then
        APP_TARGET_DIR="$TARGET_BASE/applications/apm"
        echo "检测到 KDE Plasma 桌面环境，使用目标目录: $APP_TARGET_DIR"
    else
        APP_TARGET_DIR="$TARGET_BASE/applications"
        echo "使用标准目标目录: $APP_TARGET_DIR"
    fi
fi

function ensure_dir() {
    local dir="$1"
    
    # 检查目录是否为空
    if [ -z "$dir" ]; then
        echo "错误: 目录路径不能为空"
        return 1
    fi
    
    # 检查目录是否存在
    if [ ! -d "$dir" ]; then
        echo "目录 '$dir' 不存在，正在创建..."
        if mkdir -p "$dir"; then
            echo "成功创建目录 '$dir'"
            return 0
        else
            echo "错误: 无法创建目录 '$dir'"
            return 1
        fi
    else
        return 0
    fi
}

# 函数：检查目录并创建符号链接
process_directory() {
    local source_dir="$1"
    local target_dir="$2"
    local name="$3"
    
    if [ -d "$source_dir" ] && [ -n "$(ls -A "$source_dir")" ]; then
        ln -sv $source_dir/* "$target_dir" 2>/dev/null
        find "$target_dir" -xtype l -exec echo '{} is invalid now and going to be cleaned' \; -exec unlink {} \; 2>/dev/null &
    else
        echo "$name directory is empty or does not exist, skipping..."
    fi
}

# 使用动态确定的目标目录
ensure_dir "$APP_TARGET_DIR/"
ensure_dir "$TARGET_BASE/icons/"

# 处理 applications 目录
process_directory "/var/lib/apm/apm/files/ace-env/amber-ce-tools/data-dir/applications/" \
                  "$APP_TARGET_DIR/" "Applications"

# 处理 icons 目录
process_directory "/var/lib/apm/apm/files/ace-env/amber-ce-tools/data-dir/icons/" \
                  "$TARGET_BASE/icons/" "Icons"

# 等待所有后台任务完成
wait

# 迁移老链接（仅非麒麟系统需要）
if ! grep -q "Kylin" /etc/os-release; then
    # 定义可能的链接位置
    APM_SUBDIR="/usr/local/share/applications/apm"
    APP_ROOT_DIR="/usr/local/share/applications"
    
    # 根据当前目标目录，确定源目录
    if [ "$APP_TARGET_DIR" = "$APM_SUBDIR" ]; then
        # 当前目标是 apm 子目录，需要检查根目录是否有链接需要迁移
        SOURCE_DIR="$APP_ROOT_DIR"
    else
        # 当前目标是根目录，需要检查 apm 子目录是否有链接需要迁移
        SOURCE_DIR="$APM_SUBDIR"
    fi
    
    # 检查源目录是否存在且与目标目录不同
    if [ -d "$SOURCE_DIR" ] && [ "$SOURCE_DIR" != "$APP_TARGET_DIR" ]; then
        echo "检查并迁移老链接..."
        # 查找源目录中指向APM数据目录的符号链接
        find "$SOURCE_DIR" -maxdepth 1 -type l 2>/dev/null | while read -r link; do
            target=$(readlink "$link")
            # 如果链接指向APM的数据目录
            if [[ "$target" == /var/lib/apm/apm/files/ace-env/amber-ce-tools/data-dir/applications/* ]]; then
                filename=$(basename "$link")
                # 如果新位置没有同名文件，则移动
                if [ ! -e "$APP_TARGET_DIR/$filename" ]; then
                    echo "迁移老链接: $filename"
                    mv -v "$link" "$APP_TARGET_DIR/"
                else
                    echo "新位置已存在 $filename，删除老链接"
                    rm -v "$link"
                fi
            fi
        done
        
        # 如果源目录是 apm 子目录且已空，尝试删除
        if [ "$SOURCE_DIR" = "$APM_SUBDIR" ] && [ -d "$APM_SUBDIR" ]; then
            rmdir "$APM_SUBDIR" 2>/dev/null || true
        fi
    fi
fi