#!/bin/bash
# patch_fnc.sh - 企业级增量补丁包生成脚本公共函数
# 用于并行查找，提供给xargs使用


# 文件工具函数
parse_size() {
    local size_str="$1"
    local unit=$(echo "$size_str" | sed 's/[0-9.]//g' | tr 'a-z' 'A-Z')
    local value=$(echo "$size_str" | sed 's/[^0-9.]//g')
    
    case "$unit" in
        "KB") echo "$(echo "$value * 1024" | bc)" ;;
        "MB") echo "$(echo "$value * 1024 * 1024" | bc)" ;;
        "GB") echo "$(echo "$value * 1024 * 1024 * 1024" | bc)" ;;
        *) echo "$value" ;;
    esac
}

get_file_hash() {
    local file_path="$1"
    local algorithm="${2:-sha256}"
    
    case "$algorithm" in
        "md5") md5sum "$file_path" | cut -d' ' -f1 ;;
        "sha1") sha1sum "$file_path" | cut -d' ' -f1 ;;
        "sha256") sha256sum "$file_path" | cut -d' ' -f1 ;;
        *) sha256sum "$file_path" | cut -d' ' -f1 ;;
    esac
}

get_file_info() {
    local file_path="$1"
    
    if [[ ! -f "$file_path" ]]; then
        error "文件不存在: $file_path"
        return 1
    fi
    
    local stat_output
    if stat --version 2>&1 | grep -q GNU; then
        # GNU stat
        stat_output=$(stat -c "%s|%Y|%Z|%a|%u|%g" "$file_path")
    else
        # BSD stat
        stat_output=$(stat -f "%z|%m|%c|%p|%u|%g" "$file_path")
    fi
    
    echo "$stat_output"
}

# 文件筛选
should_include_file() {
    local file_path="$1"
    local file_info="$2"
    
    IFS='|' read -r size mtime ctime permissions uid gid <<< "$file_info"
    
    # 文件大小过滤
    local max_size=$(parse_size "$MAX_FILE_SIZE")
    local min_size=$(parse_size "$MIN_FILE_SIZE")
    
    if [[ $size -gt $max_size ]] || [[ $size -lt $min_size ]]; then
        warn "文件大小超出范围: $file_path ($size bytes, 限制：$min_size-$max_size bytes)"
        return 1
    fi
    
    # 包含模式匹配
    local include_match=false
    for pattern in "${INCLUDE_PATTERNS[@]}"; do
        if [[ "$file_path" == $pattern ]] || [[ "$file_path" =~ $pattern ]]; then
            include_match=true
            debug "文件匹配包含模式<$pattern>: $file_path"
            break
        fi
    done
    
    if [[ ${#INCLUDE_PATTERNS[@]} -gt 0 ]] && ! $include_match; then
        warn "文件不匹配任何包含模式: $file_path"
        return 1
    fi
    
    # 排除模式匹配
    for pattern in "${EXCLUDE_PATTERNS[@]}"; do
        if [[ "$file_path" == $pattern ]] || [[ "$file_path" =~ $pattern ]]; then
            warn "文件匹配排除模式<$pattern>: $file_path"
            return 1
        fi
    done

    # 时间过滤
    if [[ -n "$MODIFIED_AFTER" ]]; then
        local filter_time=$(date -d "$MODIFIED_AFTER" +%s 2>/dev/null || date +%s)
        if [[ $mtime -lt $filter_time ]]; then
            local mtime_str=$(date -d @$mtime +"%Y-%m-%d %H:%M:%S")
            warn "文件修改时间过早: $file_path ($mtime_str)"
            return 1
        fi
    fi    
    
    # 权限过滤
    if [[ "$PERMISSIONS_FILTER" == "true" ]]; then
        if [[ $permissions -ne 644 ]] && [[ $permissions -ne 755 ]]; then
            warn "文件权限不符合要求: $file_path ($permissions)"
            return 1
        fi
    fi
    
    # 用户过滤
    if [[ "$UID_FILTER" == "true" ]]; then
        if [[ $uid -ne 0 ]] && [[ $uid -ne 1000 ]]; then
            warn "文件所有者不符合要求: $file_path ($uid)"
            return 1
        fi
    fi
    
    # 组过滤
    if [[ "$GID_FILTER" == "true" ]]; then
        if [[ $gid -ne 0 ]] && [[ $gid -ne 1000 ]]; then
            warn "文件组不符合要求: $file_path ($gid)"
            return 1        
        fi
    fi  

    return 0
}