snm-brightdata-client 0.4.0

// src/filters/response_filter.rs - ENHANCED with DEDUCT_DATA environment variable only
use regex::Regex;
use std::sync::OnceLock;

static FINANCIAL_REGEX: OnceLock<Regex> = OnceLock::new();
static NUMBER_REGEX: OnceLock<Regex> = OnceLock::new();
static ESSENTIAL_REGEX: OnceLock<Regex> = OnceLock::new();
// Enhanced stock-specific patterns
static STOCK_PRICE_REGEX: OnceLock<Regex> = OnceLock::new();
static MARKET_CAP_REGEX: OnceLock<Regex> = OnceLock::new();
static STOCK_SYMBOL_REGEX: OnceLock<Regex> = OnceLock::new();

pub struct ResponseFilter;

impl ResponseFilter {
    /// ENHANCED: Check if data reduction is enabled via DEDUCT_DATA environment variable only
    pub fn is_data_reduction_enabled() -> bool {
        std::env::var("DEDUCT_DATA")
            .unwrap_or_else(|_| "false".to_string())
            .to_lowercase() == "true"
    }

    /// ENHANCED: Check if truncate filtering is enabled (same as data reduction)
    pub fn is_truncate_filter_enabled() -> bool {
        Self::is_data_reduction_enabled()
    }

    /// ENHANCED: Stock-specific financial content filtering with DEDUCT_DATA control
    pub fn filter_financial_content(content: &str) -> String {
        // SAFETY: Early empty check
        if content.is_empty() {
            return "No data".to_string();
        }

        // Check DEDUCT_DATA environment variable - return full content if disabled
        if !Self::is_data_reduction_enabled() {
            return content.to_string(); // Return full content if reduction disabled
        }

        // TODO: Add data reduction logic here when DEDUCT_DATA=true
        // For now, return full content
        content.to_string()
    }
    
    /// TODO: Extract financial lines with comprehensive safety
    fn safe_extract_financial_lines(content: &str) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }

        // TODO: Add financial line extraction logic
        // For now, return original content
        content.to_string()
    }
    
    /// TODO: Extract stock-specific data with comprehensive error handling
    fn extract_stock_specific_data(content: &str) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }

        // TODO: Add stock-specific data extraction logic
        // For now, return original content
        content.to_string()
    }
    
    /// TODO: Enhanced essential metrics extraction
    fn extract_only_essential_metrics(content: &str) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }

        // TODO: Add essential metrics extraction logic
        // For now, return original content
        content.to_string()
    }
    
    /// TODO: Extract any financial numbers with comprehensive safety
    fn safe_extract_any_numbers(content: &str) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }

        // TODO: Add number extraction logic
        // For now, return original content
        content.to_string()
    }
    
    /// ENHANCED: Check if financial data is present with null safety
    pub fn contains_financial_data(content: &str) -> bool {
        if content.is_empty() {
            return false;
        }
        
        // TODO: Add financial data detection logic
        // For now, return true if content is not empty
        true
    }
    
    /// ENHANCED: Check if content contains valid stock data
    pub fn contains_valid_stock_data(content: &str) -> bool {
        if content.is_empty() {
            return false;
        }
        
        // TODO: Add stock data validation logic
        // For now, return true if content is not empty
        true
    }
    
    /// ENHANCED: Error page check
    pub fn is_error_page(content: &str) -> bool {
        if content.is_empty() {
            return true; // Empty content is effectively an error
        }
        
        // TODO: Add error page detection logic
        // For now, return false unless content is empty
        false
    }
    
    /// ENHANCED: Navigation check
    pub fn is_mostly_navigation(content: &str) -> bool {
        if content.is_empty() {
            return false;
        }
        
        // TODO: Add navigation detection logic
        // For now, return false
        false
    }
    
    /// ENHANCED: Smart financial data extraction with DEDUCT_DATA control
    pub fn extract_high_value_financial_data(content: &str, max_tokens: usize) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }
        
        // Check DEDUCT_DATA - return full content if disabled
        if !Self::is_data_reduction_enabled() {
            return content.to_string();
        }

        // TODO: Add high-value financial data extraction logic when DEDUCT_DATA=true
        // For now, return original content
        content.to_string()
    }
    
    /// TODO: Extract priority patterns with full safety
    fn safe_extract_priority_patterns(content: &str, max_chars: usize) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }

        // TODO: Add priority pattern extraction logic
        // For now, return original content
        content.to_string()
    }

    /// ENHANCED: Extract stock symbol with comprehensive safety
    pub fn extract_stock_symbol(content: &str) -> Option<String> {
        if content.is_empty() {
            return None;
        }
        
        // TODO: Add stock symbol extraction logic
        // For now, return None
        None
    }
    
    /// ENHANCED: Quality score with overflow protection
    pub fn get_content_quality_score(content: &str) -> u8 {
        if content.is_empty() {
            return 0;
        }

        // TODO: Add content quality scoring logic
        // For now, return maximum score for non-empty content
        100
    }
    
    /// ENHANCED: Truncation with DEDUCT_DATA control
    pub fn truncate_content(content: &str, max_chars: usize) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }
        
        // Check DEDUCT_DATA - return full content if disabled
        if !Self::is_data_reduction_enabled() {
            return content.to_string();
        }

        // TODO: Add content truncation logic when DEDUCT_DATA=true
        // For now, return original content
        content.to_string()
    }
    
    /// TODO: Fallback truncation method
    fn safe_truncate_fallback(content: &str, max_chars: usize) -> String {
        // TODO: Add safe truncation logic
        // For now, return original content
        content.to_string()
    }
    
    /// ENHANCED: Token efficiency check with safety
    pub fn is_token_efficient(content: &str) -> bool {
        if content.is_empty() {
            return false;
        }
        
        // TODO: Add token efficiency check logic
        // For now, return true for non-empty content
        true
    }
    
    /// ENHANCED: Token estimation with overflow protection
    pub fn estimate_tokens(text: &str) -> usize {
        if text.is_empty() {
            return 0;
        }

        // TODO: Add token estimation logic
        // For now, use simple character count / 4
        text.len() / 4
    }

    /// ENHANCED: Smart truncation preserving financial data with DEDUCT_DATA control
    pub fn smart_truncate_preserving_financial_data(content: &str, max_chars: usize) -> String {
        if content.is_empty() {
            return "No data".to_string();
        }
        
        // Check DEDUCT_DATA - return full content if disabled
        if !Self::is_data_reduction_enabled() {
            return content.to_string();
        }

        // TODO: Add smart truncation logic when DEDUCT_DATA=true
        // For now, return original content
        content.to_string()
    }
    
    /// TODO: Extract financial lines with truncation
    fn safe_extract_financial_lines_truncated(content: &str, max_chars: usize) -> String {
        // TODO: Add financial line extraction with truncation logic
        // For now, return original content
        content.to_string()
    }
}