tailwind-rs-postcss 0.15.4

//! CSS analyzer for identifying optimization opportunities

use super::types::*;
use regex::Regex;
use std::collections::HashMap;

/// CSS analyzer for identifying optimization opportunities
pub struct CSSAnalyzer {
    rule_analyzer: RuleAnalyzer,
    property_analyzer: PropertyAnalyzer,
    selector_analyzer: SelectorAnalyzer,
}

impl CSSAnalyzer {
    /// Create new CSS analyzer
    pub fn new() -> Self {
        Self {
            rule_analyzer: RuleAnalyzer::new(),
            property_analyzer: PropertyAnalyzer::new(),
            selector_analyzer: SelectorAnalyzer::new(),
        }
    }

    /// Analyze CSS for optimization opportunities
    pub fn analyze(&self, css: &str) -> Result<AnalysisReport, OptimizationError> {
        let start_time = std::time::Instant::now();

        // Analyze rules
        let rule_analysis = self.rule_analyzer.analyze_rules(css)?;

        // Analyze properties
        let property_analysis = self.property_analyzer.analyze_properties(css)?;

        // Analyze selectors
        let selector_analysis = self.selector_analyzer.analyze_selectors(css)?;

        let analysis_time = start_time.elapsed();

        Ok(AnalysisReport {
            rules: rule_analysis,
            properties: property_analysis,
            selectors: selector_analysis,
            analysis_time,
        })
    }
}

/// Rule analyzer for CSS rules
pub struct RuleAnalyzer;

impl RuleAnalyzer {
    pub fn new() -> Self {
        Self
    }

    pub fn analyze_rules(&self, css: &str) -> Result<RuleAnalysis, OptimizationError> {
        let total_rules = css.matches('{').count();
        let empty_rules = self.find_empty_rules(css)?;
        let duplicate_rules = self.find_duplicate_rules(css)?;
        let mergeable_rules = self.find_mergeable_rules(css)?;

        Ok(RuleAnalysis {
            total_rules,
            empty_rules,
            duplicate_rules,
            mergeable_rules,
        })
    }

    fn find_empty_rules(&self, css: &str) -> Result<Vec<String>, OptimizationError> {
        let mut empty = Vec::new();
        let rule_pattern = Regex::new(r"([^{]+)\s*\{\s*\}").unwrap();

        for cap in rule_pattern.captures_iter(css) {
            empty.push(cap[1].trim().to_string());
        }

        Ok(empty)
    }

    fn find_duplicate_rules(&self, css: &str) -> Result<Vec<DuplicateRule>, OptimizationError> {
        let mut duplicates = Vec::new();
        let mut selector_count: HashMap<String, usize> = HashMap::new();
        let rule_pattern = Regex::new(r"([^{]+)\s*\{").unwrap();

        for cap in rule_pattern.captures_iter(css) {
            let selector = cap[1].trim().to_string();
            *selector_count.entry(selector).or_insert(0) += 1;
        }

        for (selector, count) in selector_count {
            if count > 1 {
                duplicates.push(DuplicateRule { selector, count });
            }
        }

        Ok(duplicates)
    }

    fn find_mergeable_rules(&self, _css: &str) -> Result<Vec<MergeableRule>, OptimizationError> {
        // Simplified implementation - would need more sophisticated analysis
        Ok(Vec::new())
    }
}

/// Property analyzer for CSS properties
pub struct PropertyAnalyzer;

impl PropertyAnalyzer {
    pub fn new() -> Self {
        Self
    }

    pub fn analyze_properties(&self, css: &str) -> Result<PropertyAnalysis, OptimizationError> {
        let total_properties = css.matches(':').count();
        let duplicate_properties = self.find_duplicate_properties(css)?;
        let redundant_properties = self.find_redundant_properties(css)?;
        let optimizable_properties = self.find_optimizable_properties(css)?;

        Ok(PropertyAnalysis {
            total_properties,
            duplicate_properties,
            redundant_properties,
            optimizable_properties,
        })
    }

    fn find_duplicate_properties(
        &self,
        _css: &str,
    ) -> Result<Vec<DuplicateProperty>, OptimizationError> {
        // Simplified implementation
        Ok(Vec::new())
    }

    fn find_redundant_properties(
        &self,
        _css: &str,
    ) -> Result<Vec<RedundantProperty>, OptimizationError> {
        // Simplified implementation
        Ok(Vec::new())
    }

    fn find_optimizable_properties(
        &self,
        _css: &str,
    ) -> Result<Vec<OptimizableProperty>, OptimizationError> {
        // Simplified implementation
        Ok(Vec::new())
    }
}

/// Selector analyzer for CSS selectors
pub struct SelectorAnalyzer;

impl SelectorAnalyzer {
    pub fn new() -> Self {
        Self
    }

    pub fn analyze_selectors(&self, css: &str) -> Result<SelectorAnalysis, OptimizationError> {
        let total_selectors = css.matches('{').count();
        let redundant_selectors = self.find_redundant_selectors(css)?;
        let optimizable_selectors = self.find_optimizable_selectors(css)?;
        let complex_selectors = self.find_complex_selectors(css)?;

        Ok(SelectorAnalysis {
            total_selectors,
            redundant_selectors,
            optimizable_selectors,
            complex_selectors,
        })
    }

    fn find_redundant_selectors(&self, _css: &str) -> Result<Vec<String>, OptimizationError> {
        // Simplified implementation
        Ok(Vec::new())
    }

    fn find_optimizable_selectors(
        &self,
        _css: &str,
    ) -> Result<Vec<OptimizableSelector>, OptimizationError> {
        // Simplified implementation
        Ok(Vec::new())
    }

    fn find_complex_selectors(
        &self,
        _css: &str,
    ) -> Result<Vec<ComplexSelector>, OptimizationError> {
        // Simplified implementation
        Ok(Vec::new())
    }
}