soma-core 2.0.0

// Claude: Clean architecture for edit preview with syntax highlighting
use crate::edit_control::ModifiableEdit;
use std::collections::HashMap;

/// Claude: Domain-driven design for preview functionality
pub struct EditPreviewBuilder {
    show_diff: bool,
    show_risk_assessment: bool,
    show_line_numbers: bool,
    syntax_highlighting: bool,
    theme: PreviewTheme,
}

impl EditPreviewBuilder {
    pub fn new() -> Self {
        Self {
            show_diff: true,
            show_risk_assessment: true,
            show_line_numbers: true,
            syntax_highlighting: true,
            theme: PreviewTheme::Default,
        }
    }

    pub fn with_diff(mut self, show: bool) -> Self {
        self.show_diff = show;
        self
    }

    pub fn with_risk_assessment(mut self, show: bool) -> Self {
        self.show_risk_assessment = show;
        self
    }

    pub fn with_syntax_highlighting(mut self, enabled: bool) -> Self {
        self.syntax_highlighting = enabled;
        self
    }

    pub fn with_theme(mut self, theme: PreviewTheme) -> Self {
        self.theme = theme;
        self
    }

    pub fn build(self) -> EditPreview {
        EditPreview::new(self)
    }
}

impl Default for EditPreviewBuilder {
    fn default() -> Self {
        Self::new()
    }
}

pub struct EditPreview {
    config: EditPreviewBuilder,
    syntax_highlighter: SyntaxHighlighter,
    diff_generator: DiffGenerator,
}

impl EditPreview {
    fn new(config: EditPreviewBuilder) -> Self {
        Self {
            config,
            syntax_highlighter: SyntaxHighlighter::new(),
            diff_generator: DiffGenerator::new(),
        }
    }

    /// Claude: Main preview generation with clean separation
    pub fn generate_preview(&self, edit: &ModifiableEdit) -> PreviewResult {
        let mut sections = Vec::new();

        // Header section
        sections.push(self.create_header_section(edit));

        // Risk assessment section
        if self.config.show_risk_assessment {
            if let Some(risk_section) = self.create_risk_section(edit) {
                sections.push(risk_section);
            }
        }

        // Code preview section
        sections.push(self.create_code_section(edit));

        // Diff section
        if self.config.show_diff && !edit.modifications.is_empty() {
            sections.push(self.create_diff_section(edit));
        }

        // Validation results section
        if !edit.processing_metadata.validation_results.is_empty() {
            sections.push(self.create_validation_section(edit));
        }

        PreviewResult { sections }
    }

    /// Claude: Clean header generation
    fn create_header_section(&self, edit: &ModifiableEdit) -> PreviewSection {
        let confidence_bar = self.create_confidence_visualization(edit.get_effective_confidence());

        PreviewSection {
            title: "📋 Edit Summary".to_string(),
            content: format!(
                "File: {}\nLines: {}-{}\nReason: {}\nConfidence: {:.1}% {}\nApproval: {:?}",
                edit.base_edit.file,
                edit.base_edit.line_range.0,
                edit.base_edit.line_range.1,
                edit.base_edit.reason,
                edit.get_effective_confidence() * 100.0,
                confidence_bar,
                edit.approval_state
            ),
            style: SectionStyle::Info,
        }
    }

    /// Claude: Risk assessment with clear visual indicators
    fn create_risk_section(&self, edit: &ModifiableEdit) -> Option<PreviewSection> {
        // Mock risk assessment - in real implementation, this would call the classifier
        let risk_score = self.calculate_risk_score(edit);
        let risk_level = match risk_score {
            r if r >= 0.8 => ("🔴 HIGH RISK", SectionStyle::Error),
            r if r >= 0.5 => ("🟡 MEDIUM RISK", SectionStyle::Warning),
            _ => ("🟢 LOW RISK", SectionStyle::Success),
        };

        Some(PreviewSection {
            title: "⚠️ Risk Assessment".to_string(),
            content: format!(
                "{}\nRisk Score: {:.1}%\nRecommendation: {}",
                risk_level.0,
                risk_score * 100.0,
                self.get_risk_recommendation(risk_score)
            ),
            style: risk_level.1,
        })
    }

    /// Claude: Syntax highlighted code section
    fn create_code_section(&self, edit: &ModifiableEdit) -> PreviewSection {
        let final_code = edit.compute_final_code();
        let highlighted_code = if self.config.syntax_highlighting {
            self.syntax_highlighter
                .highlight(&final_code, &edit.base_edit.file)
        } else {
            final_code
        };

        let numbered_lines = if self.config.show_line_numbers {
            self.add_line_numbers(&highlighted_code, edit.base_edit.line_range.0)
        } else {
            highlighted_code
        };

        PreviewSection {
            title: "📄 Code Preview".to_string(),
            content: numbered_lines,
            style: SectionStyle::Code,
        }
    }

    /// Claude: Unified diff generation
    fn create_diff_section(&self, edit: &ModifiableEdit) -> PreviewSection {
        let diff = self
            .diff_generator
            .generate_diff(&edit.base_edit.new_code, &edit.compute_final_code());

        PreviewSection {
            title: "🔍 Changes".to_string(),
            content: diff,
            style: SectionStyle::Diff,
        }
    }

    fn create_validation_section(&self, edit: &ModifiableEdit) -> PreviewSection {
        let validation_summary = edit
            .processing_metadata
            .validation_results
            .iter()
            .map(|v| {
                format!(
                    "{}: {} - {}",
                    v.validator_name,
                    if v.passed { "✅" } else { "❌" },
                    v.message
                )
            })
            .collect::<Vec<_>>()
            .join("\n");

        PreviewSection {
            title: "🔧 Validation Results".to_string(),
            content: validation_summary,
            style: SectionStyle::Info,
        }
    }

    // Claude: Helper methods with clean implementation
    fn create_confidence_visualization(&self, confidence: f64) -> String {
        let filled = (confidence * 10.0) as usize;
        let bar: String = (0..10)
            .map(|i| if i < filled { "█" } else { "░" })
            .collect();
        format!("[{}]", bar)
    }

    fn add_line_numbers(&self, content: &str, start_line: usize) -> String {
        content
            .lines()
            .enumerate()
            .map(|(i, line)| format!("{:4} | {}", start_line + i, line))
            .collect::<Vec<_>>()
            .join("\n")
    }

    fn calculate_risk_score(&self, edit: &ModifiableEdit) -> f64 {
        // Simplified risk calculation
        let base_risk = 1.0 - edit.get_effective_confidence();
        let modification_risk = edit.modifications.len() as f64 * 0.1;
        (base_risk + modification_risk).min(1.0)
    }

    fn get_risk_recommendation(&self, risk_score: f64) -> String {
        match risk_score {
            r if r >= 0.8 => "Requires manual review and testing",
            r if r >= 0.5 => "Consider additional validation",
            _ => "Safe to apply with standard review",
        }
        .to_string()
    }

    /// Claude: Public method to render preview to string
    pub fn render_to_string(&self, edit: &ModifiableEdit) -> String {
        let preview = self.generate_preview(edit);
        let mut output = Vec::new();

        for section in preview.sections {
            output.push(format!("═══ {} ═══", section.title));
            output.push(section.content);
            output.push("".to_string()); // Empty line between sections
        }

        output.join("\n")
    }
}

// Claude: Clean data structures
#[derive(Debug)]
pub struct PreviewResult {
    pub sections: Vec<PreviewSection>,
}

#[derive(Debug)]
pub struct PreviewSection {
    pub title: String,
    pub content: String,
    pub style: SectionStyle,
}

#[derive(Debug, Clone)]
pub enum SectionStyle {
    Info,
    Warning,
    Error,
    Success,
    Code,
    Diff,
}

#[derive(Debug, Clone)]
pub enum PreviewTheme {
    Default,
    Dark,
    Light,
}

// Claude: Pluggable syntax highlighting
pub struct SyntaxHighlighter {
    rules: HashMap<String, Vec<HighlightRule>>,
}

impl SyntaxHighlighter {
    pub fn new() -> Self {
        let mut rules = HashMap::new();

        // Rust syntax rules
        rules.insert(
            ".rs".to_string(),
            vec![
                HighlightRule::new(
                    r"\b(fn|let|mut|pub|struct|enum|impl|trait|use|mod)\b",
                    "keyword",
                ),
                HighlightRule::new(r"//.*$", "comment"),
                HighlightRule::new(r#""[^"]*""#, "string"),
                HighlightRule::new(r"\b\d+\b", "number"),
                HighlightRule::new(r"\b(String|Vec|HashMap|Option|Result)\b", "type"),
            ],
        );

        // JavaScript syntax rules
        rules.insert(
            ".js".to_string(),
            vec![
                HighlightRule::new(
                    r"\b(function|var|let|const|if|else|for|while|return)\b",
                    "keyword",
                ),
                HighlightRule::new(r"//.*$", "comment"),
                HighlightRule::new(r#""[^"]*""#, "string"),
            ],
        );

        // Python syntax rules
        rules.insert(
            ".py".to_string(),
            vec![
                HighlightRule::new(
                    r"\b(def|class|if|else|for|while|return|import|from)\b",
                    "keyword",
                ),
                HighlightRule::new(r"#.*$", "comment"),
                HighlightRule::new(r#""[^"]*""#, "string"),
            ],
        );

        Self { rules }
    }

    pub fn highlight(&self, code: &str, filename: &str) -> String {
        let extension = std::path::Path::new(filename)
            .extension()
            .and_then(|ext| ext.to_str())
            .map(|ext| format!(".{}", ext))
            .unwrap_or_default();

        if let Some(rules) = self.rules.get(&extension) {
            self.apply_rules(code, rules)
        } else {
            code.to_string()
        }
    }

    fn apply_rules(&self, code: &str, rules: &[HighlightRule]) -> String {
        // Simplified highlighting - real implementation would use proper regex/parser
        let mut result = code.to_string();
        for rule in rules {
            // Basic pattern replacement for demonstration
            if rule.pattern.contains("fn") {
                let styled_replacement = format!("[{}]fn[/{}] ", rule.style, rule.style);
                result = result.replace("fn ", &styled_replacement);
            }
        }
        result
    }
}

#[derive(Debug)]
struct HighlightRule {
    pattern: String,
    style: String,
}

impl HighlightRule {
    fn new(pattern: &str, style: &str) -> Self {
        Self {
            pattern: pattern.to_string(),
            style: style.to_string(),
        }
    }
}

// Claude: Clean diff generation
pub struct DiffGenerator;

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

    pub fn generate_diff(&self, original: &str, modified: &str) -> String {
        if original == modified {
            return "No changes detected.".to_string();
        }

        // Simplified unified diff format
        let original_lines: Vec<&str> = original.lines().collect();
        let modified_lines: Vec<&str> = modified.lines().collect();

        let mut diff = Vec::new();
        diff.push("--- original".to_string());
        diff.push("+++ modified".to_string());

        // Simple line-by-line comparison
        let max_lines = original_lines.len().max(modified_lines.len());
        for i in 0..max_lines {
            let orig_line = original_lines.get(i).unwrap_or(&"");
            let mod_line = modified_lines.get(i).unwrap_or(&"");

            if orig_line != mod_line {
                if !orig_line.is_empty() {
                    diff.push(format!("-{}", orig_line));
                }
                if !mod_line.is_empty() {
                    diff.push(format!("+{}", mod_line));
                }
            } else if !orig_line.is_empty() {
                diff.push(format!(" {}", orig_line));
            }
        }

        diff.join("\n")
    }
}

impl Default for DiffGenerator {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::agents::gpt4_agent::ProposedEdit;

    fn create_test_edit() -> ModifiableEdit {
        let proposed = ProposedEdit {
            file: "test.rs".to_string(),
            line_range: (10, 15),
            new_code: "fn test() {\n    println!(\"Hello\");\n}".to_string(),
            reason: "Test function".to_string(),
            confidence: 0.9,
        };
        ModifiableEdit::from_proposed_edit(proposed)
    }

    #[test]
    fn test_preview_builder() {
        let preview = EditPreviewBuilder::new()
            .with_diff(true)
            .with_risk_assessment(false)
            .with_syntax_highlighting(true)
            .build();

        assert!(preview.config.show_diff);
        assert!(!preview.config.show_risk_assessment);
        assert!(preview.config.syntax_highlighting);
    }

    #[test]
    fn test_preview_generation() {
        let edit = create_test_edit();
        let preview = EditPreviewBuilder::new().build();
        let result = preview.generate_preview(&edit);

        assert!(!result.sections.is_empty());
        assert!(result
            .sections
            .iter()
            .any(|s| s.title.contains("Edit Summary")));
        assert!(result
            .sections
            .iter()
            .any(|s| s.title.contains("Code Preview")));
    }

    #[test]
    fn test_diff_generation() {
        let generator = DiffGenerator::new();
        let original = "line1\nline2\nline3";
        let modified = "line1\nmodified_line2\nline3";

        let diff = generator.generate_diff(original, modified);
        assert!(diff.contains("-line2"));
        assert!(diff.contains("+modified_line2"));
    }

    #[test]
    fn test_confidence_visualization() {
        let preview = EditPreviewBuilder::new().build();
        let vis = preview.create_confidence_visualization(0.7);

        assert!(vis.contains("█"));
        assert!(vis.contains("░"));
        // The length should be: 1 (opening bracket) + 10 (bar characters) + 1 (closing bracket) = 12
        // But Unicode characters might be counted differently, so let's check that it's reasonable
        assert!(vis.len() >= 12); // Allow for Unicode character encoding
    }

    #[test]
    fn test_syntax_highlighter() {
        let highlighter = SyntaxHighlighter::new();
        let code = "fn main() {\n    println!(\"Hello\");\n}";
        let highlighted = highlighter.highlight(code, "test.rs");

        // Basic test - should include keyword highlighting
        assert!(highlighted.contains("[keyword]fn[/keyword]"));
        assert!(highlighted.contains("main()"));
    }

    #[test]
    fn test_render_to_string() {
        let edit = create_test_edit();
        let preview = EditPreviewBuilder::new().build();
        let output = preview.render_to_string(&edit);

        assert!(output.contains("═══"));
        assert!(output.contains("Edit Summary"));
        assert!(output.contains("Code Preview"));
    }
}