mcp-tools 0.1.0

//! Code Analysis MCP Server
//!
//! Provides comprehensive code analysis via MCP protocol including:
//! - Syntax tree parsing with tree-sitter
//! - Complexity analysis and metrics
//! - Code quality assessment
//! - Security vulnerability detection
//! - Dependency analysis

use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use tracing::{debug, info, warn};
use tree_sitter::{Node, Parser, Query, QueryCursor, Tree};

use crate::common::{
    BaseServer, McpContent, McpServerBase, McpTool, McpToolRequest, McpToolResponse,
    ServerCapabilities, ServerConfig,
};
use crate::{McpToolsError, Result};

/// Code Analysis MCP Server
pub struct CodeAnalysisServer {
    base: BaseServer,
}

/// Complexity analysis results
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComplexityAnalysis {
    pub cyclomatic_complexity: u32,
    pub cognitive_complexity: u32,
    pub lines_of_code: u32,
    pub functions: u32,
    pub classes: u32,
    pub nested_depth: u32,
}

/// Code quality metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QualityMetrics {
    pub maintainability_index: f64,
    pub documentation_ratio: f64,
    pub test_coverage: f64,
    pub code_duplication: f64,
    pub technical_debt: f64,
}

/// Security analysis results
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityAnalysis {
    pub vulnerabilities: Vec<SecurityVulnerability>,
    pub risk_score: u32,
    pub security_hotspots: Vec<String>,
}

/// Security vulnerability
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityVulnerability {
    pub severity: String,
    pub category: String,
    pub description: String,
    pub line: u32,
    pub recommendation: String,
}

/// Dependency analysis results
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DependencyAnalysis {
    pub imports: Vec<String>,
    pub external_dependencies: Vec<String>,
    pub internal_dependencies: Vec<String>,
    pub circular_dependencies: Vec<String>,
    pub unused_imports: Vec<String>,
}

/// Complete code analysis results
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CodeAnalysisResult {
    pub language: String,
    pub file_path: String,
    pub complexity: ComplexityAnalysis,
    pub quality: QualityMetrics,
    pub security: SecurityAnalysis,
    pub dependencies: DependencyAnalysis,
    pub suggestions: Vec<String>,
}

impl CodeAnalysisServer {
    pub async fn new(config: ServerConfig) -> Result<Self> {
        let base = BaseServer::new(config).await?;
        Ok(Self { base })
    }

    /// Detect programming language from file path and content
    fn detect_language(&self, file_path: &str, content: &str) -> String {
        // First try to detect by file extension
        if let Some(extension) = std::path::Path::new(file_path).extension() {
            match extension.to_str() {
                Some("rs") => return "rust".to_string(),
                Some("py") => return "python".to_string(),
                Some("js") => return "javascript".to_string(),
                Some("ts") => return "typescript".to_string(),
                Some("go") => return "go".to_string(),
                Some("java") => return "java".to_string(),
                Some("c") => return "c".to_string(),
                Some("cpp") | Some("cc") | Some("cxx") => return "cpp".to_string(),
                _ => {}
            }
        }

        // Fallback to content-based detection
        if content.contains("fn main()") || content.contains("use std::") {
            "rust".to_string()
        } else if content.contains("def ") || content.contains("import ") {
            "python".to_string()
        } else if content.contains("function ") || content.contains("const ") {
            "javascript".to_string()
        } else if content.contains("package main") || content.contains("func ") {
            "go".to_string()
        } else if content.contains("public class") || content.contains("import java") {
            "java".to_string()
        } else {
            "unknown".to_string()
        }
    }

    /// Analyze code complexity
    async fn analyze_complexity(
        &self,
        file_path: &str,
        content: &str,
    ) -> Result<ComplexityAnalysis> {
        let language = self.detect_language(file_path, content);

        // Create parser for the detected language
        let mut parser = Parser::new();
        let tree_sitter_language = match language.as_str() {
            "rust" => tree_sitter_rust::language(),
            "python" => tree_sitter_python::language(),
            "javascript" => tree_sitter_javascript::language(),
            "typescript" => tree_sitter_typescript::language_typescript(),
            "go" => tree_sitter_go::language(),
            "java" => tree_sitter_java::language(),
            "c" => tree_sitter_c::language(),
            "cpp" => tree_sitter_cpp::language(),
            _ => {
                // Return basic metrics for unsupported languages
                return Ok(ComplexityAnalysis {
                    cyclomatic_complexity: 1,
                    cognitive_complexity: 1,
                    lines_of_code: content.lines().count() as u32,
                    functions: 0,
                    classes: 0,
                    nested_depth: 0,
                });
            }
        };

        parser
            .set_language(tree_sitter_language)
            .map_err(|e| McpToolsError::Server(format!("Failed to set language: {}", e)))?;

        // Parse the code
        let tree = parser
            .parse(content, None)
            .ok_or_else(|| McpToolsError::Server("Failed to parse code".to_string()))?;

        // Analyze the syntax tree
        let root_node = tree.root_node();
        let mut complexity = ComplexityAnalysis {
            cyclomatic_complexity: 1, // Base complexity
            cognitive_complexity: 0,
            lines_of_code: content.lines().count() as u32,
            functions: 0,
            classes: 0,
            nested_depth: 0,
        };

        self.traverse_node(&root_node, &mut complexity, 0);

        Ok(complexity)
    }

    /// Traverse syntax tree node and calculate complexity
    fn traverse_node(&self, node: &Node, complexity: &mut ComplexityAnalysis, depth: u32) {
        complexity.nested_depth = complexity.nested_depth.max(depth);

        match node.kind() {
            // Function definitions
            "function_item"
            | "function_declaration"
            | "function_definition"
            | "method_declaration" => {
                complexity.functions += 1;
                complexity.cyclomatic_complexity += 1;
            }
            // Class definitions
            "struct_item" | "impl_item" | "class_declaration" | "class_specifier" => {
                complexity.classes += 1;
            }
            // Control flow statements that increase complexity
            "if_expression" | "if_statement" | "match_expression" | "while_statement"
            | "for_statement" | "loop_expression" | "try_statement" => {
                complexity.cyclomatic_complexity += 1;
                complexity.cognitive_complexity += 1;
            }
            // Logical operators
            "binary_expression" => {
                if let Some(operator) = node.child_by_field_name("operator") {
                    if matches!(operator.kind(), "&&" | "||" | "and" | "or") {
                        complexity.cyclomatic_complexity += 1;
                    }
                }
            }
            _ => {}
        }

        // Recursively traverse child nodes
        for i in 0..node.child_count() {
            if let Some(child) = node.child(i) {
                self.traverse_node(&child, complexity, depth + 1);
            }
        }
    }

    /// Analyze code quality metrics
    async fn analyze_quality(&self, content: &str) -> QualityMetrics {
        let lines = content.lines().collect::<Vec<_>>();
        let total_lines = lines.len() as f64;

        // Count comment lines for documentation ratio
        let comment_lines = lines
            .iter()
            .filter(|line| {
                let trimmed = line.trim();
                trimmed.starts_with("//")
                    || trimmed.starts_with("#")
                    || trimmed.starts_with("/*")
                    || trimmed.starts_with("*")
                    || trimmed.starts_with("\"\"\"")
                    || trimmed.starts_with("'''")
            })
            .count() as f64;

        let documentation_ratio = if total_lines > 0.0 {
            (comment_lines / total_lines) * 100.0
        } else {
            0.0
        };

        // Basic maintainability index calculation (simplified)
        let maintainability_index = 100.0 - (documentation_ratio * 0.1).max(0.0).min(100.0);

        QualityMetrics {
            maintainability_index,
            documentation_ratio,
            test_coverage: 0.0,    // Would need test file analysis
            code_duplication: 0.0, // Would need more sophisticated analysis
            technical_debt: 0.0,   // Would need more sophisticated analysis
        }
    }

    /// Analyze security vulnerabilities (simplified)
    async fn analyze_security(&self, content: &str, language: &str) -> SecurityAnalysis {
        let mut vulnerabilities = Vec::new();
        let lines: Vec<&str> = content.lines().collect();

        // Basic security pattern detection
        for (line_num, line) in lines.iter().enumerate() {
            let line_lower = line.to_lowercase();

            // SQL injection patterns
            if line_lower.contains("select")
                && line_lower.contains("where")
                && line_lower.contains("+")
            {
                vulnerabilities.push(SecurityVulnerability {
                    severity: "High".to_string(),
                    category: "SQL Injection".to_string(),
                    description: "Potential SQL injection vulnerability".to_string(),
                    line: (line_num + 1) as u32,
                    recommendation: "Use parameterized queries".to_string(),
                });
            }

            // Hardcoded credentials
            if line_lower.contains("password")
                && (line_lower.contains("=") || line_lower.contains(":"))
            {
                vulnerabilities.push(SecurityVulnerability {
                    severity: "Medium".to_string(),
                    category: "Hardcoded Credentials".to_string(),
                    description: "Potential hardcoded password".to_string(),
                    line: (line_num + 1) as u32,
                    recommendation: "Use environment variables or secure storage".to_string(),
                });
            }

            // Unsafe operations (language-specific)
            match language {
                "rust" => {
                    if line.contains("unsafe") {
                        vulnerabilities.push(SecurityVulnerability {
                            severity: "Medium".to_string(),
                            category: "Unsafe Code".to_string(),
                            description: "Unsafe Rust code block".to_string(),
                            line: (line_num + 1) as u32,
                            recommendation: "Review unsafe code for memory safety".to_string(),
                        });
                    }
                }
                "c" | "cpp" => {
                    if line.contains("strcpy") || line.contains("sprintf") {
                        vulnerabilities.push(SecurityVulnerability {
                            severity: "High".to_string(),
                            category: "Buffer Overflow".to_string(),
                            description: "Unsafe string function".to_string(),
                            line: (line_num + 1) as u32,
                            recommendation: "Use safe string functions like strncpy or snprintf"
                                .to_string(),
                        });
                    }
                }
                _ => {}
            }
        }

        let risk_score = vulnerabilities
            .iter()
            .map(|v| match v.severity.as_str() {
                "High" => 30,
                "Medium" => 15,
                "Low" => 5,
                _ => 0,
            })
            .sum::<u32>()
            .min(100);

        SecurityAnalysis {
            vulnerabilities,
            risk_score,
            security_hotspots: vec![], // Would need more sophisticated analysis
        }
    }

    /// Analyze dependencies (simplified)
    async fn analyze_dependencies(&self, content: &str, language: &str) -> DependencyAnalysis {
        let lines: Vec<&str> = content.lines().collect();
        let mut imports = Vec::new();
        let mut external_dependencies = Vec::new();
        let mut internal_dependencies = Vec::new();

        for line in lines {
            let trimmed = line.trim();

            match language {
                "rust" => {
                    if trimmed.starts_with("use ") {
                        let import = trimmed
                            .strip_prefix("use ")
                            .unwrap_or("")
                            .split(';')
                            .next()
                            .unwrap_or("")
                            .trim();
                        imports.push(import.to_string());

                        if import.starts_with("std::") || import.starts_with("core::") {
                            // Standard library
                        } else if import.starts_with("crate::")
                            || import.starts_with("super::")
                            || import.starts_with("self::")
                        {
                            internal_dependencies.push(import.to_string());
                        } else {
                            external_dependencies.push(import.to_string());
                        }
                    }
                }
                "python" => {
                    if trimmed.starts_with("import ") || trimmed.starts_with("from ") {
                        imports.push(trimmed.to_string());
                        // Would need more sophisticated analysis for internal vs external
                    }
                }
                "javascript" | "typescript" => {
                    if trimmed.starts_with("import ") || trimmed.contains("require(") {
                        imports.push(trimmed.to_string());
                        // Would need more sophisticated analysis for internal vs external
                    }
                }
                _ => {}
            }
        }

        DependencyAnalysis {
            imports,
            external_dependencies,
            internal_dependencies,
            circular_dependencies: Vec::new(), // Would need graph analysis
            unused_imports: Vec::new(),        // Would need usage analysis
        }
    }
}

#[async_trait]
impl McpServerBase for CodeAnalysisServer {
    async fn get_capabilities(&self) -> Result<ServerCapabilities> {
        let mut capabilities = self.base.get_capabilities().await?;

        // Add Code Analysis-specific tools
        let analysis_tools = vec![
            McpTool {
                name: "analyze_code".to_string(),
                description: "Perform comprehensive code analysis including complexity, quality, security, and dependencies".to_string(),
                input_schema: serde_json::json!({
                    "type": "object",
                    "properties": {
                        "file_path": {
                            "type": "string",
                            "description": "Path to the code file to analyze"
                        },
                        "content": {
                            "type": "string",
                            "description": "Code content to analyze (alternative to file_path)"
                        },
                        "language": {
                            "type": "string",
                            "description": "Programming language (optional, auto-detected if not provided)"
                        },
                        "analysis_type": {
                            "type": "string",
                            "description": "Type of analysis: 'complexity', 'quality', 'security', 'dependencies', or 'comprehensive'",
                            "enum": ["complexity", "quality", "security", "dependencies", "comprehensive"]
                        }
                    },
                    "required": ["file_path"],
                    "oneOf": [
                        {"required": ["file_path"]},
                        {"required": ["content"]}
                    ]
                }),
                category: "code-analysis".to_string(),
                requires_permission: false,
                permissions: vec![],
            },
            McpTool {
                name: "detect_language".to_string(),
                description: "Detect programming language from file path or content".to_string(),
                input_schema: serde_json::json!({
                    "type": "object",
                    "properties": {
                        "file_path": {
                            "type": "string",
                            "description": "Path to the file"
                        },
                        "content": {
                            "type": "string",
                            "description": "Code content to analyze"
                        }
                    },
                    "oneOf": [
                        {"required": ["file_path"]},
                        {"required": ["content"]}
                    ]
                }),
                category: "code-analysis".to_string(),
                requires_permission: false,
                permissions: vec![],
            },
            McpTool {
                name: "complexity_analysis".to_string(),
                description: "Analyze code complexity metrics including cyclomatic complexity and nesting depth".to_string(),
                input_schema: serde_json::json!({
                    "type": "object",
                    "properties": {
                        "file_path": {
                            "type": "string",
                            "description": "Path to the code file"
                        },
                        "content": {
                            "type": "string",
                            "description": "Code content to analyze"
                        },
                        "language": {
                            "type": "string",
                            "description": "Programming language (optional)"
                        }
                    },
                    "oneOf": [
                        {"required": ["file_path"]},
                        {"required": ["content"]}
                    ]
                }),
                category: "code-analysis".to_string(),
                requires_permission: false,
                permissions: vec![],
            },
            McpTool {
                name: "security_analysis".to_string(),
                description: "Analyze code for security vulnerabilities and risks".to_string(),
                input_schema: serde_json::json!({
                    "type": "object",
                    "properties": {
                        "file_path": {
                            "type": "string",
                            "description": "Path to the code file"
                        },
                        "content": {
                            "type": "string",
                            "description": "Code content to analyze"
                        },
                        "language": {
                            "type": "string",
                            "description": "Programming language (optional)"
                        }
                    },
                    "oneOf": [
                        {"required": ["file_path"]},
                        {"required": ["content"]}
                    ]
                }),
                category: "code-analysis".to_string(),
                requires_permission: false,
                permissions: vec![],
            },
        ];

        capabilities.tools = analysis_tools;
        Ok(capabilities)
    }

    async fn handle_tool_request(&self, request: McpToolRequest) -> Result<McpToolResponse> {
        info!("Handling Code Analysis tool request: {}", request.tool);

        // Get file path or content
        let file_path = request
            .arguments
            .get("file_path")
            .and_then(|v| v.as_str())
            .unwrap_or("unknown");

        let content = if let Some(content_value) = request.arguments.get("content") {
            content_value.as_str().unwrap_or("").to_string()
        } else if file_path != "unknown" {
            // In a real implementation, we would read the file
            // For now, return an error asking for content
            return Ok(McpToolResponse {
                id: request.id,
                content: vec![McpContent::text(
                    "File reading not implemented. Please provide 'content' parameter.".to_string(),
                )],
                is_error: true,
                error: Some("File reading not implemented".to_string()),
                metadata: HashMap::new(),
            });
        } else {
            return Ok(McpToolResponse {
                id: request.id,
                content: vec![McpContent::text(
                    "Either 'file_path' or 'content' parameter is required".to_string(),
                )],
                is_error: true,
                error: Some("Missing required parameter".to_string()),
                metadata: HashMap::new(),
            });
        };

        let language = request
            .arguments
            .get("language")
            .and_then(|v| v.as_str())
            .map(|s| s.to_string())
            .unwrap_or_else(|| self.detect_language(file_path, &content));

        match request.tool.as_str() {
            "analyze_code" => {
                debug!("Performing comprehensive code analysis for: {}", file_path);

                let analysis_type = request
                    .arguments
                    .get("analysis_type")
                    .and_then(|v| v.as_str())
                    .unwrap_or("comprehensive");

                match analysis_type {
                    "comprehensive" => {
                        let complexity = self.analyze_complexity(file_path, &content).await?;
                        let quality = self.analyze_quality(&content).await;
                        let security = self.analyze_security(&content, &language).await;
                        let dependencies = self.analyze_dependencies(&content, &language).await;

                        // Generate suggestions
                        let mut suggestions = Vec::new();
                        if complexity.cyclomatic_complexity > 10 {
                            suggestions
                                .push("Consider breaking down complex functions".to_string());
                        }
                        if complexity.nested_depth > 4 {
                            suggestions
                                .push("Reduce nesting depth for better readability".to_string());
                        }
                        if quality.documentation_ratio < 10.0 {
                            suggestions.push("Add more documentation and comments".to_string());
                        }

                        let result = CodeAnalysisResult {
                            language: language.clone(),
                            file_path: file_path.to_string(),
                            complexity,
                            quality,
                            security,
                            dependencies,
                            suggestions,
                        };

                        let content_text = format!(
                            "Code Analysis Complete\n\
                            Language: {}\n\
                            Cyclomatic Complexity: {}\n\
                            Lines of Code: {}\n\
                            Functions: {}\n\
                            Security Issues: {}\n\
                            Risk Score: {}/100",
                            result.language,
                            result.complexity.cyclomatic_complexity,
                            result.complexity.lines_of_code,
                            result.complexity.functions,
                            result.security.vulnerabilities.len(),
                            result.security.risk_score
                        );

                        let mut metadata = HashMap::new();
                        metadata
                            .insert("analysis_result".to_string(), serde_json::to_value(result)?);

                        Ok(McpToolResponse {
                            id: request.id,
                            content: vec![McpContent::text(content_text)],
                            is_error: false,
                            error: None,
                            metadata,
                        })
                    }
                    "complexity" => {
                        let complexity = self.analyze_complexity(file_path, &content).await?;
                        let content_text = format!(
                            "Complexity Analysis\n\
                            Cyclomatic Complexity: {}\n\
                            Cognitive Complexity: {}\n\
                            Lines of Code: {}\n\
                            Functions: {}\n\
                            Classes: {}\n\
                            Max Nesting Depth: {}",
                            complexity.cyclomatic_complexity,
                            complexity.cognitive_complexity,
                            complexity.lines_of_code,
                            complexity.functions,
                            complexity.classes,
                            complexity.nested_depth
                        );

                        let mut metadata = HashMap::new();
                        metadata
                            .insert("complexity".to_string(), serde_json::to_value(complexity)?);

                        Ok(McpToolResponse {
                            id: request.id,
                            content: vec![McpContent::text(content_text)],
                            is_error: false,
                            error: None,
                            metadata,
                        })
                    }
                    "security" => {
                        let security = self.analyze_security(&content, &language).await;
                        let content_text = format!(
                            "Security Analysis\n\
                            Vulnerabilities Found: {}\n\
                            Risk Score: {}/100\n\
                            Security Hotspots: {}",
                            security.vulnerabilities.len(),
                            security.risk_score,
                            security.security_hotspots.len()
                        );

                        let mut metadata = HashMap::new();
                        metadata.insert("security".to_string(), serde_json::to_value(security)?);

                        Ok(McpToolResponse {
                            id: request.id,
                            content: vec![McpContent::text(content_text)],
                            is_error: false,
                            error: None,
                            metadata,
                        })
                    }
                    _ => {
                        warn!("Unknown analysis type: {}", analysis_type);
                        Ok(McpToolResponse {
                            id: request.id,
                            content: vec![McpContent::text(format!(
                                "Unknown analysis type: {}",
                                analysis_type
                            ))],
                            is_error: true,
                            error: Some("Invalid analysis type".to_string()),
                            metadata: HashMap::new(),
                        })
                    }
                }
            }
            "detect_language" => {
                debug!("Detecting language for: {}", file_path);
                let detected_language = self.detect_language(file_path, &content);

                let content_text = format!("Detected Language: {}", detected_language);
                let mut metadata = HashMap::new();
                metadata.insert(
                    "language".to_string(),
                    serde_json::Value::String(detected_language),
                );

                Ok(McpToolResponse {
                    id: request.id,
                    content: vec![McpContent::text(content_text)],
                    is_error: false,
                    error: None,
                    metadata,
                })
            }
            "complexity_analysis" => {
                debug!("Analyzing complexity for: {}", file_path);
                let complexity = self.analyze_complexity(file_path, &content).await?;

                let content_text = format!(
                    "Complexity Analysis\n\
                    Cyclomatic Complexity: {}\n\
                    Lines of Code: {}\n\
                    Functions: {}",
                    complexity.cyclomatic_complexity,
                    complexity.lines_of_code,
                    complexity.functions
                );

                let mut metadata = HashMap::new();
                metadata.insert("complexity".to_string(), serde_json::to_value(complexity)?);

                Ok(McpToolResponse {
                    id: request.id,
                    content: vec![McpContent::text(content_text)],
                    is_error: false,
                    error: None,
                    metadata,
                })
            }
            "security_analysis" => {
                debug!("Analyzing security for: {}", file_path);
                let security = self.analyze_security(&content, &language).await;

                let content_text = format!(
                    "Security Analysis\n\
                    Vulnerabilities: {}\n\
                    Risk Score: {}/100",
                    security.vulnerabilities.len(),
                    security.risk_score
                );

                let mut metadata = HashMap::new();
                metadata.insert("security".to_string(), serde_json::to_value(security)?);

                Ok(McpToolResponse {
                    id: request.id,
                    content: vec![McpContent::text(content_text)],
                    is_error: false,
                    error: None,
                    metadata,
                })
            }
            _ => {
                warn!("Unknown Code Analysis tool: {}", request.tool);
                Err(McpToolsError::Server(format!(
                    "Unknown Code Analysis tool: {}",
                    request.tool
                )))
            }
        }
    }

    async fn get_stats(&self) -> Result<crate::common::ServerStats> {
        self.base.get_stats().await
    }

    async fn initialize(&mut self) -> Result<()> {
        info!("Initializing Code Analysis MCP Server");
        Ok(())
    }

    async fn shutdown(&mut self) -> Result<()> {
        info!("Shutting down Code Analysis MCP Server");
        Ok(())
    }
}