context-creator 1.5.0

//! Semantic analyzer for Rust

use crate::core::semantic::{
    analyzer::{AnalysisResult, LanguageAnalyzer, SemanticContext, SemanticResult},
    path_validator::{validate_import_path, validate_module_name},
    query_engine::QueryEngine,
    resolver::{ModuleResolver, ResolvedPath, ResolverUtils},
};
use crate::utils::error::ContextCreatorError;
use std::path::Path;
use tree_sitter::Parser;

#[allow(clippy::new_without_default)]
pub struct RustAnalyzer {
    query_engine: QueryEngine,
}

impl RustAnalyzer {
    pub fn new() -> Self {
        let language = tree_sitter_rust::language();
        let query_engine =
            QueryEngine::new(language, "rust").expect("Failed to create Rust query engine");
        Self { query_engine }
    }
}

impl LanguageAnalyzer for RustAnalyzer {
    fn language_name(&self) -> &'static str {
        "Rust"
    }

    fn analyze_file(
        &self,
        path: &Path,
        content: &str,
        context: &SemanticContext,
    ) -> SemanticResult<AnalysisResult> {
        let mut parser = Parser::new();
        parser
            .set_language(tree_sitter_rust::language())
            .map_err(|e| ContextCreatorError::ParseError(format!("Failed to set language: {e}")))?;

        let mut result = self
            .query_engine
            .analyze_with_parser(&mut parser, content)?;

        // Correlate type references with imports to populate module information
        self.correlate_types_with_imports(&mut result);

        // Resolve type definitions for the type references found
        self.query_engine.resolve_type_definitions(
            &mut result.type_references,
            path,
            &context.base_dir,
        )?;

        Ok(result)
    }

    fn can_handle_extension(&self, extension: &str) -> bool {
        extension == "rs"
    }

    fn supported_extensions(&self) -> Vec<&'static str> {
        vec!["rs"]
    }
}

impl RustAnalyzer {
    /// Correlate type references with imports to populate module information
    fn correlate_types_with_imports(&self, result: &mut AnalysisResult) {
        use std::collections::HashMap;

        // Create a mapping from imported type names to their module paths
        let mut type_to_module: HashMap<String, String> = HashMap::new();

        for import in &result.imports {
            if import.items.is_empty() {
                // Handle simple imports like "use std::collections::HashMap;"
                if let Some(type_name) = import.module.split("::").last() {
                    // Check if this looks like a type (starts with uppercase)
                    if type_name.chars().next().is_some_and(|c| c.is_uppercase()) {
                        type_to_module.insert(type_name.to_string(), import.module.clone());
                    }
                }
            } else {
                // Handle scoped imports like "use model::{Account, DatabaseFactory};"
                for item in &import.items {
                    // Check if this looks like a type (starts with uppercase)
                    if item.chars().next().is_some_and(|c| c.is_uppercase()) {
                        type_to_module.insert(item.clone(), import.module.clone());
                    }
                }
            }
        }

        // Update type references with module information
        for type_ref in &mut result.type_references {
            if type_ref.module.is_none() {
                if let Some(module_path) = type_to_module.get(&type_ref.name) {
                    type_ref.module = Some(module_path.clone());
                }
            } else if let Some(ref existing_module) = type_ref.module {
                // Check if the module path ends with the type name (e.g., "crate::domain::Session" for type "Session")
                // This happens when scoped_type_identifier captures the full path
                if existing_module.ends_with(&format!("::{}", type_ref.name)) {
                    // Remove the redundant type name from the module path
                    let corrected_module = existing_module
                        .strip_suffix(&format!("::{}", type_ref.name))
                        .unwrap_or(existing_module);
                    type_ref.module = Some(corrected_module.to_string());
                }
            }
        }
    }
}

pub struct RustModuleResolver;

impl ModuleResolver for RustModuleResolver {
    fn resolve_import(
        &self,
        module_path: &str,
        from_file: &Path,
        base_dir: &Path,
    ) -> Result<ResolvedPath, ContextCreatorError> {
        tracing::debug!(
            "RustModuleResolver::resolve_import - module: '{}', from_file: {}, base_dir: {}",
            module_path,
            from_file.display(),
            base_dir.display()
        );

        // Validate module name for security
        validate_module_name(module_path)?;

        // Handle current crate imports FIRST (e.g., my_lib::module)
        // Check if this might be the current crate by looking for Cargo.toml
        let cargo_path = base_dir.join("Cargo.toml");
        tracing::debug!(
            "Checking for Cargo.toml at: {}, exists: {}",
            cargo_path.display(),
            cargo_path.exists()
        );
        if cargo_path.exists() {
            // Try to parse crate name from Cargo.toml
            if let Ok(contents) = std::fs::read_to_string(&cargo_path) {
                // Simple parsing to find package name
                for line in contents.lines() {
                    let trimmed = line.trim();
                    if trimmed.starts_with("name") && trimmed.contains('=') {
                        // Extract the crate name from: name = "my_lib"
                        if let Some(name_part) = trimmed.split('=').nth(1) {
                            let crate_name = name_part.trim().trim_matches('"').trim_matches('\'');
                            tracing::debug!(
                                "Found crate name: '{}', checking against module path: '{}'",
                                crate_name,
                                module_path
                            );
                            if module_path.starts_with(&format!("{crate_name}::")) {
                                // This is a reference to the current crate - treat it like crate::
                                let relative_path = module_path
                                    .strip_prefix(&format!("{crate_name}::"))
                                    .unwrap();

                                // IMPORTANT: For crate-level imports, we should also include lib.rs
                                // as it's the crate root that defines the module structure
                                // For now, we'll return the most specific module file we can find

                                // For Rust, we need to find the module file, not the item within it
                                // If importing my_lib::api::handle_api_request, we want to find api.rs
                                // Split the path and try resolving progressively
                                let parts: Vec<&str> = relative_path.split("::").collect();

                                // For Rust imports, we need to resolve to the actual module file
                                // For `crate::utils::helpers::format_output`, we want to find helpers.rs
                                // But we also need to ensure parent modules (utils/mod.rs) are included

                                // Try to find the module file that contains the imported item
                                for i in (1..=parts.len()).rev() {
                                    let module_path = parts[..i].join("::");
                                    let path = ResolverUtils::module_to_path(&module_path);
                                    let full_path = base_dir.join("src").join(path);

                                    tracing::debug!(
                                        "Trying module path '{}' at: {}",
                                        module_path,
                                        full_path.display()
                                    );

                                    // Try as a direct .rs file
                                    if let Some(resolved) =
                                        ResolverUtils::find_with_extensions(&full_path, &["rs"])
                                    {
                                        tracing::debug!(
                                            "Resolved crate import to: {}",
                                            resolved.display()
                                        );
                                        let validated_path =
                                            validate_import_path(base_dir, &resolved)?;
                                        return Ok(ResolvedPath {
                                            path: validated_path,
                                            is_external: false,
                                            confidence: 0.9,
                                        });
                                    }

                                    // Try as a directory module (mod.rs)
                                    let mod_path = full_path.join("mod.rs");
                                    if mod_path.exists() {
                                        let validated_path =
                                            validate_import_path(base_dir, &mod_path)?;
                                        // For directory modules, we found the target
                                        // This is the deepest module file we can find
                                        return Ok(ResolvedPath {
                                            path: validated_path,
                                            is_external: false,
                                            confidence: 0.9,
                                        });
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        // Handle crate-relative imports
        if module_path.starts_with("crate::") {
            let relative_path = module_path.strip_prefix("crate::").unwrap();
            let path = ResolverUtils::module_to_path(relative_path);
            let full_path = base_dir.join("src").join(path);

            if let Some(resolved) = ResolverUtils::find_with_extensions(&full_path, &["rs"]) {
                let validated_path = validate_import_path(base_dir, &resolved)?;
                return Ok(ResolvedPath {
                    path: validated_path,
                    is_external: false,
                    confidence: 0.9,
                });
            }

            // Try as a directory module (mod.rs)
            let mod_path = full_path.join("mod.rs");
            if mod_path.exists() {
                let validated_path = validate_import_path(base_dir, &mod_path)?;
                return Ok(ResolvedPath {
                    path: validated_path,
                    is_external: false,
                    confidence: 0.9,
                });
            }
        }

        // Handle relative imports (self, super)
        if module_path.starts_with("self::") {
            // self:: refers to the current module
            let rest = module_path.strip_prefix("self::").unwrap();
            if let Some(parent) = from_file.parent() {
                let path = ResolverUtils::module_to_path(rest);
                let full_path = parent.join(path);
                if let Some(resolved) = ResolverUtils::find_with_extensions(&full_path, &["rs"]) {
                    let validated_path = validate_import_path(base_dir, &resolved)?;
                    return Ok(ResolvedPath {
                        path: validated_path,
                        is_external: false,
                        confidence: 0.9,
                    });
                }
            }
        } else if module_path.starts_with("super::") {
            // super:: refers to the parent module
            let rest = module_path.strip_prefix("super::").unwrap();
            if let Some(parent) = from_file.parent() {
                if let Some(grandparent) = parent.parent() {
                    // For imports like "super::parent_function", we need to find the module file
                    // that contains this function. First check if there's a lib.rs or mod.rs
                    // in the grandparent directory

                    // Try lib.rs first (common for library crates)
                    let lib_rs = grandparent.join("lib.rs");
                    if lib_rs.exists() {
                        let validated_path = validate_import_path(base_dir, &lib_rs)?;
                        return Ok(ResolvedPath {
                            path: validated_path,
                            is_external: false,
                            confidence: 0.9,
                        });
                    }

                    // Try mod.rs
                    let mod_rs = grandparent.join("mod.rs");
                    if mod_rs.exists() {
                        let validated_path = validate_import_path(base_dir, &mod_rs)?;
                        return Ok(ResolvedPath {
                            path: validated_path,
                            is_external: false,
                            confidence: 0.9,
                        });
                    }

                    // If the parent directory has a name, try parent_name.rs
                    if let Some(parent_name) = parent.file_name() {
                        let parent_rs =
                            grandparent.join(format!("{}.rs", parent_name.to_string_lossy()));
                        if parent_rs.exists() {
                            let validated_path = validate_import_path(base_dir, &parent_rs)?;
                            return Ok(ResolvedPath {
                                path: validated_path,
                                is_external: false,
                                confidence: 0.9,
                            });
                        }
                    }

                    // If rest is not empty, it might be a submodule path
                    if !rest.is_empty() {
                        let path = ResolverUtils::module_to_path(rest);
                        let full_path = grandparent.join(path);
                        if let Some(resolved) =
                            ResolverUtils::find_with_extensions(&full_path, &["rs"])
                        {
                            let validated_path = validate_import_path(base_dir, &resolved)?;
                            return Ok(ResolvedPath {
                                path: validated_path,
                                is_external: false,
                                confidence: 0.9,
                            });
                        }
                    }
                }
            }
        }

        // Handle simple module names (e.g., "mod lib;" in same directory)
        if !module_path.contains("::") {
            if let Some(parent) = from_file.parent() {
                // Try as a file
                let file_path = parent.join(format!("{module_path}.rs"));
                if file_path.exists() {
                    let validated_path = validate_import_path(base_dir, &file_path)?;
                    return Ok(ResolvedPath {
                        path: validated_path,
                        is_external: false,
                        confidence: 0.9,
                    });
                }

                // Try as a directory module
                let mod_path = parent.join(module_path).join("mod.rs");
                if mod_path.exists() {
                    let validated_path = validate_import_path(base_dir, &mod_path)?;
                    return Ok(ResolvedPath {
                        path: validated_path,
                        is_external: false,
                        confidence: 0.9,
                    });
                }
            }
        }

        // Check if it's a known external module (like stdlib)
        if self.is_external_module(module_path) {
            return Ok(ResolvedPath {
                path: base_dir.join("Cargo.toml"), // Point to Cargo.toml as indicator
                is_external: true,
                confidence: 1.0,
            });
        }

        // Otherwise, assume it's an external crate
        tracing::debug!(
            "Module '{}' not resolved locally, marking as external",
            module_path
        );
        Ok(ResolvedPath {
            path: base_dir.join("Cargo.toml"), // Point to Cargo.toml as indicator
            is_external: true,
            confidence: 0.5,
        })
    }

    fn get_file_extensions(&self) -> Vec<&'static str> {
        vec!["rs"]
    }

    fn is_external_module(&self, module_path: &str) -> bool {
        // Common standard library crates
        let stdlib_crates = ["std", "core", "alloc", "proc_macro", "test"];

        // Get the first part of the path (before ::)
        let first_part = module_path.split("::").next().unwrap_or(module_path);

        // Check if it's a standard library crate
        if stdlib_crates.contains(&first_part) {
            return true;
        }

        // Simple module names (no ::) are NOT external - they're local modules
        if !module_path.contains("::") {
            return false;
        }

        // crate::, self::, super:: are always local
        if module_path.starts_with("crate::")
            || module_path.starts_with("self::")
            || module_path.starts_with("super::")
        {
            return false;
        }

        // Other paths with :: might be external crates
        // For now, we'll consider them external unless we have more context
        true
    }
}