agentis-ctx 0.3.4

//! Analysis-related MCP tools.

use rmcp::model::{CallToolResult, Content, ErrorCode, Tool};
use serde_json::Value;

use super::{parse_params, schema_for, CallGraphParams, SmartContextParams};
use crate::mcp::server::CtxServer;

/// Helper to create an internal error.
fn internal_error(msg: impl Into<String>) -> rmcp::ErrorData {
    rmcp::ErrorData::new(ErrorCode::INTERNAL_ERROR, msg.into(), None)
}

/// Create the get_callers tool definition.
pub fn get_callers_tool() -> Tool {
    Tool::new(
        "get_callers",
        "Find all functions that call a given function. \
         Useful for understanding the impact of changes and the call hierarchy.",
        schema_for::<CallGraphParams>(),
    )
}

/// Create the get_callees tool definition.
pub fn get_callees_tool() -> Tool {
    Tool::new(
        "get_callees",
        "Find all functions called by a given function. \
         Useful for understanding dependencies and what a function relies on.",
        schema_for::<CallGraphParams>(),
    )
}

/// Create the smart_context tool definition.
pub fn smart_context_tool() -> Tool {
    Tool::new(
        "smart_context",
        "Intelligently select relevant files for a given task using semantic search \
         and call graph analysis. Returns the most relevant code for implementing \
         a feature, fixing a bug, or understanding a concept.",
        schema_for::<SmartContextParams>(),
    )
}

/// Execute the get_callers tool.
pub async fn get_callers(
    server: &CtxServer,
    args: Option<&serde_json::Map<String, Value>>,
) -> Result<CallToolResult, rmcp::ErrorData> {
    let params: CallGraphParams = parse_params(args)?;

    // Find the function first
    let symbols = server
        .with_db(|db| {
            db.find_symbols_filtered(
                &params.function,
                100,
                params.file.as_deref(),
                Some("function"),
            )
        })
        .map_err(|e| internal_error(e.to_string()))?;

    if symbols.is_empty() {
        return Ok(CallToolResult::success(vec![Content::text(format!(
            "Function '{}' not found",
            params.function
        ))]));
    }

    let sym = &symbols[0];
    let sym_name = sym.name.clone();

    // Get incoming edges (callers)
    let edges = server
        .with_db(|db| db.get_incoming_edges(&sym_name))
        .map_err(|e| internal_error(e.to_string()))?;

    if edges.is_empty() {
        return Ok(CallToolResult::success(vec![Content::text(format!(
            "No callers found for '{}'",
            sym.name
        ))]));
    }

    let mut output = format!("Functions that call '{}' ({}):\n\n", sym.name, edges.len());

    for edge in &edges {
        let source_id = edge.source_id.clone();
        if let Ok(Some(caller)) = server.with_db(|db| db.get_symbol(&source_id)) {
            output.push_str(&format!(
                "- {} ({}:{})\n",
                caller.name,
                caller.file_path,
                edge.line.unwrap_or(caller.line_start)
            ));
            if let Some(ref ctx) = edge.context {
                output.push_str(&format!("  Call: {}\n", ctx));
            }
        }
    }

    Ok(CallToolResult::success(vec![Content::text(output)]))
}

/// Execute the get_callees tool.
pub async fn get_callees(
    server: &CtxServer,
    args: Option<&serde_json::Map<String, Value>>,
) -> Result<CallToolResult, rmcp::ErrorData> {
    let params: CallGraphParams = parse_params(args)?;

    // Find the function first
    let symbols = server
        .with_db(|db| {
            db.find_symbols_filtered(
                &params.function,
                100,
                params.file.as_deref(),
                Some("function"),
            )
        })
        .map_err(|e| internal_error(e.to_string()))?;

    if symbols.is_empty() {
        return Ok(CallToolResult::success(vec![Content::text(format!(
            "Function '{}' not found",
            params.function
        ))]));
    }

    let sym = &symbols[0];
    let sym_id = sym.id.clone();

    // Get outgoing edges (callees)
    let edges = server
        .with_db(|db| db.get_outgoing_edges(&sym_id))
        .map_err(|e| internal_error(e.to_string()))?;

    if edges.is_empty() {
        return Ok(CallToolResult::success(vec![Content::text(format!(
            "No function calls found in '{}'",
            sym.name
        ))]));
    }

    let mut output = format!("Functions called by '{}' ({}):\n\n", sym.name, edges.len());

    for edge in &edges {
        output.push_str(&format!(
            "- {} [{}] (line {})\n",
            edge.target_name,
            edge.kind.as_str(),
            edge.line.unwrap_or(0)
        ));
    }

    Ok(CallToolResult::success(vec![Content::text(output)]))
}

/// Execute the smart_context tool.
pub async fn smart_context(
    server: &CtxServer,
    args: Option<&serde_json::Map<String, Value>>,
) -> Result<CallToolResult, rmcp::ErrorData> {
    use crate::embeddings::local::LocalProvider;
    use crate::embeddings::ollama::OllamaProvider;
    use crate::embeddings::openai::OpenAIProvider;
    use crate::embeddings::{Embedding, EmbeddingProvider, Provider};
    use crate::smart::{smart_context_with_embedding, SmartConfig};
    use crate::tokens::Encoding;

    let params: SmartContextParams = parse_params(args)?;

    // Check if embeddings exist
    let embedding_count = server
        .with_db(|db| db.count_embeddings())
        .map_err(|e| internal_error(e.to_string()))?;

    if embedding_count == 0 {
        return Err(internal_error(
            "No embeddings found. Run 'ctx embed' first to generate embeddings.",
        ));
    }

    // Check if analytics is available
    let has_analytics = server.with_analytics(|_| ()).is_some();
    if !has_analytics {
        return Err(internal_error(
            "Analytics not available. Run 'ctx index' first.",
        ));
    }

    // Configure smart context
    let config = SmartConfig {
        max_tokens: params.max_tokens.unwrap_or(8000),
        depth: params.depth.unwrap_or(2),
        top: params.top.unwrap_or(10),
        encoding: Encoding::default(),
    };

    // Resolve provider: explicit `provider` string wins, else the deprecated
    // `use_openai` bool, else the `.ctx/config.toml` default, else local. Network
    // providers embed asynchronously so they don't block the async runtime.
    // (Named `project_config` so it doesn't shadow the `SmartConfig` above.)
    let project_config =
        crate::config::CtxConfig::load(&std::env::current_dir().unwrap_or_default());
    let provider = match params.provider.as_deref() {
        Some("openai") => Provider::Openai,
        Some("ollama") => Provider::Ollama,
        Some("local") => Provider::Local,
        None => Provider::resolve(
            None,
            params.use_openai.unwrap_or(false),
            project_config.embedding.provider,
        ),
        Some(other) => {
            return Err(internal_error(format!(
                "Unknown provider '{}'. Expected: local, openai, or ollama.",
                other
            )))
        }
    };

    let task_embedding: Embedding = match provider {
        Provider::Openai => {
            let provider = OpenAIProvider::from_env().map_err(|e| {
                internal_error(format!(
                    "Failed to initialize OpenAI provider: {}. Set OPENAI_API_KEY environment variable.",
                    e
                ))
            })?;
            provider
                .embed_async(&params.task)
                .await
                .map_err(|e| internal_error(format!("Failed to generate embedding: {}", e)))?
        }
        Provider::Ollama => {
            let provider = OllamaProvider::from_config_async(
                project_config.embedding.model.as_deref(),
                project_config.embedding.host.as_deref(),
            )
            .await
            .map_err(|e| internal_error(format!("Failed to initialize Ollama provider: {}", e)))?;
            provider
                .embed_async(&params.task)
                .await
                .map_err(|e| internal_error(format!("Failed to generate embedding: {}", e)))?
        }
        Provider::Local => {
            // Local fastembed is CPU-bound; sync embed is fine.
            let provider = LocalProvider::new().map_err(|e| {
                internal_error(format!("Failed to initialize embedding model: {}", e))
            })?;
            provider
                .embed(&params.task)
                .map_err(|e| internal_error(format!("Failed to generate embedding: {}", e)))?
        }
    };

    // Run smart context selection with pre-computed embedding
    let result = {
        let db = server.db.lock().unwrap();
        let analytics = server
            .analytics
            .as_ref()
            .ok_or_else(|| internal_error("Analytics not available"))?
            .lock()
            .unwrap();

        smart_context_with_embedding(&db, &analytics, &params.task, &task_embedding, config)
    }
    .map_err(|e| internal_error(format!("Smart context selection failed: {}", e)))?;

    if result.selected_files.is_empty() {
        return Ok(CallToolResult::success(vec![Content::text(format!(
            "No relevant files found for task: \"{}\"",
            params.task
        ))]));
    }

    // Format output
    let mut output = format!("Smart context for: \"{}\"\n\n", params.task);
    output.push_str(&format!(
        "Selected {} files ({} tokens){}:\n\n",
        result.selected_files.len(),
        result.total_tokens,
        if result.truncated {
            format!(", {} omitted due to token limit", result.omitted_count)
        } else {
            String::new()
        }
    ));

    for file in &result.selected_files {
        output.push_str(&format!(
            "- {} (relevance: {:.0}%, {} tokens)\n",
            file.path,
            file.relevance_score * 100.0,
            file.token_count
        ));
        for reason in &file.reasons {
            output.push_str(&format!("  - {:?}\n", reason));
        }
    }

    // Include the actual file contents if they fit
    output.push_str("\n---\n\nSelected file contents:\n\n");

    let root = server.root();
    for file in &result.selected_files {
        let path = root.join(&file.path);
        if let Ok(content) = std::fs::read_to_string(&path) {
            output.push_str(&format!("// === {} ===\n\n", file.path));
            output.push_str(&content);
            output.push_str("\n\n");
        }
    }

    Ok(CallToolResult::success(vec![Content::text(output)]))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_get_callers_tool_definition() {
        let tool = get_callers_tool();
        assert_eq!(tool.name.as_ref(), "get_callers");
        assert!(tool.description.is_some());
    }

    #[test]
    fn test_get_callees_tool_definition() {
        let tool = get_callees_tool();
        assert_eq!(tool.name.as_ref(), "get_callees");
        assert!(tool.description.is_some());
    }

    #[test]
    fn test_smart_context_tool_definition() {
        let tool = smart_context_tool();
        assert_eq!(tool.name.as_ref(), "smart_context");
        assert!(tool.description.is_some());
    }
}