//! Tool integration and hybrid execution mode
//!
//! Analyzes RAG responses to suggest tool executions and enriches answers with
//! tool results.

use serde_json::Value;

/// Tool suggestion from RAG answer analysis
#[derive(Debug, Clone)]
pub struct ToolSuggestion {
    pub tool_name: String,
    pub confidence: f32,
    pub args: Value,
}

/// Analyzes RAG answers to suggest relevant tools
///
/// Uses keyword matching and question pattern detection to identify tools that
/// might be useful.
pub fn analyze_for_tools(_answer: &str, question: &str) -> Vec<ToolSuggestion> {
    let mut suggestions = Vec::new();

    // System status patterns
    if question_matches_any(
        question,
        &["status", "health", "running", "check", "what's"],
    ) {
        suggestions.push(ToolSuggestion {
            tool_name: "guidance_check_system_status".to_string(),
            confidence: 0.7,
            args: serde_json::json!({}),
        });
    }

    // Configuration validation patterns
    if question_matches_any(
        question,
        &["valid", "config", "configuration", "validate", "verify"],
    ) {
        suggestions.push(ToolSuggestion {
            tool_name: "guidance_validate_config".to_string(),
            confidence: 0.6,
            args: serde_json::json!({
                "config_path": "/etc/provisioning/config.toml"
            }),
        });
    }

    // Documentation patterns
    if question_matches_any(question, &["doc", "help", "guide", "tutorial", "how to"]) {
        suggestions.push(ToolSuggestion {
            tool_name: "guidance_find_docs".to_string(),
            confidence: 0.5,
            args: serde_json::json!({
                "query": extract_main_topic(question)
            }),
        });
    }

    // Troubleshooting patterns
    if question_matches_any(
        question,
        &["error", "fail", "problem", "issue", "fix", "debug"],
    ) {
        suggestions.push(ToolSuggestion {
            tool_name: "guidance_troubleshoot".to_string(),
            confidence: 0.65,
            args: serde_json::json!({
                "error": extract_error_description(question)
            }),
        });
    }

    // Next action suggestions
    if question_matches_any(question, &["next", "then", "after", "what should"]) {
        suggestions.push(ToolSuggestion {
            tool_name: "guidance_suggest_next_action".to_string(),
            confidence: 0.55,
            args: serde_json::json!({}),
        });
    }

    // RAG tools based on keywords
    if question_matches_any(question, &["search", "find", "look for", "retrieve"]) {
        suggestions.push(ToolSuggestion {
            tool_name: "rag_semantic_search".to_string(),
            confidence: 0.6,
            args: serde_json::json!({
                "query": question.to_string(),
                "top_k": 5
            }),
        });
    }

    // Filter out low confidence suggestions and sort by confidence descending
    suggestions.sort_by(|a, b| b.confidence.partial_cmp(&a.confidence).unwrap());
    suggestions
}

/// Checks if question contains any of the keywords
fn question_matches_any(question: &str, keywords: &[&str]) -> bool {
    let lower = question.to_lowercase();
    keywords.iter().any(|kw| lower.contains(kw))
}

/// Extracts main topic from question for search
fn extract_main_topic(question: &str) -> String {
    // Simple heuristic: take the longest word or meaningful phrase
    let words: Vec<&str> = question.split_whitespace().collect();
    if words.is_empty() {
        "provisioning".to_string()
    } else {
        words
            .iter()
            .max_by_key(|w| w.len())
            .map(|w| w.to_string())
            .unwrap_or_else(|| "provisioning".to_string())
    }
}

/// Extracts error description from question
fn extract_error_description(question: &str) -> String {
    // Take the full question as error context
    question.to_string()
}

/// Enriches RAG answer with tool execution results
///
/// Appends tool execution results to the original answer.
pub fn enrich_answer_with_results(mut answer: String, tool_results: &[(String, Value)]) -> String {
    if tool_results.is_empty() {
        return answer;
    }

    answer.push_str("\n\n---\n\n**Tool Results:**\n\n");

    for (tool_name, result) in tool_results {
        answer.push_str(&format!("**{}:**\n", tool_name));

        if let Some(status) = result.get("status") {
            answer.push_str(&format!("Status: {}\n", status));
        }

        // Add tool-specific result formatting
        if let Some(msg) = result.get("message") {
            answer.push_str(&format!("{}\n", msg));
        }
        if let Some(suggestion) = result.get("suggestion") {
            answer.push_str(&format!("→ {}\n", suggestion));
        }
        if let Some(diagnosis) = result.get("diagnosis") {
            answer.push_str(&format!("{}\n", diagnosis));
        }

        answer.push('\n');
    }

    answer
}

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

    #[test]
    fn test_system_status_detection() {
        let question = "What is the current system status?";
        let suggestions = analyze_for_tools("some answer", question);
        assert!(suggestions
            .iter()
            .any(|s| s.tool_name == "guidance_check_system_status"));
    }

    #[test]
    fn test_config_validation_detection() {
        let question = "Is my configuration valid?";
        let suggestions = analyze_for_tools("some answer", question);
        assert!(suggestions
            .iter()
            .any(|s| s.tool_name == "guidance_validate_config"));
    }

    #[test]
    fn test_doc_search_detection() {
        let question = "How do I use the provisioning guide?";
        let suggestions = analyze_for_tools("some answer", question);
        assert!(suggestions
            .iter()
            .any(|s| s.tool_name == "guidance_find_docs"));
    }

    #[test]
    fn test_answer_enrichment() {
        let original = "RAG answer about provisioning".to_string();
        let results = vec![(
            "test_tool".to_string(),
            serde_json::json!({"status": "success", "message": "Tool ran"}),
        )];
        let enriched = enrich_answer_with_results(original, &results);
        assert!(enriched.contains("Tool Results"));
        assert!(enriched.contains("test_tool"));
    }
}