//! Table formatting for MongoDB document collections
//!
//! This module provides table-style formatting for displaying multiple documents:
//! - ASCII table layout with borders and separators
//! - Automatic column width calculation
//! - Field name extraction from multiple documents
//! - Support for truncating long values

use mongodb::bson::Document;

use crate::error::Result;
use crate::executor::ResultData;

/// Table formatter for document collections
pub struct TableFormatter {
    /// Maximum column width
    max_column_width: usize,

    /// Show borders
    show_borders: bool,

    /// Column separator
    separator: String,
}

impl TableFormatter {
    /// Create a new table formatter
    ///
    /// # Returns
    /// * `Self` - New table formatter
    pub fn new() -> Self {
        Self {
            max_column_width: 50,
            show_borders: true,
            separator: " | ".to_string(),
        }
    }

    /// Format result data as table
    ///
    /// # Arguments
    /// * `data` - Result data to format
    ///
    /// # Returns
    /// * `Result<String>` - Table string or error
    pub fn format(&self, data: &ResultData) -> Result<String> {
        match data {
            ResultData::Documents(docs) => self.format_documents(docs),
            ResultData::Document(doc) => self.format_documents(&vec![doc.clone()]),
            ResultData::Message(msg) => Ok(msg.clone()),
            _ => Ok(format!("{:?}", data)),
        }
    }

    /// Format multiple documents as table
    ///
    /// # Arguments
    /// * `docs` - Documents to format
    ///
    /// # Returns
    /// * `Result<String>` - Table string
    fn format_documents(&self, docs: &[Document]) -> Result<String> {
        todo!("Format documents as ASCII table with columns for each field")
    }

    /// Extract all unique field names from documents
    ///
    /// # Arguments
    /// * `docs` - Documents to analyze
    ///
    /// # Returns
    /// * `Vec<String>` - Unique field names
    fn get_field_names(&self, docs: &[Document]) -> Vec<String> {
        todo!("Extract all unique field names across all documents")
    }

    /// Format table header
    ///
    /// # Arguments
    /// * `fields` - Field names
    ///
    /// # Returns
    /// * `String` - Header row
    fn format_header(&self, fields: &[String]) -> String {
        todo!("Format table header with field names")
    }

    /// Format table row
    ///
    /// # Arguments
    /// * `doc` - Document to format
    /// * `fields` - Field names in order
    ///
    /// # Returns
    /// * `String` - Table row
    fn format_row(&self, doc: &Document, fields: &[String]) -> String {
        todo!("Format single document as table row")
    }
}

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