//! Inspect DBN Metadata
//!
//! Reads DBN file metadata to understand price encoding and schema details.

use anyhow::Result;
use dbn::decode::{DbnDecoder, DbnMetadata};

#[tokio::main]
async fn main() -> Result<()> {
    println!("DBN Metadata Inspector");
    println!("======================\n");

    let file_path = "test_data/real/databento/ES.FUT_ohlcv-1m_2024-01-02.dbn";

    // Create decoder
    let decoder = DbnDecoder::from_file(file_path)?;

    // Get metadata (DecodeDbn trait method)
    let metadata = decoder.metadata();

    println!("📋 Metadata:");
    println!("  Version:      {:?}", metadata.version);
    println!("  Dataset:      {}", metadata.dataset);
    println!("  Schema:       {:?}", metadata.schema);
    println!("  Start:        {}", metadata.start);
    println!("  End:          {:?}", metadata.end);
    println!("  Limit:        {:?}", metadata.limit);
    println!("  Stype In:     {:?}", metadata.stype_in);
    println!("  Stype Out:    {:?}", metadata.stype_out);
    println!();

    println!("🔧 Symbol Mappings:");
    for (i, symbol_map) in metadata.symbol_map().iter().enumerate() {
        println!("  [{}] {:?}", i, symbol_map);
    }

    // Check schema for price_exp field
    println!("💡 Schema Information:");
    println!("  Schema: {:?}", metadata.schema);
    println!("\n  Note: price_exp field may indicate decimal places for price conversion");
    println!("        Common values:");
    println!("        - price_exp = -9: divide by 1,000,000,000 (9 decimals)");
    println!("        - price_exp = -7: divide by 10,000,000 (7 decimals)");
    println!("        - price_exp = -2: divide by 100 (2 decimals, e.g., cents)");

    Ok(())
}