//! DBN Data Visualization Example
//!
//! Creates ASCII chart visualization of ES.FUT price data.

use anyhow::Result;
use backtesting_service::dbn_repository::DbnMarketDataRepository;
use backtesting_service::repositories::MarketDataRepository;
use chrono::Timelike;
use rust_decimal::prelude::ToPrimitive;
use rust_decimal::Decimal;
use std::collections::HashMap;

#[tokio::main]
async fn main() -> Result<()> {
    // Load data
    let mut file_mapping = HashMap::new();
    file_mapping.insert(
        "ES.FUT".to_string(),
        "test_data/real/databento/ES.FUT_ohlcv-1m_2024-01-02.dbn".to_string(),
    );

    let repo = DbnMarketDataRepository::new(file_mapping).await?;

    let symbols = vec!["ES.FUT".to_string()];
    let start_time = 1704153600_000_000_000i64; // 2024-01-02 00:00:00 UTC
    let end_time = 1704240000_000_000_000i64; // 2024-01-03 00:00:00 UTC

    let data = repo
        .load_historical_data(&symbols, start_time, end_time)
        .await?;

    if data.is_empty() {
        println!("❌ ERROR: No data loaded!");
        return Ok(());
    }

    println!("ES.FUT Price Chart (ASCII)");
    println!("==========================\n");
    println!("Date: 2024-01-02 (E-mini S&P 500 Futures)");
    println!(
        "Total bars: {} (sampling every {}th bar for visualization)\n",
        data.len(),
        if data.len() > 400 { 10 } else { 5 }
    );

    // Sample data for visualization
    let step_size = if data.len() > 400 { 10 } else { 5 };
    let sample_data: Vec<_> = data.iter().step_by(step_size).take(50).collect();

    // Normalize prices to 0-25 range for ASCII chart
    let min_price = sample_data
        .iter()
        .map(|b| b.low)
        .min()
        .unwrap_or(Decimal::ZERO);
    let max_price = sample_data
        .iter()
        .map(|b| b.high)
        .max()
        .unwrap_or(Decimal::ZERO);
    let price_range = max_price - min_price;
    let price_range_f64 = price_range.to_f64().unwrap_or(1.0);

    println!("  Price Range: ${:.2} - ${:.2}\n", min_price, max_price);

    // Print chart header
    println!(
        "  Time      Price    Chart (Low to High)                    Volume"
    );
    println!("  --------  -------  -----------------------------------------  -------");

    for bar in sample_data {
        let low_f64 = bar.low.to_f64().unwrap_or(0.0);
        let high_f64 = bar.high.to_f64().unwrap_or(0.0);
        let close_f64 = bar.close.to_f64().unwrap_or(0.0);
        let min_price_f64 = min_price.to_f64().unwrap_or(0.0);

        let norm_low = (((low_f64 - min_price_f64) / price_range_f64 * 40.0) as usize).min(39);
        let norm_high = (((high_f64 - min_price_f64) / price_range_f64 * 40.0) as usize).min(39);
        let norm_close = (((close_f64 - min_price_f64) / price_range_f64 * 40.0) as usize).min(39);

        let mut line = String::from("|");
        for i in 0..40 {
            if i >= norm_low && i <= norm_high {
                if i == norm_close {
                    line.push('●'); // Close price
                } else if i == norm_low || i == norm_high {
                    line.push('┼'); // High/Low markers
                } else {
                    line.push('│'); // Range bar
                }
            } else {
                line.push(' ');
            }
        }
        line.push('|');

        println!(
            "  {:02}:{:02}:{:02}  ${:>7.2}  {} {:>7.0}",
            bar.timestamp.hour(),
            bar.timestamp.minute(),
            bar.timestamp.second(),
            bar.close,
            line,
            bar.volume
        );
    }

    println!("\n  Legend:");
    println!("    ● = Close price");
    println!("    │ = High-Low range");
    println!("    ┼ = High/Low markers");

    // Print some key statistics
    println!("\n📊 Key Statistics:");
    let total_volume: Decimal = data.iter().map(|b| b.volume).sum();
    let sum_prices: Decimal = data.iter().map(|b| b.close).sum();
    let avg_price = sum_prices / Decimal::from(data.len());

    println!("  Average Price: ${:.2}", avg_price);
    println!("  Total Volume:  {:.0}", total_volume);
    println!("  Price Range:   ${:.2}", price_range);

    Ok(())
}