#![allow(
    unused_comparisons,
    clippy::absurd_extreme_comparisons,
    clippy::impossible_comparisons
)]
//! Comprehensive Unit Tests for Utils Module
//!
//! This test suite validates all utility functions including order validation,
//! risk calculations, metrics tracking, position management, and helper functions.

use trading_service::utils::*;

// ============================================================================
// Order Validation Tests
// ============================================================================

#[test]
fn test_order_validator_default() {
    let validator = validation::OrderValidator::default();

    // Default values should be reasonable
    assert!(validator.validate_order_size(100.0).is_ok());
    assert!(validator.validate_symbol("ES.FUT").is_ok());
}

#[test]
fn test_order_validator_size_valid() {
    let validator = validation::OrderValidator::new(
        1000.0, // max
        1.0,    // min
        5.0,    // price deviation
        false,  // symbol validation
        None,   // allowed symbols
    );

    // Valid sizes
    assert!(validator.validate_order_size(1.0).is_ok());
    assert!(validator.validate_order_size(500.0).is_ok());
    assert!(validator.validate_order_size(1000.0).is_ok());
}

#[test]
fn test_order_validator_size_below_minimum() {
    let validator = validation::OrderValidator::new(1000.0, 10.0, 5.0, false, None);

    let result = validator.validate_order_size(5.0);
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("below minimum"));
}

#[test]
fn test_order_validator_size_above_maximum() {
    let validator = validation::OrderValidator::new(1000.0, 1.0, 5.0, false, None);

    let result = validator.validate_order_size(2000.0);
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("exceeds maximum"));
}

#[test]
fn test_order_validator_size_negative() {
    let validator = validation::OrderValidator::default();

    let result = validator.validate_order_size(-10.0);
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("positive"));
}

#[test]
fn test_order_validator_size_zero() {
    let validator = validation::OrderValidator::default();

    let result = validator.validate_order_size(0.0);
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("positive"));
}

#[test]
fn test_order_validator_price_valid() {
    let validator = validation::OrderValidator::new(1000.0, 1.0, 5.0, false, None);

    // Price within 5% of market price
    assert!(validator.validate_price(100.0, 100.0).is_ok()); // Exact match
    assert!(validator.validate_price(104.0, 100.0).is_ok()); // +4% deviation
    assert!(validator.validate_price(96.0, 100.0).is_ok()); // -4% deviation
    assert!(validator.validate_price(105.0, 100.0).is_ok()); // +5% deviation (edge)
    assert!(validator.validate_price(95.0, 100.0).is_ok()); // -5% deviation (edge)
}

#[test]
fn test_order_validator_price_exceeds_deviation() {
    let validator = validation::OrderValidator::new(1000.0, 1.0, 5.0, false, None);

    // Price deviates >5% from market price
    let result = validator.validate_price(110.0, 100.0);
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("deviation"));
    assert!(err_msg.contains("exceeds maximum"));
}

#[test]
fn test_order_validator_price_negative() {
    let validator = validation::OrderValidator::default();

    let result = validator.validate_price(-50.0, 100.0);
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("Price must be positive"));
}

#[test]
fn test_order_validator_price_zero() {
    let validator = validation::OrderValidator::default();

    let result = validator.validate_price(0.0, 100.0);
    assert!(result.is_err());
}

#[test]
fn test_order_validator_symbol_validation_disabled() {
    let validator = validation::OrderValidator::new(1000.0, 1.0, 5.0, false, None);

    // All symbols valid when validation disabled
    assert!(validator.validate_symbol("ES.FUT").is_ok());
    assert!(validator.validate_symbol("INVALID").is_ok());
    assert!(validator.validate_symbol("ANYTHING").is_ok());
}

#[test]
fn test_order_validator_symbol_validation_enabled() {
    let allowed = vec![
        "ES.FUT".to_string(),
        "NQ.FUT".to_string(),
        "ZN.FUT".to_string(),
    ];
    let validator = validation::OrderValidator::new(1000.0, 1.0, 5.0, true, Some(allowed));

    // Valid symbols
    assert!(validator.validate_symbol("ES.FUT").is_ok());
    assert!(validator.validate_symbol("NQ.FUT").is_ok());
    assert!(validator.validate_symbol("ZN.FUT").is_ok());

    // Invalid symbols
    let result = validator.validate_symbol("INVALID");
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("not in allowed list"));
}

#[test]
fn test_order_validator_symbol_empty() {
    let validator = validation::OrderValidator::default();

    let result = validator.validate_symbol("");
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("cannot be empty"));
}

#[test]
fn test_order_validator_order_type_market_valid() {
    let validator = validation::OrderValidator::default();

    // Market orders must use IOC or FOK
    assert!(validator.validate_order_type("MARKET", "IOC").is_ok());
    assert!(validator.validate_order_type("MARKET", "FOK").is_ok());
}

#[test]
fn test_order_validator_order_type_market_invalid() {
    let validator = validation::OrderValidator::default();

    // Market orders cannot use GTC
    let result = validator.validate_order_type("MARKET", "GTC");
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("must use IOC or FOK"));
}

#[test]
fn test_order_validator_order_type_limit_valid() {
    let validator = validation::OrderValidator::default();

    // Limit orders can use any TIF
    assert!(validator.validate_order_type("LIMIT", "IOC").is_ok());
    assert!(validator.validate_order_type("LIMIT", "FOK").is_ok());
    assert!(validator.validate_order_type("LIMIT", "GTC").is_ok());
    assert!(validator.validate_order_type("LIMIT", "DAY").is_ok());
}

#[test]
fn test_order_validator_order_type_stop_valid() {
    let validator = validation::OrderValidator::default();

    assert!(validator.validate_order_type("STOP", "GTC").is_ok());
    assert!(validator.validate_order_type("STOP_LIMIT", "DAY").is_ok());
}

#[test]
fn test_order_validator_order_type_invalid() {
    let validator = validation::OrderValidator::default();

    let result = validator.validate_order_type("INVALID_TYPE", "GTC");
    assert!(result.is_err());

    let err_msg = format!("{:?}", result.unwrap_err());
    assert!(err_msg.contains("Invalid order type"));
}

// ============================================================================
// Risk Calculation Tests
// ============================================================================

#[test]
fn test_risk_calculator_default() {
    let calculator = risk::TradingRiskCalculator::default();
    let risk = calculator.calculate_position_risk(50_000.0, 200_000.0);

    assert_eq!(risk.position_value, 50_000.0);
    assert_eq!(risk.portfolio_value, 200_000.0);
    assert_eq!(risk.position_ratio, 0.25); // 25%
    assert!(!risk.is_over_limit); // 50k < 100k default limit
}

#[test]
fn test_risk_calculator_position_within_limit() {
    let calculator = risk::TradingRiskCalculator::new(100_000.0);
    let risk = calculator.calculate_position_risk(75_000.0, 300_000.0);

    assert_eq!(risk.position_value, 75_000.0);
    assert_eq!(risk.position_ratio, 0.25); // 75k/300k = 25%
    assert_eq!(risk.risk_score, 0.75); // 75k/100k = 75%
    assert!(!risk.is_over_limit);
}

#[test]
fn test_risk_calculator_position_over_limit() {
    let calculator = risk::TradingRiskCalculator::new(100_000.0);
    let risk = calculator.calculate_position_risk(150_000.0, 500_000.0);

    assert_eq!(risk.position_value, 150_000.0);
    assert_eq!(risk.position_ratio, 0.30); // 150k/500k = 30%
    assert_eq!(risk.risk_score, 1.0); // High risk (over limit)
    assert!(risk.is_over_limit);
}

#[test]
fn test_risk_calculator_zero_portfolio() {
    let calculator = risk::TradingRiskCalculator::new(100_000.0);
    let risk = calculator.calculate_position_risk(50_000.0, 0.0);

    assert_eq!(risk.position_ratio, 0.0); // Avoid division by zero
    assert_eq!(risk.risk_score, 0.5); // 50k/100k = 50%
}

// ============================================================================
// Monitoring Tests
// ============================================================================

#[test]
fn test_trading_metrics_new() {
    let metrics = monitoring::TradingMetrics::new();
    let snapshot = metrics.get_snapshot();

    assert_eq!(snapshot.order_count, 0);
    assert_eq!(snapshot.fill_count, 0);
    assert_eq!(snapshot.cancel_count, 0);
    assert_eq!(snapshot.reject_count, 0);
    assert_eq!(snapshot.fill_rate, 0.0);
}

#[test]
fn test_trading_metrics_record_order() {
    let metrics = monitoring::TradingMetrics::new();

    metrics.record_order();
    metrics.record_order();
    metrics.record_order();

    let snapshot = metrics.get_snapshot();
    assert_eq!(snapshot.order_count, 3);
}

#[test]
fn test_trading_metrics_record_fill() {
    let metrics = monitoring::TradingMetrics::new();

    metrics.record_fill();
    metrics.record_fill();

    let snapshot = metrics.get_snapshot();
    assert_eq!(snapshot.fill_count, 2);
}

#[test]
fn test_trading_metrics_fill_rate() {
    let metrics = monitoring::TradingMetrics::new();

    metrics.record_order();
    metrics.record_order();
    metrics.record_order();
    metrics.record_order(); // 4 orders
    metrics.record_fill();
    metrics.record_fill(); // 2 fills

    let snapshot = metrics.get_snapshot();
    assert_eq!(snapshot.fill_rate, 0.5); // 2/4 = 50%
}

#[test]
fn test_trading_metrics_record_cancel() {
    let metrics = monitoring::TradingMetrics::new();

    metrics.record_cancel();
    metrics.record_cancel();
    metrics.record_cancel();

    let snapshot = metrics.get_snapshot();
    assert_eq!(snapshot.cancel_count, 3);
}

#[test]
fn test_trading_metrics_record_reject() {
    let metrics = monitoring::TradingMetrics::new();

    metrics.record_reject();

    let snapshot = metrics.get_snapshot();
    assert_eq!(snapshot.reject_count, 1);
}

#[test]
fn test_trading_metrics_uptime() {
    let metrics = monitoring::TradingMetrics::new();
    std::thread::sleep(std::time::Duration::from_millis(100));

    let snapshot = metrics.get_snapshot();
    assert!(snapshot.uptime_seconds >= 0); // At least 0 seconds
}

// ============================================================================
// Portfolio Position Tests
// ============================================================================

#[test]
fn test_position_new() {
    let position = portfolio::Position::new();

    assert_eq!(position.quantity, 0.0);
    assert_eq!(position.avg_price, 0.0);
    assert_eq!(position.realized_pnl, 0.0);
}

#[test]
fn test_position_open_long() {
    let mut position = portfolio::Position::new();
    position.update(100.0, 50.0);

    assert_eq!(position.quantity, 100.0);
    assert_eq!(position.avg_price, 50.0);
    assert_eq!(position.realized_pnl, 0.0);
}

#[test]
fn test_position_add_to_long() {
    let mut position = portfolio::Position::new();
    position.update(100.0, 50.0); // 100 @ $50
    position.update(50.0, 60.0); // +50 @ $60

    assert_eq!(position.quantity, 150.0);
    // Avg price = (100*50 + 50*60) / 150 = (5000 + 3000) / 150 = 53.33
    assert!((position.avg_price - 53.333333).abs() < 0.01);
    assert_eq!(position.realized_pnl, 0.0); // No closed trades
}

#[test]
fn test_position_reduce_long() {
    let mut position = portfolio::Position::new();
    position.update(100.0, 50.0); // Open 100 @ $50
    position.update(-30.0, 55.0); // Close 30 @ $55

    assert_eq!(position.quantity, 70.0);
    assert_eq!(position.avg_price, 50.0); // Avg price unchanged
                                          // Realized PnL = 30 * (55 - 50) = $150
    assert!((position.realized_pnl - 150.0).abs() < 0.01);
}

#[test]
fn test_position_close_long() {
    let mut position = portfolio::Position::new();
    position.update(100.0, 50.0); // Open 100 @ $50
    position.update(-100.0, 60.0); // Close 100 @ $60

    assert_eq!(position.quantity, 0.0);
    assert_eq!(position.avg_price, 0.0); // Reset after close
                                         // Realized PnL = 100 * (60 - 50) = $1000
    assert!((position.realized_pnl - 1000.0).abs() < 0.01);
}

#[test]
fn test_position_open_short() {
    let mut position = portfolio::Position::new();
    position.update(-100.0, 50.0);

    assert_eq!(position.quantity, -100.0);
    assert_eq!(position.avg_price, 50.0);
    assert_eq!(position.realized_pnl, 0.0);
}

#[test]
fn test_position_reduce_short() {
    let mut position = portfolio::Position::new();
    position.update(-100.0, 50.0); // Short 100 @ $50
    position.update(30.0, 45.0); // Cover 30 @ $45

    assert_eq!(position.quantity, -70.0);
    assert_eq!(position.avg_price, 50.0);
    // Realized PnL = 30 * (50 - 45) = $150 (profit on short cover)
    assert!((position.realized_pnl - 150.0).abs() < 0.01);
}

#[test]
fn test_position_unrealized_pnl_long() {
    let mut position = portfolio::Position::new();
    position.update(100.0, 50.0);

    // Market price rises to $55
    let unrealized = position.unrealized_pnl(55.0);
    assert_eq!(unrealized, 500.0); // 100 * (55 - 50) = $500

    // Market price falls to $45
    let unrealized = position.unrealized_pnl(45.0);
    assert_eq!(unrealized, -500.0); // 100 * (45 - 50) = -$500
}

#[test]
fn test_position_unrealized_pnl_short() {
    let mut position = portfolio::Position::new();
    position.update(-100.0, 50.0);

    // Market price falls to $45 (profit for short)
    let unrealized = position.unrealized_pnl(45.0);
    assert_eq!(unrealized, 500.0); // -100 * (45 - 50) = $500

    // Market price rises to $55 (loss for short)
    let unrealized = position.unrealized_pnl(55.0);
    assert_eq!(unrealized, -500.0); // -100 * (55 - 50) = -$500
}

#[test]
fn test_position_zero_quantity_update() {
    let mut position = portfolio::Position::new();
    position.update(100.0, 50.0);

    // Update with zero quantity (no-op)
    position.update(0.0, 60.0);

    assert_eq!(position.quantity, 100.0);
    assert_eq!(position.avg_price, 50.0);
}

// ============================================================================
// Helper Function Tests
// ============================================================================

#[test]
fn test_generate_order_id() {
    let id1 = helpers::generate_order_id();
    let id2 = helpers::generate_order_id();

    // IDs should start with "ORD_"
    assert!(id1.starts_with("ORD_"));
    assert!(id2.starts_with("ORD_"));

    // IDs should be unique
    assert_ne!(id1, id2);
}

#[test]
fn test_generate_order_id_format() {
    let id = helpers::generate_order_id();

    // Format: ORD_{timestamp}_{counter}
    let parts: Vec<&str> = id.split('_').collect();
    assert_eq!(parts.len(), 3);
    assert_eq!(parts[0], "ORD");
    assert_eq!(parts[1].len(), 16); // Timestamp hex (16 chars)
    assert_eq!(parts[2].len(), 8); // Counter hex (8 chars)
}

#[test]
fn test_align_price_to_tick() {
    // Test with tick size 0.01
    assert!((helpers::align_price_to_tick(100.567, 0.01) - 100.57).abs() < 1e-10);
    assert!((helpers::align_price_to_tick(100.563, 0.01) - 100.56).abs() < 1e-10);
    assert!((helpers::align_price_to_tick(100.565, 0.01) - 100.57).abs() < 1e-10); // Round up

    // Test with tick size 0.25
    assert!((helpers::align_price_to_tick(100.30, 0.25) - 100.25).abs() < 1e-10);
    assert!((helpers::align_price_to_tick(100.40, 0.25) - 100.50).abs() < 1e-10);

    // Test with tick size 1.0
    assert!((helpers::align_price_to_tick(100.6, 1.0) - 101.0).abs() < 1e-10);
}

#[test]
fn test_align_price_to_tick_zero_tick_size() {
    // Zero tick size should return original price
    let price = 100.567;
    assert_eq!(helpers::align_price_to_tick(price, 0.0), price);
}

#[test]
fn test_calculate_order_value() {
    assert_eq!(helpers::calculate_order_value(100.0, 50.0), 5000.0);
    assert_eq!(helpers::calculate_order_value(50.0, 123.45), 6172.5);
    assert_eq!(helpers::calculate_order_value(-100.0, 50.0), 5000.0); // Abs value
}

#[test]
fn test_format_price_stock() {
    // Stock/commodity (2 decimals)
    assert_eq!(helpers::format_price(123.456789, "AAPL"), "123.46");
    assert_eq!(helpers::format_price(50.001, "ES.FUT"), "50.00");
}

#[test]
fn test_format_price_forex() {
    // Forex pair (5 decimals) - 6 chars, all alphabetic
    assert_eq!(helpers::format_price(1.234567, "EURUSD"), "1.23457");
    assert_eq!(helpers::format_price(0.987654, "GBPUSD"), "0.98765");
}

#[test]
fn test_is_market_open() {
    // This test depends on current time, so we just verify it doesn't panic
    let _is_open = helpers::is_market_open();
    // Cannot assert specific value due to time dependency
}