//! Test framework utilities for Foxhunt HFT system
#![allow(unused_crate_dependencies)]

use rust_decimal::Decimal;

/// Test framework for setting up common test infrastructure
pub struct TestFramework {
    pub config: TestConfig,
}

/// Configuration for test setup
#[derive(Debug, Clone)]
pub struct TestConfig {
    pub initial_capital: Decimal,
    pub test_symbols: Vec<String>,
    pub enable_logging: bool,
}

impl Default for TestConfig {
    fn default() -> Self {
        Self {
            initial_capital: Decimal::from(100000),
            test_symbols: vec!["BTCUSD".to_string(), "ETHUSD".to_string()],
            enable_logging: false,
        }
    }
}

impl TestFramework {
    pub fn new(config: TestConfig) -> Self {
        Self { config }
    }

    pub fn with_default() -> Self {
        Self::new(TestConfig::default())
    }

    pub async fn setup(&self) -> anyhow::Result<()> {
        if self.config.enable_logging {
            // Structured logging (tracing_subscriber) is not a dep of this
            // integration crate; tests rely on stdout println!. Callers
            // that want structured logs should run via the workspace
            // test harness which initialises tracing at its entry point.
            println!("Logging enabled (tracing_subscriber not available)");
        }
        Ok(())
    }
}

/// Test safety module for error-free testing
pub mod test_safety {
    use std::fmt::Debug;
    use std::time::Duration;

    /// Safe test result type
    pub type TestResult<T> = Result<T, TestSafetyError>;

    /// Test safety error types
    #[derive(Debug, Clone)]
    pub enum TestSafetyError {
        AssertionFailed {
            field: String,
            expected: String,
            actual: String,
        },
        ThreadJoinFailed {
            thread_type: String,
        },
        Timeout {
            operation: String,
            timeout_ms: u64,
        },
        CalculationFailed {
            operation: String,
            details: String,
        },
    }

    impl std::fmt::Display for TestSafetyError {
        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
            match self {
                TestSafetyError::AssertionFailed {
                    field,
                    expected,
                    actual,
                } => {
                    write!(
                        f,
                        "Assertion failed for {}: expected {}, got {}",
                        field, expected, actual
                    )
                },
                TestSafetyError::ThreadJoinFailed { thread_type } => {
                    write!(f, "Thread join failed for: {}", thread_type)
                },
                TestSafetyError::Timeout {
                    operation,
                    timeout_ms,
                } => {
                    write!(
                        f,
                        "Operation {} timed out after {}ms",
                        operation, timeout_ms
                    )
                },
                TestSafetyError::CalculationFailed { operation, details } => {
                    write!(f, "Calculation failed for {}: {}", operation, details)
                },
            }
        }
    }

    impl std::error::Error for TestSafetyError {}

    /// Safe assertion function
    pub fn safe_assert(
        condition: bool,
        field: &str,
        expected: &str,
        actual: impl std::fmt::Display,
    ) -> TestResult<()> {
        if condition {
            Ok(())
        } else {
            Err(TestSafetyError::AssertionFailed {
                field: field.to_string(),
                expected: expected.to_string(),
                actual: actual.to_string(),
            })
        }
    }

    /// Safe equality assertion
    pub fn safe_assert_eq<T: PartialEq + Debug>(
        actual: &T,
        expected: &T,
        field: &str,
    ) -> TestResult<()> {
        if actual == expected {
            Ok(())
        } else {
            Err(TestSafetyError::AssertionFailed {
                field: field.to_string(),
                expected: format!("{:?}", expected),
                actual: format!("{:?}", actual),
            })
        }
    }

    /// HFT Performance validator
    pub struct HftPerformanceValidator {
        pub max_latency_micros: u64,
        pub min_throughput_ops_per_sec: u64,
    }

    impl HftPerformanceValidator {
        pub fn new() -> Self {
            Self {
                max_latency_micros: 50,             // 50μs max latency
                min_throughput_ops_per_sec: 10_000, // 10k ops/sec min
            }
        }

        pub fn validate_latency(&self, duration: Duration) -> TestResult<()> {
            let micros = duration.as_micros() as u64;
            safe_assert(
                micros <= self.max_latency_micros,
                "latency",
                &format!("≤{}μs", self.max_latency_micros),
                format!("{}μs", micros),
            )
        }

        pub fn validate_throughput(&self, ops_per_sec: u64) -> TestResult<()> {
            safe_assert(
                ops_per_sec >= self.min_throughput_ops_per_sec,
                "throughput",
                &format!("≥{} ops/sec", self.min_throughput_ops_per_sec),
                format!("{} ops/sec", ops_per_sec),
            )
        }
    }

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