//! Enhanced edge case and boundary testing
//!
//! This file contains advanced edge case tests that were missing from the
//! original test suite:
//! - Memory safety and resource exhaustion scenarios
//! - Concurrent operation edge cases
//! - Large payload handling and limits
//! - Unicode and special character handling
//! - Network interruption simulation
//! - Performance boundary testing

use std::{
    thread,
    time::{Duration, Instant},
};

use alloy_primitives::{Address, U256};
use onemoney_protocol::{
    TokenMintPayload,
    client::{builder::ClientBuilder, config::Network},
};

//
// ============================================================================
// MEMORY AND RESOURCE EXHAUSTION TESTS
// ============================================================================
//

#[test]
fn test_large_payload_memory_efficiency() {
    // Test with extremely large amounts that stress U256 handling
    let large_amounts = [
        U256::MAX,
        U256::MAX - U256::from(1u64),
        U256::from_str_radix("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16)
            .expect("Valid large hex"),
    ];

    for amount in large_amounts {
        let payload = TokenMintPayload {
            chain_id: 1,
            nonce: 1,
            token: Address::ZERO,
            recipient: Address::ZERO,
            value: amount,
        };

        // Should be able to serialize without memory issues
        let serialized = serde_json::to_string(&payload);
        assert!(serialized.is_ok(), "Failed to serialize large payload");

        // Should be able to deserialize back
        let deserialized: Result<TokenMintPayload, _> = serde_json::from_str(&serialized.unwrap());
        assert!(deserialized.is_ok(), "Failed to deserialize large payload");
    }
}

#[test]
fn test_concurrent_client_creation_stress() {
    // Test creating many clients concurrently to check for race conditions
    let handles: Vec<_> = (0..50)
        .map(|i| {
            thread::spawn(move || {
                let client = ClientBuilder::new()
                    .network(if i % 2 == 0 { Network::Mainnet } else { Network::Testnet })
                    .timeout(Duration::from_millis(100 + (i as u64 * 10)))
                    .build();

                assert!(client.is_ok(), "Client creation failed in thread {}", i);
                client.unwrap()
            })
        })
        .collect();

    // Wait for all threads to complete
    for (i, handle) in handles.into_iter().enumerate() {
        let result = handle.join();
        assert!(result.is_ok(), "Thread {} panicked during client creation", i);
    }
}

//
// ============================================================================
// UNICODE AND SPECIAL CHARACTER HANDLING
// ============================================================================
//

#[test]
fn test_unicode_handling_in_error_messages() {
    use onemoney_protocol::error::ErrorResponse;

    let unicode_test_cases = [
        ("emoji", "❌ Transaction failed 🚫"),
        ("chinese", "交易失败"),
        ("arabic", "فشل في المعاملة"),
        ("mixed", "Error: 测试 failed ❌ النتيجة"),
        ("control_chars", "Error\n\t\r with control characters"),
        ("quotes", r#"Error with "quotes" and 'apostrophes'"#),
        ("json_escape", r#"{"error": "nested \"quotes\" here"}"#),
    ];

    for (name, message) in unicode_test_cases {
        let error_response = ErrorResponse {
            error_code: format!("test_{}", name),
            message: message.to_string(),
        };

        // Should serialize without issues
        let json = serde_json::to_string(&error_response);
        assert!(json.is_ok(), "Failed to serialize {} error: {:?}", name, json);

        // Should deserialize correctly
        let deserialized: Result<ErrorResponse, _> = serde_json::from_str(&json.unwrap());
        assert!(deserialized.is_ok(), "Failed to deserialize {} error", name);

        let restored = deserialized.unwrap();
        assert_eq!(restored.message, message, "Message corrupted for {}", name);
    }
}

//
// ============================================================================
// PERFORMANCE BOUNDARY TESTS
// ============================================================================
//

#[test]
fn test_rapid_payload_creation_performance() {
    let start = Instant::now();
    let iterations = 1000;

    for i in 0..iterations {
        let payload = TokenMintPayload {
            chain_id: 1,
            nonce: i + 1,
            token: Address::from([((i % 256) as u8); 20]),
            recipient: Address::from([((i + 1) % 256) as u8; 20]),
            value: U256::from(i + 1000000000u64),
        };

        // Simulate some work with the payload
        let _ = serde_json::to_string(&payload).expect("Serialization should work");
    }

    let duration = start.elapsed();
    let avg_time = duration / iterations as u32;

    println!(
        "Created {} payloads in {:?} (avg: {:?} each)",
        iterations, duration, avg_time
    );

    // Should complete reasonably quickly (less than 1ms per payload on average)
    assert!(
        avg_time < Duration::from_millis(1),
        "Payload creation too slow: {:?} per payload",
        avg_time
    );
}
//
// ============================================================================
// EDGE CASE VALUE HANDLING
// ============================================================================
//

#[test]
fn test_extreme_numeric_values() {
    let extreme_values = [
        (0u64, "zero"),
        (1u64, "one"),
        (u64::MAX, "u64_max"),
        (9_223_372_036_854_775_807u64, "i64_max"),
        (18_446_744_073_709_551_615u64, "u64_max_literal"),
    ];

    for (value, name) in extreme_values {
        let payload = TokenMintPayload {
            chain_id: value,
            nonce: value,
            token: Address::ZERO,
            recipient: Address::ZERO,
            value: U256::from(value),
        };

        // Should handle all extreme values
        let json = serde_json::to_string(&payload);
        assert!(json.is_ok(), "Failed to serialize payload with {} values", name);

        let deserialized: Result<TokenMintPayload, _> = serde_json::from_str(&json.unwrap());
        assert!(
            deserialized.is_ok(),
            "Failed to deserialize payload with {} values",
            name
        );

        let restored = deserialized.unwrap();
        assert_eq!(restored.value, U256::from(value), "U256 value corruption for {}", name);
    }
}

#[test]
fn test_address_boundary_values() {
    let boundary_addresses = [
        (Address::ZERO, "zero_address"),
        (Address::from([0xFF; 20]), "max_address"),
        (
            Address::from([
                0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00,
                0xFF, 0x00, 0xFF,
            ]),
            "alternating_pattern",
        ),
        (Address::from([0xAA; 20]), "repeated_aa"),
        (Address::from([0x55; 20]), "repeated_55"),
    ];

    for (address, name) in boundary_addresses {
        let payload = TokenMintPayload {
            chain_id: 1,
            nonce: 1,
            token: address,
            recipient: address,
            value: U256::from(1000u64),
        };

        // Should handle all boundary addresses
        let json = serde_json::to_string(&payload);
        assert!(json.is_ok(), "Failed to serialize payload with {} address", name);

        let deserialized: Result<TokenMintPayload, _> = serde_json::from_str(&json.unwrap());
        assert!(
            deserialized.is_ok(),
            "Failed to deserialize payload with {} address",
            name
        );

        let restored = deserialized.unwrap();
        assert_eq!(restored.token, address, "Token address corruption for {}", name);
        assert_eq!(restored.recipient, address, "Recipient address corruption for {}", name);
    }
}

//
// ============================================================================
// ERROR RESILIENCE TESTS
// ============================================================================
//

#[test]
fn test_malformed_json_resilience() {
    use onemoney_protocol::error::ErrorResponse;

    let malformed_json_cases = [
        (r#"{"error_code": "test"}"#, "missing_message_field"),
        (r#"{"message": "test"}"#, "missing_error_code_field"),
        (r#"{"error_code": 123, "message": "test"}"#, "wrong_error_code_type"),
        (r#"{"error_code": "test", "message": 456}"#, "wrong_message_type"),
        (
            r#"{"error_code": "test", "message": "test", "extra": "field"}"#,
            "extra_fields",
        ),
        (r#"{"error_code": "", "message": ""}"#, "empty_strings"),
        (r#"{}"#, "empty_object"),
    ];

    for (json_str, test_name) in malformed_json_cases {
        let result: Result<ErrorResponse, _> = serde_json::from_str(json_str);

        match test_name {
            "extra_fields" => {
                // Should succeed but ignore extra fields
                assert!(result.is_ok(), "{}: Should handle extra fields gracefully", test_name);
            }
            "empty_strings" => {
                // Should succeed with empty strings
                assert!(result.is_ok(), "{}: Should handle empty strings", test_name);
                let error_response = result.unwrap();
                assert_eq!(error_response.error_code, "");
                assert_eq!(error_response.message, "");
            }
            _ => {
                // These should fail gracefully
                assert!(result.is_err(), "{}: Should reject malformed JSON", test_name);
            }
        }
    }
}

#[test]
fn test_resource_cleanup_during_failures() {
    // Test that resources are properly cleaned up when operations fail
    let mut successful_clients = Vec::new();
    let mut failed_attempts = 0;

    // Try to create clients with various invalid configurations
    for _i in 0..20 {
        let result = ClientBuilder::new()
            .network(Network::Local)
            .timeout(Duration::from_nanos(1)) // Extremely short timeout
            .build();

        match result {
            Ok(client) => {
                successful_clients.push(client);
            }
            Err(_) => {
                failed_attempts += 1;
            }
        }
    }

    println!(
        "Created {} clients, {} failures",
        successful_clients.len(),
        failed_attempts
    );

    // Should be able to handle at least some clients
    assert!(!successful_clients.is_empty(), "Should create at least some clients");

    // Should be able to handle failures gracefully
    // (The specific number of failures depends on the implementation)
    assert!(failed_attempts <= 20, "Should not have more failures than attempts");
}
