//! Benchmarks for connection pool performance and lifecycle
//!
//! Note: These benchmarks simulate connection pool operations.
//! Real database benchmarks will be added in Phase 1 when database code exists.

use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
use std::time::Duration;

/// Benchmark pool configuration overhead
fn bench_pool_config(c: &mut Criterion) {
    c.bench_function("pool_config_creation", |b| {
        b.iter(|| {
            // Simulate pool configuration setup
            let config = black_box(vec![
                ("max_size", "10"),
                ("min_idle", "2"),
                ("timeout", "30s"),
            ]);
            let _config: std::collections::HashMap<_, _> = config.into_iter().collect();
        });
    });
}

/// Benchmark connection URL parsing
fn bench_connection_parsing(c: &mut Criterion) {
    c.bench_function("connection_url_parsing", |b| {
        b.iter(|| {
            let url = black_box("postgresql://user:pass@localhost:5432/db");
            let _parts: Vec<&str> = url.split("://").collect();
        });
    });
}

/// Benchmark connection pool state management
fn bench_pool_state_management(c: &mut Criterion) {
    let mut group = c.benchmark_group("pool_state_management");

    for pool_size in [10, 50, 100].iter() {
        group.bench_with_input(
            BenchmarkId::from_parameter(pool_size),
            pool_size,
            |b, &pool_size| {
                b.iter(|| {
                    // Simulate pool state tracking
                    let mut active_connections = black_box(0);
                    for _ in 0..pool_size {
                        active_connections += 1;
                        if active_connections > pool_size / 2 {
                            active_connections -= 1; // Simulate connection release
                        }
                    }
                    let _final_count = active_connections;
                });
            },
        );
    }
    group.finish();
}

/// Benchmark connection retry logic
fn bench_connection_retry(c: &mut Criterion) {
    c.bench_function("connection_retry_logic", |b| {
        b.iter(|| {
            let mut attempts = black_box(0);
            let max_retries = 3;

            while attempts < max_retries {
                attempts += 1;
                if attempts == max_retries {
                    break; // Simulate successful connection
                }
            }
            let _total_attempts = attempts;
        });
    });
}

criterion_group! {
    name = benches;
    config = Criterion::default()
        .measurement_time(Duration::from_secs(10))
        .sample_size(100);
    targets =
        bench_pool_config,
        bench_connection_parsing,
        bench_pool_state_management,
        bench_connection_retry
}

criterion_main!(benches);
