// benches/scan_ops.rs
use criterion::{criterion_group, criterion_main, Criterion, BenchmarkId};

mod common;
use common::*;

/// Benchmark SCAN operation - full database scan
fn bench_scan_full(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/scan_full");
    
    for size in [1_000, 10_000] {
        for backend_type in BackendType::all() {
            let backend = setup_populated_backend(backend_type, size, 100)
                .expect("Failed to setup backend");
            
            group.bench_with_input(
                BenchmarkId::new(format!("{}/size", backend.name()), size),
                &backend,
                |b, backend| {
                    b.iter(|| {
                        let mut cursor = 0u64;
                        let mut total = 0;
                        loop {
                            let (next_cursor, items) = backend.storage
                                .scan(cursor, None, Some(100))
                                .unwrap();
                            total += items.len();
                            if next_cursor == 0 {
                                break;
                            }
                            cursor = next_cursor;
                        }
                        total
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark SCAN operation with pattern matching
fn bench_scan_pattern(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/scan_pattern");
    
    for backend_type in BackendType::all() {
        // Create backend with mixed key patterns
        let backend = BenchmarkBackend::new(backend_type).expect("Failed to create backend");
        let mut generator = DataGenerator::new(42);
        
        // Insert keys with different patterns
        for i in 0..3_000 {
            let key = if i < 1_000 {
                format!("user:{}:profile", i)
            } else if i < 2_000 {
                format!("session:{}:data", i - 1_000)
            } else {
                format!("cache:{}:value", i - 2_000)
            };
            let value = generator.generate_value(100);
            backend.storage.set(key, value).unwrap();
        }
        
        // Benchmark pattern matching
        for pattern in ["user:*", "session:*", "cache:*"] {
            group.bench_with_input(
                BenchmarkId::new(format!("{}/pattern", backend.name()), pattern),
                &(backend.storage.clone(), pattern),
                |b, (storage, pattern)| {
                    b.iter(|| {
                        let mut cursor = 0u64;
                        let mut total = 0;
                        loop {
                            let (next_cursor, items) = storage
                                .scan(cursor, Some(pattern), Some(100))
                                .unwrap();
                            total += items.len();
                            if next_cursor == 0 {
                                break;
                            }
                            cursor = next_cursor;
                        }
                        total
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark HSCAN operation - scan hash fields
fn bench_hscan(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/hscan");
    
    for fields_count in [10, 100] {
        for backend_type in BackendType::all() {
            let backend = setup_populated_backend_hashes(backend_type, 100, fields_count, 100)
                .expect("Failed to setup backend");
            let generator = DataGenerator::new(42);
            let key = generator.generate_key("bench:hash", 0);
            
            group.bench_with_input(
                BenchmarkId::new(format!("{}/fields", backend.name()), fields_count),
                &(backend, key),
                |b, (backend, key)| {
                    b.iter(|| {
                        let mut cursor = 0u64;
                        let mut total = 0;
                        loop {
                            let (next_cursor, items) = backend.storage
                                .hscan(key, cursor, None, Some(10))
                                .unwrap();
                            total += items.len();
                            if next_cursor == 0 {
                                break;
                            }
                            cursor = next_cursor;
                        }
                        total
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark HSCAN with pattern matching
fn bench_hscan_pattern(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/hscan_pattern");
    
    for backend_type in BackendType::all() {
        let backend = BenchmarkBackend::new(backend_type).expect("Failed to create backend");
        let mut generator = DataGenerator::new(42);
        
        // Create a hash with mixed field patterns
        let key = "bench:hash:0".to_string();
        let mut fields = Vec::new();
        for i in 0..100 {
            let field = if i < 33 {
                format!("user_{}", i)
            } else if i < 66 {
                format!("session_{}", i - 33)
            } else {
                format!("cache_{}", i - 66)
            };
            let value = generator.generate_value(100);
            fields.push((field, value));
        }
        backend.storage.hset(&key, fields).unwrap();
        
        // Benchmark pattern matching
        for pattern in ["user_*", "session_*", "cache_*"] {
            group.bench_with_input(
                BenchmarkId::new(format!("{}/pattern", backend.name()), pattern),
                &(backend.storage.clone(), key.clone(), pattern),
                |b, (storage, key, pattern)| {
                    b.iter(|| {
                        let mut cursor = 0u64;
                        let mut total = 0;
                        loop {
                            let (next_cursor, items) = storage
                                .hscan(key, cursor, Some(pattern), Some(10))
                                .unwrap();
                            total += items.len();
                            if next_cursor == 0 {
                                break;
                            }
                            cursor = next_cursor;
                        }
                        total
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark KEYS operation with various patterns
fn bench_keys_operation(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/keys");
    
    for backend_type in BackendType::all() {
        // Create backend with mixed key patterns
        let backend = BenchmarkBackend::new(backend_type).expect("Failed to create backend");
        let mut generator = DataGenerator::new(42);
        
        // Insert keys with different patterns
        for i in 0..3_000 {
            let key = if i < 1_000 {
                format!("user:{}:profile", i)
            } else if i < 2_000 {
                format!("session:{}:data", i - 1_000)
            } else {
                format!("cache:{}:value", i - 2_000)
            };
            let value = generator.generate_value(100);
            backend.storage.set(key, value).unwrap();
        }
        
        // Benchmark different patterns
        for pattern in ["*", "user:*", "session:*", "*:profile", "user:*:profile"] {
            group.bench_with_input(
                BenchmarkId::new(format!("{}/pattern", backend.name()), pattern),
                &(backend.storage.clone(), pattern),
                |b, (storage, pattern)| {
                    b.iter(|| {
                        storage.keys(pattern).unwrap()
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark DBSIZE operation
fn bench_dbsize(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/dbsize");
    
    for size in [1_000, 10_000] {
        for backend_type in BackendType::all() {
            let backend = setup_populated_backend(backend_type, size, 100)
                .expect("Failed to setup backend");
            
            group.bench_with_input(
                BenchmarkId::new(format!("{}/size", backend.name()), size),
                &backend,
                |b, backend| {
                    b.iter(|| {
                        backend.storage.dbsize().unwrap()
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark LRANGE with different range sizes
fn bench_lrange_sizes(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/lrange");
    
    for range_size in [10, 50, 100] {
        for backend_type in BackendType::all() {
            let backend = setup_populated_backend_lists(backend_type, 100, 100, 100)
                .expect("Failed to setup backend");
            let generator = DataGenerator::new(42);
            let key = generator.generate_key("bench:list", 0);
            
            group.bench_with_input(
                BenchmarkId::new(format!("{}/range", backend.name()), range_size),
                &(backend, key, range_size),
                |b, (backend, key, range_size)| {
                    b.iter(|| {
                        backend.storage.lrange(key, 0, (*range_size - 1) as i64).unwrap()
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark HKEYS operation
fn bench_hkeys(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/hkeys");
    
    for fields_count in [10, 50, 100] {
        for backend_type in BackendType::all() {
            let backend = setup_populated_backend_hashes(backend_type, 100, fields_count, 100)
                .expect("Failed to setup backend");
            let generator = DataGenerator::new(42);
            let key = generator.generate_key("bench:hash", 0);
            
            group.bench_with_input(
                BenchmarkId::new(format!("{}/fields", backend.name()), fields_count),
                &(backend, key),
                |b, (backend, key)| {
                    b.iter(|| {
                        backend.storage.hkeys(key).unwrap()
                    });
                }
            );
        }
    }
    
    group.finish();
}

/// Benchmark HVALS operation
fn bench_hvals(c: &mut Criterion) {
    let mut group = c.benchmark_group("scan_ops/hvals");
    
    for fields_count in [10, 50, 100] {
        for backend_type in BackendType::all() {
            let backend = setup_populated_backend_hashes(backend_type, 100, fields_count, 100)
                .expect("Failed to setup backend");
            let generator = DataGenerator::new(42);
            let key = generator.generate_key("bench:hash", 0);
            
            group.bench_with_input(
                BenchmarkId::new(format!("{}/fields", backend.name()), fields_count),
                &(backend, key),
                |b, (backend, key)| {
                    b.iter(|| {
                        backend.storage.hvals(key).unwrap()
                    });
                }
            );
        }
    }
    
    group.finish();
}

criterion_group!(
    benches,
    bench_scan_full,
    bench_scan_pattern,
    bench_hscan,
    bench_hscan_pattern,
    bench_keys_operation,
    bench_dbsize,
    bench_lrange_sizes,
    bench_hkeys,
    bench_hvals,
);

criterion_main!(benches);