// tests/adresar/get_adresar_count_test.rs
use rstest::{fixture, rstest};
use server::adresar::handlers::get_adresar_count;
use common::proto::multieko2::common::Empty;
use crate::common::setup_test_db;
use sqlx::PgPool;
use tonic;

// For connection pooling
#[fixture]
async fn pool() -> PgPool {
    setup_test_db().await
}

#[fixture]
async fn closed_pool(#[future] pool: PgPool) -> PgPool {
    let pool = pool.await;
    pool.close().await;
    pool
}

// Create a self-contained test that runs in a transaction
// --------------------------------------------------------
// Instead of relying on table state and doing our own transaction management,
// we'll mock the database response to `get_adresar_count` and verify it behaves correctly

/// Test only that the handler returns the value from the database correctly
#[rstest]
#[tokio::test]
async fn test_handler_returns_count_from_database(#[future] pool: PgPool) {
    let pool = pool.await;
    
    // First, get whatever count the database currently has
    let count_query = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&pool)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Now call our handler and verify it returns the same count
    let response = get_adresar_count(&pool, Empty {}).await.unwrap();
    assert_eq!(response.count, count_query);
}

/// Test handler correctly excludes deleted records
#[rstest]
#[tokio::test]
async fn test_handler_excludes_deleted_records(#[future] pool: PgPool) {
    let pool = pool.await;
    
    // Use a transaction to isolate this test completely
    let mut tx = pool.begin().await.unwrap();
    
    // Count records where deleted = TRUE
    let deleted_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = TRUE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Count records where deleted = FALSE
    let active_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Count all records
    let total_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Verify our counts are consistent
    assert_eq!(total_count, active_count + deleted_count);
    
    // Verify our handler returns only the active count
    let response = get_adresar_count(&pool, Empty {}).await.unwrap();
    assert_eq!(response.count, active_count);
    
    // Rollback transaction
    tx.rollback().await.unwrap();
}

/// Test SQL query behavior with deleted flag
#[rstest]
#[tokio::test]
async fn test_deleted_flag_filters_records(#[future] pool: PgPool) {
    let pool = pool.await;
    
    // Use a transaction to isolate this test completely
    let mut tx = pool.begin().await.unwrap();
    
    // Insert test records inside this transaction
    // They will be automatically rolled back at the end
    
    sqlx::query!(
        "INSERT INTO adresar (firma, deleted) VALUES ($1, FALSE)",
        "Test Active Record"
    )
    .execute(&mut *tx)
    .await
    .unwrap();
    
    sqlx::query!(
        "INSERT INTO adresar (firma, deleted) VALUES ($1, TRUE)",
        "Test Deleted Record"
    )
    .execute(&mut *tx)
    .await
    .unwrap();
    
    // Count active records in the transaction
    let active_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Count deleted records in the transaction
    let deleted_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = TRUE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Verify at least one active and one deleted record
    assert!(active_count > 0);
    assert!(deleted_count > 0);
    
    // Rollback transaction
    tx.rollback().await.unwrap();
}

/// Test the handler returns an error with a closed pool
#[rstest]
#[tokio::test]
async fn test_database_error(#[future] closed_pool: PgPool) {
    let closed_pool = closed_pool.await;
    let result = get_adresar_count(&closed_pool, Empty {}).await;
    assert!(result.is_err());
    assert_eq!(result.unwrap_err().code(), tonic::Code::Internal);
}

/// Test the behavior of setting deleted to true and back
#[rstest]
#[tokio::test]
async fn test_update_of_deleted_flag(#[future] pool: PgPool) {
    let pool = pool.await;
    
    // Use a transaction for complete isolation
    let mut tx = pool.begin().await.unwrap();
    
    // Insert a test record
    let id = sqlx::query_scalar!(
        "INSERT INTO adresar (firma, deleted) VALUES ($1, FALSE) RETURNING id",
        "Test Toggle Record"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap();
    
    // Count active records with this new record
    let active_count_before = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Mark as deleted
    sqlx::query!(
        "UPDATE adresar SET deleted = TRUE WHERE id = $1",
        id
    )
    .execute(&mut *tx)
    .await
    .unwrap();
    
    // Count active records after marking as deleted
    let active_count_after_delete = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Verify count decreased by 1
    assert_eq!(active_count_after_delete, active_count_before - 1);
    
    // Mark as active again
    sqlx::query!(
        "UPDATE adresar SET deleted = FALSE WHERE id = $1",
        id
    )
    .execute(&mut *tx)
    .await
    .unwrap();
    
    // Count active records after marking as active
    let active_count_after_restore = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Verify count increased back to original
    assert_eq!(active_count_after_restore, active_count_before);
    
    // Rollback transaction
    tx.rollback().await.unwrap();
}

/// Test edge cases of an empty table
#[rstest]
#[tokio::test]
async fn test_edge_case_empty_table(#[future] pool: PgPool) {
    let pool = pool.await;
    
    // Not literally testing an empty table since we can't truncate due to FK constraints
    // But we can verify the count response is never negative
    let response = get_adresar_count(&pool, Empty {}).await.unwrap();
    assert!(response.count >= 0);
}

/// Test adding a record and verifying count increases
#[rstest]
#[tokio::test]
async fn test_count_increments_after_adding_record(#[future] pool: PgPool) {
    let pool = pool.await;
    
    // Use a transaction for complete isolation
    let mut tx = pool.begin().await.unwrap();
    
    // Get initial active count inside transaction
    let initial_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Add a record inside the transaction
    sqlx::query!(
        "INSERT INTO adresar (firma, deleted) VALUES ($1, FALSE)",
        "Test Increment Record"
    )
    .execute(&mut *tx)
    .await
    .unwrap();
    
    // Get new count inside transaction
    let new_count = sqlx::query_scalar!(
        "SELECT COUNT(*) FROM adresar WHERE deleted = FALSE"
    )
    .fetch_one(&mut *tx)
    .await
    .unwrap()
    .unwrap_or(0);
    
    // Verify count increased by exactly 1
    assert_eq!(new_count, initial_count + 1);
    
    // Rollback transaction
    tx.rollback().await.unwrap();
}