use std::time::Duration;

use remora_schema::{SCHEMA_GENERATION, generation, is_ready, migrate};
use sqlx::{PgPool, postgres::PgPoolOptions};

async fn test_pool() -> Option<PgPool> {
    let Some(url) = std::env::var("DATABASE_URL")
        .ok()
        .filter(|value| !value.is_empty())
    else {
        if std::env::var("REMORA_SCHEMA_REQUIRE").is_ok() {
            panic!("DATABASE_URL is required when REMORA_SCHEMA_REQUIRE is set");
        }
        return None;
    };
    Some(
        PgPoolOptions::new()
            .max_connections(12)
            .acquire_timeout(Duration::from_secs(10))
            .connect(&url)
            .await
            .expect("connect postgres"),
    )
}

#[tokio::test]
async fn migration_is_idempotent_and_marks_the_complete_generation() {
    let Some(pool) = test_pool().await else {
        return;
    };
    migrate(&pool).await.expect("first migration");
    migrate(&pool).await.expect("second migration");
    assert_eq!(
        generation(&pool).await.expect("schema generation"),
        Some(SCHEMA_GENERATION)
    );
    assert!(is_ready(&pool).await.expect("schema readiness"));

    let missing_tables: Vec<String> = sqlx::query_scalar(
        "SELECT table_name
         FROM unnest(ARRAY[
           'mutation_records', 'principal_identities', 'source_credentials', 'jobs',
           'attempts', 'result_inventories', 'deletion_operations',
           'live_event_history_state', 'worker_descriptors', 'remora_schema_state'
         ]) AS expected(table_name)
         WHERE to_regclass('public.' || table_name) IS NULL
         ORDER BY table_name",
    )
    .fetch_all(&pool)
    .await
    .expect("schema tables");
    assert!(
        missing_tables.is_empty(),
        "missing tables: {missing_tables:?}"
    );
}

#[tokio::test]
async fn concurrent_owners_converge_before_readiness() {
    let Some(pool) = test_pool().await else {
        return;
    };
    let (first, second) = tokio::join!(migrate(&pool), migrate(&pool));
    first.expect("first owner");
    second.expect("second owner");
    assert!(is_ready(&pool).await.expect("schema readiness"));
}