mod common;

use serial_test::serial;
use uuid::Uuid;
use vmall_api::error::ApiError;
use vmall_api::modules::cart;
use vmall_api::modules::identity::service::{self as identity, RegisterInput};
use vmall_api::modules::order::{self, AddressBody};
use vmall_api::state::AppState;

fn address() -> AddressBody {
    AddressBody {
        recipient: "Test".into(),
        phone: "123".into(),
        country: "US".into(),
        region: "CA".into(),
        city: "SJ".into(),
        line1: "1 Way".into(),
        postal_code: "95131".into(),
    }
}

async fn register_user(state: &AppState, label: &str) -> Uuid {
    let email = format!("{label}-{}@test.local", Uuid::new_v4());
    let (user, _) = identity::register(
        state,
        RegisterInput {
            email,
            password: "password123".into(),
            display_name: label.into(),
        },
    )
    .await
    .unwrap();
    user.id
}

async fn sellable_sku(state: &AppState, slug: &str, price_minor: i64, stock: i32) -> Uuid {
    let slug = format!("{slug}-{}", &Uuid::new_v4().simple().to_string()[..8]);
    let shop_id: Uuid = sqlx::query_scalar(
        "INSERT INTO shops (name, slug) VALUES ($1, $2) RETURNING id",
    )
    .bind(serde_json::json!({"en": slug, "zh": slug}))
    .bind(&slug)
    .fetch_one(&state.db)
    .await
    .unwrap();
    let product_id: Uuid = sqlx::query_scalar(
        "INSERT INTO products (shop_id, slug, name, status)
         VALUES ($1, $2, $3, 'published') RETURNING id",
    )
    .bind(shop_id)
    .bind(&slug)
    .bind(serde_json::json!({"en": slug, "zh": slug}))
    .fetch_one(&state.db)
    .await
    .unwrap();
    sqlx::query_scalar(
        "INSERT INTO skus (product_id, sku_code, price_minor, currency, stock, active)
         VALUES ($1, $2, $3, 'USD', $4, TRUE) RETURNING id",
    )
    .bind(product_id)
    .bind(format!("{slug}-sku"))
    .bind(price_minor)
    .bind(stock)
    .fetch_one(&state.db)
    .await
    .unwrap()
}

#[tokio::test]
#[serial]
async fn checkout_rejects_empty_cart() {
    let state = common::spawn_state().await;
    let user_id = register_user(&state, "empty-cart").await;
    let err = order::checkout(&state, user_id, address(), "USD".into(), Default::default(), None)
        .await
        .unwrap_err();
    assert!(matches!(err, ApiError::BadRequest(m) if m.contains("empty")));
}

#[tokio::test]
#[serial]
async fn decrement_stock_rejects_when_guard_fails() {
    let state = common::spawn_state().await;
    let sku_id = sellable_sku(&state, "guard", 100, 1).await;
    let mut tx = state.db.begin().await.unwrap();
    let err = order::repo::decrement_stock(&mut tx, sku_id, 2)
        .await
        .unwrap_err();
    tx.rollback().await.unwrap();
    assert!(matches!(err, ApiError::Conflict(m) if m.contains("insufficient stock")));
    let left: i32 = sqlx::query_scalar("SELECT stock FROM skus WHERE id = $1")
        .bind(sku_id)
        .fetch_one(&state.db)
        .await
        .unwrap();
    assert_eq!(left, 1);
}

#[tokio::test]
#[serial]
async fn checkout_rejects_insufficient_stock() {
    let state = common::spawn_state().await;
    let user_id = register_user(&state, "low-stock").await;
    let sku_id = sellable_sku(&state, "low", 1000, 1).await;
    cart::service::add_item(&state, user_id, sku_id, 2)
        .await
        .unwrap();
    let err = order::checkout(&state, user_id, address(), "USD".into(), Default::default(), None)
        .await
        .unwrap_err();
    assert!(matches!(err, ApiError::Conflict(m) if m.contains("insufficient stock")));
}

#[tokio::test]
#[serial]
async fn checkout_splits_per_shop() {
    let state = common::spawn_state().await;
    let user_id = register_user(&state, "split").await;
    let sku_a = sellable_sku(&state, "sa", 1000, 5).await;
    let sku_b = sellable_sku(&state, "sb", 2000, 5).await;
    cart::service::add_item(&state, user_id, sku_a, 2)
        .await
        .unwrap();
    cart::service::add_item(&state, user_id, sku_b, 1)
        .await
        .unwrap();
    let orders = order::checkout(&state, user_id, address(), "USD".into(), Default::default(), None)
        .await
        .unwrap();
    assert_eq!(orders.len(), 2);
    let totals: Vec<i64> = orders.iter().map(|o| o.order.total_minor).collect();
    assert!(totals.contains(&2000) && totals.contains(&2000));
}

#[tokio::test]
#[serial]
async fn pay_and_cancel_require_pending_payment() {
    let state = common::spawn_state().await;
    let user_id = register_user(&state, "status").await;
    let sku_id = sellable_sku(&state, "st", 500, 3).await;
    cart::service::add_item(&state, user_id, sku_id, 1)
        .await
        .unwrap();
    let orders = order::checkout(&state, user_id, address(), "USD".into(), Default::default(), None)
        .await
        .unwrap();
    let id = orders[0].order.id;
    order::service::pay(&state, user_id, id).await.unwrap();
    let err = order::service::pay(&state, user_id, id).await.unwrap_err();
    assert!(matches!(err, ApiError::Conflict(_)));
    let err = order::service::cancel(&state, user_id, id)
        .await
        .unwrap_err();
    assert!(matches!(err, ApiError::Conflict(_)));
}