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//LICENSE Portions Copyright 2019-2021 ZomboDB, LLC.
//LICENSE
//LICENSE Portions Copyright 2021-2023 Technology Concepts & Design, Inc.
//LICENSE
//LICENSE Portions Copyright 2023-2023 PgCentral Foundation, Inc. <contact@pgcentral.org>
//LICENSE
//LICENSE All rights reserved.
//LICENSE
//LICENSE Use of this source code is governed by the MIT license that can be found in the LICENSE file.
/*!

Rust to SQL mapping support for dependency graph generation

> Like all of the [`sql_entity_graph`][crate::pgrx_sql_entity_graph] APIs, this is considered **internal**
to the `pgrx` framework and very subject to change between versions. While you may use this, please do it with caution.

*/
use core::any::TypeId;

/// A mapping from a Rust type to a SQL type, with a `TypeId`.
///
/// ```rust
/// use pgrx_sql_entity_graph::RustSqlMapping;
///
/// let constructed = RustSqlMapping::of::<i32>(String::from("int"));
/// let raw = RustSqlMapping {
///     rust: core::any::type_name::<i32>().to_string(),
///     sql: String::from("int"),
///     id: core::any::TypeId::of::<i32>(),
/// };
///
/// assert_eq!(constructed, raw);
/// ```
#[derive(Debug, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct RustSqlMapping {
    // This is the **resolved** type, not the raw source. This means a Type Alias of `type Foo = u32` would appear as `u32`.
    pub rust: String,
    pub sql: String,
    pub id: TypeId,
}

impl RustSqlMapping {
    pub fn of<T: 'static>(sql: String) -> Self {
        Self {
            rust: core::any::type_name::<T>().to_string(),
            sql: sql.to_string(),
            id: core::any::TypeId::of::<T>(),
        }
    }
}