/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//! Functions to calculate names for FFI symbols
//!
//! All of these functions input a `namespace` parameter which is:
//!   - The UDL namespace for UDL-based generation
//!   - The "module path" of the item for proc-macro based generation.  Right now this is actually just the
//!     crate name, but we eventually hope to make this the full module path.
//!
//! This could cause collisions in the case where you combine UDL and proc-macro generation and you
//! set the UDL namespace to the name of another crate. This seems so pathological that it's not
//! worth the code complexity to prevent it.

use crate::crate_name;

/// FFI symbol name for a top-level function
pub fn fn_symbol_name(module_path: &str, name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let name = name.to_ascii_lowercase();
    format!("uniffi_{namespace}_fn_func_{name}")
}

/// FFI symbol name for an object constructor
pub fn constructor_symbol_name(module_path: &str, object_name: &str, name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let object_name = object_name.to_ascii_lowercase();
    let name = name.to_ascii_lowercase();
    format!("uniffi_{namespace}_fn_constructor_{object_name}_{name}")
}

/// FFI symbol name for an object method
pub fn method_symbol_name(module_path: &str, object_name: &str, name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let object_name = object_name.to_ascii_lowercase();
    let name = name.to_ascii_lowercase();
    format!("uniffi_{namespace}_fn_method_{object_name}_{name}")
}

/// FFI symbol name for the `clone` function for an object.
pub fn clone_fn_symbol_name(module_path: &str, object_name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let object_name = object_name.to_ascii_lowercase();
    format!("uniffi_{namespace}_fn_clone_{object_name}")
}

/// FFI symbol name for the `free` function for an object.
pub fn free_fn_symbol_name(module_path: &str, object_name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let object_name = object_name.to_ascii_lowercase();
    format!("uniffi_{namespace}_fn_free_{object_name}")
}

/// FFI symbol name for the `init_callback` function for a callback interface
pub fn init_callback_vtable_fn_symbol_name(
    module_path: &str,
    callback_interface_name: &str,
) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let callback_interface_name = callback_interface_name.to_ascii_lowercase();
    format!("uniffi_{namespace}_fn_init_callback_vtable_{callback_interface_name}")
}

/// FFI checksum symbol name for a top-level function
pub fn fn_checksum_symbol_name(module_path: &str, name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let name = name.to_ascii_lowercase();
    format!("uniffi_{namespace}_checksum_func_{name}")
}

/// FFI checksum symbol name for an object constructor
pub fn constructor_checksum_symbol_name(
    module_path: &str,
    object_name: &str,
    name: &str,
) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let object_name = object_name.to_ascii_lowercase();
    let name = name.to_ascii_lowercase();
    format!("uniffi_{namespace}_checksum_constructor_{object_name}_{name}")
}

/// FFI checksum symbol name for an object method
pub fn method_checksum_symbol_name(module_path: &str, object_name: &str, name: &str) -> String {
    let namespace = crate_name(module_path).replace("::", "__");
    let object_name = object_name.to_ascii_lowercase();
    let name = name.to_ascii_lowercase();
    format!("uniffi_{namespace}_checksum_method_{object_name}_{name}")
}

/// Get the symbol name for a FFI-buffer version of a function
pub fn ffi_buffer_symbol_name(fn_name: &str) -> String {
    match fn_name.strip_prefix("uniffi_") {
        Some(rest) => format!("uniffi_ffibuffer_{rest}"),
        // this should never happen, but if it does let's try our best to prefix things properl.
        None => format!("uniffi_ffibuffer_{fn_name}"),
    }
}