arcature-cli 2026.1.1

//! `arc make service <name> --module <module>` — generate a service struct.
//!
//! Creates `src/<module>/<name>_service.rs` with a `#[service]` struct, and
//! appends `pub mod <name>_service;` to the module's `mod.rs`. The service
//! name is PascalCase (e.g. `Link`); the file stem is snake_case (e.g.
//! `link_service`).

use std::path::Path;

use super::naming::{
    append_mod_declaration, mod_declaration, module_file_path, snake_case, validate_module_name,
    validate_type_name,
};
use super::write::{GeneratedFile, module_mod_rs};

pub(crate) fn generate(
    root: &Path,
    raw_name: &str,
    raw_module: &str,
) -> Result<(GeneratedFile, String), String> {
    let name = validate_type_name(raw_name)?;
    let module = validate_module_name(raw_module)?;
    let service_name = if name.ends_with("Service") {
        name.clone()
    } else {
        format!("{name}Service")
    };
    let stem = format!("{}_service", snake_case(&name));
    let path = module_file_path(root, &module, &format!("{stem}.rs"))?;
    let content = render(&service_name, &module);
    let file = GeneratedFile {
        path: path.clone(),
        content,
    };
    let mod_rs = module_mod_rs(root, &module);
    let declaration = mod_declaration(&stem)?;
    let mod_msg = append_mod_declaration(&mod_rs, &declaration)?;
    Ok((file, mod_msg))
}

fn render(service_name: &str, module: &str) -> String {
    format!(
        "//! `{service_name}` — service for the `{module}` module.\n\
         \n\
         use arcature::prelude::*;\n\
         \n\
         /// A service composed from application resources. The `#[service]` macro\n\
         /// generates `DxComponent`, `Service`, and `Resolve<S>`. Add fields for\n\
         /// your dependencies and business methods by hand.\n\
         #[arcature::service]\n\
         pub struct {service_name} {{\n\
         \x20   // Add dependency fields here (e.g. db: Db, cache: Cache).\n\
         }}\n"
    )
}