//! Rust client generation.
//!
//! This module generates a Rust client with full type safety for the BRK API.

pub mod api;
pub mod client;
pub mod tree;
mod types;

use std::{fmt::Write, io, path::Path};

use super::write_if_changed;
use crate::{ClientMetadata, Endpoint};

/// Generate Rust client from metadata and OpenAPI endpoints.
///
/// `output_path` is the full path to the output file (e.g., "crates/brk_client/src/lib.rs").
pub fn generate_rust_client(
    metadata: &ClientMetadata,
    endpoints: &[Endpoint],
    output_path: &Path,
) -> io::Result<()> {
    let mut output = String::new();

    writeln!(output, "// Auto-generated BRK Rust client").unwrap();
    writeln!(output, "// Do not edit manually\n").unwrap();
    writeln!(output, "#![allow(non_camel_case_types)]").unwrap();
    writeln!(output, "#![allow(dead_code)]").unwrap();
    writeln!(output, "#![allow(unused_variables)]").unwrap();
    writeln!(output, "#![allow(clippy::useless_format)]").unwrap();
    writeln!(output, "#![allow(clippy::unnecessary_to_owned)]\n").unwrap();

    client::generate_imports(&mut output);
    client::generate_base_client(&mut output);
    client::generate_series_pattern_trait(&mut output);
    client::generate_endpoint(&mut output);
    client::generate_index_accessors(&mut output, &metadata.index_set_patterns);
    client::generate_pattern_structs(&mut output, &metadata.structural_patterns, metadata);
    tree::generate_tree(&mut output, &metadata.catalog, metadata);
    api::generate_main_client(&mut output, endpoints);

    write_if_changed(output_path, &output)?;

    Ok(())
}