// build.rs
// Automatic binding generation from API definitions

use std::env;
use std::fs;
use std::path::Path;

fn main() {
    // Only generate bindings in release mode or when specifically requested
    let should_generate = env::var("CARGO_FEATURE_GENERATE_BINDINGS").is_ok() ||
                         env::var("PROFILE").map(|p| p == "release").unwrap_or(false);
    
    if !should_generate {
        println!("cargo:warning=Skipping binding generation. Set GENERATE_BINDINGS feature to force generation.");
        return;
    }

    println!("cargo:rerun-if-changed=src/api_definition.rs");
    println!("cargo:rerun-if-changed=src/codegen/");
    println!("cargo:rerun-if-changed=build.rs");

    // Create output directories
    let out_dir = env::var("OUT_DIR").unwrap();
    let bindings_dir = Path::new(&out_dir).join("generated_bindings");
    fs::create_dir_all(&bindings_dir).unwrap();

    // We'll use a simple approach here since we can't easily import the crate's modules
    // In a real implementation, you'd want to separate the API definition into a separate crate
    println!("cargo:warning=Binding generation requires the nucleation crate to be available.");
    println!("cargo:warning=Run `cargo run --bin generate-bindings` instead for full generation.");

    // For now, just create placeholder files to indicate the build script ran
    let timestamp = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap()
        .as_secs();
    
    fs::write(
        bindings_dir.join("build_timestamp.txt"),
        format!("Build completed at: {}", timestamp)
    ).unwrap();
}
