fn main() {
    // INTERIM: both llama-cpp-sys-2 and whisper-rs-sys statically link
    // their own copy of ggml, so GNU ld / lld see duplicate symbols when
    // linking the kon binary and its lib-tests. --allow-multiple-definition
    // makes the linker pick the first definition; safe while both crates
    // pin compatible ggml revisions. Replace with a system-ggml shared-lib
    // setup as a follow-up.
    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("linux") {
        println!("cargo:rustc-link-arg=-Wl,--allow-multiple-definition");
    }

    assert_localhost_llm_csp();

    tauri_build::build()
}

/// Regression guard for brief item #2 (pre-emptive localhost LLM scope).
///
/// Kon's bundled llama.cpp server and any BYO Ollama install speak HTTP
/// on `127.0.0.1:*`. If the `connect-src` CSP ever drops those entries,
/// `fetch()` from the webview to the local LLM silently 404s with an
/// opaque scope error (Vibe #438 / #487). We keep the current permit
/// pinned at build time so a stray edit can't regress it unnoticed.
fn assert_localhost_llm_csp() {
    let conf_path = std::path::Path::new("tauri.conf.json");
    println!("cargo:rerun-if-changed=tauri.conf.json");

    let raw = std::fs::read_to_string(conf_path)
        .expect("build.rs: failed to read tauri.conf.json for CSP regression guard");
    let csp_start = raw
        .find("\"csp\"")
        .expect("build.rs: tauri.conf.json missing \"csp\" field");
    // Read the rest of the CSP string — we only need to substring-search.
    let csp_slice = &raw[csp_start..];
    for required in ["http://127.0.0.1:*", "ws://127.0.0.1:*"] {
        assert!(
            csp_slice.contains(required),
            "build.rs: tauri.conf.json CSP must permit {required} for local LLM \
             connectivity (brief item #2). Restore the connect-src entry before \
             building."
        );
    }
}