#![cfg(feature = "nix-flake-c")]
#![cfg(test)]

use std::ptr;

use serial_test::serial;

use nixide_sys::*;

#[test]
#[serial]
fn flake_settings_new_and_free() {
    unsafe {
        let ctx = nix_c_context_create();
        assert!(!ctx.is_null());

        // Create new flake settings
        let settings = nix_flake_settings_new(ctx);
        assert!(!settings.is_null(), "nix_flake_settings_new returned null");

        // Free flake settings (should not crash)
        nix_flake_settings_free(settings);

        nix_c_context_free(ctx);
    }
}

#[test]
#[serial]
fn flake_settings_add_to_eval_state_builder() {
    unsafe {
        let ctx = nix_c_context_create();
        assert!(!ctx.is_null());

        let err = nix_libutil_init(ctx);
        assert_eq!(err, NixErr::Ok);

        let err = nix_libstore_init(ctx);
        assert_eq!(err, NixErr::Ok);

        let err = nix_libexpr_init(ctx);
        assert_eq!(err, NixErr::Ok);

        let store = nix_store_open(ctx, ptr::null(), ptr::null_mut());
        assert!(!store.is_null());

        let builder = nix_eval_state_builder_new(ctx, store);
        assert!(!builder.is_null());

        let settings = nix_flake_settings_new(ctx);
        assert!(!settings.is_null(), "nix_flake_settings_new returned null");

        // Add flake settings to eval state builder
        let err = nix_flake_settings_add_to_eval_state_builder(ctx, settings, builder);
        // Accept OK or ERR_UNKNOWN (depends on Nix build/config)
        assert!(
            err == NixErr::Ok || err == NixErr::Unknown,
            "nix_flake_settings_add_to_eval_state_builder returned unexpected error code: {err}"
        );

        nix_flake_settings_free(settings);
        nix_eval_state_builder_free(builder);
        nix_store_free(store);
        nix_c_context_free(ctx);
    }
}

#[test]
#[serial]
fn flake_settings_null_context() {
    // Passing NULL context should not crash, but may error
    unsafe {
        let settings = nix_flake_settings_new(ptr::null_mut());
        // May return null if context is required
        if !settings.is_null() {
            nix_flake_settings_free(settings);
        }
    }
}