use std::{collections::HashSet, env, path::PathBuf};

#[derive(Debug)]
struct IgnoreMacros(HashSet<String>);

impl bindgen::callbacks::ParseCallbacks for IgnoreMacros {
    fn will_parse_macro(&self, name: &str) -> bindgen::callbacks::MacroParsingBehavior {
        if self.0.contains(name) {
            bindgen::callbacks::MacroParsingBehavior::Ignore
        } else {
            bindgen::callbacks::MacroParsingBehavior::Default
        }
    }
}

fn get_ignored_macros() -> IgnoreMacros {
    let mut ignored = HashSet::new();
    ignored.insert("FE_INVALID".to_string());
    ignored.insert("FE_DIVBYZERO".to_string());
    ignored.insert("FE_OVERFLOW".to_string());
    ignored.insert("FE_UNDERFLOW".to_string());
    ignored.insert("FE_INEXACT".to_string());
    ignored.insert("FE_TONEAREST".to_string());
    ignored.insert("FE_DOWNWARD".to_string());
    ignored.insert("FE_UPWARD".to_string());
    ignored.insert("FE_TOWARDZERO".to_string());
    ignored.insert("FP_NORMAL".to_string());
    ignored.insert("FP_SUBNORMAL".to_string());
    ignored.insert("FP_ZERO".to_string());
    ignored.insert("FP_INFINITE".to_string());
    ignored.insert("FP_NAN".to_string());
    IgnoreMacros(ignored)
}

fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    // This should be the whole directory, but cargo would have to check the whole directory with a lot of files which takes long
    println!("cargo:rerun-if-changed=headers/wrapper.h");
    println!("cargo:rerun-if-changed=headers/vec4.c");
    println!("cargo:rerun-if-changed=Cargo.toml");
    println!("cargo:rerun-if-env-changed=LIBOBS_PATH");

    println!(
        "cargo:rustc-link-search=native={}",
        env!("CARGO_MANIFEST_DIR")
    );
    println!("cargo:rustc-link-lib=dylib=obs");

    if let Some(path) = env::var("LIBOBS_PATH").ok() {
        println!("cargo:rustc-link-search=native={}", path);
    }

    let bindings = bindgen::builder()
        .header("headers/wrapper.h")
        .clang_arg(format!("-I{}", "headers/obs"))
        .blocklist_function("_bindgen_ty_2")
        .parse_callbacks(Box::new(get_ignored_macros()))
        .blocklist_function("_+.*")
        .derive_copy(true)
        .derive_debug(true)
        .derive_default(false)
        .derive_partialeq(true)
        .derive_eq(true)
        .derive_partialord(true)
        .derive_ord(true)
        .layout_tests(false)
        .merge_extern_blocks(true)
        .generate()
        .expect("Error generating bindings");

    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");

        cc::Build::new()
        .file("headers/vec4.c")
        .compile("libvec4.a");
}