use std::path::PathBuf;

/// Compiles raylib
fn compile_raylib(raylib_path: &str) {
    // Construct a config for running cmake
    let mut cmake_config = cmake::Config::new(raylib_path);
    let mut cmake_config = cmake_config
        .define("BUILD_EXAMPLES", "OFF")
        .define("CMAKE_BUILD_TYPE", "Release");

    // Set the correct build profile
    #[cfg(debug_assertions)]
    {
        cmake_config = cmake_config.profile("Debug");
    }

    #[cfg(not(debug_assertions))]
    {
        cmake_config = cmake_config.profile("Release");
    }

    // Build the cmake project
    let destination = cmake_config.build();

    // Tell cargo where the libraries might be
    println!("cargo:rustc-link-search=native={}", destination.join("lib").display());
    println!("cargo:rustc-link-search=native={}", destination.join("lib32").display());
    println!("cargo:rustc-link-search=native={}", destination.join("lib64").display());
}

/// Links libraries
fn link_libs() {
    // Handle windows libs
    if cfg!(windows) {
        println!("cargo:rustc-link-lib=dylib=winmm");
        println!("cargo:rustc-link-lib=dylib=gdi32");
        println!("cargo:rustc-link-lib=dylib=user32");
        println!("cargo:rustc-link-lib=dylib=shell32");
    }
    // Handle MacOS
    else if cfg!(target_os = "macos") {
        println!("cargo:rustc-link-search=native=/usr/local/lib");
        println!("cargo:rustc-link-lib=framework=OpenGL");
        println!("cargo:rustc-link-lib=framework=Cocoa");
        println!("cargo:rustc-link-lib=framework=IOKit");
        println!("cargo:rustc-link-lib=framework=CoreFoundation");
        println!("cargo:rustc-link-lib=framework=CoreVideo");
    }
    // Handle UNIX
    else if cfg!(unix) {
        println!("cargo:rustc-link-search=/usr/local/lib");
        println!("cargo:rustc-link-lib=X11");
    }
    // Fail on other platforms
    else {
        panic!("Unsupported platform");
    }

    // Link raylib itself
    println!("cargo:rustc-link-lib=static=raylib");
}

/// Generates `bindings.rs` file
fn generate_bindings(header_file: &str) {
    // Generate the data
    let bindings = bindgen::Builder::default()
        .header(header_file)
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .generate()
        .expect("Unable to generate bindings");

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

pub fn main() {
    // Files to watch that should trigger a rebuild
    println!("cargo:rerun-if-changed=src/wrapper.h");

    // Compile raylib
    compile_raylib("third_party/raylib");

    // Link libraries
    link_libs();

    // Generate bindings
    generate_bindings("src/wrapper.h");
}