// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::path::Path;
use std::path::PathBuf;
use std::{env, path, process::Command};

fn main() {
    if env::var("DOCS_RS").is_ok() {
        return;
    }

    println!("cargo:rerun-if-env-changed=LK_DEBUG_WEBRTC");
    println!("cargo:rerun-if-env-changed=LK_CUSTOM_WEBRTC");

    let mut builder = cxx_build::bridges([
        "src/peer_connection.rs",
        "src/peer_connection_factory.rs",
        "src/media_stream.rs",
        "src/media_stream_track.rs",
        "src/audio_track.rs",
        "src/video_track.rs",
        "src/data_channel.rs",
        "src/frame_cryptor.rs",
        "src/jsep.rs",
        "src/candidate.rs",
        "src/rtp_parameters.rs",
        "src/rtp_sender.rs",
        "src/rtp_receiver.rs",
        "src/rtp_transceiver.rs",
        "src/rtc_error.rs",
        "src/webrtc.rs",
        "src/video_frame.rs",
        "src/video_frame_buffer.rs",
        "src/helper.rs",
        "src/yuv_helper.rs",
        "src/audio_resampler.rs",
        "src/android.rs",
    ]);

    builder.files(&[
        "src/peer_connection.cpp",
        "src/peer_connection_factory.cpp",
        "src/media_stream.cpp",
        "src/media_stream_track.cpp",
        "src/audio_track.cpp",
        "src/video_track.cpp",
        "src/data_channel.cpp",
        "src/jsep.cpp",
        "src/candidate.cpp",
        "src/rtp_receiver.cpp",
        "src/rtp_sender.cpp",
        "src/rtp_transceiver.cpp",
        "src/rtp_parameters.cpp",
        "src/rtc_error.cpp",
        "src/webrtc.cpp",
        "src/video_frame.cpp",
        "src/video_frame_buffer.cpp",
        "src/video_encoder_factory.cpp",
        "src/video_decoder_factory.cpp",
        "src/audio_device.cpp",
        "src/audio_resampler.cpp",
        "src/frame_cryptor.cpp",
    ]);

    let webrtc_dir = webrtc_sys_build::webrtc_dir();
    let webrtc_include = webrtc_dir.join("include");
    let webrtc_lib = webrtc_dir.join("lib");

    if !webrtc_dir.exists() {
        webrtc_sys_build::download_webrtc().unwrap();
    }

    builder.includes(&[
        path::PathBuf::from("./include"),
        webrtc_include.clone(),
        webrtc_include.join("third_party/abseil-cpp/"),
        webrtc_include.join("third_party/libyuv/include/"),
        webrtc_include.join("third_party/libc++/"),
        // For mac & ios
        webrtc_include.join("sdk/objc"),
        webrtc_include.join("sdk/objc/base"),
    ]);

    println!("cargo:rustc-link-search=native={}", webrtc_lib.to_str().unwrap());

    for (key, value) in webrtc_sys_build::webrtc_defines() {
        let value = value.as_deref();
        builder.define(key.as_str(), value);
    }

    // Link webrtc library
    println!("cargo:rustc-link-lib=static=webrtc");

    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
    match target_os.as_str() {
        "windows" => {
            println!("cargo:rustc-link-lib=dylib=msdmo");
            println!("cargo:rustc-link-lib=dylib=wmcodecdspuuid");
            println!("cargo:rustc-link-lib=dylib=dmoguids");
            println!("cargo:rustc-link-lib=dylib=crypt32");
            println!("cargo:rustc-link-lib=dylib=iphlpapi");
            println!("cargo:rustc-link-lib=dylib=ole32");
            println!("cargo:rustc-link-lib=dylib=secur32");
            println!("cargo:rustc-link-lib=dylib=winmm");
            println!("cargo:rustc-link-lib=dylib=ws2_32");
            println!("cargo:rustc-link-lib=dylib=strmiids");
            println!("cargo:rustc-link-lib=dylib=d3d11");
            println!("cargo:rustc-link-lib=dylib=gdi32");
            println!("cargo:rustc-link-lib=dylib=dxgi");
            println!("cargo:rustc-link-lib=dylib=dwmapi");
            println!("cargo:rustc-link-lib=dylib=shcore");

            builder.flag("/std:c++20").flag("/EHsc");
        }
        "linux" => {
            println!("cargo:rustc-link-lib=dylib=Xext");
            println!("cargo:rustc-link-lib=dylib=X11");
            println!("cargo:rustc-link-lib=dylib=GL");
            println!("cargo:rustc-link-lib=dylib=rt");
            println!("cargo:rustc-link-lib=dylib=dl");
            println!("cargo:rustc-link-lib=dylib=pthread");
            println!("cargo:rustc-link-lib=dylib=m");

            builder.flag("-std=c++2a");
        }
        "macos" => {
            println!("cargo:rustc-link-lib=framework=Foundation");
            println!("cargo:rustc-link-lib=framework=AVFoundation");
            println!("cargo:rustc-link-lib=framework=CoreAudio");
            println!("cargo:rustc-link-lib=framework=AudioToolbox");
            println!("cargo:rustc-link-lib=framework=Appkit");
            println!("cargo:rustc-link-lib=framework=CoreMedia");
            println!("cargo:rustc-link-lib=framework=CoreGraphics");
            println!("cargo:rustc-link-lib=framework=VideoToolbox");
            println!("cargo:rustc-link-lib=framework=CoreVideo");
            println!("cargo:rustc-link-lib=framework=OpenGL");
            println!("cargo:rustc-link-lib=framework=Metal");
            println!("cargo:rustc-link-lib=framework=MetalKit");
            println!("cargo:rustc-link-lib=framework=QuartzCore");
            println!("cargo:rustc-link-lib=framework=IOKit");
            println!("cargo:rustc-link-lib=framework=IOSurface");

            configure_darwin_sysroot(&mut builder);

            builder
                .file("src/objc_video_factory.mm")
                .file("src/objc_video_frame_buffer.mm")
                .flag("-stdlib=libc++")
                .flag("-std=c++20");
        }
        "ios" => {
            println!("cargo:rustc-link-lib=framework=CoreFoundation");
            println!("cargo:rustc-link-lib=framework=AVFoundation");
            println!("cargo:rustc-link-lib=framework=CoreAudio");
            println!("cargo:rustc-link-lib=framework=UIKit");
            println!("cargo:rustc-link-lib=framework=CoreVideo");
            println!("cargo:rustc-link-lib=framework=CoreGraphics");
            println!("cargo:rustc-link-lib=framework=CoreMedia");
            println!("cargo:rustc-link-lib=framework=VideoToolbox");
            println!("cargo:rustc-link-lib=framework=AudioToolbox");
            println!("cargo:rustc-link-lib=framework=OpenGLES");
            println!("cargo:rustc-link-lib=framework=GLKit");
            println!("cargo:rustc-link-lib=framework=Metal");
            println!("cargo:rustc-link-lib=framework=MetalKit");
            println!("cargo:rustc-link-lib=framework=Network");
            println!("cargo:rustc-link-lib=framework=QuartzCore");

            configure_darwin_sysroot(&mut builder);

            builder
                .file("src/objc_video_factory.mm")
                .file("src/objc_video_frame_buffer.mm")
                .flag("-std=c++20");
        }
        "android" => {
            webrtc_sys_build::configure_jni_symbols().unwrap();

            println!("cargo:rustc-link-lib=EGL");
            println!("cargo:rustc-link-lib=c++abi");
            println!("cargo:rustc-link-lib=OpenSLES");

            configure_android_sysroot(&mut builder);

            builder.file("src/android.cpp").flag("-std=c++20").cpp_link_stdlib("c++_static");
        }
        _ => {
            panic!("Unsupported target, {}", target_os);
        }
    }

    // TODO(theomonnom) Only add this define when building tests
    builder.define("LIVEKIT_TEST", None);
    builder.warnings(false).compile("webrtcsys-cxx");

    for entry in glob::glob("./src/**/*.cpp").unwrap() {
        println!("cargo:rerun-if-changed={}", entry.unwrap().display());
    }

    for entry in glob::glob("./src/**/*.mm").unwrap() {
        println!("cargo:rerun-if-changed={}", entry.unwrap().display());
    }

    for entry in glob::glob("./include/**/*.h").unwrap() {
        println!("cargo:rerun-if-changed={}", entry.unwrap().display());
    }

    if target_os.as_str() == "android" {
        copy_libwebrtc_jar(&PathBuf::from(Path::new(&webrtc_dir)));
    }
}

fn copy_libwebrtc_jar(webrtc_dir: &PathBuf) {
    let jar_path = webrtc_dir.join("libwebrtc.jar");
    let output_path = get_output_path();
    let output_jar_path = output_path.join("libwebrtc.jar");
    let res = std::fs::copy(jar_path, output_jar_path);
    if let Err(e) = res {
        println!("Failed to copy libwebrtc.jar: {}", e);
    }
}

fn get_output_path() -> PathBuf {
    let manifest_dir_string = env::var("CARGO_MANIFEST_DIR").unwrap();
    let build_type = env::var("PROFILE").unwrap();
    let build_target = env::var("TARGET").unwrap();
    let path =
        Path::new(&manifest_dir_string).join("../target").join(build_target).join(build_type);
    return PathBuf::from(path);
}

fn configure_darwin_sysroot(builder: &mut cc::Build) {
    let target_os = webrtc_sys_build::target_os();

    let sdk = match target_os.as_str() {
        "mac" => "macosx",
        "ios-device" => "iphoneos",
        "ios-simulator" => "iphonesimulator",
        _ => panic!("Unsupported target_os: {}", target_os),
    };

    let clang_rt = match target_os.as_str() {
        "mac" => "clang_rt.osx",
        "ios-device" => "clang_rt.ios",
        "ios-simulator" => "clang_rt.iossim",
        _ => panic!("Unsupported target_os: {}", target_os),
    };

    println!("cargo:rustc-link-lib={}", clang_rt);
    println!("cargo:rustc-link-arg=-ObjC");

    let sysroot = Command::new("xcrun").args(["--sdk", sdk, "--show-sdk-path"]).output().unwrap();

    let sysroot = String::from_utf8_lossy(&sysroot.stdout);
    let sysroot = sysroot.trim();

    let search_dirs = Command::new("clang").arg("--print-search-dirs").output().unwrap();

    let search_dirs = String::from_utf8_lossy(&search_dirs.stdout);
    for line in search_dirs.lines() {
        if line.contains("libraries: =") {
            let path = line.split('=').nth(1).unwrap();
            let path = format!("{}/lib/darwin", path);
            println!("cargo:rustc-link-search={}", path);
        }
    }

    builder.flag(format!("-isysroot{}", sysroot).as_str());
}

fn configure_android_sysroot(builder: &mut cc::Build) {
    let toolchain = webrtc_sys_build::android_ndk_toolchain().unwrap();
    let toolchain_lib = toolchain.join("lib");

    let sysroot = toolchain.join("sysroot").canonicalize().unwrap();
    println!("cargo:rustc-link-search={}", toolchain_lib.display());

    builder.flag(format!("-isysroot{}", sysroot.display()).as_str());
}