mod server;

use anyhow::Result;
use gst::glib;
use gst::glib::once_cell::sync::Lazy;
use gst::prelude::*;
use rand::prelude::*;
use std::thread;
use std::thread::sleep;
use tokio::runtime::Builder;

static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
    gst::DebugCategory::new("hawkear", gst::DebugColorFlags::empty(), Some("Main function"))
});

#[derive(Debug, Clone, Copy)]
struct DtmfEvent(i32);

impl TryFrom<&gst::StructureRef> for DtmfEvent {
    type Error = anyhow::Error;

    fn try_from(structure: &gst::StructureRef) -> anyhow::Result<Self> {
        let name = structure.name().to_string();
        if name != "dtmf-event" {
            anyhow::bail!("Not a dtmf-event structure: {name}");
        }
        let number = structure.get::<i32>("number")?;
        Ok(Self(number))
    }
}

#[derive(Debug, Clone, Copy)]
enum DtmfCommand {
    Start(i32),
    End(i32),
}

impl DtmfCommand {
    fn start(number: i32) -> Self {
        Self::Start(number)
    }

    fn end(self) -> Self {
        match self {
            Self::Start(number) => Self::End(number),
            Self::End(_) => self,
        }
    }
}

impl TryFrom<&gst::StructureRef> for DtmfCommand {
    type Error = anyhow::Error;

    fn try_from(structure: &gst::StructureRef) -> anyhow::Result<Self> {
        let name = structure.name().to_string();
        if !name.starts_with("dtmf-event") {
            anyhow::bail!("Not a dtmf-event structure: {name}");
        }
        let number = structure.get::<i32>("number")?;
        if structure.get::<bool>("start")? {
            Ok(Self::Start(number))
        } else {
            Ok(Self::End(number))
        }
    }
}

impl From<DtmfCommand> for gst::Structure {
    fn from(event: DtmfCommand) -> Self {
        match event {
            DtmfCommand::Start(number) => gst::Structure::builder("dtmf-event")
                .field("type", 1)
                .field("start", true)
                .field("number", number)
                .field("volume", 36)
                .build(),
            DtmfCommand::End(number) => {
                gst::Structure::builder("dtmf-event")
                    .field("type", 1)
                    .field("start", false)
                    .field("number", number)
                    .build()
            }
        }
    }
}

fn main() -> Result<()> {
    gst::init()?;

    let pipeline = gst::parse_launch(
        r#"

    srtsrc uri="srt://3.221.115.181:6002" ! decodebin name=d ! queue name=vid-queue ! videoconvert ! autovideosink
      d. ! queue name=main-audio-queue ! audioconvert name=conv-main ! autoaudiosink name=audiosink
      d. ! queue name=dtmf-tones-queue ! deinterleave name=deinter ! audioresample ! audioconvert name=conv-tone ! dtmfdetect ! fakesink name=dtmf_sink

    "#,
    )?
    .downcast::<gst::Pipeline>()
    .unwrap();

    let context = glib::MainContext::default();
    let main_loop = glib::MainLoop::new(Some(&context), false);

    let bus = pipeline.bus().unwrap();
    bus.add_watch({
        let main_loop = main_loop.clone();
        move |_, msg| {
            use gst::MessageView;
            let main_loop = &main_loop;
            match msg.view() {
                MessageView::Eos(..) => main_loop.quit(),
                MessageView::Error(err) => {
                    gst::error!(CAT, obj: err.src().unwrap(),
                        "Error from {:?}: {} ({:?})",
                        err.src().map(|s| s.path_string()),
                        err.error(),
                        err.debug()
                    );
                    main_loop.quit();
                }
                MessageView::Element(element) => {
                    match element.structure().unwrap().name().as_str() {
                        "dtmf-event" => {
                            gst::info!(CAT, "Received DTMF event: {:?}", element.structure().unwrap());
                            let dtmf_event = DtmfEvent::try_from(element.structure().unwrap())
                                .expect("Failed to parse DTMF event");
                            gst::info!(CAT, "Parsed the detected DTMF event: {:?}", dtmf_event);
                        }
                        "dtmf-event-processed" => {
                            let dtmf_cmd = match DtmfCommand::try_from(element.structure().unwrap())
                            {
                                Ok(ev) => ev,
                                Err(err) => {
                                    gst::error!(
                                        CAT,
                                        "Failed to parse DTMF event {:?} with error: {:?}",
                                        element.structure().unwrap(),
                                        err
                                    );
                                    return glib::Continue(true);
                                }
                            };
                            match dtmf_cmd {
                                DtmfCommand::Start(number) => {
                                    gst::trace!(CAT, "Processed DTMF event {number}");
                                }
                                DtmfCommand::End(number) => {
                                    gst::trace!(CAT, "Processed ending DTMF event: {number}");
                                }
                            }
                        }
                        _ => {
                            gst::error!(
                                CAT,
                                "Received unknown event: {:?}",
                                element.structure().unwrap().name()
                            );
                        }
                    }
                }
                _ => (),
            };
            glib::Continue(true)
        }
    })
    .expect("Failed to add bus watch");

    // thread::spawn({
    //     let pipeline_weak = pipeline.downgrade();
    //     move || {
    //         let Some(pipeline) = pipeline_weak.upgrade() else {
    //             gst::error!(CAT, "Pipeline gone...");
    //             return;
    //         };
    //
    //         let source = pipeline.by_name("src").unwrap();
    //         //
    //         // // wait pipeline to be running
    //         // let bus = pipeline.bus().unwrap();
    //         // while let Some(msg) = bus.timed_pop(None) {
    //         //     use gst::MessageView;
    //         //     if let MessageView::StateChanged(state_changed) = msg.view() {
    //         //         if state_changed.src().unwrap() == &source
    //         //             && state_changed.current() == gst::State::Playing
    //         //         {
    //         //             break;
    //         //         }
    //         //     }
    //         // }
    //         // gst::info!(CAT, "Pipeline is running");
    //
    //         // sleep(std::time::Duration::from_secs(5));
    //         // source.send_event(gst::event::CustomUpstream::new(DtmfCommand::start(0).into()));
    //         // gst::info!(CAT, "Sent DTMF event");
    //
    //         // let mut rng = rand::thread_rng();
    //         // loop {
    //             // let dtmf_cmd = DtmfCommand::start(rng.gen_range(0..15));
    //
    //             // source.send_event(gst::event::CustomUpstream::new(DtmfCommand::start(0).into()));
    //             // gst::info!(CAT, "Sent DTMF event {:?}", dtmf_cmd);
    //
    //
    //             // source.send_event(gst::event::CustomUpstream::new(dtmf_cmd.end().into()));
    //
    //             // sleep(std::time::Duration::from_millis(1000));
    //         // }
    //     }
    // });

    thread::spawn({
        let pipeline_weak = pipeline.downgrade();
        move || {
            let runtime = Builder::new_multi_thread()
                .worker_threads(2)
                .thread_name("http-server")
                .enable_all()
                .build()
                .unwrap();
            runtime.block_on(server::run(8080, pipeline_weak))
        }
    });

    pipeline.set_state(gst::State::Playing)?;

    ctrlc::set_handler({
        let main_loop = main_loop.clone();
        move || {
            main_loop.quit();
        }
    })?;

    main_loop.run();

    pipeline.set_state(gst::State::Null)?;
    bus.remove_watch().unwrap();

    Ok(())
}