//! Fake terminal transports, local and remote.

use super::*;

#[derive(Clone, Copy, Default)]
pub enum FakeBehavior {
    #[default]
    Running,
    ExitFirst,
    FailFirst,
    ReportsOs(HostOs),
    ReportsLatency(Latency),
}

#[derive(Default)]
pub struct FakeTerminalFactory {
    pub starts: AtomicUsize,
    pub behavior: FakeBehavior,
    pub writes: Arc<Mutex<Vec<Vec<u8>>>>,
    pub resizes: Arc<Mutex<Vec<TerminalSize>>>,
}

impl FakeTerminalFactory {
    pub fn exit_first() -> Self {
        Self {
            behavior: FakeBehavior::ExitFirst,
            ..Self::default()
        }
    }

    pub fn fail_first() -> Self {
        Self {
            behavior: FakeBehavior::FailFirst,
            ..Self::default()
        }
    }

    pub fn reports_os(os: HostOs) -> Self {
        Self {
            behavior: FakeBehavior::ReportsOs(os),
            ..Self::default()
        }
    }

    pub fn reports_latency(latency: Latency) -> Self {
        Self {
            behavior: FakeBehavior::ReportsLatency(latency),
            ..Self::default()
        }
    }

    pub fn written_text(&self) -> String {
        let bytes: Vec<_> = self
            .writes
            .lock()
            .unwrap_or_else(|error| error.into_inner())
            .iter()
            .flatten()
            .copied()
            .collect();
        String::from_utf8(bytes).expect("fake transport receives UTF-8 test input")
    }

    pub fn starts(&self) -> usize {
        self.starts.load(Ordering::SeqCst)
    }
}

impl TerminalTransportFactory for FakeTerminalFactory {
    fn create(&self) -> Box<dyn TerminalTransport> {
        let run = self.starts.fetch_add(1, Ordering::SeqCst) + 1;
        Box::new(FakeTerminalTransport {
            run,
            behavior: self.behavior,
            writes: self.writes.clone(),
            resizes: self.resizes.clone(),
        })
    }
}

pub struct FakeTerminalTransport {
    pub run: usize,
    pub behavior: FakeBehavior,
    pub writes: Arc<Mutex<Vec<Vec<u8>>>>,
    pub resizes: Arc<Mutex<Vec<TerminalSize>>>,
}

impl TerminalTransport for FakeTerminalTransport {
    fn run(
        self: Box<Self>,
        _: TerminalSize,
        commands: mpsc::Receiver<TerminalTransportCommand>,
        events: async_channel::Sender<TerminalTransportEvent>,
    ) -> anyhow::Result<()> {
        if matches!(self.behavior, FakeBehavior::FailFirst) && self.run == 1 {
            anyhow::bail!("测试启动失败");
        }
        events.send_blocking(TerminalTransportEvent::Started)?;
        if let FakeBehavior::ReportsOs(os) = self.behavior {
            events.send_blocking(TerminalTransportEvent::HostOsDetected(os))?;
        }
        if let FakeBehavior::ReportsLatency(latency) = self.behavior {
            events.send_blocking(TerminalTransportEvent::Latency(latency))?;
        }
        events.send_blocking(TerminalTransportEvent::Output(
            format!(
                "\x1b]0;测试终端 {}\x07run:{}$ alpha.txt 会议纪要.md\r\n",
                self.run, self.run
            )
            .into_bytes(),
        ))?;
        if matches!(self.behavior, FakeBehavior::ExitFirst) && self.run == 1 {
            events.send_blocking(TerminalTransportEvent::Exited {
                code: 9,
                signal: None,
            })?;
            return Ok(());
        }
        while let Ok(command) = commands.recv() {
            match command {
                TerminalTransportCommand::Write(bytes) => {
                    self.writes
                        .lock()
                        .unwrap_or_else(|error| error.into_inner())
                        .push(bytes.clone());
                    events.send_blocking(TerminalTransportEvent::Output(bytes))?;
                }
                TerminalTransportCommand::Resize(size) => {
                    self.resizes
                        .lock()
                        .unwrap_or_else(|error| error.into_inner())
                        .push(size);
                }
                TerminalTransportCommand::PromptReply { .. } => {}
                TerminalTransportCommand::Shutdown => break,
            }
        }
        Ok(())
    }
}

pub fn open_workspace_with_remote_factory(
    cx: &mut TestAppContext,
    store: HostStore,
    factory: Arc<dyn TerminalTransportFactory>,
) -> (WindowHandle<Root>, Entity<Workspace>) {
    cx.update(shellrs::init);
    // Dialogs still, as in every fixture: see `open_workspace_with_tester`.
    cx.update(|cx| cx.set_reduce_motion(true));
    let mut workspace = None;
    let handle = cx.open_window(size(px(1280.), px(800.)), |window, cx| {
        let store = cx.new(|_| store);
        let remote = Arc::new(FixedRemoteTerminalTransportProvider::new(factory.clone()));
        let view = cx.new(|cx| {
            Workspace::new_with_services(
                store,
                cx.new(|_| SettingsStore::in_memory()),
                remote,
                Arc::new(FakeTerminalFactory::default()),
                Arc::new(FakeSftpProvider::default()),
                Arc::new(FakeLocalDirectory::default()),
                Arc::new(FakeConnectionTester::default()),
                Arc::new(FakeForwardProvider::default()),
                window,
                cx,
            )
        });
        workspace = Some(view.clone());
        Root::new(view, window, cx)
    });
    (handle, workspace.expect("workspace created"))
}

pub fn remote_lifecycle(
    workspace: &Entity<Workspace>,
    id: RemoteTerminalId,
    cx: &App,
) -> TerminalLifecycle {
    workspace
        .read(cx)
        .remote_terminal(id)
        .expect("terminal exists")
        .read(cx)
        .lifecycle(cx)
}

/// Hands every remote terminal the same fake, recording the login each one
/// was started with.
#[derive(Default)]
pub struct RecordingRemoteProvider {
    pub factory: Arc<FakeTerminalFactory>,
    pub logins: Mutex<Vec<HostLogin>>,
}

impl RecordingRemoteProvider {
    pub fn logins(&self) -> Vec<HostLogin> {
        self.logins
            .lock()
            .unwrap_or_else(|error| error.into_inner())
            .clone()
    }
}

impl RemoteTerminalTransportProvider for RecordingRemoteProvider {
    fn factory_for(&self, login: &HostLogin) -> SharedTerminalTransportFactory {
        self.logins
            .lock()
            .unwrap_or_else(|error| error.into_inner())
            .push(login.clone());
        self.factory.clone()
    }
}