hypr-cycle 0.5.1

use anyhow::Result;
use clap::Parser;

use crate::args::Args;
use crate::connection::HyprlandClient;
use crate::domain::{Direction, OwnedMonitor, OwnedWorkspace};

/// Represents the total functionality of the program.
/// It can inspect the connected monitors, the extant workspaces,
/// and can switch between workspaces.
pub struct HyprCycle {
    connection: Box<dyn HyprlandClient>,
}

impl HyprCycle {
    pub fn parse_args() -> Args {
        Args::parse()
    }

    /// The connection can be real or a mock object, as seen in the tests
    /// in `src/service.rs`.
    pub fn new(connection: Box<dyn HyprlandClient>) -> HyprCycle {
        HyprCycle { connection }
    }

    /// This function builds a version of the service backed by a real
    /// HyprlandConnection. It's just for convenience to keep main() clean.
    pub fn real() -> Result<HyprCycle> {
        let conn = hyprrust::HyprlandConnection::current().map_err(anyhow::Error::new)?;
        let client = crate::connection::RealHyprlandClient::new(conn);
        Ok(HyprCycle::new(Box::new(client)))
    }

    /// In Hyprland, only one monitor can be in focus at a time.
    /// This function returns that monitor.
    pub fn get_focused_monitor(&self) -> Result<OwnedMonitor> {
        let monitors = self.connection.get_monitors()?;
        let monitor = monitors
            .into_iter()
            .find(|m| m.focused())
            .ok_or_else(|| anyhow::anyhow!("No focused monitor found"))?;
        Ok(monitor)
    }

    /// Returns a sorted list of the workspaces bound to the provided monitor.
    /// Throws an error if the provided monitor doesn't have any workspaces
    /// bound to it.
    pub fn get_workspaces_for_monitor(
        &self,
        monitor: &OwnedMonitor,
    ) -> Result<Vec<OwnedWorkspace>> {
        let workspaces = self.connection.get_workspaces()?;
        let mut workspaces_for_monitor: Vec<OwnedWorkspace> = workspaces
            .into_iter()
            .filter(|w| w.monitor_name().eq(monitor.name()) && w.visible())
            .collect();
        if workspaces_for_monitor.is_empty() {
            return Err(anyhow::anyhow!(
                "No workspaces found for monitor: {}",
                monitor.name()
            ));
        }
        workspaces_for_monitor.sort();
        Ok(workspaces_for_monitor)
    }

    /// Returns the workspace that's active on the monitor that's in focus
    pub fn get_current_workspace(&self) -> Result<OwnedWorkspace> {
        let focused_monitor = self.get_focused_monitor()?;
        let active_workspace = focused_monitor.active_workspace();
        Ok(active_workspace)
    }

    /// The index of the sorted list of workspaces tells us where to
    /// target the upcoming workspace switch.
    pub fn get_target_workspace(&self, direction: Direction) -> Result<OwnedWorkspace> {
        let monitor = &self.get_focused_monitor()?;
        let workspaces = &self.get_workspaces_for_monitor(monitor)?;
        let current_ws = &self.get_current_workspace()?;

        let idx = workspaces
            .iter()
            .position(|w| w == current_ws)
            .ok_or_else(|| anyhow::anyhow!("Current workspace not found"))?;
        let len = workspaces.len();

        let next_idx = match direction {
            Direction::Next => (idx + 1) % len,
            Direction::Previous => (idx + len - 1) % len,
        };
        Ok(workspaces[next_idx].to_owned())
    }

    pub fn switch_to_workspace(&self, target: &OwnedWorkspace) -> Result<()> {
        self.connection.go_to_workspace(target.id())?;
        Ok(())
    }
}

#[cfg(test)]
pub mod fixtures {
    use crate::domain::{OwnedMonitor, OwnedWorkspace};

    pub fn ws(id: i64, mon: &str) -> OwnedWorkspace {
        OwnedWorkspace::new(id, mon.to_string())
    }

    pub fn mon(name: &str, id: i64, focused: bool, active_id: i64) -> OwnedMonitor {
        OwnedMonitor::new(name.to_string(), id, focused, ws(active_id, name))
    }

    pub fn monitors() -> Vec<OwnedMonitor> {
        vec![
            mon("eDP-1", 1, true, 1), //active monitor
            mon("HDMI-1", 2, false, 3),
        ]
    }

    pub fn workspaces() -> Vec<OwnedWorkspace> {
        vec![
            ws(-97, "eDP-1"), //hidden workspace ("scratch")
            ws(1, "eDP-1"),
            ws(2, "eDP-1"),
            ws(3, "HDMI-1"),
        ]
    }
}

#[cfg(test)]
mod tests {

    use super::*;
    use crate::connection::MockHyprlandClient;

    mod helpers {
        use super::super::*;
        use crate::connection::MockHyprlandClient;
        use anyhow::Context;

        pub fn mock_service_with(conn: MockHyprlandClient) -> HyprCycle {
            HyprCycle::new(Box::new(conn))
        }

        pub fn mock_service() -> HyprCycle {
            let mut conn = MockHyprlandClient::new();
            conn.expect_get_monitors()
                .returning(|| Ok(fixtures::monitors()));
            conn.expect_get_workspaces()
                .returning(|| Ok(fixtures::workspaces()));
            mock_service_with(conn)
        }

        pub fn visible_for_monitor(
            ws: Vec<OwnedWorkspace>,
            monitor: &OwnedMonitor,
        ) -> Vec<OwnedWorkspace> {
            ws.into_iter()
                .filter(|w| w.visible() && w.monitor_name() == monitor.name())
                .collect()
        }

        pub fn focused_monitor(monitors: Vec<OwnedMonitor>) -> Result<OwnedMonitor> {
            monitors
                .into_iter()
                .find(|m| m.focused())
                .context("No focused monitor found")
        }
    }

    /// There are two monitors in the fixture. One is marked active.
    /// This test ensures that the focused monitor is returned by the function.
    #[test]
    fn test_get_focused_monitor() -> Result<()> {
        let expected = helpers::focused_monitor(fixtures::monitors())?;
        let returned = helpers::mock_service().get_focused_monitor()?;
        assert_eq!(returned.name(), expected.name());
        Ok(())
    }

    /// The first monitor has three workspaces, but only two are visible.
    /// This test ensures that only the visible workspaces are returned
    /// by the function.
    #[test]
    fn test_get_workspaces_for_monitor() -> Result<()> {
        let target_monitor = &fixtures::monitors()[0];
        let returned_workspaces =
            helpers::mock_service().get_workspaces_for_monitor(target_monitor)?;
        // All of the returned workspaces are visible
        assert!(returned_workspaces.iter().all(|w| w.visible()));
        // All of the returned workspaces match the argument monitor's name
        assert!(returned_workspaces
            .iter()
            .all(|w| w.monitor_name() == target_monitor.name()));
        // All of the expected workspaces are present
        let expected_workspaces =
            helpers::visible_for_monitor(fixtures::workspaces(), target_monitor);
        assert_eq!(expected_workspaces, returned_workspaces);
        Ok(())
    }

    /// Monitors each keep track of their active workspace.
    /// Of the two monitors in the fixture, one is marked focused.
    /// This test ensures that the function returns the focused monitor's
    /// active workspace.
    #[test]
    fn test_get_current_workspace() -> Result<()> {
        let expected = helpers::focused_monitor(fixtures::monitors())?;
        let returned = helpers::mock_service().get_current_workspace()?;
        assert_eq!(returned.id(), expected.active_workspace().id());
        Ok(())
    }

    /// Hard to test this function's behavior. We can only really ensure that
    /// the right underlying function call is made.
    #[test]
    fn test_switch_to_workspace() -> Result<()> {
        let mut conn = MockHyprlandClient::new();
        conn.expect_go_to_workspace().times(1).returning(|_| Ok(()));
        helpers::mock_service_with(conn).switch_to_workspace(&fixtures::workspaces()[0])
    }
}