netrunner 2.0.4

//! Application state and update logic for the GPUI desktop app.

use futures::StreamExt;
use gpui::{Context, SharedString};
use netrunner_core::{HistoryStorage, Settings, SpeedTestResult, TestConfig, TestEvent};

use crate::engine::spawn_speed_test;

/// Which transfer the live chart is currently tracking.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Phase {
    Idle,
    Locating,
    Servers,
    Latency,
    Download,
    Upload,
    Done,
}

impl Phase {
    pub fn label(self) -> &'static str {
        match self {
            Phase::Idle => "Ready",
            Phase::Locating => "Detecting location…",
            Phase::Servers => "Selecting servers…",
            Phase::Latency => "Measuring latency…",
            Phase::Download => "Testing download…",
            Phase::Upload => "Testing upload…",
            Phase::Done => "Complete",
        }
    }
}

/// Maximum number of samples kept for each live chart.
pub const MAX_SAMPLES: usize = 120;

/// Test servers cycled through by the settings panel.
pub const SERVER_PRESETS: &[&str] = &[
    "https://speed.cloudflare.com",
    "https://httpbin.org",
    "https://www.google.com",
    "https://fast.com",
];

/// The root application entity.
pub struct SpeedApp {
    pub config: TestConfig,
    pub settings: Settings,
    pub status: SharedString,
    pub phase: Phase,
    pub running: bool,

    pub download_samples: Vec<f32>,
    pub upload_samples: Vec<f32>,

    pub download_mbps: f32,
    pub upload_mbps: f32,
    pub peak_download: f32,
    pub peak_upload: f32,
    pub ping_ms: f32,

    pub location: Option<SharedString>,
    pub isp: Option<SharedString>,
    pub server: Option<SharedString>,
    pub result: Option<SpeedTestResult>,

    /// Recent past runs, newest first (read from the shared redb history).
    pub history: Vec<SpeedTestResult>,
}

impl SpeedApp {
    /// Build a fresh, side-effect-free state (no disk access — see [`Self::boot`]).
    pub fn new() -> Self {
        let settings = Settings::default();
        Self {
            config: settings.to_config(),
            settings,
            status: "Ready to jack in.".into(),
            phase: Phase::Idle,
            running: false,
            download_samples: Vec::new(),
            upload_samples: Vec::new(),
            download_mbps: 0.0,
            upload_mbps: 0.0,
            peak_download: 0.0,
            peak_upload: 0.0,
            ping_ms: 0.0,
            location: None,
            isp: None,
            server: None,
            result: None,
            history: Vec::new(),
        }
    }

    /// Load persisted settings (JSON) and history (redb) from disk.
    ///
    /// Kept separate from [`Self::new`] so unit tests stay pure and don't touch
    /// the user's real config/history files.
    pub fn boot(&mut self) {
        self.settings = Settings::load();
        self.config = self.settings.to_config();
        self.reload_history();
    }

    /// Re-read recent runs from the shared history database.
    pub fn reload_history(&mut self) {
        if let Ok(store) = HistoryStorage::new() {
            if let Ok(results) = store.get_recent_results(self.settings.max_history) {
                self.history = results;
            }
        }
    }

    /// Persist the most recent result to the shared history and refresh the list.
    ///
    /// Uses a single store handle for the write **and** the follow-up read, and
    /// surfaces failures on the status line instead of swallowing them. Saving
    /// the same result twice is harmless (identical timestamp key overwrites).
    fn persist_last_result(&mut self) {
        let Some(result) = self.result.clone() else {
            return;
        };
        match HistoryStorage::new() {
            Ok(store) => {
                if let Err(e) = store.save_result(&result) {
                    self.status = format!("Failed to save history: {e}").into();
                }
                if let Ok(results) = store.get_recent_results(self.settings.max_history) {
                    self.history = results;
                }
            }
            Err(e) => {
                self.status = format!("Failed to open history: {e}").into();
            }
        }
    }

    /// Toggle the "run a test on launch" preference and persist settings.
    pub fn toggle_auto_run(&mut self) {
        self.settings.auto_run = !self.settings.auto_run;
        let _ = self.settings.save();
    }

    /// Clear all saved history (and the on-screen list).
    pub fn clear_history(&mut self) {
        if let Ok(store) = HistoryStorage::new() {
            let _ = store.clear_history();
        }
        self.history.clear();
    }

    /// Rebuild the active [`TestConfig`] from settings and persist to JSON.
    fn apply_and_save_settings(&mut self) {
        self.config = self.settings.to_config();
        let _ = self.settings.save();
    }

    /// Cycle the test server through the built-in presets.
    pub fn cycle_server(&mut self) {
        let idx = SERVER_PRESETS
            .iter()
            .position(|s| *s == self.settings.server_url)
            .map(|i| (i + 1) % SERVER_PRESETS.len())
            .unwrap_or(0);
        self.settings.server_url = SERVER_PRESETS[idx].to_string();
        self.apply_and_save_settings();
    }

    /// Adjust the test payload size (MB), clamped to a sane range.
    pub fn adjust_size(&mut self, delta: i64) {
        let v = (self.settings.test_size_mb as i64 + delta).clamp(1, 1000);
        self.settings.test_size_mb = v as u64;
        self.apply_and_save_settings();
    }

    /// Adjust the per-test timeout (seconds), clamped to a sane range.
    pub fn adjust_timeout(&mut self, delta: i64) {
        let v = (self.settings.timeout_seconds as i64 + delta).clamp(5, 120);
        self.settings.timeout_seconds = v as u64;
        self.apply_and_save_settings();
    }

    /// Cycle the output detail level.
    pub fn cycle_detail(&mut self) {
        use netrunner_core::DetailLevel::*;
        self.settings.detail_level = match self.settings.detail_level {
            Basic => Standard,
            Standard => Detailed,
            Detailed => Debug,
            Debug => Basic,
        };
        self.apply_and_save_settings();
    }

    /// Kick off a full speed test and stream its progress into this entity.
    pub fn start(&mut self, cx: &mut Context<Self>) {
        if self.running {
            return;
        }

        // Reset state for a fresh run.
        self.running = true;
        self.phase = Phase::Locating;
        self.status = "Initialising neural interface…".into();
        self.download_samples.clear();
        self.upload_samples.clear();
        self.download_mbps = 0.0;
        self.upload_mbps = 0.0;
        self.peak_download = 0.0;
        self.peak_upload = 0.0;
        self.ping_ms = 0.0;
        self.location = None;
        self.isp = None;
        self.server = None;
        self.result = None;

        let rx = spawn_speed_test(self.config.clone());

        cx.spawn(async move |this, cx| {
            let mut rx = rx;
            while let Some(event) = rx.next().await {
                let keep_going = this
                    .update(cx, |app, cx| {
                        let completed = matches!(&event, TestEvent::Completed(_));
                        app.apply(event);
                        if completed {
                            // Save this run to the shared history (redb) and
                            // refresh the on-screen list.
                            app.persist_last_result();
                        }
                        cx.notify();
                    })
                    .is_ok();
                if !keep_going {
                    break;
                }
            }
            let _ = this.update(cx, |app, cx| {
                app.running = false;
                if app.phase != Phase::Done {
                    app.phase = Phase::Done;
                }
                // Safety net: guarantee the finished run is saved even if the
                // Completed event didn't persist it (idempotent — same key).
                if app.result.is_some() {
                    app.persist_last_result();
                }
                cx.notify();
            });
        })
        .detach();

        cx.notify();
    }

    /// Apply a single progress event to the state.
    pub fn apply(&mut self, event: TestEvent) {
        match event {
            TestEvent::Status(msg) => self.status = msg.into(),
            TestEvent::LocationDetected {
                city, country, isp, ..
            } => {
                self.location = Some(format!("{city}, {country}").into());
                self.isp = isp.map(Into::into);
                self.phase = Phase::Locating;
            }
            TestEvent::ServerPoolBuilt { .. } | TestEvent::NearbyServersFound { .. } => {
                self.phase = Phase::Servers;
            }
            TestEvent::ServersSelected { .. } => self.phase = Phase::Servers,
            TestEvent::PrimarySelected { name, location, .. } => {
                self.server = Some(format!("{name} · {location}").into());
                self.phase = Phase::Servers;
            }
            TestEvent::PhaseStarted(phase) => {
                use netrunner_core::Phase as CorePhase;
                self.phase = match phase {
                    CorePhase::Locating => Phase::Locating,
                    CorePhase::BuildingServers | CorePhase::SelectingServers => Phase::Servers,
                    CorePhase::Latency => Phase::Latency,
                    CorePhase::Download => Phase::Download,
                    CorePhase::Upload => Phase::Upload,
                    CorePhase::Jitter => self.phase,
                };
                self.status = phase.title().to_string().into();
            }
            TestEvent::DownloadSample {
                mbps, peak_mbps, ..
            } => {
                self.download_mbps = mbps as f32;
                self.peak_download = peak_mbps as f32;
                push_sample(&mut self.download_samples, mbps as f32);
            }
            TestEvent::UploadSample {
                mbps, peak_mbps, ..
            } => {
                self.upload_mbps = mbps as f32;
                self.peak_upload = peak_mbps as f32;
                push_sample(&mut self.upload_samples, mbps as f32);
            }
            TestEvent::DownloadComplete { mbps } => self.download_mbps = mbps as f32,
            TestEvent::UploadComplete { mbps } => self.upload_mbps = mbps as f32,
            TestEvent::LatencyProgress { avg_ms } | TestEvent::LatencyComplete { avg_ms } => {
                self.ping_ms = avg_ms as f32;
            }
            TestEvent::Completed(result) => {
                self.download_mbps = result.download_mbps as f32;
                self.upload_mbps = result.upload_mbps as f32;
                self.ping_ms = result.ping_ms as f32;
                self.phase = Phase::Done;
                self.status = "Test complete.".into();
                self.result = Some(*result);
            }
            TestEvent::JitterComplete { .. } | TestEvent::DiagnosticsComplete(_) => {}
        }
    }
}

impl Default for SpeedApp {
    fn default() -> Self {
        Self::new()
    }
}

fn push_sample(buf: &mut Vec<f32>, value: f32) {
    buf.push(value);
    if buf.len() > MAX_SAMPLES {
        let overflow = buf.len() - MAX_SAMPLES;
        buf.drain(0..overflow);
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use netrunner_core::Phase as CorePhase;

    #[test]
    fn apply_download_sample_tracks_current_and_peak() {
        let mut app = SpeedApp::new();
        app.apply(TestEvent::PhaseStarted(CorePhase::Download));
        assert_eq!(app.phase, Phase::Download);

        app.apply(TestEvent::DownloadSample {
            mbps: 120.0,
            peak_mbps: 120.0,
            elapsed_secs: 1.0,
        });
        app.apply(TestEvent::DownloadSample {
            mbps: 80.0,
            peak_mbps: 120.0,
            elapsed_secs: 2.0,
        });

        assert_eq!(app.download_samples.len(), 2);
        assert_eq!(app.download_mbps, 80.0);
        assert_eq!(app.peak_download, 120.0);
    }

    #[test]
    fn sample_buffer_is_capped() {
        let mut app = SpeedApp::new();
        for i in 0..(MAX_SAMPLES + 50) {
            app.apply(TestEvent::UploadSample {
                mbps: i as f64,
                peak_mbps: i as f64,
                elapsed_secs: 0.0,
            });
        }
        assert_eq!(app.upload_samples.len(), MAX_SAMPLES);
        // Oldest samples were dropped, newest retained.
        assert_eq!(
            *app.upload_samples.last().unwrap(),
            (MAX_SAMPLES + 49) as f32
        );
    }

    #[test]
    fn completed_populates_result_and_metrics() {
        let mut app = SpeedApp::new();
        let result = netrunner_core::SpeedTestResult {
            download_mbps: 250.0,
            upload_mbps: 40.0,
            ping_ms: 12.0,
            ..Default::default()
        };

        app.apply(TestEvent::Completed(Box::new(result)));

        assert_eq!(app.phase, Phase::Done);
        assert!(app.result.is_some());
        assert_eq!(app.download_mbps, 250.0);
        assert_eq!(app.upload_mbps, 40.0);
        assert_eq!(app.ping_ms, 12.0);
    }

    #[test]
    fn location_event_is_formatted() {
        let mut app = SpeedApp::new();
        app.apply(TestEvent::LocationDetected {
            city: "Berlin".into(),
            country: "Germany".into(),
            isp: Some("Example ISP".into()),
            source: "ipapi.co".into(),
        });
        assert_eq!(
            app.location.as_ref().map(|s| s.to_string()),
            Some("Berlin, Germany".to_string())
        );
        assert_eq!(
            app.isp.as_ref().map(|s| s.to_string()),
            Some("Example ISP".to_string())
        );
    }

    #[test]
    fn completed_run_is_persisted_and_reloaded() {
        // Point the config dir at a throwaway HOME so we don't touch real data.
        let tmp = std::env::temp_dir().join(format!("nr_gui_persist_{}", std::process::id()));
        let _ = std::fs::remove_dir_all(&tmp);
        std::fs::create_dir_all(&tmp).unwrap();
        std::env::set_var("HOME", &tmp);
        std::env::set_var("XDG_CONFIG_HOME", tmp.join(".config"));

        let mut app = SpeedApp::new();
        app.reload_history();
        assert_eq!(app.history.len(), 0, "fresh HOME should have empty history");

        app.result = Some(netrunner_core::SpeedTestResult {
            download_mbps: 100.0,
            upload_mbps: 20.0,
            ping_ms: 5.0,
            ..Default::default()
        });
        app.persist_last_result();

        assert_eq!(app.history.len(), 1, "run should be saved and reloaded");
        assert_eq!(app.history[0].download_mbps, 100.0);

        let _ = std::fs::remove_dir_all(&tmp);
    }
}