use serde::{Deserialize, Serialize};

use super::devices::DeviceCatalog;
use lesavka_common::eye_source::{
    EyeSourceMode, default_eye_source_mode, display_size_for_source_mode, native_eye_source_modes,
};

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum InputRouting {
    Local,
    Remote,
}

impl InputRouting {
    pub fn as_env(self) -> &'static str {
        match self {
            Self::Local => "0",
            Self::Remote => "1",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ViewMode {
    Unified,
    Breakout,
}

impl ViewMode {
    pub fn as_env(self) -> &'static str {
        match self {
            Self::Unified => "unified",
            Self::Breakout => "breakout",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DisplaySurface {
    Preview,
    Window,
}

impl DisplaySurface {
    pub fn label(self) -> &'static str {
        match self {
            Self::Preview => "preview",
            Self::Window => "window",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum FeedSourcePreset {
    ThisEye,
    OtherEye,
    Off,
}

impl FeedSourcePreset {
    pub fn as_id(self) -> &'static str {
        match self {
            Self::ThisEye => "self",
            Self::OtherEye => "other",
            Self::Off => "off",
        }
    }

    pub fn from_id(raw: &str) -> Option<Self> {
        match raw {
            "self" => Some(Self::ThisEye),
            "other" => Some(Self::OtherEye),
            "off" => Some(Self::Off),
            _ => None,
        }
    }

    pub fn label(self, monitor_id: usize) -> &'static str {
        match (monitor_id, self) {
            (_, Self::Off) => "Off",
            (0, Self::ThisEye) => "Left Eye",
            (0, Self::OtherEye) => "Right Eye",
            (1, Self::ThisEye) => "Right Eye",
            (1, Self::OtherEye) => "Left Eye",
            _ => "This Eye",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum BreakoutSizePreset {
    P360,
    P540,
    P720,
    P900,
    P1080,
    P1440,
    Source,
    FillDisplay,
}

impl BreakoutSizePreset {
    pub fn as_id(self) -> &'static str {
        match self {
            Self::P360 => "360p",
            Self::P540 => "540p",
            Self::P720 => "720p",
            Self::P900 => "900p",
            Self::P1080 => "1080p",
            Self::P1440 => "1440p",
            Self::Source => "source",
            Self::FillDisplay => "fill",
        }
    }

    pub fn from_id(raw: &str) -> Option<Self> {
        match raw {
            "360p" => Some(Self::P360),
            "540p" => Some(Self::P540),
            "720p" => Some(Self::P720),
            "900p" => Some(Self::P900),
            "1080p" => Some(Self::P1080),
            "1440p" => Some(Self::P1440),
            "source" => Some(Self::Source),
            "fill" => Some(Self::FillDisplay),
            _ => None,
        }
    }

    pub fn label(self) -> &'static str {
        match self {
            Self::P360 => "360p",
            Self::P540 => "540p",
            Self::P720 => "720p",
            Self::P900 => "900p",
            Self::P1080 => "1080p",
            Self::P1440 => "1440p",
            Self::Source => "Source",
            Self::FillDisplay => "Display",
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum CaptureSizePreset {
    #[serde(alias = "P360")]
    Vga,
    #[serde(alias = "P540")]
    P480,
    P576,
    P720,
    #[serde(alias = "P900", alias = "P1440", alias = "Source")]
    P1080,
}

impl CaptureSizePreset {
    pub fn as_id(self) -> &'static str {
        match self {
            Self::Vga => "vga",
            Self::P480 => "480p",
            Self::P576 => "576p",
            Self::P720 => "720p",
            Self::P1080 => "1080p",
        }
    }

    pub fn from_id(raw: &str) -> Option<Self> {
        match raw {
            "vga" | "360p" => Some(Self::Vga),
            "480p" | "540p" => Some(Self::P480),
            "576p" => Some(Self::P576),
            "720p" => Some(Self::P720),
            "900p" | "1080p" | "1440p" | "source" => Some(Self::P1080),
            _ => None,
        }
    }

    pub fn label(self) -> &'static str {
        match self {
            Self::Vga => "VGA",
            Self::P480 => "480p",
            Self::P576 => "576p",
            Self::P720 => "720p",
            Self::P1080 => "1080p",
        }
    }

    pub fn transport_label(self) -> &'static str {
        "device H.264 pass-through"
    }

    pub fn source_mode(self) -> EyeSourceMode {
        match normalize_capture_size_preset(self) {
            Self::P720 => native_eye_source_modes()[1],
            Self::P1080 => native_eye_source_modes()[0],
            Self::Vga | Self::P480 | Self::P576 => native_eye_source_modes()[1],
        }
    }

    pub fn from_source_mode(mode: EyeSourceMode) -> Self {
        match (mode.width, mode.height, mode.fps) {
            (1280, 720, 60) => Self::P720,
            _ => Self::P1080,
        }
    }

    pub fn display_size(self) -> (u32, u32) {
        display_size_for_source_mode(self.source_mode())
    }

    pub fn display_aspect_ratio(self) -> f32 {
        let (width, height) = self.display_size();
        width.max(1) as f32 / height.max(1) as f32
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub struct PreviewSourceSize {
    pub width: u32,
    pub height: u32,
    pub fps: u32,
}

impl Default for PreviewSourceSize {
    fn default() -> Self {
        let mode = default_eye_source_mode();
        Self {
            width: mode.width,
            height: mode.height,
            fps: mode.fps,
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct BreakoutSizeChoice {
    pub preset: BreakoutSizePreset,
    pub width: i32,
    pub height: i32,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct CaptureSizeChoice {
    pub preset: CaptureSizePreset,
    pub width: i32,
    pub height: i32,
    pub fps: u32,
    pub max_bitrate_kbit: u32,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct FeedSourceChoice {
    pub preset: FeedSourcePreset,
    pub label: &'static str,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct CaptureFpsChoice {
    pub fps: u32,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct CaptureBitrateChoice {
    pub max_bitrate_kbit: u32,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct CapturePowerStatus {
    pub available: bool,
    pub enabled: bool,
    pub unit: String,
    pub detail: String,
    pub active_leases: u32,
    pub mode: String,
    pub detected_devices: u32,
}

impl Default for CapturePowerStatus {
    fn default() -> Self {
        Self {
            available: false,
            enabled: false,
            unit: "relay.service".to_string(),
            detail: "unknown".to_string(),
            active_leases: 0,
            mode: "auto".to_string(),
            detected_devices: 0,
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize, Deserialize)]
pub struct DeviceSelection {
    pub camera: Option<String>,
    pub microphone: Option<String>,
    pub speaker: Option<String>,
    pub keyboard: Option<String>,
    pub mouse: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LauncherState {
    pub server_available: bool,
    pub server_version: Option<String>,
    pub routing: InputRouting,
    pub view_mode: ViewMode,
    pub displays: [DisplaySurface; 2],
    pub feed_sources: [FeedSourcePreset; 2],
    pub preview_source: PreviewSourceSize,
    pub breakout_limit: PreviewSourceSize,
    pub breakout_display: PreviewSourceSize,
    pub capture_sizes: [CaptureSizePreset; 2],
    pub capture_fps: [u32; 2],
    pub capture_bitrates_kbit: [u32; 2],
    pub breakout_sizes: [BreakoutSizePreset; 2],
    pub devices: DeviceSelection,
    pub swap_key: String,
    pub swap_key_binding: bool,
    pub swap_key_binding_token: u64,
    pub capture_power: CapturePowerStatus,
    pub remote_active: bool,
    pub notes: Vec<String>,
}

impl Default for LauncherState {
    fn default() -> Self {
        Self {
            server_available: false,
            server_version: None,
            routing: InputRouting::Remote,
            view_mode: ViewMode::Unified,
            displays: [DisplaySurface::Preview, DisplaySurface::Preview],
            feed_sources: [FeedSourcePreset::ThisEye, FeedSourcePreset::ThisEye],
            preview_source: PreviewSourceSize::default(),
            breakout_limit: PreviewSourceSize::default(),
            breakout_display: PreviewSourceSize::default(),
            capture_sizes: [CaptureSizePreset::P1080, CaptureSizePreset::P1080],
            capture_fps: [60, 60],
            capture_bitrates_kbit: [18_000, 18_000],
            breakout_sizes: [BreakoutSizePreset::Source, BreakoutSizePreset::Source],
            devices: DeviceSelection::default(),
            swap_key: "pause".to_string(),
            swap_key_binding: false,
            swap_key_binding_token: 0,
            capture_power: CapturePowerStatus::default(),
            remote_active: false,
            notes: Vec::new(),
        }
    }
}

impl LauncherState {
    pub fn new() -> Self {
        Self::default()
    }

    pub fn set_routing(&mut self, routing: InputRouting) {
        self.routing = routing;
    }

    pub fn set_server_available(&mut self, available: bool) {
        self.server_available = available;
    }

    pub fn set_server_version(&mut self, version: Option<String>) {
        self.server_version = version.and_then(|value| {
            let trimmed = value.trim();
            if trimmed.is_empty() {
                None
            } else {
                Some(trimmed.to_string())
            }
        });
    }

    pub fn set_view_mode(&mut self, view_mode: ViewMode) {
        self.view_mode = view_mode;
        self.displays = match view_mode {
            ViewMode::Unified => [DisplaySurface::Preview, DisplaySurface::Preview],
            ViewMode::Breakout => [DisplaySurface::Window, DisplaySurface::Window],
        };
    }

    pub fn display_surface(&self, monitor_id: usize) -> DisplaySurface {
        self.displays
            .get(monitor_id)
            .copied()
            .unwrap_or(DisplaySurface::Preview)
    }

    pub fn feed_source_preset(&self, monitor_id: usize) -> FeedSourcePreset {
        self.feed_sources
            .get(monitor_id)
            .copied()
            .unwrap_or(FeedSourcePreset::ThisEye)
    }

    pub fn set_feed_source_preset(&mut self, monitor_id: usize, preset: FeedSourcePreset) {
        if let Some(slot) = self.feed_sources.get_mut(monitor_id) {
            *slot = preset;
        }
    }

    pub fn feed_source_options(&self, monitor_id: usize) -> Vec<FeedSourceChoice> {
        vec![
            FeedSourceChoice {
                preset: FeedSourcePreset::ThisEye,
                label: FeedSourcePreset::ThisEye.label(monitor_id),
            },
            FeedSourceChoice {
                preset: FeedSourcePreset::OtherEye,
                label: FeedSourcePreset::OtherEye.label(monitor_id),
            },
            FeedSourceChoice {
                preset: FeedSourcePreset::Off,
                label: FeedSourcePreset::Off.label(monitor_id),
            },
        ]
    }

    pub fn resolved_feed_monitor_id(&self, monitor_id: usize) -> Option<usize> {
        match self.feed_source_preset(monitor_id) {
            FeedSourcePreset::ThisEye => Some(monitor_id.min(1)),
            FeedSourcePreset::OtherEye => Some(1_usize.saturating_sub(monitor_id.min(1))),
            FeedSourcePreset::Off => None,
        }
    }

    pub fn set_display_surface(&mut self, monitor_id: usize, surface: DisplaySurface) {
        if let Some(slot) = self.displays.get_mut(monitor_id) {
            *slot = surface;
            self.view_mode = if self
                .displays
                .iter()
                .any(|display| matches!(display, DisplaySurface::Window))
            {
                ViewMode::Breakout
            } else {
                ViewMode::Unified
            };
        }
    }

    pub fn breakout_count(&self) -> usize {
        self.displays
            .iter()
            .filter(|surface| matches!(surface, DisplaySurface::Window))
            .count()
    }

    pub fn preview_source_size(&self) -> PreviewSourceSize {
        self.preview_source
    }

    pub fn set_preview_source_profile(&mut self, width: u32, height: u32, fps: u32) {
        if width == 0 || height == 0 {
            return;
        }
        self.preview_source = PreviewSourceSize {
            width,
            height,
            fps: fps.max(1),
        };
    }

    pub fn breakout_limit_size(&self) -> PreviewSourceSize {
        self.breakout_limit
    }

    pub fn set_breakout_limit_size(&mut self, width: u32, height: u32) {
        if width == 0 || height == 0 {
            return;
        }
        self.breakout_limit = PreviewSourceSize {
            width,
            height,
            fps: self.breakout_limit.fps.max(1),
        };
    }

    pub fn breakout_display_size(&self) -> PreviewSourceSize {
        self.breakout_display
    }

    pub fn set_breakout_display_size(&mut self, width: u32, height: u32) {
        if width == 0 || height == 0 {
            return;
        }
        self.breakout_display = PreviewSourceSize {
            width,
            height,
            fps: self.breakout_display.fps.max(1),
        };
    }

    pub fn capture_size_preset(&self, monitor_id: usize) -> CaptureSizePreset {
        normalize_capture_size_preset(
            self.capture_sizes
                .get(monitor_id)
                .copied()
                .unwrap_or(CaptureSizePreset::P1080),
        )
    }

    pub fn display_capture_size_preset(&self, monitor_id: usize) -> Option<CaptureSizePreset> {
        self.resolved_feed_monitor_id(monitor_id)
            .map(|source_id| self.capture_size_preset(source_id))
    }

    pub fn set_capture_size_preset(&mut self, monitor_id: usize, preset: CaptureSizePreset) {
        let preset = normalize_capture_size_preset(preset);
        if let Some(slot) = self.capture_sizes.get_mut(monitor_id) {
            *slot = preset;
        }
        let defaults = default_profile_for_preset(self.preview_source, preset);
        self.set_capture_fps(monitor_id, defaults.fps);
        self.set_capture_bitrate_kbit(monitor_id, defaults.max_bitrate_kbit);
    }

    pub fn capture_fps(&self, monitor_id: usize) -> u32 {
        self.capture_fps
            .get(monitor_id)
            .copied()
            .unwrap_or(default_eye_source_mode().fps)
            .max(1)
    }

    pub fn display_capture_fps(&self, monitor_id: usize) -> Option<u32> {
        self.resolved_feed_monitor_id(monitor_id)
            .map(|source_id| self.capture_fps(source_id))
    }

    pub fn set_capture_fps(&mut self, monitor_id: usize, fps: u32) {
        if let Some(slot) = self.capture_fps.get_mut(monitor_id) {
            *slot = fps.max(1);
        }
    }

    pub fn capture_bitrate_kbit(&self, monitor_id: usize) -> u32 {
        self.capture_bitrates_kbit
            .get(monitor_id)
            .copied()
            .unwrap_or(estimate_source_bitrate_kbit(
                default_eye_source_mode().width as i32,
                default_eye_source_mode().height as i32,
                default_eye_source_mode().fps,
            ))
            .max(800)
    }

    pub fn display_capture_bitrate_kbit(&self, monitor_id: usize) -> Option<u32> {
        self.resolved_feed_monitor_id(monitor_id)
            .map(|source_id| self.capture_bitrate_kbit(source_id))
    }

    pub fn set_capture_bitrate_kbit(&mut self, monitor_id: usize, max_bitrate_kbit: u32) {
        if let Some(slot) = self.capture_bitrates_kbit.get_mut(monitor_id) {
            *slot = max_bitrate_kbit.max(800);
        }
    }

    pub fn capture_size_choice(&self, monitor_id: usize) -> CaptureSizeChoice {
        capture_size_choice(
            self.preview_source,
            self.capture_size_preset(monitor_id),
            self.capture_fps(monitor_id),
            self.capture_bitrate_kbit(monitor_id),
        )
    }

    pub fn display_capture_size_choice(&self, monitor_id: usize) -> Option<CaptureSizeChoice> {
        self.resolved_feed_monitor_id(monitor_id)
            .map(|source_id| self.capture_size_choice(source_id))
    }

    pub fn effective_preview_source_size(&self, monitor_id: usize) -> PreviewSourceSize {
        let capture = self
            .display_capture_size_choice(monitor_id)
            .unwrap_or_else(|| self.capture_size_choice(monitor_id));
        PreviewSourceSize {
            width: capture.width.max(1) as u32,
            height: capture.height.max(1) as u32,
            fps: capture.fps.max(1),
        }
    }

    pub fn capture_size_options(&self) -> Vec<CaptureSizeChoice> {
        capture_size_options(self.preview_source)
    }

    pub fn capture_fps_options(&self) -> Vec<CaptureFpsChoice> {
        capture_fps_options(self.preview_source)
    }

    pub fn capture_bitrate_options(&self) -> Vec<CaptureBitrateChoice> {
        capture_bitrate_options(self.preview_source)
    }

    pub fn breakout_size_preset(&self, monitor_id: usize) -> BreakoutSizePreset {
        self.breakout_sizes
            .get(monitor_id)
            .copied()
            .unwrap_or(BreakoutSizePreset::Source)
    }

    pub fn set_breakout_size_preset(&mut self, monitor_id: usize, preset: BreakoutSizePreset) {
        if let Some(slot) = self.breakout_sizes.get_mut(monitor_id) {
            *slot = preset;
        }
    }

    pub fn breakout_size_choice(&self, monitor_id: usize) -> BreakoutSizeChoice {
        breakout_size_choice(
            self.breakout_limit,
            self.breakout_display,
            self.effective_preview_source_size(monitor_id),
            self.breakout_size_preset(monitor_id),
        )
    }

    pub fn breakout_size_options(&self, monitor_id: usize) -> Vec<BreakoutSizeChoice> {
        breakout_size_options(
            self.breakout_limit,
            self.breakout_display,
            self.effective_preview_source_size(monitor_id),
        )
    }

    pub fn select_camera(&mut self, camera: Option<String>) {
        self.devices.camera = normalize_selection(camera);
    }

    pub fn select_microphone(&mut self, microphone: Option<String>) {
        self.devices.microphone = normalize_selection(microphone);
    }

    pub fn select_speaker(&mut self, speaker: Option<String>) {
        self.devices.speaker = normalize_selection(speaker);
    }

    pub fn select_keyboard(&mut self, keyboard: Option<String>) {
        self.devices.keyboard = normalize_selection(keyboard);
    }

    pub fn select_mouse(&mut self, mouse: Option<String>) {
        self.devices.mouse = normalize_selection(mouse);
    }

    pub fn apply_catalog_defaults(&mut self, catalog: &DeviceCatalog) {
        let _ = catalog;
    }

    pub fn set_swap_key(&mut self, swap_key: impl Into<String>) {
        self.swap_key = normalize_swap_key(swap_key.into());
    }

    pub fn begin_swap_key_binding(&mut self) -> u64 {
        self.swap_key_binding = true;
        self.swap_key_binding_token = self.swap_key_binding_token.wrapping_add(1);
        self.swap_key_binding_token
    }

    pub fn finish_swap_key_binding(&mut self) {
        self.swap_key_binding = false;
    }

    pub fn cancel_swap_key_binding(&mut self, token: u64) -> bool {
        if self.swap_key_binding && self.swap_key_binding_token == token {
            self.swap_key_binding = false;
            true
        } else {
            false
        }
    }

    pub fn complete_swap_key_binding(&mut self, swap_key: impl Into<String>) {
        self.set_swap_key(swap_key);
        self.finish_swap_key_binding();
    }

    pub fn start_remote(&mut self) -> bool {
        if self.remote_active {
            return false;
        }
        self.remote_active = true;
        true
    }

    pub fn stop_remote(&mut self) -> bool {
        if !self.remote_active {
            return false;
        }
        self.remote_active = false;
        true
    }

    pub fn push_note(&mut self, note: impl Into<String>) {
        self.notes.push(note.into());
    }

    pub fn set_capture_power(&mut self, power: CapturePowerStatus) {
        self.capture_power = power;
    }

    pub fn status_line(&self) -> String {
        format!(
            "server={} mode={} view={} active={} power={} source={}x{} d1={} d2={} s1={} s2={} camera={} mic={} speaker={} kbd={} mouse={} swap={}",
            self.server_available,
            match self.routing {
                InputRouting::Local => "local",
                InputRouting::Remote => "remote",
            },
            match self.view_mode {
                ViewMode::Unified => "unified",
                ViewMode::Breakout => "breakout",
            },
            self.remote_active,
            if self.capture_power.enabled {
                "on"
            } else {
                "off"
            },
            self.preview_source.width,
            self.preview_source.height,
            self.displays[0].label(),
            self.displays[1].label(),
            self.feed_source_preset(0).as_id(),
            self.feed_source_preset(1).as_id(),
            self.devices.camera.as_deref().unwrap_or("auto"),
            self.devices.microphone.as_deref().unwrap_or("auto"),
            self.devices.speaker.as_deref().unwrap_or("auto"),
            self.devices.keyboard.as_deref().unwrap_or("all"),
            self.devices.mouse.as_deref().unwrap_or("all"),
            self.swap_key,
        )
    }
}

fn breakout_size_choice(
    physical_limit: PreviewSourceSize,
    display_fill: PreviewSourceSize,
    source: PreviewSourceSize,
    preset: BreakoutSizePreset,
) -> BreakoutSizeChoice {
    let physical_width = physical_limit.width.max(1) as i32;
    let physical_height = physical_limit.height.max(1) as i32;
    let display_width = display_fill.width.max(1) as i32;
    let display_height = display_fill.height.max(1) as i32;
    let (width, height) = match preset {
        BreakoutSizePreset::P360 => {
            fit_standard_dimensions(physical_width, physical_height, 640, 360)
        }
        BreakoutSizePreset::P540 => {
            fit_standard_dimensions(physical_width, physical_height, 960, 540)
        }
        BreakoutSizePreset::P720 => {
            fit_standard_dimensions(physical_width, physical_height, 1280, 720)
        }
        BreakoutSizePreset::P900 => {
            fit_standard_dimensions(physical_width, physical_height, 1600, 900)
        }
        BreakoutSizePreset::P1080 => {
            fit_standard_dimensions(physical_width, physical_height, 1920, 1080)
        }
        BreakoutSizePreset::P1440 => {
            fit_standard_dimensions(physical_width, physical_height, 2560, 1440)
        }
        BreakoutSizePreset::Source => fit_standard_dimensions(
            physical_width,
            physical_height,
            source.width.max(1) as i32,
            source.height.max(1) as i32,
        ),
        BreakoutSizePreset::FillDisplay => (display_width, display_height),
    };
    BreakoutSizeChoice {
        preset,
        width,
        height,
    }
}

fn breakout_size_options(
    physical_limit: PreviewSourceSize,
    display_fill: PreviewSourceSize,
    source: PreviewSourceSize,
) -> Vec<BreakoutSizeChoice> {
    let mut options = Vec::new();
    for preset in [
        BreakoutSizePreset::Source,
        BreakoutSizePreset::P360,
        BreakoutSizePreset::P540,
        BreakoutSizePreset::P720,
        BreakoutSizePreset::P900,
        BreakoutSizePreset::P1080,
        BreakoutSizePreset::P1440,
        BreakoutSizePreset::FillDisplay,
    ] {
        let choice = breakout_size_choice(physical_limit, display_fill, source, preset);
        let allow_duplicate_label = matches!(
            preset,
            BreakoutSizePreset::Source | BreakoutSizePreset::FillDisplay
        );
        if !allow_duplicate_label
            && options.iter().any(|existing: &BreakoutSizeChoice| {
                existing.width == choice.width && existing.height == choice.height
            })
        {
            continue;
        }
        options.push(choice);
    }
    options
}

fn capture_size_choice(
    _source: PreviewSourceSize,
    preset: CaptureSizePreset,
    selected_fps: u32,
    selected_bitrate_kbit: u32,
) -> CaptureSizeChoice {
    let preset = normalize_capture_size_preset(preset);
    let mode = preset.source_mode();
    let _ = (selected_fps, selected_bitrate_kbit);
    let (width, height, fps, max_bitrate_kbit) = (
        mode.width as i32,
        mode.height as i32,
        mode.fps,
        estimate_source_bitrate_kbit(mode.width as i32, mode.height as i32, mode.fps),
    );
    CaptureSizeChoice {
        preset,
        width,
        height,
        fps,
        max_bitrate_kbit,
    }
}

fn estimate_source_bitrate_kbit(width: i32, height: i32, fps: u32) -> u32 {
    let pixels_per_second = width.max(1) as u64 * height.max(1) as u64 * fps.max(1) as u64;
    match pixels_per_second {
        p if p >= 1920_u64 * 1080 * 50 => 18_000,
        p if p >= 1920_u64 * 1080 * 24 => 12_000,
        p if p >= 1280_u64 * 720 * 24 => 6_000,
        _ => 2_500,
    }
}

fn capture_size_options(source: PreviewSourceSize) -> Vec<CaptureSizeChoice> {
    native_eye_source_modes()
        .iter()
        .copied()
        .filter(|mode| mode.width <= source.width && mode.height <= source.height)
        .map(CaptureSizePreset::from_source_mode)
        .map(|preset| {
            let defaults = default_profile_for_preset(source, preset);
            capture_size_choice(source, preset, defaults.fps, defaults.max_bitrate_kbit)
        })
        .collect()
}

fn capture_fps_options(source: PreviewSourceSize) -> Vec<CaptureFpsChoice> {
    vec![CaptureFpsChoice {
        fps: source.fps.max(1),
    }]
}

fn capture_bitrate_options(source: PreviewSourceSize) -> Vec<CaptureBitrateChoice> {
    vec![CaptureBitrateChoice {
        max_bitrate_kbit: estimate_source_bitrate_kbit(
            source.width as i32,
            source.height as i32,
            source.fps,
        ),
    }]
}

fn default_profile_for_preset(
    _source: PreviewSourceSize,
    preset: CaptureSizePreset,
) -> CaptureSizeChoice {
    let preset = normalize_capture_size_preset(preset);
    let mode = preset.source_mode();
    let (width, height, fps, max_bitrate_kbit) = (
        mode.width as i32,
        mode.height as i32,
        mode.fps,
        estimate_source_bitrate_kbit(mode.width as i32, mode.height as i32, mode.fps),
    );
    CaptureSizeChoice {
        preset,
        width,
        height,
        fps,
        max_bitrate_kbit,
    }
}

fn normalize_capture_size_preset(preset: CaptureSizePreset) -> CaptureSizePreset {
    match preset {
        CaptureSizePreset::Vga | CaptureSizePreset::P480 | CaptureSizePreset::P576 => {
            CaptureSizePreset::P720
        }
        other => other,
    }
}

fn fit_standard_dimensions(
    limit_width: i32,
    limit_height: i32,
    wanted_width: i32,
    wanted_height: i32,
) -> (i32, i32) {
    let width = wanted_width.min(limit_width).max(2);
    let height = wanted_height.min(limit_height).max(2);
    if width == limit_width && height == limit_height {
        return (width, height);
    }
    let width_from_height = round_down_even((height * 16) / 9);
    if width_from_height <= limit_width {
        (round_down_even(width_from_height), round_down_even(height))
    } else {
        let height_from_width = round_down_even((width * 9) / 16);
        (round_down_even(width), round_down_even(height_from_width))
    }
}

fn round_down_even(value: i32) -> i32 {
    let rounded = value.max(2);
    rounded - (rounded % 2)
}

fn normalize_selection(value: Option<String>) -> Option<String> {
    value.and_then(|v| {
        let trimmed = v.trim();
        if trimmed.is_empty() || trimmed.eq_ignore_ascii_case("auto") {
            None
        } else {
            Some(trimmed.to_string())
        }
    })
}

fn normalize_swap_key(value: String) -> String {
    let trimmed = value.trim();
    if trimmed.is_empty() {
        "off".to_string()
    } else {
        trimmed.to_ascii_lowercase()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn routing_and_view_env_values_are_stable() {
        assert_eq!(InputRouting::Local.as_env(), "0");
        assert_eq!(InputRouting::Remote.as_env(), "1");
        assert_eq!(ViewMode::Unified.as_env(), "unified");
        assert_eq!(ViewMode::Breakout.as_env(), "breakout");
    }

    #[test]
    fn defaults_pick_remote_unified_and_inactive_session() {
        let state = LauncherState::new();
        assert_eq!(state.routing, InputRouting::Remote);
        assert_eq!(state.view_mode, ViewMode::Unified);
        assert_eq!(state.display_surface(0), DisplaySurface::Preview);
        assert_eq!(state.display_surface(1), DisplaySurface::Preview);
        assert_eq!(state.preview_source_size(), PreviewSourceSize::default());
        assert_eq!(state.breakout_limit_size(), PreviewSourceSize::default());
        assert_eq!(state.capture_size_preset(0), CaptureSizePreset::P1080);
        assert_eq!(state.breakout_size_preset(0), BreakoutSizePreset::Source);
        assert!(!state.server_available);
        assert!(!state.remote_active);
        assert!(state.devices.camera.is_none());
        assert!(state.devices.microphone.is_none());
        assert!(state.devices.speaker.is_none());
        assert!(state.devices.keyboard.is_none());
        assert!(state.devices.mouse.is_none());
        assert_eq!(state.capture_power.unit, "relay.service");
        assert_eq!(state.capture_power.mode, "auto");
    }

    #[test]
    fn display_surface_updates_global_view_summary() {
        let mut state = LauncherState::new();
        state.set_display_surface(1, DisplaySurface::Window);
        assert_eq!(state.view_mode, ViewMode::Breakout);
        assert_eq!(state.breakout_count(), 1);

        state.set_display_surface(1, DisplaySurface::Preview);
        assert_eq!(state.view_mode, ViewMode::Unified);
        assert_eq!(state.breakout_count(), 0);

        state.set_view_mode(ViewMode::Breakout);
        assert_eq!(state.display_surface(0), DisplaySurface::Window);
        assert_eq!(state.display_surface(1), DisplaySurface::Window);
    }

    #[test]
    fn feed_sources_can_mirror_or_disable_a_pane() {
        let mut state = LauncherState::new();
        state.set_capture_size_preset(1, CaptureSizePreset::P1080);

        assert_eq!(state.resolved_feed_monitor_id(0), Some(0));
        assert_eq!(state.resolved_feed_monitor_id(1), Some(1));

        state.set_feed_source_preset(0, FeedSourcePreset::OtherEye);
        assert_eq!(state.resolved_feed_monitor_id(0), Some(1));
        assert_eq!(
            state.display_capture_size_choice(0),
            Some(state.capture_size_choice(1))
        );

        state.set_feed_source_preset(1, FeedSourcePreset::OtherEye);
        assert_eq!(state.resolved_feed_monitor_id(1), Some(0));

        state.set_feed_source_preset(0, FeedSourcePreset::Off);
        assert_eq!(state.resolved_feed_monitor_id(0), None);
        assert!(state.display_capture_size_choice(0).is_none());
    }

    #[test]
    fn mirrored_panes_use_their_effective_source_size_for_breakout_source_labels() {
        let mut state = LauncherState::new();
        state.set_capture_size_preset(1, CaptureSizePreset::P720);
        state.set_feed_source_preset(0, FeedSourcePreset::OtherEye);

        let mirrored_source = state.effective_preview_source_size(0);
        assert_eq!(mirrored_source.width, 1280);
        assert_eq!(mirrored_source.height, 720);
        assert_eq!(mirrored_source.fps, 60);

        let mirrored_breakout = state.breakout_size_choice(0);
        assert_eq!(mirrored_breakout.preset, BreakoutSizePreset::Source);
        assert_eq!(mirrored_breakout.width, 1280);
        assert_eq!(mirrored_breakout.height, 720);
    }

    #[test]
    fn selecting_auto_or_blank_clears_explicit_device() {
        let mut state = LauncherState::new();
        state.select_camera(Some("/dev/video0".to_string()));
        assert_eq!(state.devices.camera.as_deref(), Some("/dev/video0"));

        state.select_camera(Some("auto".to_string()));
        assert!(state.devices.camera.is_none());

        state.select_microphone(Some("   ".to_string()));
        assert!(state.devices.microphone.is_none());
    }

    #[test]
    fn catalog_defaults_do_not_auto_stage_media_devices() {
        let mut state = LauncherState::new();
        state.select_camera(Some("/dev/video-special".to_string()));

        let catalog = DeviceCatalog {
            cameras: vec!["/dev/video0".to_string()],
            microphones: vec!["alsa_input.usb".to_string()],
            speakers: vec!["alsa_output.usb".to_string()],
            keyboards: vec!["/dev/input/event10".to_string()],
            mice: vec!["/dev/input/event11".to_string()],
        };

        state.apply_catalog_defaults(&catalog);

        assert_eq!(state.devices.camera.as_deref(), Some("/dev/video-special"));
        assert!(state.devices.microphone.is_none());
        assert!(state.devices.speaker.is_none());

        let mut fresh = LauncherState::new();
        fresh.apply_catalog_defaults(&catalog);
        assert!(fresh.devices.camera.is_none());
        assert!(fresh.devices.microphone.is_none());
        assert!(fresh.devices.speaker.is_none());
    }

    #[test]
    fn start_and_stop_remote_only_report_changes_once() {
        let mut state = LauncherState::new();
        assert!(state.start_remote());
        assert!(!state.start_remote());
        assert!(state.remote_active);

        assert!(state.stop_remote());
        assert!(!state.stop_remote());
        assert!(!state.remote_active);
    }

    #[test]
    fn status_line_mentions_all_user_visible_controls() {
        let mut state = LauncherState::new();
        state.set_server_available(true);
        state.set_routing(InputRouting::Local);
        state.set_view_mode(ViewMode::Unified);
        state.select_camera(Some("/dev/video0".to_string()));
        state.select_microphone(Some("alsa_input.usb".to_string()));
        state.select_speaker(Some("alsa_output.usb".to_string()));
        state.select_keyboard(Some("/dev/input/event-kbd".to_string()));
        state.select_mouse(Some("/dev/input/event-mouse".to_string()));
        state.set_preview_source_profile(1920, 1080, 30);
        state.start_remote();

        let status = state.status_line();
        assert!(status.contains("mode=local"));
        assert!(status.contains("server=true"));
        assert!(status.contains("view=unified"));
        assert!(status.contains("active=true"));
        assert!(status.contains("source=1920x1080"));
        assert!(status.contains("d1=preview"));
        assert!(status.contains("d2=preview"));
        assert!(status.contains("camera=/dev/video0"));
        assert!(status.contains("mic=alsa_input.usb"));
        assert!(status.contains("speaker=alsa_output.usb"));
        assert!(status.contains("kbd=/dev/input/event-kbd"));
        assert!(status.contains("mouse=/dev/input/event-mouse"));
    }

    #[test]
    fn capture_power_status_updates_snapshot_state() {
        let mut state = LauncherState::new();
        state.set_capture_power(CapturePowerStatus {
            available: true,
            enabled: true,
            unit: "relay.service".to_string(),
            detail: "active/running".to_string(),
            active_leases: 2,
            mode: "forced-on".to_string(),
            detected_devices: 2,
        });

        assert!(state.capture_power.available);
        assert!(state.capture_power.enabled);
        assert_eq!(state.capture_power.active_leases, 2);
        assert!(state.status_line().contains("power=on"));
    }

    #[test]
    fn server_availability_tracks_reachability() {
        let mut state = LauncherState::new();
        assert!(!state.server_available);
        state.set_server_available(true);
        assert!(state.server_available);
    }

    #[test]
    fn breakout_size_choices_track_the_negotiated_source_size() {
        let mut state = LauncherState::new();
        state.set_preview_source_profile(1920, 1080, 60);
        state.set_breakout_limit_size(2560, 1440);

        let source = state.capture_size_choice(0);
        assert_eq!(source.width, 1920);
        assert_eq!(source.height, 1080);
        assert_eq!(source.fps, 60);
        assert_eq!(source.max_bitrate_kbit, 18_000);

        state.set_capture_size_preset(0, CaptureSizePreset::P480);
        let compact_capture = state.capture_size_choice(0);
        assert_eq!(compact_capture.preset, CaptureSizePreset::P720);
        assert_eq!(compact_capture.width, 1280);
        assert_eq!(compact_capture.height, 720);
        assert_eq!(compact_capture.fps, 60);
        assert_eq!(compact_capture.max_bitrate_kbit, 12_000);

        let effective_source = state.effective_preview_source_size(0);
        assert_eq!(effective_source.width, 1280);
        assert_eq!(effective_source.height, 720);
        assert_eq!(effective_source.fps, 60);

        let display = state.breakout_size_choice(0);
        assert_eq!(display.width, 1280);
        assert_eq!(display.height, 720);

        state.set_breakout_size_preset(0, BreakoutSizePreset::P360);
        let smaller = state.breakout_size_choice(0);
        assert_eq!(smaller.width, 640);
        assert_eq!(smaller.height, 360);

        state.set_breakout_size_preset(0, BreakoutSizePreset::P540);
        let compact = state.breakout_size_choice(0);
        assert_eq!(compact.width, 960);
        assert_eq!(compact.height, 540);

        let capture_options = state.capture_size_options();
        assert_eq!(capture_options.len(), 2);
        assert_eq!(capture_options[0].preset, CaptureSizePreset::P1080);
        assert_eq!(capture_options[0].width, 1920);
        assert_eq!(capture_options[0].height, 1080);
        assert_eq!(capture_options[0].fps, 60);
        assert_eq!(capture_options[0].max_bitrate_kbit, 18_000);

        let breakout_options = state.breakout_size_options(0);
        assert!(breakout_options.len() >= 5);
        assert!(breakout_options.iter().any(|choice| {
            choice.preset == BreakoutSizePreset::Source
                && choice.width == 1280
                && choice.height == 720
        }));
    }

    #[test]
    fn swap_key_binding_tracks_selected_key_and_binding_mode() {
        let mut state = LauncherState::new();
        assert_eq!(state.swap_key, "pause");
        assert!(!state.swap_key_binding);

        let token = state.begin_swap_key_binding();
        assert!(state.swap_key_binding);
        assert_eq!(token, state.swap_key_binding_token);

        state.set_swap_key("F8");
        assert_eq!(state.swap_key, "f8");

        state.set_swap_key("   ");
        assert_eq!(state.swap_key, "off");

        state.finish_swap_key_binding();
        assert!(!state.swap_key_binding);
    }

    #[test]
    fn swap_key_binding_timeout_only_cancels_matching_attempt() {
        let mut state = LauncherState::new();
        let first = state.begin_swap_key_binding();
        let second = state.begin_swap_key_binding();

        assert!(!state.cancel_swap_key_binding(first));
        assert!(state.swap_key_binding);
        assert!(state.cancel_swap_key_binding(second));
        assert!(!state.swap_key_binding);
    }

    #[test]
    fn complete_swap_key_binding_updates_value_and_ends_binding() {
        let mut state = LauncherState::new();
        state.begin_swap_key_binding();

        state.complete_swap_key_binding("F12");

        assert_eq!(state.swap_key, "f12");
        assert!(!state.swap_key_binding);
    }

    #[test]
    fn push_note_accumulates_operator_context() {
        let mut state = LauncherState::new();
        state.push_note("preview warm");
        state.push_note("relay linked");

        assert_eq!(state.notes, vec!["preview warm", "relay linked"]);
    }

    #[test]
    fn capture_size_presets_map_to_real_device_modes() {
        let mut state = LauncherState::new();
        state.set_preview_source_profile(1920, 1080, 60);
        state.set_capture_size_preset(0, CaptureSizePreset::P1080);
        let source = state.capture_size_choice(0);
        assert_eq!(source.width, 1920);
        assert_eq!(source.height, 1080);
        assert_eq!(source.fps, 60);
        assert!(source.max_bitrate_kbit >= 18_000);

        state.set_capture_size_preset(0, CaptureSizePreset::P720);
        let hd = state.capture_size_choice(0);
        assert_eq!(hd.preset, CaptureSizePreset::P720);
        assert_eq!(hd.width, 1280);
        assert_eq!(hd.height, 720);
        assert_eq!(hd.fps, 60);

        state.set_capture_size_preset(0, CaptureSizePreset::P576);
        let compact = state.capture_size_choice(0);
        assert_eq!(compact.preset, CaptureSizePreset::P720);
        assert_eq!(compact.width, 1280);
        assert_eq!(compact.height, 720);
        assert_eq!(compact.fps, 60);

        state.set_capture_size_preset(0, CaptureSizePreset::Vga);
        let small = state.capture_size_choice(0);
        assert_eq!(small.preset, CaptureSizePreset::P720);
        assert_eq!(small.width, 1280);
        assert_eq!(small.height, 720);
        assert_eq!(small.fps, 60);
    }

    #[test]
    fn source_capture_knobs_follow_the_selected_native_mode() {
        let mut state = LauncherState::new();
        state.set_preview_source_profile(1920, 1080, 60);

        state.set_capture_size_preset(1, CaptureSizePreset::P1080);
        let defaults = state.capture_size_choice(1);
        assert_eq!(defaults.width, 1920);
        assert_eq!(defaults.height, 1080);
        assert_eq!(defaults.fps, 60);
        assert_eq!(defaults.max_bitrate_kbit, 18_000);

        state.set_capture_fps(1, 24);
        state.set_capture_bitrate_kbit(1, 8_500);
        let tuned = state.capture_size_choice(1);
        assert_eq!(tuned.preset, CaptureSizePreset::P1080);
        assert_eq!(tuned.width, 1920);
        assert_eq!(tuned.height, 1080);
        assert_eq!(tuned.fps, 60);
        assert_eq!(tuned.max_bitrate_kbit, 18_000);
    }

    #[test]
    fn source_capture_ignores_manual_fps_and_bitrate_knobs() {
        let mut state = LauncherState::new();
        state.set_preview_source_profile(1920, 1080, 60);
        state.set_capture_size_preset(0, CaptureSizePreset::P720);
        state.set_capture_fps(0, 60);
        state.set_capture_bitrate_kbit(0, 24_000);

        let source = state.capture_size_choice(0);
        assert_eq!(source.preset, CaptureSizePreset::P720);
        assert_eq!(source.width, 1280);
        assert_eq!(source.height, 720);
        assert_eq!(source.fps, 60);
        assert_eq!(source.max_bitrate_kbit, 12_000);
    }
}