// client/src/input/inputs.rs

use anyhow::{bail, Context, Result};
use evdev::{Device, EventType, KeyCode, RelativeAxisCode};
use tokio::{sync::broadcast::Sender, time::{interval, Duration}};
use tracing::{debug, info, warn};

use lesavka_common::lesavka::{KeyboardReport, MouseReport};

use super::{keyboard::KeyboardAggregator, mouse::MouseAggregator};
use crate::layout::{Layout, apply as apply_layout};

pub struct InputAggregator {
    kbd_tx: Sender<KeyboardReport>,
    mou_tx: Sender<MouseReport>,
    dev_mode: bool,
    released: bool,
    magic_active: bool,
    keyboards: Vec<KeyboardAggregator>,
    mice: Vec<MouseAggregator>,
}

impl InputAggregator {
    pub fn new(dev_mode: bool,
               kbd_tx: Sender<KeyboardReport>,
               mou_tx: Sender<MouseReport>) -> Self {
        Self { kbd_tx, mou_tx, dev_mode, released: false, magic_active: false,
               keyboards: Vec::new(), mice: Vec::new()
            }
    }

    /// Called once at startup: enumerates input devices,
    /// classifies them, and constructs a aggregator struct per type.
    pub fn init(&mut self) -> Result<()> {
        let paths = std::fs::read_dir("/dev/input")
            .context("Failed to read /dev/input")?;

        let mut found_any = false;

        for entry in paths {
            let entry = entry?;
            let path = entry.path();

            // skip anything that isn't "event*"
            if !path.file_name().map_or(false, |f| f.to_string_lossy().starts_with("event")) {
                continue;
            }

            // ─── open the event node read-write *without* unsafe ──────────
            let mut dev = match Device::open(&path) {
                Ok(d) => d,
                Err(e) => {
                    warn!("❌ open {}: {e}", path.display());
                    continue;
                }
            };

            // non-blocking so fetch_events never stalls the whole loop
            dev.set_nonblocking(true).with_context(|| format!("set_non_blocking {:?}", path))?;

            match classify_device(&dev) {
                DeviceKind::Keyboard => {
                    dev.grab().with_context(|| format!("grabbing keyboard {path:?}"))?;
                    info!("🤏🖱️ Grabbed keyboard {:?}", dev.name().unwrap_or("UNKNOWN"));

                    // pass dev_mode to aggregator
                    // let kbd_agg = KeyboardAggregator::new(dev, self.dev_mode);
                    let kbd_agg = KeyboardAggregator::new(dev, self.dev_mode, self.kbd_tx.clone());
                    self.keyboards.push(kbd_agg);
                    found_any = true;
                    continue;
                }
                DeviceKind::Mouse => {
                    dev.grab().with_context(|| format!("grabbing mouse {path:?}"))?;
                    info!("🤏⌨️ Grabbed mouse {:?}", dev.name().unwrap_or("UNKNOWN"));

                    // let mouse_agg = MouseAggregator::new(dev);
                    let mouse_agg = MouseAggregator::new(dev, self.dev_mode, self.mou_tx.clone());
                    self.mice.push(mouse_agg);
                    found_any = true;
                    continue;
                }
                DeviceKind::Other => {
                    debug!("Skipping non-kbd/mouse device: {:?}", dev.name().unwrap_or("UNKNOWN"));
                    continue;
                }
            }
        }

        if !found_any {
            bail!("No suitable keyboard/mouse devices found or none grabbed.");
        }

        Ok(())
    }

    /// We spawn the sub-aggregators in a loop or using separate tasks.
    /// (For a real system: you'd spawn a separate task for each aggregator.)
    pub async fn run(&mut self) -> Result<()> {
        // Example approach: poll each aggregator in a simple loop
        let mut tick = interval(Duration::from_millis(10));
        let mut current = Layout::SideBySide;
        loop {
            let magic_now = self.keyboards.iter().any(|k| k.magic_grab());
            let magic_left = self.keyboards.iter().any(|k| k.magic_left());
            let magic_right = self.keyboards.iter().any(|k| k.magic_right());
            let mut want_kill   = false;
            for kbd in &mut self.keyboards {
                kbd.process_events();
                want_kill   |= kbd.magic_kill();
            }

            if magic_now && !self.magic_active { self.toggle_grab(); }
            if (magic_left || magic_right) && self.magic_active {
                current = match current {
                    Layout::SideBySide => Layout::FullLeft,
                    Layout::FullLeft   => Layout::FullRight,
                    Layout::FullRight  => Layout::SideBySide,
                };
                apply_layout(current);
            }
            if want_kill   { 
                warn!("🧙  magic chord - killing 🪄 AVADA KEDAVRA!!! 💥💀⚰️");
                std::process::exit(0); 
            }

            for mouse in &mut self.mice {
                mouse.process_events();
            }

            self.magic_active = magic_now;
            tick.tick().await;
        }
    }

    fn toggle_grab(&mut self) {
        if self.released {
            tracing::info!("🧙  magic chord - restricting devices 🪄 IMPERIUS!!! 🎮🔒");
        } else {
            tracing::info!("🧙  magic chord - freeing devices 🪄 EXPELLIARMUS!!! 🔓🕊️");
        }
        for k in &mut self.keyboards { k.set_grab(self.released); k.set_send(self.released); }
        for m in &mut self.mice      { m.set_grab(self.released); m.set_send(self.released); }
        self.released = !self.released;
    }
}

/// The classification function
fn classify_device(dev: &Device) -> DeviceKind {
    let evbits = dev.supported_events();

    // Keyboard logic
    if evbits.contains(EventType::KEY) {
        if let Some(keys) = dev.supported_keys() {
            if keys.contains(KeyCode::KEY_A) || keys.contains(KeyCode::KEY_ENTER) {
                return DeviceKind::Keyboard;
            }
        }
    }

    // Mouse logic
    if evbits.contains(EventType::RELATIVE) {
        if let (Some(rel), Some(keys)) =
            (dev.supported_relative_axes(), dev.supported_keys())
        {
            let has_xy = rel.contains(RelativeAxisCode::REL_X)
                      && rel.contains(RelativeAxisCode::REL_Y);
            let has_btn = keys.contains(KeyCode::BTN_LEFT)
                       || keys.contains(KeyCode::BTN_RIGHT);
            if has_xy && has_btn {
                return DeviceKind::Mouse;
            }
        }
    }

    DeviceKind::Other
}

/// Internal enum for device classification
#[derive(Debug, Clone, Copy)]
enum DeviceKind {
    Keyboard,
    Mouse,
    Other,
}