viewpoint-core 0.3.3

//! Keyboard input handling.
//!
//! Provides direct keyboard control for simulating key presses, key holds,
//! and text input.

mod builder;
mod keys;
mod state;

use std::sync::Arc;
use std::time::Duration;

use tokio::sync::Mutex;
use tracing::{debug, instrument};
use viewpoint_cdp::CdpConnection;
use viewpoint_cdp::protocol::input::{DispatchKeyEventParams, InsertTextParams, KeyEventType};

use crate::error::LocatorError;

pub use builder::KeyboardPressBuilder;
pub use keys::{KeyDefinition, get_key_definition};
use state::{KeyboardState, is_modifier_key, is_uppercase_letter};

/// Keyboard controller for direct keyboard input.
///
/// Provides methods for pressing keys, typing text, and managing modifier state.
///
/// # Example
///
/// ```
/// # #[cfg(feature = "integration")]
/// # tokio_test::block_on(async {
/// # use viewpoint_core::Browser;
/// # let browser = Browser::launch().headless(true).launch().await.unwrap();
/// # let context = browser.new_context().await.unwrap();
/// # let page = context.new_page().await.unwrap();
/// # page.goto("about:blank").goto().await.unwrap();
///
/// // Press a single key
/// page.keyboard().press("Enter").await.unwrap();
///
/// // Type text character by character
/// page.keyboard().type_text("Hello").await.unwrap();
///
/// // Use key combinations
/// page.keyboard().press("Control+a").await.unwrap();
///
/// // Hold modifier and press keys
/// page.keyboard().down("Shift").await.unwrap();
/// page.keyboard().press("a").await.unwrap(); // Types 'A'
/// page.keyboard().up("Shift").await.unwrap();
/// # });
/// ```
#[derive(Debug)]
pub struct Keyboard {
    /// CDP connection.
    connection: Arc<CdpConnection>,
    /// Session ID for the page.
    session_id: String,
    /// Main frame ID for navigation detection.
    frame_id: String,
    /// Keyboard state.
    state: Mutex<KeyboardState>,
}

impl Keyboard {
    /// Create a new keyboard controller.
    pub(crate) fn new(
        connection: Arc<CdpConnection>,
        session_id: String,
        frame_id: String,
    ) -> Self {
        Self {
            connection,
            session_id,
            frame_id,
            state: Mutex::new(KeyboardState::new()),
        }
    }

    /// Get the connection (for builder access).
    pub(crate) fn connection(&self) -> &Arc<CdpConnection> {
        &self.connection
    }

    /// Get the session ID (for builder access).
    pub(crate) fn session_id(&self) -> &str {
        &self.session_id
    }

    /// Get the frame ID (for builder access).
    pub(crate) fn frame_id(&self) -> &str {
        &self.frame_id
    }

    /// Press and release a key or key combination.
    ///
    /// Returns a builder that can be configured with additional options, or awaited
    /// directly for a simple key press.
    ///
    /// # Arguments
    ///
    /// * `key` - Key to press. Can be:
    ///   - A single key: `"Enter"`, `"a"`, `"F1"`
    ///   - A key combination: `"Control+c"`, `"Shift+Tab"`
    ///   - `ControlOrMeta` for cross-platform shortcuts
    pub fn press(&self, key: &str) -> KeyboardPressBuilder<'_> {
        KeyboardPressBuilder::new(self, key)
    }

    /// Internal method to perform the actual key press.
    pub(crate) async fn press_internal(
        &self,
        key: &str,
        delay: Option<Duration>,
    ) -> Result<(), LocatorError> {
        // Parse key combination
        let parts: Vec<&str> = key.split('+').collect();
        let actual_key = parts.last().copied().unwrap_or(key);

        // Press modifiers
        for part in &parts[..parts.len().saturating_sub(1)] {
            let modifier_key = self.resolve_modifier(part);
            self.down(&modifier_key).await?;
        }

        // Check if actual_key is uppercase and we need to add Shift
        let need_shift = is_uppercase_letter(actual_key);
        if need_shift {
            self.down("Shift").await?;
        }

        // Press the actual key
        self.down(actual_key).await?;

        if let Some(d) = delay {
            tokio::time::sleep(d).await;
        }

        self.up(actual_key).await?;

        // Release Shift if we added it
        if need_shift {
            self.up("Shift").await?;
        }

        // Release modifiers in reverse order
        for part in parts[..parts.len().saturating_sub(1)].iter().rev() {
            let modifier_key = self.resolve_modifier(part);
            self.up(&modifier_key).await?;
        }

        Ok(())
    }

    /// Resolve platform-specific modifier keys.
    fn resolve_modifier(&self, key: &str) -> String {
        match key {
            "ControlOrMeta" => {
                // On macOS use Meta, on other platforms use Control
                if cfg!(target_os = "macos") {
                    "Meta".to_string()
                } else {
                    "Control".to_string()
                }
            }
            _ => key.to_string(),
        }
    }

    /// Press and hold a key.
    ///
    /// The key will remain pressed until `up()` is called.
    #[instrument(level = "debug", skip(self), fields(key = %key))]
    pub async fn down(&self, key: &str) -> Result<(), LocatorError> {
        let def = get_key_definition(key)
            .ok_or_else(|| LocatorError::EvaluationError(format!("Unknown key: {key}")))?;

        let is_repeat = {
            let mut state = self.state.lock().await;
            state.key_down(key)
        };

        let state = self.state.lock().await;
        let current_modifiers = state.modifiers;
        drop(state);

        debug!(code = def.code, key = def.key, is_repeat, "Key down");

        let params = DispatchKeyEventParams {
            event_type: KeyEventType::KeyDown,
            modifiers: Some(current_modifiers),
            timestamp: None,
            text: def.text.map(String::from),
            unmodified_text: def.text.map(String::from),
            key_identifier: None,
            code: Some(def.code.to_string()),
            key: Some(def.key.to_string()),
            windows_virtual_key_code: Some(def.key_code),
            native_virtual_key_code: Some(def.key_code),
            auto_repeat: Some(is_repeat),
            is_keypad: Some(def.is_keypad),
            is_system_key: None,
            commands: None,
        };

        self.dispatch_key_event(params).await?;

        // Send char event for printable characters
        if !is_modifier_key(key) {
            if let Some(text) = def.text {
                let char_params = DispatchKeyEventParams {
                    event_type: KeyEventType::Char,
                    modifiers: Some(current_modifiers),
                    timestamp: None,
                    text: Some(text.to_string()),
                    unmodified_text: Some(text.to_string()),
                    key_identifier: None,
                    code: Some(def.code.to_string()),
                    key: Some(def.key.to_string()),
                    windows_virtual_key_code: Some(def.key_code),
                    native_virtual_key_code: Some(def.key_code),
                    auto_repeat: None,
                    is_keypad: Some(def.is_keypad),
                    is_system_key: None,
                    commands: None,
                };
                self.dispatch_key_event(char_params).await?;
            }
        }

        Ok(())
    }

    /// Release a held key.
    #[instrument(level = "debug", skip(self), fields(key = %key))]
    pub async fn up(&self, key: &str) -> Result<(), LocatorError> {
        let def = get_key_definition(key)
            .ok_or_else(|| LocatorError::EvaluationError(format!("Unknown key: {key}")))?;

        {
            let mut state = self.state.lock().await;
            state.key_up(key);
        }

        let state = self.state.lock().await;
        let current_modifiers = state.modifiers;
        drop(state);

        debug!(code = def.code, key = def.key, "Key up");

        let params = DispatchKeyEventParams {
            event_type: KeyEventType::KeyUp,
            modifiers: Some(current_modifiers),
            timestamp: None,
            text: None,
            unmodified_text: None,
            key_identifier: None,
            code: Some(def.code.to_string()),
            key: Some(def.key.to_string()),
            windows_virtual_key_code: Some(def.key_code),
            native_virtual_key_code: Some(def.key_code),
            auto_repeat: None,
            is_keypad: Some(def.is_keypad),
            is_system_key: None,
            commands: None,
        };

        self.dispatch_key_event(params).await
    }

    /// Type text character by character with key events.
    ///
    /// This generates individual key events for each character.
    /// Use `insert_text()` for faster text entry without key events.
    #[instrument(level = "debug", skip(self), fields(text_len = text.len()))]
    pub async fn type_text(&self, text: &str) -> Result<(), LocatorError> {
        self.type_text_with_delay(text, None).await
    }

    /// Type text with a delay between each character.
    #[instrument(level = "debug", skip(self), fields(text_len = text.len()))]
    pub async fn type_text_with_delay(
        &self,
        text: &str,
        delay: Option<Duration>,
    ) -> Result<(), LocatorError> {
        for ch in text.chars() {
            let char_str = ch.to_string();

            // Get key definition if available, otherwise just send char event
            if get_key_definition(&char_str).is_some() {
                // Check if we need Shift for this character
                let need_shift = ch.is_ascii_uppercase();
                if need_shift {
                    self.down("Shift").await?;
                }

                self.down(&char_str).await?;
                self.up(&char_str).await?;

                if need_shift {
                    self.up("Shift").await?;
                }
            } else {
                // For characters without key definitions, send char event directly
                let params = DispatchKeyEventParams {
                    event_type: KeyEventType::Char,
                    modifiers: None,
                    timestamp: None,
                    text: Some(char_str.clone()),
                    unmodified_text: Some(char_str),
                    key_identifier: None,
                    code: None,
                    key: None,
                    windows_virtual_key_code: None,
                    native_virtual_key_code: None,
                    auto_repeat: None,
                    is_keypad: None,
                    is_system_key: None,
                    commands: None,
                };
                self.dispatch_key_event(params).await?;
            }

            if let Some(d) = delay {
                tokio::time::sleep(d).await;
            }
        }

        Ok(())
    }

    /// Insert text directly without generating key events.
    ///
    /// This is faster than `type_text()` and works with non-ASCII characters.
    /// No keydown/keyup events are dispatched.
    #[instrument(level = "debug", skip(self), fields(text_len = text.len()))]
    pub async fn insert_text(&self, text: &str) -> Result<(), LocatorError> {
        debug!("Inserting text directly");

        self.connection
            .send_command::<_, serde_json::Value>(
                "Input.insertText",
                Some(InsertTextParams {
                    text: text.to_string(),
                }),
                Some(&self.session_id),
            )
            .await?;

        Ok(())
    }

    /// Dispatch a key event to the browser.
    async fn dispatch_key_event(&self, params: DispatchKeyEventParams) -> Result<(), LocatorError> {
        self.connection
            .send_command::<_, serde_json::Value>(
                "Input.dispatchKeyEvent",
                Some(params),
                Some(&self.session_id),
            )
            .await?;
        Ok(())
    }
}