/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//! The high-level interface from script to constellation. Using this abstract interface helps
//! reduce coupling between these two components.

use geom::rect::Rect;
use geom::size::TypedSize2D;
use geom::scale_factor::ScaleFactor;
use http::headers::request::HeaderCollection as RequestHeaderCollection;
use http::method::{Method, Get};
use layers::geometry::DevicePixel;
use servo_util::geometry::{PagePx, ViewportPx};
use std::comm::{channel, Sender, Receiver};
use url::Url;

#[deriving(Clone)]
pub struct ConstellationChan(pub Sender<Msg>);

impl ConstellationChan {
    pub fn new() -> (Receiver<Msg>, ConstellationChan) {
        let (chan, port) = channel();
        (port, ConstellationChan(chan))
    }
}

#[deriving(PartialEq)]
pub enum IFrameSandboxState {
    IFrameSandboxed,
    IFrameUnsandboxed
}

// We pass this info to various tasks, so it lives in a separate, cloneable struct.
#[deriving(Clone)]
pub struct Failure {
    pub pipeline_id: PipelineId,
    pub subpage_id: Option<SubpageId>,
}

pub struct WindowSizeData {
    /// The size of the initial layout viewport, before parsing an
    /// http://www.w3.org/TR/css-device-adapt/#initial-viewport
    pub initial_viewport: TypedSize2D<ViewportPx, f32>,

    /// The "viewing area" in page px. See `PagePx` documentation for details.
    pub visible_viewport: TypedSize2D<PagePx, f32>,

    /// The resolution of the window in dppx, not including any "pinch zoom" factor.
    pub device_pixel_ratio: ScaleFactor<ViewportPx, DevicePixel, f32>,
}

#[deriving(PartialEq)]
pub enum KeyState {
    Pressed,
    Released,
    Repeated,
}

//N.B. Straight up copied from glfw-rs
#[deriving(Show)]
pub enum Key {
    KeySpace,
    KeyApostrophe,
    KeyComma,
    KeyMinus,
    KeyPeriod,
    KeySlash,
    Key0,
    Key1,
    Key2,
    Key3,
    Key4,
    Key5,
    Key6,
    Key7,
    Key8,
    Key9,
    KeySemicolon,
    KeyEqual,
    KeyA,
    KeyB,
    KeyC,
    KeyD,
    KeyE,
    KeyF,
    KeyG,
    KeyH,
    KeyI,
    KeyJ,
    KeyK,
    KeyL,
    KeyM,
    KeyN,
    KeyO,
    KeyP,
    KeyQ,
    KeyR,
    KeyS,
    KeyT,
    KeyU,
    KeyV,
    KeyW,
    KeyX,
    KeyY,
    KeyZ,
    KeyLeftBracket,
    KeyBackslash,
    KeyRightBracket,
    KeyGraveAccent,
    KeyWorld1,
    KeyWorld2,

    KeyEscape,
    KeyEnter,
    KeyTab,
    KeyBackspace,
    KeyInsert,
    KeyDelete,
    KeyRight,
    KeyLeft,
    KeyDown,
    KeyUp,
    KeyPageUp,
    KeyPageDown,
    KeyHome,
    KeyEnd,
    KeyCapsLock,
    KeyScrollLock,
    KeyNumLock,
    KeyPrintScreen,
    KeyPause,
    KeyF1,
    KeyF2,
    KeyF3,
    KeyF4,
    KeyF5,
    KeyF6,
    KeyF7,
    KeyF8,
    KeyF9,
    KeyF10,
    KeyF11,
    KeyF12,
    KeyF13,
    KeyF14,
    KeyF15,
    KeyF16,
    KeyF17,
    KeyF18,
    KeyF19,
    KeyF20,
    KeyF21,
    KeyF22,
    KeyF23,
    KeyF24,
    KeyF25,
    KeyKp0,
    KeyKp1,
    KeyKp2,
    KeyKp3,
    KeyKp4,
    KeyKp5,
    KeyKp6,
    KeyKp7,
    KeyKp8,
    KeyKp9,
    KeyKpDecimal,
    KeyKpDivide,
    KeyKpMultiply,
    KeyKpSubtract,
    KeyKpAdd,
    KeyKpEnter,
    KeyKpEqual,
    KeyLeftShift,
    KeyLeftControl,
    KeyLeftAlt,
    KeyLeftSuper,
    KeyRightShift,
    KeyRightControl,
    KeyRightAlt,
    KeyRightSuper,
    KeyMenu,
}

bitflags! {
    flags KeyModifiers: u8 {
        const SHIFT = 0x01,
        const CONTROL = 0x02,
        const ALT = 0x04,
        const SUPER = 0x08,
    }
}

/// Messages from the compositor and script to the constellation.
pub enum Msg {
    ExitMsg,
    FailureMsg(Failure),
    InitLoadUrlMsg(Url),
    LoadCompleteMsg,
    FrameRectMsg(PipelineId, SubpageId, Rect<f32>),
    LoadUrlMsg(PipelineId, LoadData),
    ScriptLoadedURLInIFrameMsg(Url, PipelineId, SubpageId, IFrameSandboxState),
    NavigateMsg(NavigationDirection),
    RendererReadyMsg(PipelineId),
    ResizedWindowMsg(WindowSizeData),
    KeyEvent(Key, KeyState, KeyModifiers),
}

/// Similar to net::resource_task::LoadData
/// can be passed to LoadUrlMsg to load a page with GET/POST
/// parameters or headers
#[deriving(Clone)]
pub struct LoadData {
    pub url: Url,
    pub method: Method,
    pub headers: RequestHeaderCollection,
    pub data: Option<Vec<u8>>,
}

impl LoadData {
    pub fn new(url: Url) -> LoadData {
        LoadData {
            url: url,
            method: Get,
            headers: RequestHeaderCollection::new(),
            data: None,
        }
    }
}

/// Represents the two different ways to which a page can be navigated
#[deriving(Clone, PartialEq, Hash, Show)]
pub enum NavigationType {
    Load,               // entered or clicked on a url
    Navigate,           // browser forward/back buttons
}

#[deriving(Clone, PartialEq, Hash, Show)]
pub enum NavigationDirection {
    Forward,
    Back,
}

#[deriving(Clone, PartialEq, Eq, Hash, Show)]
pub struct PipelineId(pub uint);

#[deriving(Clone, PartialEq, Eq, Hash, Show)]
pub struct SubpageId(pub uint);