use crate::notification_window_options;
use call::{ActiveCall, IncomingCall};
use client::proto;
use futures::StreamExt;
use gpui::{
    elements::*,
    geometry::vector::vec2f,
    platform::{CursorStyle, MouseButton},
    AnyElement, AppContext, Entity, View, ViewContext, WindowHandle,
};
use std::sync::{Arc, Weak};
use util::ResultExt;
use workspace::AppState;

pub fn init(app_state: &Arc<AppState>, cx: &mut AppContext) {
    let app_state = Arc::downgrade(app_state);
    let mut incoming_call = ActiveCall::global(cx).read(cx).incoming();
    cx.spawn(|mut cx| async move {
        let mut notification_windows: Vec<WindowHandle<IncomingCallNotification>> = Vec::new();
        while let Some(incoming_call) = incoming_call.next().await {
            for window in notification_windows.drain(..) {
                window.remove(&mut cx);
            }

            if let Some(incoming_call) = incoming_call {
                let window_size = cx.read(|cx| {
                    let theme = &theme::current(cx).incoming_call_notification;
                    vec2f(theme.window_width, theme.window_height)
                });

                for screen in cx.platform().screens() {
                    let window = cx
                        .add_window(notification_window_options(screen, window_size), |_| {
                            IncomingCallNotification::new(incoming_call.clone(), app_state.clone())
                        });

                    notification_windows.push(window);
                }
            }
        }
    })
    .detach();
}

#[derive(Clone, PartialEq)]
struct RespondToCall {
    accept: bool,
}

pub struct IncomingCallNotification {
    call: IncomingCall,
    app_state: Weak<AppState>,
}

impl IncomingCallNotification {
    pub fn new(call: IncomingCall, app_state: Weak<AppState>) -> Self {
        Self { call, app_state }
    }

    fn respond(&mut self, accept: bool, cx: &mut ViewContext<Self>) {
        let active_call = ActiveCall::global(cx);
        if accept {
            let join = active_call.update(cx, |active_call, cx| active_call.accept_incoming(cx));
            let caller_user_id = self.call.calling_user.id;
            let initial_project_id = self.call.initial_project.as_ref().map(|project| project.id);
            let app_state = self.app_state.clone();
            cx.app_context()
                .spawn(|mut cx| async move {
                    join.await?;
                    if let Some(project_id) = initial_project_id {
                        cx.update(|cx| {
                            if let Some(app_state) = app_state.upgrade() {
                                workspace::join_remote_project(
                                    project_id,
                                    caller_user_id,
                                    app_state,
                                    cx,
                                )
                                .detach_and_log_err(cx);
                            }
                        });
                    }
                    anyhow::Ok(())
                })
                .detach_and_log_err(cx);
        } else {
            active_call.update(cx, |active_call, cx| {
                active_call.decline_incoming(cx).log_err();
            });
        }
    }

    fn render_caller(&self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
        let theme = &theme::current(cx).incoming_call_notification;
        let default_project = proto::ParticipantProject::default();
        let initial_project = self
            .call
            .initial_project
            .as_ref()
            .unwrap_or(&default_project);
        Flex::row()
            .with_children(self.call.calling_user.avatar.clone().map(|avatar| {
                Image::from_data(avatar)
                    .with_style(theme.caller_avatar)
                    .aligned()
            }))
            .with_child(
                Flex::column()
                    .with_child(
                        Label::new(
                            self.call.calling_user.github_login.clone(),
                            theme.caller_username.text.clone(),
                        )
                        .contained()
                        .with_style(theme.caller_username.container),
                    )
                    .with_child(
                        Label::new(
                            format!(
                                "is sharing a project in Zed{}",
                                if initial_project.worktree_root_names.is_empty() {
                                    ""
                                } else {
                                    ":"
                                }
                            ),
                            theme.caller_message.text.clone(),
                        )
                        .contained()
                        .with_style(theme.caller_message.container),
                    )
                    .with_children(if initial_project.worktree_root_names.is_empty() {
                        None
                    } else {
                        Some(
                            Label::new(
                                initial_project.worktree_root_names.join(", "),
                                theme.worktree_roots.text.clone(),
                            )
                            .contained()
                            .with_style(theme.worktree_roots.container),
                        )
                    })
                    .contained()
                    .with_style(theme.caller_metadata)
                    .aligned(),
            )
            .contained()
            .with_style(theme.caller_container)
            .flex(1., true)
            .into_any()
    }

    fn render_buttons(&self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
        enum Accept {}
        enum Decline {}

        let theme = theme::current(cx);
        Flex::column()
            .with_child(
                MouseEventHandler::new::<Accept, _>(0, cx, |_, _| {
                    let theme = &theme.incoming_call_notification;
                    Label::new("Accept", theme.accept_button.text.clone())
                        .aligned()
                        .contained()
                        .with_style(theme.accept_button.container)
                })
                .with_cursor_style(CursorStyle::PointingHand)
                .on_click(MouseButton::Left, |_, this, cx| {
                    this.respond(true, cx);
                })
                .flex(1., true),
            )
            .with_child(
                MouseEventHandler::new::<Decline, _>(0, cx, |_, _| {
                    let theme = &theme.incoming_call_notification;
                    Label::new("Decline", theme.decline_button.text.clone())
                        .aligned()
                        .contained()
                        .with_style(theme.decline_button.container)
                })
                .with_cursor_style(CursorStyle::PointingHand)
                .on_click(MouseButton::Left, |_, this, cx| {
                    this.respond(false, cx);
                })
                .flex(1., true),
            )
            .constrained()
            .with_width(theme.incoming_call_notification.button_width)
            .into_any()
    }
}

impl Entity for IncomingCallNotification {
    type Event = ();
}

impl View for IncomingCallNotification {
    fn ui_name() -> &'static str {
        "IncomingCallNotification"
    }

    fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
        let background = theme::current(cx).incoming_call_notification.background;
        Flex::row()
            .with_child(self.render_caller(cx))
            .with_child(self.render_buttons(cx))
            .contained()
            .with_background_color(background)
            .expanded()
            .into_any()
    }
}