use std::rc::Rc;

use anyhow::Result;
use cursive::Printer;
use cursive::Rect;
use cursive::View;
use cursive::XY;
use cursive::direction::Direction;
use cursive::event::Event;
use cursive::event::EventResult;
use cursive::event::Key;
use cursive::traits::Resizable;
use cursive::view::Nameable;
use cursive::view::Selector;
use cursive::view::SizeConstraint;
use cursive::view::ViewNotFound;
use cursive::views::NamedView;
use cursive::views::ResizedView;
use getset::{Getters, MutGetters};

use crate::tabs::*;
use crate::runtime::Runtime;

pub const MAIN_VIEW_NAME: &'static str = "main_view";

#[derive(Getters, MutGetters)]
pub struct MainView {
    rt: Rc<Runtime>,

    #[getset(get = "pub", get_mut = "pub")]
    tabs: crate::tabs::Tabs,
}

impl MainView {
    pub fn new(rt: Rc<Runtime>) -> Result<NamedView<Self>> {
        let default_query = rt.config().notmuch_default_query();
        let tabs = Tabs::new(default_query, rt.clone())?;

        Ok(MainView { rt, tabs }.with_name(MAIN_VIEW_NAME))
    }

    pub fn add_tab_for_query(&mut self, query: &str) -> Result<()> {
        self.tabs.add_tab_for_query(self.rt.clone(), query)
    }

    pub fn get_current_tab(&self) -> Option<&cursive_multiplex::Mux> {
        if let Some(mux) = self.tabs.get_active_tab() {
            mux.downcast_ref::<cursive_multiplex::Mux>()
        } else {
            None
        }
    }

    pub fn get_current_mux(&self) -> Option<&Box<dyn cursive::View>> {
        if let Some(mux) = self.get_current_tab() {
            return mux.get_current_view()
        }

        None
    }

    pub fn get_current_tab_mut(&mut self) -> Option<&mut cursive_multiplex::Mux> {
        if let Some(mux) = self.tabs.get_active_tab_mut() {
            mux.downcast_mut::<cursive_multiplex::Mux>()
        } else {
            None
        }
    }

    pub fn get_current_mux_mut(&mut self) -> Option<&mut Box<dyn cursive::View>> {
        if let Some(mut mux) = self.get_current_tab_mut() {
            return mux.get_current_view_mut()
        }

        None
    }

}

impl View for MainView {
    fn draw(&self, printer: &Printer) {
        self.tabs.draw(printer);
    }

    fn layout(&mut self, xy: XY<usize>) {
        self.tabs.layout(xy)
    }

    fn needs_relayout(&self) -> bool {
        self.tabs.needs_relayout()
    }

    fn required_size(&mut self, constraint: XY<usize>) -> XY<usize> {
        self.tabs.required_size(constraint)
    }

    fn on_event(&mut self, e: Event) -> EventResult {
        debug!("Received event: {:?}", e);
        self.tabs.on_event(e)
    }

    fn call_on_any<'a>(&mut self, s: &Selector, tpl: &'a mut (dyn FnMut(&mut (dyn View + 'static)) + 'a)) {
        self.tabs.call_on_any(s, tpl);
    }

    fn focus_view(&mut self, s: &Selector) -> Result<(), ViewNotFound> {
        self.tabs.focus_view(s)
    }

    fn take_focus(&mut self, source: Direction) -> bool {
        self.tabs.take_focus(source)
    }

    fn important_area(&self, view_size: XY<usize>) -> Rect {
        self.tabs.important_area(view_size)
    }

    fn type_name(&self) -> &'static str {
        self.tabs.type_name()
    }

}