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use orbclient::{Color, Renderer};
use orbimage;
use std::cell::{Cell, RefCell};
use std::path::Path;
use std::sync::Arc;

use event::Event;
use point::Point;
use rect::Rect;
use thickness::Thickness;
use theme::{Theme};
use traits::{Click, Place};
use widgets::{Widget, VerticalPlacement, HorizontalPlacement};

pub struct Image {
    pub rect: Cell<Rect>,
    local_position: Cell<Point>,
    vertical_placement: Cell<VerticalPlacement>,
    horizontal_placement: Cell<HorizontalPlacement>,
    margin: Cell<Thickness>,
    children: RefCell<Vec<Arc<dyn Widget>>>,
    pub image: RefCell<orbimage::Image>,
    click_callback: RefCell<Option<Arc<dyn Fn(&Image, Point)>>>,
}

impl Image {
    pub fn new(width: u32, height: u32) -> Arc<Self> {
        Self::from_image(orbimage::Image::new(width, height))
    }

    pub fn from_color(width: u32, height: u32, color: Color) -> Arc<Self> {
        Self::from_image(orbimage::Image::from_color(width, height, color))
    }

    pub fn from_image(image: orbimage::Image) -> Arc<Self> {
        Arc::new(Image {
            rect: Cell::new(Rect::new(0, 0, image.width(), image.height())),
            local_position: Cell::new(Point::new(0, 0)),
            vertical_placement: Cell::new(VerticalPlacement::Absolute),
            horizontal_placement: Cell::new(HorizontalPlacement::Absolute),
            margin: Cell::new(Thickness::default()),
            children: RefCell::new(vec![]),
            image: RefCell::new(image),
            click_callback: RefCell::new(None)
        })
    }

    pub fn from_path<P: AsRef<Path>>(path: P) -> Result<Arc<Self>, String> {
        Ok(Self::from_image(orbimage::Image::from_path(path)?))
    }
}

impl Click for Image {
    fn emit_click(&self, point: Point) {
        if let Some(ref click_callback) = *self.click_callback.borrow() {
            click_callback(self, point);
        }
    }

    fn on_click<T: Fn(&Self, Point) + 'static>(&self, func: T) -> &Self {
        *self.click_callback.borrow_mut() = Some(Arc::new(func));
        self
    }
}

impl Place for Image {}

impl Widget for Image {
    fn name(&self) -> &str {
        "Image"
    }

    fn rect(&self) -> &Cell<Rect> {
        &self.rect
    }

    fn vertical_placement(&self) -> &Cell<VerticalPlacement> {
        &self.vertical_placement
    }

    fn horizontal_placement(&self) -> &Cell<HorizontalPlacement> {
        &self.horizontal_placement
    }

    fn margin(&self) -> &Cell<Thickness> {
        &self.margin
    }

    fn local_position(&self) -> &Cell<Point> {
        &self.local_position
    }

    fn draw(&self, renderer: &mut dyn Renderer, _focused: bool, _theme: &Theme) {
        let rect = self.rect.get();
        let image = self.image.borrow();
        renderer.image(rect.x, rect.y, image.width(), image.height(), image.data());
    }

    fn event(&self, event: Event, focused: bool, redraw: &mut bool, caught: &mut bool) -> bool {
        match event {
            Event::Mouse { point, left_button, .. } => {
                let rect = self.rect.get();
                if rect.contains(point) {
                    if left_button {
                        let click_point: Point = point - rect.point();
                        self.emit_click(click_point);
                        *redraw = true;
                    }
                    *caught = true;
                }
            }
            _ => (),
        }

        focused
    }

    fn children(&self) -> &RefCell<Vec<Arc<dyn Widget>>> {
        &self.children
    }
}