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use std::collections::HashMap;
use specs::{
ReadStorage,
Read,
Write,
System,
Join
};
use super::super::pos::Pos;
use super::super::components::{
Visible,
Played
};
use super::super::resources::{
Size,
Output
};
use super::super::worldmessages::{
WorldMessage,
WorldUpdate,
FieldMessage
};
pub struct View;
impl <'a> System<'a> for View {
type SystemData = (ReadStorage<'a, Pos>, ReadStorage<'a, Visible>, Read<'a, Size>, ReadStorage<'a, Played>, Write<'a, Output>);
fn run(&mut self, (positions, visible, size, players, mut output): Self::SystemData) {
let mut cells: HashMap<Pos, Vec<Visible>> = HashMap::new();
for (pos, vis) in (&positions, &visible).join(){
cells.entry(*pos).or_insert(Vec::new()).push(vis.clone());
cells.get_mut(pos).unwrap().sort_by(|a, b| b.height.partial_cmp(&a.height).unwrap());
}
let width = size.width;
let height = size.height;
let (values, mapping) = draw_room(cells, (width, height));
let field = WorldUpdate::Field(FieldMessage{
width,
height,
field: values,
mapping
});
output.output.clear();
for (player, pos) in (&players, &positions).join() {
let message = WorldMessage{updates: vec![
field.clone(),
WorldUpdate::Pos(*pos)
]};
output.output.insert(player.name.clone(), message);
}
}
}
fn draw_room(cells: HashMap<Pos, Vec<Visible>>, (width, height): (i32, i32)) -> (Vec<usize>, Vec<Vec<String>>){
let size = width * height;
let mut values :Vec<usize> = Vec::with_capacity(size as usize);
let mut mapping: Vec<Vec<String>> = Vec::new();
for y in 0..height {
for x in 0..width {
let sprites: Vec<String> = match cells.get(&Pos{x: x, y: y}) {
Some(sprites) => {sprites.iter().map(|v| v.sprite.clone()).collect()}
None => {vec![]}
};
values.push(
match mapping.iter().position(|x| x == &sprites) {
Some(index) => {
index
}
None => {
mapping.push(sprites);
mapping.len() - 1
}
}
)
}
}
(values, mapping)
}
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