/*
    Hurry Curry! - a game about cooking
    Copyright 2024 metamuffin

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, version 3 of the License only.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/
use super::{Entity, EntityContext};
use crate::interaction::interact;
use anyhow::{anyhow, bail, Result};
use hurrycurry_protocol::{glam::IVec2, ItemIndex, ItemLocation};

#[derive(Debug, Clone)]
pub struct Conveyor {
    pub(super) from: IVec2,
    pub(super) to: IVec2,
    pub(super) filter_tile: Option<IVec2>,
    pub(super) filter_item: Option<ItemIndex>,
    pub(super) cooldown: f32,
    pub(super) max_cooldown: f32,
}

impl Entity for Conveyor {
    fn tick(&mut self, c: EntityContext) -> Result<()> {
        let from = c
            .game
            .tiles
            .get(&self.from)
            .ok_or(anyhow!("conveyor from missing"))?;

        if let Some(from_item) = from.item.as_ref() {
            let filter = if let Some(t) = &self.filter_tile {
                let filter_tile = c
                    .game
                    .tiles
                    .get(t)
                    .ok_or(anyhow!("conveyor filter missing"))?;
                filter_tile.item.as_ref().map(|e| e.kind)
            } else {
                self.filter_item.as_ref().map(|i| *i)
            };

            if let Some(filter) = filter {
                if from_item.kind != filter {
                    return Ok(());
                }
            }

            self.cooldown += c.dt;
            if self.cooldown < self.max_cooldown {
                return Ok(());
            }
            self.cooldown = 0.;

            if self.from == self.to {
                bail!("conveyor does ends in itself")
            }
            let [Some(from), Some(to)] = c.game.tiles.get_many_mut([&self.from, &self.to]) else {
                bail!("at least one conveyor end not on map");
            };

            interact(
                &c.game.data,
                true,
                Some(to.kind),
                None,
                &mut to.item,
                ItemLocation::Tile(self.to),
                &mut from.item,
                ItemLocation::Tile(self.from),
                &mut c.game.score,
                c.score_changed,
                true,
                c.packet_out,
            );
        }

        Ok(())
    }
}