use ::specs::prelude::*;

use super::obfuscate_name;
use crate::components::{
    EquipmentChanged, InBackpack, MagicItem, Name, ObfuscatedName, Position, WantsToDropItem,
};
use crate::{colors, gamelog, MasterDungeonMap};

pub struct ItemDropSystem {}

impl<'a> System<'a> for ItemDropSystem {
    #[allow(clippy::type_complexity)]
    type SystemData = (
        ReadExpect<'a, Entity>,
        Entities<'a>,
        WriteStorage<'a, WantsToDropItem>,
        ReadStorage<'a, Name>,
        WriteStorage<'a, Position>,
        WriteStorage<'a, InBackpack>,
        WriteStorage<'a, EquipmentChanged>,
        ReadStorage<'a, MagicItem>,
        ReadStorage<'a, ObfuscatedName>,
        ReadExpect<'a, MasterDungeonMap>,
    );

    fn run(&mut self, data: Self::SystemData) {
        let (
            player_entity,
            entities,
            mut wants_drop,
            names,
            mut positions,
            mut backpack,
            mut dirty,
            magic_items,
            obfuscated_names,
            dm,
        ) = data;

        for (entity, to_drop) in (&entities, &wants_drop).join() {
            let mut dropper_pos: Position = Position { x: 0, y: 0 };
            {
                let dropped_pos = positions.get(entity).unwrap();
                dropper_pos.x = dropped_pos.x;
                dropper_pos.y = dropped_pos.y;
            }

            positions
                .insert(
                    to_drop.item,
                    Position {
                        x: dropper_pos.x,
                        y: dropper_pos.y,
                    },
                )
                .expect("Unable to drop item to position");

            backpack.remove(to_drop.item);

            dirty
                .insert(entity, EquipmentChanged {})
                .expect("Unable to insert equipment change");

            if entity == *player_entity {
                gamelog::line("You drop the")
                    .append_color(
                        colors::CYAN,
                        obfuscate_name(to_drop.item, &names, &magic_items, &obfuscated_names, &dm),
                    )
                    .log();
            }
        }

        wants_drop.clear();
    }
}