roguelike/src/spawner.rs

use std::collections::HashMap;

use rltk::{FontCharType, RandomNumberGenerator, RGB};
use specs::prelude::*;
use specs::saveload::{MarkedBuilder, SimpleMarker};

use crate::random_table::RandomTable;
use crate::rect::Rect;
use crate::{
    AreaOfEffect, BlocksTile, CombatStats, Confusion, Consumable, InflictsDamage, Item, Monster,
    Name, Player, Position, ProvidesHealing, Ranged, Renderable, SerializeMe, Viewshed, MAP_WIDTH,
    MAX_ITEMS, MAX_MONSTER,
};

pub fn player(ecs: &mut World, player_x: i32, player_y: i32) -> Entity {
    ecs.create_entity()
        .with(Position {
            x: player_x,
            y: player_y,
        })
        .with(Renderable {
            glyph: rltk::to_cp437('@'),
            fg: RGB::named(rltk::YELLOW),
            bg: RGB::named(rltk::BLACK),
            render_order: 0,
        })
        .with(Player {})
        .with(Viewshed {
            visible_tiles: Vec::new(),
            range: 8,
            dirty: true,
        })
        .with(Name {
            name: "Player".to_string(),
        })
        .with(CombatStats {
            max_hp: 30,
            hp: 30,
            defense: 2,
            power: 5,
        })
        .marked::<SimpleMarker<SerializeMe>>()
        .build()
}

fn orc(ecs: &mut World, x: i32, y: i32) {
    monster(ecs, x, y, rltk::to_cp437('o'), "Orc")
}

fn goblin(ecs: &mut World, x: i32, y: i32) {
    monster(ecs, x, y, rltk::to_cp437('g'), "Goblin")
}

fn monster<S: ToString>(ecs: &mut World, x: i32, y: i32, glyph: FontCharType, name: S) {
    ecs.create_entity()
        .with(Position { x, y })
        .with(Renderable {
            glyph,
            fg: RGB::named(rltk::RED),
            bg: RGB::named(rltk::BLACK),
            render_order: 1,
        })
        .with(Viewshed {
            visible_tiles: Vec::new(),
            range: 8,
            dirty: true,
        })
        .with(Monster {})
        .with(Name {
            name: name.to_string(),
        })
        .with(BlocksTile {})
        .with(CombatStats {
            max_hp: 16,
            hp: 16,
            defense: 1,
            power: 4,
        })
        .marked::<SimpleMarker<SerializeMe>>()
        .build();
}

#[allow(clippy::map_entry)]
pub fn spawn_room(ecs: &mut World, room: &Rect, map_depth: i32) {
    let spawn_table = room_table(map_depth);
    let mut spawn_points: HashMap<usize, String> = HashMap::new();

    {
        let mut rng = ecs.write_resource::<RandomNumberGenerator>();
        let num_spawns = rng.roll_dice(1, MAX_MONSTER + 3) + (map_depth - 1) - 3;

        for _i in 0..num_spawns {
            let mut added = false;
            let mut tried = 0;
            while !added && tried < 20 {
                let x = (room.x1 + rng.roll_dice(1, i32::abs(room.x2 - room.x1))) as usize;
                let y = (room.y1 + rng.roll_dice(1, i32::abs(room.y2 - room.y1))) as usize;
                let idx = (y * MAP_WIDTH) + x;
                if !spawn_points.contains_key(&idx) {
                    spawn_points.insert(idx, spawn_table.roll(&mut rng));
                    added = true;
                } else {
                    tried += 1;
                }
            }
        }
    }

    for spawn in spawn_points.iter() {
        let x = (*spawn.0 % MAP_WIDTH) as i32;
        let y = (*spawn.0 / MAP_WIDTH) as i32;

        match spawn.1.as_ref() {
            "Goblin" => goblin(ecs, x, y),
            "Orc" => orc(ecs, x, y),
            "Health Potion" => health_potion(ecs, x, y),
            "Fireball Scroll" => fireball_scroll(ecs, x, y),
            "Confusion Scroll" => confusion_scroll(ecs, x, y),
            "Magic Missile Scroll" => magic_missile_scroll(ecs, x, y),
            _ => {}
        }
    }
}

pub fn health_potion(ecs: &mut World, x: i32, y: i32) {
    ecs.create_entity()
        .with(Position { x, y })
        .with(Renderable {
            glyph: rltk::to_cp437('i'),
            fg: RGB::named(rltk::MAGENTA),
            bg: RGB::named(rltk::BLACK),
            render_order: 2,
        })
        .with(Name {
            name: "Health Potion".to_string(),
        })
        .with(Item {})
        .with(Consumable {})
        .with(ProvidesHealing { heal_amount: 8 })
        .marked::<SimpleMarker<SerializeMe>>()
        .build();
}

pub fn magic_missile_scroll(ecs: &mut World, x: i32, y: i32) {
    ecs.create_entity()
        .with(Position { x, y })
        .with(Renderable {
            glyph: rltk::to_cp437(')'),
            fg: RGB::named(rltk::CYAN),
            bg: RGB::named(rltk::BLACK),
            render_order: 2,
        })
        .with(Name {
            name: "Magic Missile Scroll".to_string(),
        })
        .with(Item {})
        .with(Consumable {})
        .with(Ranged { range: 6 })
        .with(InflictsDamage { damage: 20 })
        .marked::<SimpleMarker<SerializeMe>>()
        .build();
}

pub fn fireball_scroll(ecs: &mut World, x: i32, y: i32) {
    ecs.create_entity()
        .with(Position { x, y })
        .with(Renderable {
            glyph: rltk::to_cp437(')'),
            fg: RGB::named(rltk::ORANGE),
            bg: RGB::named(rltk::BLACK),
            render_order: 2,
        })
        .with(Name {
            name: "Fireball Scroll".to_string(),
        })
        .with(Item {})
        .with(Consumable {})
        .with(Ranged { range: 6 })
        .with(InflictsDamage { damage: 20 })
        .with(AreaOfEffect { radius: 3 })
        .marked::<SimpleMarker<SerializeMe>>()
        .build();
}

pub fn confusion_scroll(ecs: &mut World, x: i32, y: i32) {
    ecs.create_entity()
        .with(Position { x, y })
        .with(Renderable {
            glyph: rltk::to_cp437(')'),
            fg: RGB::named(rltk::PINK),
            bg: RGB::named(rltk::BLACK),
            render_order: 2,
        })
        .with(Name {
            name: "Confusion Scroll".to_string(),
        })
        .with(Item {})
        .with(Consumable {})
        .with(Ranged { range: 6 })
        .with(Confusion { turns: 4 })
        .marked::<SimpleMarker<SerializeMe>>()
        .build();
}

pub fn room_table(map_depth: i32) -> RandomTable {
    RandomTable::new()
        .add("Goblin", 10)
        .add("Orc", 1 + map_depth)
        .add("Health Potion", 7)
        .add("Fireball Scroll", 2 + map_depth)
        .add("Confusion Scroll", 2 + map_depth)
        .add("Magic Missile Scroll", 4)
}