use super::MapBuilder;
use crate::{components::Position, spawner, Map, TileType, SHOW_MAPGEN_VISUALIZER};
use rltk::RandomNumberGenerator;
use specs::prelude::*;
use std::collections::HashMap;

pub struct DrunkardsWalkBuilder {
    map: Map,
    starting_position: Position,
    depth: i32,
    history: Vec<Map>,
    noise_areas: HashMap<i32, Vec<usize>>,
}

impl MapBuilder for DrunkardsWalkBuilder {
    fn build_map(&mut self) {
        self.build();
    }

    fn spawn_entities(&mut self, ecs: &mut World) {
        for area in self.noise_areas.iter() {
            spawner::spawn_region(ecs, area.1, self.depth);
        }
    }

    fn get_map(&self) -> Map {
        self.map.clone()
    }

    fn get_starting_position(&self) -> Position {
        self.starting_position
    }

    fn get_snapshot_history(&self) -> Vec<Map> {
        self.history.clone()
    }

    fn take_snapshot(&mut self) {
        if SHOW_MAPGEN_VISUALIZER {
            let mut snapshot = self.map.clone();
            for v in snapshot.revealed_tiles.iter_mut() {
                *v = true;
            }
            self.history.push(snapshot);
        }
    }
}

impl DrunkardsWalkBuilder {
    pub fn new(new_depth: i32) -> DrunkardsWalkBuilder {
        DrunkardsWalkBuilder {
            map: Map::new(new_depth),
            starting_position: Position::default(),
            depth: new_depth,
            history: Vec::new(),
            noise_areas: HashMap::new(),
        }
    }

    #[allow(clippy::map_entry)]
    fn build(&mut self) {
        // let mut rng = RandomNumberGenerator::new();

        // Set a central starting point
        self.starting_position = Position {
            x: self.map.width / 2,
            y: self.map.height / 2,
        };
        let start_idx = self
            .map
            .xy_idx(self.starting_position.x, self.starting_position.y);
        self.map.tiles[start_idx] = TileType::Floor;

        // @TODO implement the rest
    }
}