mod area_starting_points;
mod bsp_dungeon;
mod bsp_interior;
mod cellular_automata;
mod common;
mod cull_unreachable;
mod distant_exit;
mod dla;
mod drunkard;
mod maze;
mod prefab_builder;
mod room_based_spawner;
mod room_based_stairs;
mod room_based_starting_position;
mod simple_map;
mod voronoi;
mod voronoi_spawning;
mod waveform_collapse;

use ::rltk::RandomNumberGenerator;
use area_starting_points::{AreaStartingPosition, XStart, YStart};
use bsp_dungeon::BspDungeonBuilder;
use bsp_interior::BspInteriorBuilder;
use cellular_automata::CellularAutomataBuilder;
use common::*;
use cull_unreachable::CullUnreachable;
use distant_exit::DistantExit;
use dla::DLABuilder;
use drunkard::DrunkardsWalkBuilder;
use maze::MazeBuilder;
use prefab_builder::PrefabBuilder;
use room_based_spawner::RoomBasedSpawner;
use room_based_stairs::RoomBasedStairs;
use room_based_starting_position::RoomBasedStartingPosition;
use simple_map::SimpleMapBuilder;
use specs::prelude::*;
use voronoi::VoronoiCellBuilder;
use voronoi_spawning::VoronoiSpawning;
use waveform_collapse::WaveformCollapseBuilder;

use crate::{spawner, Map, Position, Rect, SHOW_MAPGEN_VISUALIZER};

pub struct BuilderMap {
    pub spawn_list: Vec<(usize, String)>,
    pub map: Map,
    pub starting_position: Option<Position>,
    pub rooms: Option<Vec<Rect>>,
    pub history: Vec<Map>,
}

impl BuilderMap {
    fn new(new_depth: i32) -> BuilderMap {
        BuilderMap {
            spawn_list: Vec::new(),
            map: Map::new(new_depth),
            starting_position: None,
            rooms: None,
            history: Vec::new(),
        }
    }

    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);
        }
    }
}

pub struct BuilderChain {
    starter: Option<Box<dyn InitialMapBuilder>>,
    builders: Vec<Box<dyn MetaMapBuilder>>,
    pub build_data: BuilderMap,
}

impl BuilderChain {
    pub fn new(new_depth: i32) -> BuilderChain {
        BuilderChain {
            starter: None,
            builders: Vec::new(),
            build_data: BuilderMap::new(new_depth),
        }
    }

    pub fn start_with(&mut self, starter: Box<dyn InitialMapBuilder>) -> &mut Self {
        match self.starter {
            None => self.starter = Some(starter),
            Some(_) => panic!("You can only have one starting builder."),
        }

        self
    }

    pub fn with(&mut self, metabuilder: Box<dyn MetaMapBuilder>) -> &mut Self {
        self.builders.push(metabuilder);

        self
    }

    pub fn build_map(&mut self, rng: &mut RandomNumberGenerator) -> &mut Self {
        match &mut self.starter {
            None => panic!("Cannot run a map builder chain without starting a build system"),
            Some(starter) => {
                // Build the starting map
                starter.build_map(rng, &mut self.build_data);
            }
        }

        // Build additional layers in turn
        for metabuilder in self.builders.iter_mut() {
            metabuilder.build_map(rng, &mut self.build_data);
        }

        self
    }

    pub fn spawn_entities(&mut self, ecs: &mut World) -> &mut Self {
        for entity in self.build_data.spawn_list.iter() {
            spawner::spawn_entity(ecs, &(&entity.0, &entity.1));
        }

        self
    }

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

    pub fn get_starting_position(&self) -> Option<Position> {
        self.build_data.starting_position
    }

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

    pub fn get_spawn_list(&self) -> &Vec<(usize, String)> {
        &self.build_data.spawn_list
    }
}

pub trait InitialMapBuilder {
    fn build_map(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap);
}

pub trait MetaMapBuilder {
    fn build_map(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap);
}

pub trait MapBuilder {
    fn get_map(&self) -> Map;
    fn get_starting_position(&self) -> Position;
    fn get_snapshot_history(&self) -> Vec<Map>;
    fn build_map(&mut self);
    fn take_snapshot(&mut self);
    fn get_spawn_list(&self) -> &Vec<(usize, String)>;

    fn spawn_entities(&mut self, ecs: &mut World) {
        for entity in self.get_spawn_list().iter() {
            spawner::spawn_entity(ecs, &(&entity.0, &entity.1));
        }
    }
}

pub fn random_builder(new_depth: i32, rng: &mut RandomNumberGenerator) -> BuilderChain {
    let mut builder = BuilderChain::new(new_depth);
    builder
        .start_with(VoronoiCellBuilder::pythagoras())
        .with(WaveformCollapseBuilder::new())
        .with(AreaStartingPosition::new(XStart::Center, YStart::Center))
        .with(CullUnreachable::new())
        .with(VoronoiSpawning::new())
        .with(DistantExit::new());

    builder
}