use std::rc::Rc;
use rand::prelude::*;

use crate::generators::TownNameGenerator;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Terrain {
    Void,
    DeepOcean,
    Ocean,
    Beach,
    Flats,
    Hills,
    Mountains,
    HighMountains,
}

pub struct Town {
    pub name: String,
    pub population: u32,
}

pub enum Structure {
    Town(Rc<Town>),
}

pub struct WorldCell {
    pub terrain: Terrain,
    pub structure: Option<Structure>,
}

pub struct World {
    pub map: Vec<Vec<WorldCell>>,
    pub size: usize,
}

impl WorldCell {
    pub fn new(terrain: Terrain) -> WorldCell {
        WorldCell {
            terrain: terrain,
            structure: None,
        }
    }
}

impl World {
    pub fn new(size: usize) -> World {
        let mut map = Vec::new();
        for _ in 0..size {
            let mut row = Vec::new();
            for _ in 0..size {
                row.push(WorldCell::new(Terrain::Void));
            }
            map.push(row);
        }
        World {
            map: map,
            size: size,
        }
    }

    pub fn add_structure(&mut self, x: usize, y: usize, structure: Structure) {
        self.map[x][y].structure = Some(structure);
    }
}

impl Terrain {
    pub fn from_height(height: f64) -> Terrain {
        if height < -2000.0 {
            Terrain::DeepOcean
        } else if height < 0.0 {
            Terrain::Ocean
        } else if height < 50.0 {
            Terrain::Beach
        } else if height < 1000.0 {
            Terrain::Flats
        } else if height < 2000.0 {
            Terrain::Hills
        } else if height < 3500.0 {
            Terrain::Mountains
        } else {
            Terrain::HighMountains
        }
    }

    pub fn to_color(self) -> [u8; 3] {
        match self {
            Terrain::Void => [0, 0, 0],
            Terrain::DeepOcean => [20, 60, 255],
            Terrain::Ocean => [20, 120, 255],
            Terrain::Beach => [255, 255, 100],
            Terrain::Flats => [0, 204, 0],
            Terrain::Hills => [102, 153, 0],
            Terrain::Mountains => [153, 153, 102],
            Terrain::HighMountains => [230, 230, 230],
        }
    }
}

impl Town {
    pub fn new() -> Town {
        let mut rng = rand::thread_rng();
        Town {
            name: TownNameGenerator::name(),
            population: rng.gen_range(100..500),
        }
    }
}