use std::collections::HashMap;

use crate::{entity::{Location, EntityId}, site::Site};

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

pub struct WorldCell {
    pub terrain: Terrain,
}

pub struct World {
    pub map: Vec<Vec<WorldCell>>,
    pub size: usize,
    pub sites: HashMap<Location, Site>
}

impl WorldCell {
    pub fn new(terrain: Terrain) -> WorldCell {
        WorldCell {
            terrain: terrain,
        }
    }
}

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,
            sites: HashMap::new(),
        }
    }

    pub fn add_site(&mut self, mut site: Site) -> EntityId{
        let id = self.sites.len() as EntityId;
        site.entity.id = id;
        self.sites.insert(site.entity.loc, site);
        return id;
    }


    pub fn get_site_location(&self, site_id: EntityId) -> Location {
        for (loc, site) in self.sites.iter() {
            if site.entity.id == site_id {
                return *loc;
            }
        }
        panic!("Town not found");
    }

    pub fn get_site_at(&self, pos: Location) -> Option<&Site> {
        return self.sites.get(&pos);
    }

}

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],
        }
    }
}