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use std::path::{PathBuf};
use std::fs;
use serde_json;
use serde_json::Value;
use serde::Deserialize;
use crate::{
RoomId,
roomtemplate::RoomTemplate,
Result,
aerr,
Encyclopedia
};
pub struct WorldLoader {
pub directory: PathBuf
}
impl WorldLoader {
pub fn new(path: PathBuf) -> Self {
Self {
directory: path
}
}
pub fn load_world_meta(&self) -> Result<WorldMeta> {
let path = self.directory.join("world.json");
let text = fs::read_to_string(path)?;
let json: Value = serde_json::from_str(&text)?;
let default_room = RoomId::deserialize(
json.get("default_room").ok_or(aerr!("world meta does not have default_room"))?
).map_err(|e| aerr!("invalid roomid for default room: {}", e))?;
let encyclopediae =
json
.get("encyclopediae")
.ok_or(aerr!("world meta does not have encyclopediae"))?
.as_array()
.ok_or(aerr!("world meta encyclopediae is not a list"))?
.iter()
.map(|v| Ok(v
.as_str()
.ok_or(aerr!("world meta encyclopediae item {:?} is not a string", v))?
.to_string()
))
.collect::<Result<Vec<String>>>()?;
Ok(WorldMeta{
default_room,
encyclopediae
})
}
pub fn load_room(&self, id: RoomId) -> Result<RoomTemplate> {
let fname = id.to_string().splitn(2, '+').next().unwrap().to_string() + ".json";
let path = self.directory.join("maps").join(fname);
let text = fs::read_to_string(path)?;
let template = serde_json::from_str(&text)?;
Ok(template)
}
pub fn load_encyclopedia(&self, name: &str) -> Result<Encyclopedia> {
let fname: String = name.to_string() + ".json";
let encyclopedia: Encyclopedia =
serde_json::from_str(
&fs::read_to_string(
self.directory
.join("encyclopediae")
.join(&fname)
)?
).map_err(|e|aerr!("failed to load encyclopedia {}: {}", name, e))?;
encyclopedia.validate()?;
Ok(encyclopedia)
}
}
pub struct WorldMeta {
pub encyclopediae: Vec<String>,
pub default_room: RoomId
}
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