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use std::collections::HashMap;
use serde_json::{json, Value};
use crate::{
Pos,
Template,
PResult,
perr
};
pub struct SaveState {
pub changes: HashMap<Pos, Vec<Template>>
}
impl SaveState {
pub fn new() -> Self {
Self {
changes: HashMap::new()
}
}
pub fn to_json(&self) -> Value {
json!({
"changes": self.changes.iter().map(
|(pos, templates)|
(pos, templates.iter().map(|t| t.to_json()).collect())
).collect::<Vec<(&Pos, Vec<Value>)>>()
})
}
pub fn from_json(val: &Value) -> PResult<Self> {
let mut changes = HashMap::new();
for v in val.get("changes").ok_or(perr!("save does not have changes"))?.as_array().ok_or(perr!("changes not an array"))? {
let pos = Pos::from_json(v.get(0).ok_or(perr!("change does not have index 0"))?).ok_or(perr!("change index 0 is not a pos"))?;
let mut templates = Vec::new();
for t in v.get(1).ok_or(perr!("change does not have index 1"))?.as_array().ok_or(perr!("change index 1 not an array"))? {
templates.push(Template::from_json(t)?);
}
changes.insert(pos, templates);
}
Ok(Self {changes})
}
}
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