//! Save the contents of the map to disk

use super::Command;
use super::{CmdParseError, FromArgs};
use crate::map::MapData;
use crate::Editor;
use std::path::PathBuf;

/// The save command can take any destination in the filesystem the user can write to. Processing
/// will then save the map contents to that destination, overwriting anything that may be there.
pub struct Save {
    destination: PathBuf,
}

impl FromArgs for Save {
    fn from_args(args: &[&str]) -> Result<Self, CmdParseError> {
        if args.len() != 1 {
            return Err(CmdParseError::WrongNumberOfArgs(args.len(), 1..=1));
        }

        Ok(Self {
            destination: PathBuf::from(args[0]),
        })
    }
}

impl Command for Save {
    fn process(&self, editor: &mut Editor) -> Result<String, String> {
        let data = MapData::extract_data(editor.map());

        match data.write_to_file(&self.destination) {
            Ok(_) => Ok(format!(
                "Successfully wrote contents to `{:?}`",
                &self.destination
            )),
            Err(e) => Err(format!(
                "Unable to write to `{:?}`. Error: {:?}",
                &self.destination, e
            )),
        }
    }
}