//! Replace the contents of the currently edited map with contents from a file.

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

/// Command to load a file from the disk and replace the current editor contents with it's info.
pub struct Edit {
    file: PathBuf,
}

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

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

impl Command for Edit {
    fn process(&self, editor: &mut Editor) -> Result<String, String> {
        let data = match MapData::load_from_file(&self.file) {
            Ok(data) => data,
            Err(err) => {
                return Err(format!(
                    "Unable to read file: {:?}, reason: {:?}",
                    &self.file, err
                ))
            }
        };

        editor.map_mut().set_data(data);
        Ok(format!("Map data from {:?} loaded.", &self.file))
    }
}