//! Read the contents of a file and add it to the currently edited map.

use super::Command;
use super::{CmdParseError, FromArgs};
use crate::client::Editor;
use crate::net::Cargo;
use crate::world::World;
use std::path::PathBuf;

/// Command to read a file from the system
pub struct Read {
    file: PathBuf,
}

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

        // Send all components of the file to the server.
        for (_, icon) in world.icons().iter() {
            editor.server().send(Cargo::AddIcon(icon.clone()));
        }
        for (_, room) in world.rooms().iter() {
            editor.server().send(Cargo::AddRoom(room.clone()));
        }
        for (_, wall) in world.walls().iter() {
            editor.server().send(Cargo::AddWall(wall.clone()));
        }

        Ok(format!(
            "Map data from {:?} read and added to the current buffer.",
            &self.file
        ))
    }
}