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extern crate crypto;

use crypto::digest::Digest;
use crypto::sha2::Sha512;

use std::error::Error;
use std::fs;
use std::io;
use std::io::prelude::*;
use std::path::PathBuf;

pub mod validation;

pub trait Writeable {
    fn name(&self) -> &String;
    fn path(&self) -> &String;

    fn save(&self) -> Result<(), String> {
        let mut filename = Sha512::new();
        filename.input_str(self.name().as_str());

        let mut path = PathBuf::from(".tight");
        path.push(self.path());
        path.push(filename.result_str());

        let mut file = match fs::OpenOptions::new()
            .write(true)
            .create_new(true)
            .open(path.as_path()) {
                Ok(file) => file,
                Err(e) => return Err(String::from(e.description())),
            };

        match file.write(self.name().as_bytes()) {
            Ok(_) => Ok(()),
            Err(e) => Err(String::from(e.description())),
        }
    }
}

pub fn init() -> Result<(), io::Error> {
    fs::create_dir_all(".tight/expense")?;
    fs::create_dir_all(".tight/income")?;
    fs::create_dir_all(".tight/merchant")?;
    fs::create_dir_all(".tight/source")?;
    fs::create_dir_all(".tight/category")?;
    fs::create_dir_all(".tight/transfermethod")?;

    Ok(())
}

#[derive(Debug)]
pub struct Merchant {
    pub name: String,
    path: String,
}

impl Merchant {
    pub fn new(name: &str) -> Merchant {
        Merchant {
            name: String::from(name),
            path: String::from("merchant"),
        }
    }
}

impl Writeable for Merchant {
    fn name(&self) -> &String {
        &self.name
    }

    fn path(&self) -> &String {
        &self.path
    }
}