mod storage;
mod editor;


use storage::{Storage, Item};

use clap::{Parser, Subcommand};
use rpassword;

use std::io::{self, Write};
use std::process;


#[derive(Parser)]
#[command(name = "mps", version = "0.0.1", about = "MyPasswordStorage: Tool for storing your passwords locally with git synchronization")]
struct Cli {
    #[command(subcommand)]
    command: Option<Commands>,
}

#[derive(Subcommand)]
enum Commands {

    /// Initialization of storage and config, use this in first time of usage of mps
    Init,

    /// Lists all ids stored in db
    List,

    /// Show content of item
    Show {
        #[arg(value_name="item_id")]
        id: String
    },
    
    /// Adds new item with unique id to the db
    Add {
        #[arg(value_name="item_id")]
        id: String
    },

    /// Edit item content
    Edit {
        #[arg(value_name="item_id")]
        id: String
    }

}

enum PROMPT {
    YES,
    NO
}

fn get_prompt(question: &str) -> io::Result<PROMPT> {
    print!("{} [Y/n] ", question);
    io::stdout().flush()?;
    let mut input = String::new();
    io::stdin().read_line(&mut input)?;
    let input = input.trim().to_lowercase();
    match input.as_str() {
        "y" => Ok(PROMPT::YES),
        "yes" => Ok(PROMPT::YES),
        "n" => Ok(PROMPT::NO),
        "no" => Ok(PROMPT::NO),
        _ => Ok(PROMPT::YES),
    }

}

// TODO: change password functionality
// TODO: return storage inited
fn login() -> io::Result<String> {
    print!("Enter passphrase for storage: ");
    io::stdout().flush()?;
    // TODO: check in db
    // TODO: return error if db is not inited
    let password = rpassword::read_password()?;
    if password != "pass" {
        return Err(io::Error::new(io::ErrorKind::InvalidData, "Wrong passphrase"));
    }
    print!("\x1B[1A\x1B[2K");  // Move cursor up one line and clear that line
    io::stdout().flush()?;     // Ensure the changes are reflected immediately
    Ok(String::from(password))
}

fn init() -> io::Result<()> {
    if Storage::is_inited() {
        return Err(io::Error::new(io::ErrorKind::AlreadyExists, "Reinitialization attempted"));
    }
    print!("Enter passphrase for storage: ");
    io::stdout().flush()?;
    // TODO: rename to passphrase
    let password  = rpassword::read_password()?;
    print!("Reenter passphrase: ");
    io::stdout().flush()?;
    let password2 = rpassword::read_password()?;

    if password != password2 {
        return Err(io::Error::new(io::ErrorKind::InvalidInput, "Passwords must be equal"));
    }

    Storage::init(password)?;

    Ok(())
}

fn list() -> io:: Result<()> {
    // TODO: get storage from login
    let passphrase = login()?;
    let st = Storage::from_db(passphrase)?;
    for id in st.ids() {
        println!("{}", id);
    }
    Ok(())
}

fn add(id: &String) -> io::Result<()> {
    let passphrase = login()?;
    let mut st = Storage::from_db(passphrase)?;
    if st.contains(id) {
        // TODO: ask to edit existing in outer function which invoked this one
        return Err(io::Error::new(
            io::ErrorKind::InvalidInput,
            format!("Dublicate item id: {}. Item id's must be unique.", id)
            // TODO: ask to edit [Y/n]
        ))
    }

    let content = editor::open_to_edit()?;
    st.add(Item::from(id.clone(), content));
    st.dump()?;

    Ok(())
}

fn edit(id: &String) -> io::Result<()> {
    // TODO: implement
    Ok(())
} 

fn show(id: &String) -> io::Result<()> {
    let passphrase = login()?;                                                                                                                              
    let mut st = Storage::from_db(passphrase)?;
    if !st.contains(id) {
        return Err(io::Error::new(
            io::ErrorKind::InvalidInput,
            format!("Can`t find id: {}", id)
        ));
    }

    let item = st.get(id);
    editor::open_to_show(&item.content)?;
    Ok(())
}

fn run_command() -> io::Result<()> {
    let cli = Cli::parse();
    match &cli.command {
        Some(Commands::Init) => {
            init()?;
        }
        Some(Commands::List) => {
            list()?;
        }
        Some(Commands::Show { id }) => {
            show(id)?;
        }
        Some(Commands::Add { id }) => {
            add(id)?;
        }
        Some(Commands::Edit { id }) => {
            edit(id)?
        }
        None => {
            if !Storage::is_inited() {
                match get_prompt("Do you want to init your storage?")? {
                    PROMPT::YES => init()?,
                    PROMPT::NO => Storage::print_init_hint(),
                }
            } else {
                list()?
            }
        }
    }
    Ok(())
}

fn main() {
    match run_command() {
        Ok(()) => return,
        Err(e) => {
            println!("{}", e);
            process::exit(2); // TODO: better codes for different errors
        }
    }
}