mod buffer;
pub use self::buffer::Buffer;

use std::env;
use std::fs::File;
use std::io::BufReader;
use std::io::prelude::*;
use std::io;
use nom::bytes::complete::{tag, take_while, take_till};
use nom::character::complete::one_of;
use nom::sequence::Tuple;
use nom::branch::alt;
use nom::error::ErrorKind;
use nom::error::Error;

const FILE : &'static str = "test";

enum Address {
    Actual,
    Last,
    Line(u32),
    FromStartTo(u32),
    FromToEnd(u32),
    FromTo(u32, u32),
    Null,
}

enum Command {
    Append(Address),
    Insert(Address),
    Change(Address),
    Delete(Address),
    // bool pour check ou pas (e et E) TODO mettre le chemin vers le fichier
    Edit(bool),
    // TODO chemin vers fichier
    File(),
    // TODO
    Help,
    // TODO
    SetHelp,
    Join(Address),
    // TODO nom de la marque
    Mark(Address),
    List(Address),
    // TODO
    Move(Address),
    Number(Address),
    Print(Address),
    Prompt,
    // bool pour check ou pas (q et Q)
    Quit(bool),
    // TODO
    Read,
    // TODO
    Substitute,
    // TODO
    CopyLines,
    Undo,
    // TODO 
    Write,
    // TODO
    Line,
    // TODO
    ShellCommand,
    // TODO
    Null,
    // TODO
    Global,
    // TODO
    NonMatched,
}

/*
 * .
 * $
 * [:digit:]
 * '[:alpha:]
 * /BRE/
 * +[:digit:]
 * -[:digit:]
 * [:digit:],[:digit:]
 * [:digit:];[:digit:]
 */

// TODO juste $ pour l'instant dans l'adresse
// TODO faire les commandes mais juste p pour l'instant

/*
fn read_address(input: &str) -> Result<&str, Address> {
     
}
*/

/*
 * Le char doit être une commande valide.
 */

fn parse_without_addr(c: char) -> Command {
    Command::Help
}

fn parse_with_addr(c: char, addr: Address) -> Command {
    match c {
        'p' => Command::Print(addr),
        'n' => Command::Number(addr),
        _ => Command::Help,
    }
}

fn parse_command(c: char, addr: Option<Address>) -> Command {
    if let Some(a) = addr {
        parse_with_addr(c, a)
    } else {
        parse_without_addr(c)
    }
}

/*
fn parse_multi_addr(addr: &str) -> Address {
    //let extract = take_till::<&str, &str, Error>(|c| c == ',');
    let extract = take_till::<&str, &str, Error<&str>>(|c| c != ",");
    if let Ok((still, before)) = extract(addr) {
        if let Ok((still, after)) = extract(addr) {
        }
    }

    Address::Null
}
*/

fn parse_address(addr: &str) -> Address {
    let mut tmp = String::from(addr);
    tmp.retain(|c| c != ' ');
    let addr = tmp.as_str();

    if addr.is_empty() {
        Address::Actual
    } else {
        match addr {
            "." => Address::Actual,
            "$" => Address::Last,
            _ => Address::Null,
        }
    }
}

fn check_address(c: char) -> bool {
    c.is_digit(10) || c == '$' || c == ' ' || c == '.'
}

fn check_address_complete(c: char) -> bool {
    check_address(c) || c == ','
}

fn print(buffer: Buffer, addr: Address, print_numbers: bool) {
    match addr {
        Address::Actual => buffer.print_line(buffer.act(), print_numbers),
        Address::Null => println!("nul !"),
        _ => println!("coucou2"),
    }
}

fn execute_command(buffer: Buffer, c: Command) {
    match c {
        Command::Print(a) => print(buffer, a, false),
        Command::Number(a) => print(buffer, a, true),
        _ => println!("coucou"),
    }
}

fn parse_line(input: &str) -> Result<Command, String> {
    let address = take_while(check_address_complete);
    let command = one_of::<_, _, (&str, ErrorKind)>("pn");

    //if let Ok((input, (a, c))) = alt(address, command).parse(input) {
    if let Ok((input, (a, c))) = (address, command).parse(input) {
        //println!("{:?} - {:?} - {:?}", input, a, c);
        let addr = parse_address(a);
        Ok(parse_command(c, Some(addr)))
    } else {
        Err(String::from("bruh moment"))
    }
}

fn main() {
    let buffer : Vec<Result<String, io::Error>> = if let Ok(f) = File::open(FILE) {
        let buff = BufReader::new(f);
        buff.lines().collect()
    } else {
        panic!("Le fichier n'existe pas.");
    };

    let buffer_struct = Buffer::new(buffer);

    println!("fichier lu !");

    let mut input = String::new();
    match io::stdin().read_line(&mut input) {
        Ok(n) => {
            if let Ok(c) = parse_line(&input) {
                execute_command(buffer_struct, c);
            } else {
                println!("coucou");
            }
        },
        Err(e) => println!("error"),
    }
}