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use std::io;
use std::io::prelude::*;

use arret_runtime::binding::*;

use arret_runtime::boxed;
use arret_runtime::boxed::refs::Gc;
use arret_runtime::task::Task;

fn pretty_print_common(
    task: &mut Task,
    values: Gc<boxed::List<boxed::Any>>,
    output: &mut dyn Write,
) {
    for value in values.iter() {
        arret_runtime_syntax::writer::pretty_print_boxed(output, task, value);
    }
}

fn write_boxed_common(
    task: &mut Task,
    values: Gc<boxed::List<boxed::Any>>,
    output: &mut dyn Write,
) {
    let mut is_first = true;
    for value in values.iter() {
        if !is_first {
            output.write_all(&[b' ']).unwrap();
        }

        arret_runtime_syntax::writer::write_boxed(output, task, value).unwrap();
        is_first = false;
    }
}

#[arret_rfi_derive::rust_fun("(& Any ->! ())")]
pub fn stdlib_print(task: &mut Task, values: Gc<boxed::List<boxed::Any>>) {
    let stdout = io::stdout();
    let mut output = stdout.lock();

    pretty_print_common(task, values, &mut output);
}

#[arret_rfi_derive::rust_fun("(& Any ->! ())")]
pub fn stdlib_println(task: &mut Task, values: Gc<boxed::List<boxed::Any>>) {
    let stdout = io::stdout();
    let mut output = stdout.lock();

    pretty_print_common(task, values, &mut output);
    output.write_all(&[b'\n']).unwrap();
}

#[arret_rfi_derive::rust_fun("(& Any ->! ())")]
pub fn stdlib_write(task: &mut Task, values: Gc<boxed::List<boxed::Any>>) {
    let stdout = io::stdout();
    let mut output = stdout.lock();

    write_boxed_common(task, values, &mut output);
}

#[arret_rfi_derive::rust_fun("(& Any ->! ())")]
pub fn stdlib_writeln(task: &mut Task, values: Gc<boxed::List<boxed::Any>>) {
    let stdout = io::stdout();
    let mut output = stdout.lock();

    write_boxed_common(task, values, &mut output);
    output.write_all(&[b'\n']).unwrap();
}

#[arret_rfi_derive::rust_fun("(& Any -> Str)")]
pub fn stdlib_print_str(task: &mut Task, values: Gc<boxed::List<boxed::Any>>) -> Gc<boxed::Str> {
    let mut output: Vec<u8> = vec![];
    pretty_print_common(task, values, &mut output);

    boxed::Str::new(
        task,
        std::str::from_utf8(&output).expect("wrote invalid UTF-8"),
    )
}

#[arret_rfi_derive::rust_fun("(& Any -> Str)")]
pub fn stdlib_write_str(task: &mut Task, values: Gc<boxed::List<boxed::Any>>) -> Gc<boxed::Str> {
    let mut output: Vec<u8> = vec![];
    write_boxed_common(task, values, &mut output);

    boxed::Str::new(
        task,
        std::str::from_utf8(&output).expect("wrote invalid UTF-8"),
    )
}