//  * This file is part of the uutils coreutils package.
//  *
//  * For the full copyright and license information, please view the LICENSE
//  * file that was distributed with this source code.

// spell-checker:ignore (words) RFILE

use crate::common::util::*;
use std::io::{Seek, SeekFrom, Write};

static FILE1: &str = "truncate_test_1";
static FILE2: &str = "truncate_test_2";

#[test]
fn test_increase_file_size() {
    let expected = 5 * 1024;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE1);
    ucmd.args(&["-s", "+5K", FILE1]).succeeds();

    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_increase_file_size_kb() {
    let expected = 5 * 1000;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE1);
    ucmd.args(&["-s", "+5KB", FILE1]).succeeds();

    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_reference() {
    let expected = 5 * 1000;
    let scene = TestScenario::new(util_name!());
    let at = &scene.fixtures;
    let mut file = at.make_file(FILE2);

    // manpage: "A FILE argument that does not exist is created."
    // TODO: 'truncate' does not create the file in this case,
    //        but should because '--no-create' wasn't specified.
    at.touch(FILE1); // TODO: remove this when 'no-create' is fixed
    scene.ucmd().arg("-s").arg("+5KB").arg(FILE1).succeeds();

    scene
        .ucmd()
        .arg("--reference")
        .arg(FILE1)
        .arg(FILE2)
        .succeeds();

    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_decrease_file_size() {
    let expected = 6;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size=-4", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_space_in_size() {
    let expected = 4;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", " 4", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_failed() {
    new_ucmd!().fails();
}

#[test]
fn test_failed_2() {
    let (_at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&[FILE1]).fails();
}

#[test]
fn test_failed_incorrect_arg() {
    let (_at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["-s", "+5A", FILE1]).fails();
}

#[test]
fn test_at_most_shrinks() {
    let expected = 4;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", "<4", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_at_most_no_change() {
    let expected = 10;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", "<40", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_at_least_grows() {
    let expected = 15;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", ">15", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_at_least_no_change() {
    let expected = 10;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", ">4", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_round_down() {
    let expected = 8;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", "/4", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_round_up() {
    let expected = 12;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file = at.make_file(FILE2);
    file.write_all(b"1234567890").unwrap();
    ucmd.args(&["--size", "%4", FILE2]).succeeds();
    file.seek(SeekFrom::End(0)).unwrap();
    let actual = file.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_size_and_reference() {
    let expected = 15;
    let (at, mut ucmd) = at_and_ucmd!();
    let mut file1 = at.make_file(FILE1);
    let mut file2 = at.make_file(FILE2);
    file1.write_all(b"1234567890").unwrap();
    ucmd.args(&["--reference", FILE1, "--size", "+5", FILE2])
        .succeeds();
    file2.seek(SeekFrom::End(0)).unwrap();
    let actual = file2.seek(SeekFrom::Current(0)).unwrap();
    assert!(
        expected == actual,
        "expected '{}' got '{}'",
        expected,
        actual
    );
}

#[test]
fn test_error_filename_only() {
    // truncate: you must specify either '--size' or '--reference'
    new_ucmd!().args(&["file"]).fails().stderr_contains(
        "error: The following required arguments were not provided:
    --reference <RFILE>
    --size <SIZE>",
    );
}

#[test]
fn test_invalid_numbers() {
    new_ucmd!()
        .args(&["-s", "0X", "file"])
        .fails()
        .stderr_contains("Invalid number: '0X'");
    new_ucmd!()
        .args(&["-s", "0XB", "file"])
        .fails()
        .stderr_contains("Invalid number: '0XB'");
    new_ucmd!()
        .args(&["-s", "0B", "file"])
        .fails()
        .stderr_contains("Invalid number: '0B'");
}

#[test]
fn test_reference_file_not_found() {
    new_ucmd!()
        .args(&["-r", "a", "b"])
        .fails()
        .stderr_contains("cannot stat 'a': No such file or directory");
}

#[test]
fn test_reference_with_size_file_not_found() {
    new_ucmd!()
        .args(&["-r", "a", "-s", "+1", "b"])
        .fails()
        .stderr_contains("cannot stat 'a': No such file or directory");
}

#[test]
fn test_truncate_bytes_size() {
    // TODO: this should succeed without error, uncomment when '--no-create' is fixed
    // new_ucmd!()
    //     .args(&["--no-create", "--size", "K", "file"])
    //     .succeeds();
    new_ucmd!()
        .args(&["--size", "1024R", "file"])
        .fails()
        .code_is(1)
        .stderr_only("truncate: Invalid number: '1024R'");
    #[cfg(not(target_pointer_width = "128"))]
    new_ucmd!()
        .args(&["--size", "1Y", "file"])
        .fails()
        .code_is(1)
        .stderr_only("truncate: Invalid number: '1Y': Value too large for defined data type");
    #[cfg(target_pointer_width = "32")]
    {
        let sizes = ["1000G", "10T"];
        for size in &sizes {
            new_ucmd!()
                .args(&["--size", size, "file"])
                .fails()
                .code_is(1)
                .stderr_only(format!(
                    "truncate: Invalid number: '{}': Value too large for defined data type",
                    size
                ));
        }
    }
}

/// Test that truncating a non-existent file creates that file.
#[test]
fn test_new_file() {
    let (at, mut ucmd) = at_and_ucmd!();
    let filename = "new_file_that_does_not_exist_yet";
    ucmd.args(&["-s", "8", filename])
        .succeeds()
        .no_stdout()
        .no_stderr();
    assert!(at.file_exists(filename));
    assert_eq!(at.read_bytes(filename), vec![b'\0'; 8]);
}

/// Test for not creating a non-existent file.
#[test]
fn test_new_file_no_create() {
    let (at, mut ucmd) = at_and_ucmd!();
    let filename = "new_file_that_does_not_exist_yet";
    ucmd.args(&["-s", "8", "-c", filename])
        .succeeds()
        .no_stdout()
        .no_stderr();
    assert!(!at.file_exists(filename));
}

#[test]
fn test_division_by_zero_size_only() {
    new_ucmd!()
        .args(&["-s", "/0", "file"])
        .fails()
        .no_stdout()
        .stderr_contains("division by zero");
    new_ucmd!()
        .args(&["-s", "%0", "file"])
        .fails()
        .no_stdout()
        .stderr_contains("division by zero");
}

#[test]
fn test_division_by_zero_reference_and_size() {
    let (at, mut ucmd) = at_and_ucmd!();
    at.make_file(FILE1);
    ucmd.args(&["-r", FILE1, "-s", "/0", "file"])
        .fails()
        .no_stdout()
        .stderr_contains("division by zero");

    let (at, mut ucmd) = at_and_ucmd!();
    at.make_file(FILE1);
    ucmd.args(&["-r", FILE1, "-s", "%0", "file"])
        .fails()
        .no_stdout()
        .stderr_contains("division by zero");
}

/// Test that truncate with a relative size less than 0 is not an error.
#[test]
fn test_underflow_relative_size() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["-s-1", FILE1])
        .succeeds()
        .no_stdout()
        .no_stderr();
    assert!(at.file_exists(FILE1));
    assert!(at.read_bytes(FILE1).is_empty());
}