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

use assert_cmd::prelude::*;
use predicates::prelude::*;
use std::io::Write;
use std::process::Command;
use tempfile::NamedTempFile;

// Integration tests for the diffutils command

#[test]
fn unknown_param() -> Result<(), Box<dyn std::error::Error>> {
    let mut cmd = Command::cargo_bin("diffutils")?;
    cmd.arg("--foobar");
    cmd.assert()
        .code(predicate::eq(2))
        .failure()
        .stderr(predicate::str::starts_with("Usage: "));
    Ok(())
}

#[test]
fn cannot_read_from_file() -> Result<(), Box<dyn std::error::Error>> {
    let mut cmd = Command::cargo_bin("diffutils")?;
    cmd.arg("foo.txt").arg("bar.txt");
    cmd.assert()
        .code(predicate::eq(2))
        .failure()
        .stderr(predicate::str::starts_with("Failed to read from-file"));
    Ok(())
}

#[test]
fn cannot_read_to_file() -> Result<(), Box<dyn std::error::Error>> {
    let file = NamedTempFile::new()?;
    let mut cmd = Command::cargo_bin("diffutils")?;
    cmd.arg(file.path()).arg("bar.txt");
    cmd.assert()
        .code(predicate::eq(2))
        .failure()
        .stderr(predicate::str::starts_with("Failed to read to-file"));
    Ok(())
}

#[test]
fn no_differences() -> Result<(), Box<dyn std::error::Error>> {
    let file = NamedTempFile::new()?;
    for option in ["", "-u", "-c", "-e"] {
        let mut cmd = Command::cargo_bin("diffutils")?;
        if !option.is_empty() {
            cmd.arg(option);
        }
        cmd.arg(file.path()).arg(file.path());
        cmd.assert()
            .code(predicate::eq(0))
            .success()
            .stdout(predicate::str::is_empty());
    }
    Ok(())
}

#[test]
fn no_differences_report_identical_files() -> Result<(), Box<dyn std::error::Error>> {
    // same file
    let mut file1 = NamedTempFile::new()?;
    file1.write_all("foo\n".as_bytes())?;
    for option in ["", "-u", "-c", "-e"] {
        let mut cmd = Command::cargo_bin("diffutils")?;
        if !option.is_empty() {
            cmd.arg(option);
        }
        cmd.arg("-s").arg(file1.path()).arg(file1.path());
        cmd.assert()
            .code(predicate::eq(0))
            .success()
            .stdout(predicate::eq(format!(
                "Files {} and {} are identical\n",
                file1.path().to_string_lossy(),
                file1.path().to_string_lossy(),
            )));
    }
    // two files with the same content
    let mut file2 = NamedTempFile::new()?;
    file2.write_all("foo\n".as_bytes())?;
    for option in ["", "-u", "-c", "-e"] {
        let mut cmd = Command::cargo_bin("diffutils")?;
        if !option.is_empty() {
            cmd.arg(option);
        }
        cmd.arg("-s").arg(file1.path()).arg(file2.path());
        cmd.assert()
            .code(predicate::eq(0))
            .success()
            .stdout(predicate::eq(format!(
                "Files {} and {} are identical\n",
                file1.path().to_string_lossy(),
                file2.path().to_string_lossy(),
            )));
    }
    Ok(())
}

#[test]
fn differences() -> Result<(), Box<dyn std::error::Error>> {
    let mut file1 = NamedTempFile::new()?;
    file1.write_all("foo\n".as_bytes())?;
    let mut file2 = NamedTempFile::new()?;
    file2.write_all("bar\n".as_bytes())?;
    for option in ["", "-u", "-c", "-e"] {
        let mut cmd = Command::cargo_bin("diffutils")?;
        if !option.is_empty() {
            cmd.arg(option);
        }
        cmd.arg(file1.path()).arg(file2.path());
        cmd.assert()
            .code(predicate::eq(1))
            .failure()
            .stdout(predicate::str::is_empty().not());
    }
    Ok(())
}

#[test]
fn differences_brief() -> Result<(), Box<dyn std::error::Error>> {
    let mut file1 = NamedTempFile::new()?;
    file1.write_all("foo\n".as_bytes())?;
    let mut file2 = NamedTempFile::new()?;
    file2.write_all("bar\n".as_bytes())?;
    for option in ["", "-u", "-c", "-e"] {
        let mut cmd = Command::cargo_bin("diffutils")?;
        if !option.is_empty() {
            cmd.arg(option);
        }
        cmd.arg("-q").arg(file1.path()).arg(file2.path());
        cmd.assert()
            .code(predicate::eq(1))
            .failure()
            .stdout(predicate::eq(format!(
                "Files {} and {} differ\n",
                file1.path().to_string_lossy(),
                file2.path().to_string_lossy()
            )));
    }
    Ok(())
}

#[test]
fn missing_newline() -> Result<(), Box<dyn std::error::Error>> {
    let mut file1 = NamedTempFile::new()?;
    file1.write_all("foo".as_bytes())?;
    let mut file2 = NamedTempFile::new()?;
    file2.write_all("bar".as_bytes())?;
    let mut cmd = Command::cargo_bin("diffutils")?;
    cmd.arg("-e").arg(file1.path()).arg(file2.path());
    cmd.assert()
        .code(predicate::eq(2))
        .failure()
        .stderr(predicate::str::starts_with("No newline at end of file"));
    Ok(())
}