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// Copyright 2016 Kitware, Inc.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use impl_prelude::*;

#[derive(Debug, Default, Clone, Copy)]
/// Check for files which lack an end-of-line at the end of the file.
pub struct CheckEndOfLine;

impl CheckEndOfLine {
    /// Create a new check to check for end-of-lines at the end of files.
    pub fn new() -> Self {
        CheckEndOfLine
    }
}

impl ContentCheck for CheckEndOfLine {
    fn name(&self) -> &str {
        "check-end-of-line"
    }

    fn check(&self, _: &CheckGitContext, content: &Content) -> Result<CheckResult> {
        let mut result = CheckResult::new();

        for diff in content.diffs() {
            match diff.status {
                StatusChange::Added |
                StatusChange::Modified(_) => (),
                _ => continue,
            }

            // Ignore symlinks; they only end with newlines if they point to a file with a newline
            // at the end of its name.
            if diff.new_mode == "120000" {
                continue;
            }

            // FIXME: does this work for binary files?
            let patch = match content.path_diff(&diff.name) {
                Ok(s) => s,
                Err(err) => {
                    result.add_alert(format!("{}failed to get the diff for file `{}`: {}",
                                             commit_prefix(content),
                                             diff.name,
                                             err),
                                     true);
                    continue;
                },
            };

            let has_missing_newline = patch.lines()
                .last()
                .map_or(false, |line| line == "\\ No newline at end of file");

            if has_missing_newline {
                result.add_error(format!("{}missing newline at the end of file in `{}`.",
                                         commit_prefix_str(content, "is not allowed;"),
                                         diff.name));
            }
        }

        Ok(result)
    }
}

#[cfg(test)]
mod tests {
    use checks::CheckEndOfLine;
    use checks::test::*;

    const BAD_COMMIT: &str = "829cdf8cb069b8f8a634a034d3f85089271601cf";
    const FIX_COMMIT: &str = "767dd1c173175d85e0f7de23dcd286f5a83617b1";

    #[test]
    fn test_check_end_of_line() {
        let check = CheckEndOfLine::new();
        let result = run_check("test_check_end_of_line", BAD_COMMIT, check);
        test_result_errors(result, &[
            "commit 829cdf8cb069b8f8a634a034d3f85089271601cf is not allowed; missing newline at \
             the end of file in `missing-newline-eof`.",
        ]);
    }

    #[test]
    fn test_check_end_of_line_topic() {
        let check = CheckEndOfLine::new();
        let result = run_topic_check("test_check_end_of_line_topic", BAD_COMMIT, check);
        test_result_errors(result, &[
            "missing newline at the end of file in `missing-newline-eof`.",
        ]);
    }

    #[test]
    fn test_check_end_of_line_removal() {
        let check = CheckEndOfLine::new();
        let conf = make_check_conf(&check);

        let result = test_check_base("test_check_end_of_line_removal",
                                     FIX_COMMIT,
                                     BAD_COMMIT,
                                     &conf);
        test_result_ok(result);
    }

    #[test]
    fn test_check_end_of_line_topic_fixed() {
        let check = CheckEndOfLine::new();
        run_topic_check_ok("test_check_end_of_line_topic_fixed", FIX_COMMIT, check);
    }
}