use regex::Regex;

/// Format commit message with conventional commit format
pub fn format_conventional_commit(
    commit_type: &str,
    scope: Option<&str>,
    description: &str,
    body: Option<&str>,
    footer: Option<&str>,
    breaking: bool,
) -> String {
    let mut message = String::new();

    message.push_str(commit_type);
    if let Some(s) = scope {
        message.push_str(&format!("({})", s));
    }
    if breaking {
        message.push('!');
    }
    message.push_str(&format!(": {}", description));

    if let Some(b) = body {
        message.push_str(&format!("\n\n{}", b));
    }

    if let Some(f) = footer {
        message.push_str(&format!("\n\n{}", f));
    }

    message
}

/// Format commit with @commitlint format
pub fn format_commitlint_commit(
    commit_type: &str,
    scope: Option<&str>,
    subject: &str,
    body: Option<&str>,
    footer: Option<&str>,
    references: Option<&[&str]>,
) -> String {
    let mut message = String::new();

    message.push_str(commit_type);
    if let Some(s) = scope {
        message.push_str(&format!("({})", s));
    }
    message.push_str(&format!(": {}", subject));

    if let Some(refs) = references {
        for reference in refs {
            message.push_str(&format!(" #{}", reference));
        }
    }

    if let Some(b) = body {
        message.push_str(&format!("\n\n{}", b));
    }

    if let Some(f) = footer {
        message.push_str(&format!("\n\n{}", f));
    }

    message
}

/// Wrap text at specified width
pub fn wrap_text(text: &str, width: usize) -> String {
    textwrap::fill(text, width)
}

/// Clean commit message (remove comments, extra whitespace)
pub fn clean_message(message: &str) -> String {
    let comment_regex = Regex::new(r"^#.*$").unwrap();

    message
        .lines()
        .filter(|line| !comment_regex.is_match(line.trim()))
        .collect::<Vec<_>>()
        .join("\n")
        .trim()
        .to_string()
}

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

    #[test]
    fn test_format_conventional_commit() {
        let msg = format_conventional_commit(
            "feat",
            Some("auth"),
            "add login functionality",
            Some("This adds OAuth2 login support."),
            Some("Closes #123"),
            false,
        );

        assert!(msg.contains("feat(auth): add login functionality"));
        assert!(msg.contains("This adds OAuth2 login support."));
        assert!(msg.contains("Closes #123"));
    }

    #[test]
    fn test_format_conventional_commit_breaking() {
        let msg = format_conventional_commit(
            "feat",
            None,
            "change API response format",
            None,
            Some("BREAKING CHANGE: response format changed"),
            true,
        );

        assert!(msg.starts_with("feat!: change API response format"));
    }
}