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use colored::*;
use regex::RegexSet;
use nom::IResult;
use std::path::PathBuf;

/// Given a darcs boring file's contents, process it as a `RegexSet`. The second
/// argument is a file path, included so that we print nice errors.
pub fn darcs_contents_to_regex(file: &str, file_path: &PathBuf) -> RegexSet {

    let processed_vec: Vec<&str> = process_darcs_full(file, file_path);
    let processed_str: String = processed_vec.join("");
    let lines = processed_str.split_whitespace();

    let maybe_set = RegexSet::new(lines);
    if let Ok(s) = maybe_set {
        s
    } else {
        eprintln!(
            "{}: failed to parse darcs boring file at {:?}, ignoring",
            "Warning".yellow(),
            file_path
        );
        let empty: Vec<&str> = Vec::new();
        RegexSet::new(empty).expect("Error creating regex from empty vector")
    }

}

/// Given a `.gitignore` or `.ignore` file's contents, process it as a `RegexSet`. The second
/// argument is a file path, included so that we print nice errors.
pub fn file_contents_to_regex(file: &str, file_path: &PathBuf) -> RegexSet {
    let processed_vec: Vec<&str> = process_to_vector(file, file_path);
    let processed_str: String = processed_vec.join("");
    let lines = processed_str.split_whitespace();

    let maybe_set = RegexSet::new(lines.clone());
    if let Ok(s) = maybe_set {
        s
    } else {
        println!("{:?}", lines.collect::<Vec<&str>>());
        println!("{:?}", maybe_set);
        eprintln!(
            "{}: failed to parse .gitignore/.ignore at {:?}, ignoring",
            "Warning".yellow(),
            file_path
        );
        let empty: Vec<&str> = Vec::new();
        RegexSet::new(empty).expect("Error creating regex from empty vector")
    }
}

fn process_to_vector<'a>(input: &'a str, file_path: &PathBuf) -> Vec<&'a str> {
    match process(input) {
        IResult::Done(_, result) => result,
        _ => {
            eprintln!(
                "{}: Failed to parse gitignore at: {}",
                "Error".red(),
                file_path.display()
            );
            Vec::new()
        }
    }
}

fn process_darcs_full<'a>(input: &'a str, file_path: &PathBuf) -> Vec<&'a str> {
    match process_darcs(input) {
        IResult::Done(_, result) => result,
        _ => {
            eprintln!(
                "{}: Failed to parse darcs boring file at: {}",
                "Error".red(),
                file_path.display()
            );
            Vec::new()
        }
    }
}

named!(process_darcs<&str, Vec<&str>>,
    do_parse!(
        opt!(first_line) >>
        r: many0!(darcs) >>
        (r)
    )
);

named!(process<&str, Vec<&str>>,
    do_parse!(
        opt!(first_line) >>
        r: many0!(options) >>
        (r)
    )
);

named!(darcs<&str, &str>,
    alt!(
        tag!("\n") |
        gitignore_comment |
        is_not!("\\#") |
        parse_backslash |
        parse_not_comment
    )
);

named!(line<&str, &str>,
    do_parse!(
        tag!("\n") >>
        ("$\n")
    )
);

named!(options<&str, &str>,
    alt!(
        line |
        gitignore_comment |
        is_not!("*?+.#\n") |
        parse_asterix |
        parse_period |
        parse_questionmark |
        parse_plus |
        parse_not_comment
    )
);

named!(parse_not_comment<&str, &str>,
    do_parse!(
        is_not!("\n") >>
        ("#")
    )
);

named!(first_line<&str, &str>,
    do_parse!(
        tag!("#") >>
        is_not!("\n") >>
        tag!("\n") >>
        ("\n")
    )
);

named!(gitignore_comment<&str, &str>,
    do_parse!(
        tag!("\n#") >>
        is_not!("\n") >>
        ("\n")
    )
);

named!(parse_plus<&str, &str>,
   do_parse!(
       tag!("+") >>
       ("\\+")
   )
);

named!(parse_period<&str, &str>,
    do_parse!(
        tag!(".") >>
        ("\\.")
    )
);

named!(parse_backslash<&str, &str>,
    do_parse!(
        val: alt!(
            do_parse!(tag!("\\_") >> ("_")) |
            do_parse!(tag!("\\") >> ("\\"))
            ) >>
        (val)
    )
);

named!(parse_asterix<&str, &str>,
    do_parse!(
        tag!("*") >>
        opt!(do_parse!(tag!("\n") >> eof!() >> (""))) >>
        (".*")
    )
);

named!(parse_questionmark<&str, &str>,
    do_parse!(
        tag!("?") >>
        opt!(do_parse!(tag!("\n") >> eof!() >> (""))) >>
        (".")
    )
);