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use std::fs;

use crate::ast::Solution;
use jwalk::{Parallelism, WalkDir};
use std::option::Option::Some;

pub mod ast;
mod lex;
pub mod msbuild;
mod parser;

#[macro_use]
extern crate lalrpop_util;
extern crate jwalk;
extern crate nom;
extern crate petgraph;

#[cfg(test)] // <-- not needed in integration tests
extern crate rstest;

lalrpop_mod!(
    #[allow(clippy::all)]
    #[allow(unused)]
    pub solp
);

/// Consume provides parsed solution consumer
pub trait Consume {
    /// Called in case of success parsing
    fn ok(&mut self, path: &str, solution: &Solution);
    /// Called on error
    fn err(&self, path: &str);
    /// Whether to use debug mode (usually just print AST into console)
    fn is_debug(&self) -> bool;
}

/// parse_file parses single solution file specified by path.
pub fn parse_file(path: &str, consumer: &mut dyn Consume) {
    match fs::read_to_string(path) {
        Ok(contents) => match parse(consumer, &contents) {
            Some(solution) => consumer.ok(path, &solution),
            None => consumer.err(path),
        },
        Err(e) => eprintln!("{} - {}", path, e),
    }
}

/// parse parses solution content.
pub fn parse<'a>(consumer: &mut dyn Consume, contents: &'a str) -> Option<Solution<'a>> {
    parser::parse_str(contents, consumer.is_debug())
}

/// scan parses directory specified by path. recursively
/// it finds all files with sln extension and parses them.
/// returns the number of scanned solutions
pub fn scan(path: &str, extension: &str, consumer: &mut dyn Consume) -> usize {
    let parallelism = Parallelism::RayonNewPool(num_cpus::get_physical());

    let root = decorate_path(path);

    let iter = WalkDir::new(root)
        .skip_hidden(false)
        .follow_links(false)
        .parallelism(parallelism);

    let ext = extension.trim_start_matches('.');

    iter.into_iter()
        .filter(Result::is_ok)
        .map(Result::unwrap)
        .filter(|f| f.file_type().is_file())
        .map(|f| f.path())
        .filter(|p| {
            return match p.extension() {
                Some(s) => s == ext,
                None => false,
            };
        })
        .map(|f| f.to_str().unwrap_or("").to_string())
        .inspect(|fp| parse_file(fp, consumer))
        .count()
}

/// On Windows added trailing back slash \ if volume and colon passed so as to paths look more pleasant
#[cfg(target_os = "windows")]
fn decorate_path(path: &str) -> String {
    if path.len() == 2 && path.ends_with(':') {
        format!("{}\\", path)
    } else {
        String::from(path)
    }
}

/// On Unix just passthrough as is
#[cfg(not(target_os = "windows"))]
fn decorate_path(path: &str) -> String {
    String::from(path)
}

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

    #[cfg(not(target_os = "windows"))]
    #[rstest]
    #[case("", "")]
    #[case("/", "/")]
    #[case("/home", "/home")]
    #[case("d:", "d:")]
    #[trace]
    fn decorate_path_tests(#[case] raw_path: &str, #[case] expected: &str) {
        // Arrange

        // Act
        let actual = decorate_path(raw_path);

        // Assert
        assert_eq!(actual, expected);
    }

    #[cfg(target_os = "windows")]
    #[rstest]
    #[case("", "")]
    #[case("/", "/")]
    #[case("d:", "d:\\")]
    #[case("dd:", "dd:")]
    #[trace]
    fn decorate_path_tests(#[case] raw_path: &str, #[case] expected: &str) {
        // Arrange

        // Act
        let actual = decorate_path(raw_path);

        // Assert
        assert_eq!(actual, expected);
    }
}