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    use std::fs::File;
    use std::io::prelude::*;
    use std::path::{Path, PathBuf};

    use xdg::BaseDirectories;

    use xml::reader::{EventReader, XmlEvent};

    use walkdir::WalkDir;

    /// Locates fontconfig config
    fn get_config() -> Option<PathBuf> {
        let xdg_dirs = BaseDirectories::with_prefix("fontconfig").unwrap();
        xdg_dirs.find_config_file("fonts.conf").or_else(|| {
            let config = Path::new("/etc/fonts/fonts.conf");
            if config.exists() {
                Some(config.into())
            } else {
                None
            }
        })
    }

    fn parse_config(path: &Path) -> Vec<(Vec<String>, String)> {
        let config_file = File::open(path).unwrap();
        let parser = EventReader::new(config_file);
        let mut tracking_tags: Vec<String> = Vec::new();
        let mut xml_data: Vec<(Vec<String>, String)> = Vec::new();

        for e in parser {
            match e {
                Ok(XmlEvent::StartElement { name, .. }) => {
                    tracking_tags.push(name.to_string());
                }
                Ok(XmlEvent::CData(data)) => {
                    xml_data.push((tracking_tags.clone(), data));
                }
                Ok(XmlEvent::Characters(data)) => {
                    xml_data.push((tracking_tags.clone(), data));
                }
                Ok(XmlEvent::EndElement { .. }) => {
                    tracking_tags.pop();
                }
                Err(e) => panic!(e),
                _ => {}
            }
        }
        xml_data
    }

    /// Represents the main fontconfig config file
    pub struct FontConfig {
        location: PathBuf,
        data: Vec<(Vec<String>, String)>,
    }

    impl FontConfig {
        /// Creates a new FontConfig object by looking for the fontconfig config file
        pub fn new() -> Result<FontConfig, ()> {
            let location = get_config().ok_or(())?;
            let data = parse_config(&location);
            Ok(FontConfig {
                location: location.to_path_buf(),
                data,
            })
        }

        /// Returns the location of the fontconfig config file being used
        pub fn get_location(&self) -> &Path {
            &self.location
        }

        /// Get the directories that contain fonts
        pub fn get_font_dirs(&self) -> Vec<PathBuf> {
            let mut dirs = Vec::new();
            for entry in &self.data {
                if entry.0.last() == Some(&"dir".to_string()) {
                    let path = PathBuf::from(entry.1.clone());
                    if path.exists() {
                        dirs.push(path);
                    }
                }
            }
            dirs
        }

        /// Return all fonts installed on the system
        pub fn get_fonts(&self) -> Result<Vec<PathBuf>, ::std::io::Error> {
            let mut fonts = Vec::new();
            for dir in self.get_font_dirs() {
                for file in WalkDir::new(dir)
                    .into_iter()
                    .filter_map(|e| e.ok())
                    .filter(|p| p.file_type().is_file())
                {
                    let path = file.into_path();
                    if let Some(extension) = path.extension() {
                        match extension.to_str() {
                            Some("ttf") | Some("otf") => fonts.push(path.clone()),
                            _ => {}
                        }
                    }
                }
            }
            Ok(fonts)
        }

        /// Return all 'fonts.dir' files in font directories
        pub fn get_font_dir_files(&self) -> Result<Vec<PathBuf>, ::std::io::Error> {
            let mut fonts = Vec::new();
            for dir in self.get_font_dirs() {
                for file in WalkDir::new(dir)
                    .into_iter()
                    .filter_map(|e| e.ok())
                    .filter(|p| p.file_type().is_file())
                {
                    let path = file.into_path();
                    if let Some(file_name) = path.clone().file_name() {
                        if file_name.to_str() == Some("fonts.dir") {
                            fonts.push(path);
                        }
                    }
                }
            }
            Ok(fonts)
        }

        /// Returns the paths of regular fonts belonging to a specific family installed on the system
        pub fn get_regular_family_fonts(&self, family: &str) -> Result<Vec<PathBuf>, ::std::io::Error> {
            let fonts_dir_files = self.get_font_dir_files()?;
            let mut fonts: Vec<PathBuf> = Vec::new();
            for dir in fonts_dir_files {
                let mut file = ::std::fs::File::open(dir.clone()).unwrap();
                let mut buf = String::new();
                file.read_to_string(&mut buf)?;

                for line in buf.lines().filter(|l| l.find("medium-r-normal").is_some()) {
                    if let Some(split) = line.find(' ') {
                        let name = line[..split].to_string();
                        let settings = line[split..].to_string();
                        let mut char_buf = String::new();
                        for c in settings.chars() {
                            if c == ' ' || c == '-' {
                                char_buf.clear()
                            } else {
                                char_buf.push(c);
                                if char_buf == family {
                                    let path = dir.with_file_name(name);
                                    if !fonts.contains(&path) {
                                        fonts.push(path);
                                    }
                                    break;
                                }
                            }
                        }
                    }
                }
            }

            Ok(fonts)
        }
    }

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