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use std::fmt;

#[cfg(not(feature = "io"))]
include!("serde_types.in.rs");

#[cfg(feature = "io")]
include!(concat!(env!("OUT_DIR"), "/stats_serde_types.in.rs"));

impl Stats {
    /// Create a new `Stats` from a file path.
    ///
    /// ```
    /// use std::path::PathBuf;
    /// use tokei::Stats;
    ///
    /// let path = PathBuf::from("src/main.rs");
    ///
    /// let stats = Stats::new(path);
    /// ```
    pub fn new(name: PathBuf) -> Self {
        Stats { name: name, ..Self::default() }
    }
}

impl Default for Stats {
    fn default() -> Self {
        Stats {
            name: PathBuf::new(),
            lines: usize::default(),
            code: usize::default(),
            comments: usize::default(),
            blanks: usize::default(),
        }
    }
}

fn find_char_boundary(s: &str, index: usize) -> usize {
    for i in 0..4 {
        if s.is_char_boundary(index + i) {
            return index + i;
        }
    }
    unreachable!();
}

macro_rules! display_stats {
    ($f:expr, $this:expr, $name:expr) => {
        write!($f,
               " {: <25} {:>12} {:>12} {:>12} {:>12}",
               $name,
               $this.lines,
               $this.code,
               $this.comments,
               $this.blanks)
    }
}

impl fmt::Display for Stats {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let name = self.name.to_string_lossy();
        let name_length = name.len();

        if name_length == 25 || name_length <= 24 {
            display_stats!(f, self, name)
        } else {
            let mut formatted = String::from("|");
            let from = find_char_boundary(&name, name_length - 24);
            formatted.push_str(&name[from..]);
            display_stats!(f, self, formatted)
        }
    }
}