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use std::fmt;

use util;
use scale;
use attribute::Attributes;

pub struct Chord {
    pub name: String,
    pub notes: Vec<String>
}

impl Chord {

    ///Constructor from given root note and interval vec
    pub fn new(root: &String, intervals: Vec<u8>, extended: bool) -> Chord {

        let mut name = String::new();
        let mut notes = vec![];

        name.push_str(&root.to_uppercase());

        let root_note = util::str_to_note(&root);
        let chromatic = scale::chromatic_notes(root_note);
        let mut attr = Attributes::new();

        //Pick notes from chromatic scale according to interval values
        for interval in intervals.iter() {
            notes.push(util::note_to_str(chromatic[*interval as usize]));
            attr.push_interval(*interval as u8);
        }

        //Push attributes to name
        name.push_str(attr.resolve().as_ref());

        if extended {
            name.push('*');
        }

        Chord{name: name, notes: notes}
    }

    // Formats notes according to given src of notes
    pub fn format_notes(&mut self, src: &Vec<(char,i8)>) {
        let strings = src.iter().map(|&note| util::note_to_str(note)).collect::<Vec<String>>();
        for el in self.notes.iter_mut(){
            if !strings.contains(el) {
                *el = util::alt_note_str(el.clone());
            }
        }
    }
}

impl fmt::Display for Chord {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{0:<18} ({1:})", 
               &self.name, 
               &self.notes.iter().map(|s| s.to_uppercase()).collect::<Vec<String>>().join(", "))
    }
}