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pub mod scale;
pub mod chord;
mod util;
mod attribute;
mod json;

use self::chord::Chord;

#[macro_use]
extern crate serde_json;

/// Returns notes in a given key and scale
fn get_notes(keystr: &str, scalestr: &str) -> Vec<(char, i8)> {

    let key = util::str_to_note(keystr);
    let chromatic_notes: Vec<(char, i8)> = scale::chromatic_notes(key);

    ///Return notes filtered by scale
    let scale = scale::get_scale(scalestr);

    chromatic_notes.into_iter().enumerate()
        .filter(|&(index, _)| scale.contains(&(index as u8)))
        .map(|(_, e)| e)
        .collect()
}

//Returns list of chords a given rootnote can create with given list of notes
fn get_chords(root_note: (char, i8), notes: &Vec<(char, i8)>, extended: bool) -> Vec<Chord> {
    let mut chords = vec![];

    //Root note as string presentation
    let root_str = util::note_to_str(root_note);

    //Flip vec to root note
    let root_index = notes.iter().position(|&note| note == root_note)
        .expect("Failed to find root index!");

    let a = notes[..root_index].to_vec();
    let b = notes[root_index..].to_vec();

    let mut flipped = vec![];
    flipped.extend(b);
    flipped.extend(a);

    let chromatic_notes: Vec<(char, i8)> = scale::chromatic_notes(root_note);
    let mut intervals = vec![];

    for v in &flipped[1..] {
        let interval = chromatic_notes.iter()
            .position(|&note| note == *v || note == util::alt_note(*v))
            .expect("Failed to find interval position for note");
        intervals.push(interval as u8);
    }

    // Triads
    if intervals.len() > 3 {
        chords.push(Chord::new(&root_str, vec![0, intervals[1], intervals[3]], false));
        chords.push(Chord::new(&root_str, vec![0, intervals[2], intervals[3]], false));
    }

    // +1
    if intervals.len() > 4 {
        chords.push(Chord::new(&root_str, vec![0, intervals[1], intervals[3], intervals[4]], false));
        chords.push(Chord::new(&root_str, vec![0, intervals[2], intervals[3], intervals[4]], false));

        if extended {
            chords.push(Chord::new(&root_str, vec![0, intervals[1], intervals[2], intervals[3], intervals[4]], true));
        }
    }

    // +2
    if intervals.len() > 5 {
        chords.push(Chord::new(&root_str, vec![0, intervals[1], intervals[3], intervals[5]], false));

        if extended {
            chords.push(Chord::new(&root_str, vec![0, intervals[2], intervals[3], intervals[5]], true));

            // +3
            chords.push(Chord::new(&root_str, vec![0, intervals[1], intervals[3], intervals[4], intervals[5]], true));
            chords.push(Chord::new(&root_str, vec![0, intervals[2], intervals[3], intervals[4], intervals[5]], true));
            chords.push(Chord::new(&root_str, vec![0, intervals[1], intervals[2], intervals[3], intervals[4], intervals[5]], true));
        }
    }

    if intervals.len() > 6 {
        if extended {
            // +4
            chords.push(Chord::new(&root_str, vec![0, 
                                   intervals[1], 
                                   intervals[2], 
                                   intervals[3], 
                                   intervals[4], 
                                   intervals[5], 
                                   intervals[6]],
                                   true));
        }
    }

    for chord in chords.iter_mut() {
        chord.format_notes(notes);
    }

    //Return chords
    chords
}

pub fn analyze(key: &str, scale: &str, extended: bool) -> (Vec<String>,Vec<Chord>) {
    //Notes in scale
    let mut notes = get_notes(&key, &scale);

    //Format notes for readability
    match scale {
        "chromatic" => {},
        _ => notes = util::formatted_notes(notes)
    }

    //Chords in scale
    let mut chords: Vec<Chord> = vec![]; 
    if scale != "chromatic" {
        for v in &notes {
            chords.extend(get_chords(*v, &notes, extended));
        }
    }

    //Return values
    (notes.into_iter().map(|note| util::note_to_str(note).to_uppercase()).collect::<Vec<String>>(), chords)
}

pub fn analyze_json(key: &str, scale: &str, extended: bool) -> String {
    let result = analyze(key, scale, extended);
    json::serialize(result.0, result.1)
}

// Return lib supported scales
pub fn supported_scales() -> Vec<String> {
    scale::supported_scales()
}

pub fn supported_scales_json() -> String {
    json!({"scales": json!(scale::supported_scales())}).to_string()
}

// extern C api

extern crate libc;
use libc::c_char;
use std::ffi::CStr;
use std::ffi::CString;

#[no_mangle]
pub extern fn c_analyze(key: *const c_char, scale: *const c_char, extended: bool) -> *const c_char {
    let c_key = unsafe {
        assert!(!key.is_null());

        CStr::from_ptr(key)
    };

    let c_scale = unsafe {
        assert!(!scale.is_null());

        CStr::from_ptr(scale)
    };

    CString::new(analyze_json(c_key.to_str().unwrap(), c_scale.to_str().unwrap(), extended)).unwrap().into_raw()
}