import Vex = require("vexflow");
import {GraphicalNote} from "../GraphicalNote";
import {Note} from "../../VoiceData/Note";
import {ClefInstruction} from "../../VoiceData/Instructions/ClefInstruction";
import {VexFlowConverter} from "./VexFlowConverter";
import {Pitch} from "../../../Common/DataObjects/Pitch";
import {Fraction} from "../../../Common/DataObjects/Fraction";
import {OctaveEnum, OctaveShift} from "../../VoiceData/Expressions/ContinuousExpressions/OctaveShift";
import { GraphicalVoiceEntry } from "../GraphicalVoiceEntry";

/**
 * The VexFlow version of a [[GraphicalNote]].
 */
export class VexFlowGraphicalNote extends GraphicalNote {
    constructor(note: Note, parent: GraphicalVoiceEntry, activeClef: ClefInstruction,
                octaveShift: OctaveEnum = OctaveEnum.NONE,  graphicalNoteLength: Fraction = undefined) {
        super(note, parent, graphicalNoteLength);
        this.clef = activeClef;
        this.octaveShift = octaveShift;
        if (note.Pitch) {
            // TODO: Maybe shift to Transpose function when available
            const drawPitch: Pitch = OctaveShift.getPitchFromOctaveShift(note.Pitch, octaveShift);
            this.vfpitch = VexFlowConverter.pitch(this, drawPitch);
            this.vfpitch[1] = undefined;
        }
    }

    public octaveShift: OctaveEnum;
    // The pitch of this note as given by VexFlowConverter.pitch
    public vfpitch: [string, string, ClefInstruction];
    // The corresponding VexFlow StaveNote (plus its index in the chord)
    public vfnote: [Vex.Flow.StaveNote, number];
    // The current clef
    private clef: ClefInstruction;

    /**
     * Update the pitch of this note. Necessary in order to display accidentals correctly.
     * This is called by VexFlowGraphicalSymbolFactory.addGraphicalAccidental.
     * @param pitch
     */
    public setPitch(pitch: Pitch): void {
        if (this.vfnote) {
            const acc: string = Pitch.accidentalVexflow(pitch.Accidental);
            if (acc) {
                alert(acc);
                this.vfnote[0].addAccidental(this.vfnote[1], new Vex.Flow.Accidental(acc));
            }
        } else {
            // revert octave shift, as the placement of the note is independent of octave brackets
            const drawPitch: Pitch = OctaveShift.getPitchFromOctaveShift(pitch, this.octaveShift);
            this.vfpitch = VexFlowConverter.pitch(this, drawPitch);
        }
    }

    /**
     * Set the VexFlow StaveNote corresponding to this GraphicalNote, together with its index in the chord.
     * @param note
     * @param index
     */
    public setIndex(note: Vex.Flow.StaveNote, index: number): void {
        this.vfnote = [note, index];
    }

    /**
     * Gets the clef for this note
     */
    public Clef(): ClefInstruction {
        return this.clef;
    }
}