#!/usr/bin/env python3
"""
01-basic-chord.py - MIDIUtil basic example
Creates a simple chord progression in C major using MIDIUtil.
"""
from midiutil import MIDIFile

# === Setup ===
degrees = [
    [60, 64, 67],   # C3 (C4, E4, G4)
    [62, 65, 69],   # D3 (D4, F4, A4)
    [64, 67, 71],   # E3 (E4, G4, B4)
    [65, 69, 72],   # F3 (F4, A4, C5)
]  # Chords: C, Dm, Em, F

track = 0       # Track index
channel = 0     # MIDI channel 1
time = 0        # Start at beat 0
duration = 1    # Each chord lasts 1 beat (quarter note)
bpm = 120
volume = 100    # MIDI velocity 0-127

# === Create MIDI File ===
my_midi = MIDIFile(1)  # 1 user track + auto tempo track = format 1
my_midi.addTempo(track, 0, bpm)
my_midi.addTrackName(track, 0, "Basic Chord Progression")

# === Add Notes ===
for chord in degrees:
    for pitch in chord:
        my_midi.addNote(track, channel, pitch, time, duration, volume)
    time += duration  # Advance one beat per chord

# === Write to Disk ===
with open("basic-chord.mid", "wb") as output_file:
    my_midi.writeFile(output_file)

print("Written: basic-chord.mid")