package main

import (
    "log"

    "github.com/danielgatis/go-soundfont/pkg/soundfont"
)

func main() {
    // Load a SoundFont
    sf, err := soundfont.New("path/to/soundfont.sf2")
    if err != nil {
        log.Fatal(err)
    }

    // Configure output
    sf.SetOutput(soundfont.OutputStereo, 44100, 0)

    // Set a preset on channel 0
    presetIdx := sf.GetPresetIndex(0, 0) // Bank 0, Program 0
    sf.ChannelSetPreset(0, presetIdx)

    // Play a note
    sf.NoteOn(0, 60, 0.8) // Channel 0, Middle C, velocity 0.8

    // Render audio
    buffer := make([]float32, 1024*2) // Stereo buffer
    sf.Render(buffer, 1024, false)

    // Stop the note
    sf.NoteOff(0, 60)
}

// Load from file
sf, err := soundfont.New("soundfont.sf2")

// Load from memory
sf, err := soundfont.NewFromMemory(data)

// Load from io.ReadSeeker
sf, err := soundfont.Load(reader)

// Set output mode and sample rate
sf.SetOutput(soundfont.OutputStereo, 44100, gainDB)

// Play a note (channel 0-15, key 0-127, velocity 0.0-1.0)
sf.NoteOn(channel, key, velocity)

// Release a note
sf.NoteOff(channel, key)

// Release all notes
sf.AllNotesOff()

// Release all notes on a channel
sf.ChannelAllNotesOff(channel)

// Set preset (instrument)
sf.ChannelSetPreset(channel, presetIndex)

// Set volume (0.0 - 1.0)
sf.ChannelSetVolume(channel, volume)

// Set pan (0.0 = left, 0.5 = center, 1.0 = right)
sf.ChannelSetPan(channel, pan)

// Set pitch bend (-1.0 to 1.0)
sf.ChannelSetPitchBend(channel, bend)

// Set pitch bend range in semitones (default: 2)
sf.ChannelSetPitchRange(channel, semitones)

// Get number of presets
count := sf.GetPresetCount()

// Get preset name
name := sf.GetPresetName(index)

// Find preset by bank and program number
index := sf.GetPresetIndex(bank, program)

// Render audio samples
// output: stereo interleaved float32 buffer
// numSamples: number of sample frames (buffer size / 2)
// mix: if true, add to existing buffer content
sf.Render(output, numSamples, mix)