/*
NAME
  wav.go

DESCRIPTION
  wav.go contains functions for processing wav.

AUTHOR
  David Sutton <davidsutton@ausocean.org>

LICENSE
  wav.go is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  for more details.

  You should have received a copy of the GNU General Public License in gpl.txt.
  If not, see [GNU licenses](http://www.gnu.org/licenses).
*/

// Package wav provides functions for converting wav audio.
package wav

import (
	"testing"
)

func TestWavWriter(t *testing.T) {
	tests := []struct {
		name    string
		md Metadata
		input []byte
		wantN   int
		wantErr error
	}{
		{name: "Header Only", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000, BitDepth: 16}, input: nil, wantN: 44, wantErr: nil},
		{name: "4 bytes", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 48, wantErr: nil},
		{name: "No format", md: Metadata{Channels: 1, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidFormat},
		{name: "Invalid format", md: Metadata{AudioFormat: 2, Channels: 1, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidFormat},
		{name: "No channels", md: Metadata{AudioFormat: PCMFormat, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidChannels},
		{name: "Invalid channels", md: Metadata{AudioFormat: PCMFormat, Channels: 0, SampleRate: 48000, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidChannels},
		{name: "No sample rate", md: Metadata{AudioFormat: PCMFormat, Channels: 1, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidRate},
		{name: "Invalid sample rate", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 0, BitDepth: 16}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidRate},
		{name: "No bit depth", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidBitDepth},
		{name: "Invalid bit depth", md: Metadata{AudioFormat: PCMFormat, Channels: 1, SampleRate: 48000, BitDepth: 0}, input: []byte{0,0,0,0}, wantN: 0, wantErr: errInvalidBitDepth},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := &WAV{
				Metadata: tt.md,
			}

			gotN, err := w.Write(tt.input)
			if err != tt.wantErr {
				t.Errorf("WAV.Write() error = %v, wantErr %v", err, tt.wantErr)
				return
			}

			if gotN != tt.wantN {
				t.Errorf("WAV.Write() = %v, want %v", gotN, tt.wantN)
			}

		})
	}
}