package image

import "testing"

func Test_isWebPAnimated(t *testing.T) {
	tests := []struct {
		name string
		buf  []byte
		want bool
	}{
		{
			"basic animated",
			[]byte{
				0x52, 0x49, 0x46, 0x46, 0xb2, 0x3a, 0x17, 0x00, 0x57, 0x45, 0x42, 0x50, 0x56, 0x50, 0x38, 0x58,
				0x0a, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x7f, 0x02, 0x00, 0x55, 0x01, 0x00, 0x41, 0x4e,
				0x49, 0x4d, 0x06, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x41, 0x4e, 0x4d, 0x46,
			},
			true,
		},
		{
			"static webp",
			[]byte{
				0x52, 0x49, 0x46, 0x46, 0x68, 0x76, 0x00, 0x00, 0x57, 0x45, 0x42, 0x50, 0x56, 0x50, 0x38, 0x20,
				0x5c, 0x76, 0x00, 0x00, 0xd2, 0xbe, 0x01, 0x9d, 0x01, 0x2a, 0x26, 0x02, 0x70, 0x01, 0x3e, 0xd5,
				0x4e, 0x97, 0x43, 0xa2, 0x06, 0x16, 0xd1, 0xb4, 0x88, 0x03, 0x51, 0x39, 0xb7, 0x13, 0x33, 0x75,
			},
			false,
		},
		{
			"false animated bit",
			[]byte{
				0x52, 0x49, 0x46, 0x46, 0xb2, 0x3a, 0x17, 0x00, 0x57, 0x45, 0x42, 0x50, 0x56, 0x50, 0x38, 0x58,
				0x09, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x7f, 0x02, 0x00, 0x55, 0x01, 0x00, 0x41, 0x4e,
				0x49, 0x4d, 0x06, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x41, 0x4e, 0x4d, 0x46,
			},
			false,
		},
		{
			"ANIM out of range",
			[]byte{
				0x52, 0x49, 0x46, 0x46, 0xb2, 0x3a, 0x17, 0x00, 0x57, 0x45, 0x42, 0x50, 0x56, 0x50, 0x38, 0x58,
				0x0a, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x7f, 0x02, 0x00, 0x55, 0x01, 0x00, 0x3e, 0xd5,
				0x4e, 0x97, 0x43, 0xa2, 0x06, 0x16, 0xd1, 0xb4, 0x88, 0x03, 0x51, 0x39, 0xb7, 0x13, 0x33, 0x75,
				0x41, 0x4e, 0x49, 0x4d, 0x41, 0x4e, 0x49, 0x4d, 0x41, 0x4e, 0x49, 0x4d, 0x41, 0x4e, 0x49, 0x4d,
			},
			false,
		},
		{
			"not webp",
			[]byte{
				0x52, 0x49, 0x46, 0x46, 0xb2, 0x3a, 0x17, 0x00, 0x58, 0x45, 0x42, 0x50, 0x56, 0x50, 0x38, 0x58,
				0x0a, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x7f, 0x02, 0x00, 0x55, 0x01, 0x00, 0x3e, 0xd5,
				0x4e, 0x97, 0x43, 0xa2, 0x06, 0x16, 0xd1, 0xb4, 0x88, 0x03, 0x51, 0x39, 0xb7, 0x13, 0x33, 0x75,
				0x41, 0x4e, 0x49, 0x4d, 0x41, 0x4e, 0x49, 0x4d, 0x41, 0x4e, 0x49, 0x4d, 0x41, 0x4e, 0x49, 0x4d,
			},
			false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := isWebPAnimated(tt.buf); got != tt.want {
				t.Errorf("isWebPAnimated() = %v, want %v", got, tt.want)
			}
		})
	}
}