package tentaclewire

import (
	"encoding/json"
	"errors"
	"strings"
	"testing"
)

func TestPresentationContract(t *testing.T) {
	for _, value := range []Presentation{
		{Speech: "Hello, é猫😀é"}, {Braille: "é猫😀é"},
		{Speech: "Speech text", Braille: "Display text"},
		{Speech: "Hello world!", Braille: "Hello world!", Uninterruptible: true},
		{Speech: strings.Repeat("é", MaxPresentationBytes/2)},
	} {
		data, _ := json.Marshal(value)
		decoded, err := DecodePresentation(data)
		if err != nil || decoded != value {
			t.Fatalf("round trip: %+v, %v", decoded, err)
		}
	}
	for _, data := range []string{`null`, `[]`, `{}`, `{"speech":null}`, `{"speech":42}`,
		`{"speech":""}`, `{"speech":"hello","voice":"default"}`, `{"speech":"one","speech":"two"}`,
		`{"braille":"bad\u0000text"}`, `{"speech":"bad\u001btext"}`,
		`{"braille":"hello","uninterruptible":true}`, `{"uninterruptible":true}`,
		`{"speech":"hello","uninterruptible":null}`, `{"speech":"hello","uninterruptible":"true"}`,
		`{"speech":"hello","uninterruptible":true,"uninterruptible":false}`} {
		if _, err := DecodePresentation([]byte(data)); !errors.Is(err, ErrProtocol) {
			t.Fatalf("accepted %s: %v", data, err)
		}
	}
	data, _ := json.Marshal(Presentation{Braille: strings.Repeat("é", MaxPresentationBytes/2+1)})
	if _, err := DecodePresentation(data); !errors.Is(err, ErrLimit) {
		t.Fatal("UTF-8 byte bound", err)
	}
}