package conversation

import (
	"errors"
	"testing"
)

func TestDocumentedConversationPath(t *testing.T) {
	path := []Status{StatusPreparing, StatusRoomIssued, StatusStartingAgent, StatusActive, StatusStopping, StatusCompleted}
	for index := 1; index < len(path); index++ {
		if err := ValidateTransition(path[index-1], path[index]); err != nil {
			t.Fatalf("transition %s -> %s: %v", path[index-1], path[index], err)
		}
	}
}

func TestDuplicateAndTerminalCallbacksCannotRegress(t *testing.T) {
	if err := ValidateTransition(StatusActive, StatusActive); err != nil {
		t.Fatalf("duplicate callback should be idempotent: %v", err)
	}
	for _, terminal := range []Status{StatusCompleted, StatusFailed, StatusExpired} {
		if !IsTerminal(terminal) {
			t.Fatalf("%s should be terminal", terminal)
		}
		if err := ValidateTransition(terminal, StatusActive); !errors.Is(err, ErrInvalidTransition) {
			t.Fatalf("terminal regression %s -> ACTIVE error = %v", terminal, err)
		}
	}
}

func TestFailureAndExpiryBranches(t *testing.T) {
	for _, transition := range [][2]Status{
		{StatusPreparing, StatusFailed},
		{StatusRoomIssued, StatusExpired},
		{StatusStartingAgent, StatusFailed},
	} {
		if err := ValidateTransition(transition[0], transition[1]); err != nil {
			t.Fatal(err)
		}
	}
}