// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

package agent_test

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"go.probo.inc/probo/pkg/agent"
	"go.probo.inc/probo/pkg/llm"
)

func TestResult_FinalMessage(t *testing.T) {
	t.Parallel()

	t.Run(
		"returns zero value when messages is empty",
		func(t *testing.T) {
			t.Parallel()

			r := &agent.Result{}
			msg := r.FinalMessage()

			assert.Equal(t, llm.Message{}, msg)
			assert.Equal(t, "", msg.Text())
		},
	)

	t.Run(
		"returns the last message with single message",
		func(t *testing.T) {
			t.Parallel()

			r := &agent.Result{
				Messages: []llm.Message{
					assistantMessage("Hello!"),
				},
			}

			assert.Equal(t, "Hello!", r.FinalMessage().Text())
		},
	)

	t.Run(
		"returns the last message with multiple messages",
		func(t *testing.T) {
			t.Parallel()

			r := &agent.Result{
				Messages: []llm.Message{
					userMessage("Hi"),
					assistantMessage("Hello!"),
					userMessage("How are you?"),
					assistantMessage("I'm fine."),
				},
			}

			assert.Equal(t, "I'm fine.", r.FinalMessage().Text())
		},
	)

	t.Run(
		"returns message regardless of role",
		func(t *testing.T) {
			t.Parallel()

			r := &agent.Result{
				Messages: []llm.Message{
					assistantMessage("first"),
					userMessage("last user message"),
				},
			}

			msg := r.FinalMessage()
			assert.Equal(t, llm.RoleUser, msg.Role)
			assert.Equal(t, "last user message", msg.Text())
		},
	)
}