package main

import (
	"strings"
	"testing"

	"github.com/charmbracelet/bubbles/viewport"
	tea "github.com/charmbracelet/bubbletea"
)

// Since sidekick-tui/main.go uses global variables and is a tea.Model, 
// we test basic model behavior.

func TestInitialModel(t *testing.T) {
	// For testing, sidekick.LoadConfig would fail or look in its default dir.
	// This ensures that the model can be initialized even without a config.
	m := initialModel()
	
	if m.agent == nil {
		t.Error("expected default agent to be initialized even without config")
	}
	
	if m.textarea.Value() != "" {
		t.Errorf("expected empty textarea, got %s", m.textarea.Value())
	}
	
	if len(m.history) != 1 {
		t.Errorf("expected 1 initial message in history, got %d", len(m.history))
	}
}

func TestModelUpdate(t *testing.T) {
	m := initialModel()
	m.ready = true
	m.width = 80
	m.height = 24

	// Test a key message (Enter)
	m.textarea.SetValue("Hello")
	newModel, cmd := m.Update(tea.KeyMsg{Type: tea.KeyEnter})
	
	tm := newModel.(model)
	if tm.isThinking != true {
		t.Error("expected model to be in thinking state after Enter")
	}
	if tm.textarea.Value() != "" {
		t.Error("expected textarea to be reset after Enter")
	}
	if cmd == nil {
		t.Error("expected a command after Enter")
	}

	// Test an agent response message
	respModel, _ := tm.Update(agentResponseMsg{response: "Hi"})
	rm := respModel.(model)
	if rm.isThinking != false {
		t.Error("expected model to stop thinking after response")
	}
	if len(rm.history) < 2 {
		t.Error("expected history list to grow after response")
	}
}

func TestMessageWrapping(t *testing.T) {
	m := initialModel()
	m.ready = true
	m.width = 10
	m.height = 20
	m.viewport = viewport.New(10, 5) // Very narrow
	
	longMsg := "This is a very long message that should be wrapped."
	respModel, _ := m.Update(agentResponseMsg{response: longMsg})
	rm := respModel.(model)
	
	content := rm.viewport.View()
	if !strings.Contains(content, "\n") {
		t.Errorf("expected long message to be wrapped, but no newline found in viewport")
	}
}