package tests

import (
	"os"
	"strings"
	"testing"

	"hosts-go/internal/core"
	"hosts-go/internal/tui"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestModelSelection(t *testing.T) {
	sample := `127.0.0.1 localhost
192.168.1.10 example.com`
	lines := strings.Split(sample, "\n")
	hf, _, err := core.ParseHostsContent(lines)
	require.NoError(t, err)

	m := tui.NewModel(hf, "")
	require.NotNil(t, m.SelectedEntry())
	assert.Equal(t, "localhost", m.SelectedEntry().Hostname)

	// Move selection down
	nm, _ := m.Update(tea.KeyMsg{Type: tea.KeyDown})
	m = nm.(tui.Model)
	assert.Equal(t, "example.com", m.SelectedEntry().Hostname)
}

func TestViewModeStatusBar(t *testing.T) {
	sample := `127.0.0.1 localhost
# 192.168.1.10 example.com`
	lines := strings.Split(sample, "\n")
	hf, _, err := core.ParseHostsContent(lines)
	require.NoError(t, err)

	m := tui.NewModel(hf, "")
	nm, _ := m.Update(tea.WindowSizeMsg{Width: 80, Height: 20})
	m = nm.(tui.Model)
	view := m.View()

	assert.Contains(t, view, "VIEW MODE")
	assert.Contains(t, view, "[✓] localhost")
	assert.Contains(t, view, "[ ] example.com")
}

func TestPaneSwitching(t *testing.T) {
	sample := "127.0.0.1 localhost\n192.168.1.10 example.com"
	lines := strings.Split(sample, "\n")
	hf, _, err := core.ParseHostsContent(lines)
	require.NoError(t, err)

	m := tui.NewModel(hf, "")
	// Switch focus to detail pane
	nm, _ := m.Update(tea.KeyMsg{Type: tea.KeyTab})
	m = nm.(tui.Model)

	// Attempt to move down; selection should remain on first entry
	nm, _ = m.Update(tea.KeyMsg{Type: tea.KeyDown})
	m = nm.(tui.Model)
	assert.Equal(t, "localhost", m.SelectedEntry().Hostname)
}

func TestEditModeToggleAndActivation(t *testing.T) {
	sample := "127.0.0.1 localhost\n192.168.1.10 example.com"
	lines := strings.Split(sample, "\n")
	hf, _, err := core.ParseHostsContent(lines)
	require.NoError(t, err)

	m := tui.NewModel(hf, "")

	// enter edit mode
	nm, _ := m.Update(tea.KeyMsg{Type: tea.KeyCtrlE})
	m = nm.(tui.Model)
	assert.Equal(t, tui.EditMode, m.Mode())

	// toggle active state of first entry
	nm, _ = m.Update(tea.KeyMsg{Type: tea.KeySpace})
	m = nm.(tui.Model)
	assert.False(t, m.SelectedEntry().Active)

	// status bar should reflect edit mode
	view := m.View()
	assert.Contains(t, view, "EDIT MODE")
}

func TestSaveWritesToFile(t *testing.T) {
	content := "127.0.0.1 localhost\n192.168.1.10 example.com\n"
	tmp, err := os.CreateTemp(t.TempDir(), "hosts")
	require.NoError(t, err)
	_, err = tmp.WriteString(content)
	require.NoError(t, err)
	require.NoError(t, tmp.Close())

	hf, _, err := core.ParseHostsFile(tmp.Name())
	require.NoError(t, err)

	m := tui.NewModel(hf, tmp.Name())

	nm, _ := m.Update(tea.KeyMsg{Type: tea.KeyCtrlE})
	m = nm.(tui.Model)
	nm, _ = m.Update(tea.KeyMsg{Type: tea.KeySpace})
	m = nm.(tui.Model)
	_, _ = m.Update(tea.KeyMsg{Type: tea.KeyCtrlS})

	saved, _, err := core.ParseHostsFile(tmp.Name())
	require.NoError(t, err)
	assert.False(t, saved.Entries[0].Active)
}