package main

import (
	"fmt"
	"os"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"

	"github.com/calmcacil/wg-admin/internal/config"
	"github.com/calmcacil/wg-admin/internal/tui/screens"
)

const version = "0.1.0"

var (
	styleTitle    = lipgloss.NewStyle().Foreground(lipgloss.Color("62")).Bold(true)
	styleSubtitle = lipgloss.NewStyle().Foreground(lipgloss.Color("241"))
	styleSuccess  = lipgloss.NewStyle().Foreground(lipgloss.Color("46"))
	styleError    = lipgloss.NewStyle().Foreground(lipgloss.Color("196"))
	styleHelpKey  = lipgloss.NewStyle().Foreground(lipgloss.Color("63")).Bold(true)
)

type model struct {
	currentScreen  screens.Screen
	previousScreen screens.Screen
	quitting       bool
	initialized    bool
	errorScreen    *screens.ErrorScreen
}

func (m model) Init() tea.Cmd {
	if os.Geteuid() != 0 {
		fmt.Println(styleError.Render("ERROR: Must run as root"))
		os.Exit(1)
	}
	_, _ = config.LoadConfig()
	return nil
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	// Handle initialization on first update after Init
	if !m.initialized {
		m.initialized = true
		m.currentScreen = screens.NewListScreen()
		return m, m.currentScreen.Init()
	}

	switch msg := msg.(type) {
	case tea.KeyMsg:
		// Only quit on 'q' or ctrl+c when on list screen
		// Other screens handle their own navigation keys
		if msg.String() == "q" || msg.String() == "ctrl+c" {
			if _, ok := m.currentScreen.(*screens.ListScreen); ok {
				m.quitting = true
				return m, tea.Quit
			}
			// For other screens, let them handle the key
		}
		switch msg.String() {
		case "?":
			// Switch to help screen
			m.previousScreen = m.currentScreen
			m.currentScreen = screens.NewHelpScreen(m.previousScreen)
			return m, m.currentScreen.Init()
		case "l":
			// Switch to list screen
			m.currentScreen = screens.NewListScreen()
			return m, m.currentScreen.Init()
		case "a":
			// Switch to add screen
			m.previousScreen = m.currentScreen
			m.currentScreen = screens.NewAddScreen()
			return m, m.currentScreen.Init()
		}
	case screens.ClientSelectedMsg:
		// User selected a client - show detail screen
		m.previousScreen = m.currentScreen
		m.currentScreen = screens.NewDetailScreen(msg.Client.Client)
		return m, m.currentScreen.Init()
	case screens.ClientDeletedMsg:
		// Client was deleted - show success message and return to list
		m.currentScreen = screens.NewListScreen()
		return m, m.currentScreen.Init()
	case screens.ClientCreatedMsg:
		// Client was created - return to list screen
		m.currentScreen = screens.NewListScreen()
		return m, m.currentScreen.Init()
	case screens.RestoreCompletedMsg:
		// Restore completed - return to list screen to refresh clients
		m.currentScreen = screens.NewListScreen()
		return m, m.currentScreen.Init()
	case screens.CloseDetailScreenMsg:
		// Detail screen closed - go back to previous screen
		if m.previousScreen != nil {
			m.currentScreen = m.previousScreen
			m.previousScreen = nil
			return m, m.currentScreen.Init()
		}
		m.currentScreen = screens.NewListScreen()
		return m, m.currentScreen.Init()
	}

	// Pass messages to current screen
	if m.currentScreen != nil {
		newScreen, cmd := m.currentScreen.Update(msg)
		// If screen returns nil, go back to previous screen
		if newScreen == nil {
			if m.previousScreen != nil {
				m.currentScreen = m.previousScreen
				m.previousScreen = nil
			}
		} else if newScreen != m.currentScreen {
			// Screen is switching to a different screen
			m.previousScreen = m.currentScreen
			m.currentScreen = newScreen
		}
		return m, cmd
	}

	return m, nil
}

func (m model) View() string {
	if m.quitting {
		return "\nGoodbye!\n"
	}

	if m.currentScreen != nil && m.initialized {
		return m.currentScreen.View()
	}

	title := styleTitle.Render("WireGuard Client Manager")
	subtitle := styleSubtitle.Render(fmt.Sprintf("v%s", version))
	bar := fmt.Sprintf("Press %s for help, %s to quit", styleHelpKey.Render("?"), styleHelpKey.Render("q"))

	return title + " " + subtitle + "\n\nInitializing...\n\n" + bar
}

func main() {
	p := tea.NewProgram(model{}, tea.WithAltScreen())
	if _, err := p.Run(); err != nil {
		fmt.Printf("Error: %v\n", err)
		os.Exit(1)
	}
}