// Package ui provides the bubbletea terminal UI for wallarm:
//   - Deploy choice: local deploy or remote assistance
//   - Dashboard: lists existing nodes with actions
//
// Deployment logic runs in plain terminal (main.go), not inside the TUI.
package ui

import (
	"fmt"
	"strings"

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

	"git.sechpoint.app/customer-engineering/wallarm/internal/state"
)

var (
	titleStyle  = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("63")).MarginBottom(1)
	goodStyle   = lipgloss.NewStyle().Foreground(lipgloss.Color("42"))
	warnStyle   = lipgloss.NewStyle().Foreground(lipgloss.Color("227"))
	badStyle    = lipgloss.NewStyle().Foreground(lipgloss.Color("196"))
	dimStyle    = lipgloss.NewStyle().Foreground(lipgloss.Color("240"))
	activeStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("63")).Bold(true)
)

type Model struct {
	state  stateView
	width  int
	height int
}

type stateView int

const (
	viewRoute        stateView = iota
	viewDeployChoice           // local deploy or remote assist?
	viewDashboard
)

// Run starts the bubbletea TUI. Returns nil if user chose local deploy (exit and run form).
func Run() error {
	m := Model{state: viewRoute}
	p := tea.NewProgram(m)
	if _, err := p.Run(); err != nil {
		return err
	}
	return nil
}

func (m Model) Init() tea.Cmd { return nil }

func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "q", "ctrl+c":
			return m, tea.Quit
		case "1":
			if m.state == viewDeployChoice {
				return m, tea.Quit // exit TUI, main.go runs deploy form
			}
		case "2":
			if m.state == viewDeployChoice {
				return m, tea.Quit // exit TUI, main.go runs tunnel flow
			}
		}
	case tea.WindowSizeMsg:
		m.width = msg.Width
		m.height = msg.Height
	}

	switch m.state {
	case viewRoute:
		if state.HasDeployment() {
			m.state = viewDashboard
		} else {
			m.state = viewDeployChoice
		}
	}
	return m, nil
}

func (m Model) View() string {
	switch m.state {
	case viewRoute:
		return ""
	case viewDeployChoice:
		return deployChoiceView(m)
	case viewDashboard:
		return dashboardView(m)
	}
	return ""
}

// ─── Deploy Choice ───────────────────────────────────────────────────

func deployChoiceView(m Model) string {
	s := titleStyle.Render("🛡️  Wallarm Setup") + "\n\n"
	s += "How would you like to proceed?\n\n"
	s += activeStyle.Render("  [1] Deploy locally") + "\n"
	s += "      Configure and deploy the Wallarm node on this server now.\n\n"
	s += activeStyle.Render("  [2] Remote assistance") + "\n"
	s += "      Open a secure tunnel so a remote admin can deploy for you.\n\n"
	s += dimStyle.Render("Press 1 or 2, q to quit")
	return s
}

// ─── Dashboard ───────────────────────────────────────────────────────

func dashboardView(m Model) string {
	s, err := state.Load()
	if err != nil || s == nil {
		return badStyle.Render("Error loading state.") + "\nPress q to quit"
	}

	out := titleStyle.Render("📊 Wallarm Dashboard") + "\n"
	out += fmt.Sprintf("Type: %s  |  Cloud: %s (%s)\n", s.DeploymentType, s.CloudRegion, s.APIHost)
	out += dimStyle.Render(strings.Repeat("─", 50)) + "\n\n"

	if len(s.Nodes) == 0 {
		out += dimStyle.Render("No nodes deployed yet.") + "\n\n"
	} else {
		out += activeStyle.Render("Nodes:") + "\n"
		for _, n := range s.Nodes {
			marker := "●"
			style := goodStyle
			if n.Status != "running" {
				marker = "○"
				style = warnStyle
			}
			out += style.Render(fmt.Sprintf("  %s %s — %s", marker, n.Name, n.Status))
			if n.Address != "" {
				out += dimStyle.Render(fmt.Sprintf("  (%s)", n.Address))
			}
			out += "\n"
		}
		out += "\n"
	}

	out += "Actions:\n"
	out += fmt.Sprintf("  %s\n", activeStyle.Render("[a] Add node"))
	out += fmt.Sprintf("  %s\n", activeStyle.Render("[c] Configure"))
	out += fmt.Sprintf("  %s\n", activeStyle.Render("[r] Remove node"))
	out += fmt.Sprintf("  %s\n", activeStyle.Render("[t] Start tunnel"))
	out += fmt.Sprintf("  %s\n", dimStyle.Render("[q] Quit"))

	return out
}