package main

import (
	"bufio"
	"context"
	"fmt"
	"io"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"sort"
	"strings"
	"sync"
	"time"

	"github.com/charmbracelet/bubbles/key"
	"github.com/charmbracelet/bubbles/list"
	"github.com/charmbracelet/bubbles/spinner"
	"github.com/charmbracelet/bubbles/viewport"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

// Message types
type (
	backupStartMsg    struct{ service string }
	backupDoneMsg     struct{ service, output string }
	backupErrorMsg    struct{ service, error string }
	backupProgressMsg struct{ service string; progress int; output string }
	backupStopMsg     struct{ service string }
	backupOutputMsg   struct{ service, line string }
	logsUpdatedMsg    struct{}
	statusUpdatedMsg  struct{}
	clearOutputMsg    struct{}
	configUpdateMsg   struct{}
)

// BackupStatus represents the status of a backup operation
type BackupStatus struct {
	Service     string    `json:"service"`
	Status      string    `json:"status"` // running, success, error, idle
	LastRun     time.Time `json:"last_run"`
	Duration    string    `json:"duration"`
	Output      string    `json:"output"`
	Error       string    `json:"error"`
	Progress    int       `json:"progress"`    // 0-100 percentage
	StartTime   time.Time `json:"start_time"`
	EndTime     time.Time `json:"end_time"`
	BackupSize  string    `json:"backup_size"`
	FilesCount  int       `json:"files_count"`
	PID         int       `json:"pid"` // Process ID if running
	Context     context.Context `json:"-"` // Context for cancellation
	Cancel      context.CancelFunc `json:"-"` // Cancel function
}

// RunningProcess represents a running backup process
type RunningProcess struct {
	Cmd     *exec.Cmd
	Context context.Context
	Cancel  context.CancelFunc
	Output  []string
	Mutex   sync.RWMutex
}

// LogEntry represents a log entry from backup operations
type LogEntry struct {
	Timestamp time.Time `json:"timestamp"`
	Service   string    `json:"service"`
	Level     string    `json:"level"`
	Message   string    `json:"message"`
}

// BackupItem represents a backup service in the list
type BackupItem struct {
	title       string
	description string
	service     string
	script      string
	args        []string
}

func (i BackupItem) FilterValue() string { return i.title }
func (i BackupItem) Title() string       { return i.title }
func (i BackupItem) Description() string { return i.description }

// Styles
var (
	titleStyle = lipgloss.NewStyle().
			Foreground(lipgloss.Color("#FAFAFA")).
			Background(lipgloss.Color("#7D56F4")).
			Padding(0, 1)

	statusBarStyle = lipgloss.NewStyle().
			Foreground(lipgloss.AdaptiveColor{Light: "#343433", Dark: "#C1C6B2"}).
			Background(lipgloss.AdaptiveColor{Light: "#D9DCCF", Dark: "#353533"})

	successStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#04B575"))
	errorStyle   = lipgloss.NewStyle().Foreground(lipgloss.Color("#EF4444"))
	runningStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#F59E0B"))
	idleStyle    = lipgloss.NewStyle().Foreground(lipgloss.Color("#6B7280"))

	// Style for the selected item in the list
	selectedItemStyle = lipgloss.NewStyle().
				Foreground(lipgloss.Color("170")).
				Background(lipgloss.Color("57"))

	docStyle = lipgloss.NewStyle().Margin(1, 2)
)

// Key bindings
type keyMap struct {
	Up         key.Binding
	Down       key.Binding
	Left       key.Binding
	Right      key.Binding
	Help       key.Binding
	Quit       key.Binding
	Enter      key.Binding
	Tab        key.Binding
	Escape     key.Binding
	Refresh    key.Binding
	ViewLogs   key.Binding
	ViewStatus key.Binding
	ViewConfig key.Binding
	Stop       key.Binding
	Clear      key.Binding
}

func (k keyMap) ShortHelp() []key.Binding {
	return []key.Binding{k.Help, k.Quit}
}

func (k keyMap) FullHelp() [][]key.Binding {
	return [][]key.Binding{
		{k.Up, k.Down, k.Enter},
		{k.Tab, k.ViewLogs, k.ViewStatus, k.ViewConfig},
		{k.Refresh, k.Stop, k.Clear},
		{k.Help, k.Quit},
	}
}

var keys = keyMap{
	Up: key.NewBinding(
		key.WithKeys("up", "k"),
		key.WithHelp("↑/k", "move up"),
	),
	Down: key.NewBinding(
		key.WithKeys("down", "j"),
		key.WithHelp("↓/j", "move down"),
	),
	Left: key.NewBinding(
		key.WithKeys("left", "h"),
		key.WithHelp("←/h", "move left"),
	),
	Right: key.NewBinding(
		key.WithKeys("right", "l"),
		key.WithHelp("→/l", "move right"),
	),
	Help: key.NewBinding(
		key.WithKeys("?"),
		key.WithHelp("?", "toggle help"),
	),
	Quit: key.NewBinding(
		key.WithKeys("q", "esc", "ctrl+c"),
		key.WithHelp("q", "quit"),
	),
	Enter: key.NewBinding(
		key.WithKeys("enter", " "),
		key.WithHelp("enter", "run backup"),
	),
	Tab: key.NewBinding(
		key.WithKeys("tab"),
		key.WithHelp("tab", "switch panel"),
	),
	Escape: key.NewBinding(
		key.WithKeys("esc"),
		key.WithHelp("esc", "back"),
	),
	Refresh: key.NewBinding(
		key.WithKeys("r"),
		key.WithHelp("r", "refresh"),
	),
	ViewLogs: key.NewBinding(
		key.WithKeys("v"),
		key.WithHelp("v", "view logs"),
	),
	ViewStatus: key.NewBinding(
		key.WithKeys("s"),
		key.WithHelp("s", "view status"),
	),
	ViewConfig: key.NewBinding(
		key.WithKeys("f"),
		key.WithHelp("f", "view config"),
	),
	Stop: key.NewBinding(
		key.WithKeys("x"),
		key.WithHelp("x", "stop backup"),
	),
	Clear: key.NewBinding(
		key.WithKeys("c"),
		key.WithHelp("c", "clear output"),
	),
}

// Model represents the application state
type Model struct {
	list            list.Model
	viewport        viewport.Model
	spinner         spinner.Model
	keys            keyMap
	width           int
	height          int
	activePanel     int // 0: list, 1: viewport, 2: status
	showHelp        bool
	ready           bool
	backupStatus    map[string]*BackupStatus
	logs            []LogEntry
	shellPath       string
	items           []BackupItem // Store backup items for reference
	runningBackups  map[string]*RunningProcess // Track running processes with enhanced control
	currentView     string // "main", "logs", "status"
}

// Initialize the model
func initialModel() Model {
	// Get the shell path (parent directory of tui)
	shellPath, _ := filepath.Abs(filepath.Dir(os.Args[0]) + "/..")

	// Create backup items
	items := []list.Item{
		BackupItem{
			title:       "📦 Plex Backup",
			description: "Complete Plex Media Server backup with integrity checking",
			service:     "plex",
			script:      filepath.Join(shellPath, "plex", "backup-plex.sh"),
			args:        []string{"--non-interactive"},
		},
		BackupItem{
			title:       "🖼️ Immich Backup",
			description: "Database and uploads backup with B2 sync",
			service:     "immich",
			script:      filepath.Join(shellPath, "immich", "backup-immich.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "🎬 Media Services Backup",
			description: "Sonarr, Radarr, Prowlarr, and other media services",
			service:     "media",
			script:      filepath.Join(shellPath, "backup-media.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "✅ Validate Plex Backups",
			description: "Check integrity and completeness of Plex backups",
			service:     "plex-validate",
			script:      filepath.Join(shellPath, "plex", "validate-plex-backups.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "✅ Validate Immich Backups",
			description: "Check integrity and completeness of Immich backups",
			service:     "immich-validate",
			script:      filepath.Join(shellPath, "immich", "validate-immich-backups.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "📊 Monitor Plex Status",
			description: "Real-time Plex backup monitoring and status",
			service:     "plex-monitor",
			script:      filepath.Join(shellPath, "plex", "monitor-plex-backup.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "🔧 Environment Files Backup",
			description: "Backup Docker environment and configuration files",
			service:     "env",
			script:      filepath.Join(shellPath, "backup-env-files.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "🐳 Docker Configuration Backup",
			description: "Backup Docker containers and compose files",
			service:     "docker",
			script:      filepath.Join(shellPath, "backup-docker.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "✅ Validate Environment Backups",
			description: "Check integrity of environment and Docker backups",
			service:     "env-validate",
			script:      filepath.Join(shellPath, "validate-env-backups.sh"),
			args:        []string{},
		},
		BackupItem{
			title:       "🔄 Restore Plex",
			description: "Restore Plex from backup with validation",
			service:     "plex-restore",
			script:      filepath.Join(shellPath, "plex", "restore-plex.sh"),
			args:        []string{"--dry-run"},
		},
		BackupItem{
			title:       "🔄 Restore Immich",
			description: "Restore Immich from backup",
			service:     "immich-restore",
			script:      filepath.Join(shellPath, "immich", "restore-immich.sh"),
			args:        []string{},
		},
	}

	const defaultWidth = 20

	l := list.New(items, BackupItemDelegate{}, defaultWidth, 14)
	l.Title = "Backup Manager"
	l.SetShowStatusBar(false)
	l.SetFilteringEnabled(false)
	l.Styles.Title = titleStyle
	l.Styles.PaginationStyle = list.DefaultStyles().PaginationStyle.PaddingLeft(4)
	l.Styles.HelpStyle = list.DefaultStyles().HelpStyle.PaddingLeft(4).PaddingBottom(1)

	s := spinner.New()
	s.Spinner = spinner.Dot
	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("205"))

	vp := viewport.New(78, 20)
	vp.SetContent("Welcome to Backup Manager!\n\nSelect a backup operation from the list and press Enter to execute.\n\nUse 'v' to view logs, 'r' to refresh status, and 'tab' to switch between panels.")

	return Model{
		list:           l,
		viewport:       vp,
		spinner:        s,
		keys:           keys,
		activePanel:    0,
		showHelp:       false,
		ready:          false,
		backupStatus:   make(map[string]*BackupStatus),
		logs:           []LogEntry{},
		shellPath:      shellPath,
		items:          convertToBackupItems(items), // Store the items
		runningBackups: make(map[string]*RunningProcess),
		currentView:    "main",
	}
}

// BackupItemDelegate for custom rendering
type BackupItemDelegate struct{}

func (d BackupItemDelegate) Height() int                             { return 1 }
func (d BackupItemDelegate) Spacing() int                            { return 0 }
func (d BackupItemDelegate) Update(_ tea.Msg, _ *list.Model) tea.Cmd { return nil }
func (d BackupItemDelegate) Render(w io.Writer, m list.Model, index int, listItem list.Item) {
	i, ok := listItem.(BackupItem)
	if !ok {
		return
	}

	itemTitle := fmt.Sprintf("%d. %s", index+1, i.title)

	if index == m.Index() {
		fmt.Fprint(w, selectedItemStyle.Render("> "+itemTitle))
	} else {
		// Add leading spaces to align with the selected item's "> " prefix
		fmt.Fprint(w, idleStyle.Render("  "+itemTitle))
	}
}

// Helper functions
func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// Helper function to convert list items to BackupItems
func convertToBackupItems(items []list.Item) []BackupItem {
	backupItems := make([]BackupItem, len(items))
	for i, item := range items {
		if bi, ok := item.(BackupItem); ok {
			backupItems[i] = bi
		}
	}
	return backupItems
}

func (m Model) Init() tea.Cmd {
	return tea.Batch(
		m.spinner.Tick,
		m.loadBackupStatus(),
		m.loadLogs(),
	)
}

func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmd tea.Cmd
	var cmds []tea.Cmd

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		m.width = msg.Width
		m.height = msg.Height

		if !m.ready {
			// Since this program can be run in a variety of terminals and
			// we want to ensure the viewport takes up the right amount of space,
			// we calculate the viewport height based on the terminal height.
			m.viewport.Width = msg.Width - 4
			m.viewport.Height = msg.Height - 10
			m.ready = true

			// This is only necessary for high performance rendering, which in
			// most cases you won't need.
			m.viewport.SetContent("Welcome to Backup Manager!\n\nSelect a backup operation from the list and press Enter to execute.\n\nUse 'v' to view logs, 'r' to refresh status, and 'tab' to switch between panels.")
		} else {
			m.viewport.Width = msg.Width - 4
			m.viewport.Height = msg.Height - 10
		}

		h, v := docStyle.GetFrameSize()
		m.list.SetSize(msg.Width-h, msg.Height-v)

	case tea.KeyMsg:
		switch {
		case key.Matches(msg, m.keys.Quit):
			return m, tea.Quit

		case key.Matches(msg, m.keys.Tab):
			m.activePanel = (m.activePanel + 1) % 2

		case key.Matches(msg, m.keys.Refresh):
			cmds = append(cmds, m.loadBackupStatus())
			cmds = append(cmds, m.loadLogs())

		case key.Matches(msg, m.keys.ViewLogs):
			m.showLogs()
			m.currentView = "logs"

		case key.Matches(msg, m.keys.ViewStatus):
			m.showStatus()
			m.currentView = "status"

		case key.Matches(msg, m.keys.ViewConfig):
			m.showConfig()
			m.currentView = "config"

		case key.Matches(msg, m.keys.Stop):
			if i, ok := m.list.SelectedItem().(BackupItem); ok {
				if process, exists := m.runningBackups[i.service]; exists {
					cmds = append(cmds, m.stopBackup(i.service, process))
				}
			}

		case key.Matches(msg, m.keys.Clear):
			m.viewport.SetContent("Output cleared.\n\nSelect a backup operation from the list and press Enter to execute.")
			m.currentView = "main"

		case key.Matches(msg, m.keys.Escape) && m.currentView != "main":
			m.viewport.SetContent("Welcome to Backup Manager!\n\nSelect a backup operation from the list and press Enter to execute.\n\nUse 'v' to view logs, 's' to view status, and 'tab' to switch between panels.")
			m.currentView = "main"

		case key.Matches(msg, m.keys.Enter) && m.activePanel == 0:
			if i, ok := m.list.SelectedItem().(BackupItem); ok {
				cmds = append(cmds, m.executeBackup(i))
			}

		case key.Matches(msg, m.keys.Help):
			m.showHelp = !m.showHelp
		}

		// Update the focused component
		if m.activePanel == 0 {
			m.list, cmd = m.list.Update(msg)
		} else {
			m.viewport, cmd = m.viewport.Update(msg)
		}
		cmds = append(cmds, cmd)

	case backupStartMsg:
		if m.backupStatus[msg.service] == nil {
			m.backupStatus[msg.service] = &BackupStatus{}
		}
		
		// Create context for this backup
		ctx, cancel := context.WithCancel(context.Background())
		
		m.backupStatus[msg.service].Service = msg.service
		m.backupStatus[msg.service].Status = "running"
		m.backupStatus[msg.service].LastRun = time.Now()
		m.backupStatus[msg.service].StartTime = time.Now()
		m.backupStatus[msg.service].Progress = 0
		m.backupStatus[msg.service].Context = ctx
		m.backupStatus[msg.service].Cancel = cancel
		
		m.viewport.SetContent(fmt.Sprintf("🚀 Starting backup for %s...\n\nInitializing backup process...\nPress 'x' to cancel if needed.", msg.service))
		
		// Start progress ticker for time-based progress estimation
		cmds = append(cmds, m.startProgressTicker(msg.service))

	case backupProgressMsg:
		if status, ok := m.backupStatus[msg.service]; ok && status.Status == "running" {
			status.Progress = msg.progress
			// msg.output from the ticker is a general status line (e.g., "Backup in progress... (X elapsed)")
			// This will be used for the main output area in the viewport for this specific message.
			m.updateViewportForRunningService(msg.service, msg.output)
		}

	case backupOutputMsg:
		if status, ok := m.backupStatus[msg.service]; ok {
			// Append to output history
			currentOutput := status.Output
			if currentOutput != "" {
				currentOutput += "\n"
			}
			currentOutput += msg.line

			// Keep only last 20 lines to prevent memory issues
			lines := strings.Split(currentOutput, "\n")
			if len(lines) > 20 {
				lines = lines[len(lines)-20:]
				currentOutput = strings.Join(lines, "\n")
			}

			status.Output = currentOutput // Update the canonical script output log

			// Update display if this service is currently running
			if status.Status == "running" {
				// Display the accumulated script output from status.Output
				m.updateViewportForRunningService(msg.service, status.Output)
			}
		}

	case backupStopMsg:
		if m.backupStatus[msg.service] != nil {
			m.backupStatus[msg.service].Status = "stopped"
			m.backupStatus[msg.service].EndTime = time.Now()
			if m.backupStatus[msg.service].Cancel != nil {
				m.backupStatus[msg.service].Cancel()
			}
			delete(m.runningBackups, msg.service)
		}
		m.viewport.SetContent(fmt.Sprintf("🛑 Backup stopped for %s.\n\nThe backup process was cancelled by user request.", msg.service))

	case backupDoneMsg:
		if m.backupStatus[msg.service] != nil {
			m.backupStatus[msg.service].Status = "success"
			m.backupStatus[msg.service].Output = msg.output
			m.backupStatus[msg.service].EndTime = time.Now()
			m.backupStatus[msg.service].Duration = m.backupStatus[msg.service].EndTime.Sub(m.backupStatus[msg.service].StartTime).String()
			m.backupStatus[msg.service].Progress = 100
			
			// Clean up context
			if m.backupStatus[msg.service].Cancel != nil {
				m.backupStatus[msg.service].Cancel()
			}
		}
		delete(m.runningBackups, msg.service)
		
		// Parse output for additional info
		lines := strings.Split(msg.output, "\n")
		var summary strings.Builder
		
		// Extract meaningful summary information
		for _, line := range lines {
			if strings.Contains(line, "Total files:") ||
			   strings.Contains(line, "Total size:") ||
			   strings.Contains(line, "Backup completed") ||
			   strings.Contains(line, "Archive created") ||
			   strings.Contains(line, "Files backed up:") {
				summary.WriteString("📊 " + strings.TrimSpace(line) + "\n")
			}
		}
		
		summaryText := summary.String()
		if summaryText == "" {
			summaryText = "📊 Backup completed successfully"
		}
		
		duration := ""
		if m.backupStatus[msg.service] != nil {
			duration = m.backupStatus[msg.service].Duration
		}
		
		m.viewport.SetContent(fmt.Sprintf("✅ Backup completed successfully for %s!\n\nDuration: %s\n\n%s\n\n📋 Full Output:\n%s", 
			msg.service, duration, summaryText, msg.output))

	case backupErrorMsg:
		if m.backupStatus[msg.service] != nil {
			m.backupStatus[msg.service].Status = "error"
			m.backupStatus[msg.service].Error = msg.error
			m.backupStatus[msg.service].EndTime = time.Now()
			m.backupStatus[msg.service].Duration = m.backupStatus[msg.service].EndTime.Sub(m.backupStatus[msg.service].StartTime).String()
			
			// Clean up context
			if m.backupStatus[msg.service].Cancel != nil {
				m.backupStatus[msg.service].Cancel()
			}
		}
		delete(m.runningBackups, msg.service)
		
		duration := ""
		if m.backupStatus[msg.service] != nil {
			duration = m.backupStatus[msg.service].Duration
		}
		
		// Provide helpful error analysis
		var errorAnalysis string
		if strings.Contains(msg.error, "permission denied") {
			errorAnalysis = "\n💡 This appears to be a permission issue. Try running with appropriate privileges."
		} else if strings.Contains(msg.error, "command not found") {
			errorAnalysis = "\n💡 The backup script was not found. Check that the script exists and is executable."
		} else if strings.Contains(msg.error, "docker") {
			errorAnalysis = "\n💡 This appears to be a Docker-related issue. Ensure Docker is running and accessible."
		} else if strings.Contains(msg.error, "space") {
			errorAnalysis = "\n💡 This might be a disk space issue. Check available storage."
		}
		
		m.viewport.SetContent(fmt.Sprintf("❌ Backup failed for %s!\n\nDuration: %s%s\n\n🚨 Error Details:\n%s", 
			msg.service, duration, errorAnalysis, msg.error))

	case spinner.TickMsg:
		m.spinner, cmd = m.spinner.Update(msg)
		cmds = append(cmds, cmd)

	case logsUpdatedMsg:
		// Logs have been updated, refresh if in logs view
		if m.currentView == "logs" {
			m.showLogs()
		}

	case statusUpdatedMsg:
		// Status has been updated, refresh if in status view
		if m.currentView == "status" {
			m.showStatus()
		}

	case configUpdateMsg:
		// Configuration has been updated, refresh if in config view
		if m.currentView == "config" {
			m.showConfig()
		}

	case clearOutputMsg:
		m.viewport.SetContent("Output cleared.\n\nSelect a backup operation and press Enter to execute.")
		m.currentView = "main"
	}

	return m, tea.Batch(cmds...)
}

// Helper method to update viewport for a running service
func (m *Model) updateViewportForRunningService(service string, outputForDisplay string) {
	status := m.backupStatus[service] // Assume status exists and is valid, checked by callers

	elapsed := time.Since(status.StartTime)
	progress := status.Progress
	progressBar := createProgressBar(progress)

	var etaStr string
	if progress > 0 && progress < 100 && elapsed > 0 {
		// Consistent ETA calculation based on current progress and elapsed time
		// Assumes 'progress' is a percentage of completion (0-100).
		totalEstimatedRaw := float64(elapsed.Nanoseconds()) * (100.0 / float64(progress))
		totalEstimatedDuration := time.Duration(totalEstimatedRaw)
		remainingDuration := totalEstimatedDuration - elapsed
		if remainingDuration > 0 {
			etaStr = fmt.Sprintf("\\nETA: %s", remainingDuration.Round(time.Second))
		}
	}

	m.viewport.SetContent(fmt.Sprintf("⏳ Backup in progress for %s...\\n\\n%s %d%%%%\\nElapsed: %s%s\\n\\n📋 Latest output:\\n%s\\n\\nPress 'x' to stop the backup.",
		service, progressBar, progress, elapsed.Round(time.Second), etaStr, outputForDisplay))
}

func (m Model) View() string {
	if !m.ready {
		return "\n  Initializing..."
	}

	// Create status bar
	statusBar := m.createStatusBar()

	// Create help section
	helpText := ""
	if m.showHelp {
		help := m.keys.FullHelp()
		var helpLines []string
		for i, group := range help {
			var groupHelp []string
			for _, binding := range group {
				groupHelp = append(groupHelp, fmt.Sprintf("%s: %s", binding.Help().Key, binding.Help().Desc))
			}
			helpLines = append(helpLines, strings.Join(groupHelp, " | "))
			if i < len(help)-1 {
				helpLines = append(helpLines, "")
			}
		}
		helpText = "\n" + strings.Join(helpLines, "\n")
	}

	// Create viewport style based on active panel and current view
	viewportStyle := lipgloss.NewStyle().Border(lipgloss.RoundedBorder())
	if m.activePanel == 1 {
		viewportStyle = viewportStyle.BorderStyle(lipgloss.ThickBorder()).BorderForeground(lipgloss.Color("#7D56F4"))
	}
	
	// Add view indicator to viewport title
	viewportTitle := ""
	switch m.currentView {
	case "logs":
		viewportTitle = "📋 Backup Logs"
	case "status":
		viewportTitle = "📊 Backup Status"
	case "config":
		viewportTitle = "⚙️ Configuration"
	default:
		viewportTitle = "💻 Output"
	}
	
	// Layout based on active panel
	return lipgloss.JoinVertical(lipgloss.Left,
		titleStyle.Render("🔧 Media & Plex Backup Manager"),
		lipgloss.JoinHorizontal(lipgloss.Top,
			lipgloss.NewStyle().
				Border(lipgloss.RoundedBorder()).
				BorderForeground(func() lipgloss.Color {
					if m.activePanel == 0 {
						return lipgloss.Color("#7D56F4")
					}
					return lipgloss.Color("#444444")
				}()).
				Width(50).
				Render(m.list.View()),
			viewportStyle.
				Width(m.width-54).
				Render(lipgloss.JoinVertical(lipgloss.Left,
					lipgloss.NewStyle().
						Foreground(lipgloss.Color("#7D56F4")).
						Bold(true).
						Render(viewportTitle),
					m.viewport.View(),
				)),
		),
		statusBar,
		helpText,
	)
}

func (m Model) createStatusBar() string {
	var parts []string

	// Add current view indicator
	viewIndicator := fmt.Sprintf("View: %s", strings.ToUpper(m.currentView))
	parts = append(parts, idleStyle.Render(viewIndicator))

	// Add running backups count
	runningCount := len(m.runningBackups)
	if runningCount > 0 {
		parts = append(parts, runningStyle.Render(fmt.Sprintf("Running: %d", runningCount)))
	}

	// Add service statuses
	for service, status := range m.backupStatus {
		var statusText string
		switch status.Status {
		case "running":
			progressText := ""
			if status.Progress > 0 {
				progressText = fmt.Sprintf(" (%d%%)", status.Progress)
			}
			statusText = runningStyle.Render(fmt.Sprintf("%s: %s%s %s", service, status.Status, progressText, m.spinner.View()))
		case "success":
			statusText = successStyle.Render(fmt.Sprintf("%s: ✓ %s", service, status.Duration))
		case "error":
			statusText = errorStyle.Render(fmt.Sprintf("%s: ✗ failed", service))
		case "stopped":
			statusText = idleStyle.Render(fmt.Sprintf("%s: 🛑 stopped", service))
		default:
			statusText = idleStyle.Render(fmt.Sprintf("%s: idle", service))
		}
		parts = append(parts, statusText)
	}

	if len(m.backupStatus) == 0 {
		parts = append(parts, idleStyle.Render("No backups running"))
	}

	// Add navigation help
	if m.activePanel == 0 {
		parts = append(parts, "Panel: Backup List (Press Tab to switch)")
	} else {
		parts = append(parts, "Panel: Output (Press Tab to switch)")
	}

	return statusBarStyle.Render(strings.Join(parts, " | "))
}

func (m *Model) showLogs() {
	var content strings.Builder
	content.WriteString("=== BACKUP LOGS ===\n\n")

	if len(m.logs) == 0 {
		content.WriteString("No logs available.\n")
	} else {
		// Sort logs by timestamp (newest first)
		sort.Slice(m.logs, func(i, j int) bool {
			return m.logs[i].Timestamp.After(m.logs[j].Timestamp)
		})

		for _, entry := range m.logs {
			timestamp := entry.Timestamp.Format("2006-01-02 15:04:05")
			content.WriteString(fmt.Sprintf("[%s] %s - %s: %s\n",
				timestamp, entry.Service, entry.Level, entry.Message))
		}
	}

	m.viewport.SetContent(content.String())
}

func (m *Model) showStatus() {
	var content strings.Builder
	content.WriteString("=== BACKUP STATUS ===\n\n")

	if len(m.backupStatus) == 0 {
		content.WriteString("No backup status available.\n\nRun some backups to see their status here.")
	} else {
		// Sort services alphabetically
		var services []string
		for service := range m.backupStatus {
			services = append(services, service)
		}
		sort.Strings(services)

		for _, service := range services {
			status := m.backupStatus[service]
			content.WriteString(fmt.Sprintf("🔧 Service: %s\n", strings.ToUpper(service)))
			
			// Status with emoji
			statusIcon := "⭕"
			switch status.Status {
			case "running":
				statusIcon = "🔄"
			case "success":
				statusIcon = "✅"
			case "error":
				statusIcon = "❌"
			case "stopped":
				statusIcon = "🛑"
			}
			content.WriteString(fmt.Sprintf("   Status: %s %s\n", statusIcon, status.Status))
			
			if !status.LastRun.IsZero() {
				content.WriteString(fmt.Sprintf("   Last Run: %s\n", status.LastRun.Format("2006-01-02 15:04:05")))
			}
			
			if status.Duration != "" {
				content.WriteString(fmt.Sprintf("   Duration: %s\n", status.Duration))
			}
			
			if status.Progress > 0 && status.Status == "running" {
				content.WriteString(fmt.Sprintf("   Progress: %d%%\n", status.Progress))
			}
			
			if status.BackupSize != "" {
				content.WriteString(fmt.Sprintf("   Size: %s\n", status.BackupSize))
			}
			
			if status.FilesCount > 0 {
				content.WriteString(fmt.Sprintf("   Files: %d\n", status.FilesCount))
			}
			
			if status.Error != "" {
				content.WriteString(fmt.Sprintf("   Error: %s\n", status.Error[:min(100, len(status.Error))]))
			}
			
			content.WriteString("\n")
		}
		
		// Add summary
		running := 0
		success := 0
		failed := 0
		for _, status := range m.backupStatus {
			switch status.Status {
			case "running":
				running++
			case "success":
				success++
			case "error":
				failed++
			}
		}
		
		content.WriteString("📊 SUMMARY:\n")
		content.WriteString(fmt.Sprintf("   Running: %d | Success: %d | Failed: %d\n", running, success, failed))
	}

	m.viewport.SetContent(content.String())
}

func (m *Model) showConfig() {
	var content strings.Builder
	content.WriteString("=== BACKUP CONFIGURATION ===\n\n")

	// System Information
	content.WriteString("🖥️ SYSTEM INFO:\n")
	content.WriteString(fmt.Sprintf("   Shell Path: %s\n", m.shellPath))
	content.WriteString(fmt.Sprintf("   Terminal Size: %dx%d\n", m.width, m.height))
	content.WriteString(fmt.Sprintf("   Active Services: %d\n", len(m.items)))
	content.WriteString("\n")

	// Available Backup Services
	content.WriteString("📦 AVAILABLE SERVICES:\n")
	for i, item := range m.items {
		content.WriteString(fmt.Sprintf("   %d. %s\n", i+1, strings.TrimPrefix(item.title, "📦 ")))
		content.WriteString(fmt.Sprintf("      Script: %s\n", item.script))
		if len(item.args) > 0 {
			content.WriteString(fmt.Sprintf("      Args: %s\n", strings.Join(item.args, " ")))
		}
		
		// Check if script exists
		if _, err := os.Stat(item.script); os.IsNotExist(err) {
			content.WriteString("      ⚠️ Status: Script not found\n")
		} else {
			content.WriteString("      ✅ Status: Ready\n")
		}
		content.WriteString("\n")
	}

	// Key Bindings Summary
	content.WriteString("⌨️ KEY BINDINGS:\n")
	content.WriteString("   Navigation: ↑/↓ or k/j (move), Tab (switch panels)\n")
	content.WriteString("   Actions: Enter (run), x (stop), c (clear)\n")
	content.WriteString("   Views: v (logs), s (status), f (config)\n")
	content.WriteString("   System: r (refresh), ? (help), q (quit)\n\n")

	// Performance Tips
	content.WriteString("💡 TIPS:\n")
	content.WriteString("   • Use 'r' to refresh status after running external scripts\n")
	content.WriteString("   • Monitor logs with 'v' during long-running backups\n")
	content.WriteString("   • Check 's' for detailed backup statistics\n")
	content.WriteString("   • Use 'x' to gracefully stop running backups\n")

	m.viewport.SetContent(content.String())
}

func (m *Model) stopBackup(service string, process *RunningProcess) tea.Cmd {
	return tea.Cmd(func() tea.Msg {
		if process != nil {
			// Cancel the context to signal graceful shutdown
			if process.Cancel != nil {
				process.Cancel()
			}
			
			// Give process time to shut down gracefully
			time.Sleep(2 * time.Second)
			
			// Force kill if still running
			if process.Cmd != nil && process.Cmd.Process != nil {
				if process.Cmd.ProcessState == nil || !process.Cmd.ProcessState.Exited() {
					process.Cmd.Process.Kill()
				}
			}
		}
		return backupStopMsg{service: service}
	})
}

func (m Model) executeBackup(item BackupItem) tea.Cmd {
	return tea.Cmd(func() tea.Msg {
		return backupStartMsg{service: item.service}
	})
}

// Enhanced backup command with real-time progress tracking
func (m Model) runBackupCommand(item BackupItem) tea.Cmd {
	return tea.Cmd(func() tea.Msg {
		// Create context for cancellation
		ctx, cancel := context.WithCancel(context.Background())
		defer cancel()
		
		// Execute the backup script with context
		cmd := exec.CommandContext(ctx, item.script, item.args...)
		cmd.Dir = m.shellPath
		
		// Create pipes for stdout and stderr
		stdout, err := cmd.StdoutPipe()
		if err != nil {
			return backupErrorMsg{
				service: item.service,
				error:   fmt.Sprintf("Failed to create stdout pipe: %s", err.Error()),
			}
		}
		
		stderr, err := cmd.StderrPipe()
		if err != nil {
			return backupErrorMsg{
				service: item.service,
				error:   fmt.Sprintf("Failed to create stderr pipe: %s", err.Error()),
			}
		}
		
		// Start the command
		if err := cmd.Start(); err != nil {
			return backupErrorMsg{
				service: item.service,
				error:   fmt.Sprintf("Failed to start backup: %s", err.Error()),
			}
		}
		
		var outputBuilder strings.Builder
		var allOutput []string
		
		// Monitor stdout and stderr in goroutines
		var wg sync.WaitGroup
		wg.Add(2)
		
		// Read stdout
		go func() {
			defer wg.Done()
			scanner := bufio.NewScanner(stdout)
			for scanner.Scan() {
				line := scanner.Text()
				outputBuilder.WriteString(line + "\n")
				allOutput = append(allOutput, line)
			}
		}()
		
		// Read stderr
		go func() {
			defer wg.Done()
			scanner := bufio.NewScanner(stderr)
			for scanner.Scan() {
				line := scanner.Text()
				outputBuilder.WriteString("[STDERR] " + line + "\n")
				allOutput = append(allOutput, "[STDERR] "+line)
			}
		}()
		
		// Wait for the command to complete
		err = cmd.Wait()
		
		// Wait for output readers to finish
		wg.Wait()
		
		finalOutput := outputBuilder.String()
		
		if err != nil {
			// Check if it was cancelled
			if ctx.Err() == context.Canceled {
				return backupStopMsg{service: item.service}
			}
			
			return backupErrorMsg{
				service: item.service,
				error:   fmt.Sprintf("Backup failed: %s\n\n📋 Output:\n%s", err.Error(), finalOutput),
			}
		}

		return backupDoneMsg{
			service: item.service,
			output:  finalOutput,
		}
	})
}

// Estimate progress based on output patterns and service type
func estimateProgress(output []string, service string) int {
	if len(output) == 0 {
		return 0
	}
	
	switch service {
	case "plex":
		// Plex backup stages: stop service (10%), backup files (60%), verify (20%), archive (10%)
		stages := map[string]int{
			"stopping":  10,
			"backing":   40,
			"copying":   60,
			"verifying": 80,
			"archiving": 90,
			"completed": 100,
		}
		
		for _, line := range output {
			line = strings.ToLower(line)
			for stage, progress := range stages {
				if strings.Contains(line, stage) {
					return progress
				}
			}
		}
		
	case "immich":
		// Immich stages: database dump (50%), uploads backup (40%), upload to B2 (10%)
		stages := map[string]int{
			"database backup": 25,
			"compressing":     50,
			"upload directory": 75,
			"uploading to":    90,
			"completed":       100,
		}
		
		for _, line := range output {
			line = strings.ToLower(line)
			for stage, progress := range stages {
				if strings.Contains(line, stage) {
					return progress
				}
			}
		}
		
	case "media":
		// Media services backup: each service adds progress
		services := []string{"sonarr", "radarr", "prowlarr", "audiobookshelf", "tautulli", "sabnzbd", "jellyseerr"}
		completed := 0
		
		for _, service := range services {
			for _, line := range output {
				if strings.Contains(strings.ToLower(line), service) && 
				   (strings.Contains(strings.ToLower(line), "success") || 
					strings.Contains(strings.ToLower(line), "completed")) {
					completed++
					break
				}
			}
		}
		
		return (completed * 100) / len(services)
	}
	
	// Default progress estimation based on line count
	if len(output) < 10 {
		return 20
	} else if len(output) < 50 {
		return 50
	} else if len(output) < 100 {
		return 80
	}
	
	return 90
}

func (m Model) loadBackupStatus() tea.Cmd {
	return tea.Cmd(func() tea.Msg {
		// Try to load status from log files
		logDirs := []string{
			filepath.Join(m.shellPath, "logs"),
			filepath.Join(m.shellPath, "plex", "logs"),
			filepath.Join(m.shellPath, "immich_backups"),
		}

		for _, logDir := range logDirs {
			if _, err := os.Stat(logDir); os.IsNotExist(err) {
				continue
			}

			// Look for recent log files to determine last backup status
			files, err := os.ReadDir(logDir)
			if err != nil {
				continue
			}

			for _, file := range files {
				if strings.Contains(file.Name(), "backup") && strings.HasSuffix(file.Name(), ".log") {
					// Determine service from filename
					service := "unknown"
					if strings.Contains(file.Name(), "plex") {
						service = "plex"
					} else if strings.Contains(file.Name(), "immich") {
						service = "immich"
					} else if strings.Contains(file.Name(), "media") {
						service = "media"
					}

					// Get file info for last modified time
					info, err := file.Info()
					if err != nil {
						continue
					}

					// Update status based on recent activity
					if time.Since(info.ModTime()) < 24*time.Hour {
						if m.backupStatus[service] == nil {
							m.backupStatus[service] = &BackupStatus{}
						}
						m.backupStatus[service].Service = service
						m.backupStatus[service].LastRun = info.ModTime()
						m.backupStatus[service].Status = "idle" // Default to idle, will be updated if running
					}
				}
			}
		}

		return statusUpdatedMsg{}
	})
}

func (m Model) loadLogs() tea.Cmd {
	return tea.Cmd(func() tea.Msg {
		var logs []LogEntry

		// Load logs from various sources
		logFiles := []struct {
			path    string
			service string
		}{
			{filepath.Join(m.shellPath, "logs", "plex-backup.log"), "plex"},
			{filepath.Join(m.shellPath, "logs", "immich-backup.log"), "immich"},
			{filepath.Join(m.shellPath, "logs", "media-backup.log"), "media"},
		}

		for _, logFile := range logFiles {
			if content, err := os.ReadFile(logFile.path); err == nil {
				lines := strings.Split(string(content), "\n")
				for _, line := range lines {
					if strings.TrimSpace(line) == "" {
						continue
					}

					// Parse log line (basic parsing)
					parts := strings.SplitN(line, " - ", 2)
					if len(parts) == 2 {
						if timestamp, err := time.Parse("2006-01-02 15:04:05", parts[0]); err == nil {
							logs = append(logs, LogEntry{
								Timestamp: timestamp,
								Service:   logFile.service,
								Level:     "INFO",
								Message:   parts[1],
							})
						}
					}
				}
			}
		}

		// Update model logs
		m.logs = logs

		return logsUpdatedMsg{}
	})
}

// Helper function to create a visual progress bar
func createProgressBar(progress int) string {
	if progress < 0 {
		progress = 0
	}
	if progress > 100 {
		progress = 100
	}
	
	const barWidth = 30
	filled := (progress * barWidth) / 100
	empty := barWidth - filled
	
	bar := strings.Repeat("█", filled) + strings.Repeat("░", empty)
	return fmt.Sprintf("[%s]", bar)
}

// Start a progress ticker for time-based progress estimation
func (m Model) startProgressTicker(service string) tea.Cmd {
	return tea.Tick(time.Second*2, func(t time.Time) tea.Msg {
		// Check if backup is still running
		if status, exists := m.backupStatus[service]; exists && status.Status == "running" {
			elapsed := time.Since(status.StartTime)
			
			// Estimate progress based on typical backup durations
			var estimatedDuration time.Duration
			switch service {
			case "plex":
				estimatedDuration = 5 * time.Minute  // Plex backups typically take 3-8 minutes
			case "immich":
				estimatedDuration = 10 * time.Minute // Immich can take 5-15 minutes depending on data
			case "media":
				estimatedDuration = 3 * time.Minute  // Media services backup is usually faster
			default:
				estimatedDuration = 5 * time.Minute
			}
			
			// Calculate progress (cap at 95% until actual completion)
			progress := int((elapsed.Seconds() / estimatedDuration.Seconds()) * 95)
			if progress > 95 {
				progress = 95
			}
			
			return backupProgressMsg{
				service:  service,
				progress: progress,
				output:   fmt.Sprintf("Backup in progress... (%s elapsed)", elapsed.Round(time.Second)),
			}
		}
		return nil
	})
}

func main() {
	p := tea.NewProgram(initialModel(), tea.WithAltScreen())
	if _, err := p.Run(); err != nil {
		log.Fatal(err)
	}
}