package tui

import (
	"fmt"
	"strings"

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

	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
)

// HostListTab is the host list tab
type HostListTab struct {
	hosts         []*models.Host
	selectedIndex int
	err           error
	width         int
	height        int
}

// NewHostListTab creates a new host list tab
func NewHostListTab() *HostListTab {
	return &HostListTab{
		selectedIndex: 0,
	}
}

// Init initializes the tab
func (t *HostListTab) Init() tea.Cmd {
	return nil
}

// Name returns the tab name
func (t *HostListTab) Name() string {
	return "Hosts"
}

// Update handles messages for the host list
func (t *HostListTab) Update(msg tea.Msg) (Tab, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		t.width = msg.Width
		t.height = msg.Height

	case tea.KeyMsg:
		switch msg.String() {
		case "up", "k":
			if t.selectedIndex > 0 {
				t.selectedIndex--
			}

		case "down", "j":
			if t.selectedIndex < len(t.hosts)-1 {
				t.selectedIndex++
			}

		case "enter", " ":
			if len(t.hosts) > 0 {
				host := t.hosts[t.selectedIndex]
				return t, func() tea.Msg {
					return sshConnectToMsg{host: host}
				}
			}

		case "ctrl+n":
			return t, func() tea.Msg {
				return openHostFormMsg{}
			}

		case "ctrl+e":
			if len(t.hosts) > 0 {
				host := t.hosts[t.selectedIndex]
				return t, func() tea.Msg {
					return openHostFormMsg{editing: host}
				}
			}

		case "ctrl+f":
			if len(t.hosts) > 0 {
				host := t.hosts[t.selectedIndex]
				return t, func() tea.Msg {
					return openSFTPMsg{host: host}
				}
			}

		case "ctrl+k":
			return t, func() tea.Msg {
				return openKeyListMsg{}
			}

		case "ctrl+p":
			return t, func() tea.Msg {
				return openSnippetListMsg{}
			}

		case "q", "ctrl+c":
			return t, func() tea.Msg {
				return quitMsg{}
			}
		}
	}

	return t, nil
}

// View renders the host list
func (t *HostListTab) View() string {
	availW := t.width
	if availW < 40 {
		availW = 80
	}

	cardW := availW - 6
	if cardW > 74 {
		cardW = 74
	}
	if cardW < 30 {
		cardW = 30
	}

	var b strings.Builder

	// Capped vertical padding
	b.WriteString(strings.Repeat("\n", 2))

	// Title
	b.WriteString(centerText(AppTitleStyle.Render(" HOSTKEEPER - SSH Manager "), availW))
	b.WriteString("\n\n")

	if len(t.hosts) == 0 {
		b.WriteString(centerText(SubtitleStyle.Render("No hosts found. Add with Ctrl+N"), availW))
		b.WriteString("\n")
	} else {
		for i, host := range t.hosts {
			entry := renderHostEntry(host, i == t.selectedIndex, cardW)
			// Center the card (which produces 4 lines) horizontally
			for _, line := range strings.Split(entry, "\n") {
				b.WriteString(centerText(line, availW))
				b.WriteString("\n")
			}
			b.WriteString("\n")
		}
	}

	return b.String()
}

// centerText centers a line of text horizontally within the given width,
// respecting ANSI escape codes for accurate display width.
func centerText(s string, width int) string {
	w := lipgloss.Width(s)
	if w >= width {
		return s
	}
	pad := strings.Repeat(" ", (width-w)/2)
	return pad + s
}

// Close is a no-op for host list tab
func (t *HostListTab) Close() {}

// SetHosts sets the host list
func (t *HostListTab) SetHosts(hosts []*models.Host) {
	t.hosts = hosts
	if len(hosts) > 0 && t.selectedIndex >= len(hosts) {
		t.selectedIndex = len(hosts) - 1
	}
}

// Hosts returns the host list
func (t *HostListTab) Hosts() []*models.Host {
	return t.hosts
}

// SelectedIndex returns the selected index
func (t *HostListTab) SelectedIndex() int {
	return t.selectedIndex
}

// FindHostListTab finds the first HostListTab in a list of tabs
func FindHostListTab(tabs []Tab) *HostListTab {
	for _, tab := range tabs {
		if ht, ok := tab.(*HostListTab); ok {
			return ht
		}
	}
	return nil
}

// renderHostEntry renders a single host as a card
func renderHostEntry(host *models.Host, selected bool, width int) string {
	// Build the card content
	var inner strings.Builder

	// First line: host name (bold)
	name := truncateString(host.Name, width-4)
	inner.WriteString(HostNameStyle.Render(" " + name))
	inner.WriteString("\n")

	// Second line: user@host:port with tags
	addr := fmt.Sprintf("%s@%s:%d", host.Username, host.Hostname, host.Port)
	if len(host.Tags) > 0 {
		addr += "  " + formatTagsForTUI(host.Tags)
	}
	inner.WriteString(HostDetailStyle.Render(" " + truncateString(addr, width-2)))

	cardStyle := HostCardStyle
	if selected {
		cardStyle = HostCardActiveStyle
	}

	return cardStyle.Width(width).Render(inner.String())
}

// truncateString truncates a string to the given max length, appending "…" if needed
func truncateString(s string, maxLen int) string {
	if maxLen < 1 {
		return ""
	}
	if len(s) <= maxLen {
		return s
	}
	return s[:maxLen-1] + "…"
}

// formatTagsForTUI formats tags for TUI display
func formatTagsForTUI(tags []string) string {
	if len(tags) == 0 {
		return ""
	}
	var formatted []string
	for _, tag := range tags {
		formatted = append(formatted, "["+tag+"]")
	}
	return strings.Join(formatted, " ")
}