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", "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 — exactly like tamagosh
func (t *HostListTab) View() string {
	var b strings.Builder

	// Error display
	if t.err != nil {
		b.WriteString(ErrorStyle.Render(fmt.Sprintf(" Error: %v ", t.err)))
		b.WriteString("\n")
		t.err = nil
	}

	if len(t.hosts) == 0 {
		msg := SubtitleStyle.Render("(no connections — press Ctrl+N to add)")
		b.WriteString(lipgloss.PlaceHorizontal(t.width, lipgloss.Center, msg))
		return b.String()
	}

	// Build rows (plain + styled)
	type styledRow struct {
		text  string
		plain string
	}
	var rows []styledRow

	// Scrolling
	availH := t.height - 10
	if availH < 1 {
		availH = 1
	}
	maxHosts := availH
	if maxHosts > len(t.hosts) {
		maxHosts = len(t.hosts)
	}

	start := t.selectedIndex - maxHosts/2
	if start < 0 {
		start = 0
	}
	if start+maxHosts > len(t.hosts) {
		start = len(t.hosts) - maxHosts
	}

	for i := start; i < start+maxHosts; i++ {
		host := t.hosts[i]

		// tamagosh format: "  %-12s %-18s :%d"
		raw := fmt.Sprintf("  %-12s %-18s :%d", host.Name, host.Hostname, host.Port)

		var styled string
		if i == t.selectedIndex {
			styled = lipgloss.NewStyle().
				Foreground(gbFg).
				Background(gbBgSel).
				Bold(true).
				Render("▸ " + strings.TrimLeft(raw, " "))
		} else {
			styled = lipgloss.NewStyle().Foreground(gbFg).Render(raw)
		}
		rows = append(rows, styledRow{text: styled, plain: raw})
	}

	// Footer
	var footer styledRow
	footerText := "[n]ew [e]dit [d]el [f]sftp [K]eygen [/]find [q]uit  Ctrl+Tab:switch  Ctrl+Q:close"
	footer = styledRow{text: SubtitleStyle.Render(footerText), plain: footerText}
	rows = append(rows, footer) // for widest measurement

	// Title
	title := lipgloss.NewStyle().Bold(true).Foreground(gbYellow).Render("Connection List")
	titlePlain := "Connection List"

	// tamagosh: widest content line drives the box's natural width
	widestRow := 0
	for _, r := range rows {
		if w := lipgloss.Width(r.plain); w > widestRow {
			widestRow = w
		}
	}
	contentW := widestRow
	if w := lipgloss.Width(footer.plain); w > contentW {
		contentW = w
	}
	if w := lipgloss.Width(titlePlain); w > contentW {
		contentW = w
	}
	const sidePad = 6
	targetW := contentW + sidePad*2

	// Uniform left shift for the row block
	rowShift := (targetW - widestRow) / 2

	var content strings.Builder

	// Centered title
	content.WriteString(lipgloss.PlaceHorizontal(targetW, lipgloss.Center, title))
	content.WriteString("\n\n")

	// Centered rows
	shift := strings.Repeat(" ", rowShift)
	for _, r := range rows[:len(rows)-1] { // exclude footer, added below
		line := lipgloss.PlaceHorizontal(targetW, lipgloss.Left, shift+r.text)
		content.WriteString(line)
		content.WriteString("\n")
	}
	content.WriteString("\n")

	// Centered footer
	content.WriteString(lipgloss.PlaceHorizontal(targetW, lipgloss.Center, footer.text))

	// Wrap in a rounded border box
	box := BorderStyle.Render(content.String())

	// Center the whole box horizontally
	b.WriteString(lipgloss.PlaceHorizontal(t.width, lipgloss.Center, box))

	return b.String()
}

// 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
}

// 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, " ")
}