hosts-go/internal/tui/update.go

package tui

import (
	"fmt"

	"hosts-go/internal/core"

	tea "github.com/charmbracelet/bubbletea"
)

// Update handles all messages for the TUI.
func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var cmd tea.Cmd
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "q", "ctrl+c":
			return m, tea.Quit
		case "tab":
			if m.focus == listPane {
				m.focus = detailPane
			} else {
				m.focus = listPane
			}
		case "ctrl+e":
			if m.mode == ViewMode {
				m.mode = EditMode
			} else {
				m.mode = ViewMode
			}
		case "ctrl+s":
			if m.mode == EditMode && m.hostsPath != "" {
				if err := core.WriteHostsFile(m.hostsPath, m.hosts); err != nil {
					fmt.Println("save failed:", err)
				}
			}
		case " ":
			if m.mode == EditMode {
				if entry := m.SelectedEntry(); entry != nil {
					entry.Active = !entry.Active
					m.list.SetItem(m.list.Index(), entryItem{entry})
					m.refreshDetail()
				}
			}
		case "up", "k":
			if m.focus == detailPane {
				m.detail.ScrollUp(1)
			} else {
				m.list, cmd = m.list.Update(msg)
				m.refreshDetail()
			}
			return m, cmd
		case "down", "j":
			if m.focus == detailPane {
				m.detail.ScrollDown(1)
			} else {
				m.list, cmd = m.list.Update(msg)
				m.refreshDetail()
			}
			return m, cmd
		}
		if m.focus == listPane {
			m.list, cmd = m.list.Update(msg)
			m.refreshDetail()
		}
	case tea.WindowSizeMsg:
		m.width = msg.Width
		m.height = msg.Height - 1

		leftWidth := msg.Width / 2
		rightWidth := msg.Width - leftWidth
		leftHeight := m.height
		rightHeight := m.height

		if m.focus == listPane {
			leftWidth -= 2
			leftHeight -= 2
		} else {
			rightWidth -= 2
			rightHeight -= 2
		}

		leftWidth -= 2
		rightWidth -= 2

		m.list.SetSize(leftWidth, leftHeight)
		m.detail.Width = rightWidth
		m.detail.Height = rightHeight

		if m.focus == listPane {
			m.list, cmd = m.list.Update(msg)
		}
	default:
		if m.focus == listPane {
			m.list, cmd = m.list.Update(msg)
			m.refreshDetail()
		}
	}
	return m, cmd
}