package tui

// An example Bubble Tea server. This will put an ssh session into alt screen
// and continually print up to date terminal information.

import (
	"fmt"
	"io/fs"
	"net"

	"git.sr.ht/~a73x/home"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/glamour"
	"github.com/charmbracelet/lipgloss"
	"github.com/charmbracelet/log"
	"github.com/charmbracelet/ssh"
	"github.com/charmbracelet/wish"
	"github.com/charmbracelet/wish/activeterm"
	"github.com/charmbracelet/wish/bubbletea"
	"github.com/charmbracelet/wish/logging"
)

func New(host, port string) (*ssh.Server, error) {
	s, err := wish.NewServer(
		wish.WithAddress(net.JoinHostPort(host, port)),
		wish.WithHostKeyPath(".ssh/id_ed25519"),
		wish.WithMiddleware(
			bubbletea.Middleware(teaHandler),
			activeterm.Middleware(), // Bubble Tea apps usually require a PTY.
			logging.Middleware(),
		),
	)
	if err != nil {
		log.Error("Could not start server", "error", err)
	}

	return s, err
}

// You can wire any Bubble Tea model up to the middleware with a function that
// handles the incoming ssh.Session. Here we just grab the terminal info and
// pass it to the new model. You can also return tea.ProgramOptions (such as
// tea.WithAltScreen) on a session by session basis.
func teaHandler(s ssh.Session) (tea.Model, []tea.ProgramOption) {
	// This should never fail, as we are using the activeterm middleware.
	pty, _, _ := s.Pty()

	// When running a Bubble Tea app over SSH, you shouldn't use the default
	// lipgloss.NewStyle function.
	// That function will use the color profile from the os.Stdin, which is the
	// server, not the client.
	// We provide a MakeRenderer function in the bubbletea middleware package,
	// so you can easily get the correct renderer for the current session, and
	// use it to create the styles.
	// The recommended way to use these styles is to then pass them down to
	// your Bubble Tea model.
	renderer := bubbletea.MakeRenderer(s)
	txtStyle := renderer.NewStyle().Foreground(lipgloss.Color("10"))
	quitStyle := renderer.NewStyle().Foreground(lipgloss.Color("8"))

	bg := "light"
	if renderer.HasDarkBackground() {
		bg = "dark"
	}

	posts, err := home.Content.ReadDir("posts")
	if err != nil {
		// fk knows
	}

	postFiles := make([]string, 0, len(posts))
	for _, post := range posts {
		postFiles = append(postFiles, "posts/"+post.Name())
	}

	m := model{
		term:      pty.Term,
		profile:   renderer.ColorProfile().Name(),
		width:     pty.Window.Width,
		height:    pty.Window.Height,
		bg:        bg,
		txtStyle:  txtStyle,
		quitStyle: quitStyle,
		posts:     postFiles,
	}
	return m, []tea.ProgramOption{tea.WithAltScreen()}
}

// Just a generic tea.Model to demo terminal information of ssh.
type model struct {
	term      string
	profile   string
	width     int
	height    int
	bg        string
	txtStyle  lipgloss.Style
	quitStyle lipgloss.Style
	posts     []string
	cursor    int
	viewer    *PostModel
	err       error
}

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

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

	if m.viewer != nil {
		switch msg := msg.(type) {
		case tea.KeyMsg:
			switch msg.String() {
			case "q", "ctrl+c":
				m.viewer = nil
				return m, nil
			case "esc":
				return m, nil
			}
		}
		viewer, cmd := m.viewer.Update(msg)
		m.viewer = &viewer
		return m, cmd
	}

	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		m.height = msg.Height
		m.width = msg.Width
	case tea.KeyMsg:
		switch msg.String() {
		case "q", "ctrl+c":
			return m, tea.Quit
		case "up", "k":
			if m.cursor > 0 {
				m.cursor--
			}
		case "down", "j":
			if m.cursor < len(m.posts)-1 {
				m.cursor++
			}
		case "enter":
			content, err := fs.ReadFile(home.Content, m.posts[m.cursor])
			if err != nil {
				m.err = err
				return m, nil
			}

			out, err := glamour.Render(string(content), "dark")
			if err != nil {
				m.err = err
				return m, nil
			}

			m.viewer = &PostModel{
				content: out,
			}
			fakeWindowMsg := tea.WindowSizeMsg{
				Width:  m.width,
				Height: m.height - 1,
			}

			viewer, cmd := m.viewer.Update(fakeWindowMsg)
			m.viewer = &viewer
			return m, cmd
		}
	}

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

func (m model) View() string {
	if m.err != nil {
		return m.err.Error()
	}

	if m.viewer != nil {
		return m.viewer.View() + "\n arrow keys to scroll and q to go back"
	}

	s := "a73x\n\n"
	for i, choice := range m.posts {
		// Is the cursor pointing at this choice?
		cursor := " " // no cursor
		if m.cursor == i {
			cursor = ">" // cursor!
		}

		// Render the row
		s += fmt.Sprintf("%s %s\n", cursor, choice)
	}
	s += "\narrow keys to select post and enter to select"
	s += "\npress q to quit"

	return s
}