package input

import (
	"errors"
	"strings"

	tea "charm.land/bubbletea/v2"
	"charm.land/lipgloss/v2"
	ilovetui "github.com/anotherhadi/ilovetui"
	"github.com/anotherhadi/settuings/internal/input"
)

func windowStyle() lipgloss.Style {
	return lipgloss.NewStyle().
		Border(lipgloss.RoundedBorder()).
		BorderForeground(ilovetui.S.Subtle).
		Padding(1, 2)
}

func (m Model) View() tea.View {
	statusBar := m.renderStatusBar()
	innerW, innerH := m.contentBudget()
	tabBar := renderTabBar(innerW)

	var body string
	switch {
	case !m.checked:
		body = ilovetui.S.Faint.Render("Checking hyprctl…")
	case m.checkErr != nil:
		body = m.renderUnavailable()
	default:
		body = m.renderBody(innerW)
	}

	box := lipgloss.NewStyle().Width(innerW).Height(innerH).Render(body)
	content := windowStyle().Render(lipgloss.JoinVertical(lipgloss.Left, tabBar, box))

	return tea.NewView(lipgloss.JoinVertical(lipgloss.Left, content, statusBar))
}

func (m Model) renderStatusBar() string {
	km := inputKeyMap{m: m, width: m.width}
	return lipgloss.NewStyle().Padding(0, 1).Render(m.help.View(km))
}

// contentBudget returns the exact space available inside the bordered page
// box, below the tab bar and above the status bar.
func (m Model) contentBudget() (w, h int) {
	frameW := windowStyle().GetHorizontalFrameSize()
	frameH := windowStyle().GetVerticalFrameSize()
	w = m.width - frameW

	statusH := strings.Count(m.renderStatusBar(), "\n") + 1
	tabBarH := lipgloss.Height(renderTabBar(w))

	h = m.height - tabBarH - frameH - statusH
	if h < 1 {
		h = 1
	}
	return w, h
}

// renderBody lays out the two sections side by side once there's enough
// width for both to breathe, and stacks them otherwise.
func (m Model) renderBody(width int) string {
	const splitThreshold = 60
	const gap = 3

	_, height := m.contentBudget()

	if width < splitThreshold {
		return lipgloss.JoinVertical(lipgloss.Left, m.renderLayout(width, height/2), "", m.renderMouse(width))
	}

	leftW := width * 3 / 5
	if leftW < 30 {
		leftW = 30
	}
	rightW := width - leftW - gap
	left := lipgloss.NewStyle().Width(leftW).Render(m.renderLayout(leftW, height))
	right := lipgloss.NewStyle().Width(rightW).Render(m.renderMouse(rightW))
	return lipgloss.JoinHorizontal(lipgloss.Top, left, strings.Repeat(" ", gap), right)
}

func (m Model) renderUnavailable() string {
	title := lipgloss.NewStyle().Bold(true).Foreground(ilovetui.S.Error).Render("Inputs page unavailable")

	var hint string
	switch {
	case errors.Is(m.checkErr, input.ErrNotFound):
		hint = "hyprctl was not found in PATH. This page only works under Hyprland."
	default:
		hint = m.checkErr.Error()
	}

	return lipgloss.JoinVertical(lipgloss.Left,
		title,
		"",
		subtleStyle().Render(hint),
		"",
		mutedStyle().Render("Retrying automatically…"),
	)
}