package ui

import (
	"strings"
	"testing"

	"github.com/rivo/tview"
)

func TestRenderHelpFitsAndAligns(t *testing.T) {
	for _, width := range []int{40, 60, 76, 96} {
		text := renderHelp(width)
		var inItem bool
		for i, line := range strings.Split(text, "\n") {
			if w := tview.TaggedStringWidth(line); w > width {
				t.Errorf("width %d, line %d is %d columns wide: %q", width, i, w, line)
			}
			plain := plainText(line)
			// Descriptions wrap under themselves: a continuation line starts with
			// spaces up to the description column, never at the left edge.
			switch {
			case plain == "":
				inItem = false
			case !strings.HasPrefix(plain, " "):
				inItem = false // a section title
			case strings.HasPrefix(plain, strings.Repeat(" ", 2+helpKeyWidth)) && strings.TrimSpace(plain) != "":
				if !inItem {
					t.Errorf("width %d: continuation without an item before it: %q", width, plain)
				}
			default:
				inItem = true
			}
		}
		// Nothing is lost.
		for _, sec := range helpSections {
			if !strings.Contains(text, sec.title) {
				t.Errorf("width %d: section %q missing", width, sec.title)
			}
			for _, it := range sec.items {
				first := strings.Fields(it.desc)[0]
				if !strings.Contains(plainText(text), first) {
					t.Errorf("width %d: description of %q lost", width, it.keys)
				}
			}
		}
	}
}

func TestRenderHelpKeepsEveryWord(t *testing.T) {
	desc := "Changes apply live behind the dialog, also while you move through an open list"
	words := strings.Fields(desc)
	text := plainText(renderHelp(50))
	// Join the wrapped lines of the long Library "F" description and look for every word in order.
	pos := 0
	for _, w := range words {
		i := strings.Index(text[pos:], w)
		if i < 0 {
			t.Fatalf("word %q missing or out of order", w)
		}
		pos += i + len(w)
	}
}