package guards

import (
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"testing"

	"amadan.net/oficina/estilo.git/chrome"
)

// TestTheAccountIsReachableOnNarrowScreens is the guard for a bug that
// once removed sign-out from every phone.
//
// It used to pin rastrillo's topbar mechanics: [rst-shell-tail] is
// display: none below 800px and only an [rst-shell-menu] immediately
// before it could reveal it, so an app without that element had no
// account menu — and no Sign out — on a phone. The bar is estilo's now
// (shared chrome spec §5), and the same promise has a different shape:
// below 800px the bar folds its nav and page actions into the Menu
// sheet, and the account never folds at all. Sign out is two taps at
// every width.
//
// Two assertions, because either alone is satisfiable while the bug is
// back: the layout must render estilo's bar (and none of the old shell,
// whose tail would hide an account put there), and estilo's narrow rule
// must hide only the nav and the actions.
func TestTheAccountIsReachableOnNarrowScreens(t *testing.T) {
	b, err := os.ReadFile(filepath.Join(repoRoot(t), "internal/sheets/templates/layout.html"))
	if err != nil {
		t.Fatal(err)
	}
	// Template comments are stripped FIRST: the layout explains the old
	// shell in prose, and a check over the raw file would pass on it.
	layout := regexp.MustCompile(`(?s)\{\{/\*.*?\*/\}\}`).ReplaceAllString(string(b), "")
	if !strings.Contains(layout, `{{template "estilo-bar" .Frame.Chrome}}`) {
		t.Fatal("layout.html does not render estilo's bar; whatever replaced it must keep the account reachable below 800px")
	}
	if strings.Contains(layout, "rst-shell-") {
		t.Fatal("layout.html still writes rastrillo's topbar shell, whose tail hides everything in it below 800px")
	}

	css := string(chrome.CSS())
	narrow := regexp.MustCompile(`(?s)@media \(max-width: 799\.98px\)\s*\{(.*?)\n\}`).FindAllStringSubmatch(css, -1)
	if len(narrow) == 0 {
		t.Fatal("estilo's chrome.css has no narrow media query; this test is reading the wrong stylesheet")
	}
	for _, block := range narrow {
		for _, rule := range regexp.MustCompile(`([^{}]+)\{([^{}]*)\}`).FindAllStringSubmatch(block[1], -1) {
			if !strings.Contains(rule[2], "display: none") {
				continue
			}
			for _, part := range strings.Split(rule[1], ",") {
				sel := strings.TrimSpace(part)
				if strings.Contains(sel, "estilo-account") || strings.Contains(sel, "estilo-switcher") || strings.Contains(sel, "estilo-bar-end") {
					t.Errorf("estilo hides %q below 800px: the account (and Sign out) must never fold away", sel)
				}
			}
		}
	}
}