#!/usr/bin/env bash
# theme.css overrides a vendor stylesheet it does not control, and the way that
# goes wrong is silent: the rule is there, the page still looks like Suramadu.
#
# It went wrong exactly once already. Upstream paints the modal twice, at two
# different depths, and styles every link pseudo-class - so a two-class override
# and a bare `a` both lost, and the dialog stayed white with an orange link.
#
# The convention that fixes it is a :root prefix on every rule, which outranks
# anything in style.css without !important. This checks the convention holds.
set -uo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
CSS="$ROOT/suramadu/web/theme.css"

pass=0; fail=0
check() { if "${@:2}"; then echo "ok    $1"; pass=$((pass+1)); else echo "FAIL  $1"; fail=$((fail+1)); fi; }

[ -f "$CSS" ] || { echo "FAIL  theme.css is missing"; exit 1; }

# Selector lines are the ones ending in { or , outside a declaration block.
# Comments and declarations are skipped; :root {...} itself is the one rule
# allowed to stand alone, since it only declares custom properties.
#
# At-rule preludes are skipped too. `@media ... {` ends in a brace and would
# read as a bare selector, but it is not one: it opens a block whose selectors
# are checked on their own lines, and nothing about it can lose a specificity
# fight. The rule the check exists for is unchanged - every selector, including
# the ones nested inside an at-rule, still has to start with :root.
mapfile -t bare < <(
  awk '
    /\/\*/ { inc = 1 }
    inc    { if (/\*\//) inc = 0; next }
    /^[[:space:]]*$/ { next }
    /^[[:space:]]*@/ { next }
    /^[[:space:]]*:root[[:space:]]*\{/ { next }
    /[{,][[:space:]]*$/ {
      line = $0
      sub(/^[[:space:]]+/, "", line)
      if (line !~ /^:root/) print line
    }
  ' "$CSS"
)

check "every selector is prefixed with :root" test "${#bare[@]}" -eq 0
if [ "${#bare[@]}" -ne 0 ]; then
  printf '      %s\n' "${bare[@]}"
  echo "      Without it the rule loses to style.css and silently does nothing."
fi

# The two upstream patterns that beat the first attempt.
check "the deeper .suramadu-element-content modal scoping is covered" \
  grep -q '\.suramadu-element \.suramadu-element-content \.ws-modal' "$CSS"
check "link pseudo-classes are covered, not just a bare a" \
  grep -q 'a:link' "$CSS"

# No !important: if a rule needs it, the selector is wrong. Comments are
# stripped first - this file's own commentary mentions the word.
NOCOMMENT="$(mktemp)"
trap 'rm -f "$NOCOMMENT"' EXIT
awk '/\/\*/ { inc = 1 } inc { if (/\*\//) inc = 0; next } { print }' "$CSS" > "$NOCOMMENT"
check "no !important in any declaration" bash -c "! grep -q '!important' '$NOCOMMENT'"

echo
echo "$pass passed, $fail failed"
[ "$fail" -eq 0 ]