#!/usr/bin/env bash
set -euo pipefail
shopt -s nullglob globstar

css_files=(assets/*.css assets/components/*.css)
js_files=(assets/*.js assets/components/*.js)

# Classes other code depends on, which nothing here styles: Cloudflare's
# Turnstile script finds its widget by this one.
external_classes="cf-turnstile"

css_classes=$(
    {
        cat "${css_files[@]}"
        # Components' own styles, in their shadow roots: the css`...` templates
        # in their scripts.
        awk '/css`/ { inside = 1 } inside { print } /`;/ { inside = 0 }' "${js_files[@]}"
    } \
        | sed -E 's/url\([^)]*\)//g; s/format\([^)]*\)//g' \
        | { grep -ohE '\.[a-zA-Z_][a-zA-Z0-9_-]*' || true; } \
        | sed 's/^\.//'
    echo "$external_classes" | tr ' ' '\n'
)
css_classes=$(echo "$css_classes" | sort -u)

source_classes=$(
    # Maud dot syntax (hyphenated only, outside quotes)
    sed -E 's/"[^"]*"//g' src/**/*.rs \
        | { grep -ohE '\.[a-zA-Z][a-zA-Z0-9]*(-[a-zA-Z0-9]+)+' || true; } \
        | sed 's/^\.//'

    # class="..." attributes
    { grep -ohE 'class="[^"]*"' src/**/*.rs "${js_files[@]}" || true; } \
        | sed 's/class="//;s/"$//' \
        | tr ' ' '\n' \
        | { grep -E '^[a-zA-Z]' || true; }

    # JS classList methods
    { grep -ohE 'classList\.(add|remove|toggle|contains)\("[^"]*"\)' "${js_files[@]}" || true; } \
        | { grep -ohE '"[^"]*"' || true; } \
        | tr -d '"'
)

source_classes=$(echo "$source_classes" | sort -u)

exit_code=0

for class in $css_classes; do
    if ! grep -rql --include='*.rs' --include='*.js' --exclude-dir=lib "$class" src/ assets/ > /dev/null 2>&1; then
        echo "CSS class .$class unused"
        exit_code=1
    fi
done

for class in $source_classes; do
    if ! echo "$css_classes" | grep -qxF "$class"; then
        echo "CSS class .$class used but not defined"
        exit_code=1
    fi
done

exit $exit_code