#!/usr/bin/env bash

set -euo pipefail

readonly CONTAINER_NAME='umrechner-test'
readonly IMAGE_TAG='umrechner-test:latest'
readonly TEST_PORT='8888'
readonly TMP_DIR="/tmp/umrechner-test-$$"
readonly HTML_DIR="$TMP_DIR/html"

print_ok() {
	printf '  [OK] %s\n' "$1"
}

print_fail() {
	printf '  [FAIL] %s\n' "$1" >&2
}

cleanup() {
	echo '[cleanup] removing test resources...'
	docker rm -f "$CONTAINER_NAME" >/dev/null 2>&1 || true
	docker rmi -f "$IMAGE_TAG" >/dev/null 2>&1 || true
	# HTML_DIR is kept for inspection
	# shellcheck disable=SC2115
	rm -rf "$TMP_DIR"
}

# shellcheck disable=SC2317
cleanup_containers() {
	docker rm -f "$CONTAINER_NAME" >/dev/null 2>&1 || true
	docker rmi -f "$IMAGE_TAG" >/dev/null 2>&1 || true
}

trap cleanup_containers EXIT

echo '=== Stage 1: Docker Build ==='
docker build -t "$IMAGE_TAG" .
print_ok 'docker build completed'

echo ''
echo '=== Stage 2: Artefact Validation ==='
mkdir -p "$TMP_DIR"
docker create --name "$CONTAINER_NAME" "$IMAGE_TAG" >/dev/null
docker cp "$CONTAINER_NAME:/usr/share/nginx/html" "$HTML_DIR"
docker rm "$CONTAINER_NAME" >/dev/null

required_files=(
	'index.html'
	'css/main.min.css'
	'robots.txt'
)

for file in "${required_files[@]}"; do
	path="$HTML_DIR/$file"
	if [ ! -f "$path" ]; then
		print_fail "missing required file: $file"
		exit 1
	fi
	size=$(wc -c <"$path" | tr -d ' ')
	print_ok "$file exists ($size bytes)"
done

sample_page=$(find "$HTML_DIR" -mindepth 2 -name 'index.html' -print -quit)
if [ -z "$sample_page" ]; then
	print_fail 'no conversion pages found'
	exit 1
fi
sample_dir=$(dirname "$sample_page")
sample_path="${sample_dir#$HTML_DIR}/"
print_ok "conversion page found: $sample_path"

echo ''
echo '=== Stage 3: HTTP Smoke Test ==='
docker run -d --name "$CONTAINER_NAME" \
	-p "$TEST_PORT:80" "$IMAGE_TAG" >/dev/null

for i in $(seq 1 10); do
	if curl -sf "http://localhost:$TEST_PORT/" >/dev/null; then
		break
	fi
	if [ "$i" -eq 10 ]; then
		print_fail 'server did not respond in time'
		exit 1
	fi
	sleep 1
done
print_ok 'server is responding'

endpoints=(
	'/'
	'/css/main.min.css'
	'/robots.txt'
	"$sample_path"
)

for endpoint in "${endpoints[@]}"; do
	status=$(curl -s -o /dev/null -w '%{http_code}' \
		"http://localhost:$TEST_PORT$endpoint")
	if [ "$status" != '200' ]; then
		print_fail "$endpoint returned HTTP $status"
		exit 1
	fi
	print_ok "$endpoint returned HTTP 200"
done

title='Umrechnung von Maßeinheiten'
if ! curl -sf "http://localhost:$TEST_PORT/" | grep -q "$title"; then
	print_fail 'index page missing expected title'
	exit 1
fi
print_ok 'index page contains expected title'

echo ''
echo 'All tests passed!'
echo ''
echo "=== Generated artefacts (kept for inspection) ==="
printf '  Path: %s\n' "$HTML_DIR"
printf '  Files: %s\n' "$(find "$HTML_DIR" -type f | wc -l)"
printf '  Sample links from index.html:\n'
grep -oE 'href=[^[:space:]>]+' "$HTML_DIR/index.html" | sed 's/href=//' | sort -u | head -20 | sed 's/^/    /'