#!/usr/bin/env bash
#
# Lighthouse run against the production image, reproducing the measurement
# behind MAN-109. Not a CI gate — SPEC.md §14.1 pins the five blocking jobs and
# §22 governs when new capability is added. This is the recipe so the numbers
# can be reproduced instead of remembered.
#
# Usage:
#   scripts/perf/lighthouse.sh [output-dir]
#
# Environment:
#   BASE_URL   origin to audit                 (default http://127.0.0.1:8000)
#   TARGET     label for the output subtree     (default local)
#   RUNS       runs per page and preset         (default 3)
#   PRESETS    space-separated preset list      (default "mobile desktop")
#
# Lighthouse LCP moves by a few tenths of a second between runs on the same
# build, so a single run cannot support a before/after comparison. Every page
# is audited RUNS times per preset and the run holding the median LCP is the
# one reported — averaging across runs would describe a page that never
# existed.
#
# Expects a site already answering on $BASE_URL. To raise one from scratch:
#
#   docker build -t amare-app:ci .
#   docker run -d --name amare-web -p 8000:8000 \
#     -e APP_ENV=production -e APP_DEBUG=false -e APP_KEY="$APP_KEY" \
#     -e DB_CONNECTION=pgsql -e DB_HOST=host.docker.internal -e DB_PORT=5432 \
#     -e DB_DATABASE=amare -e DB_USERNAME=amare -e DB_PASSWORD=secret \
#     -e SESSION_DRIVER=database -e CACHE_STORE=database -e QUEUE_CONNECTION=database \
#     --add-host=host.docker.internal:host-gateway \
#     -v "$(pwd)/storage/app/public:/app/storage/app/public" \
#     amare-app:ci
#
# Seed content and generate the responsive variants first, and run both from
# the host rather than inside the container. ContentSeeder guards itself with
# an allow-list of local/staging/testing (database/seeders/ContentSeeder.php),
# so under the container's APP_ENV=production it is a deliberate no-op and
# Lighthouse would end up measuring empty pages. Skipping
# `media:generate-variants` inflates LCP by roughly 2.5 s on the home page,
# because the originals are served at full size:
#
#   php artisan db:seed --class=ContentSeeder --force
#   php artisan media:generate-variants
#
set -euo pipefail

BASE_URL="${BASE_URL:-http://127.0.0.1:8000}"
BASE_URL="${BASE_URL%/}"
TARGET="${TARGET:-local}"
RUNS="${RUNS:-3}"
PRESETS="${PRESETS:-mobile desktop}"
OUT_DIR="${1:-storage/app/lighthouse}/${TARGET}"

# Lighthouse needs a Chrome binary. Playwright's is already on disk after
# `npx playwright install chromium`; fall back to a system Chrome.
if [[ -z "${CHROME_PATH:-}" ]]; then
    PLAYWRIGHT_CHROME=$(find "${HOME}/Library/Caches/ms-playwright" "${HOME}/.cache/ms-playwright" \
        -maxdepth 3 -name 'Google Chrome for Testing' -type f 2>/dev/null | head -1 || true)

    if [[ -n "${PLAYWRIGHT_CHROME}" ]]; then
        export CHROME_PATH="${PLAYWRIGHT_CHROME}"
    fi
fi

mkdir -p "${OUT_DIR}"

PAGES=(
    "/:home"
    "/servicos:servicos"
    "/portfolio:portfolio"
    "/portfolio/casamento-ana-lucas:portfolio-detalhe"
    "/sobre:sobre"
    "/contato:contato"
)

# A route that answers 404 still produces a Lighthouse report, and the error
# page is light enough to score well — the heaviest route on the site would be
# reported as excellent and nobody would notice. Refuse to measure anything
# that is not a 200 before spending minutes on the audit.
echo "preflight against ${BASE_URL}"

for entry in "${PAGES[@]}"; do
    path="${entry%%:*}"
    code="$(curl -sS -o /dev/null -w '%{http_code}' --max-time 20 "${BASE_URL}${path}" 2>/dev/null || true)"

    if [[ "${code}" != "200" ]]; then
        echo "preflight failed: ${BASE_URL}${path} answered HTTP ${code:-<none>}, expected 200" >&2
        exit 1
    fi

    echo "  ok ${path}"
done

for preset in ${PRESETS}; do
    # The mobile preset is Lighthouse's default and rejects an explicit
    # --preset flag, so only desktop is passed through.
    preset_flags=()
    if [[ "${preset}" != "mobile" ]]; then
        preset_flags+=("--preset=${preset}")
    fi

    for entry in "${PAGES[@]}"; do
        path="${entry%%:*}"
        name="${entry##*:}"

        for run in $(seq 1 "${RUNS}"); do
            echo "auditing ${name} ${preset} run ${run}/${RUNS} (${BASE_URL}${path})"

            # Default preset: simulated mobile throttling, 150 ms RTT,
            # ~1.6 Mbps, 4x CPU slowdown.
            # ${array[@]+...} keeps `set -u` from treating an empty array as
            # unbound, which bash 3.2 (the macOS system bash) still does.
            npx --yes lighthouse@12 "${BASE_URL}${path}" \
                --quiet \
                ${preset_flags[@]+"${preset_flags[@]}"} \
                --output=json --output=html \
                --output-path="${OUT_DIR}/${name}-${preset}-run${run}" \
                --chrome-flags="--headless=new --no-sandbox"
        done
    done
done

echo
echo "reports written to ${OUT_DIR}"

# The seeder is recorded because it decides the byte weight of every hero
# image: a before/after comparison across different fixtures measures nothing.
node scripts/perf/summarize-lighthouse.mjs "${OUT_DIR}" \
    --target="${TARGET}" \
    --base-url="${BASE_URL}" \
    --commit="$(git rev-parse --short HEAD 2>/dev/null || echo unknown)$(git diff --quiet HEAD 2>/dev/null || echo '+alterações não commitadas')" \
    --seeder="${SEEDER:-ContentSeeder}" \
    > "${OUT_DIR}/summary.md"

echo "summary written to ${OUT_DIR}/summary.md"
echo "SPEC.md §6.6 targets: LCP <= 2.5s, CLS <= 0.1, INP <= 200ms, 0 console errors"