import gzip
import re
import shutil
from pathlib import Path

import pytest

from src.frontend_bundle import build_frontend
from src.views import dashboard, runtime_bundle, service_worker


FRONTEND = Path(__file__).resolve().parents[1] / "frontend"
PAGE_SCRIPT = re.compile(r'<script src="(static/[^"]+\.js)"></script>')


def test_page_runtime_is_one_deterministic_content_addressed_bundle(tmp_path):
    first = build_frontend(FRONTEND)
    second = build_frontend(FRONTEND)

    assert first.runtime_name == second.runtime_name
    assert first.runtime_bytes == second.runtime_bytes
    assert PAGE_SCRIPT.findall(first.dashboard_html) == []
    assert first.dashboard_html.count("<script src=") == 1
    assert f'<script src="{first.runtime_name}"></script>' in first.dashboard_html
    assert first.runtime_name.startswith("runtime-")
    assert first.runtime_name.endswith(".js")
    assert len(gzip.compress(first.runtime_bytes, mtime=0)) <= 100 * 1024

    changed_frontend = tmp_path / "frontend"
    shutil.copytree(FRONTEND, changed_frontend)
    (changed_frontend / "widgets.js").write_text(
        (changed_frontend / "widgets.js").read_text() + "\n// changed\n"
    )

    changed = build_frontend(changed_frontend)
    assert changed.runtime_name != first.runtime_name
    assert changed.runtime_bytes != first.runtime_bytes


def test_offline_shell_precaches_exact_runtime_without_superseded_page_modules():
    build = build_frontend(FRONTEND)

    assert f"BASE + '{build.runtime_name}'" in build.service_worker_source
    for source in build.page_sources:
        if source == "static/background-issue-sync.js":
            continue
        assert f"BASE + '{source}'" not in build.service_worker_source


@pytest.mark.anyio
async def test_runtime_asset_is_immutable_while_html_and_worker_revalidate():
    build = build_frontend(FRONTEND)

    html = await dashboard()
    bundle = await runtime_bundle(build.runtime_digest)
    worker = await service_worker()

    assert build.runtime_name in html
    assert bundle.body == build.runtime_bytes
    assert bundle.headers["cache-control"] == "public, max-age=31536000, immutable"
    assert worker.headers["cache-control"] == "no-cache"
    assert build.runtime_name.encode() in worker.body