"""US09-04: the user manual's screenshots, produced from the running application.

A screenshot nobody can regenerate is a screenshot that silently stops being true.
So every image in the manual is captured here, from a real server and a real worker
driving a temporary fixture library, and never pasted in by hand.

Regenerate the committed images with one command:

    PHOTO_PIPELINE_WRITE_SCREENSHOTS=1 work_item/scripts/python -m pytest \
        tests/e2e/test_user_manual_screenshots.py -q

Without that variable the capture still runs on every suite — the generator has to
keep working, and a view that stops rendering must fail here rather than in a
reader's browser — but the images go to a temporary directory. Regenerating on every
run would leave the working tree permanently dirty, because PNG output is not
byte-stable.
"""

from __future__ import annotations

import os
import re
from contextlib import closing
from pathlib import Path

import pytest

from tests.conftest import session_client
from tests.e2e._pipeline_harness import (
    Server,
    seed_album,
    start_worker,
    wait_until,
)

REPO = Path(__file__).resolve().parents[2]
DOCS = REPO / "docs"
IMAGES = DOCS / "images"
ALBUM = "rome"
VIEWPORT = {"width": 1280, "height": 900}

# One per stage page of the manual: the route to visit, and the element whose
# presence means the view has actually finished rendering.
SHOTS = (
    ("workflow", "#/workflow", "stage-safety"),
    ("inventory", "#/inventory", "asset-row"),
    ("duplicates", "#/duplicates", None),
    ("safety", "#/safety", None),
    ("analysis", "#/analyze", "analyze-counts"),
    ("albums", f"#/albums?album={ALBUM}", "suggested-name"),
    ("renames", "#/renames", None),
    ("uploads", "#/uploads", "upload-scope"),
    ("archive", "#/archive", "archive-locations"),
    ("statistics", "#/stats", None),
)


def writing() -> bool:
    return os.environ.get("PHOTO_PIPELINE_WRITE_SCREENSHOTS") == "1"


@pytest.fixture(scope="module")
def stack(tmp_path_factory):
    """A library in the state the manual describes: one analysed album, a duplicate
    to review, an archive destination, and a worker that claims jobs."""
    tmp_path = tmp_path_factory.mktemp("manual")
    seeded = seed_album(tmp_path, ALBUM, ("forum.jpg", "colosseum.jpg"))
    worker = start_worker(seeded, fake_vision_log=tmp_path / "vision.log")
    server = Server(seeded).start()
    try:
        _prepare(server.base, seeded)
        yield server
    finally:
        server.stop()
        worker.terminate()
        worker.wait(timeout=10)


def _prepare(base: str, seeded) -> None:
    """Everything the views need, established over the public API — the same calls a
    person would make, so the screenshots show reachable states."""
    with closing(session_client(base, timeout=30)) as client:
        client.post("/api/v1/duplicates/detect").raise_for_status()
        client.post("/api/v1/albums/proposals", json={}).raise_for_status()
        destination = seeded.data / "archive"
        destination.mkdir(exist_ok=True)
        client.post(
            "/api/v1/archive-locations",
            json={"name": "external disk", "root": str(destination)},
        ).raise_for_status()
        wait_until(lambda: client.get("/api/v1/workflow").status_code == 200)


def _capture(page, server, target: Path) -> list[str]:
    target.mkdir(parents=True, exist_ok=True)
    page.set_viewport_size(VIEWPORT)
    written = []
    for name, route, ready in SHOTS:
        page.goto(f"{server.base}/app/{route}")
        if ready:
            page.get_by_test_id(ready).first.wait_for(timeout=30_000)
        else:
            page.locator("main h1").first.wait_for(timeout=30_000)
        page.screenshot(path=str(target / f"{name}.png"))
        written.append(name)
    return written


def test_the_generator_produces_every_screenshot_the_manual_references(page, stack, tmp_path):
    destination = IMAGES if writing() else tmp_path / "images"
    written = _capture(page, stack, destination)

    assert sorted(written) == sorted(name for name, _, _ in SHOTS)
    for name in written:
        produced = destination / f"{name}.png"
        assert produced.stat().st_size > 5_000, f"{name}.png is too small to be a view"

    referenced = set(re.findall(r"images/([a-z-]+)\.png", "\n".join(
        path.read_text() for path in DOCS.rglob("*.md")
    )))
    assert referenced <= set(written), f"the manual references images nobody generates: {referenced - set(written)}"


def test_no_screenshot_shows_a_real_path_or_a_secret(page, stack, tmp_path):
    """The fixture library is synthetic and lives in a temporary directory, so the
    pixels cannot carry someone's photographs — but the view can still print a path,
    and that path must be the fixture's, never the operator's."""
    with closing(session_client(stack.base, timeout=30)) as client:
        rendered = client.get("/api/v1/inventory/assets", params={"limit": 200}).json()["items"]
    paths = [item["current_path"] for item in rendered if item["current_path"]]
    assert paths, "nothing was rendered, so nothing was proven"
    assert all("/manual" in path or "pytest" in path or "/tmp" in path or "/var" in path for path in paths), paths
    assert all(ALBUM in path or "images" in path for path in paths)


def test_every_committed_screenshot_is_referenced_by_a_page():
    """An image nobody shows is an image nobody updates."""
    if not IMAGES.is_dir():
        pytest.skip("no screenshots have been generated into the repository yet")
    text = "\n".join(path.read_text() for path in DOCS.rglob("*.md"))
    orphans = sorted(
        image.name for image in IMAGES.glob("*.png") if f"images/{image.name}" not in text
    )
    assert orphans == [], f"committed but unreferenced: {orphans}"