"""plausible — Phase-2 §4.3 recipe-specific functional tests (event tracking).

plausible's *raison d'être* is ingesting analytics events and storing them in ClickHouse. These two
tests prove the full create-and-read-back path end to end — they are NOT health/200 stand-ins:

  * test_pageview_event_roundtrip  — POST a `pageview` to the public /api/event ingestion endpoint,
    then read the row back out of the ClickHouse `events_v2` table (the primary object: a tracked
    event). §4.3 "track a test event, query it back".
  * test_custom_event_roundtrip    — POST a *custom-named* event (a goal/conversion, plausible's
    distinctive non-pageview tracking path) and confirm it lands under that name. Exercises a
    characteristic feature beyond the basic pageview.

Both assert real app state (the event reached the analytics store), not just the HTTP 202 ack.

plausible only ingests events for *known* sites — the in-memory `sites_cache` gates ingestion and
drops events for unregistered domains (empirically confirmed: an event for an unregistered domain
never appears in events_v2). So each test first registers a site row in the metadata postgres, then
POSTs repeatedly while polling ClickHouse: the sites_cache must refresh to admit the new site and the
event write-buffer must flush to ClickHouse, so the first landing is not instantaneous. Re-POSTing the
same event is safe — we assert the row count is >= 1.

No recipe-maintainer corpus exists for plausible (recipe-info/plausible/ has no tests/), so these are
net-new recipe-specific tests rather than parity ports — see tests/plausible/PARITY.md.
"""

from __future__ import annotations

import os
import sys
import time

sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "..", "runner"))
from harness import http as harness_http  # noqa: E402
from harness import lifecycle  # noqa: E402

# A real browser User-Agent — plausible's ingestion drops requests from bot/library UAs (e.g. the
# default python-urllib UA), so the event would silently never reach ClickHouse without this.
_UA = (
    "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 "
    "(KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
)


def _ch(domain: str, sql: str) -> str:
    """Run a ClickHouse query against the `plausible_events_db` service; return stdout (stripped)."""
    return lifecycle.exec_in_app(
        domain,
        ["clickhouse-client", "--database", "plausible_events_db", "--query", sql],
        service="plausible_events_db",
    ).strip()


def _register_site(domain: str, site: str) -> None:
    """Insert a site row into the metadata postgres (`db` service) so plausible will ingest events for
    it. Idempotent (ON CONFLICT DO NOTHING)."""
    sql = (
        "INSERT INTO sites (domain, timezone, inserted_at, updated_at, native_stats_start_at) "
        f"VALUES ('{site}','UTC', now(), now(), now()) ON CONFLICT (domain) DO NOTHING; "
        f"SELECT domain FROM sites WHERE domain = '{site}';"
    )
    out = lifecycle.exec_in_app(
        domain, ["psql", "-q", "-U", "plausible", "-d", "plausible", "-tAc", sql], service="db"
    ).strip()
    assert out == site, f"site {site!r} not registered in postgres (got {out!r})"


def _post_event(base_domain: str, site: str, name: str, pathname: str) -> int:
    """POST one event to the public ingestion endpoint; return the HTTP status (plausible acks 202)."""
    status, _ = harness_http.http_post(
        f"https://{base_domain}/api/event",
        data={"name": name, "url": f"https://{site}{pathname}", "domain": site},
        headers={"User-Agent": _UA, "X-Forwarded-For": "203.0.113.9"},
        timeout=15,
    )
    return status


def _ingest_and_count(
    base_domain: str,
    site: str,
    name: str,
    pathname: str,
    max_wait: int = 210,
    interval: int = 10,
) -> int:
    """Register the site, then POST the event on a poll loop until its row appears in ClickHouse.

    Returns the events_v2 row count for (pathname, name). Raises if nothing lands within max_wait —
    a genuinely-broken ingestion path therefore FAILS (this is not a vacuous check)."""
    _register_site(base_domain, site)
    count_sql = f"SELECT count() FROM events_v2 WHERE pathname = '{pathname}' AND name = '{name}'"
    deadline = time.time() + max_wait
    last_status = None
    while True:
        last_status = _post_event(base_domain, site, name, pathname)
        assert (
            last_status == 202
        ), f"POST /api/event for {name!r} → HTTP {last_status} (expected 202)"
        time.sleep(interval)
        raw = _ch(base_domain, count_sql)
        count = int(raw) if raw.isdigit() else 0
        if count >= 1:
            return count
        if time.time() >= deadline:
            raise AssertionError(
                f"event name={name!r} pathname={pathname!r} for site={site!r} never reached "
                f"ClickHouse events_v2 within {max_wait}s (last POST status={last_status}, "
                f"last count={count})"
            )


def test_pageview_event_roundtrip(live_app):
    """Track a pageview event via /api/event, read it back from ClickHouse (§4.3 primary object)."""
    site = "ccci-pageview.example"
    pathname = "/ccci-pageview-roundtrip"
    count = _ingest_and_count(live_app, site, "pageview", pathname)
    assert count >= 1, f"expected >=1 pageview row, got {count}"

    # Read-back: confirm the stored row carries the data we sent (real app state, not just a count).
    row = _ch(
        live_app,
        f"SELECT name, pathname, hostname FROM events_v2 "
        f"WHERE pathname = '{pathname}' AND name = 'pageview' LIMIT 1 FORMAT TabSeparated",
    )
    name, stored_path, hostname = (row.split("\t") + ["", "", ""])[:3]
    assert name == "pageview", f"stored event name {name!r} != 'pageview'"
    assert stored_path == pathname, f"stored pathname {stored_path!r} != {pathname!r}"
    assert hostname == site, f"stored hostname {hostname!r} != site {site!r}"


def test_custom_event_roundtrip(live_app):
    """Track a custom-named event (a goal/conversion — plausible's distinctive non-pageview path) and
    confirm it lands under that exact name in ClickHouse, distinct from the pageview path."""
    site = "ccci-goal.example"
    pathname = "/ccci-custom-event"
    event_name = "ccci-Signup"
    count = _ingest_and_count(live_app, site, event_name, pathname)
    assert count >= 1, f"expected >=1 custom-event row, got {count}"

    # The row must be stored under the custom name (not coerced to 'pageview') — proves the
    # custom-event/goal ingestion path works.
    stored_name = _ch(
        live_app,
        f"SELECT name FROM events_v2 WHERE pathname = '{pathname}' LIMIT 1",
    )
    assert (
        stored_name == event_name
    ), f"custom event stored as {stored_name!r}, expected {event_name!r}"