"""Job registry behavior: registration shape and the 50-entry eviction cap.

Unit-level tests against app._register_job — the registry is module-global
state that every API test isolates via the autouse fixture.
"""
import time

import app


def test_register_job_shape():
    job_id = app._register_job("x.epub")
    assert job_id in app.JOBS
    job = app.JOBS[job_id]
    assert job["id"] == job_id
    assert job["epub"] == "x.epub"
    assert job["status"] == "queued"
    assert job["progress"] == 0.0
    assert job["message"] == "queued"
    assert job["filename"] is None
    assert job["error"] is None
    assert job["created"] > 0


def test_job_ids_are_unique():
    a = app._register_job("a.epub")
    b = app._register_job("b.epub")
    assert a != b


def test_registry_evicts_oldest_beyond_50():
    now = time.time()
    old_ids = []
    for i in range(50):
        jid = app._register_job(f"old{i}.epub")
        old_ids.append(jid)
        # Force ascending 'created' so eviction order is deterministic.
        app.JOBS[jid]["created"] = now - (1000 - i)
    oldest = old_ids[0]
    newest_old = old_ids[-1]

    new_id = app._register_job("new.epub")

    assert len(app.JOBS) == 50
    assert oldest not in app.JOBS, "oldest job must be evicted"
    assert newest_old in app.JOBS
    assert new_id in app.JOBS