"""End-to-end conversion through the HTTP API (Flask test client).

Covers: upload -> 202 job_id -> poll -> done -> download valid PDF.
"""
import io

import app
from tests.helpers import download_bytes, wait_for_job


def test_convert_happy_path_end_to_end(client, submit_epub):
    resp = submit_epub(filename="book.epub")
    assert resp.status_code == 202, resp.get_json()
    job_id = resp.get_json()["job_id"]
    assert isinstance(job_id, str) and job_id

    job = wait_for_job(client, job_id)
    assert job["status"] == "done", job
    assert job["progress"] == 100
    assert job["filename"].endswith(".pdf")
    assert job["epub"] == "book.epub"
    assert job["error"] is None

    data = download_bytes(client, job["filename"])
    assert data[:4] == b"%PDF", "downloaded body is not a PDF"


def test_convert_records_intermediate_working_state(client, submit_epub):
    """A fresh job must be visible as queued/working before it finishes."""
    job_id = submit_epub().get_json()["job_id"]
    snap = client.get(f"/api/jobs/{job_id}").get_json()
    # The worker thread starts asynchronously; allow queued or working.
    assert snap["status"] in ("queued", "working")
    assert snap["progress"] >= 0.0


def test_convert_uppercase_extension_is_accepted(client, submit_epub):
    """Extension check is case-insensitive (.EPUB must not be rejected)."""
    resp = submit_epub(filename="BOOK.EPUB")
    assert resp.status_code == 202
    job = wait_for_job(client, resp.get_json()["job_id"])
    assert job["status"] == "done", job


def test_convert_output_file_written_to_output_dir(client, submit_epub):
    job_id = submit_epub().get_json()["job_id"]
    job = wait_for_job(client, job_id)
    out = app.OUTPUT_DIR / job["filename"]
    assert out.is_file()
    assert out.stat().st_size > 1024


def test_convert_no_file_field_returns_400(client):
    resp = client.post("/api/convert", content_type="multipart/form-data")
    assert resp.status_code == 400
    assert "No file" in resp.get_json()["error"]