"""Tests for progress event emission and the SSE/job endpoints."""
from __future__ import annotations

import json
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from app.jobs import Job, JobResult, JobRegistry
from app.main import app


REPO_ROOT = Path(__file__).resolve().parents[1]
VIDEO = REPO_ROOT / "smaller.m4v"
TRANSCRIPT = REPO_ROOT / "M14_L3_S3.srt"

requires_media = pytest.mark.skipif(
    not (VIDEO.exists() and TRANSCRIPT.exists()),
    reason="sample media not present",
)


def test_run_pipeline_emits_progress_events_in_order(tmp_path):
    """The orchestrator should emit progress events covering each stage."""
    pytest.importorskip("cv2")
    from app.pipeline.orchestrator import (
        PipelineInputs,
        ProgressEvent,
        run_pipeline,
        PipelineError,
    )

    if not VIDEO.exists() or not TRANSCRIPT.exists():
        pytest.skip("media not present")

    events: list[ProgressEvent] = []
    inputs = PipelineInputs(
        video_path=VIDEO,
        transcript_path=TRANSCRIPT,
        frames_dir=tmp_path / "static",
        title="Progress Test",
        max_frames=2,
        skip_ocr=True,
    )
    try:
        run_pipeline(inputs, progress=events.append)
    except PipelineError:
        pytest.skip("pipeline could not produce segments on this clip")

    # Must start before 100% and end at 100% with stage 'done'.
    assert events, "no progress events"
    assert events[0].percent < 100
    assert events[-1].stage == "done"
    assert events[-1].percent == 100

    # Percent should be monotonically non-decreasing.
    pcts = [e.percent for e in events]
    assert pcts == sorted(pcts), f"percents not monotonically increasing: {pcts}"

    # Each expected stage shows up at least once.
    stages = {e.stage for e in events}
    assert {"scene_detect", "filter", "transcript", "ocr", "render", "done"} <= stages


@requires_media
def test_jobs_endpoint_accepts_blank_max_frames(tmp_path):
    """Regression: an empty max_frames input must not 422 on int coercion."""
    client = TestClient(app)
    with VIDEO.open("rb") as v, TRANSCRIPT.open("rb") as t:
        resp = client.post(
            "/jobs",
            data={
                "title": "Blank Max",
                "format": "single",
                "max_frames": "",  # the bug: form sent "" when user left it blank
                "skip_ocr": "true",
            },
            files={
                "video": (VIDEO.name, v, "video/mp4"),
                "transcript": (TRANSCRIPT.name, t, "application/x-subrip"),
            },
        )
    assert resp.status_code == 202, resp.text


def test_jobs_endpoint_rejects_unknown_video_type(tmp_path):
    client = TestClient(app)
    bogus = tmp_path / "fake.txt"
    bogus.write_text("not a video")
    srt = tmp_path / "t.srt"
    srt.write_text("1\n00:00:00,000 --> 00:00:01,000\nhello\n")
    with bogus.open("rb") as v, srt.open("rb") as t:
        resp = client.post(
            "/jobs",
            data={"title": "x"},
            files={
                "video": ("fake.txt", v, "text/plain"),
                "transcript": ("t.srt", t, "application/x-subrip"),
            },
        )
    assert resp.status_code == 400


def test_jobs_endpoint_rejects_unknown_format(tmp_path):
    client = TestClient(app)
    mp4 = tmp_path / "x.mp4"
    mp4.write_bytes(b"fake")
    srt = tmp_path / "t.srt"
    srt.write_text("1\n00:00:00,000 --> 00:00:01,000\nhello\n")
    with mp4.open("rb") as v, srt.open("rb") as t:
        resp = client.post(
            "/jobs",
            data={"title": "x", "format": "evil-format"},
            files={
                "video": ("x.mp4", v, "video/mp4"),
                "transcript": ("t.srt", t, "application/x-subrip"),
            },
        )
    assert resp.status_code == 400
    assert "format" in resp.text.lower()


def test_jobs_endpoint_cleans_workdir_on_save_failure(tmp_path):
    # Triggering a 400 after the workdir is mkdtemp'd: a malformed
    # max_frames raises during _parse_optional_int. The handler's
    # try/except must remove the freshly-created vgm_ directory.
    import glob
    import os
    import tempfile as _t
    client = TestClient(app)
    before = set(glob.glob(os.path.join(_t.gettempdir(), "vgm_*")))
    mp4 = tmp_path / "x.mp4"
    mp4.write_bytes(b"fake")
    srt = tmp_path / "t.srt"
    srt.write_text("1\n00:00:00,000 --> 00:00:01,000\nhello\n")
    with mp4.open("rb") as v, srt.open("rb") as t:
        resp = client.post(
            "/jobs",
            data={"title": "x", "max_frames": "not-an-int"},
            files={
                "video": ("x.mp4", v, "video/mp4"),
                "transcript": ("t.srt", t, "application/x-subrip"),
            },
        )
    assert resp.status_code == 400
    after = set(glob.glob(os.path.join(_t.gettempdir(), "vgm_*")))
    assert after - before == set(), f"leaked workdir(s): {after - before}"


def test_events_endpoint_404_for_unknown_job():
    client = TestClient(app)
    resp = client.get("/events/no-such-id", headers={"Accept": "text/event-stream"})
    assert resp.status_code == 404


def test_result_endpoint_404_for_unknown_job():
    client = TestClient(app)
    resp = client.get("/result/no-such-id")
    assert resp.status_code == 404


def test_result_endpoint_review_html_survives_repeat_get():
    """Review-mode results have no attachment filename; the upload page
    loads them into an iframe AND lets the user "Open in new tab",
    which re-fetches the same URL. The body must remain readable for
    the job's TTL — not be cleared after the first GET.
    """
    from app.main import registry

    job = registry.create()
    try:
        registry.finish_success(
            job,
            JobResult(body=b"<html>review</html>", media_type="text/html; charset=utf-8"),
        )
        client = TestClient(app)
        first = client.get(f"/result/{job.id}")
        assert first.status_code == 200
        assert first.content == b"<html>review</html>"
        second = client.get(f"/result/{job.id}")
        assert second.status_code == 200, second.text
        assert second.content == b"<html>review</html>"
    finally:
        registry.pop(job.id)


def test_result_endpoint_attachment_download_is_one_shot():
    """Single/zip results are MB-scale attachment downloads that the
    browser fetches once. Keep the existing free-after-deliver behavior
    so we don't pin those bytes in memory for the full TTL.
    """
    from app.main import registry

    job = registry.create()
    try:
        registry.finish_success(
            job,
            JobResult(
                body=b"PK\x03\x04zipbytes",
                media_type="application/zip",
                filename="guide.zip",
            ),
        )
        client = TestClient(app)
        first = client.get(f"/result/{job.id}")
        assert first.status_code == 200
        assert first.content == b"PK\x03\x04zipbytes"
        second = client.get(f"/result/{job.id}")
        assert second.status_code == 410
    finally:
        registry.pop(job.id)


def test_job_registry_emit_and_finish():
    reg = JobRegistry()
    job = reg.create()
    reg.emit(job, type="progress", percent=10, stage="scene_detect", message="Detecting scenes...")
    reg.emit(job, type="progress", percent=50, stage="ocr", message="OCR 1/2")
    reg.finish_success(job, JobResult(body=b"<html></html>", media_type="text/html"))

    seen: list[dict] = []
    while True:
        try:
            seen.append(job.events.get_nowait())
        except Exception:
            break

    assert seen[0]["type"] == "progress"
    assert seen[0]["stage"] == "scene_detect"
    assert seen[-1]["type"] == "done"
    assert job.status == "done"
    assert job.result.media_type == "text/html"


@requires_media
def test_full_sse_job_lifecycle(tmp_path):
    """End-to-end: POST /jobs, stream events, fetch result."""
    client = TestClient(app)
    with VIDEO.open("rb") as v, TRANSCRIPT.open("rb") as t:
        resp = client.post(
            "/jobs",
            data={
                "title": "SSE Test",
                "format": "single",
                "skip_ocr": "true",
                "max_frames": "2",
            },
            files={
                "video": (VIDEO.name, v, "video/mp4"),
                "transcript": (TRANSCRIPT.name, t, "application/x-subrip"),
            },
        )
    assert resp.status_code == 202, resp.text
    payload = resp.json()
    job_id = payload["job_id"]
    events_url = payload["events_url"]
    result_url = payload["result_url"]

    # Stream events synchronously; collect until 'done' or 'error'.
    events: list[dict] = []
    with client.stream("GET", events_url) as es:
        for raw in es.iter_lines():
            if not raw or not raw.startswith("data: "):
                continue
            data = json.loads(raw[len("data: "):])
            events.append(data)
            if data.get("type") in ("done", "error"):
                break

    assert events[-1]["type"] == "done", events[-1]
    # We should have seen at least one progress event before done.
    assert any(e["type"] == "progress" for e in events)

    # Pick up the result.
    resp = client.get(result_url)
    assert resp.status_code == 200
    assert resp.headers["content-type"].startswith("text/html")
    assert b"<title>SSE Test</title>" in resp.content


def test_review_readstate_serializes_audio_filename():
    """The review-mode editor's readState() builds the JSON the ZIP
    endpoint renders from. The audio element carries data-audio-filename,
    but if readState() doesn't pick it up, page.segments[*].audio_filename
    is empty and the bundled ZIP silently drops all per-segment audio
    even though the job has the bytes in memory.
    """
    review_template = REPO_ROOT / "app" / "templates" / "review.html"
    src = review_template.read_text()
    # The audio element exposes the filename to the editor.
    assert 'data-audio-filename="{{ seg.audio_filename }}"' in src
    # readState() must read it…
    assert "data-audio-filename" in src.split("function readState")[1].split("function ")[0]
    # …and emit it on the per-segment object so PageMetadata.segments[*]
    # carries audio_filename through to the ZIP renderer.
    readstate_body = src.split("function readState")[1].split("function ")[0]
    assert "audio_filename:" in readstate_body


def test_zip_endpoint_rejects_path_traversal_filenames(tmp_path):
    """A crafted state.segments[*].{image,audio}_filename must not pull
    arbitrary readable files into the bundle. The endpoint should drop
    any filename that doesn't match the pipeline's own naming patterns
    so `frames_dir / filename` can never resolve outside the temp dir.
    """
    import io
    import zipfile

    from app.main import registry

    # Plant a sentinel file outside the temp `static/` workdir that a
    # traversal payload would otherwise read.
    secret = tmp_path / "outside_secret.txt"
    secret.write_text("sentinel-secret-bytes")

    job = registry.create()
    try:
        client = TestClient(app)
        # No `primary_image_data_uris` entries are written for these
        # bogus filenames (they fail the upload-time regex), so the only
        # way the bundler could include them is via the unvalidated
        # `frames_dir / s.image_filename` join.
        # Two `..` segments to climb out of both `static/` and the
        # `vgm_zip_*` workdir mkdtemp picks under TMPDIR.
        traversal_image = f"../../{secret.name}"
        traversal_audio = f"../../{secret.name}"
        body = {
            "state": {
                "title": "Traversal Test",
                "frames_dir": "static",
                "segments": [
                    {
                        "index": 0,
                        "start_seconds": 0.0,
                        "end_seconds": 1.0,
                        "image_filename": traversal_image,
                        "section_title": "S",
                        "alt_text": "",
                        "audio_filename": traversal_audio,
                    }
                ],
            },
            "primary_image_data_uris": {},
        }

        # We need `frames_dir` in the handler to live under `tmp_path`
        # so the `..` payload would actually resolve to our sentinel.
        # The handler uses `tempfile.mkdtemp(prefix="vgm_zip_")`, which
        # honors $TMPDIR — point it at tmp_path for this test.
        import os
        old_tmpdir = os.environ.get("TMPDIR")
        os.environ["TMPDIR"] = str(tmp_path)
        try:
            import tempfile as _tempfile
            _tempfile.tempdir = str(tmp_path)
            resp = client.post(f"/jobs/{job.id}/zip", json=body)
        finally:
            _tempfile.tempdir = None
            if old_tmpdir is None:
                os.environ.pop("TMPDIR", None)
            else:
                os.environ["TMPDIR"] = old_tmpdir

        assert resp.status_code == 200, resp.text
        with zipfile.ZipFile(io.BytesIO(resp.content)) as zf:
            names = zf.namelist()
        # The sentinel file's basename must not appear anywhere in the bundle.
        assert not any(secret.name in n for n in names), names
    finally:
        registry.pop(job.id)