"""Integration tests for the `/ui` router (spec §PR 2).

Covers the full round-trip through `POST /ui/jobs` — the handler parses
multipart form data into a `RequestIX` and hands it to
`ix.store.jobs_repo.insert_pending`, the same entry point the REST adapter
uses. Tests assert the job row exists with the right client/request ids and
that custom-use-case forms produce a `use_case_inline` block in the stored
request JSON.

The DB-touching tests depend on the shared integration conftest which
spins up migrations against the configured Postgres; the pure-template
tests (`GET /ui` and the fragment renderer) still need a factory but
won't actually query — they're cheap.
"""

from __future__ import annotations

import json
from collections.abc import Iterator
from pathlib import Path
from uuid import uuid4

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import select
from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine

from ix.adapters.rest.routes import Probes, get_probes, get_session_factory_dep
from ix.app import create_app
from ix.store.models import IxJob

FIXTURE_DIR = Path(__file__).resolve().parents[1] / "fixtures"
FIXTURE_PDF = FIXTURE_DIR / "synthetic_giro.pdf"


def _factory_for_url(postgres_url: str):  # type: ignore[no-untyped-def]
    def _factory():  # type: ignore[no-untyped-def]
        eng = create_async_engine(postgres_url, pool_pre_ping=True)
        return async_sessionmaker(eng, expire_on_commit=False)

    return _factory


@pytest.fixture
def app(postgres_url: str) -> Iterator[TestClient]:
    app_obj = create_app(spawn_worker=False)
    app_obj.dependency_overrides[get_session_factory_dep] = _factory_for_url(
        postgres_url
    )
    app_obj.dependency_overrides[get_probes] = lambda: Probes(
        ollama=lambda: "ok", ocr=lambda: "ok"
    )
    with TestClient(app_obj) as client:
        yield client


class TestIndexPage:
    def test_index_returns_html(self, app: TestClient) -> None:
        resp = app.get("/ui")
        assert resp.status_code == 200
        assert "text/html" in resp.headers["content-type"]
        body = resp.text
        # Dropdown prefilled with the registered use case.
        assert "bank_statement_header" in body
        # Marker for the submission form.
        assert '<form' in body

    def test_static_mount_is_reachable(self, app: TestClient) -> None:
        # StaticFiles returns 404 for the keepfile; the mount itself must
        # exist so asset URLs resolve. We probe the directory root instead.
        resp = app.get("/ui/static/.gitkeep")
        # .gitkeep exists in the repo — expect 200 (or at minimum not a 404
        # due to missing mount). A 405/403 would also indicate the mount is
        # wired; we assert the response is *not* a 404 from a missing route.
        assert resp.status_code != 404


class TestSubmitJobRegistered:
    def test_post_registered_use_case_creates_row(
        self,
        app: TestClient,
        postgres_url: str,
    ) -> None:
        request_id = f"ui-reg-{uuid4().hex[:8]}"
        with FIXTURE_PDF.open("rb") as fh:
            resp = app.post(
                "/ui/jobs",
                data={
                    "use_case_mode": "registered",
                    "use_case_name": "bank_statement_header",
                    "ix_client_id": "ui-test",
                    "request_id": request_id,
                    "texts": "",
                    "use_ocr": "on",
                    "include_provenance": "on",
                    "max_sources_per_field": "10",
                },
                files={"pdf": ("sample.pdf", fh, "application/pdf")},
                follow_redirects=False,
            )
        assert resp.status_code in (200, 303), resp.text

        # Assert the row exists in the DB.
        job_row = _find_job(postgres_url, "ui-test", request_id)
        assert job_row is not None
        assert job_row.status == "pending"
        assert job_row.request["use_case"] == "bank_statement_header"
        # Context.files must reference a local file:// path.
        files = job_row.request["context"]["files"]
        assert len(files) == 1
        entry = files[0]
        url = entry if isinstance(entry, str) else entry["url"]
        assert url.startswith("file://")

    def test_htmx_submit_uses_hx_redirect_header(
        self,
        app: TestClient,
    ) -> None:
        request_id = f"ui-htmx-{uuid4().hex[:8]}"
        with FIXTURE_PDF.open("rb") as fh:
            resp = app.post(
                "/ui/jobs",
                data={
                    "use_case_mode": "registered",
                    "use_case_name": "bank_statement_header",
                    "ix_client_id": "ui-test",
                    "request_id": request_id,
                },
                files={"pdf": ("sample.pdf", fh, "application/pdf")},
                headers={"HX-Request": "true"},
                follow_redirects=False,
            )
        assert resp.status_code == 200
        assert "HX-Redirect" in resp.headers


class TestSubmitJobCustom:
    def test_post_custom_use_case_stores_inline(
        self,
        app: TestClient,
        postgres_url: str,
    ) -> None:
        request_id = f"ui-cust-{uuid4().hex[:8]}"
        fields_json = json.dumps(
            [
                {"name": "vendor", "type": "str", "required": True},
                {"name": "total", "type": "decimal"},
            ]
        )
        with FIXTURE_PDF.open("rb") as fh:
            resp = app.post(
                "/ui/jobs",
                data={
                    "use_case_mode": "custom",
                    "use_case_name": "invoice_adhoc",
                    "ix_client_id": "ui-test",
                    "request_id": request_id,
                    "system_prompt": "Extract vendor and total.",
                    "default_model": "qwen3:14b",
                    "fields_json": fields_json,
                },
                files={"pdf": ("sample.pdf", fh, "application/pdf")},
                follow_redirects=False,
            )
        assert resp.status_code in (200, 303), resp.text
        job_row = _find_job(postgres_url, "ui-test", request_id)
        assert job_row is not None
        stored = job_row.request["use_case_inline"]
        assert stored is not None
        assert stored["use_case_name"] == "invoice_adhoc"
        assert stored["system_prompt"] == "Extract vendor and total."
        names = [f["name"] for f in stored["fields"]]
        assert names == ["vendor", "total"]

    def test_post_malformed_fields_json_rejected(
        self,
        app: TestClient,
        postgres_url: str,
    ) -> None:
        request_id = f"ui-bad-{uuid4().hex[:8]}"
        with FIXTURE_PDF.open("rb") as fh:
            resp = app.post(
                "/ui/jobs",
                data={
                    "use_case_mode": "custom",
                    "use_case_name": "adhoc_bad",
                    "ix_client_id": "ui-test",
                    "request_id": request_id,
                    "system_prompt": "p",
                    "fields_json": "this is not json",
                },
                files={"pdf": ("sample.pdf", fh, "application/pdf")},
                follow_redirects=False,
            )
        # Either re-rendered form (422 / 200 with error) — what matters is
        # that no row was inserted.
        assert resp.status_code in (200, 400, 422)
        job_row = _find_job(postgres_url, "ui-test", request_id)
        assert job_row is None
        # A helpful error should appear somewhere in the body.
        assert (
            "error" in resp.text.lower()
            or "invalid" in resp.text.lower()
            or "json" in resp.text.lower()
        )


class TestFragment:
    def test_fragment_pending_has_trigger(
        self,
        app: TestClient,
        postgres_url: str,
    ) -> None:
        request_id = f"ui-frag-p-{uuid4().hex[:8]}"
        with FIXTURE_PDF.open("rb") as fh:
            app.post(
                "/ui/jobs",
                data={
                    "use_case_mode": "registered",
                    "use_case_name": "bank_statement_header",
                    "ix_client_id": "ui-test",
                    "request_id": request_id,
                },
                files={"pdf": ("sample.pdf", fh, "application/pdf")},
                follow_redirects=False,
            )
        job_row = _find_job(postgres_url, "ui-test", request_id)
        assert job_row is not None

        resp = app.get(f"/ui/jobs/{job_row.job_id}/fragment")
        assert resp.status_code == 200
        body = resp.text
        # Pending → auto-refresh every 2s.
        assert "hx-trigger" in body
        assert "2s" in body
        assert "pending" in body.lower() or "running" in body.lower()

    def test_fragment_done_shows_pretty_json(
        self,
        app: TestClient,
        postgres_url: str,
    ) -> None:
        request_id = f"ui-frag-d-{uuid4().hex[:8]}"
        with FIXTURE_PDF.open("rb") as fh:
            app.post(
                "/ui/jobs",
                data={
                    "use_case_mode": "registered",
                    "use_case_name": "bank_statement_header",
                    "ix_client_id": "ui-test",
                    "request_id": request_id,
                },
                files={"pdf": ("sample.pdf", fh, "application/pdf")},
                follow_redirects=False,
            )
        job_row = _find_job(postgres_url, "ui-test", request_id)
        assert job_row is not None

        # Hand-tick the row to done with a fake response.
        _force_done(
            postgres_url,
            job_row.job_id,
            response_body={
                "use_case": "bank_statement_header",
                "ix_result": {"result": {"bank_name": "UBS AG", "currency": "CHF"}},
            },
        )

        resp = app.get(f"/ui/jobs/{job_row.job_id}/fragment")
        assert resp.status_code == 200
        body = resp.text
        # Terminal → no auto-refresh.
        assert "every 2s" not in body and "every  2s" not in body
        # JSON present.
        assert "UBS AG" in body
        assert "CHF" in body


def _find_job(postgres_url: str, client_id: str, request_id: str):  # type: ignore[no-untyped-def]
    """Look up an ``ix_jobs`` row via the async engine, wrapping the coroutine
    for test convenience."""

    import asyncio
    import json as _json

    async def _go():  # type: ignore[no-untyped-def]
        eng = create_async_engine(postgres_url)
        sf = async_sessionmaker(eng, expire_on_commit=False)
        try:
            async with sf() as session:
                r = await session.scalar(
                    select(IxJob).where(
                        IxJob.client_id == client_id,
                        IxJob.request_id == request_id,
                    )
                )
                if r is None:
                    return None

                class _JobRow:
                    pass

                out = _JobRow()
                out.job_id = r.job_id
                out.client_id = r.client_id
                out.request_id = r.request_id
                out.status = r.status
                if isinstance(r.request, str):
                    out.request = _json.loads(r.request)
                else:
                    out.request = r.request
                return out
        finally:
            await eng.dispose()

    return asyncio.run(_go())


def _force_done(
    postgres_url: str,
    job_id,  # type: ignore[no-untyped-def]
    response_body: dict,
) -> None:
    """Flip a pending job to ``done`` with the given response payload."""

    import asyncio
    from datetime import UTC, datetime

    from sqlalchemy import text

    async def _go():  # type: ignore[no-untyped-def]
        eng = create_async_engine(postgres_url)
        try:
            async with eng.begin() as conn:
                await conn.execute(
                    text(
                        "UPDATE ix_jobs SET status='done', "
                        "response=CAST(:resp AS JSONB), finished_at=:now "
                        "WHERE job_id=:jid"
                    ),
                    {
                        "resp": json.dumps(response_body),
                        "now": datetime.now(UTC),
                        "jid": str(job_id),
                    },
                )
        finally:
            await eng.dispose()

    asyncio.run(_go())