"""End-to-end HTTP tests for the Phase 4 admin CMS.

Exercises the real :class:`FastAPI` app constructed by
:func:`app.main.create_app` against a temp-file SQLite database plus
a temp media directory. Uses the email-capture trick from
``tests/test_admin_routes.py`` to complete the magic-link login so we
have a real authenticated session + CSRF cookie.
"""

from __future__ import annotations

import importlib
import io
import re
from pathlib import Path
from typing import Iterator

import pytest
from fastapi.testclient import TestClient
from PIL import Image
from sqlalchemy import text


_CSRF_META_RE = re.compile(
    r'<meta name="csrf-token" content="([^"]*)"'
)


@pytest.fixture
def cms_app(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> Iterator[tuple[TestClient, dict, Path]]:
    """Build a fresh authed app + temp media dir + captured email URL."""
    media_root = tmp_path / "media"
    media_root.mkdir()

    monkeypatch.setenv("DATABASE_URL", f"sqlite:///{tmp_path}/cms.db")
    monkeypatch.setenv("ADMIN_EMAILS", "headhen@example.com")
    monkeypatch.setenv("APP_ENV", "development")
    monkeypatch.setenv(
        "SECRET_KEY", "test-only-secret-key-0123456789abcdef-XYZ"
    )
    monkeypatch.setenv("RESEND_API_KEY", "")
    monkeypatch.setenv("PUBLIC_BASE_URL", "http://testserver")
    monkeypatch.setenv("MEDIA_ROOT", str(media_root))

    from app import config as _config

    _config.get_settings.cache_clear()

    import app.main as main_module

    importlib.reload(main_module)
    app = main_module.app

    captured: dict[str, str] = {}

    def _capture(**kw):
        captured["url"] = kw["url"]
        captured["to"] = kw["to"]

    app.state.email_service.send_magic_link = _capture  # type: ignore[assignment]

    from app.services.rate_limit import limiter

    limiter.reset()

    with TestClient(app) as client:
        yield client, captured, media_root

    _config.get_settings.cache_clear()


def _login(client: TestClient, captured: dict) -> None:
    """Walk the magic-link flow so subsequent requests are authed."""
    client.post("/admin/login", data={"email": "headhen@example.com"})
    assert "url" in captured
    consume_path = captured["url"].replace("http://testserver", "")
    resp = client.get(consume_path, follow_redirects=False)
    assert resp.status_code == 303


def _dashboard_csrf(client: TestClient) -> str:
    """GET /admin and extract the csrf-token meta tag."""
    resp = client.get("/admin")
    assert resp.status_code == 200
    match = _CSRF_META_RE.search(resp.text)
    assert match, "csrf-token meta tag missing"
    return match.group(1)


# ---------------------------------------------------------------------------
# unauthed
# ---------------------------------------------------------------------------
def test_dashboard_redirects_unauthed_to_login(cms_app) -> None:
    """An unauthenticated GET /admin yields 303 to /admin/login."""
    client, _, _ = cms_app
    resp = client.get("/admin", follow_redirects=False)
    assert resp.status_code == 303
    assert resp.headers["location"] == "/admin/login"


def test_post_create_without_auth_is_redirected(cms_app) -> None:
    """Create POST is gated behind require_admin."""
    client, _, _ = cms_app
    resp = client.post(
        "/admin/posts",
        data={"title": "x", "body_md": "y", "status": "draft", "csrf_token": ""},
        follow_redirects=False,
    )
    # Unauthenticated -> require_admin raises 303.
    assert resp.status_code == 303


# ---------------------------------------------------------------------------
# dashboard
# ---------------------------------------------------------------------------
def test_dashboard_renders_with_seeded_post(cms_app) -> None:
    """The seeded welcome post shows up in the admin table."""
    client, captured, _ = cms_app
    _login(client, captured)

    resp = client.get("/admin")
    assert resp.status_code == 200
    assert "Dashboard" in resp.text
    assert "Welcome to the Farm" in resp.text
    assert "New post" in resp.text
    assert "Edit About" in resp.text


# ---------------------------------------------------------------------------
# create + edit + delete
# ---------------------------------------------------------------------------
def test_create_post_happy_path(cms_app) -> None:
    """POST /admin/posts with CSRF creates a row and 303s to the dashboard."""
    client, captured, _ = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)

    resp = client.post(
        "/admin/posts",
        data={
            "title": "First Admin Post",
            "body_md": "Hello **world**.",
            "status": "draft",
            "csrf_token": csrf,
        },
        follow_redirects=False,
    )
    assert resp.status_code == 303
    assert resp.headers["location"].startswith("/admin?msg=created")

    # The new post is visible on the dashboard.
    dash = client.get("/admin")
    assert "First Admin Post" in dash.text


def test_create_post_without_csrf_is_forbidden(cms_app) -> None:
    """Missing csrf_token on create returns 403."""
    client, captured, _ = cms_app
    _login(client, captured)
    # Touch /admin to materialize the cb_csrf cookie.
    client.get("/admin")

    resp = client.post(
        "/admin/posts",
        data={
            "title": "Sneaky",
            "body_md": "x",
            "status": "draft",
            "csrf_token": "",  # wrong
        },
        follow_redirects=False,
    )
    assert resp.status_code == 403


def test_update_and_publish_and_delete(cms_app) -> None:
    """Full CRUD + publish toggle + delete cycle."""
    client, captured, _ = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)

    # create
    client.post(
        "/admin/posts",
        data={
            "title": "Toggle Target",
            "body_md": "body-v1",
            "status": "draft",
            "csrf_token": csrf,
        },
    )
    # look up the post id via the engine
    with client.app.state.engine.connect() as conn:
        row = conn.execute(
            text("SELECT id FROM posts WHERE title = :t"),
            {"t": "Toggle Target"},
        ).mappings().first()
    assert row is not None
    post_id = int(row["id"])

    # edit form renders
    edit_resp = client.get(f"/admin/posts/{post_id}/edit")
    assert edit_resp.status_code == 200
    assert "Toggle Target" in edit_resp.text
    # CSRF for subsequent POSTs should come off the edit page.
    match = _CSRF_META_RE.search(edit_resp.text)
    assert match
    csrf = match.group(1)

    # update
    upd = client.post(
        f"/admin/posts/{post_id}",
        data={
            "title": "Toggle Target Edited",
            "body_md": "body-v2",
            "csrf_token": csrf,
        },
        follow_redirects=False,
    )
    assert upd.status_code == 303

    # publish
    pub = client.post(
        f"/admin/posts/{post_id}/publish",
        data={"csrf_token": csrf},
        follow_redirects=False,
    )
    assert pub.status_code == 303
    assert pub.headers["location"] == "/admin?msg=published"

    # unpublish
    unpub = client.post(
        f"/admin/posts/{post_id}/publish",
        data={"csrf_token": csrf},
        follow_redirects=False,
    )
    assert unpub.status_code == 303
    assert unpub.headers["location"] == "/admin?msg=unpublished"

    # delete
    delete = client.post(
        f"/admin/posts/{post_id}/delete",
        data={"csrf_token": csrf},
        follow_redirects=False,
    )
    assert delete.status_code == 303
    assert delete.headers["location"] == "/admin?msg=deleted"

    # row is gone
    with client.app.state.engine.connect() as conn:
        gone = conn.execute(
            text("SELECT id FROM posts WHERE id = :i"),
            {"i": post_id},
        ).first()
    assert gone is None


def test_create_post_rejects_blank_title(cms_app) -> None:
    """Blank title re-renders the form at 400."""
    client, captured, _ = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)
    resp = client.post(
        "/admin/posts",
        data={
            "title": "   ",
            "body_md": "x",
            "status": "draft",
            "csrf_token": csrf,
        },
    )
    assert resp.status_code == 400
    assert "Title is required" in resp.text


# ---------------------------------------------------------------------------
# About page
# ---------------------------------------------------------------------------
def test_about_update(cms_app) -> None:
    """Editing the About page updates the stored copy."""
    client, captured, _ = cms_app
    _login(client, captured)
    form_resp = client.get("/admin/pages/about/edit")
    assert form_resp.status_code == 200
    match = _CSRF_META_RE.search(form_resp.text)
    assert match
    csrf = match.group(1)

    resp = client.post(
        "/admin/pages/about",
        data={
            "title": "Re-titled About",
            "body_md": "Edited **copy**.",
            "csrf_token": csrf,
        },
        follow_redirects=False,
    )
    assert resp.status_code == 303
    assert resp.headers["location"] == "/admin?msg=saved"

    # Public site reflects the change (cache was invalidated).
    public = client.get("/about")
    assert public.status_code == 200
    assert "Re-titled About" in public.text
    assert "<strong>copy</strong>" in public.text


# ---------------------------------------------------------------------------
# media upload
# ---------------------------------------------------------------------------
def _jpeg_bytes() -> bytes:
    img = Image.new("RGB", (32, 32), "blue")
    buf = io.BytesIO()
    img.save(buf, format="JPEG")
    return buf.getvalue()


def test_media_upload_happy_path(cms_app) -> None:
    """Valid JPEG upload with header CSRF returns JSON with a /media URL."""
    client, captured, media_root = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)

    data = _jpeg_bytes()
    files = {"file": ("photo.jpg", data, "image/jpeg")}
    resp = client.post(
        "/admin/media/upload",
        files=files,
        headers={"X-CSRF-Token": csrf},
    )
    assert resp.status_code == 200, resp.text
    payload = resp.json()
    assert payload["url"].startswith("/media/")
    assert payload["filename"].endswith(".jpg")

    # The file actually exists under the media root.
    stored = Path(media_root)
    assert any(stored.rglob("*.jpg"))


def test_media_upload_missing_csrf_is_forbidden(cms_app) -> None:
    """Without the X-CSRF-Token header the upload is 403."""
    client, captured, _ = cms_app
    _login(client, captured)
    # Warm cookie.
    client.get("/admin")
    files = {"file": ("x.jpg", _jpeg_bytes(), "image/jpeg")}
    resp = client.post("/admin/media/upload", files=files)
    assert resp.status_code == 403


def test_media_upload_rejects_non_image(cms_app) -> None:
    """Plain text rejected with a JSON error payload."""
    client, captured, _ = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)
    files = {"file": ("fake.jpg", b"not an image at all, really not", "image/jpeg")}
    resp = client.post(
        "/admin/media/upload",
        files=files,
        headers={"X-CSRF-Token": csrf},
    )
    assert resp.status_code == 400
    assert "error" in resp.json()


# ---------------------------------------------------------------------------
# preview
# ---------------------------------------------------------------------------
def test_preview_renders_sanitized_html(cms_app) -> None:
    """Preview endpoint returns the same sanitized HTML as server-side."""
    client, captured, _ = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)

    resp = client.post(
        "/admin/preview",
        data={"markdown": "Hello **there**."},
        headers={"X-CSRF-Token": csrf},
    )
    assert resp.status_code == 200
    assert "<strong>there</strong>" in resp.text


def test_preview_strips_raw_html(cms_app) -> None:
    """Raw HTML in the markdown input is sanitized away."""
    client, captured, _ = cms_app
    _login(client, captured)
    csrf = _dashboard_csrf(client)

    resp = client.post(
        "/admin/preview",
        data={"markdown": "<script>alert(1)</script>\n\nOK."},
        headers={"X-CSRF-Token": csrf},
    )
    assert resp.status_code == 200
    assert "<script>" not in resp.text


def test_preview_without_csrf_is_forbidden(cms_app) -> None:
    """Preview endpoint enforces CSRF via header."""
    client, captured, _ = cms_app
    _login(client, captured)
    client.get("/admin")  # warm cookie
    resp = client.post(
        "/admin/preview",
        data={"markdown": "hi"},
    )
    assert resp.status_code == 403