"""
Document API tests — async only (Plan 05 cutover).

Legacy sync tests (using the flat-file storage layer) were deleted in Plan 05.
All tests here use async_client (httpx.AsyncClient + ASGITransport + in-memory SQLite).
"""
from __future__ import annotations

import re

import pytest


@pytest.mark.xfail(strict=False, reason="POST /api/documents/upload removed in Plan 03-02 — replaced by upload-url + confirm flow")
async def test_upload_txt_no_classify(async_client, sample_txt):
    """Legacy multipart upload test — endpoint removed in Plan 03-02 (D-04).

    Replaced by test_upload_url_endpoint + test_confirm_endpoint.
    """
    with open(sample_txt, "rb") as f:
        resp = await async_client.post(
            "/api/documents/upload",
            files={"file": ("sample.txt", f, "text/plain")},
            data={"auto_classify": "false"},
        )
    assert resp.status_code == 200
    data = resp.json()
    assert data["original_name"] == "sample.txt"


@pytest.mark.xfail(strict=False, reason="POST /api/documents/upload removed in Plan 03-02 — replaced by upload-url + confirm flow")
async def test_upload_pdf_no_classify(async_client, sample_pdf):
    """Legacy multipart upload test — endpoint removed in Plan 03-02 (D-04)."""
    with open(sample_pdf, "rb") as f:
        resp = await async_client.post(
            "/api/documents/upload",
            files={"file": ("sample.pdf", f, "application/pdf")},
            data={"auto_classify": "false"},
        )
    assert resp.status_code == 200


async def test_list_documents(async_client, auth_user):
    """GET /api/documents returns an empty list when no documents exist."""
    resp = await async_client.get("/api/documents", headers=auth_user["headers"])
    assert resp.status_code == 200
    data = resp.json()
    assert data["total"] == 0
    assert data["items"] == []


async def test_list_documents_filter_by_topic(async_client, auth_user, db_session):
    """GET /api/documents?topic=finance returns only matching documents."""
    import uuid as _uuid
    from db.models import Document
    from services import storage

    # Create a document directly via ORM (bypasses the upload endpoint)
    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.txt",
        content_type="text/plain",
        size_bytes=100,
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.txt",
    )
    db_session.add(doc)
    await db_session.commit()

    await storage.update_document_topics(db_session, str(doc_id), ["finance"])

    resp = await async_client.get("/api/documents?topic=finance", headers=auth_user["headers"])
    assert resp.json()["total"] == 1

    resp2 = await async_client.get("/api/documents?topic=legal", headers=auth_user["headers"])
    assert resp2.json()["total"] == 0


async def test_get_document(async_client, auth_user, db_session):
    """GET /api/documents/{id} returns metadata for an existing document."""
    import uuid as _uuid
    from db.models import Document

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.txt",
        content_type="text/plain",
        size_bytes=100,
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.txt",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.get(f"/api/documents/{doc_id}", headers=auth_user["headers"])
    assert resp.status_code == 200
    assert resp.json()["id"] == str(doc_id)


async def test_get_document_not_found(async_client, auth_user):
    resp = await async_client.get("/api/documents/nonexistent", headers=auth_user["headers"])
    assert resp.status_code == 404


async def test_delete_document(async_client, auth_user, db_session, monkeypatch):
    """DELETE /api/documents/{id} removes the document."""
    import uuid as _uuid
    from db.models import Document
    from unittest.mock import AsyncMock

    # Mock MinIO delete so we don't need a live MinIO
    monkeypatch.setattr("services.storage._backend", lambda: type("B", (), {"delete_object": AsyncMock()})())

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.txt",
        content_type="text/plain",
        size_bytes=0,
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.txt",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.delete(f"/api/documents/{doc_id}", headers=auth_user["headers"])
    assert resp.status_code == 200
    assert resp.json()["success"] is True

    resp2 = await async_client.get(f"/api/documents/{doc_id}", headers=auth_user["headers"])
    assert resp2.status_code == 404


async def test_delete_document_not_found(async_client, auth_user):
    resp = await async_client.delete("/api/documents/nonexistent", headers=auth_user["headers"])
    assert resp.status_code == 404


@pytest.mark.xfail(strict=False, reason="POST /api/documents/upload removed in Plan 03-02 — replaced by upload-url + confirm flow")
async def test_upload_empty_file(async_client):
    """Legacy empty file test — endpoint removed in Plan 03-02 (D-04)."""
    resp = await async_client.post(
        "/api/documents/upload",
        files={"file": ("empty.txt", b"", "text/plain")},
        data={"auto_classify": "false"},
    )
    assert resp.status_code == 400


@pytest.mark.xfail(strict=False, reason="POST /api/documents/upload removed in Plan 03-02 — replaced by upload-url + confirm flow")
async def test_upload_persists_to_postgres_and_minio(async_client, sample_txt):
    """Legacy upload+persist test — endpoint removed in Plan 03-02 (D-04).

    Replaced by the upload-url + confirm flow tested in test_upload_url_endpoint
    and test_confirm_endpoint.
    """
    with open(sample_txt, "rb") as f:
        resp = await async_client.post(
            "/api/documents/upload",
            files={"file": ("sample.txt", f, "text/plain")},
            data={"auto_classify": "false"},
        )
    assert resp.status_code == 200


# ---------------------------------------------------------------------------
# Wave 0 xfail stubs for Phase 3 document endpoint tests — Plans 03-02 / 03-03
# ---------------------------------------------------------------------------


async def test_upload_url_endpoint(async_client, auth_user, mock_minio_presigned):
    """POST /api/documents/upload-url returns {upload_url, document_id} and creates
    a Document row with status='pending'.

    D-05: two-step upload flow — step 1 creates the pending Document row and
    returns the presigned PUT URL (15-min TTL). Quota is NOT reserved here.
    """
    resp = await async_client.post(
        "/api/documents/upload-url",
        json={"filename": "report.pdf", "content_type": "application/pdf"},
        headers=auth_user["headers"],
    )
    assert resp.status_code == 200, resp.text
    data = resp.json()
    assert "upload_url" in data, f"Missing upload_url: {data}"
    assert "document_id" in data, f"Missing document_id: {data}"
    assert "presigned" in data["upload_url"] or "localhost" in data["upload_url"], (
        f"Expected a presigned URL: {data['upload_url']}"
    )
    # Verify mock was called
    assert mock_minio_presigned.called, "generate_presigned_put_url was not called"


async def test_confirm_endpoint(
    async_client, auth_user, mock_minio_presigned, mock_minio_stat, monkeypatch
):
    """POST /api/documents/{id}/confirm calls stat_object once, updates Document.size_bytes
    from the stat return value, sets Document.status='uploaded', and runs atomic quota.

    D-05: step 3 of the presigned upload flow. stat_object provides the authoritative
    file size (D-07). The atomic quota UPDATE runs unconditionally here (STORE-03, Plan 03-03+).

    SQLite note: The raw SQL quota UPDATE uses :uid in dashed UUID format, which does not
    match SQLite's CHAR(32) undashed storage. This test xfails on SQLite and xpasses on
    PostgreSQL (run with INTEGRATION=1). Same as test_quota.py pattern.
    """
    from unittest.mock import MagicMock

    # Patch out the Celery delay call — no Redis in unit test environment
    mock_delay = MagicMock()
    monkeypatch.setattr("api.documents.extract_and_classify.delay", mock_delay)

    mock_minio_stat.return_value = 2048

    # Step 1: get upload URL
    resp = await async_client.post(
        "/api/documents/upload-url",
        json={"filename": "doc.txt", "content_type": "text/plain"},
        headers=auth_user["headers"],
    )
    assert resp.status_code == 200, resp.text
    doc_id = resp.json()["document_id"]

    # Step 2: confirm — quota runs unconditionally (Plan 03-03+, no Wave 2 guard)
    conf_resp = await async_client.post(
        f"/api/documents/{doc_id}/confirm",
        headers=auth_user["headers"],
    )
    assert conf_resp.status_code == 200, conf_resp.text
    conf_data = conf_resp.json()
    assert conf_data["id"] == doc_id
    assert conf_data["size_bytes"] == 2048
    assert conf_data["status"] == "uploaded"
    # stat_object was called once
    assert mock_minio_stat.called, "stat_object was not called"
    # Celery task was dispatched
    assert mock_delay.called, "extract_and_classify.delay was not called"


async def test_get_quota(async_client, auth_user):
    """GET /api/auth/me/quota returns {used_bytes: 0, limit_bytes: 104857600}.

    STORE-04: quota usage bar endpoint. Returns current usage and limit for the
    authenticated user. Newly created users start at used_bytes=0.
    """
    resp = await async_client.get(
        "/api/auth/me/quota",
        headers=auth_user["headers"],
    )
    assert resp.status_code == 200, resp.text
    data = resp.json()
    assert "used_bytes" in data, f"Missing used_bytes: {data}"
    assert "limit_bytes" in data, f"Missing limit_bytes: {data}"
    assert data["used_bytes"] == 0, f"Expected 0 used_bytes for new user: {data}"
    assert data["limit_bytes"] == 104_857_600, f"Expected 100 MB limit: {data}"


async def test_cross_user_access_404(async_client, auth_user, db_session):
    """User B's request for GET /api/documents/{A_doc_id} returns 404.

    SEC-04: cross-user access returns 404 (not 403) to avoid information leakage
    (CONTEXT.md D-16). An attacker cannot distinguish between 'document does not
    exist' and 'document belongs to someone else'.
    """
    import uuid as _uuid
    from db.models import Document, User, Quota
    from services.auth import hash_password, create_access_token

    # Create User A's document directly via ORM
    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="user_a_doc.txt",
        content_type="text/plain",
        size_bytes=100,
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.txt",
    )
    db_session.add(doc)

    # Create User B
    user_b_id = _uuid.uuid4()
    user_b = User(
        id=user_b_id,
        handle=f"user_b_{user_b_id.hex[:8]}",
        email=f"user_b_{user_b_id.hex[:8]}@example.com",
        password_hash=hash_password("Testpassword123!"),
        role="user",
        is_active=True,
        password_must_change=False,
    )
    quota_b = Quota(user_id=user_b_id, limit_bytes=104857600, used_bytes=0)
    db_session.add(user_b)
    db_session.add(quota_b)
    await db_session.commit()

    token_b = create_access_token(str(user_b_id), "user")
    headers_b = {"Authorization": f"Bearer {token_b}"}

    # User B attempts to access User A's document — must get 404 (not 403)
    resp = await async_client.get(f"/api/documents/{doc_id}", headers=headers_b)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-user access, got {resp.status_code}: {resp.text}"
    )


async def test_admin_cannot_access_documents(async_client, admin_user):
    """GET /api/documents using admin_user.headers returns 403.

    SEC-04 SC4: admin accounts cannot access document content (CLAUDE.md +
    CONTEXT.md D-16). The get_regular_user dependency enforces this for all
    /api/documents/* handlers.
    """
    resp = await async_client.get("/api/documents", headers=admin_user["headers"])
    assert resp.status_code == 403, (
        f"Expected 403 for admin on document endpoints, got {resp.status_code}: {resp.text}"
    )


async def test_documents_require_auth(async_client):
    """Anonymous GET /api/documents (no Authorization header) returns 401 or 403.

    D-16: all /api/documents/* endpoints require authentication via
    get_current_user (Phase 2 D-07 fulfilled in Phase 3).
    """
    resp = await async_client.get("/api/documents")
    assert resp.status_code in (401, 403), f"Expected 401 or 403, got {resp.status_code}"


# ---------------------------------------------------------------------------
# Phase 4 DOC-02 proxy / content-stream tests
# ---------------------------------------------------------------------------


async def test_content_stream_200(async_client, auth_user, db_session, monkeypatch):
    """GET /api/documents/{id}/content returns 200 with correct Content-Type and Content-Disposition: inline."""
    import uuid as _uuid
    from unittest.mock import AsyncMock
    from db.models import Document
    from storage.minio_backend import MinIOBackend

    file_bytes = b"Hello, PDF content!"
    monkeypatch.setattr(MinIOBackend, "get_object", AsyncMock(return_value=file_bytes), raising=False)

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.pdf",
        content_type="application/pdf",
        size_bytes=len(file_bytes),
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers=auth_user["headers"],
    )
    assert resp.status_code == 200
    assert resp.content == file_bytes
    assert resp.headers["content-type"].startswith("application/pdf")
    assert "inline" in resp.headers.get("content-disposition", "")


async def test_content_stream_206_range(async_client, auth_user, db_session, monkeypatch):
    """GET /api/documents/{id}/content with Range header returns 206 and Content-Range header."""
    import uuid as _uuid
    from unittest.mock import AsyncMock
    from db.models import Document
    from storage.minio_backend import MinIOBackend

    file_bytes = b"0123456789ABCDEF"  # 16 bytes
    monkeypatch.setattr(MinIOBackend, "get_object", AsyncMock(return_value=file_bytes), raising=False)

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.pdf",
        content_type="application/pdf",
        size_bytes=len(file_bytes),
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers={**auth_user["headers"], "Range": "bytes=0-7"},
    )
    assert resp.status_code == 206
    assert resp.content == b"01234567"
    assert "content-range" in resp.headers
    assert resp.headers["content-range"] == "bytes 0-7/16"


async def test_content_stream_admin_403(async_client, admin_user, db_session, monkeypatch):
    """GET /api/documents/{id}/content with admin JWT returns 403."""
    import uuid as _uuid
    from unittest.mock import AsyncMock
    from db.models import Document
    from storage.minio_backend import MinIOBackend

    file_bytes = b"admin should not see this"
    monkeypatch.setattr(MinIOBackend, "get_object", AsyncMock(return_value=file_bytes), raising=False)

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=admin_user["user"].id,
        filename="test.pdf",
        content_type="application/pdf",
        size_bytes=len(file_bytes),
        storage_backend="minio",
        status="uploaded",
        object_key=f"{admin_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers=admin_user["headers"],
    )
    assert resp.status_code == 403


async def test_content_stream_no_presigned_url(async_client, auth_user, db_session, monkeypatch):
    """GET /api/documents/{id}/content response does not call presigned_get_url."""
    import uuid as _uuid
    from unittest.mock import AsyncMock, MagicMock
    from db.models import Document
    from storage.minio_backend import MinIOBackend

    file_bytes = b"document content"
    get_object_mock = AsyncMock(return_value=file_bytes)
    presigned_mock = AsyncMock(return_value="http://minio/presigned?X-Amz-Signature=FAKE")
    monkeypatch.setattr(MinIOBackend, "get_object", get_object_mock, raising=False)
    monkeypatch.setattr(MinIOBackend, "presigned_get_url", presigned_mock, raising=False)

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.pdf",
        content_type="application/pdf",
        size_bytes=len(file_bytes),
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers=auth_user["headers"],
    )
    assert resp.status_code == 200
    # presigned_get_url must NEVER be called
    presigned_mock.assert_not_called()
    # get_object must be called (direct fetch)
    get_object_mock.assert_called_once()


async def test_content_stream_share_recipient_200(async_client, auth_user, admin_user, db_session, monkeypatch):
    """Share recipient can access document content via GET /api/documents/{id}/content."""
    import uuid as _uuid
    from unittest.mock import AsyncMock
    from db.models import Document, Share
    from storage.minio_backend import MinIOBackend

    file_bytes = b"shared document content"
    monkeypatch.setattr(MinIOBackend, "get_object", AsyncMock(return_value=file_bytes), raising=False)

    # Create a regular user as recipient (use auth_user as recipient, admin_user as owner)
    # But we need two regular users; use auth_user as owner and create a second regular user
    import uuid as _uuid2
    from db.models import User, Quota
    from services.auth import hash_password, create_access_token

    recipient_id = _uuid2.uuid4()
    recipient = User(
        id=recipient_id,
        handle=f"recipient_{recipient_id.hex[:8]}",
        email=f"recipient_{recipient_id.hex[:8]}@example.com",
        password_hash=hash_password("Testpassword123!"),
        role="user",
        is_active=True,
        password_must_change=False,
    )
    recipient_quota = Quota(user_id=recipient_id, limit_bytes=104857600, used_bytes=0)
    db_session.add(recipient)
    db_session.add(recipient_quota)
    await db_session.flush()

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="shared.pdf",
        content_type="application/pdf",
        size_bytes=len(file_bytes),
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.flush()

    share = Share(
        document_id=doc_id,
        owner_id=auth_user["user"].id,
        recipient_id=recipient_id,
        permission="view",
    )
    db_session.add(share)
    await db_session.commit()

    recipient_token = create_access_token(str(recipient_id), "user")
    recipient_headers = {"Authorization": f"Bearer {recipient_token}"}

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers=recipient_headers,
    )
    assert resp.status_code == 200
    assert resp.content == file_bytes


async def test_content_stream_not_found(async_client, auth_user):
    """GET /api/documents/{id}/content returns 404 for unknown document ID."""
    import uuid as _uuid
    resp = await async_client.get(
        f"/api/documents/{_uuid.uuid4()}/content",
        headers=auth_user["headers"],
    )
    assert resp.status_code == 404


async def test_content_stream_invalid_id(async_client, auth_user):
    """GET /api/documents/{id}/content returns 404 for invalid UUID."""
    resp = await async_client.get(
        "/api/documents/not-a-uuid/content",
        headers=auth_user["headers"],
    )
    assert resp.status_code == 404


async def test_parse_range_416(async_client, auth_user, db_session, monkeypatch):
    """GET /api/documents/{id}/content with invalid Range returns 416."""
    import uuid as _uuid
    from unittest.mock import AsyncMock
    from db.models import Document
    from storage.minio_backend import MinIOBackend

    file_bytes = b"short"
    monkeypatch.setattr(MinIOBackend, "get_object", AsyncMock(return_value=file_bytes), raising=False)

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="test.pdf",
        content_type="application/pdf",
        size_bytes=len(file_bytes),
        storage_backend="minio",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.commit()

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers={**auth_user["headers"], "Range": "bytes=100-200"},
    )
    assert resp.status_code == 416


async def test_stream_document_content_cloud_backend_error(async_client, auth_user, db_session, monkeypatch):
    """GET /api/documents/{id}/content returns 502 when cloud backend raises a non-CloudConnectionError exception.

    Plan 05-12 gap closure: broad except-clause catches RuntimeError, timeout, etc. and
    returns a user-friendly 502 instead of an opaque 500.
    """
    import uuid as _uuid
    from unittest.mock import AsyncMock
    from db.models import Document

    doc_id = _uuid.uuid4()
    doc = Document(
        id=doc_id,
        user_id=auth_user["user"].id,
        filename="cloud_doc.pdf",
        content_type="application/pdf",
        size_bytes=1024,
        storage_backend="google_drive",
        status="uploaded",
        object_key=f"{auth_user['user'].id}/{doc_id}/{_uuid.uuid4()}.pdf",
    )
    db_session.add(doc)
    await db_session.commit()

    async def raise_runtime_error(*args, **kwargs):
        raise RuntimeError("connection timeout")

    monkeypatch.setattr("api.documents.get_storage_backend_for_document", raise_runtime_error)

    resp = await async_client.get(
        f"/api/documents/{doc_id}/content",
        headers=auth_user["headers"],
    )
    assert resp.status_code == 502, f"Expected 502, got {resp.status_code}: {resp.text}"
    assert "Cloud backend unreachable" in resp.json()["detail"]


# ---------------------------------------------------------------------------
# Phase 6.2 Wave 0 xfail stubs — cloud document delete
# ---------------------------------------------------------------------------


async def test_delete_cloud_document_propagates(async_client, auth_user, db_session):
    """DELETE /api/documents/{id} for a cloud doc calls cloud backend delete_object (D-01)"""
    pytest.xfail("Phase 6.2 — not implemented yet")


async def test_delete_cloud_document_failure(async_client, auth_user, db_session):
    """DELETE /api/documents/{id} returns cloud_delete_failed=True when provider raises (D-03)"""
    pytest.xfail("Phase 6.2 — not implemented yet")


async def test_delete_cloud_remove_only(async_client, auth_user, db_session):
    """DELETE /api/documents/{id}?remove_only=true skips cloud delete, removes DB row only (D-02)"""
    pytest.xfail("Phase 6.2 — not implemented yet")