from datetime import datetime
from io import BytesIO
from pathlib import Path
import asyncio
import sys
import types

import pytest
from fastapi import HTTPException, UploadFile, Request

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from app.utils.safe_html import sanitize_safe_html

# Keep these focused unit tests independent of optional auth runtime packages.
auth_dependencies_stub = types.ModuleType("app.core.auth_dependencies")


def _allow_test_user(*_permissions):
    async def dependency(_request: Request):
        return {"id": 1, "username": "test", "permissions": []}

    return dependency


auth_dependencies_stub.require_any_permission = _allow_test_user


async def _get_test_user(_request: Request):
    return {
        "id": 1,
        "username": "test",
        "permissions": ["cases.view", "cases.create", "cases.edit", "cases.delete"],
    }


auth_dependencies_stub.get_current_user = _get_test_user
sys.modules.setdefault("app.core.auth_dependencies", auth_dependencies_stub)

from app.modules.sag.backend import router as sag_router


def test_normalize_timestamp_converts_offset_to_utc():
    value = sag_router._normalize_optional_timestamp(
        "2026-07-27T12:00:00+02:00",
        "deadline",
    )

    assert value == "2026-07-27 10:00:00"


def test_normalize_timestamp_accepts_naive_datetime():
    value = sag_router._normalize_optional_timestamp(
        datetime(2026, 7, 27, 12, 30),
        "deadline",
    )

    assert value == "2026-07-27 12:30:00"


def test_normalize_timestamp_rejects_invalid_value():
    with pytest.raises(HTTPException) as exc_info:
        sag_router._normalize_optional_timestamp("not-a-date", "deadline")

    assert exc_info.value.status_code == 400


def test_attachment_path_rejects_escape_from_upload_root():
    with pytest.raises(HTTPException) as exc_info:
        sag_router._resolve_attachment_path("../../outside.txt")

    assert exc_info.value.status_code == 400


def test_attachment_path_accepts_case_subdirectory():
    path = sag_router._resolve_attachment_path("sag_files/example.txt")

    path.relative_to(sag_router.UPLOAD_BASE_PATH)


def test_upload_rejects_disallowed_extension():
    upload = UploadFile(filename="payload.html", file=BytesIO(b"<script>alert(1)</script>"))

    with pytest.raises(HTTPException) as exc_info:
        sag_router._store_upload_file(upload, sag_router.SAG_FILE_SUBDIR)

    assert exc_info.value.status_code == 400
    assert "not allowed" in str(exc_info.value.detail)


def test_relation_input_normalizes_valid_relation():
    target_id, relation_type = sag_router._normalize_relation_input(
        10,
        {"målsag_id": "11", "relationstype": " Blokkerer "},
    )

    assert target_id == 11
    assert relation_type == "Blokkerer"


@pytest.mark.parametrize(
    ("raw_type", "expected"),
    [
        ("Relateret til", "Relateret til"),
        ("Afledt af", "Afledt af"),
        ("Årsag til", "Årsag til"),
        ("afledt_af", "Afledt af"),
        ("afhænger af", "afhænger af"),
        ("undersag", "undersag"),
        ("duplikat", "duplikat"),
    ],
)
def test_relation_input_accepts_ui_and_existing_database_types(raw_type, expected):
    _, relation_type = sag_router._normalize_relation_input(
        10,
        {"målsag_id": 11, "relationstype": raw_type},
    )

    assert relation_type == expected


def test_relation_quick_task_uses_todo_steps_api():
    template = Path("app/modules/sag/templates/detail_v3.html").read_text()

    assert "fetch(`/api/v1/sag/${caseId}/todo-steps`" in template
    assert "fetch(`/api/v1/sag/${caseId}/todos`" not in template
    assert "due_date: due" in template


def test_safe_case_html_renders_formatting_and_drops_executable_code():
    result = sanitize_safe_html(
        '<style>body{display:none}</style>'
        '<p onclick="steal()">Hej <strong>verden</strong></p>'
        '<script>alert("xss")</script>'
        '<a href="javascript:alert(1)">farligt link</a>'
    )

    assert result == (
        '<p>Hej <strong>verden</strong></p>'
        '<a target="_blank" rel="noopener noreferrer">farligt link</a>'
    )
    assert "display:none" not in result
    assert "alert" not in result
    assert "onclick" not in result


@pytest.mark.parametrize(
    "payload",
    [
        {"målsag_id": 10, "relationstype": "barn"},
        {"målsag_id": 11, "relationstype": "ukendt"},
        {"målsag_id": "ikke-et-tal", "relationstype": "barn"},
    ],
)
def test_relation_input_rejects_invalid_relation(payload):
    with pytest.raises(HTTPException) as exc_info:
        sag_router._normalize_relation_input(10, payload)

    assert exc_info.value.status_code == 400


def _request(method: str, path: str) -> Request:
    return Request(
        {
            "type": "http",
            "method": method,
            "path": path,
            "raw_path": path.encode(),
            "query_string": b"",
            "headers": [],
            "scheme": "https",
            "server": ("testserver", 443),
            "client": ("127.0.0.1", 1234),
        }
    )


def test_case_route_access_allows_view_permission_for_get():
    user = {"permissions": ["cases.view"]}

    result = asyncio.run(
        sag_router.case_route_access(_request("GET", "/api/v1/sag/10"), user)
    )

    assert result is user


def test_case_route_access_requires_edit_for_nested_post():
    user = {"permissions": ["cases.view", "cases.create"]}

    with pytest.raises(HTTPException) as exc_info:
        asyncio.run(
            sag_router.case_route_access(
                _request("POST", "/api/v1/sag/10/tags"),
                user,
            )
        )

    assert exc_info.value.status_code == 403