"""webdav_client.py against a real local WebDAV-ish HTTP server (Basic
auth + PROPFIND) -- no ORM, no FastAPI, pure protocol-level fetch/list
functions used by whiteboard frame mode."""

from __future__ import annotations

import base64
import threading
from http.server import BaseHTTPRequestHandler, HTTPServer

import pytest

from app.webdav_client import WebDavError, fetch_file, list_directory, parent_directory_url

_USERNAME = "alice"
_PASSWORD = "secret"
_FILE_BYTES = b'{"elements": [], "appState": {}}'

_PROPFIND_RESPONSE = b"""<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:">
  <d:response>
    <d:href>/dav/files/alice/Boards/</d:href>
    <d:propstat>
      <d:prop>
        <d:displayname>Boards</d:displayname>
        <d:resourcetype><d:collection/></d:resourcetype>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
  </d:response>
  <d:response>
    <d:href>/dav/files/alice/Boards/Family%20Board.whiteboard</d:href>
    <d:propstat>
      <d:prop>
        <d:displayname>Family Board.whiteboard</d:displayname>
        <d:resourcetype/>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
  </d:response>
  <d:response>
    <d:href>/dav/files/alice/Boards/Archive/</d:href>
    <d:propstat>
      <d:prop>
        <d:displayname>Archive</d:displayname>
        <d:resourcetype><d:collection/></d:resourcetype>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
  </d:response>
</d:multistatus>
"""

_AUTH_HEADER = "Basic " + base64.b64encode(f"{_USERNAME}:{_PASSWORD}".encode()).decode()


class _Handler(BaseHTTPRequestHandler):
    def _authed(self) -> bool:
        return self.headers.get("Authorization", "") == _AUTH_HEADER

    def do_GET(self):
        if self.path == "/dav/files/alice/Boards/Family%20Board.whiteboard":
            if not self._authed():
                self.send_response(401)
                self.end_headers()
                return
            self.send_response(200)
            self.end_headers()
            self.wfile.write(_FILE_BYTES)
            return
        self.send_response(404)
        self.end_headers()

    def do_PROPFIND(self):
        if not self._authed():
            self.send_response(401)
            self.end_headers()
            return
        self.send_response(207)
        self.send_header("Content-Type", "application/xml")
        self.end_headers()
        self.wfile.write(_PROPFIND_RESPONSE)

    def log_message(self, *args):
        pass


@pytest.fixture(scope="module")
def webdav_server():
    server = HTTPServer(("127.0.0.1", 0), _Handler)
    thread = threading.Thread(target=server.serve_forever, daemon=True)
    thread.start()
    port = server.server_address[1]
    try:
        yield f"http://127.0.0.1:{port}"
    finally:
        server.shutdown()
        thread.join()


def test_fetch_file_success(webdav_server):
    data = fetch_file(f"{webdav_server}/dav/files/alice/Boards/Family%20Board.whiteboard", _USERNAME, _PASSWORD)
    assert data == _FILE_BYTES


def test_fetch_file_wrong_password_raises(webdav_server):
    with pytest.raises(WebDavError):
        fetch_file(f"{webdav_server}/dav/files/alice/Boards/Family%20Board.whiteboard", _USERNAME, "wrong")


def test_fetch_file_missing_raises(webdav_server):
    with pytest.raises(WebDavError):
        fetch_file(f"{webdav_server}/dav/files/alice/Boards/nope.whiteboard", _USERNAME, _PASSWORD)


def test_list_directory_excludes_self_and_sorts_dirs_first(webdav_server):
    entries = list_directory(f"{webdav_server}/dav/files/alice/Boards/", _USERNAME, _PASSWORD)
    assert [e["name"] for e in entries] == ["Archive", "Family Board.whiteboard"]
    assert entries[0]["is_dir"] is True
    assert entries[1]["is_dir"] is False


def test_list_directory_wrong_password_raises(webdav_server):
    with pytest.raises(WebDavError):
        list_directory(f"{webdav_server}/dav/files/alice/Boards/", _USERNAME, "wrong")


def test_list_directory_urls_are_absolute(webdav_server):
    entries = list_directory(f"{webdav_server}/dav/files/alice/Boards/", _USERNAME, _PASSWORD)
    archive = next(e for e in entries if e["name"] == "Archive")
    assert archive["url"] == f"{webdav_server}/dav/files/alice/Boards/Archive/"


def test_parent_directory_url_stops_at_base():
    base = "https://cloud.example.com/dav/files/alice/"
    assert parent_directory_url(base, base) is None
    assert parent_directory_url(base, base + "Boards/") == base
    assert parent_directory_url(base, base + "Boards/Family/") == base + "Boards/"