"""Tests for tools/filestation.py: list_shares and list_dir."""

from __future__ import annotations

import base64
import json
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from mcp_synology_filestation.client import SynologyError
from mcp_synology_filestation.config import AppConfig, ConnectionConfig


@pytest.fixture()
def config() -> AppConfig:
    return AppConfig(
        schema_version=1,
        connection=ConnectionConfig(host="nas.example.com"),
    )


def _make_mcp_and_tools(config: AppConfig, client: MagicMock) -> dict:
    """Register FileStation tools on a mock FastMCP and collect them by name."""
    from mcp_synology_filestation.tools.filestation import register_filestation

    registered: dict[str, object] = {}

    mcp = MagicMock()

    def tool_decorator():
        """Simulate @mcp.tool() — capture the decorated function."""

        def decorator(fn):
            registered[fn.__name__] = fn
            return fn

        return decorator

    mcp.tool = tool_decorator
    register_filestation(mcp, config, client)
    return registered


# ──────────────────────────────────────────────────────────────────────────
# list_shares
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_list_shares_success(config: AppConfig) -> None:
    """list_shares returns a formatted table on success."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={
            "shares": [
                {
                    "name": "data",
                    "path": "/data",
                    "additional": {
                        "real_path": "/volume1/data",
                        "volume_status": {
                            "totalspace": 2_000_000_000,
                            "usedspace": 500_000_000,
                        },
                    },
                },
                {
                    "name": "photos",
                    "path": "/photos",
                    "additional": {
                        "real_path": "/volume1/photos",
                        "volume_status": {},
                    },
                },
            ]
        }
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_shares"]()

    assert "data" in result
    assert "/data" in result  # share path, not volume path
    assert "/volume1/data" not in result
    assert "photos" in result
    assert "2 share(s) found" in result
    # Check usage percentage appears
    assert "%" in result


@pytest.mark.asyncio
async def test_list_shares_empty(config: AppConfig) -> None:
    """list_shares returns a friendly message when no shares exist."""
    client = MagicMock()
    client.request = AsyncMock(return_value={"shares": []})

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_shares"]()

    assert "No shared folders" in result


@pytest.mark.asyncio
async def test_list_shares_dsm_error(config: AppConfig) -> None:
    """list_shares returns an Error: message on SynologyError."""
    client = MagicMock()
    client.request = AsyncMock(
        side_effect=SynologyError("Permission denied — check DSM user permissions", code=105)
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_shares"]()

    assert result.startswith("Error:")
    assert "Permission denied" in result


# ──────────────────────────────────────────────────────────────────────────
# list_dir
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_list_dir_success(config: AppConfig) -> None:
    """list_dir returns a formatted table with name, type, size, and modified columns."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={
            "total": 3,
            "files": [
                {
                    "name": "documents",
                    "isdir": True,
                    "additional": {"size": 0, "time": {"mtime": 1700000000}},
                },
                {
                    "name": "photo.jpg",
                    "isdir": False,
                    "additional": {"size": 2_048_000, "time": {"mtime": 1710000000}},
                },
                {
                    "name": "readme.txt",
                    "isdir": False,
                    "additional": {"size": 512, "time": {"mtime": 1720000000}},
                },
            ],
        }
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_dir"](path="/dev")

    assert "documents" in result
    assert "photo.jpg" in result
    assert "readme.txt" in result
    assert "dir" in result
    assert "file" in result
    # Size column: dirs show "-", files show human-readable size
    assert "2 MB" in result or "1 MB" in result  # photo.jpg ~2 MB
    assert "512 B" in result  # readme.txt
    # Modified column present
    assert "Modified" in result
    assert "Showing 1–3 of 3 item(s)" in result


@pytest.mark.asyncio
async def test_list_dir_pagination(config: AppConfig) -> None:
    """list_dir shows pagination hint when more items are available."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={
            "total": 200,
            "files": [
                {
                    "name": f"file{i}.txt",
                    "isdir": False,
                    "additional": {"size": 100, "time": {"mtime": 1700000000}},
                }
                for i in range(100)
            ],
        }
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_dir"](path="/volume1/data", limit=100)

    assert "Showing 1–100 of 200" in result
    assert "offset=100" in result


@pytest.mark.asyncio
async def test_list_dir_empty(config: AppConfig) -> None:
    """list_dir returns a friendly message for empty directories."""
    client = MagicMock()
    client.request = AsyncMock(return_value={"total": 0, "files": []})

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_dir"](path="/volume1/empty")

    assert "empty" in result.lower() or "does not exist" in result.lower()


@pytest.mark.asyncio
async def test_list_dir_invalid_sort_by(config: AppConfig) -> None:
    """list_dir returns an Error: message for invalid sort_by."""
    client = MagicMock()
    client.request = AsyncMock()

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_dir"](path="/volume1/data", sort_by="invalid_field")

    assert result.startswith("Error:")
    assert "sort_by" in result
    client.request.assert_not_called()


@pytest.mark.asyncio
async def test_list_dir_invalid_sort_direction(config: AppConfig) -> None:
    """list_dir returns an Error: message for invalid sort_direction."""
    client = MagicMock()
    client.request = AsyncMock()

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_dir"](path="/volume1/data", sort_direction="random")

    assert result.startswith("Error:")
    assert "sort_direction" in result
    client.request.assert_not_called()


@pytest.mark.asyncio
async def test_list_dir_limit_clamped(config: AppConfig) -> None:
    """list_dir clamps limit to _MAX_LIMIT (500)."""
    client = MagicMock()
    client.request = AsyncMock(return_value={"total": 1, "files": []})

    tools = _make_mcp_and_tools(config, client)
    await tools["list_dir"](path="/volume1/data", limit=9999)

    call_params = client.request.call_args[1]["params"]
    assert call_params["limit"] == 500


@pytest.mark.asyncio
async def test_list_dir_dsm_error(config: AppConfig) -> None:
    """list_dir returns Error: on SynologyError (e.g. path not found)."""
    client = MagicMock()
    client.request = AsyncMock(side_effect=SynologyError("File or folder not found", code=1800))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["list_dir"](path="/volume1/nonexistent")

    assert result.startswith("Error:")
    assert "not found" in result.lower()


# ──────────────────────────────────────────────────────────────────────────
# get_info
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_get_info_single_file(config: AppConfig) -> None:
    """get_info returns a table with metadata for a single file."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={
            "files": [
                {
                    "path": "/dev/notes.txt",
                    "name": "notes.txt",
                    "isdir": False,
                    "additional": {
                        "real_path": "/volume1/dev/notes.txt",
                        "size": 1024,
                        "time": {"mtime": 1700000000, "crtime": 1690000000},
                        "owner": {"user": "marcus", "group": "users"},
                        "perm": {"posix": 0o644},
                    },
                }
            ]
        }
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["get_info"](path="/dev/notes.txt")

    assert "/dev/notes.txt" in result
    assert "file" in result
    assert "1 KB" in result or "1024 B" in result
    assert "marcus" in result
    assert "users" in result
    assert "644" in result
    assert "/volume1/dev/notes.txt" in result
    assert "1 item(s)" in result


@pytest.mark.asyncio
async def test_get_info_directory(config: AppConfig) -> None:
    """get_info shows '-' for size of a directory."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={
            "files": [
                {
                    "path": "/dev",
                    "name": "dev",
                    "isdir": True,
                    "additional": {
                        "real_path": "/volume1/dev",
                        "size": 0,
                        "time": {"mtime": 1700000000, "crtime": 1690000000},
                        "owner": {"user": "marcus", "group": "users"},
                        "perm": {"posix": 0o755},
                    },
                }
            ]
        }
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["get_info"](path="/dev")

    assert "dir" in result
    assert "755" in result
    # Size for directory should be "-"
    rows = [line for line in result.splitlines() if "/dev" in line and "|" in line]
    assert rows, "expected a data row containing /dev"
    size_col = rows[0].split("|")[3].strip()
    assert size_col == "-"


@pytest.mark.asyncio
async def test_get_info_multiple_paths(config: AppConfig) -> None:
    """get_info handles comma-separated paths and returns one row per item."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={
            "files": [
                {
                    "path": "/dev/a.txt",
                    "name": "a.txt",
                    "isdir": False,
                    "additional": {
                        "size": 100,
                        "time": {"mtime": 1700000000, "crtime": 1690000000},
                        "owner": {"user": "marcus", "group": "users"},
                        "perm": {"posix": 0o644},
                    },
                },
                {
                    "path": "/data/b.txt",
                    "name": "b.txt",
                    "isdir": False,
                    "additional": {
                        "size": 200,
                        "time": {"mtime": 1700000001, "crtime": 1690000001},
                        "owner": {"user": "marcus", "group": "users"},
                        "perm": {"posix": 0o644},
                    },
                },
            ]
        }
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["get_info"](path="/dev/a.txt,/data/b.txt")

    assert "/dev/a.txt" in result
    assert "/data/b.txt" in result
    assert "2 item(s)" in result

    # Verify the API received paths as a JSON array (confirmed working format)
    call_params = client.request.call_args[1]["params"]
    assert call_params["path"] == json.dumps(["/dev/a.txt", "/data/b.txt"])


@pytest.mark.asyncio
async def test_get_info_empty_path(config: AppConfig) -> None:
    """get_info returns Error: when path is empty."""
    client = MagicMock()
    client.request = AsyncMock()

    tools = _make_mcp_and_tools(config, client)
    result = await tools["get_info"](path="   ")

    assert result.startswith("Error:")
    client.request.assert_not_called()


@pytest.mark.asyncio
async def test_get_info_dsm_error(config: AppConfig) -> None:
    """get_info returns Error: on SynologyError."""
    client = MagicMock()
    client.request = AsyncMock(side_effect=SynologyError("File or folder not found", code=1800))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["get_info"](path="/dev/missing.txt")

    assert result.startswith("Error:")
    assert "not found" in result.lower()


@pytest.mark.asyncio
async def test_get_info_uses_getinfo_method(config: AppConfig) -> None:
    """get_info calls SYNO.FileStation.List with method='getinfo'."""
    client = MagicMock()
    client.request = AsyncMock(return_value={"files": []})

    tools = _make_mcp_and_tools(config, client)
    await tools["get_info"](path="/dev/file.txt")

    client.request.assert_called_once()
    call_args = client.request.call_args
    assert call_args[0][0] == "SYNO.FileStation.List"
    assert call_args[0][1] == "getinfo"


# ──────────────────────────────────────────────────────────────────────────
# search
# ──────────────────────────────────────────────────────────────────────────

_SEARCH_FILE = {
    "path": "/docker/app/compose.yaml",
    "name": "compose.yaml",
    "isdir": False,
    "additional": {"size": 1024, "time": {"mtime": 1700000000}},
}


@pytest.mark.asyncio
async def test_search_success(config: AppConfig) -> None:
    """search returns a formatted table after polling two rounds until finished=True."""
    client = MagicMock()

    call_count = 0

    async def _request(api, method, **kwargs):
        nonlocal call_count
        call_count += 1
        if method == "start":
            return {"taskid": "abc123", "has_not_index_share": False}
        if method == "list":
            # First poll: not finished yet; second poll: finished
            finished = call_count >= 4  # start=1, list1=2, list2=3 → finished on call 3
            return {"files": [_SEARCH_FILE], "finished": finished, "total": 1}
        if method == "clean":
            return {}
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["search"](path="/docker", pattern="*.yaml")

    assert "/docker/app/compose.yaml" in result
    assert "file" in result
    assert "1 match(es) found" in result
    # Verify start was called with correct params
    start_call = client.request.call_args_list[0]
    assert start_call[0][0] == "SYNO.FileStation.Search"
    assert start_call[0][1] == "start"
    assert start_call[1]["params"]["folder_path"] == "/docker"
    assert start_call[1]["params"]["pattern"] == "*.yaml"
    assert start_call[1]["params"]["recursive"] == "true"
    # Verify clean was called last
    last_call = client.request.call_args_list[-1]
    assert last_call[0][1] == "clean"
    assert last_call[1]["params"]["taskid"] == "abc123"


@pytest.mark.asyncio
async def test_search_polls_until_finished(config: AppConfig) -> None:
    """search keeps polling when finished=False and stops once finished=True."""
    client = MagicMock()
    poll_calls = 0

    async def _request(api, method, **kwargs):
        nonlocal poll_calls
        if method == "start":
            return {"taskid": "t1"}
        if method == "list":
            poll_calls += 1
            return {
                "files": [_SEARCH_FILE],
                "finished": poll_calls >= 3,  # finish on third list call
                "total": 1,
            }
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["search"](path="/docker", pattern="*.yaml")

    assert poll_calls == 3
    assert "1 match(es) found" in result


@pytest.mark.asyncio
async def test_search_empty_final_poll(config: AppConfig) -> None:
    """search returns results from an earlier poll when the final finished=True poll is empty.

    DSM can return files=[]] on the finishing poll even when results exist — the tool
    must retain the last non-empty result set rather than overwriting with [].
    """
    client = MagicMock()
    poll_calls = 0

    async def _request(api, method, **kwargs):
        nonlocal poll_calls
        if method == "start":
            return {"taskid": "t_empty_final"}
        if method == "list":
            poll_calls += 1
            if poll_calls == 1:
                # First poll: results available, not yet finished
                return {"files": [_SEARCH_FILE], "finished": False, "total": 1}
            # Second poll: finished, but DSM returns empty files
            return {"files": [], "finished": True, "total": 1}
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["search"](path="/docker", pattern="*.yaml")

    # Must surface the result from the first poll, not treat the empty final as "no results"
    assert "1 match(es) found" in result
    assert "/docker/app/compose.yaml" in result


@pytest.mark.asyncio
async def test_search_no_results(config: AppConfig) -> None:
    """search returns a friendly message when no files are found."""
    client = MagicMock()

    async def _request(api, method, **kwargs):
        if method == "start":
            return {"taskid": "t2"}
        if method == "list":
            return {"files": [], "finished": True, "total": 0}
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["search"](path="/docker", pattern="*.txt")

    assert "No files" in result or "not found" in result.lower()


@pytest.mark.asyncio
async def test_search_start_dsm_error(config: AppConfig) -> None:
    """search returns Error: immediately when the start call fails."""
    client = MagicMock()
    client.request = AsyncMock(
        side_effect=SynologyError("Permission denied — check DSM user permissions", code=105)
    )

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["search"](path="/docker", pattern="*.yaml")

    assert result.startswith("Error:")
    assert "Permission denied" in result


@pytest.mark.asyncio
async def test_search_list_dsm_error(config: AppConfig) -> None:
    """search returns Error: and cleans up when a list poll fails."""
    client = MagicMock()

    async def _request(api, method, **kwargs):
        if method == "start":
            return {"taskid": "t3"}
        if method == "list":
            raise SynologyError("Unknown error", code=100)
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["search"](path="/docker", pattern="*.yaml")

    assert result.startswith("Error:")
    # clean should have been attempted
    clean_calls = [c for c in client.request.call_args_list if c[0][1] == "clean"]
    assert len(clean_calls) == 1


@pytest.mark.asyncio
async def test_search_recursive_false(config: AppConfig) -> None:
    """search passes recursive=false when recursive=False."""
    client = MagicMock()

    async def _request(api, method, **kwargs):
        if method == "start":
            return {"taskid": "t4"}
        if method == "list":
            return {"files": [], "finished": True, "total": 0}
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        await tools["search"](path="/docker", pattern="*.yaml", recursive=False)

    start_call = client.request.call_args_list[0]
    assert start_call[1]["params"]["recursive"] == "false"


@pytest.mark.asyncio
async def test_search_additional_format(config: AppConfig) -> None:
    """search uses json.dumps(["size","time"]) for additional parameter."""
    client = MagicMock()

    async def _request(api, method, **kwargs):
        if method == "start":
            return {"taskid": "t5"}
        if method == "list":
            return {"files": [], "finished": True, "total": 0}
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)

    with patch("asyncio.sleep", new_callable=AsyncMock):
        await tools["search"](path="/docker", pattern="*.yaml")

    list_call = client.request.call_args_list[1]
    assert list_call[1]["params"]["additional"] == json.dumps(["size", "time"])


# ──────────────────────────────────────────────────────────────────────────
# download
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_download_success(config: AppConfig) -> None:
    """download returns JSON with filename, size, and valid base64 content."""
    content = b"hello, world"
    client = MagicMock()
    client.download_bytes = AsyncMock(return_value=("compose.yaml", content))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["download"](path="/docker/app/compose.yaml")

    parsed = json.loads(result)
    assert parsed["filename"] == "compose.yaml"
    assert parsed["size"] == len(content)
    assert base64.b64decode(parsed["content_base64"]) == content


@pytest.mark.asyncio
async def test_download_size_limit(config: AppConfig) -> None:
    """download returns Error: when file exceeds 10 MB."""
    large_content = b"x" * (10 * 1024 * 1024 + 1)
    client = MagicMock()
    client.download_bytes = AsyncMock(return_value=("bigfile.bin", large_content))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["download"](path="/data/bigfile.bin")

    assert result.startswith("Error:")
    assert "10 MB" in result or "exceeds" in result


@pytest.mark.asyncio
async def test_download_dsm_error(config: AppConfig) -> None:
    """download returns Error: on SynologyError."""
    client = MagicMock()
    client.download_bytes = AsyncMock(
        side_effect=SynologyError("File or folder not found", code=1800)
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["download"](path="/data/missing.txt")

    assert result.startswith("Error:")
    assert "not found" in result.lower()


@pytest.mark.asyncio
async def test_download_exactly_10mb(config: AppConfig) -> None:
    """download accepts files exactly at the 10 MB boundary."""
    content = b"x" * (10 * 1024 * 1024)
    client = MagicMock()
    client.download_bytes = AsyncMock(return_value=("edge.bin", content))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["download"](path="/data/edge.bin")

    parsed = json.loads(result)
    assert parsed["size"] == len(content)


# ──────────────────────────────────────────────────────────────────────────
# create_folder
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_create_folder_success(config: AppConfig) -> None:
    """create_folder returns the path of the created folder."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={"folders": [{"isdir": True, "name": "new-app", "path": "/docker/new-app"}]}
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["create_folder"](path="/docker", name="new-app")

    assert result == "Created: /docker/new-app"
    call_params = client.request.call_args[1]["params"]
    assert call_params["folder_path"] == json.dumps("/docker")
    assert call_params["name"] == json.dumps("new-app")
    assert call_params["force_parent"] == "false"


@pytest.mark.asyncio
async def test_create_folder_dsm_error(config: AppConfig) -> None:
    """create_folder returns Error: on SynologyError."""
    client = MagicMock()
    client.request = AsyncMock(side_effect=SynologyError("No write permission", code=1801))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["create_folder"](path="/docker", name="new-app")

    assert result.startswith("Error:")
    assert "permission" in result.lower()


@pytest.mark.asyncio
async def test_create_folder_create_parents(config: AppConfig) -> None:
    """create_folder passes force_parent=true when create_parents=True."""
    client = MagicMock()
    client.request = AsyncMock(return_value={"folders": []})

    tools = _make_mcp_and_tools(config, client)
    await tools["create_folder"](path="/docker/deep/path", name="new-app", create_parents=True)

    call_params = client.request.call_args[1]["params"]
    assert call_params["force_parent"] == "true"


# ──────────────────────────────────────────────────────────────────────────
# rename
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_rename_success(config: AppConfig) -> None:
    """rename returns the new path of the renamed item."""
    client = MagicMock()
    client.request = AsyncMock(
        return_value={"files": [{"isdir": False, "name": "new.yaml", "path": "/docker/new.yaml"}]}
    )

    tools = _make_mcp_and_tools(config, client)
    result = await tools["rename"](path="/docker/old.yaml", new_name="new.yaml")

    assert result == "Renamed to: /docker/new.yaml"
    call_params = client.request.call_args[1]["params"]
    assert call_params["path"] == json.dumps("/docker/old.yaml")
    assert call_params["name"] == json.dumps("new.yaml")


@pytest.mark.asyncio
async def test_rename_dsm_error(config: AppConfig) -> None:
    """rename returns Error: on SynologyError."""
    client = MagicMock()
    client.request = AsyncMock(side_effect=SynologyError("File or folder not found", code=1800))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["rename"](path="/docker/missing.yaml", new_name="new.yaml")

    assert result.startswith("Error:")
    assert "not found" in result.lower()


# ──────────────────────────────────────────────────────────────────────────
# copy
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_copy_success_with_polling(config: AppConfig) -> None:
    """copy polls two rounds then returns the destination path."""
    client = MagicMock()
    poll_calls = 0

    async def _request(api, method, version=None, params=None, **kwargs):
        nonlocal poll_calls
        if method == "start":
            return {"taskid": "FileStation_copy1"}
        if method == "status":
            poll_calls += 1
            finished = poll_calls >= 2
            return {
                "finished": finished,
                "progress": 1.0 if finished else 0.5,
                "dest_folder_path": "/backup/docker",
            }
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["copy"](src="/docker/app/compose.yaml", dst="/backup/docker")

    assert result == "Copied to: /backup/docker/compose.yaml"
    assert poll_calls == 2
    # Verify start used correct params
    start_call = client.request.call_args_list[0]
    assert start_call[0][0] == "SYNO.FileStation.CopyMove"
    assert start_call[0][1] == "start"
    start_params = start_call[1]["params"]
    assert start_params["path"] == json.dumps("/docker/app/compose.yaml")
    assert start_params["dest_folder_path"] == json.dumps("/backup/docker")
    assert start_params["remove_src"] == "false"
    assert start_params["overwrite"] == "false"


@pytest.mark.asyncio
async def test_copy_timeout(config: AppConfig) -> None:
    """copy returns an error message after polling times out."""
    client = MagicMock()

    async def _request(api, method, version=None, params=None, **kwargs):
        if method == "start":
            return {"taskid": "FileStation_copy_timeout"}
        return {"finished": False, "progress": 0.1}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["copy"](src="/docker/big.tar", dst="/backup")

    assert result.startswith("Error:")
    assert "timed out" in result.lower() or "60 seconds" in result


@pytest.mark.asyncio
async def test_copy_dsm_error_on_start(config: AppConfig) -> None:
    """copy returns Error: when the start call fails."""
    client = MagicMock()
    client.request = AsyncMock(side_effect=SynologyError("No write permission", code=1801))

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["copy"](src="/docker/app.yaml", dst="/backup")

    assert result.startswith("Error:")


# ──────────────────────────────────────────────────────────────────────────
# move
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_move_success(config: AppConfig) -> None:
    """move returns destination path and passes remove_src=true."""
    client = MagicMock()

    async def _request(api, method, version=None, params=None, **kwargs):
        if method == "start":
            return {"taskid": "FileStation_move1"}
        return {"finished": True, "dest_folder_path": "/archive/docker"}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["move"](src="/docker/old.yaml", dst="/archive/docker")

    assert result == "Moved to: /archive/docker/old.yaml"
    start_params = client.request.call_args_list[0][1]["params"]
    assert start_params["remove_src"] == "true"
    assert start_params["path"] == json.dumps("/docker/old.yaml")
    assert start_params["dest_folder_path"] == json.dumps("/archive/docker")


@pytest.mark.asyncio
async def test_move_dsm_error(config: AppConfig) -> None:
    """move returns Error: when the start call fails."""
    client = MagicMock()
    client.request = AsyncMock(side_effect=SynologyError("File or folder not found", code=1800))

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["move"](src="/docker/missing.yaml", dst="/backup")

    assert result.startswith("Error:")
    assert "not found" in result.lower()


# ──────────────────────────────────────────────────────────────────────────
# delete
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_delete_preview_no_dsm_call(config: AppConfig) -> None:
    """delete with confirmed=False returns a preview and makes no DSM requests."""
    client = MagicMock()
    client.request = AsyncMock()

    tools = _make_mcp_and_tools(config, client)
    result = await tools["delete"](path="/docker/app", confirmed=False)

    client.request.assert_not_called()
    assert "/docker/app" in result
    assert "confirmed=True" in result


@pytest.mark.asyncio
async def test_delete_confirmed_with_polling(config: AppConfig) -> None:
    """delete with confirmed=True polls until finished and returns success."""
    client = MagicMock()
    poll_calls = 0

    async def _request(api, method, version=None, params=None, **kwargs):
        nonlocal poll_calls
        if method == "start":
            return {"taskid": "FileStation_del1"}
        if method == "status":
            poll_calls += 1
            return {"finished": poll_calls >= 2, "processed_num": poll_calls}
        return {}

    client.request = AsyncMock(side_effect=_request)

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["delete"](path="/docker/old-app", confirmed=True)

    assert result == "Deleted: /docker/old-app"
    start_params = client.request.call_args_list[0][1]["params"]
    assert start_params["path"] == json.dumps("/docker/old-app")
    assert start_params["recursive"] == "true"


@pytest.mark.asyncio
async def test_delete_dsm_error_on_start(config: AppConfig) -> None:
    """delete returns Error: when the start call fails."""
    client = MagicMock()
    client.request = AsyncMock(
        side_effect=SynologyError("Permission denied — check DSM user permissions", code=105)
    )

    tools = _make_mcp_and_tools(config, client)
    with patch("asyncio.sleep", new_callable=AsyncMock):
        result = await tools["delete"](path="/docker/app", confirmed=True)

    assert result.startswith("Error:")
    assert "Permission denied" in result


# ──────────────────────────────────────────────────────────────────────────
# upload
# ──────────────────────────────────────────────────────────────────────────


@pytest.mark.asyncio
async def test_upload_success(config: AppConfig) -> None:
    """upload decodes base64, calls upload_bytes, and returns the full path."""
    import base64 as _b64

    raw = b"version: '3'\nservices:\n  app:\n    image: nginx\n"
    encoded = _b64.b64encode(raw).decode()

    client = MagicMock()
    client.upload_bytes = AsyncMock(return_value={})

    tools = _make_mcp_and_tools(config, client)
    result = await tools["upload"](
        path="/docker/app", filename="compose.yaml", content_base64=encoded
    )

    assert result == "Uploaded: /docker/app/compose.yaml"
    client.upload_bytes.assert_called_once()
    call_kwargs = client.upload_bytes.call_args[1]
    assert call_kwargs["dest_folder"] == "/docker/app"
    assert call_kwargs["filename"] == "compose.yaml"
    assert call_kwargs["content"] == raw
    assert call_kwargs["overwrite"] is False


@pytest.mark.asyncio
async def test_upload_too_large(config: AppConfig) -> None:
    """upload returns Error: when decoded content exceeds 50 MB."""
    import base64 as _b64

    large = _b64.b64encode(b"x" * (50 * 1024 * 1024 + 1)).decode()

    client = MagicMock()
    client.upload_bytes = AsyncMock(return_value={})

    tools = _make_mcp_and_tools(config, client)
    result = await tools["upload"](path="/data", filename="big.bin", content_base64=large)

    assert result.startswith("Error:")
    assert "50 MB" in result or "exceeds" in result
    client.upload_bytes.assert_not_called()


@pytest.mark.asyncio
async def test_upload_create_parents(config: AppConfig) -> None:
    """upload passes create_parents=True to upload_bytes."""
    import base64 as _b64

    client = MagicMock()
    client.upload_bytes = AsyncMock(return_value={})

    tools = _make_mcp_and_tools(config, client)
    await tools["upload"](
        path="/docker/deep/path",
        filename="file.txt",
        content_base64=_b64.b64encode(b"hello").decode(),
        create_parents=True,
    )

    call_kwargs = client.upload_bytes.call_args[1]
    assert call_kwargs["create_parents"] is True


@pytest.mark.asyncio
async def test_upload_invalid_base64(config: AppConfig) -> None:
    """upload returns Error: when content_base64 is not valid base64."""
    client = MagicMock()
    client.upload_bytes = AsyncMock(return_value={})

    tools = _make_mcp_and_tools(config, client)
    result = await tools["upload"](path="/docker", filename="f.txt", content_base64="not-base64!!!")

    assert result.startswith("Error:")
    assert "base64" in result.lower()
    client.upload_bytes.assert_not_called()


@pytest.mark.asyncio
async def test_upload_dsm_error(config: AppConfig) -> None:
    """upload returns Error: on SynologyError from upload_bytes."""
    import base64 as _b64

    client = MagicMock()
    client.upload_bytes = AsyncMock(side_effect=SynologyError("No write permission", code=1801))

    tools = _make_mcp_and_tools(config, client)
    result = await tools["upload"](
        path="/docker",
        filename="compose.yaml",
        content_base64=_b64.b64encode(b"data").decode(),
    )

    assert result.startswith("Error:")
    assert "permission" in result.lower()