"""Unit tests for the ``list_notebook`` tool's pure rendering logic."""

from __future__ import annotations

from deeptutor.tools.list_notebook import (
    MAX_NOTEBOOKS_RENDERED,
    MAX_RECORDS_RENDERED,
    list_notebooks_or_records,
)


class _FakeManager:
    """Minimal NotebookManager stand-in for unit tests."""

    def __init__(self, notebooks=(), records_by_nb=None):
        self._notebooks = list(notebooks)
        self._records = dict(records_by_nb or {})

    def list_notebooks(self):
        return list(self._notebooks)

    def get_records(self, notebook_id):
        return list(self._records.get(notebook_id, []))


# ---------------------------------------------------------------------------
# Index mode (no notebook_id)
# ---------------------------------------------------------------------------


def test_index_returns_empty_message_when_user_has_no_notebooks() -> None:
    outcome = list_notebooks_or_records(notebook_manager=_FakeManager())
    assert outcome.ok is True
    assert "no notebooks" in outcome.text.lower()
    assert outcome.summary == {"mode": "index", "count": 0}


def test_index_renders_id_name_count_for_each_notebook() -> None:
    manager = _FakeManager(
        notebooks=[
            {
                "id": "nb-1",
                "name": "Math",
                "description": "Calculus + linear algebra",
                "record_count": 12,
                "updated_at": 1_700_000_000.0,
            },
            {
                "id": "nb-2",
                "name": "Physics",
                "record_count": 3,
                "updated_at": 1_700_000_010.0,
            },
        ],
    )
    outcome = list_notebooks_or_records(notebook_manager=manager)
    assert outcome.ok is True
    assert "`nb-1`" in outcome.text
    assert "**Math**" in outcome.text
    assert "12 records" in outcome.text
    assert "Calculus + linear algebra" in outcome.text
    assert "`nb-2`" in outcome.text
    assert "Physics" in outcome.text
    assert outcome.summary == {"mode": "index", "count": 2}


def test_index_caps_huge_notebook_lists() -> None:
    manager = _FakeManager(
        notebooks=[
            {"id": f"nb-{i}", "name": f"NB {i}", "record_count": i}
            for i in range(MAX_NOTEBOOKS_RENDERED + 10)
        ],
    )
    outcome = list_notebooks_or_records(notebook_manager=manager)
    assert outcome.ok is True
    assert "showing" in outcome.text.lower()
    assert outcome.summary["count"] == MAX_NOTEBOOKS_RENDERED + 10


# ---------------------------------------------------------------------------
# Drill-down mode (notebook_id given)
# ---------------------------------------------------------------------------


def test_drilldown_rejects_unknown_notebook_id() -> None:
    manager = _FakeManager(
        notebooks=[{"id": "nb-1", "name": "Math"}],
    )
    outcome = list_notebooks_or_records(notebook_id="bogus", notebook_manager=manager)
    assert outcome.ok is False
    assert "Unknown notebook_id" in outcome.error
    assert "`nb-1`" in outcome.error  # tells the LLM the right id to use


def test_drilldown_empty_records() -> None:
    manager = _FakeManager(
        notebooks=[{"id": "nb-1", "name": "Math"}],
        records_by_nb={"nb-1": []},
    )
    outcome = list_notebooks_or_records(notebook_id="nb-1", notebook_manager=manager)
    assert outcome.ok is True
    assert "no records" in outcome.text.lower()
    assert outcome.summary == {"mode": "records", "notebook_id": "nb-1", "count": 0}


def test_drilldown_renders_records_newest_first() -> None:
    manager = _FakeManager(
        notebooks=[{"id": "nb-1", "name": "Math"}],
        records_by_nb={
            "nb-1": [
                {
                    "id": "r-old",
                    "title": "Old",
                    "summary": "old summary",
                    "type": "chat",
                    "created_at": 1_700_000_000.0,
                },
                {
                    "id": "r-new",
                    "title": "New",
                    "summary": "new summary",
                    "type": "chat",
                    "created_at": 1_700_001_000.0,
                },
            ]
        },
    )
    outcome = list_notebooks_or_records(notebook_id="nb-1", notebook_manager=manager)
    assert outcome.ok is True
    # Newest first — "r-new" appears before "r-old" in the rendered text.
    assert outcome.text.index("`r-new`") < outcome.text.index("`r-old`")
    assert "new summary" in outcome.text


def test_drilldown_caps_huge_record_lists() -> None:
    big_records = [
        {"id": f"r-{i}", "title": f"R{i}", "summary": "", "created_at": float(i)}
        for i in range(MAX_RECORDS_RENDERED + 20)
    ]
    manager = _FakeManager(
        notebooks=[{"id": "nb-1", "name": "Math"}],
        records_by_nb={"nb-1": big_records},
    )
    outcome = list_notebooks_or_records(notebook_id="nb-1", notebook_manager=manager)
    assert outcome.ok is True
    assert "showing" in outcome.text.lower()
    assert outcome.summary["count"] == MAX_RECORDS_RENDERED + 20