"""Tests for mempalace.layers — focused on Layer0."""

import os
from unittest.mock import patch

from mempalace.layers import Layer0


# ── Layer0 — with identity file ─────────────────────────────────────────


def test_layer0_reads_identity_file(tmp_path):
    identity_file = tmp_path / "identity.txt"
    identity_file.write_text("I am Atlas, a personal AI assistant for Alice.")
    layer = Layer0(identity_path=str(identity_file))
    text = layer.render()
    assert "Atlas" in text
    assert "Alice" in text


def test_layer0_caches_text(tmp_path):
    identity_file = tmp_path / "identity.txt"
    identity_file.write_text("Hello world")
    layer = Layer0(identity_path=str(identity_file))
    first = layer.render()
    # Modify file after first read
    identity_file.write_text("Changed content")
    second = layer.render()
    # Should return cached version
    assert first == second
    assert second == "Hello world"


def test_layer0_missing_file_returns_default(tmp_path):
    missing = str(tmp_path / "nonexistent.txt")
    layer = Layer0(identity_path=missing)
    text = layer.render()
    assert "No identity configured" in text
    assert "identity.txt" in text


def test_layer0_token_estimate(tmp_path):
    identity_file = tmp_path / "identity.txt"
    content = "A" * 400  # 400 chars ~ 100 tokens
    identity_file.write_text(content)
    layer = Layer0(identity_path=str(identity_file))
    estimate = layer.token_estimate()
    assert estimate == 100


def test_layer0_token_estimate_empty(tmp_path):
    identity_file = tmp_path / "identity.txt"
    identity_file.write_text("")
    layer = Layer0(identity_path=str(identity_file))
    assert layer.token_estimate() == 0


def test_layer0_strips_whitespace(tmp_path):
    identity_file = tmp_path / "identity.txt"
    identity_file.write_text("  Hello world  \n\n")
    layer = Layer0(identity_path=str(identity_file))
    text = layer.render()
    assert text == "Hello world"


def test_layer0_default_path():
    layer = Layer0()
    expected = os.path.expanduser("~/.mempalace/identity.txt")
    assert layer.path == expected


# ── Layer1 — mocked chromadb ────────────────────────────────────────────


def test_layer1_no_palace():
    """Layer1 returns helpful message when no palace exists."""
    with patch("mempalace.layers.MempalaceConfig") as mock_cfg:
        mock_cfg.return_value.palace_path = "/nonexistent/palace"
        from mempalace.layers import Layer1

        layer = Layer1(palace_path="/nonexistent/palace")
    result = layer.generate()
    assert "No palace found" in result or "No memories" in result


# ── Layer2 — mocked chromadb ────────────────────────────────────────────


def test_layer2_no_palace():
    """Layer2 returns message when no palace exists."""
    with patch("mempalace.layers.MempalaceConfig") as mock_cfg:
        mock_cfg.return_value.palace_path = "/nonexistent/palace"
        from mempalace.layers import Layer2

        layer = Layer2(palace_path="/nonexistent/palace")
    result = layer.retrieve(wing="test")
    assert "No palace found" in result


# ── Layer3 — mocked chromadb ────────────────────────────────────────────


def test_layer3_no_palace():
    """Layer3 returns message when no palace exists."""
    with patch("mempalace.layers.MempalaceConfig") as mock_cfg:
        mock_cfg.return_value.palace_path = "/nonexistent/palace"
        from mempalace.layers import Layer3

        layer = Layer3(palace_path="/nonexistent/palace")
    result = layer.search("test query")
    assert "No palace found" in result


def test_layer3_search_raw_no_palace():
    """Layer3.search_raw returns empty list when no palace exists."""
    with patch("mempalace.layers.MempalaceConfig") as mock_cfg:
        mock_cfg.return_value.palace_path = "/nonexistent/palace"
        from mempalace.layers import Layer3

        layer = Layer3(palace_path="/nonexistent/palace")
    result = layer.search_raw("test query")
    assert result == []