#!/usr/bin/env python3
"""Tests for the zensical.toml nav parser.

Run: python3 docs_sp/tools/test_nav_parser.py
"""

import sys
import tempfile
from pathlib import Path

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

from nav_parser import NavEntry, parse, parse_all, _flatten_nav

ZENSICAL_TOML = Path(__file__).resolve().parent.parent.parent / "zensical.toml"


# ---------------------------------------------------------------------------
# Unit tests: _flatten_nav
# ---------------------------------------------------------------------------


def test_flatten_simple_dict():
    nav = [{"Page One": "page-one.md"}]
    result = _flatten_nav(nav)
    assert len(result) == 1
    assert result[0] == NavEntry(title="Page One", path="page-one.md", breadcrumb=("Page One",))
    print("  PASS: flatten_simple_dict")


def test_flatten_nested():
    nav = [
        {"Section": [
            {"Child A": "section/a.md"},
            {"Child B": "section/b.md"},
        ]},
    ]
    result = _flatten_nav(nav)
    assert len(result) == 2
    assert result[0].title == "Child A"
    assert result[0].path == "section/a.md"
    assert result[0].breadcrumb == ("Section", "Child A")
    assert result[1].breadcrumb == ("Section", "Child B")
    print("  PASS: flatten_nested")


def test_flatten_deep_nesting():
    nav = [
        {"L1": [
            {"L2": [
                {"L3": "deep/page.md"},
            ]},
        ]},
    ]
    result = _flatten_nav(nav)
    assert len(result) == 1
    assert result[0].breadcrumb == ("L1", "L2", "L3")
    assert result[0].path == "deep/page.md"
    print("  PASS: flatten_deep_nesting")


def test_flatten_skips_external_links():
    nav = [
        {"Docs": "docs.md"},
        {"Forum": "https://community.sunnypilot.ai"},
    ]
    result = _flatten_nav(nav)
    assert len(result) == 1
    assert result[0].title == "Docs"
    print("  PASS: flatten_skips_external_links")


def test_flatten_bare_string():
    nav = ["getting-started/index.md"]
    result = _flatten_nav(nav)
    assert len(result) == 1
    assert result[0].title == "Index"
    assert result[0].path == "getting-started/index.md"
    print("  PASS: flatten_bare_string")


def test_flatten_mixed():
    nav = [
        {"Home": "index.md"},
        {"Features": [
            "features/index.md",
            {"ICBM": "features/cruise/icbm.md"},
            {"Forum": "https://example.com"},
        ]},
    ]
    result = _flatten_nav(nav)
    assert len(result) == 3  # Home, features/index.md (bare), ICBM
    titles = [e.title for e in result]
    assert "Home" in titles
    assert "ICBM" in titles
    assert "Forum" not in titles
    print("  PASS: flatten_mixed")


# ---------------------------------------------------------------------------
# Unit tests: parse (filters index.md/README.md)
# ---------------------------------------------------------------------------


def test_parse_filters_index():
    """parse() should exclude index.md and README.md entries."""
    toml_content = b"""
[project]
nav = [
    {"Home" = "index.md"},
    {"Guide" = [
        "guide/index.md",
        {"Setup" = "guide/setup.md"},
    ]},
]
"""
    with tempfile.NamedTemporaryFile(suffix=".toml", delete=False) as f:
        f.write(toml_content)
        f.flush()
        result = parse(f.name)

    assert len(result) == 1
    assert result[0].title == "Setup"
    assert result[0].path == "guide/setup.md"
    print("  PASS: parse_filters_index")


def test_parse_all_includes_index():
    """parse_all() should include index.md entries."""
    toml_content = b"""
[project]
nav = [
    {"Home" = "index.md"},
    {"Setup" = "guide/setup.md"},
]
"""
    with tempfile.NamedTemporaryFile(suffix=".toml", delete=False) as f:
        f.write(toml_content)
        f.flush()
        result = parse_all(f.name)

    assert len(result) == 2
    titles = [e.title for e in result]
    assert "Home" in titles
    assert "Setup" in titles
    print("  PASS: parse_all_includes_index")


# ---------------------------------------------------------------------------
# Integration: parse real zensical.toml
# ---------------------------------------------------------------------------


def test_parse_real_zensical():
    """Parse the actual zensical.toml and verify structure."""
    if not ZENSICAL_TOML.exists():
        print("  SKIP: parse_real_zensical (zensical.toml not found)")
        return

    all_entries = parse_all(ZENSICAL_TOML)
    filtered_entries = parse(ZENSICAL_TOML)

    # Sanity checks on totals
    assert len(all_entries) > 50, f"Expected 50+ total entries, got {len(all_entries)}"
    assert len(filtered_entries) > 40, f"Expected 40+ filtered entries, got {len(filtered_entries)}"
    assert len(filtered_entries) < len(all_entries), "Filtering should remove some entries"

    # Every filtered entry should NOT be index.md or README.md
    for entry in filtered_entries:
        assert Path(entry.path).name not in ("index.md", "README.md"), (
            f"Filtered list contains {entry.path}"
        )

    # No external links should be present
    for entry in all_entries:
        assert not entry.path.startswith("http"), f"External link leaked: {entry.path}"

    # Check some known entries exist
    paths = {e.path for e in filtered_entries}
    assert "getting-started/what-is-sunnypilot.md" in paths, "Missing what-is-sunnypilot"
    assert "features/cruise/icbm.md" in paths, "Missing ICBM"
    assert "safety/safety.md" in paths, "Missing safety"

    # Check breadcrumbs are populated
    icbm = next(e for e in filtered_entries if e.path == "features/cruise/icbm.md")
    assert len(icbm.breadcrumb) >= 2, f"ICBM breadcrumb too short: {icbm.breadcrumb}"
    assert "Features" in icbm.breadcrumb or "Cruise Control" in icbm.breadcrumb

    print(f"  PASS: parse_real_zensical ({len(all_entries)} total, {len(filtered_entries)} filtered)")


def test_nav_entry_immutable():
    """NavEntry is frozen — attributes cannot be reassigned."""
    entry = NavEntry(title="Test", path="test.md", breadcrumb=("Test",))
    try:
        entry.title = "Modified"  # type: ignore[misc]
        assert False, "Should have raised FrozenInstanceError"
    except AttributeError:
        pass
    print("  PASS: nav_entry_immutable")


# ---------------------------------------------------------------------------
# Runner
# ---------------------------------------------------------------------------


if __name__ == "__main__":
    print("Testing nav parser:")
    tests = [
        # Unit
        test_flatten_simple_dict,
        test_flatten_nested,
        test_flatten_deep_nesting,
        test_flatten_skips_external_links,
        test_flatten_bare_string,
        test_flatten_mixed,
        test_parse_filters_index,
        test_parse_all_includes_index,
        test_nav_entry_immutable,
        # Integration
        test_parse_real_zensical,
    ]
    passed = 0
    failed = 0
    for test in tests:
        try:
            test()
            passed += 1
        except AssertionError as e:
            print(f"  FAIL: {test.__name__}: {e}")
            failed += 1
        except Exception as e:
            print(f"  ERROR: {test.__name__}: {e}")
            failed += 1

    print(f"\n{passed}/{passed + failed} tests passed")
    sys.exit(1 if failed > 0 else 0)