"""Tests for knowledge_gap_identifier module."""

import sys
import os
import tempfile
import shutil
from pathlib import Path

sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'scripts'))

from knowledge_gap_identifier import KnowledgeGapIdentifier, GapType, GapSeverity


def _make_repo(tmpdir, structure):
    """Create a test repo from a dict of {path: content}."""
    for rel_path, content in structure.items():
        p = Path(tmpdir) / rel_path
        p.parent.mkdir(parents=True, exist_ok=True)
        p.write_text(content)


def test_undocumented_symbol():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/calculator.py": "def add(a, b):\n    return a + b\n",
            "README.md": "# Calculator\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        undocumented = [g for g in report.gaps if g.gap_type == GapType.UNDOCUMENTED]
        assert any(g.name == "add" for g in undocumented), "add should be undocumented"


def test_documented_symbol_no_gap():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/calculator.py": "def add(a, b):\n    return a + b\n",
            "README.md": "# Calculator\nUse `add()` to add numbers.\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        undocumented = [g for g in report.gaps
                       if g.gap_type == GapType.UNDOCUMENTED and g.name == "add"]
        assert len(undocumented) == 0, "add is documented, should not be flagged"


def test_untested_module():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/calculator.py": "def add(a, b):\n    return a + b\n",
            "src/helper.py": "def format(x):\n    return str(x)\n",
            "tests/test_calculator.py": "from src.calculator import add\nassert add(1,2) == 3\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        untested = [g for g in report.gaps if g.gap_type == GapType.UNTESTED]
        assert any("helper" in g.name for g in untested), "helper should be untested"


def test_tested_module_no_gap():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/calculator.py": "def add(a, b):\n    return a + b\n",
            "tests/test_calculator.py": "def test_add():\n    assert True\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        untested = [g for g in report.gaps
                    if g.gap_type == GapType.UNTESTED and "calculator" in g.name]
        assert len(untested) == 0, "calculator has tests, should not be flagged"


def test_missing_implementation():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/app.py": "def run():\n    pass\n",
            "docs/api.md": "# API\nUse `NonExistentClass` to do things.\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        missing = [g for g in report.gaps if g.gap_type == GapType.MISSING_IMPLEMENTATION]
        assert any(g.name == "NonExistentClass" for g in missing)


def test_private_symbols_skipped():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/app.py": "def _internal():\n    pass\ndef public():\n    pass\n",
            "README.md": "# App\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        undocumented_names = [g.name for g in report.gaps if g.gap_type == GapType.UNDOCUMENTED]
        assert "_internal" not in undocumented_names, "Private symbols should be skipped"
        assert "public" in undocumented_names


def test_empty_repo():
    with tempfile.TemporaryDirectory() as tmpdir:
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        assert len(report.gaps) == 0


def test_invalid_path():
    report = KnowledgeGapIdentifier().analyze("/nonexistent/path/xyz")
    assert len(report.gaps) == 1
    assert report.gaps[0].severity == GapSeverity.ERROR


def test_report_summary():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/app.py": "class MyService:\n    def handle(self):\n        pass\n",
            "README.md": "# App\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        summary = report.summary()
        assert "UNDOCUMENTED" in summary
        assert "MyService" in summary


def test_report_to_dict():
    with tempfile.TemporaryDirectory() as tmpdir:
        _make_repo(tmpdir, {
            "src/app.py": "def hello():\n    pass\n",
            "README.md": "# App\n",
        })
        report = KnowledgeGapIdentifier().analyze(tmpdir)
        d = report.to_dict()
        assert "total_gaps" in d
        assert "gaps" in d
        assert isinstance(d["gaps"], list)
        assert d["total_gaps"] > 0


if __name__ == "__main__":
    test_undocumented_symbol()
    test_documented_symbol_no_gap()
    test_untested_module()
    test_tested_module_no_gap()
    test_missing_implementation()
    test_private_symbols_skipped()
    test_empty_repo()
    test_invalid_path()
    test_report_summary()
    test_report_to_dict()
    print("All 10 tests passed.")