"""M07 — Config + Docs Extractor. Red/green tests derived from the spec.

Success criteria under test (archive/plan-poc-m01-m23/modules/02-layer-1-extraction-pipeline/m07):
- Parses pyproject/requirements/GitHub Actions/README into ``Node``/``Edge`` lists.
- ``pyproject.toml`` yields a project node plus >=1 dependency node + ``depends_on`` edge.
- ``requirements.txt`` yields one node per real requirement; comments/blank lines skipped.
- ``README.md`` headings yield a document node plus section nodes + ``contains`` edges.
- A GitHub Actions workflow yields a workflow node plus job nodes (parsed via safe_load).
- Malformed TOML / YAML and a missing file degrade gracefully (no raise; empty/partial).
"""

from __future__ import annotations

from pathlib import Path

from loosecanvas.contracts import Edge, Node
from loosecanvas.extractors.config_extractor import (
    extract_github_actions,
    extract_pyproject,
    extract_readme,
    extract_requirements,
)


def test_extract_pyproject_yields_project_and_dependency_nodes(tmp_path: Path) -> None:
    path = tmp_path / "pyproject.toml"
    path.write_text(
        """
[project]
name = "demo-pkg"
version = "1.2.3"
dependencies = [
    "requests>=2.0",
    "pydantic>=2",
]
""",
        encoding="utf-8",
    )

    nodes, edges = extract_pyproject(path)

    assert all(isinstance(n, Node) for n in nodes)
    assert all(isinstance(e, Edge) for e in edges)

    project_nodes = [n for n in nodes if n.kind == "package"]
    assert len(project_nodes) == 1
    assert project_nodes[0].label == "demo-pkg"

    dep_labels = {n.label for n in nodes if n.kind == "dependency"}
    assert "requests>=2.0" in dep_labels
    assert "pydantic>=2" in dep_labels

    assert len(edges) >= 2
    assert all(e.kind == "depends_on" for e in edges)
    assert all(e.source == project_nodes[0].id for e in edges)


def test_extract_requirements_skips_comments_and_blanks(tmp_path: Path) -> None:
    path = tmp_path / "requirements.txt"
    path.write_text(
        """
# top-level comment
requests>=2.0

pydantic==2.5.0  # inline comment
numpy
""",
        encoding="utf-8",
    )

    nodes, edges = extract_requirements(path)

    labels = [n.label for n in nodes]
    kinds = {n.kind for n in nodes}
    assert kinds == {"dependency"}
    assert len(nodes) == 3
    assert "requests>=2.0" in labels
    assert "pydantic==2.5.0" in labels
    assert "numpy" in labels
    assert edges == []


def test_extract_readme_yields_document_and_section_nodes(tmp_path: Path) -> None:
    path = tmp_path / "README.md"
    path.write_text(
        """# Project Title

Intro paragraph.

## Installation

Steps here.

## Usage

More text.
""",
        encoding="utf-8",
    )

    nodes, edges = extract_readme(path)

    doc_nodes = [n for n in nodes if n.kind == "document"]
    assert len(doc_nodes) == 1

    section_labels = [n.label for n in nodes if n.kind == "section"]
    assert "Project Title" in section_labels
    assert "Installation" in section_labels
    assert "Usage" in section_labels

    assert edges
    assert all(e.kind == "contains" for e in edges)
    assert all(e.source == doc_nodes[0].id for e in edges)


def test_extract_github_actions_yields_workflow_and_job_nodes(tmp_path: Path) -> None:
    path = tmp_path / "ci.yml"
    path.write_text(
        """
name: CI
on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - run: echo build
  test:
    runs-on: ubuntu-latest
    steps:
      - run: echo test
""",
        encoding="utf-8",
    )

    nodes, edges = extract_github_actions(path)

    workflow_nodes = [n for n in nodes if n.kind == "workflow"]
    assert len(workflow_nodes) == 1
    assert workflow_nodes[0].label == "CI"

    job_labels = {n.label for n in nodes if n.kind == "job"}
    assert job_labels == {"build", "test"}

    assert len(edges) == 2
    assert all(e.kind == "contains" for e in edges)
    assert all(e.source == workflow_nodes[0].id for e in edges)


def test_malformed_toml_degrades_gracefully(tmp_path: Path) -> None:
    path = tmp_path / "pyproject.toml"
    path.write_text("this is = = not valid toml [[[", encoding="utf-8")

    nodes, edges = extract_pyproject(path)

    assert nodes == []
    assert edges == []


def test_malformed_yaml_degrades_gracefully(tmp_path: Path) -> None:
    path = tmp_path / "ci.yml"
    path.write_text("name: CI\n  bad: : : indentation\n\t- nope", encoding="utf-8")

    nodes, edges = extract_github_actions(path)

    assert nodes == []
    assert edges == []


def test_missing_file_degrades_gracefully(tmp_path: Path) -> None:
    missing = tmp_path / "does_not_exist.toml"

    assert extract_pyproject(missing) == ([], [])
    assert extract_requirements(tmp_path / "missing.txt") == ([], [])
    assert extract_readme(tmp_path / "missing.md") == ([], [])
    assert extract_github_actions(tmp_path / "missing.yml") == ([], [])