from __future__ import annotations

from pathlib import Path

from pdftomd.models import DocumentIdentity
from pdftomd.runtime_contracts import ModelCachePolicy, RuntimeArtifactPaths


def test_model_cache_policy_prefers_explicit_path(tmp_path: Path) -> None:
    policy = ModelCachePolicy.from_environment(
        project_root=tmp_path,
        explicit_model_cache=tmp_path / "explicit-models",
        env={"PDFTOMD_MODEL_CACHE": str(tmp_path / "ignored")},
    )

    assert policy.root == tmp_path / "explicit-models"
    assert policy.marker_dir == tmp_path / "explicit-models" / "marker"
    assert policy.nougat_dir == tmp_path / "explicit-models" / "nougat"
    assert policy.huggingface_home == tmp_path / "explicit-models" / "huggingface"


def test_model_cache_policy_uses_env_then_project_default(tmp_path: Path) -> None:
    env_policy = ModelCachePolicy.from_environment(
        project_root=tmp_path,
        env={"PDFTOMD_MODEL_CACHE": str(tmp_path / "env-models")},
    )
    default_policy = ModelCachePolicy.from_environment(project_root=tmp_path, env={})

    assert env_policy.root == tmp_path / "env-models"
    assert default_policy.root == tmp_path / ".models"


def test_model_cache_policy_exports_offline_environment(tmp_path: Path) -> None:
    policy = ModelCachePolicy.from_environment(project_root=tmp_path, env={})

    environment = policy.to_environment(offline=True)

    assert environment["HF_HOME"] == str(tmp_path / ".models" / "huggingface")
    assert environment["HUGGINGFACE_HUB_CACHE"] == str(tmp_path / ".models" / "huggingface" / "hub")
    assert environment["HF_HUB_OFFLINE"] == "1"


def test_runtime_artifact_paths_are_outside_document_bundle(tmp_path: Path) -> None:
    document = DocumentIdentity.from_path("Example Paper.pdf")
    artifacts = RuntimeArtifactPaths.from_output_root(tmp_path, document)

    assert artifacts.root == tmp_path / ".pdftomd-runtime" / "example-paper"
    assert artifacts.log_file == artifacts.root / "logs" / "conversion.log"
    assert artifacts.resume_state_file == artifacts.root / "state" / "resume-state.json"
    assert "example-paper" in str(artifacts.root)