"""Tests Maris Hugging Face compatibility layer."""

from __future__ import annotations

import json
import sys
import types
from pathlib import Path

from maris_core.training.hf_compat import (
    MARIS_COMPATIBILITY_ARTIFACT_NAME,
    apply_maris_compatibility_identity,
    maris_hf_compatible_path,
    write_maris_compatibility_artifact,
)


def test_write_maris_compatibility_artifact_sanitizes_loader_fields(tmp_path: Path) -> None:
    output_dir = tmp_path / "model"
    output_dir.mkdir()
    (output_dir / "config.json").write_text(
        json.dumps(
            {
                "_name_or_path": "MarisUK/maris-ai-master",
                "model_type": "qwen2",
                "architectures": ["Qwen2ForCausalLM"],
                "tokenizer_class": "Qwen2TokenizerFast",
                "auto_map": {"AutoModelForCausalLM": "qwen2.modeling_qwen2.Qwen2ForCausalLM"},
            }
        ),
        encoding="utf-8",
    )
    (output_dir / "tokenizer_config.json").write_text(
        json.dumps({"tokenizer_class": "Qwen2TokenizerFast"}),
        encoding="utf-8",
    )
    (output_dir / "adapter_config.json").write_text(
        json.dumps(
            {
                "base_model_class": "Qwen2ForCausalLM",
                "parent_library": "transformers.models.qwen2.modeling_qwen2",
            }
        ),
        encoding="utf-8",
    )

    write_maris_compatibility_artifact(output_dir, maris_model_id="MarisUK/maris-ai-master")
    apply_maris_compatibility_identity(output_dir)

    manifest = json.loads(
        (output_dir / MARIS_COMPATIBILITY_ARTIFACT_NAME).read_text(encoding="utf-8")
    )
    config_payload = json.loads((output_dir / "config.json").read_text(encoding="utf-8"))
    tokenizer_payload = json.loads(
        (output_dir / "tokenizer_config.json").read_text(encoding="utf-8")
    )
    adapter_payload = json.loads((output_dir / "adapter_config.json").read_text(encoding="utf-8"))

    assert manifest["artifact_type"] == "maris-hf-compatibility"
    assert sorted(manifest["artifacts"]) == [
        "adapter_config.json",
        "config.json",
        "tokenizer_config.json",
    ]
    assert config_payload["model_type"] == "maris"
    assert config_payload["architectures"] == ["MarisCompatibleCausalLM"]
    assert tokenizer_payload["tokenizer_class"] == "MarisCompatibleTokenizer"
    assert adapter_payload["base_model_class"] == "MarisCompatibleCausalLM"
    assert adapter_payload["parent_library"] == "maris.compat"


def test_maris_hf_compatible_path_restores_remote_snapshot(monkeypatch, tmp_path: Path) -> None:
    snapshot_dir = tmp_path / "snapshot"
    snapshot_dir.mkdir()
    (snapshot_dir / "config.json").write_text(
        json.dumps(
            {
                "_name_or_path": "MarisUK/maris-ai-master",
                "model_type": "qwen2",
                "architectures": ["Qwen2ForCausalLM"],
            }
        ),
        encoding="utf-8",
    )
    write_maris_compatibility_artifact(snapshot_dir, maris_model_id="MarisUK/maris-ai-master")
    apply_maris_compatibility_identity(snapshot_dir)

    monkeypatch.setitem(
        sys.modules,
        "huggingface_hub",
        types.SimpleNamespace(
            snapshot_download=lambda **kwargs: (
                str(snapshot_dir)
                if kwargs["repo_id"] == "MarisUK/maris-ai-master" and kwargs["repo_type"] == "model"
                else None
            )
        ),
    )
    monkeypatch.setenv("MARIS_HF_COMPAT_ALLOW_REMOTE_SNAPSHOT", "true")

    with maris_hf_compatible_path("MarisUK/maris-ai-master") as compatible_path:
        restored_dir = Path(compatible_path)
        assert restored_dir != snapshot_dir
        restored_config = json.loads(
            restored_dir.joinpath("config.json").read_text(encoding="utf-8")
        )
        assert restored_config["model_type"] == "qwen2"
        assert restored_config["architectures"] == ["Qwen2ForCausalLM"]

    original_config = json.loads((snapshot_dir / "config.json").read_text(encoding="utf-8"))
    assert original_config["model_type"] == "maris"


def test_maris_hf_compatible_path_can_force_remote_snapshot_restore(
    monkeypatch, tmp_path: Path
) -> None:
    snapshot_dir = tmp_path / "snapshot"
    snapshot_dir.mkdir()
    (snapshot_dir / "config.json").write_text(
        json.dumps(
            {
                "_name_or_path": "MarisUK/maris-ai-master",
                "model_type": "qwen2",
                "architectures": ["Qwen2ForCausalLM"],
            }
        ),
        encoding="utf-8",
    )
    write_maris_compatibility_artifact(snapshot_dir, maris_model_id="MarisUK/maris-ai-master")
    apply_maris_compatibility_identity(snapshot_dir)

    monkeypatch.setitem(
        sys.modules,
        "huggingface_hub",
        types.SimpleNamespace(
            snapshot_download=lambda **kwargs: (
                str(snapshot_dir)
                if kwargs["repo_id"] == "MarisUK/maris-ai-master" and kwargs["repo_type"] == "model"
                else None
            )
        ),
    )

    with maris_hf_compatible_path(
        "MarisUK/maris-ai-master", allow_remote_snapshot=True
    ) as compatible_path:
        restored_dir = Path(compatible_path)
        restored_config = json.loads(
            restored_dir.joinpath("config.json").read_text(encoding="utf-8")
        )
        assert restored_config["model_type"] == "qwen2"
        assert restored_config["architectures"] == ["Qwen2ForCausalLM"]


def test_maris_hf_compatible_path_restores_custom_runtime_snapshot(
    monkeypatch, tmp_path: Path
) -> None:
    snapshot_dir = tmp_path / "custom-runtime"
    snapshot_dir.mkdir()
    (snapshot_dir / "config.json").write_text(
        json.dumps(
            {
                "_name_or_path": "custom-user/maris-runtime",
                "model_type": "llama",
                "architectures": ["LlamaForCausalLM"],
            }
        ),
        encoding="utf-8",
    )
    write_maris_compatibility_artifact(snapshot_dir, maris_model_id="custom-user/maris-runtime")
    apply_maris_compatibility_identity(snapshot_dir)

    monkeypatch.setitem(
        sys.modules,
        "huggingface_hub",
        types.SimpleNamespace(
            snapshot_download=lambda **kwargs: (
                str(snapshot_dir)
                if kwargs["repo_id"] == "custom-user/maris-runtime"
                and kwargs["repo_type"] == "model"
                else None
            )
        ),
    )
    monkeypatch.setenv("MARIS_RUNTIME_COMPAT_ALLOW_REMOTE_SNAPSHOT", "true")

    with maris_hf_compatible_path("custom-user/maris-runtime") as compatible_path:
        restored_dir = Path(compatible_path)
        restored_config = json.loads(
            restored_dir.joinpath("config.json").read_text(encoding="utf-8")
        )
        assert restored_config["model_type"] == "llama"
        assert restored_config["architectures"] == ["LlamaForCausalLM"]


def test_maris_hf_compatible_path_returns_remote_snapshot_path_without_restore_artifact(
    monkeypatch,
    tmp_path: Path,
) -> None:
    snapshot_dir = tmp_path / "plain-runtime"
    snapshot_dir.mkdir()
    (snapshot_dir / "config.json").write_text(json.dumps({"model_type": "llama"}), encoding="utf-8")

    monkeypatch.setitem(
        sys.modules,
        "huggingface_hub",
        types.SimpleNamespace(
            snapshot_download=lambda **kwargs: (
                str(snapshot_dir)
                if kwargs["repo_id"] == "custom-user/plain-runtime"
                and kwargs["repo_type"] == "model"
                else None
            )
        ),
    )
    monkeypatch.setenv("MARIS_RUNTIME_COMPAT_ALLOW_REMOTE_SNAPSHOT", "true")

    with maris_hf_compatible_path("custom-user/plain-runtime") as compatible_path:
        assert compatible_path == str(snapshot_dir)