import json
import os

import pytest

from py import config as config_module


def _normalize(path: str) -> str:
    return os.path.normpath(path).replace(os.sep, "/")


def _setup_paths(monkeypatch: pytest.MonkeyPatch, tmp_path):
    settings_dir = tmp_path / "settings"
    loras_dir = tmp_path / "loras"
    loras_dir.mkdir()
    checkpoint_dir = tmp_path / "checkpoints"
    checkpoint_dir.mkdir()
    embedding_dir = tmp_path / "embeddings"
    embedding_dir.mkdir()

    def fake_get_folder_paths(kind: str):
        mapping = {
            "loras": [str(loras_dir)],
            "checkpoints": [str(checkpoint_dir)],
            "unet": [],
            "embeddings": [str(embedding_dir)],
        }
        return mapping.get(kind, [])

    monkeypatch.setattr(config_module.folder_paths, "get_folder_paths", fake_get_folder_paths)
    monkeypatch.setattr(config_module, "standalone_mode", True)
    monkeypatch.setattr(config_module, "get_settings_dir", lambda create=True: str(settings_dir))

    return loras_dir, settings_dir


def test_symlink_scan_skips_file_links(monkeypatch: pytest.MonkeyPatch, tmp_path):
    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)

    target_dir = loras_dir / "target"
    target_dir.mkdir()
    dir_link = loras_dir / "dir_link"
    dir_link.symlink_to(target_dir, target_is_directory=True)

    file_target = loras_dir / "model.safetensors"
    file_target.write_text("content", encoding="utf-8")
    file_link = loras_dir / "file_link"
    file_link.symlink_to(file_target)

    cfg = config_module.Config()

    normalized_target_dir = _normalize(os.path.realpath(target_dir))
    normalized_link_dir = _normalize(str(dir_link))
    assert cfg._path_mappings[normalized_target_dir] == normalized_link_dir

    normalized_file_real = _normalize(os.path.realpath(file_target))
    assert normalized_file_real not in cfg._path_mappings

    cache_path = settings_dir / "cache" / "symlink_map.json"
    assert cache_path.exists()


def test_symlink_cache_reuses_previous_scan(monkeypatch: pytest.MonkeyPatch, tmp_path):
    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)

    target_dir = loras_dir / "target"
    target_dir.mkdir()
    dir_link = loras_dir / "dir_link"
    dir_link.symlink_to(target_dir, target_is_directory=True)

    first_cfg = config_module.Config()
    cached_mappings = dict(first_cfg._path_mappings)
    cache_path = settings_dir / "cache" / "symlink_map.json"
    assert cache_path.exists()

    def fail_scan(self):
        raise AssertionError("Cache should bypass directory scan")

    monkeypatch.setattr(config_module.Config, "_scan_symbolic_links", fail_scan)

    second_cfg = config_module.Config()
    assert second_cfg._path_mappings == cached_mappings
    assert second_cfg.map_path_to_link(str(target_dir)) == _normalize(str(dir_link))


def test_symlink_cache_survives_noise_mtime(monkeypatch: pytest.MonkeyPatch, tmp_path):
    loras_dir, settings_dir = _setup_paths(monkeypatch, tmp_path)

    target_dir = loras_dir / "target"
    target_dir.mkdir()
    dir_link = loras_dir / "dir_link"
    dir_link.symlink_to(target_dir, target_is_directory=True)

    recipes_dir = loras_dir / "recipes"
    recipes_dir.mkdir()
    noise_file = recipes_dir / "touchme.txt"

    first_cfg = config_module.Config()
    cache_path = settings_dir / "cache" / "symlink_map.json"
    assert cache_path.exists()

    # Update a noisy path to bump parent directory mtime
    noise_file.write_text("hi", encoding="utf-8")

    def fail_scan(self):
        raise AssertionError("Cache should bypass directory scan despite noise mtime")

    monkeypatch.setattr(config_module.Config, "_scan_symbolic_links", fail_scan)

    second_cfg = config_module.Config()
    assert second_cfg.map_path_to_link(str(target_dir)) == _normalize(str(dir_link))


def test_manual_rescan_refreshes_cache(monkeypatch: pytest.MonkeyPatch, tmp_path):
    loras_dir, _ = _setup_paths(monkeypatch, tmp_path)

    target_dir = loras_dir / "target"
    target_dir.mkdir()
    dir_link = loras_dir / "dir_link"
    dir_link.symlink_to(target_dir, target_is_directory=True)

    # Build initial cache pointing at the first target
    first_cfg = config_module.Config()
    old_real = _normalize(os.path.realpath(target_dir))
    assert first_cfg.map_path_to_link(str(target_dir)) == _normalize(str(dir_link))

    # Retarget the symlink to a new directory without touching the cache file
    new_target = loras_dir / "target_v2"
    new_target.mkdir()
    dir_link.unlink()
    dir_link.symlink_to(new_target, target_is_directory=True)

    second_cfg = config_module.Config()

    # Cache still point at the old real path immediately after load
    assert second_cfg.map_path_to_link(str(new_target)) == _normalize(str(new_target))

    # Manual rescan should refresh the mapping to the new target
    second_cfg.rebuild_symlink_cache()
    new_real = _normalize(os.path.realpath(new_target))
    assert second_cfg._path_mappings.get(new_real) == _normalize(str(dir_link))
    assert second_cfg.map_path_to_link(str(new_target)) == _normalize(str(dir_link))


def test_symlink_roots_are_preserved(monkeypatch: pytest.MonkeyPatch, tmp_path):
    settings_dir = tmp_path / "settings"
    real_loras = tmp_path / "loras_real"
    real_loras.mkdir()
    loras_link = tmp_path / "loras_link"
    loras_link.symlink_to(real_loras, target_is_directory=True)

    checkpoints_dir = tmp_path / "checkpoints"
    checkpoints_dir.mkdir()
    embedding_dir = tmp_path / "embeddings"
    embedding_dir.mkdir()

    def fake_get_folder_paths(kind: str):
        mapping = {
            "loras": [str(loras_link)],
            "checkpoints": [str(checkpoints_dir)],
            "unet": [],
            "embeddings": [str(embedding_dir)],
        }
        return mapping.get(kind, [])

    monkeypatch.setattr(config_module.folder_paths, "get_folder_paths", fake_get_folder_paths)
    monkeypatch.setattr(config_module, "standalone_mode", True)
    monkeypatch.setattr(config_module, "get_settings_dir", lambda create=True: str(settings_dir))

    cfg = config_module.Config()

    normalized_real = _normalize(os.path.realpath(real_loras))
    normalized_link = _normalize(str(loras_link))
    assert cfg._path_mappings[normalized_real] == normalized_link

    cache_path = settings_dir / "cache" / "symlink_map.json"
    payload = json.loads(cache_path.read_text(encoding="utf-8"))
    assert payload["path_mappings"][normalized_real] == normalized_link