import json
import pytest
from utils import metadata
import yaml


def test_load_metadata_file_yaml(tmp_path):
    data = {'a': 1, 'b': 'test'}
    yaml_path = tmp_path / 'meta.yaml'
    yaml_path.write_text(yaml.dump(data))
    result = metadata.load_metadata_file(yaml_path)
    assert result == data


def test_load_metadata_file_json(tmp_path):
    data = {'x': 42, 'y': 'hello'}
    json_path = tmp_path / 'meta.json'
    json_path.write_text(json.dumps(data))
    result = metadata.load_metadata_file(json_path)
    assert result == data


def test_load_metadata_file_missing(tmp_path):
    missing_path = tmp_path / 'nope.yaml'
    result = metadata.load_metadata_file(missing_path)
    assert result == {}


def test_load_metadata_file_yml_extension(tmp_path):
    data = {'test': 'yml_format'}
    yml_path = tmp_path / 'meta.yml'
    yml_path.write_text(yaml.dump(data))
    result = metadata.load_metadata_file(yml_path)
    assert result == data


def test_load_metadata_file_unknown_format(tmp_path):
    txt_path = tmp_path / 'meta.txt'
    txt_path.write_text('some text')
    result = metadata.load_metadata_file(txt_path)
    assert result == {}


def test_load_metadata_file_malformed_yaml(tmp_path):
    yaml_path = tmp_path / 'bad.yaml'
    yaml_path.write_text('invalid: yaml: content: [')
    with pytest.raises(yaml.YAMLError):
        metadata.load_metadata_file(yaml_path)


def test_load_metadata_file_malformed_json(tmp_path):
    json_path = tmp_path / 'bad.json'
    json_path.write_text('{"invalid": json}')
    with pytest.raises(json.JSONDecodeError):
        metadata.load_metadata_file(json_path)


def test_load_folder_metadata_yaml(tmp_path):
    data = {'folder': 'metadata'}
    metadata_path = tmp_path / 'metadata.yaml'
    metadata_path.write_text(yaml.dump(data))
    result = metadata.load_folder_metadata(tmp_path)
    assert result == data


def test_load_folder_metadata_yml(tmp_path):
    data = {'folder': 'metadata_yml'}
    metadata_path = tmp_path / 'metadata.yml'
    metadata_path.write_text(yaml.dump(data))
    result = metadata.load_folder_metadata(tmp_path)
    assert result == data


def test_load_folder_metadata_json(tmp_path):
    data = {'folder': 'metadata_json'}
    metadata_path = tmp_path / 'metadata.json'
    metadata_path.write_text(json.dumps(data))
    result = metadata.load_folder_metadata(tmp_path)
    assert result == data


def test_load_folder_metadata_missing(tmp_path):
    result = metadata.load_folder_metadata(tmp_path)
    assert result == {}


def test_get_metadata_file_path_existing_yaml(tmp_path):
    metadata_path = tmp_path / 'metadata.yaml'
    metadata_path.write_text('test: data')
    result = metadata.get_metadata_file_path(tmp_path)
    assert result == str(metadata_path)


def test_get_metadata_file_path_existing_yml(tmp_path):
    metadata_path = tmp_path / 'metadata.yml'
    metadata_path.write_text('test: data')
    result = metadata.get_metadata_file_path(tmp_path)
    assert result == str(metadata_path)


def test_get_metadata_file_path_existing_json(tmp_path):
    metadata_path = tmp_path / 'metadata.json'
    metadata_path.write_text('{"test": "data"}')
    result = metadata.get_metadata_file_path(tmp_path)
    assert result == str(metadata_path)


def test_get_metadata_file_path_none_existing(tmp_path):
    result = metadata.get_metadata_file_path(tmp_path)
    expected = str(tmp_path / 'metadata.yaml')
    assert result == expected


def test_merge_metadata():
    parent = {'project': 'Test', 'version': '1.0', 'author': 'Parent'}
    child = {'experiment': 'A', 'version': '1.1'}
    merged = metadata.merge_metadata(parent, child)
    expected = {'project': 'Test', 'version': '1.1',
                'author': 'Parent', 'experiment': 'A'}
    assert merged == expected


def test_merge_metadata_empty_parent():
    parent = {}
    child = {'experiment': 'A', 'version': '1.1'}
    merged = metadata.merge_metadata(parent, child)
    assert merged == child


def test_merge_metadata_empty_child():
    parent = {'project': 'Test', 'version': '1.0'}
    child = {}
    merged = metadata.merge_metadata(parent, child)
    assert merged == parent


def test_resolve_metadata_for_plot_with_specific_yaml(tmp_path):
    # Create plot-specific metadata file
    plot_path = tmp_path / 'test_plot.pdf'
    plot_metadata_path = tmp_path / 'test_plot.yaml'
    plot_metadata = {'specific': 'plot_data', 'override': 'plot_value'}
    plot_metadata_path.write_text(yaml.dump(plot_metadata))

    inherited = {'general': 'data', 'override': 'inherited_value'}
    result = metadata.resolve_metadata_for_plot(plot_path, inherited)

    expected = {'general': 'data',
                'override': 'plot_value', 'specific': 'plot_data'}
    assert result == expected


def test_resolve_metadata_for_plot_with_specific_json(tmp_path):
    plot_path = tmp_path / 'test_plot.pdf'
    plot_metadata_path = tmp_path / 'test_plot.json'
    plot_metadata = {'specific': 'plot_data_json'}
    plot_metadata_path.write_text(json.dumps(plot_metadata))

    inherited = {'general': 'data'}
    result = metadata.resolve_metadata_for_plot(plot_path, inherited)

    expected = {'general': 'data', 'specific': 'plot_data_json'}
    assert result == expected


def test_resolve_metadata_for_plot_no_specific(tmp_path):
    plot_path = tmp_path / 'test_plot.pdf'
    inherited = {'general': 'data', 'inherited': 'value'}
    result = metadata.resolve_metadata_for_plot(plot_path, inherited)

    # Should return copy of inherited metadata
    assert result == inherited
    assert result is not inherited  # Should be a copy


def test_save_metadata_cache(tmp_path):
    cache_data = {
        'plot1': {'title': 'Plot 1', 'author': 'Test'},
        'plot2': {'title': 'Plot 2', 'experiment': 'B'}
    }

    metadata.save_metadata_cache(tmp_path, cache_data)

    cache_file = tmp_path / 'meta_cache.json'
    assert cache_file.exists()

    with cache_file.open('r') as f:
        loaded_data = json.load(f)

    assert loaded_data == cache_data


def test_save_metadata_cache_empty(tmp_path):
    cache_data = {}
    metadata.save_metadata_cache(tmp_path, cache_data)

    cache_file = tmp_path / 'meta_cache.json'
    assert cache_file.exists()

    with cache_file.open('r') as f:
        loaded_data = json.load(f)

    assert loaded_data == {}