import os
import tempfile

import yaml

from spectra.config import DEFAULT_CONFIG, _deep_merge, load_config


class TestLoadConfig:
    def test_defaults_when_no_file(self):
        cfg = load_config(path="/nonexistent/.spectra/config.yaml")
        assert cfg["display"]["saturation"] == 0.5
        assert cfg["display"]["orientation"] == 0
        assert cfg["unsplash"]["access_key"] == ""
        assert cfg["schedule"]["interval_hours"] == 1

    def test_load_specific_path(self):
        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
            yaml.dump({"display": {"saturation": 0.8}}, f)
            path = f.name
        try:
            cfg = load_config(path)
            assert cfg["display"]["saturation"] == 0.8
            assert cfg["display"]["orientation"] == 0
        finally:
            os.unlink(path)

    def test_missing_path_logs_and_uses_defaults(self):
        cfg = load_config("/nonexistent/path/config.yaml")
        assert cfg["display"]["saturation"] == 0.5

    def test_partial_merge_does_not_remove_other_keys(self):
        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
            yaml.dump({"display": {"saturation": 0.3}}, f)
            path = f.name
        try:
            cfg = load_config(path)
            assert cfg["display"]["saturation"] == 0.3
            assert cfg["display"]["resolution"]["width"] == 1600
            assert cfg["unsplash"]["access_key"] == ""
        finally:
            os.unlink(path)

    def test_empty_file_uses_defaults(self):
        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
            f.write("")
            path = f.name
        try:
            cfg = load_config(path)
            assert cfg["display"]["saturation"] == 0.5
        finally:
            os.unlink(path)

    def test_deep_merge_overrides_nested_key(self):
        base = {"a": {"b": 1, "c": 2}, "d": 3}
        override = {"a": {"b": 99}}
        _deep_merge(base, override)
        assert base["a"]["b"] == 99
        assert base["a"]["c"] == 2
        assert base["d"] == 3

    def test_deep_merge_adds_new_keys(self):
        base = {"a": 1}
        override = {"b": 2}
        _deep_merge(base, override)
        assert base["a"] == 1
        assert base["b"] == 2

    def test_deep_merge_overrides_non_dict_with_dict(self):
        base = {"a": 1}
        override = {"a": {"b": 2}}
        _deep_merge(base, override)
        assert base["a"] == {"b": 2}

    def test_default_config_not_mutated_by_load(self):
        original_sat = DEFAULT_CONFIG["display"]["saturation"]
        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
            yaml.dump({"display": {"saturation": 0.9}}, f)
            path = f.name
        try:
            load_config(path)
            assert DEFAULT_CONFIG["display"]["saturation"] == original_sat
        finally:
            os.unlink(path)

    def test_default_config_not_mutated_by_multiple_loads(self):
        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
            yaml.dump({"unsplash": {"query": "cats"}}, f)
            path1 = f.name
        with tempfile.NamedTemporaryFile(mode="w", suffix=".yaml", delete=False) as f:
            yaml.dump({"unsplash": {"query": "dogs"}}, f)
            path2 = f.name
        try:
            c1 = load_config(path1)
            c2 = load_config(path2)
            assert c1["unsplash"]["query"] == "cats"
            assert c2["unsplash"]["query"] == "dogs"
            assert DEFAULT_CONFIG["unsplash"]["query"] == ""
        finally:
            os.unlink(path1)
            os.unlink(path2)