"""Tests for myagents.claude_settings."""

import json
from pathlib import Path

import pytest

from myagents import claude_settings as cs_mod
from myagents.backends import get_provider


@pytest.fixture()
def fake_settings_path(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
    path = tmp_path / ".claude" / "settings.json"
    monkeypatch.setattr(cs_mod, "_settings_path", lambda: path)
    return path


class TestLoadSaveSettings:
    def test_load_missing_returns_empty(self, fake_settings_path: Path) -> None:
        assert cs_mod.load_settings() == {}

    def test_save_and_load_roundtrip(self, fake_settings_path: Path) -> None:
        cs_mod.save_settings({"effortLevel": "medium"})
        assert cs_mod.load_settings()["effortLevel"] == "medium"

    def test_load_corrupt_returns_empty(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text("{not json")
        assert cs_mod.load_settings() == {}


class TestApplyProvider:
    def test_applies_deepseek_env(self, fake_settings_path: Path) -> None:
        settings = cs_mod.apply_provider(get_provider("deepseek"), key="sk-test")
        env = settings["env"]
        assert env["ANTHROPIC_AUTH_TOKEN"] == "sk-test"
        assert env["ANTHROPIC_BASE_URL"] == "https://api.deepseek.com/anthropic"
        assert env["ANTHROPIC_MODEL"] == "deepseek-v4-pro"
        assert env["ANTHROPIC_DEFAULT_FABLE_MODEL"] == "deepseek-v4-pro"

    def test_model_override(self, fake_settings_path: Path) -> None:
        settings = cs_mod.apply_provider(
            get_provider("kimi"), key="sk-test", model="kimi-k2.5"
        )
        assert settings["env"]["ANTHROPIC_MODEL"] == "kimi-k2.5"

    def test_base_url_override(self, fake_settings_path: Path) -> None:
        settings = cs_mod.apply_provider(
            get_provider("kimi"), key="sk-test", base_url="https://api.moonshot.cn/anthropic"
        )
        assert settings["env"]["ANTHROPIC_BASE_URL"] == "https://api.moonshot.cn/anthropic"

    def test_preserves_unrelated_env(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text(
            json.dumps({"env": {"DISABLE_AUTOUPDATER": "1", "CUSTOM_VAR": "keep"}})
        )
        settings = cs_mod.apply_provider(get_provider("deepseek"), key="sk-test")
        env = settings["env"]
        assert env["DISABLE_AUTOUPDATER"] == "1"
        assert env["CUSTOM_VAR"] == "keep"
        assert env["ANTHROPIC_AUTH_TOKEN"] == "sk-test"

    def test_removes_stale_managed_vars(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text(
            json.dumps(
                {
                    "env": {
                        "ANTHROPIC_API_KEY": "old-key",
                        "ANTHROPIC_BASE_URL": "https://old.example.com",
                        "ANTHROPIC_MODEL": "old-model",
                        "ANTHROPIC_DEFAULT_OPUS_MODEL": "old-model",
                    }
                }
            )
        )
        settings = cs_mod.apply_provider(get_provider("kimi"), key="sk-test")
        env = settings["env"]
        assert "ANTHROPIC_API_KEY" not in env
        assert env["ANTHROPIC_BASE_URL"] == "https://api.moonshot.ai/anthropic"
        assert env["ANTHROPIC_MODEL"] == "kimi-k2.6"

    def test_claude_provider_clears_third_party_env(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text(
            json.dumps(
                {
                    "env": {
                        "ANTHROPIC_AUTH_TOKEN": "sk-test",
                        "ANTHROPIC_BASE_URL": "https://api.deepseek.com/anthropic",
                        "ANTHROPIC_MODEL": "deepseek-v4-pro",
                    }
                }
            )
        )
        settings = cs_mod.apply_provider(get_provider("claude"))
        assert "env" not in settings

    def test_claude_provider_preserves_user_api_key(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text(json.dumps({"env": {"ANTHROPIC_API_KEY": "sk-ant"}}))
        settings = cs_mod.apply_provider(get_provider("claude"))
        assert settings["env"]["ANTHROPIC_API_KEY"] == "sk-ant"

    def test_missing_key_raises(self, fake_settings_path: Path) -> None:
        with pytest.raises(ValueError, match="API key required"):
            cs_mod.apply_provider(get_provider("deepseek"))


class TestDetectActiveProvider:
    def test_detects_from_global_env(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text(
            json.dumps({"env": {"ANTHROPIC_BASE_URL": "https://api.kimi.com/coding"}})
        )
        provider = cs_mod.get_active_provider()
        assert provider is not None
        assert provider.id == "kimi-code"


class TestDescribeActiveBackend:
    def test_describes_kimi_code(self, fake_settings_path: Path) -> None:
        fake_settings_path.parent.mkdir(parents=True)
        fake_settings_path.write_text(
            json.dumps(
                {
                    "env": {
                        "ANTHROPIC_BASE_URL": "https://api.kimi.com/coding",
                        "ANTHROPIC_MODEL": "kimi-for-coding",
                    }
                }
            )
        )
        assert "Kimi Code" in cs_mod.describe_active_backend()

    def test_describes_default_when_unset(self, fake_settings_path: Path) -> None:
        assert cs_mod.describe_active_backend() == "Claude (default / not configured)"