"""Tests for app.config — Settings model and environment variable overrides."""

import os
import pytest

from app.config import Settings


def _clear_kmn_env(monkeypatch):
    """Remove all KMTN_ prefixed env vars so Settings reads pure defaults."""
    keys = [k for k in os.environ if k.startswith("KMTN_")]
    for k in keys:
        monkeypatch.delenv(k, raising=False)


class TestSettingsDefaults:
    """Verify Settings defaults match documented behavior."""

    def test_default_database_url(self, monkeypatch):
        _clear_kmn_env(monkeypatch)
        settings = Settings()
        assert "postgresql" in settings.DATABASE_URL
        assert "kmountain" in settings.DATABASE_URL

    def test_default_env_is_development(self, monkeypatch):
        _clear_kmn_env(monkeypatch)
        settings = Settings()
        assert settings.ENV == "development"

    def test_default_jwt_expire_minutes(self, monkeypatch):
        _clear_kmn_env(monkeypatch)
        settings = Settings()
        assert settings.JWT_EXPIRE_MINUTES == 1440

    def test_default_download_token_minutes(self, monkeypatch):
        _clear_kmn_env(monkeypatch)
        settings = Settings()
        assert settings.DOWNLOAD_TOKEN_MINUTES == 10

    def test_default_cors_origins(self, monkeypatch):
        _clear_kmn_env(monkeypatch)
        settings = Settings()
        assert "http://localhost:4200" in settings.CORS_ORIGINS

    def test_empty_admin_credentials_by_default(self, monkeypatch):
        _clear_kmn_env(monkeypatch)
        settings = Settings()
        assert settings.ADMIN_USERNAME == ""
        assert settings.ADMIN_PASSWORD == ""


class TestSettingsEnvOverride:
    """Verify KMTN_ prefixed env vars override defaults."""

    def test_database_url_from_env(self, monkeypatch):
        monkeypatch.setenv("KMTN_DATABASE_URL", "sqlite+aiosqlite:///test.db")
        settings = Settings()
        assert settings.DATABASE_URL == "sqlite+aiosqlite:///test.db"

    def test_env_from_env(self, monkeypatch):
        monkeypatch.setenv("KMTN_ENV", "production")
        settings = Settings()
        assert settings.ENV == "production"

    def test_jwt_secret_from_env(self, monkeypatch):
        monkeypatch.setenv("KMTN_JWT_SECRET_KEY", "my-custom-secret")
        settings = Settings()
        assert settings.JWT_SECRET_KEY == "my-custom-secret"

    def test_jwt_expire_override(self, monkeypatch):
        monkeypatch.setenv("KMTN_JWT_EXPIRE_MINUTES", "60")
        settings = Settings()
        assert settings.JWT_EXPIRE_MINUTES == 60

    def test_logs_dir_override(self, monkeypatch):
        monkeypatch.setenv("KMTN_LOGS_DIR", "/custom/logs")
        settings = Settings()
        assert settings.LOGS_DIR == "/custom/logs"

    def test_geolite2_path_override(self, monkeypatch):
        monkeypatch.setenv("KMTN_GEOLITE2_DB_PATH", "/custom/geo.mmdb")
        settings = Settings()
        assert settings.GEOLITE2_DB_PATH == "/custom/geo.mmdb"

    def test_theme_json_path_override(self, monkeypatch):
        monkeypatch.setenv("KMTN_THEME_JSON_PATH", "/custom/theme.json")
        settings = Settings()
        assert settings.THEME_JSON_PATH == "/custom/theme.json"

    def test_admin_credentials_from_env(self, monkeypatch):
        monkeypatch.setenv("KMTN_ADMIN_USERNAME", "admin")
        monkeypatch.setenv("KMTN_ADMIN_PASSWORD", "secure123")
        settings = Settings()
        assert settings.ADMIN_USERNAME == "admin"
        assert settings.ADMIN_PASSWORD == "secure123"

    def test_website_url_override(self, monkeypatch):
        monkeypatch.setenv("KMTN_WEBSITE_URL", "https://example.com")
        settings = Settings()
        assert settings.WEBSITE_URL == "https://example.com"

    def test_static_upstream_url_override(self, monkeypatch):
        monkeypatch.setenv("KMTN_STATIC_UPSTREAM_URL", "http://frontend:80")
        settings = Settings()
        assert settings.STATIC_UPSTREAM_URL == "http://frontend:80"

    def test_cors_origins_override(self, monkeypatch):
        # pydantic-settings parses JSON lists for list[str] fields
        monkeypatch.setenv("KMTN_CORS_ORIGINS", '["https://example.com"]')
        settings = Settings()
        assert settings.CORS_ORIGINS == ["https://example.com"]

    def test_kmn_prefix_is_required(self, monkeypatch):
        """Non-prefixed env vars should NOT override settings."""
        monkeypatch.setenv("JWT_SECRET_KEY", "should-not-apply")
        settings = Settings()
        assert settings.JWT_SECRET_KEY != "should-not-apply"