import json
import os
import sys
import tempfile
import unittest
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
SRC = ROOT / "src"
if str(SRC) not in sys.path:
    sys.path.insert(0, str(SRC))

from agent_app.revenue_assurance.config import RevenueAssuranceConfig, load_config


class ConfigLoaderTests(unittest.TestCase):
    def test_load_config_prefers_environment_over_file(self) -> None:
        with tempfile.TemporaryDirectory() as tmpdir:
            config_path = Path(tmpdir) / "config.json"
            config_path.write_text(json.dumps({
                "model_endpoint": "https://from-file.example",
                "model_deployment": "from-file-model",
                "api_version": "2024-10-21",
                "api_key": "file-key",
                "use_agentic": False,
            }))

            os.environ["REVENUE_ASSURANCE_CONFIG_PATH"] = str(config_path)
            os.environ["REVENUE_ASSURANCE_MODEL_DEPLOYMENT"] = "from-env-model"
            try:
                config = load_config()
            finally:
                os.environ.pop("REVENUE_ASSURANCE_CONFIG_PATH", None)
                os.environ.pop("REVENUE_ASSURANCE_MODEL_DEPLOYMENT", None)

            self.assertEqual(config.model_endpoint, "https://from-file.example")
            self.assertEqual(config.model_deployment, "from-env-model")
            self.assertFalse(config.use_agentic)

    def test_load_config_returns_defaults_when_no_values_exist(self) -> None:
        config = load_config(config_path=None)
        self.assertIsInstance(config, RevenueAssuranceConfig)
        self.assertEqual(config.api_version, "2024-10-21")

    def test_load_config_disables_agentic_for_placeholder_values(self) -> None:
        with tempfile.TemporaryDirectory() as tmpdir:
            config_path = Path(tmpdir) / "config.json"
            config_path.write_text(json.dumps({
                "model_endpoint": "https://your-foundry-resource.services.ai.azure.com",
                "model_deployment": "gpt-5-6-sol",
                "api_version": "2024-10-21",
                "api_key": "YOUR_API_KEY",
                "use_agentic": True,
            }))

            os.environ["REVENUE_ASSURANCE_CONFIG_PATH"] = str(config_path)
            try:
                config = load_config()
            finally:
                os.environ.pop("REVENUE_ASSURANCE_CONFIG_PATH", None)

            self.assertFalse(config.use_agentic)
            self.assertEqual(config.model_endpoint, "https://your-foundry-resource.services.ai.azure.com")


if __name__ == "__main__":
    unittest.main()