import os
import unittest
import yaml
from tempfile import NamedTemporaryFile
from pathlib import Path
from typing import cast
from chatmastermind.configuration import AIConfig, OpenAIConfig, ConfigError, ai_config_instance, Config


class TestAIConfigInstance(unittest.TestCase):
    def test_ai_config_instance_with_valid_name_should_return_instance_with_default_values(self) -> None:
        ai_config = cast(OpenAIConfig, ai_config_instance('openai'))
        ai_reference = OpenAIConfig()
        self.assertEqual(ai_config.ID, ai_reference.ID)
        self.assertEqual(ai_config.name, ai_reference.name)
        self.assertEqual(ai_config.api_key, ai_reference.api_key)
        self.assertEqual(ai_config.system, ai_reference.system)
        self.assertEqual(ai_config.model, ai_reference.model)
        self.assertEqual(ai_config.temperature, ai_reference.temperature)
        self.assertEqual(ai_config.max_tokens, ai_reference.max_tokens)
        self.assertEqual(ai_config.top_p, ai_reference.top_p)
        self.assertEqual(ai_config.frequency_penalty, ai_reference.frequency_penalty)
        self.assertEqual(ai_config.presence_penalty, ai_reference.presence_penalty)

    def test_ai_config_instance_with_valid_name_and_configuration_should_return_instance_with_custom_values(self) -> None:
        conf_dict = {
            'system': 'Custom system',
            'api_key': '9876543210',
            'model': 'custom_model',
            'max_tokens': 5000,
            'temperature': 0.5,
            'top_p': 0.8,
            'frequency_penalty': 0.7,
            'presence_penalty': 0.2
        }
        ai_config = cast(OpenAIConfig, ai_config_instance('openai', conf_dict))
        self.assertEqual(ai_config.system, 'Custom system')
        self.assertEqual(ai_config.api_key, '9876543210')
        self.assertEqual(ai_config.model, 'custom_model')
        self.assertEqual(ai_config.max_tokens, 5000)
        self.assertAlmostEqual(ai_config.temperature, 0.5)
        self.assertAlmostEqual(ai_config.top_p, 0.8)
        self.assertAlmostEqual(ai_config.frequency_penalty, 0.7)
        self.assertAlmostEqual(ai_config.presence_penalty, 0.2)

    def test_ai_config_instance_with_invalid_name_should_raise_config_error(self) -> None:
        with self.assertRaises(ConfigError):
            ai_config_instance('invalid_name')


class TestConfig(unittest.TestCase):
    def setUp(self) -> None:
        self.test_file = NamedTemporaryFile(delete=False)

    def tearDown(self) -> None:
        os.remove(self.test_file.name)

    def test_from_dict_should_create_config_from_dict(self) -> None:
        source_dict = {
            'cache': '.',
            'db': './test_db/',
            'ais': {
                'myopenai': {
                    'name': 'openai',
                    'system': 'Custom system',
                    'api_key': '9876543210',
                    'model': 'custom_model',
                    'max_tokens': 5000,
                    'temperature': 0.5,
                    'top_p': 0.8,
                    'frequency_penalty': 0.7,
                    'presence_penalty': 0.2
                }
            },
            'glossaries': './glossaries/'
        }
        config = Config.from_dict(source_dict)
        self.assertEqual(config.cache, '.')
        self.assertEqual(config.db, './test_db/')
        self.assertEqual(config.glossaries, './glossaries/')
        self.assertEqual(len(config.ais), 1)
        self.assertEqual(config.ais['myopenai'].name, 'openai')
        self.assertEqual(cast(OpenAIConfig, config.ais['myopenai']).system, 'Custom system')
        # check that 'ID' has been added
        self.assertEqual(config.ais['myopenai'].ID, 'myopenai')

    def test_create_default_should_create_default_config(self) -> None:
        Config.create_default(Path(self.test_file.name))
        with open(self.test_file.name, 'r') as f:
            default_config = yaml.load(f, Loader=yaml.FullLoader)
        config_reference = Config()
        self.assertEqual(default_config['db'], config_reference.db)

    def test_from_file_should_load_config_from_file(self) -> None:
        source_dict = {
            'cache': './test_cache/',
            'db': './test_db/',
            'ais': {
                'default': {
                    'name': 'openai',
                    'system': 'Custom system',
                    'api_key': '9876543210',
                    'model': 'custom_model',
                    'max_tokens': 5000,
                    'temperature': 0.5,
                    'top_p': 0.8,
                    'frequency_penalty': 0.7,
                    'presence_penalty': 0.2
                }
                # omit glossaries, since it's optional
            }
        }
        with open(self.test_file.name, 'w') as f:
            yaml.dump(source_dict, f)
        config = Config.from_file(self.test_file.name)
        self.assertIsInstance(config, Config)
        self.assertEqual(config.cache, './test_cache/')
        self.assertEqual(config.db, './test_db/')
        # missing 'glossaries' should result in 'None'
        self.assertEqual(config.glossaries, None)
        self.assertEqual(len(config.ais), 1)
        self.assertIsInstance(config.ais['default'], AIConfig)
        self.assertEqual(cast(OpenAIConfig, config.ais['default']).system, 'Custom system')

    def test_to_file_should_save_config_to_file(self) -> None:
        config = Config(
            cache='./test_cache/',
            db='./test_db/',
            ais={
                'myopenai': OpenAIConfig(
                    ID='myopenai',
                    system='Custom system',
                    api_key='9876543210',
                    model='custom_model',
                    max_tokens=5000,
                    temperature=0.5,
                    top_p=0.8,
                    frequency_penalty=0.7,
                    presence_penalty=0.2
                )
            }
        )
        config.to_file(Path(self.test_file.name))
        with open(self.test_file.name, 'r') as f:
            saved_config = yaml.load(f, Loader=yaml.FullLoader)
        self.assertEqual(saved_config['cache'], './test_cache/')
        self.assertEqual(saved_config['db'], './test_db/')
        self.assertEqual(len(saved_config['ais']), 1)
        self.assertEqual(saved_config['ais']['myopenai']['system'], 'Custom system')

    def test_from_file_error_unknown_ai(self) -> None:
        source_dict = {
            'cache': './test_cache/',
            'db': './test_db/',
            'ais': {
                'default': {
                    'name': 'foobla',
                    'system': 'Custom system',
                    'api_key': '9876543210',
                    'model': 'custom_model',
                    'max_tokens': 5000,
                    'temperature': 0.5,
                    'top_p': 0.8,
                    'frequency_penalty': 0.7,
                    'presence_penalty': 0.2
                }
            }
        }
        with open(self.test_file.name, 'w') as f:
            yaml.dump(source_dict, f)
        with self.assertRaises(ConfigError):
            Config.from_file(self.test_file.name)