"""
BitgetTradingAPI.get_balance() 单元测试

覆盖场景：
  1. UTA 模式 → privateUtaGetV3AccountAssets（真实路径）
  2. 经典账户模式 → privateMixGetV2MixAccountAccounts
  3. API 异常 → 返回 {}
  4. 空 assets / 无 USDT
  5. get_account_state 端到端解析
"""
import importlib.util
import os
import sys
import types
from pathlib import Path
from unittest.mock import MagicMock

sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))


def load_bitget_sdk_class():
    sdk_path = (
        Path(__file__).resolve().parents[1]
        / 'app' / 'services' / 'bitget_trading_api_sdk.py'
    )

    if 'ccxt' not in sys.modules:
        ccxt_module = types.ModuleType('ccxt')
        ccxt_module.BaseError = Exception
        ccxt_module.bitget = MagicMock()
        sys.modules['ccxt'] = ccxt_module

    if 'app.config' not in sys.modules:
        mock_cfg = types.ModuleType('app.config')
        mock_cfg.get_settings = MagicMock()
        sys.modules['app.config'] = mock_cfg

    if 'app.utils.logger' not in sys.modules:
        mock_log = types.ModuleType('app.utils.logger')
        mock_log.logger = MagicMock()
        sys.modules['app.utils.logger'] = mock_log

    module_name = 'app.services.bitget_trading_api_sdk_bal_test'
    spec = importlib.util.spec_from_file_location(module_name, sdk_path)
    module = importlib.util.module_from_spec(spec)
    sys.modules[module_name] = module
    spec.loader.exec_module(module)
    return module.BitgetTradingAPI


# ──────────────────────────────────────────────
# 测试 1: UTA 模式，正常返回（匹配真实 API）
# ──────────────────────────────────────────────
def test_uta_balance_success():
    """UTA 模式 → privateUtaGetV3AccountAssets 返回 1975.37"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.return_value = {
        'code': '00000',
        'data': {
            'assets': [
                {
                    'coin': 'USDT',
                    'available': '1975.37457492',
                    'locked': '0',
                    'equity': '1975.37457492',
                }
            ],
        },
    }

    balance = api.get_balance()

    assert balance['USDT']['available'] == '1975.37457492'
    assert balance['USDT']['equity'] == '1975.37457492'
    assert balance['USDT']['frozen'] == '0'
    api.exchange.privateUtaGetV3AccountAssets.assert_called_once_with({'coin': 'USDT'})


# ──────────────────────────────────────────────
# 测试 2: UTA 多币种返回
# ──────────────────────────────────────────────
def test_uta_multi_coins():
    """UTA 返回多个币种，正确解析"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.return_value = {
        'code': '00000',
        'data': {
            'assets': [
                {'coin': 'USDT', 'available': '1000.00', 'locked': '200.00', 'equity': '1200.00'},
                {'coin': 'BGB', 'available': '50.00', 'locked': '0', 'equity': '50.00'},
            ],
        },
    }

    balance = api.get_balance()

    assert balance['USDT']['available'] == '1000.00'
    assert balance['USDT']['frozen'] == '200.00'
    assert balance['BGB']['available'] == '50.00'


# ──────────────────────────────────────────────
# 测试 3: 经典合约账户模式
# ──────────────────────────────────────────────
def test_contract_account_balance():
    """经典账户 → privateMixGetV2MixAccountAccounts"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = False

    api.exchange.privateMixGetV2MixAccountAccounts.return_value = {
        'code': '00000',
        'data': [
            {
                'marginCoin': 'USDT',
                'available': '800.50',
                'locked': '100.00',
                'accountEquity': '900.50',
            }
        ],
    }

    balance = api.get_balance()

    assert balance['USDT']['available'] == '800.50'
    assert balance['USDT']['frozen'] == '100.00'
    assert balance['USDT']['equity'] == '900.50'


# ──────────────────────────────────────────────
# 测试 4: API 异常 → 返回 {}
# ──────────────────────────────────────────────
def test_api_exception_returns_empty():
    """API 抛异常 → 返回空字典"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.side_effect = Exception("network error")

    balance = api.get_balance()

    assert balance == {}


# ──────────────────────────────────────────────
# 测试 5: UTA 空 assets → 返回 {}
# ──────────────────────────────────────────────
def test_uta_empty_assets():
    """UTA API 返回空 assets 列表"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.return_value = {
        'code': '00000',
        'data': {'assets': []},
    }

    balance = api.get_balance()

    assert balance == {}


# ──────────────────────────────────────────────
# 测试 6: UTA assets 无 coin 字段 → 跳过
# ──────────────────────────────────────────────
def test_uta_skip_no_coin():
    """assets 中 entry 无 coin → 跳过该条目"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.return_value = {
        'code': '00000',
        'data': {
            'assets': [
                {'coin': '', 'available': '100'},
                {'coin': 'USDT', 'available': '500.00', 'locked': '0', 'equity': '500.00'},
            ],
        },
    }

    balance = api.get_balance()

    assert 'USDT' in balance
    assert balance['USDT']['available'] == '500.00'
    assert len(balance) == 1


# ──────────────────────────────────────────────
# 测试 7: UTA assets 中字段为 None → 解析为 '0'
# ──────────────────────────────────────────────
def test_uta_none_fields():
    """UTA assets 中 available/locked 为 None → 解析为 '0'"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.return_value = {
        'code': '00000',
        'data': {
            'assets': [
                {'coin': 'USDT', 'available': None, 'locked': None, 'equity': None},
            ],
        },
    }

    balance = api.get_balance()

    assert balance['USDT']['available'] == '0'  # _pick_first_value 对 None 返回默认值 '0'


# ──────────────────────────────────────────────
# 测试 8: get_account_state 端到端解析（正常余额）
# ──────────────────────────────────────────────
def test_get_account_state_e2e():
    """get_account_state 正确解析 balance 返回值"""
    balance_return = {
        'USDT': {
            'available': '1975.50',
            'frozen': '24.50',
            'locked': '24.50',
            'equity': '2000.00',
        }
    }

    usdt = balance_return.get('USDT', {})
    available = float(usdt.get('available', 0) or 0)
    frozen = float(usdt.get('frozen', 0) or 0)
    equity = float(usdt.get('equity', 0) or 0)
    account_value = equity if equity > 0 else (available + frozen)

    assert available == 1975.50
    assert frozen == 24.50
    assert equity == 2000.00
    assert account_value == 2000.00


# ──────────────────────────────────────────────
# 测试 9: balance 返回 {} 时 get_account_state 各字段为 0
# ──────────────────────────────────────────────
def test_get_account_state_empty_balance():
    """balance 返回空 → 全部为 0"""
    balance_return = {}

    usdt = balance_return.get('USDT', {})
    available = float(usdt.get('available', 0) or 0)
    frozen = float(usdt.get('frozen', 0) or 0)
    equity = float(usdt.get('equity', 0) or 0)
    account_value = equity if equity > 0 else (available + frozen)

    assert available == 0.0
    assert frozen == 0.0
    assert account_value == 0.0


# ──────────────────────────────────────────────
# 测试 10: UTA 返回 data=None → 返回 {}
# ──────────────────────────────────────────────
def test_uta_data_none():
    """UTA API 返回 data=None"""
    BitgetTradingAPI = load_bitget_sdk_class()
    api = BitgetTradingAPI.__new__(BitgetTradingAPI)
    api.exchange = MagicMock()
    api.use_unified_account = True

    api.exchange.privateUtaGetV3AccountAssets.return_value = {
        'code': '00000',
        'data': None,
    }

    balance = api.get_balance()

    assert balance == {}