import tempfile
import unittest
from contextlib import closing
from pathlib import Path
from types import SimpleNamespace as NS
from unittest.mock import Mock, patch

from libs.grid_take_profit import GridState
from libs.state import State
from sdk import Assets, DealItem, PositionItem, Tick
from strategy.zt import boot
from strategy.zt.positions import manage_positions


class ZTTradingTests(unittest.TestCase):
    def setUp(self):
        self.code = '600000.SH'
        self.run = NS(account_cfg=NS(account_id='test', strategy='zt', buy_value=1000, zt_open_hands=1,
                                    excluded_codes=[], enable_loss_add_position=False,
                                    min_cash_ratio=0.1),
                      orders=Mock(), client=Mock(), profit_tracker=Mock(), add_watch=Mock())
        self.run.orders.busy.return_value = False
        self.run.orders.place.return_value = True
        self.run.profit_tracker.observe.return_value.state = GridState.RETREAT
        self.run.add_watch.triggered.return_value = True

    def manage(self, added=0, usable=500, road=0, cost=10, added_cost=10, price=11):
        position = PositionItem(stock_code=self.code, volume=1000, can_use_volume=usable,
                                on_road_volume=road, open_price=cost)
        state = NS(blocked_codes=set(), get_by_code=lambda code: dict(
            base_qty=500, added_qty=added, added_price=added_cost))
        manage_positions(self.run, {self.code: Tick(last_price=price)}, [position], True, 1500, state)

    def test_added_position_is_capped_by_sellable_inventory(self):
        for added, usable, expected in [(500, 100, 100), (100, 500, 100), (0, 500, 500)]:
            with self.subTest(added=added, usable=usable):
                self.run.orders.place.reset_mock()
                self.manage(added=added, usable=usable)
                self.assertEqual(self.run.orders.place.call_args.args[1].volume, expected)

    def test_zero_sellable_does_not_divide_by_default_added_cost(self):
        with patch('strategy.zt.positions.log.exception') as error:
            self.manage(usable=0, added_cost=0)
        error.assert_not_called()
        self.run.orders.place.assert_not_called()

    def test_unavailable_shares_do_not_disable_loss_management(self):
        self.run.account_cfg.enable_loss_add_position = True
        self.manage(usable=0, cost=20, price=10, added_cost=0)
        self.assertEqual(self.run.orders.place.call_args.args[1].op, 23)

    def test_on_road_shares_do_not_disable_available_base(self):
        self.manage(road=100)
        self.assertEqual(self.run.orders.place.call_args.args[1].volume, 500)

    def test_added_cost_is_used_even_if_base_cost_is_higher(self):
        self.manage(added=100, cost=20, added_cost=10, price=11)
        self.assertEqual(self.run.orders.place.call_args.args[1].volume, 100)

    def test_invalid_selected_cost_never_trades(self):
        for cost in [0, -1, float('nan'), float('inf')]:
            with self.subTest(cost=cost), patch('strategy.zt.positions.log.exception') as error:
                self.manage(added=100, added_cost=cost)
                error.assert_not_called()
        self.run.orders.place.assert_not_called()

    def start(self, client, directory):
        self.run.account_cfg.grid_step_pct = 1
        global_cfg = NS(qmt_base_url='unused', qmt_token='', qmt_data_dir=directory)
        self.run.account_cfg.signal_allow = []
        with patch.object(boot, 'Client', return_value=client), \
             patch.object(boot.config, 'global_config', global_cfg), \
             patch.object(boot.config, 'account_config', self.run.account_cfg), \
             patch.object(boot, 'init_signals', return_value=[]), \
             patch.object(boot, 'cache_portfolio'), patch.object(boot, 'Overview'), \
             patch.object(boot.time, 'localtime', return_value=NS(tm_hour=15, tm_min=0, tm_sec=0)):
            boot.StartZT()

    def test_start_initializes_once_without_snapshot_retry_loop(self):
        client = Mock()
        client.deals.return_value = []
        client.portfolio.return_value = NS(assets=Assets(10000, 10000),
            positions={self.code: PositionItem(stock_code=self.code, volume=100, open_price=10)}, orders=[])
        with tempfile.TemporaryDirectory() as tmp:
            self.start(client, tmp)
            store = State(Path(tmp) / 'zt_test_state.db')
            self.assertEqual(store.state[self.code]['base_qty'], 100)
            with closing(store._connect()) as db:
                self.assertIsNone(db.execute("SELECT 1 FROM sqlite_master WHERE name='state_meta'").fetchone())
            self.assertEqual(client.portfolio.call_count, 1)
            self.assertEqual(client.deals.call_count, 2)
            client.reset_mock()
            self.start(client, tmp)
            self.assertEqual(client.portfolio.call_count, 1)
            self.assertEqual(client.deals.call_count, 1)

    def test_start_rejects_changed_deals_without_writing_baseline(self):
        client = Mock()
        client.deals.side_effect = [[], [DealItem(order_sys_id='new')]]
        client.portfolio.return_value = NS(assets=Assets(10000, 10000), positions={}, orders=[])
        with tempfile.TemporaryDirectory() as tmp:
            with self.assertRaises(RuntimeError):
                self.start(client, tmp)
            store = State(Path(tmp) / 'zt_test_state.db')
            self.assertEqual((store.state, store.deals), ({}, {}))
            client.close.assert_called_once()


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