import os
import sys
import unittest
from pathlib import Path

os.environ.setdefault('QT_QPA_PLATFORM', 'offscreen')
sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
from PyQt6.QtWidgets import QApplication
from app import Monitor
from generated import vkfly

app = QApplication.instance() or QApplication([])


class PowerDisplayTest(unittest.TestCase):
    def setUp(self):
        self.monitor = Monitor()
        self.writer = vkfly.MAVLink(None, srcSystem=1, srcComponent=1)

    def tearDown(self):
        self.monitor.close()

    def deliver(self, message):
        reader = vkfly.MAVLink(None)
        decoded = None
        for byte in message.pack(self.writer):
            result = reader.parse_char(bytes([byte]))
            if result is not None:
                decoded = result
        self.assertIsNotNone(decoded)
        self.monitor.receive(decoded)
        return self.monitor.labels['power'].text()

    def test_sys_status_uses_centivolts(self):
        msg = self.writer.sys_status_encode(0, 0, 0, 0, 2400, 0, 75, 0, 0, 0, 0, 0, 0)
        self.assertEqual(self.deliver(msg), '24.0 V · 剩余 75%')

    def test_sys_status_unknown_voltage_and_remaining(self):
        msg = self.writer.sys_status_encode(0, 0, 0, 0, 65535, 0, -1, 0, 0, 0, 0, 0, 0)
        self.assertEqual(self.deliver(msg), '未知 · 剩余 未知')

    def test_bms_uses_millivolts(self):
        msg = self.writer.vk_bms_status_encode(0, 24000, 0, 0, 80, 1, 0, 0, [0] * 30, 0, 0)
        self.assertEqual(self.deliver(msg), '24.0 V · 剩余 80% · 电池 1')


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