import unittest

from h8536.emulator import MemoryMap, P9DDR, P9DR
from h8536.emulator.peripherals import P9Bus


class P9BusTest(unittest.TestCase):
    def test_bit7_input_uses_queued_then_default_low_response(self):
        memory = MemoryMap(b"\x00" * 4)
        memory.write8(P9DDR, 0x13)
        memory.write8(P9DR, 0x80)
        memory.p9_bus.queue_input_bits([1])

        self.assertEqual(memory.read8(P9DDR), 0x13)
        self.assertEqual(memory.read8(P9DR) & 0x80, 0x80)
        self.assertEqual(memory.read8(P9DR) & 0x80, 0x00)
        self.assertEqual(memory.registers[P9DR - 0xFE80], 0x80)

    def test_bit7_output_reads_latch(self):
        memory = MemoryMap(b"\x00" * 4)
        memory.write8(P9DDR, 0x93)
        memory.write8(P9DR, 0x80)

        self.assertEqual(memory.read8(P9DDR), 0x93)
        self.assertEqual(memory.read8(P9DR) & 0x80, 0x80)
        self.assertEqual(memory.registers[P9DR - 0xFE80], 0x80)

    def test_strobe_rising_edges_capture_output_bits_and_byte_candidates(self):
        bus = P9Bus()
        bus.write_ddr(0x93)
        for bit in (1, 0, 1, 0, 0, 1, 0, 1):
            bus.write_dr(0x80 if bit else 0x00)
            bus.write_dr((0x80 if bit else 0x00) | 0x02)
            bus.write_dr(0x80 if bit else 0x00)

        self.assertEqual(bus.transmitted_bits, [1, 0, 1, 0, 0, 1, 0, 1])
        self.assertEqual(bus.byte_candidates, [0xA5])
        self.assertEqual([event.edge for event in bus.strobe_edges[:2]], ["rising", "falling"])
        self.assertIn("tx_byte ddr=93 dr=82 value=A5", bus.trace_lines())

    def test_wrapper_results_are_queued_then_default_timeout(self):
        bus = P9Bus()
        bus.queue_wrapper_results([True], source="panel-script")

        self.assertEqual(bus.consume_wrapper_result(), (True, "panel-script", 0))
        self.assertEqual(bus.consume_wrapper_result(), (False, "default_timeout", 0))
        self.assertIn("wrapper_result ddr=00 dr=00 value=01 success=1 source=panel-script queued=0", bus.trace_lines())
        self.assertIn("wrapper_result ddr=00 dr=00 value=00 success=0 source=default_timeout queued=0", bus.trace_lines())


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