import pytest
from .registry import instances
import sys
import os
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
from slic.utils.marker import *


# Dummy class to simulate an adjustable device 
class DummyDevice:
    def __init__(self, name="Device", units="V", current=1.23):
        self.name = name
        self.units = units
        self.current = current
        self.set_calls = []

    def get_current_value(self):
        return self.current

    def set_target_value(self, value, hold=False):
        self.set_calls.append((value, hold))
        self.current = value
        return f"Set to {value}{self.units}, hold={hold}"


# Test format_value()
def test_format_value_with_units():
    assert format_value(1.5, "V") == "1.5 V"

def test_format_value_without_units():
    assert format_value(1.5, None) == "1.5"


# Marker class tests

def test_marker_name_default():
    device = DummyDevice()
    m = Marker(device, value=2.5)
    assert m.name == "Device at 2.5 V"

def test_marker_name_custom():
    device = DummyDevice()
    m = Marker(device, value=2.5, name="TestName")
    assert m.name == "TestName"

def test_marker_repr_format():
    device = DummyDevice(name="Volt", units="mV", current=1.0)
    m = Marker(device, value=2.5)
    out = repr(m)
    assert 'Marker "Volt at 2.5 mV"' in out
    assert "(currently at 1.0 mV)" in out

def test_marker_update_changes_value():
    device = DummyDevice(current=4.2)
    m = Marker(device, value=1.0)
    assert m.value == 1.0
    m.update()
    assert m.value == 4.2

def test_marker_update_with_explicit_value():
    device = DummyDevice()
    m = Marker(device, value=0.0)
    m.update(7.7)
    assert m.value == 7.7

def test_marker_goto_sets_value_and_returns_result():
    device = DummyDevice(current=1.0)
    m = Marker(device, value=3.3)
    result = m.goto()
    assert result == "Set to 3.3V, hold=False"
    assert device.current == 3.3
    assert device.set_calls[-1] == (3.3, False)

def test_marker_call_is_alias_of_goto():
    device = DummyDevice(current=1.0)
    m = Marker(device, value=3.3)
    result = m(hold=True)
    assert result == "Set to 3.3V, hold=True"
    assert device.set_calls[-1] == (3.3, True)


# markers singleton registry

# Clean singleton before test session
@pytest.fixture(autouse=True)
def clean_markers_registry():
    # Ensures markers are reset before each test
    Marker._registry.clear()
    yield
    Marker._registry.clear()

def test_markers_register_and_access():
    d1 = DummyDevice(name="Dev1", current=1.0)
    d2 = DummyDevice(name="Dev2", current=2.0)
    m1 = Marker(d1, value=10)
    m2 = Marker(d2, value=20)

    all_markers = markers._get()

    assert isinstance(all_markers, dict)
    assert m1.name in all_markers
    assert m2.name in all_markers
    assert all_markers[m1.name] is m1
    assert all_markers[m2.name] is m2
    assert markers[m1.name] is m1
    assert markers[m2.name] is m2

def test_markers_repr_contains_all():
    d1 = DummyDevice(name="Dev1", current=1.0)
    d2 = DummyDevice(name="Dev2", current=2.0)
    m1 = Marker(d1, value=10)
    m2 = Marker(d2, value=20)

    repr_str = repr(markers)
    assert "Dev1 at 10 V" in repr_str
    assert "Dev2 at 20 V" in repr_str
    assert isinstance(repr_str, str)

def test_markers_conflicting_names():
    d = DummyDevice(name="DevX", current=5.0)
    m1 = Marker(d, value=50, name="conflict")
    m2 = Marker(d, value=60, name="conflict")  # same name => overwrite

    all_markers = markers._get()
    assert "conflict" in all_markers
    assert all_markers["conflict"] is m2  # The last one wins

def test_marker_registry_dict_is_printable_dict():
    d = DummyDevice(name="DevP", current=7.0)
    m = Marker(d, value=70)
    ms = markers._get()
    assert isinstance(ms, dict)
    assert isinstance(repr(markers), str)
    assert isinstance(printable_dict(ms), str)

def test_markers_getitem_invalid_key_raises():
    with pytest.raises(KeyError):
        _ = markers["this marker does not exist"]