# tests/unit/test_monitor_router.py
"""Tests unitaires pour MonitorRouter (QW1)."""
import pytest

from agent_v0.server_v1.monitor_router import resolve_target_monitor, MonitorTarget


# Geometry de référence pour les 3 tests : 2 écrans côte à côte
TWO_MONITORS = [
    {"idx": 0, "x": 0, "y": 0, "w": 1920, "h": 1080, "primary": True},
    {"idx": 1, "x": 1920, "y": 0, "w": 1920, "h": 1080, "primary": False},
]


def test_resolve_uses_action_monitor_index_when_present():
    """Si action.monitor_index présent et valide → cible cet écran."""
    action = {"monitor_index": 1}
    session_state = {"monitors_geometry": TWO_MONITORS, "last_focused_monitor": 0}
    result = resolve_target_monitor(action, session_state)
    assert result.idx == 1
    assert result.offset_x == 1920
    assert result.offset_y == 0
    assert result.source == "action"


def test_resolve_falls_back_to_focused_monitor_when_action_missing():
    """Si action.monitor_index absent → fallback focus actif."""
    action = {}  # pas de monitor_index
    session_state = {"monitors_geometry": TWO_MONITORS, "last_focused_monitor": 1}
    result = resolve_target_monitor(action, session_state)
    assert result.idx == 1
    assert result.source == "focus"


def test_resolve_falls_back_to_composite_when_geometry_empty():
    """Si geometry vide (vieux Agent V1) → fallback composite (idx=-1, offset=0)."""
    action = {}
    session_state = {"monitors_geometry": [], "last_focused_monitor": None}
    result = resolve_target_monitor(action, session_state)
    assert result.source == "composite_fallback"
    assert result.offset_x == 0
    assert result.offset_y == 0


def test_resolve_falls_back_when_action_index_out_of_range():
    """Si action.monitor_index hors limites (écran débranché) → fallback focus."""
    action = {"monitor_index": 5}  # n'existe pas
    session_state = {"monitors_geometry": TWO_MONITORS, "last_focused_monitor": 0}
    result = resolve_target_monitor(action, session_state)
    assert result.idx == 0
    assert result.source == "focus"