"""P4-M5: L0 pre-screening promoted to shared core (single implementation).

Run:  python scripts/test_p4_m5_l0.py   (exit 0 = PASS)

Verifies:
  1. The single implementation lives at src/afmcore/l0/prescreening.py.
  2. The web re-export references the same classes (no drift).
  3. Core behavior is unchanged: geometric/electrical/thermal/manufacturing
     checks, evaluate(), filter_feasible(), empty-input gate.
  4. Consumers (feasibility_search) still work through the re-export.
"""
import os
import sys

_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
_BACKEND = os.path.join(_ROOT, "web", "backend")
sys.path.insert(0, _BACKEND)
sys.path.insert(0, _ROOT)

from src.afmcore.l0.prescreening import (  # noqa: E402
    L0PreScreeningEngine as SrcEngine,
    FeasibilityReport, ConstraintResult,
)
from app.services.l0_prescreening import L0PreScreeningEngine as WebEngine  # noqa: E402

# 1) single definition, no drift
assert SrcEngine is WebEngine, "re-export must point at the same class"
assert SrcEngine.__module__ == "src.afmcore.l0.prescreening"
print("[1] single implementation in shared core OK (%s)" % SrcEngine.__module__)

eng = SrcEngine()

# 2) geometric: valid vs invalid diameter ratio
r = eng.evaluate({"outer_diameter_mm": 150, "inner_diameter_mm": 80})
assert r.feasible
r_bad = eng.evaluate({"outer_diameter_mm": 150, "inner_diameter_mm": 10})
assert not r_bad.feasible  # ratio 0.067 < 0.2
print("[2] geometric diameter-ratio gate OK")

# 3) electrical: current density limit
r = eng.evaluate({"current_a": 10, "conductor_area_mm2": 2.0})  # 5 A/mm2
assert r.feasible
r2 = eng.evaluate({"current_a": 100, "conductor_area_mm2": 2.0})  # 50 A/mm2
assert not r2.feasible
print("[3] electrical current-density gate OK")

# 4) thermal: winding temp limit
r = eng.evaluate({"winding_temp_c": 120})   # below 150
assert r.feasible
r2 = eng.evaluate({"winding_temp_c": 160})  # above 150
assert not r2.feasible
print("[4] thermal winding-temp gate OK")

# 5) manufacturing: PCB line width
r = eng.evaluate({"pcb_line_width_mm": 0.5})
assert r.feasible
r2 = eng.evaluate({"pcb_line_width_mm": 0.05})
assert not r2.feasible
print("[5] manufacturing PCB line-width gate OK")

# 6) empty input -> infeasible with UNKNOWN risk item (C3 gate)
r = eng.evaluate({})
assert not r.feasible
assert any("[UNKNOWN]" in x for x in r.risk_items)
print("[6] empty-input gate OK")

# 7) filter_feasible splits sets
sets = [
    {"outer_diameter_mm": 150, "inner_diameter_mm": 80},
    {"outer_diameter_mm": 150, "inner_diameter_mm": 10},
]
feas, infeas = eng.filter_feasible(sets)
assert len(feas) == 1 and len(infeas) == 1
print("[7] filter_feasible split OK")

# 8) consumers still work through the re-export
from app.services.feasibility_search import (  # noqa: E402
    FeasibilityFirstSearch, ParameterRange,
)
search = FeasibilityFirstSearch(
    parameters=[ParameterRange(name="outer_diameter_mm", min_value=100, max_value=300),
                ParameterRange(name="inner_diameter_mm", min_value=50, max_value=150)],
    l0_engine=WebEngine(),
    total_budget=20, batch_size=4, initial_samples=6,
    objective_metric="tavg_nm", objective_direction="maximize", seed=1,
)
ini = search.generate_initial_batch()
assert len(ini) > 0
print("[8] feasibility_search L0 integration OK (%d initial pts)" % len(ini))

print("\nALL P4-M5 L0 PROMOTION TESTS PASSED")