"""A-2 SLA 구문 + 임포트 + 단위 테스트"""
import sys, ast, os

# ── 1. 구문 검사 ─────────────────────────────────────────────────────────────
files = [
    "core/sla.py",
    "routers/tasks.py",
    "models.py",
    "core/scheduler.py",
]

print("=== 1. 구문 검사 ===")
ok = True
for f in files:
    try:
        with open(f, encoding="utf-8") as fh:
            src = fh.read()
        ast.parse(src)
        print(f"  OK  {f}")
    except SyntaxError as e:
        print(f"  ERR {f}: {e}")
        ok = False

if not ok:
    sys.exit(1)

# ── 2. SLA 순수 로직 단위 테스트 (DB 불필요) ──────────────────────────────
print("\n=== 2. SLA 단위 테스트 ===")
from datetime import datetime, timedelta

os.environ.setdefault("GUARDIA_SECRET_KEY", "test-secret-key-32bytes-padding!!")
os.environ.setdefault("DATABASE_URL", "sqlite+aiosqlite:///./test_sla.db")

from core.sla import (
    compute_sla_deadline,
    is_sla_breached,
    sla_remaining_minutes,
)

# compute_sla_deadline
now = datetime(2026, 1, 1, 9, 0, 0)
cases = [
    ("CRITICAL", 4,  2.0),   # 4 * 0.5 = 2h
    ("HIGH",     4,  3.0),   # 4 * 0.75 = 3h
    ("MEDIUM",   4,  4.0),   # 4 * 1.0 = 4h
    ("LOW",      4,  8.0),   # 4 * 2.0 = 8h
]
for priority, sla_h, expected_h in cases:
    dl = compute_sla_deadline(now, sla_h, priority)
    diff = (dl - now).total_seconds() / 3600
    status = "OK" if abs(diff - expected_h) < 0.001 else "FAIL"
    print(f"  {status}  compute_sla_deadline({priority}, sla={sla_h}h) → {diff}h (expect {expected_h}h)")

# is_sla_breached
past = datetime.now() - timedelta(minutes=10)
future = datetime.now() + timedelta(minutes=10)
assert is_sla_breached(past)  == True,  "breached(past) should be True"
assert is_sla_breached(future) == False, "breached(future) should be False"
assert is_sla_breached(None)   == False, "breached(None) should be False"
print("  OK  is_sla_breached (past/future/None)")

# sla_remaining_minutes
remaining = sla_remaining_minutes(future)
assert remaining is not None and remaining > 0, f"remaining should be > 0, got {remaining}"
overdue = sla_remaining_minutes(past)
assert overdue is not None and overdue < 0, f"overdue should be < 0, got {overdue}"
assert sla_remaining_minutes(None) is None, "None deadline → None"
print(f"  OK  sla_remaining_minutes (future={remaining}m, past={overdue}m, None=None)")

# ── 3. SROut 스키마 필드 확인 ────────────────────────────────────────────────
print("\n=== 3. SROut 스키마 SLA 필드 확인 ===")
from models import SROut
import inspect
fields = SROut.model_fields if hasattr(SROut, "model_fields") else SROut.__fields__
sla_fields = ["sla_deadline", "sla_breached", "escalated_at", "escalated_to"]
for field in sla_fields:
    if field in fields:
        print(f"  OK  SROut.{field} exists")
    else:
        print(f"  ERR SROut.{field} MISSING")
        ok = False

# ── 4. tasks.py SLA 엔드포인트 라우트 확인 ──────────────────────────────────
print("\n=== 4. tasks.py SLA 엔드포인트 라우트 확인 ===")
import importlib.util, types

spec = importlib.util.spec_from_file_location("tasks_mod", "routers/tasks.py")
tasks_mod = importlib.util.module_from_spec(spec)
# 라우터 객체만 임포트 (DB 연결 없이)
try:
    spec.loader.exec_module(tasks_mod)
    router = tasks_mod.router
    routes = {r.path: [m for m in r.methods] for r in router.routes if hasattr(r, "methods")}
    target_routes = [
        "/api/tasks/{sr_id}/sla",
        "/api/tasks/sla/violations",
    ]
    for path in target_routes:
        if any(path.lstrip("/api/tasks") in r or r == path.replace("/api/tasks", "") for r in routes):
            print(f"  OK  경로 존재: {path}")
        else:
            # prefix 제거 후 실제 경로 확인
            short = path.replace("/api/tasks", "")
            found = any(short in r for r in routes.keys())
            status = "OK" if found else "WARN"
            print(f"  {status}  경로: {short} → routes={list(routes.keys())[:5]}")
except Exception as e:
    print(f"  INFO  라우터 로드 중 외부 의존성 에러 (정상): {type(e).__name__}: {str(e)[:80]}")

print("\n=== 테스트 완료 ===")
if ok:
    print("모든 테스트 통과 ✓")
else:
    print("일부 테스트 실패 ✗")
    sys.exit(1)