import json
import sys
import os

# Ensure the src/ directory is on PYTHONPATH for tests when running from repo root
repo_root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
src_dir = os.path.join(repo_root, "src")
if src_dir not in sys.path:
    sys.path.insert(0, src_dir)

from exprove import LocalExecutionTask, SharedMarketContext, PlanDelta
from exprove.engine import compute_plan_delta


def test_local_execution_task_serialization():
    t = LocalExecutionTask(
        task_id="t1",
        instrument="GOOG",
        venue="VenueX",
        objective="VWAP",
        constraints={"latency": 10},
    )
    s = t.to_json()
    assert isinstance(s, str)
    d = json.loads(s)
    assert d["task_id"] == "t1"
    assert d["instrument"] == "GOOG"


def test_engine_deterministic_delta():
    task = LocalExecutionTask(
        task_id="t2",
        instrument="MSFT",
        venue="VenueY",
        objective="VWAP",
        constraints={"latency": 5},
    )
    ctx = SharedMarketContext(signals={"depth": 10}, version=2, contract_id="c-2")
    delta1 = compute_plan_delta(task, ctx, author="engine")
    delta2 = compute_plan_delta(task, ctx, author="engine")
    assert delta1.delta == delta2.delta
    assert delta1.timestamp <= delta2.timestamp  # non-decreasing timestamp on re-run is fine


def test_attestation_and_auditlog_serialization():
    from exprove.contracts import Attestation, AuditLog
    a = Attestation(entry="delta committed", signer="issuer", timestamp=1.0, contract_id="c-3", version=1)
    log = AuditLog()
    log.add(a)
    j = log.to_json()
    assert isinstance(j, str)