import pytest
from datetime import datetime

from app.models import ComputeReceipt, JobType, WorkerRuntimeType, PrivacyMode, InferenceJob, WorkerState
from app.receipts import create_receipt, verify_receipt_hash, verify_device_receipt_signature, verify_server_receipt_signature
from app.security import generate_job_id, generate_worker_id, generate_session_id


@pytest.fixture
def sample_job():
    return InferenceJob(
        job_id=generate_job_id(),
        session_id=generate_session_id(),
        job_type=JobType.TEXT_EMBEDDING,
        privacy_mode=PrivacyMode.RAW_INPUT_REMOTE,
        payload={"text": "hello world"},
    )


@pytest.fixture
def sample_worker():
    return WorkerState(
        worker_id=generate_worker_id(),
        session_id=generate_session_id(),
        runtime_type=WorkerRuntimeType.SAFARI_WASM,
    )


@pytest.fixture
def sample_result():
    from app.models import JobResult
    return JobResult(
        job_id="job_test",
        worker_id="worker_test",
        output={"embedding": [0.1, 0.2]},
        latency_ms=150,
        input_hash="abc123",
        output_hash="def456",
    )


def test_receipt_hash_is_stable(sample_job, sample_worker, sample_result):
    receipt = create_receipt(sample_job, sample_worker, sample_result)
    assert receipt.receipt_hash is not None
    assert len(receipt.receipt_hash) == 64


def test_receipt_changes_when_output_changes(sample_job, sample_worker, sample_result):
    r1 = create_receipt(sample_job, sample_worker, sample_result)
    sample_result.output = {"embedding": [0.3, 0.4]}
    r2 = create_receipt(sample_job, sample_worker, sample_result)
    assert r1.receipt_hash != r2.receipt_hash


def test_receipt_rejects_bad_signature(sample_job, sample_worker, sample_result):
    receipt = create_receipt(sample_job, sample_worker, sample_result)
    receipt.device_signature = "bad"
    assert verify_device_receipt_signature(receipt) is False


def test_server_signature_valid(sample_job, sample_worker, sample_result):
    receipt = create_receipt(sample_job, sample_worker, sample_result)
    assert verify_server_receipt_signature(receipt) is True