"""G1 -- a transaction traverses all seven services and returns a coherent result."""
import time
import uuid

import psycopg
import pytest

from harness.payloads import tx_payload

pytestmark = pytest.mark.contract


async def test_valid_transaction_returns_full_envelope(api, manifest, fresh_balances):
    """G1: a valid transaction returns 201 with the full envelope and coherent fields."""
    account_id = manifest["clean_account_id"]
    fresh_balances(account_id)

    resp = await api.post("/api/transactions", json=tx_payload(account_id))
    assert resp.status_code == 201, resp.text
    body = resp.json()

    uuid.UUID(body["transaction_id"])
    assert body["status"] in ("settled", "rejected")
    assert 0.0 <= body["risk_score"] <= 1.0
    assert isinstance(body["balance_minor"], int)
    assert "summary" in body
    uuid.UUID(body["request_id"])
    assert body["elapsed_ms"] > 0


async def test_transaction_is_durable(api, manifest, fresh_balances, dsn):
    """G1: the transaction row exists with a terminal status within 2s."""
    account_id = manifest["clean_account_id"]
    fresh_balances(account_id)

    resp = await api.post("/api/transactions", json=tx_payload(account_id))
    assert resp.status_code == 201
    tx_id = resp.json()["transaction_id"]

    deadline = time.monotonic() + 2
    status = None
    with psycopg.connect(dsn, autocommit=True) as conn:
        while time.monotonic() < deadline:
            with conn.cursor() as cur:
                cur.execute("SELECT status FROM transactions WHERE id = %s", (tx_id,))
                row = cur.fetchone()
            if row and row[0] in ("settled", "rejected"):
                status = row[0]
                break
    assert status in ("settled", "rejected"), f"transaction {tx_id} never reached a terminal status"


async def test_deposit_increases_balance_by_exact_amount(api, manifest, fresh_balances, dsn):
    """G1: a settled deposit moves the balance up by exactly amount_minor."""
    account_id = manifest["clean_account_id"]
    fresh_balances(account_id)
    with psycopg.connect(dsn, autocommit=True) as conn:
        with conn.cursor() as cur:
            cur.execute("SELECT balance_minor FROM accounts WHERE id = %s", (account_id,))
            (before,) = cur.fetchone()

    amount = 5000
    resp = await api.post(
        "/api/transactions", json=tx_payload(account_id, kind="deposit", amount_minor=amount)
    )
    assert resp.status_code == 201
    body = resp.json()
    if body["status"] == "settled":
        assert body["balance_minor"] == before + amount


async def test_withdrawal_decreases_balance_by_exact_amount(api, manifest, fresh_balances, dsn):
    """G1: a settled withdrawal moves the balance down by exactly amount_minor."""
    account_id = manifest["clean_account_id"]
    fresh_balances(account_id)
    with psycopg.connect(dsn, autocommit=True) as conn:
        with conn.cursor() as cur:
            cur.execute("SELECT balance_minor FROM accounts WHERE id = %s", (account_id,))
            (before,) = cur.fetchone()

    amount = 1000
    resp = await api.post(
        "/api/transactions", json=tx_payload(account_id, kind="withdrawal", amount_minor=amount)
    )
    assert resp.status_code == 201
    body = resp.json()
    if body["status"] == "settled":
        assert body["balance_minor"] == before - amount


async def test_sanctioned_holder_scores_higher_risk_than_clean(api, manifest, fresh_balances):
    """G1: a sanctioned account yields a materially higher risk_score than a
    clean one (assert the ordering, not a value)."""
    clean_id = manifest["clean_account_id"]
    sanctioned_id = manifest["sanctioned_account_ids"][0]
    fresh_balances(clean_id)
    fresh_balances(sanctioned_id)

    clean_resp = await api.post("/api/transactions", json=tx_payload(clean_id))
    sanctioned_resp = await api.post("/api/transactions", json=tx_payload(sanctioned_id))
    assert clean_resp.status_code == 201
    assert sanctioned_resp.status_code == 201

    clean_score = clean_resp.json()["risk_score"]
    sanctioned_score = sanctioned_resp.json()["risk_score"]
    assert sanctioned_score > clean_score, (
        f"expected sanctioned account risk_score ({sanctioned_score}) > clean ({clean_score})"
    )


async def test_insights_returns_summary_for_seeded_account(api, manifest):
    """G1: GET /api/accounts/{id}/insights returns a summary for a seeded account."""
    resp = await api.get(f"/api/accounts/{manifest['clean_account_id']}/insights")
    assert resp.status_code == 200
    assert isinstance(resp.json(), dict) and resp.json()


async def test_unknown_account_returns_404(api):
    """G1: submitting a transaction for an unknown account returns 404 with the error envelope."""
    resp = await api.post("/api/transactions", json=tx_payload(str(uuid.uuid4())))
    assert resp.status_code == 404
    body = resp.json()
    assert "error" in body and "request_id" in body


async def test_negative_amount_on_deposit_is_rejected(api, manifest):
    """G1: a negative amount_minor on a deposit returns 400 or 422."""
    resp = await api.post(
        "/api/transactions",
        json=tx_payload(manifest["clean_account_id"], kind="deposit", amount_minor=-500),
    )
    assert resp.status_code in (400, 422), resp.text


async def test_missing_required_field_returns_422(api, manifest):
    """G1: a missing required field returns 422."""
    payload = tx_payload(manifest["clean_account_id"])
    del payload["kind"]
    resp = await api.post("/api/transactions", json=payload)
    assert resp.status_code == 422