from __future__ import annotations

import sqlite3

from jarca_ledger_mcp.application.monthly_settlement_service import create_monthly_settlement
from jarca_ledger_mcp.infrastructure.sqlite.migrations import init_db


def test_create_monthly_settlement_persists_canonical_draft_and_rejects_duplicate(tmp_path):
    path = tmp_path / "ledger.sqlite3"
    init_db(str(path))

    created = create_monthly_settlement("2026-10", db_path=str(path))
    assert created["success"]
    assert created["month"] == "2026-10"
    assert created["status"] == "draft"
    assert created["settlement_id"]

    with sqlite3.connect(path) as conn:
        row = conn.execute(
            "SELECT id, month, basis_date, status FROM monthly_settlement WHERE id=?",
            (created["settlement_id"],),
        ).fetchone()
    assert row == (created["settlement_id"], "2026-10", "2026-10-31", "draft")

    duplicate = create_monthly_settlement("2026-10", db_path=str(path))
    assert duplicate["success"] is False
    assert duplicate["error_code"] == "duplicate_month"
    assert duplicate["settlement_id"] == created["settlement_id"]