"""End-to-end API test on synthetic data (fast; isolated temp DB)."""
from __future__ import annotations

import os
import tempfile

# Point the app at an isolated temp data dir BEFORE importing the app/config/db.
_TMP = tempfile.mkdtemp(prefix="ar_api_test_")
os.environ["AR_DATA_DIR"] = _TMP

from fastapi.testclient import TestClient  # noqa: E402
from app.db.database import init_db  # noqa: E402
from app.api.main import app  # noqa: E402
from tests.test_excel_export import make_amazon_xlsx  # noqa: E402


def test_full_api_flow():
    init_db()
    synth = os.path.join(_TMP, "USA synthetic.xlsx")
    make_amazon_xlsx(synth, order_rows=20)

    with TestClient(app) as c:
        assert c.get("/api/health").json()["status"] == "ok"

        sid = c.post("/api/sessions", json={
            "name": "test", "month_end_date": "2026-01-31", "clearing_lag_days": 2,
        }).json()["id"]

        with open(synth, "rb") as fh:
            up = c.post(f"/api/sessions/{sid}/files", files={"files": ("USA synthetic.xlsx", fh)})
        assert up.status_code == 200
        assert up.json()[0]["status"] == "parsed"

        c.put(f"/api/sessions/{sid}/reserves",
              json=[{"marketplace": "USA", "account_type": "Standard Orders", "amount": 0.0}])

        assert c.post(f"/api/sessions/{sid}/process").status_code == 200
        st = c.get(f"/api/sessions/{sid}/status").json()
        assert st["status"] == "processed", st

        summ = c.get(f"/api/sessions/{sid}/summary").json()
        assert summ["closing_receivable_usd"] == 2580.0
        assert summ["num_settlements"] == 5
        assert summ["num_receivable_settlements"] == 3

        setts = {s["settlement_id"]: s for s in c.get(f"/api/sessions/{sid}/settlements").json()}
        assert setts["200"]["status"] == "receivable"
        assert setts["100"]["status"] == "paid"

        txns = c.get(f"/api/sessions/{sid}/transactions?receivable=true&limit=5").json()
        assert txns["total"] == 22

        recon = c.get(f"/api/sessions/{sid}/reconciliation").json()
        assert recon["status"] == "Reconciled"
        assert abs(recon["identity_difference"]) <= 0.01

        assert c.post(f"/api/sessions/{sid}/export").status_code == 200
        dl = c.get(f"/api/sessions/{sid}/export/download")
        assert dl.status_code == 200
        assert len(dl.content) > 5000        # a real xlsx workbook
        assert dl.content[:2] == b"PK"       # zip/xlsx magic


def test_invalid_file_rejected():
    init_db()
    bad = os.path.join(_TMP, "bad.txt")
    with open(bad, "w") as f:
        f.write("not a spreadsheet")
    with TestClient(app) as c:
        sid = c.post("/api/sessions", json={"name": "bad", "month_end_date": "2026-01-31"}).json()["id"]
        with open(bad, "rb") as fh:
            r = c.post(f"/api/sessions/{sid}/files", files={"files": ("bad.txt", fh)})
        assert r.status_code == 400   # unsupported extension