"""Private real-statement suite (marker: private_fixtures).

Runs only when invoked explicitly:

    PRIVATE_FIXTURES_DIR=/secure/path uv run pytest -m private_fixtures

When PRIVATE_FIXTURES_DIR is unset, the ignored repository-local ``examples/``
directory is used if it contains a ``manifest.json``. Normal CI never collects
this module (the default pytest addopts deselect the marker).

Privacy contract (docs/parsers/private-fixture-gate.md):

- fixture contents, parsed rows, descriptions, identifiers, and manifest
  financial values never appear in assertion output, messages, or logs;
- failures report only the filename, adapter id, and the name of the
  mismatched aggregate;
- every file is parsed twice and the results must be identical.
"""

import json
import os
from pathlib import Path

import pytest

from app.imports.adapters import detect_adapter, magic_kind
from app.imports.service import _reconciliation_summary

pytestmark = pytest.mark.private_fixtures

REPO_EXAMPLES = Path(__file__).resolve().parents[2] / "examples"


def _load_entries() -> tuple[Path | None, list[dict], str | None]:
    """Resolve fixture entries.

    Returns (directory, entries, explicit_error). An explicit error is only
    produced when PRIVATE_FIXTURES_DIR was set on purpose: then a missing
    directory, missing/malformed manifest, or empty manifest must fail loudly
    (redacted message, no values). Without the variable, an absent or broken
    repo-local examples directory is a silent skip.
    """
    env = os.environ.get("PRIVATE_FIXTURES_DIR")
    if env:
        directory = Path(env)
        if not directory.is_dir():
            return None, [], "PRIVATE_FIXTURES_DIR is set but the directory does not exist"
        try:
            manifest = json.loads((directory / "manifest.json").read_text(encoding="utf-8"))
        except Exception:
            return directory, [], "private manifest.json is missing or unreadable"
        entries = manifest.get("fixtures") if isinstance(manifest, dict) else None
        if not isinstance(entries, list) or not entries:
            return directory, [], "private manifest declares no fixtures"
        return directory, [entry for entry in entries if isinstance(entry, dict)], None
    try:
        if not REPO_EXAMPLES.is_dir():
            return None, [], None
        manifest = json.loads((REPO_EXAMPLES / "manifest.json").read_text(encoding="utf-8"))
        entries = manifest.get("fixtures") if isinstance(manifest, dict) else None
        if not isinstance(entries, list):
            return None, [], None
        return REPO_EXAMPLES, [entry for entry in entries if isinstance(entry, dict)], None
    except Exception:
        return None, [], None


FIXTURE_DIR, ENTRIES, EXPLICIT_ERROR = _load_entries()
if EXPLICIT_ERROR:
    raise pytest.fail.Exception(EXPLICIT_ERROR)
PARAMS = ENTRIES if ENTRIES else [None]


def _check(ok: bool, name: str, what: str) -> None:
    assert ok, f"{name}: {what} mismatch"


def _fail(name: str, message: str) -> None:
    pytest.fail(f"{name}: {message}", pytrace=False)


@pytest.fixture(params=PARAMS, ids=[entry.get("filename", "unavailable") for entry in PARAMS])
def parsed(request: pytest.FixtureRequest):
    entry = request.param
    if entry is None:
        pytest.skip("private fixtures are not available")
    name = str(entry.get("filename", "unnamed"))
    path = (FIXTURE_DIR / name) if FIXTURE_DIR is not None else None
    if path is None or not path.is_file():
        _fail(name, "fixture file is missing")
    raw = path.read_bytes()
    kind = magic_kind(raw)
    if kind not in {"xlsx", "pdf"}:
        _fail(name, "unexpected file type")
    try:
        adapter = detect_adapter(raw, kind)
    except Exception:
        _fail(name, "adapter detection failed")
    if adapter.adapter_id != entry.get("adapter_id"):
        _fail(name, "adapter detection mismatch")
    try:
        first = adapter.parse(raw)
        second = adapter.parse(raw)
    except Exception:
        _fail(name, "parse failed")
    if first != second:
        _fail(name, "parse result is not deterministic")
    return name, entry, first


def test_manifest_contract(parsed) -> None:
    name, entry, draft = parsed
    _check(draft.parser_version == entry.get("parser_version"), name, "parser version")
    for key, actual in (("period_start", draft.period_start), ("period_end", draft.period_end)):
        expected = entry.get(key)
        _check(
            expected is None or (actual is not None and actual.isoformat() == expected), name, key
        )


def test_row_counts(parsed) -> None:
    name, entry, draft = parsed
    rows = draft.rows
    _check(len(rows) == entry.get("row_count"), name, "row count")
    posted = sum(1 for row in rows if row.bank_status == "posted")
    holds = sum(1 for row in rows if row.bank_status == "hold")
    _check(posted == entry.get("posted_count"), name, "posted count")
    _check(holds == entry.get("hold_count"), name, "hold count")
    _check(
        sum(1 for row in rows if row.direction == "in") == entry.get("in_count"),
        name,
        "inflow row count",
    )
    _check(
        sum(1 for row in rows if row.direction == "out") == entry.get("out_count"),
        name,
        "outflow row count",
    )


def test_row_invariants(parsed) -> None:
    name, _, draft = parsed
    rows = draft.rows
    _check(all(row.amount_kopecks >= 0 for row in rows), name, "positive amount invariant")
    _check(
        all(row.bank_status in {"posted", "hold"} for row in rows),
        name,
        "bank status invariant",
    )


def test_hold_totals(parsed) -> None:
    name, entry, draft = parsed
    hold_total = sum(row.amount_kopecks for row in draft.rows if row.bank_status == "hold")
    _check(hold_total == entry.get("hold_total_kopecks"), name, "hold total")


def test_control_totals(parsed) -> None:
    name, entry, draft = parsed
    _check(
        draft.declared_inflow_kopecks == entry.get("declared_inflow_kopecks"),
        name,
        "declared inflow total",
    )
    _check(
        draft.declared_outflow_kopecks == entry.get("declared_outflow_kopecks"),
        name,
        "declared outflow total",
    )
    _check(
        draft.declared_hold_kopecks == entry.get("declared_hold_kopecks"),
        name,
        "declared hold total",
    )


def test_balances(parsed) -> None:
    name, entry, draft = parsed
    _check(
        draft.opening_balance_kopecks == entry.get("opening_balance_kopecks"),
        name,
        "opening balance",
    )
    _check(
        draft.closing_balance_kopecks == entry.get("closing_balance_kopecks"),
        name,
        "closing balance",
    )


def test_declared_totals_match_parsed_rows(parsed) -> None:
    name, _, draft = parsed
    posted_in = sum(
        row.amount_kopecks
        for row in draft.rows
        if row.bank_status == "posted" and row.direction == "in"
    )
    posted_out = sum(
        row.amount_kopecks
        for row in draft.rows
        if row.bank_status == "posted" and row.direction == "out"
    )
    hold_total = sum(row.amount_kopecks for row in draft.rows if row.bank_status == "hold")
    # Declared controls are canonicalized to posted-only by the adapters; the
    # hold control equals the parsed hold sum.
    _check(posted_in == draft.declared_inflow_kopecks, name, "declared vs parsed inflow")
    _check(posted_out == draft.declared_outflow_kopecks, name, "declared vs parsed outflow")
    _check(hold_total == (draft.declared_hold_kopecks or 0), name, "declared vs parsed hold")


def test_service_reconciliation_matches(parsed) -> None:
    name, _, draft = parsed
    summary = _reconciliation_summary(draft)
    _check(summary.get("matched") is True, name, "service reconciliation matched")
    _check(
        summary.get("posted_totals_matched") is True,
        name,
        "service reconciliation posted totals",
    )
    _check(
        summary.get("hold_totals_matched") is not False,
        name,
        "service reconciliation hold totals",
    )