"""HostEurope invoice CSV ingestion."""

from __future__ import annotations

from dataclasses import dataclass
from datetime import date
from pathlib import Path

from fin_hub.attribution import optional_attribution
from fin_hub.ingest._csv import parse_amount, pick, read_csv_rows


@dataclass(frozen=True)
class HostEuropeCostRow:
    service_id: str
    title: str
    amount: float
    currency: str
    period_month: str
    incurred_on: date | None
    environment: str = "production"
    source: str = "hosteurope"
    client_id: str | None = None
    application_id: str | None = None
    app_instance_id: str | None = None
    cost_attribution_key: str | None = None


def parse_hosteurope_csv(path: Path, *, default_currency: str = "EUR") -> list[HostEuropeCostRow]:
    rows: list[HostEuropeCostRow] = []
    for row in read_csv_rows(path):
        title = pick(row, "product", "description", "service", "title")
        amount_raw = pick(row, "amount", "net", "total", "price")
        if not title or not amount_raw:
            continue
        service_id = pick(row, "service_id", "product_id") or title.lower().replace(" ", "-")[:128]
        period = pick(row, "period_month", "month", "billing_period")
        incurred_raw = pick(row, "date", "invoice_date", "incurred_on")
        incurred_on = date.fromisoformat(incurred_raw[:10]) if incurred_raw else None
        if not period and incurred_on:
            period = incurred_on.strftime("%Y-%m")
        if not period:
            continue
        currency = pick(row, "currency") or default_currency
        environment = pick(row, "environment", "env") or "production"
        attribution = optional_attribution(
            pick(row, "client_id", "client") or None,
            pick(row, "application_id", "app_id", "application") or None,
            pick(row, "app_instance_id", "instance_id", "instance") or None,
        )
        rows.append(
            HostEuropeCostRow(
                service_id=service_id,
                title=title,
                amount=parse_amount(amount_raw),
                currency=currency.upper()[:3],
                period_month=period[:7],
                incurred_on=incurred_on,
                environment=environment,
                client_id=attribution.client_id if attribution else None,
                application_id=attribution.application_id if attribution else None,
                app_instance_id=attribution.app_instance_id if attribution else None,
                cost_attribution_key=attribution.key if attribution else None,
            )
        )
    return rows