from __future__ import annotations

from datetime import datetime
from decimal import Decimal
from pathlib import Path

from broker_sync.models import AccountType, ActivityType
from broker_sync.providers.parsers.invest_engine import parse_invest_engine_email

_FIXTURES = Path(__file__).parent.parent.parent / "fixtures" / "invest_engine"


def _load(name: str) -> bytes:
    return (_FIXTURES / name).read_bytes()


# -- RFC 2822 body (v2-style, single BUY) --


def test_rfc2822_single_buy_parses_to_one_activity() -> None:
    activities = parse_invest_engine_email(_load("rfc2822_v2_single_buy.eml"))
    assert len(activities) == 1
    a = activities[0]
    assert a.activity_type is ActivityType.BUY
    assert a.symbol == "VUAG"
    assert a.quantity == Decimal("59.539562")
    assert a.unit_price == Decimal("60.46")
    assert a.currency == "GBP"
    assert a.date == datetime(2023, 1, 17)
    assert a.account_id == "invest-engine-primary"
    assert a.account_type is AccountType.ISA


def test_rfc2822_external_id_is_deterministic() -> None:
    a1 = parse_invest_engine_email(_load("rfc2822_v2_single_buy.eml"))[0]
    a2 = parse_invest_engine_email(_load("rfc2822_v2_single_buy.eml"))[0]
    assert a1.external_id == a2.external_id
    assert a1.external_id.startswith("invest-engine:")


def test_rfc2822_notes_record_parse_strategy() -> None:
    a = parse_invest_engine_email(_load("rfc2822_v2_single_buy.eml"))[0]
    assert a.notes is not None
    assert "rfc2822" in a.notes


# -- HTML table body (multipart/alternative, two orders) --


def test_html_body_parses_both_orders() -> None:
    activities = parse_invest_engine_email(_load("html_two_orders.eml"))
    assert len(activities) == 2
    a, b = activities
    assert a.symbol == "VUAG"
    assert a.quantity == Decimal("10.5")
    assert a.unit_price == Decimal("62.10")
    assert a.date == datetime(2026, 4, 1)
    assert a.account_id == "invest-engine-primary"
    assert a.account_type is AccountType.ISA
    assert a.activity_type is ActivityType.BUY
    assert b.symbol == "SWDA"
    assert b.quantity == Decimal("2.25")
    assert b.unit_price == Decimal("85.40")
    assert b.date == datetime(2026, 4, 1)


def test_html_notes_record_html_strategy() -> None:
    a = parse_invest_engine_email(_load("html_two_orders.eml"))[0]
    assert a.notes is not None
    assert "html" in a.notes


# -- CSV attachment body --


def test_csv_attachment_parses_all_rows() -> None:
    activities = parse_invest_engine_email(_load("csv_attachment.eml"))
    assert len(activities) == 3
    by_symbol = {a.symbol: a for a in activities}
    assert by_symbol["VUAG"].quantity == Decimal("12.5")
    assert by_symbol["VUAG"].unit_price == Decimal("63.21")
    assert by_symbol["VUAG"].date == datetime(2025, 4, 2)
    assert by_symbol["SWDA"].quantity == Decimal("4.75")
    assert by_symbol["VUSA"].date == datetime(2025, 4, 4)
    for a in activities:
        assert a.activity_type is ActivityType.BUY
        assert a.currency == "GBP"
        assert a.account_id == "invest-engine-primary"
        assert a.account_type is AccountType.ISA
        assert a.notes is not None
        assert "csv" in a.notes


# -- graceful failure modes --


def test_unparseable_email_returns_empty_list() -> None:
    assert parse_invest_engine_email(_load("unparseable.eml")) == []


def test_html_partial_match_returns_only_parseable_orders() -> None:
    activities = parse_invest_engine_email(_load("html_partial_match.eml"))
    assert len(activities) == 1
    a = activities[0]
    assert a.symbol == "VUAG"
    assert a.quantity == Decimal("3.0")
    assert a.unit_price == Decimal("61.25")
    assert a.date == datetime(2026, 4, 15)