from __future__ import annotations

import json
from collections.abc import AsyncIterator
from datetime import UTC, datetime
from decimal import Decimal
from pathlib import Path

import httpx

from broker_sync.dedup import SyncRecordStore
from broker_sync.models import Account, AccountType, Activity, ActivityType
from broker_sync.pipeline import sync_provider_to_wealthfolio
from broker_sync.sinks.wealthfolio import WealthfolioSink


class _FakeProvider:
    name = "fake"

    def __init__(self, accounts: list[Account], activities: list[Activity]) -> None:
        self._accounts = accounts
        self._activities = activities

    def accounts(self) -> list[Account]:
        return list(self._accounts)

    async def fetch(
        self,
        *,
        since: datetime | None = None,
        before: datetime | None = None,
    ) -> AsyncIterator[Activity]:
        for a in self._activities:
            yield a


def _buy(external_id: str, account_id: str = "fake-isa") -> Activity:
    return Activity(
        external_id=external_id,
        account_id=account_id,
        account_type=AccountType.ISA,
        date=datetime(2026, 4, 1, tzinfo=UTC),
        activity_type=ActivityType.BUY,
        symbol="VUAG",
        quantity=Decimal("1"),
        unit_price=Decimal("100"),
        currency="GBP",
    )


def _sink(transport: httpx.MockTransport, session_path: Path) -> WealthfolioSink:
    session_path.write_text(json.dumps({"cookies": {"wf_token": "fresh"}}))
    return WealthfolioSink(
        base_url="https://wf.test",
        username="x",
        password="x",
        session_path=session_path,
        transport=transport,
    )


async def test_pipeline_skips_dedup_then_imports_new(tmp_path: Path) -> None:
    account = Account(
        id="fake-isa",
        name="Fake ISA",
        account_type=AccountType.ISA,
        currency="GBP",
        provider="fake",
    )
    provider = _FakeProvider([account], [_buy("a"), _buy("b"), _buy("c")])

    posted_batches: list[str] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        if req.method == "GET" and req.url.path == "/api/v1/accounts":
            return httpx.Response(200, json=[{"id": "fake-isa"}])
        if req.url.path == "/api/v1/activities/import/check":
            return httpx.Response(200, json={"ok": True})
        if req.url.path == "/api/v1/activities/import":
            # The httpx request body is multipart. We don't parse the multipart
            # properly — we just scan for our dedup tags to confirm the
            # pipeline pushed the rows it should have.
            body = req.content.decode()
            posted_batches.append(body)
            # Echo back external_ids so dedup.record gets the WF activity id.
            return httpx.Response(
                200,
                json=[{
                    "id": f"wf-{i}",
                    "external_id": ext
                } for i, ext in enumerate(["a", "b", "c"])],
            )
        return httpx.Response(500)

    sink = _sink(httpx.MockTransport(handler), tmp_path / "wf-session.json")
    dedup = SyncRecordStore(tmp_path / "sync.db")
    # Seed one already-seen to confirm dedup.
    dedup.record("fake", "fake-isa", "a", wealthfolio_activity_id="wf-old")

    try:
        result = await sync_provider_to_wealthfolio(
            provider=provider,
            sink=sink,
            dedup=dedup,
        )
    finally:
        await sink.close()

    assert result.fetched == 3
    assert result.new_after_dedup == 2
    assert result.imported == 2
    assert result.failed == 0
    assert len(posted_batches) == 1
    body = posted_batches[0]
    # Only the new rows (b, c) — NOT the already-seen "a".
    assert "sync:fake:a" not in body
    assert "sync:fake:b" in body
    assert "sync:fake:c" in body

    # All three external_ids are now in dedup after the run.
    assert dedup.has_seen("fake", "fake-isa", "a")
    assert dedup.has_seen("fake", "fake-isa", "b")
    assert dedup.has_seen("fake", "fake-isa", "c")


async def test_pipeline_records_failure_when_import_rejects(tmp_path: Path) -> None:
    account = Account(
        id="fake-isa",
        name="Fake ISA",
        account_type=AccountType.ISA,
        currency="GBP",
        provider="fake",
    )
    provider = _FakeProvider([account], [_buy("a")])

    async def handler(req: httpx.Request) -> httpx.Response:
        if req.method == "GET" and req.url.path == "/api/v1/accounts":
            return httpx.Response(200, json=[{"id": "fake-isa"}])
        if req.url.path == "/api/v1/activities/import/check":
            return httpx.Response(400, json={"errors": ["bad row"]})
        return httpx.Response(500)

    sink = _sink(httpx.MockTransport(handler), tmp_path / "wf-session.json")
    dedup = SyncRecordStore(tmp_path / "sync.db")

    try:
        result = await sync_provider_to_wealthfolio(
            provider=provider,
            sink=sink,
            dedup=dedup,
        )
    finally:
        await sink.close()

    assert result.fetched == 1
    assert result.imported == 0
    assert result.failed == 1
    # NOT recorded in dedup so the next run retries.
    assert not dedup.has_seen("fake", "fake-isa", "a")