from __future__ import annotations

import json
from datetime import UTC, datetime
from decimal import Decimal
from pathlib import Path
from typing import Any

import httpx
import pytest

from broker_sync.models import Account, AccountType, Activity, ActivityType
from broker_sync.sinks.wealthfolio import (
    ImportValidationError,
    WealthfolioSink,
    WealthfolioUnauthorizedError,
)


def _buy() -> Activity:
    return Activity(
        external_id="t212:1",
        account_id="t212-isa",
        account_type=AccountType.ISA,
        date=datetime(2026, 4, 1, 10, 30, tzinfo=UTC),
        activity_type=ActivityType.BUY,
        symbol="VUAG",
        quantity=Decimal("1"),
        unit_price=Decimal("100"),
        currency="GBP",
    )


def _client(handler: httpx.MockTransport, session_path: Path) -> WealthfolioSink:
    return WealthfolioSink(
        base_url="https://wf.test",
        username="viktor",
        password="hunter2",
        session_path=session_path,
        transport=handler,
    )


def _login_ok(req: httpx.Request) -> httpx.Response:
    assert req.url.path == "/api/v1/auth/login"
    body = json.loads(req.content)
    # Wealthfolio 3.2 LoginRequest is password-only.
    assert body == {"password": "hunter2"}
    return httpx.Response(
        200,
        json={
            "authenticated": True,
            "expiresIn": 604800
        },
        headers={"set-cookie": "wf_token=abc123; Path=/api; HttpOnly"},
    )


# -- Login --


async def test_login_persists_cookie(tmp_path: Path) -> None:

    async def handler(req: httpx.Request) -> httpx.Response:
        return _login_ok(req)

    sp = tmp_path / "session.json"
    sink = _client(httpx.MockTransport(handler), sp)
    await sink.login()

    data = json.loads(sp.read_text())
    assert "wf_token" in data["cookies"]
    assert data["cookies"]["wf_token"] == "abc123"


async def test_login_raises_on_401(tmp_path: Path) -> None:

    async def handler(req: httpx.Request) -> httpx.Response:
        return httpx.Response(401, json={"error": "bad creds"})

    sink = _client(httpx.MockTransport(handler), tmp_path / "s.json")
    with pytest.raises(WealthfolioUnauthorizedError):
        await sink.login()


# -- Session reuse --


async def test_session_reused_from_disk(tmp_path: Path) -> None:
    sp = tmp_path / "s.json"
    sp.write_text(json.dumps({"cookies": {"wf_token": "cached"}}))

    calls: list[str] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        calls.append(req.url.path)
        assert "wf_token=cached" in req.headers.get("cookie", "")
        return httpx.Response(200, json=[])

    sink = _client(httpx.MockTransport(handler), sp)
    await sink.list_accounts()
    assert calls == ["/api/v1/accounts"]


async def test_401_triggers_single_reauth_and_retry(tmp_path: Path) -> None:
    sp = tmp_path / "s.json"
    sp.write_text(json.dumps({"cookies": {"wf_token": "stale"}}))

    path_calls: list[tuple[str, str]] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        path_calls.append((req.method, req.url.path))
        if req.url.path == "/api/v1/accounts" and req.headers.get("cookie", "").endswith("stale"):
            return httpx.Response(401)
        if req.url.path == "/api/v1/auth/login":
            return _login_ok(req)
        # After login the stored cookie is fresh; second GET should succeed.
        return httpx.Response(200, json=[{"id": "a1"}])

    sink = _client(httpx.MockTransport(handler), sp)
    out = await sink.list_accounts()
    assert out == [{"id": "a1"}]
    assert path_calls == [
        ("GET", "/api/v1/accounts"),
        ("POST", "/api/v1/auth/login"),
        ("GET", "/api/v1/accounts"),
    ]


# -- Account ensure --


async def test_ensure_account_returns_existing_wf_id(tmp_path: Path) -> None:
    sp = tmp_path / "s.json"
    sp.write_text(json.dumps({"cookies": {"wf_token": "fresh"}}))

    posts: list[dict[str, Any]] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        if req.method == "GET" and req.url.path == "/api/v1/accounts":
            # Wealthfolio stores its own UUID for id; providerAccountId is
            # what we gave it.
            return httpx.Response(
                200,
                json=[{
                    "id": "uuid-wf-123",
                    "name": "Trading212 ISA",
                    "provider": "trading212",
                    "providerAccountId": "t212-isa",
                }],
            )
        if req.method == "POST":
            posts.append(json.loads(req.content))
        return httpx.Response(500)

    sink = _client(httpx.MockTransport(handler), sp)
    acc = Account(
        id="t212-isa",
        name="Trading212 ISA",
        account_type=AccountType.ISA,
        currency="GBP",
        provider="trading212",
    )
    wf_id = await sink.ensure_account(acc)
    assert wf_id == "uuid-wf-123"
    assert posts == []  # no create


async def test_ensure_account_creates_if_missing(tmp_path: Path) -> None:
    sp = tmp_path / "s.json"
    sp.write_text(json.dumps({"cookies": {"wf_token": "fresh"}}))

    posted: list[dict[str, Any]] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        if req.method == "GET" and req.url.path == "/api/v1/accounts":
            return httpx.Response(200, json=[])
        if req.method == "POST" and req.url.path == "/api/v1/accounts":
            posted.append(json.loads(req.content))
            return httpx.Response(
                200,
                json={
                    "id": "uuid-new-456",
                    "provider": "trading212",
                    "providerAccountId": "t212-isa",
                },
            )
        return httpx.Response(500)

    sink = _client(httpx.MockTransport(handler), sp)
    acc = Account(
        id="t212-isa",
        name="Trading212 ISA",
        account_type=AccountType.ISA,
        currency="GBP",
        provider="trading212",
    )
    wf_id = await sink.ensure_account(acc)
    assert wf_id == "uuid-new-456"
    assert len(posted) == 1
    # We no longer send our logical id — Wealthfolio would ignore it. We
    # DO send our id as providerAccountId so Wealthfolio preserves it for
    # future matching.
    assert "id" not in posted[0]
    assert posted[0]["providerAccountId"] == "t212-isa"
    assert posted[0]["accountType"] == "ISA"
    assert posted[0]["currency"] == "GBP"
    assert posted[0]["isActive"] is True
    assert posted[0]["isDefault"] is False


# -- Activity import --


async def test_import_dry_run_then_real(tmp_path: Path) -> None:
    sp = tmp_path / "s.json"
    sp.write_text(json.dumps({"cookies": {"wf_token": "fresh"}}))

    calls: list[str] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        calls.append(req.url.path)
        if req.url.path == "/api/v1/activities/import/check":
            # /import/check hydrates and returns a list of ActivityImport.
            return httpx.Response(200,
                                  json=[
                                      {
                                          "symbol": "VUAG",
                                          "isValid": True,
                                          "errors": None,
                                          "assetId": "enriched-asset-uuid",
                                          "exchangeMic": "XLON",
                                      },
                                  ])
        if req.url.path == "/api/v1/activities/import":
            return httpx.Response(
                200,
                json={
                    "activities": [
                        {
                            "id": "wf-1",
                            "external_id": "t212:1"
                        },
                    ],
                },
            )
        return httpx.Response(500)

    sink = _client(httpx.MockTransport(handler), sp)
    out = await sink.import_activities([_buy()])
    assert calls == [
        "/api/v1/activities/import/check",
        "/api/v1/activities/import",
    ]
    assert out == [{"id": "wf-1", "external_id": "t212:1"}]


async def test_import_halts_on_validation_failure(tmp_path: Path) -> None:
    sp = tmp_path / "s.json"
    sp.write_text(json.dumps({"cookies": {"wf_token": "fresh"}}))

    calls: list[str] = []

    async def handler(req: httpx.Request) -> httpx.Response:
        calls.append(req.url.path)
        if req.url.path == "/api/v1/activities/import/check":
            return httpx.Response(
                400,
                json={"errors": ["row 1: unknown symbol"]},
            )
        return httpx.Response(500)

    sink = _client(httpx.MockTransport(handler), sp)
    with pytest.raises(ImportValidationError, match="unknown symbol"):
        await sink.import_activities([_buy()])
    assert calls == ["/api/v1/activities/import/check"]  # real import never hit