from __future__ import annotations

from typing import Any

import httpx
import pytest

import app.integrations.cloudflare_client as cloudflare_module
from app.core.errors import ExternalServiceError, ValidationAppError
from app.integrations.cloudflare_client import CloudflareClient


class FakeHttpxClient:
    responses: list[httpx.Response | Exception] = []
    requests: list[tuple[str, str, dict[str, Any]]] = []

    def __init__(self, **_kwargs: Any) -> None:
        pass

    def __enter__(self) -> FakeHttpxClient:
        return self

    def __exit__(self, *_args: object) -> None:
        return None

    def request(self, method: str, path: str, **kwargs: Any) -> httpx.Response:
        self.requests.append((method, path, kwargs))
        item = self.responses.pop(0)
        if isinstance(item, Exception):
            raise item
        return item


def json_response(status: int, payload: dict[str, object]) -> httpx.Response:
    return httpx.Response(
        status,
        json=payload,
        request=httpx.Request("GET", "https://api.cloudflare.test/resource"),
    )


def test_cloudflare_request_maps_success_and_upstream_failures(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setattr(cloudflare_module.httpx, "Client", FakeHttpxClient)
    FakeHttpxClient.requests = []
    client = CloudflareClient(
        token="token", zone_name="example.com", record_name="socks.example.com"
    )

    FakeHttpxClient.responses = [json_response(200, {"success": True, "result": {"id": "1"}})]
    assert client._request("GET", "/ok") == {"id": "1"}
    assert FakeHttpxClient.requests[-1][:2] == ("GET", "/ok")

    FakeHttpxClient.responses = [
        json_response(
            403,
            {"success": False, "errors": [{"code": 9109, "message": "invalid token"}]},
        )
    ]
    with pytest.raises(ExternalServiceError, match="invalid token") as api_error:
        client._request("GET", "/denied")
    assert api_error.value.code == "9109"

    FakeHttpxClient.responses = [
        httpx.Response(
            200,
            content=b"not-json",
            request=httpx.Request("GET", "https://api.cloudflare.test/invalid"),
        )
    ]
    with pytest.raises(ExternalServiceError) as invalid_response:
        client._request("GET", "/invalid")
    assert invalid_response.value.code == "CLOUDFLARE_INVALID_RESPONSE"

    FakeHttpxClient.responses = [
        httpx.ConnectError(
            "offline", request=httpx.Request("GET", "https://api.cloudflare.test/offline")
        )
    ]
    with pytest.raises(ExternalServiceError) as connection_error:
        client._request("GET", "/offline")
    assert connection_error.value.code == "CLOUDFLARE_CONNECTION_FAILED"


def test_cloudflare_dns_contract_rejects_conflicts_and_upserts_dns_only(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    records: list[dict[str, object]] = [
        {
            "id": "record-id",
            "name": "socks.example.com",
            "type": "A",
            "content": "198.51.100.10",
            "proxied": False,
            "ttl": 60,
        }
    ]
    calls: list[tuple[str, str, dict[str, Any]]] = []

    def fake_request(method: str, path: str, **kwargs: Any) -> object:
        calls.append((method, path, kwargs))
        if path == "/zones":
            return [{"id": "resolved-zone", "name": "example.com"}]
        if path == "/zones/resolved-zone":
            return {"id": "resolved-zone", "name": "example.com"}
        if path.endswith("/dns_records") and method == "GET":
            return [*records, {"id": "ignored", "name": "other.example.com", "type": "A"}]
        if "/dns_records/record-id" in path and method == "PATCH":
            records[0] = {"id": "record-id", **kwargs["json"]}
            return dict(records[0])
        if path.endswith("/dns_records") and method == "POST":
            created = {"id": "created-id", **kwargs["json"]}
            records.append(created)
            return created
        raise AssertionError(f"unexpected Cloudflare request: {method} {path}")

    client = CloudflareClient(
        token="token", zone_name="example.com", record_name="socks.example.com"
    )
    monkeypatch.setattr(client, "_request", fake_request)
    status = client.test_connection()
    assert status["zone_id"] == "resolved-zone"
    assert status["record_ip"] == "198.51.100.10"
    assert status["proxied"] is False
    assert status["expected_proxied"] is False

    updated = client.upsert_a_record("198.51.100.20", expected_current="198.51.100.10")
    assert updated["content"] == "198.51.100.20"
    assert updated["proxied"] is False
    assert updated["ttl"] == 60
    assert any(method == "PATCH" for method, _path, _kwargs in calls)

    with pytest.raises(ValidationAppError) as externally_modified:
        client.upsert_a_record("198.51.100.30", expected_current="198.51.100.10")
    assert externally_modified.value.code == "DNS_EXTERNALLY_MODIFIED"

    with pytest.raises(ValidationAppError) as unexpectedly_present:
        client.upsert_a_record("198.51.100.30", expected_current=None)
    assert unexpectedly_present.value.code == "DNS_EXTERNALLY_MODIFIED"

    unconstrained = client.upsert_a_record("198.51.100.30")
    assert unconstrained["content"] == "198.51.100.30"
    idempotent = client.upsert_a_record("198.51.100.30", expected_current=None)
    assert idempotent["content"] == "198.51.100.30"

    records.clear()
    with pytest.raises(ValidationAppError) as externally_deleted:
        client.upsert_a_record("198.51.100.40", expected_current="198.51.100.30")
    assert externally_deleted.value.code == "DNS_EXTERNALLY_MODIFIED"

    created = client.upsert_a_record("198.51.100.40", expected_current=None)
    assert created["id"] == "created-id"

    with pytest.raises(ValidationAppError) as conflict:
        CloudflareClient._validate_records(
            [{"type": "AAAA", "name": "socks.example.com", "content": "::1"}]
        )
    assert conflict.value.code == "CONFLICTING_DNS_RECORD"
    with pytest.raises(ValidationAppError) as duplicates:
        CloudflareClient._validate_records(
            [
                {"type": "A", "content": "198.51.100.1"},
                {"type": "A", "content": "198.51.100.2"},
            ]
        )
    assert duplicates.value.code == "MULTIPLE_A_RECORDS"
    assert any(method == "POST" for method, _path, _kwargs in calls)


def test_cloudflare_upsert_supports_proxied_records_with_automatic_ttl(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    record = {
        "id": "record-id",
        "name": "socks.example.com",
        "type": "A",
        "content": "198.51.100.10",
        "proxied": False,
        "ttl": 60,
    }
    written_bodies: list[dict[str, object]] = []

    def fake_request(method: str, path: str, **kwargs: Any) -> object:
        if path == "/zones/zone-id":
            return {"id": "zone-id", "name": "example.com"}
        if path.endswith("/dns_records") and method == "GET":
            return [dict(record)]
        if path.endswith("/dns_records/record-id") and method == "PATCH":
            written_bodies.append(dict(kwargs["json"]))
            written = {"id": "record-id", **kwargs["json"]}
            record.update(written)
            return written
        raise AssertionError(f"unexpected Cloudflare request: {method} {path}")

    client = CloudflareClient(
        token="token",
        zone_name="example.com",
        zone_id="zone-id",
        record_name="socks.example.com",
        proxied=True,
    )
    monkeypatch.setattr(client, "_request", fake_request)

    before = client.test_connection()
    assert before["proxied"] is False
    assert before["expected_proxied"] is True

    updated = client.upsert_a_record(
        "198.51.100.20",
        expected_current="198.51.100.10",
    )

    assert written_bodies == [
        {
            "type": "A",
            "name": "socks.example.com",
            "content": "198.51.100.20",
            "ttl": 1,
            "proxied": True,
        }
    ]
    assert updated["content"] == "198.51.100.20"
    assert updated["proxied"] is True
    assert updated["ttl"] == 1
    after = client.test_connection()
    assert after["proxied"] is True
    assert after["expected_proxied"] is True
    assert after["ttl"] == 1


@pytest.mark.parametrize(
    ("mutated_field", "mutated_value"),
    [
        ("content", "198.51.100.99"),
        ("proxied", False),
        ("ttl", 60),
    ],
)
def test_cloudflare_upsert_rejects_failed_post_write_verification(
    monkeypatch: pytest.MonkeyPatch,
    mutated_field: str,
    mutated_value: object,
) -> None:
    record = {
        "id": "record-id",
        "name": "socks.example.com",
        "type": "A",
        "content": "198.51.100.10",
        "proxied": True,
        "ttl": 1,
    }

    def fake_request(method: str, path: str, **kwargs: Any) -> object:
        if path == "/zones/zone-id":
            return {"id": "zone-id", "name": "example.com"}
        if path.endswith("/dns_records") and method == "GET":
            return [dict(record)]
        if path.endswith("/dns_records/record-id") and method == "PATCH":
            written = {"id": "record-id", **kwargs["json"]}
            record.update(written)
            record[mutated_field] = mutated_value
            return written
        raise AssertionError(f"unexpected Cloudflare request: {method} {path}")

    client = CloudflareClient(
        token="token",
        zone_name="example.com",
        zone_id="zone-id",
        record_name="socks.example.com",
        proxied=True,
    )
    monkeypatch.setattr(client, "_request", fake_request)

    with pytest.raises(ValidationAppError) as verification_error:
        client.upsert_a_record("198.51.100.20", expected_current="198.51.100.10")

    assert verification_error.value.code == "DNS_WRITE_NOT_VERIFIED"