from types import SimpleNamespace
from typing import Any
from unittest.mock import AsyncMock, MagicMock

import httpx
import pytest

from src.config.settings import config
from src.services.candidate.submit import (
    AllCandidatesFailedError,
    SubmitOutcome,
    UpstreamClientRequestError,
)
from src.services.task.service import TaskService
from src.services.task.submit.outcome_builder import SubmitPayloadParseResult


def _make_candidate(
    *,
    provider_id: str = "p1",
    provider_name: str = "prov",
    provider_config: dict[str, Any] | None = None,
    endpoint_id: str = "e1",
    key_id: str = "k1",
    key_name: str = "key",
    auth_type: str = "api_key",
    priority: int = 0,
    is_cached: bool = False,
    is_skipped: bool = False,
    skip_reason: str | None = None,
    needs_conversion: bool = False,
) -> SimpleNamespace:
    provider = SimpleNamespace(id=provider_id, name=provider_name, config=provider_config or {})
    endpoint = SimpleNamespace(id=endpoint_id)
    key = SimpleNamespace(id=key_id, name=key_name, auth_type=auth_type, priority=priority)
    return SimpleNamespace(
        provider=provider,
        endpoint=endpoint,
        key=key,
        is_cached=is_cached,
        is_skipped=is_skipped,
        skip_reason=skip_reason,
        needs_conversion=needs_conversion,
    )


@pytest.mark.asyncio
async def test_submit_with_failover_continues_on_http_400_without_stop_rule_then_succeeds(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    db = MagicMock()
    svc = TaskService(db)

    monkeypatch.setattr(
        "src.services.system.config.SystemConfigService.get_config",
        lambda *_args, **_kwargs: "provider",
    )
    monkeypatch.setattr(
        "src.services.scheduling.aware_scheduler.get_cache_aware_scheduler",
        AsyncMock(return_value=None),
    )
    monkeypatch.setattr(
        "src.services.candidate.resolver.CandidateResolver.fetch_candidates",
        AsyncMock(
            return_value=(
                [
                    _make_candidate(provider_id="p1", endpoint_id="e1", key_id="k1"),
                    _make_candidate(provider_id="p2", endpoint_id="e2", key_id="k2"),
                ],
                "gm1",
            )
        ),
    )
    responses = [
        httpx.Response(400, json={"error": {"type": "invalid_request_error", "message": "bad"}}),
        httpx.Response(200, json={"id": "task-123"}),
    ]
    submit = AsyncMock(side_effect=responses)

    outcome = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(),
        request_id=None,
        task_type="video",
        submit_func=submit,
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
    )

    assert outcome.external_task_id == "task-123"
    assert outcome.candidate.provider.id == "p2"
    assert outcome.candidate_keys[1]["selected"] is True
    assert submit.await_count == 2


@pytest.mark.asyncio
async def test_submit_with_failover_stops_on_provider_error_stop_rule(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    db = MagicMock()
    svc = TaskService(db)

    monkeypatch.setattr(
        "src.services.system.config.SystemConfigService.get_config",
        lambda *_args, **_kwargs: "provider",
    )
    monkeypatch.setattr(
        "src.services.scheduling.aware_scheduler.get_cache_aware_scheduler",
        AsyncMock(return_value=None),
    )
    monkeypatch.setattr(
        "src.services.candidate.resolver.CandidateResolver.fetch_candidates",
        AsyncMock(
            return_value=(
                [
                    _make_candidate(
                        provider_config={
                            "failover_rules": {
                                "error_stop_patterns": [
                                    {"pattern": "invalid_request_error", "status_codes": [400]}
                                ]
                            }
                        }
                    )
                ],
                "gm1",
            )
        ),
    )

    response = httpx.Response(
        400,
        json={"error": {"type": "invalid_request_error", "message": "bad request"}},
    )
    submit = AsyncMock(return_value=response)

    with pytest.raises(UpstreamClientRequestError):
        await svc.submit_with_failover(
            api_format="openai:video",
            model_name="sora",
            affinity_key="a1",
            user_api_key=MagicMock(),
            request_id=None,
            task_type="video",
            submit_func=submit,
            extract_external_task_id=lambda payload: payload.get("id"),
            supported_auth_types={"api_key"},
            allow_format_conversion=False,
            max_candidates=10,
        )


@pytest.mark.asyncio
async def test_submit_with_failover_continues_on_provider_success_failover_rule(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    db = MagicMock()
    svc = TaskService(db)

    monkeypatch.setattr(
        "src.services.system.config.SystemConfigService.get_config",
        lambda *_args, **_kwargs: "provider",
    )
    monkeypatch.setattr(
        "src.services.scheduling.aware_scheduler.get_cache_aware_scheduler",
        AsyncMock(return_value=None),
    )
    monkeypatch.setattr(
        "src.services.candidate.resolver.CandidateResolver.fetch_candidates",
        AsyncMock(
            return_value=(
                [
                    _make_candidate(
                        provider_id="p1",
                        endpoint_id="e1",
                        key_id="k1",
                        provider_config={
                            "failover_rules": {
                                "success_failover_patterns": [{"pattern": "fallback_me"}]
                            }
                        },
                    ),
                    _make_candidate(provider_id="p2", endpoint_id="e2", key_id="k2"),
                ],
                "gm1",
            )
        ),
    )

    responses = [
        httpx.Response(200, json={"id": "task-should-not-be-used", "message": "fallback_me"}),
        httpx.Response(200, json={"id": "task-123"}),
    ]
    submit = AsyncMock(side_effect=responses)

    outcome = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(),
        request_id=None,
        task_type="video",
        submit_func=submit,
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
    )

    assert outcome.external_task_id == "task-123"
    assert outcome.candidate.provider.id == "p2"
    assert submit.await_count == 2


@pytest.mark.asyncio
async def test_submit_with_failover_no_eligible_candidates_due_to_auth_type(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    db = MagicMock()
    svc = TaskService(db)

    monkeypatch.setattr(
        "src.services.system.config.SystemConfigService.get_config",
        lambda *_args, **_kwargs: "provider",
    )
    monkeypatch.setattr(
        "src.services.scheduling.aware_scheduler.get_cache_aware_scheduler",
        AsyncMock(return_value=None),
    )
    monkeypatch.setattr(
        "src.services.candidate.resolver.CandidateResolver.fetch_candidates",
        AsyncMock(return_value=([_make_candidate(auth_type="vertex_ai")], "gm1")),
    )

    with pytest.raises(AllCandidatesFailedError) as excinfo:
        await svc.submit_with_failover(
            api_format="openai:video",
            model_name="sora",
            affinity_key="a1",
            user_api_key=MagicMock(),
            request_id=None,
            task_type="video",
            submit_func=AsyncMock(),
            extract_external_task_id=lambda payload: payload.get("id"),
            supported_auth_types={"api_key"},
            allow_format_conversion=False,
            max_candidates=10,
        )

    assert excinfo.value.reason == "no_eligible_candidates"


@pytest.mark.asyncio
async def test_submit_with_failover_filters_missing_billing_rule(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    db = MagicMock()
    svc = TaskService(db)

    monkeypatch.setattr(
        "src.services.system.config.SystemConfigService.get_config",
        lambda *_args, **_kwargs: "provider",
    )
    monkeypatch.setattr(
        "src.services.scheduling.aware_scheduler.get_cache_aware_scheduler",
        AsyncMock(return_value=None),
    )
    monkeypatch.setattr(
        "src.services.candidate.resolver.CandidateResolver.fetch_candidates",
        AsyncMock(
            return_value=(
                [
                    _make_candidate(provider_id="p1", endpoint_id="e1", key_id="k1"),
                    _make_candidate(provider_id="p2", endpoint_id="e2", key_id="k2"),
                ],
                "gm1",
            )
        ),
    )
    # enable require_rule
    old = config.billing_require_rule
    try:
        config.billing_require_rule = True

        def _find_rule(
            _db: Any, *, provider_id: str, model_name: str, task_type: str
        ) -> object | None:
            return None if provider_id == "p1" else object()

        monkeypatch.setattr(
            "src.services.billing.rule_service.BillingRuleService.find_rule", _find_rule
        )

        submit = AsyncMock(return_value=httpx.Response(200, json={"id": "task-999"}))
        outcome = await svc.submit_with_failover(
            api_format="openai:video",
            model_name="sora",
            affinity_key="a1",
            user_api_key=MagicMock(),
            request_id=None,
            task_type="video",
            submit_func=submit,
            extract_external_task_id=lambda payload: payload.get("id"),
            supported_auth_types={"api_key"},
            allow_format_conversion=False,
            max_candidates=10,
        )
        assert outcome.candidate.provider.id == "p2"
        assert outcome.external_task_id == "task-999"
        # only called once because p1 skipped
        assert submit.await_count == 1
    finally:
        config.billing_require_rule = old


@pytest.mark.asyncio
async def test_submit_with_failover_applies_pool_reorder_before_submit(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    db = MagicMock()
    svc = TaskService(db)

    monkeypatch.setattr(
        "src.services.system.config.SystemConfigService.get_config",
        lambda *_args, **_kwargs: "provider",
    )
    monkeypatch.setattr(
        "src.services.scheduling.aware_scheduler.get_cache_aware_scheduler",
        AsyncMock(return_value=None),
    )

    pool_candidate_a = _make_candidate(
        provider_id="pool-1",
        provider_name="pool-provider",
        endpoint_id="ep-1",
        key_id="k-a",
        key_name="key-a",
    )
    pool_candidate_b = _make_candidate(
        provider_id="pool-1",
        provider_name="pool-provider",
        endpoint_id="ep-1",
        key_id="k-b",
        key_name="key-b",
    )

    fetch_candidates = AsyncMock(
        return_value=(
            [pool_candidate_a, pool_candidate_b],
            "gm1",
        )
    )
    monkeypatch.setattr(
        "src.services.candidate.resolver.CandidateResolver.fetch_candidates",
        fetch_candidates,
    )

    reordered = [pool_candidate_b, pool_candidate_a]
    apply_pool_reorder = AsyncMock(return_value=(reordered, []))
    monkeypatch.setattr(svc._submit_ops, "_apply_pool_reorder", apply_pool_reorder)  # type: ignore[attr-defined]

    submit = AsyncMock(return_value=httpx.Response(200, json={"id": "task-pooled"}))
    body = {"session_id": "sid-123"}
    outcome = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(),
        request_id=None,
        task_type="video",
        submit_func=submit,
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
        request_body=body,
    )

    assert outcome.external_task_id == "task-pooled"
    assert outcome.candidate.key.id == "k-b"
    assert submit.await_count == 1
    fetch_candidates.assert_awaited_once()
    await_args = fetch_candidates.await_args
    assert await_args is not None
    assert await_args.kwargs.get("request_body") == body
    apply_pool_reorder.assert_awaited_once_with(
        [pool_candidate_a, pool_candidate_b],
        request_body=body,
    )


@pytest.mark.asyncio
async def test_submit_with_failover_orchestrates_prepare_and_execute_layers() -> None:
    db = MagicMock()
    svc = TaskService(db)
    candidate = _make_candidate(provider_id="p2", endpoint_id="e2", key_id="k2")

    prepared = SimpleNamespace(candidates=[candidate], record_map={(0, 0): "rc-1"})
    outcome = SubmitOutcome(
        candidate=candidate,  # type: ignore[arg-type]
        candidate_keys=[{"index": 0, "provider_id": "p2", "selected": True}],
        external_task_id="task-layered",
        rule_lookup=None,
        upstream_payload={"id": "task-layered"},
        upstream_headers={"x-test": "1"},
        upstream_status_code=200,
    )

    svc._submit_ops._prepare_ops.prepare_candidates = AsyncMock(  # type: ignore[attr-defined, method-assign]
        return_value=prepared
    )
    svc._submit_ops._execute_ops.execute_submit_loop = AsyncMock(  # type: ignore[attr-defined, method-assign]
        return_value=outcome
    )

    result = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(user_id="u1"),
        request_id="rid-1",
        task_type="video",
        submit_func=AsyncMock(),
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
    )

    assert result.external_task_id == "task-layered"
    svc._submit_ops._prepare_ops.prepare_candidates.assert_awaited_once()  # type: ignore[attr-defined]
    svc._submit_ops._execute_ops.execute_submit_loop.assert_awaited_once()  # type: ignore[attr-defined]


@pytest.mark.asyncio
async def test_submit_with_failover_execute_layer_orchestrates_filter_and_attempt() -> None:
    db = MagicMock()
    svc = TaskService(db)
    candidate = _make_candidate(provider_id="p2", endpoint_id="e2", key_id="k2")

    prepared = SimpleNamespace(candidates=[candidate], record_map={(0, 0): "rc-1"})
    outcome = SubmitOutcome(
        candidate=candidate,  # type: ignore[arg-type]
        candidate_keys=[{"index": 0, "provider_id": "p2", "selected": True}],
        external_task_id="task-inner",
        rule_lookup=None,
        upstream_payload={"id": "task-inner"},
        upstream_headers={"x-test": "1"},
        upstream_status_code=200,
    )

    svc._submit_ops._prepare_ops.prepare_candidates = AsyncMock(  # type: ignore[attr-defined, method-assign]
        return_value=prepared
    )
    svc._submit_ops._execute_ops._filter_ops.build_candidate_info = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value={
            "index": 0,
            "provider_id": "p2",
            "provider_name": "prov",
            "endpoint_id": "e2",
            "key_id": "k2",
            "key_name": "key",
            "auth_type": "api_key",
            "priority": 0,
            "is_cached": False,
        }
    )
    svc._submit_ops._execute_ops._filter_ops.prepare_candidate_for_attempt = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value=SimpleNamespace(record_id="rc-1", rule_lookup=None)
    )
    svc._submit_ops._execute_ops._attempt_ops.submit_candidate = AsyncMock(  # type: ignore[attr-defined, method-assign]
        return_value=(outcome, 200)
    )

    result = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(user_id="u1"),
        request_id="rid-2",
        task_type="video",
        submit_func=AsyncMock(),
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
    )

    assert result.external_task_id == "task-inner"
    svc._submit_ops._execute_ops._filter_ops.build_candidate_info.assert_called_once()  # type: ignore[attr-defined]
    svc._submit_ops._execute_ops._filter_ops.prepare_candidate_for_attempt.assert_called_once()  # type: ignore[attr-defined]
    svc._submit_ops._execute_ops._attempt_ops.submit_candidate.assert_awaited_once()  # type: ignore[attr-defined]


@pytest.mark.asyncio
async def test_submit_with_failover_attempt_layer_delegates_to_response_ops() -> None:
    db = MagicMock()
    svc = TaskService(db)
    candidate = _make_candidate(provider_id="p3", endpoint_id="e3", key_id="k3")

    prepared = SimpleNamespace(candidates=[candidate], record_map={(0, 0): "rc-3"})
    outcome = SubmitOutcome(
        candidate=candidate,  # type: ignore[arg-type]
        candidate_keys=[{"index": 0, "provider_id": "p3", "selected": True}],
        external_task_id="task-attempt",
        rule_lookup=None,
        upstream_payload={"id": "task-attempt"},
        upstream_headers={"x-test": "1"},
        upstream_status_code=200,
    )

    svc._submit_ops._prepare_ops.prepare_candidates = AsyncMock(  # type: ignore[attr-defined, method-assign]
        return_value=prepared
    )
    svc._submit_ops._execute_ops._filter_ops.build_candidate_info = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value={
            "index": 0,
            "provider_id": "p3",
            "provider_name": "prov3",
            "endpoint_id": "e3",
            "key_id": "k3",
            "key_name": "key3",
            "auth_type": "api_key",
            "priority": 0,
            "is_cached": False,
        }
    )
    svc._submit_ops._execute_ops._filter_ops.prepare_candidate_for_attempt = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value=SimpleNamespace(record_id="rc-3", rule_lookup=None)
    )
    svc._submit_ops._execute_ops._attempt_ops._record_ops.mark_pending = MagicMock()  # type: ignore[attr-defined, method-assign]
    svc._submit_ops._execute_ops._attempt_ops._response_ops.handle_submit_response = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value=(outcome, 200)
    )

    submit = AsyncMock(return_value=httpx.Response(200, json={"id": "task-attempt"}))

    result = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(user_id="u1"),
        request_id="rid-3",
        task_type="video",
        submit_func=submit,
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
    )

    assert result.external_task_id == "task-attempt"
    svc._submit_ops._execute_ops._attempt_ops._record_ops.mark_pending.assert_called_once()  # type: ignore[attr-defined]
    submit.assert_awaited_once_with(candidate)
    svc._submit_ops._execute_ops._attempt_ops._response_ops.handle_submit_response.assert_called_once()  # type: ignore[attr-defined]


@pytest.mark.asyncio
async def test_submit_with_failover_response_layer_delegates_to_decider_and_builder() -> None:
    db = MagicMock()
    svc = TaskService(db)
    candidate = _make_candidate(provider_id="p4", endpoint_id="e4", key_id="k4")

    prepared = SimpleNamespace(candidates=[candidate], record_map={(0, 0): "rc-4"})
    outcome = SubmitOutcome(
        candidate=candidate,  # type: ignore[arg-type]
        candidate_keys=[{"index": 0, "provider_id": "p4", "selected": True}],
        external_task_id="task-response",
        rule_lookup=None,
        upstream_payload={"id": "task-response"},
        upstream_headers={"x-test": "1"},
        upstream_status_code=200,
    )

    svc._submit_ops._prepare_ops.prepare_candidates = AsyncMock(  # type: ignore[attr-defined, method-assign]
        return_value=prepared
    )
    svc._submit_ops._execute_ops._filter_ops.build_candidate_info = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value={
            "index": 0,
            "provider_id": "p4",
            "provider_name": "prov4",
            "endpoint_id": "e4",
            "key_id": "k4",
            "key_name": "key4",
            "auth_type": "api_key",
            "priority": 0,
            "is_cached": False,
        }
    )
    svc._submit_ops._execute_ops._filter_ops.prepare_candidate_for_attempt = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value=SimpleNamespace(record_id="rc-4", rule_lookup=None)
    )
    response_ops = svc._submit_ops._execute_ops._attempt_ops._response_ops  # type: ignore[attr-defined]
    response_ops._rule_decider.detect_error_stop_pattern = MagicMock(return_value=None)  # type: ignore[attr-defined, method-assign]
    response_ops._rule_decider.detect_success_failover_pattern = MagicMock(return_value=None)  # type: ignore[attr-defined, method-assign]
    response_ops._outcome_builder.parse_payload = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value=SubmitPayloadParseResult(payload={"id": "task-response"})
    )
    response_ops._outcome_builder.build_success_outcome = MagicMock(  # type: ignore[attr-defined, method-assign]
        return_value=outcome
    )

    submit = AsyncMock(return_value=httpx.Response(200, json={"id": "task-response"}))

    result = await svc.submit_with_failover(
        api_format="openai:video",
        model_name="sora",
        affinity_key="a1",
        user_api_key=MagicMock(user_id="u1"),
        request_id="rid-4",
        task_type="video",
        submit_func=submit,
        extract_external_task_id=lambda payload: payload.get("id"),
        supported_auth_types={"api_key"},
        allow_format_conversion=False,
        max_candidates=10,
    )

    assert result.external_task_id == "task-response"
    response_ops._rule_decider.detect_error_stop_pattern.assert_not_called()  # type: ignore[attr-defined]
    response_ops._rule_decider.detect_success_failover_pattern.assert_called_once()  # type: ignore[attr-defined]
    response_ops._outcome_builder.parse_payload.assert_called_once()  # type: ignore[attr-defined]
    response_ops._outcome_builder.build_success_outcome.assert_called_once()  # type: ignore[attr-defined]