"""
Tests for the routing bridge that wraps an llm-connect RoutingPolicy as
an infospace-bench AssistedGenerationAdapter (IB-WP-0018 T02/T05).

All tests use mocked llm-connect ``LLMAdapter`` instances — no network.
"""

from __future__ import annotations

from typing import Any

import pytest

from llm_connect.adapter import LLMAdapter
from llm_connect.models import LLMResponse, RunConfig
from llm_connect.routing import (
    AdaptiveRoutingPolicy,
    RoutingPolicy,
    RoutingRule,
)
from llm_connect.quality import QualityLedger, QualityObservation

from infospace_bench.routing import (
    STAGE_TO_TASK_TYPE_DEFAULT,
    RoutingAssistedGenerationAdapter,
)
from infospace_bench.workflow import AssistedGenerationRequest


class _MockAdapter(LLMAdapter):
    """Test double: returns a configured ``LLMResponse`` and records calls."""

    def __init__(self, *, model: str, content: str = "ok", cost_per_call: float = 0.0) -> None:
        self.model = model
        self._content = content
        self._cost_per_call = cost_per_call
        self.calls: list[tuple[str, RunConfig]] = []

    def execute_prompt(self, prompt: str, config: RunConfig) -> LLMResponse:
        self.calls.append((prompt, config))
        return LLMResponse(
            content=self._content,
            model=self.model,
            usage={"prompt_tokens": 100, "completion_tokens": 50},
            finish_reason="stop",
            metadata={"cost_per_call_usd": self._cost_per_call},
        )

    def validate_config(self, config: RunConfig) -> bool:  # pragma: no cover - trivial
        return True


def _request(stage_id: str, prompt: str = "Hello.") -> AssistedGenerationRequest:
    return AssistedGenerationRequest(
        stage_id=stage_id,
        workflow_id="generic-source-entities",
        input_artifact_id="source/test.md",
        prompt=prompt,
    )


def test_bridge_resolves_static_policy_per_stage() -> None:
    cheap = _MockAdapter(model="cheap-1", content="# Cheap")
    smart = _MockAdapter(model="smart-1", content="# Smart")
    policy = RoutingPolicy(
        rules=[
            RoutingRule(task_type="summarize-source", prefer=cheap),
            RoutingRule(task_type="extract-entities", prefer=smart),
        ],
        default=cheap,
    )
    bridge = RoutingAssistedGenerationAdapter(policy=policy)

    summary = bridge.generate(_request("summarize-source", "Source A"))
    entities = bridge.generate(_request("extract-entities", "Source A"))

    assert summary.markdown == "# Cheap"
    assert summary.metadata["task_type"] == "summarize-source"
    assert summary.metadata["model"] == "cheap-1"
    assert summary.metadata["usage"]["prompt_tokens"] == 100
    assert entities.markdown == "# Smart"
    assert entities.metadata["model"] == "smart-1"
    assert len(cheap.calls) == 1
    assert len(smart.calls) == 1


def test_bridge_honours_stage_to_task_type_overrides() -> None:
    extraction = _MockAdapter(model="extraction-1")
    policy = RoutingPolicy(
        rules=[RoutingRule(task_type="extraction", prefer=extraction)],
    )
    bridge = RoutingAssistedGenerationAdapter(
        policy=policy,
        stage_to_task_type={
            "extract-entities": "extraction",
            "extract-relations": "extraction",
        },
    )

    bridge.generate(_request("extract-entities"))
    bridge.generate(_request("extract-relations"))

    assert len(extraction.calls) == 2


def test_bridge_default_task_type_map_covers_all_known_stages() -> None:
    expected = {
        "summarize-source",
        "extract-entities",
        "extract-relations",
        "evaluate-entity",
        "synthesize-report",
    }
    assert set(STAGE_TO_TASK_TYPE_DEFAULT) == expected
    # Identity mapping by default
    for stage in expected:
        assert STAGE_TO_TASK_TYPE_DEFAULT[stage] == stage


def test_bridge_falls_through_to_stage_id_when_no_known_mapping() -> None:
    custom_adapter = _MockAdapter(model="custom-1")
    policy = RoutingPolicy(
        rules=[RoutingRule(task_type="custom-stage", prefer=custom_adapter)],
    )
    bridge = RoutingAssistedGenerationAdapter(policy=policy)

    result = bridge.generate(_request("custom-stage"))

    assert result.markdown == "# ok" or result.markdown == "ok"
    assert custom_adapter.calls, "custom stage_id should fall through to the same task_type"


def test_bridge_uses_adaptive_path_when_quality_floor_set(tmp_path) -> None:
    cheap = _MockAdapter(model="cheap-1")
    smart = _MockAdapter(model="smart-1")
    ledger = QualityLedger(path=tmp_path / "quality.jsonl")
    # Cheap clears the floor; smart does too but at a higher cost.
    for _ in range(3):
        ledger.append(
            QualityObservation(
                task_type="extract-entities",
                adapter_id="cheap-1",
                model_id="cheap-1",
                cost_usd=0.001,
                quality_score=0.9,
                tokens_in=100,
                tokens_out=50,
                latency_ms=10,
            )
        )
        ledger.append(
            QualityObservation(
                task_type="extract-entities",
                adapter_id="smart-1",
                model_id="smart-1",
                cost_usd=0.01,
                quality_score=0.95,
                tokens_in=100,
                tokens_out=50,
                latency_ms=10,
            )
        )

    policy = AdaptiveRoutingPolicy(
        rules=[RoutingRule(task_type="extract-entities", prefer=smart)],
        default=cheap,
        ledger=ledger,
        adapters_by_id={"cheap-1": cheap, "smart-1": smart},
    )
    bridge = RoutingAssistedGenerationAdapter(policy=policy, quality_floor=0.8)

    bridge.generate(_request("extract-entities"))

    assert cheap.calls, "adaptive policy should pick the cheaper qualifying adapter"
    assert not smart.calls


def test_bridge_falls_back_to_static_when_quality_floor_unset(tmp_path) -> None:
    cheap = _MockAdapter(model="cheap-1")
    smart = _MockAdapter(model="smart-1")
    ledger = QualityLedger(path=tmp_path / "quality.jsonl")

    policy = AdaptiveRoutingPolicy(
        rules=[RoutingRule(task_type="extract-entities", prefer=smart)],
        ledger=ledger,
    )
    bridge = RoutingAssistedGenerationAdapter(policy=policy)  # no quality_floor

    bridge.generate(_request("extract-entities"))

    assert smart.calls, "without a quality_floor the bridge must use static routing"
    assert not cheap.calls


def test_bridge_preserves_response_metadata_and_provider_tag() -> None:
    adapter = _MockAdapter(model="cheap-1")
    adapter.execute_prompt = lambda prompt, config: LLMResponse(  # type: ignore[assignment]
        content="# ok",
        model="cheap-1",
        usage={"prompt_tokens": 7, "completion_tokens": 3},
        finish_reason="stop",
        metadata={"request_id": "req-42"},
    )
    policy = RoutingPolicy(rules=[RoutingRule(task_type="custom", prefer=adapter)])
    bridge = RoutingAssistedGenerationAdapter(policy=policy)

    result = bridge.generate(_request("custom"))

    assert result.metadata["request_id"] == "req-42"
    assert result.metadata["usage"] == {"prompt_tokens": 7, "completion_tokens": 3}
    assert result.metadata["task_type"] == "custom"
    assert result.metadata["adapter_id"].endswith(":cheap-1")
    assert result.provider == "mock"


def test_bridge_passes_estimated_cost_per_1k_through() -> None:
    captured: dict[str, Any] = {}

    class _PolicyProbe(RoutingPolicy):
        def resolve(self, task_type, estimated_cost_per_1k=None):  # type: ignore[override]
            captured["task_type"] = task_type
            captured["estimated_cost_per_1k"] = estimated_cost_per_1k
            return _MockAdapter(model="x")

    bridge = RoutingAssistedGenerationAdapter(
        policy=_PolicyProbe(),
        estimated_cost_per_1k=0.5,
    )
    bridge.generate(_request("summarize-source"))

    assert captured["task_type"] == "summarize-source"
    assert captured["estimated_cost_per_1k"] == 0.5