from importlib.util import module_from_spec, spec_from_file_location
from pathlib import Path
from typing import Any

import pytest

from ai_platform.infrastructure.config.settings import Settings
from ai_platform.presentation.http.schemas import RunRequest

SEED_SCRIPT = Path(__file__).resolve().parents[1] / "scripts" / "seed_demo.py"
SEED_SPEC = spec_from_file_location("seed_demo_script", SEED_SCRIPT)
assert SEED_SPEC is not None and SEED_SPEC.loader is not None
seed_demo = module_from_spec(SEED_SPEC)
SEED_SPEC.loader.exec_module(seed_demo)


class FakeResponse:
    def __init__(self, status_code: int, body: dict[str, Any]):
        self.status_code = status_code
        self._body = body

    def json(self) -> dict[str, Any]:
        return self._body


class FakeClient:
    def __init__(self, responses: list[FakeResponse]):
        self.responses = responses
        self.calls: list[tuple[str, str, dict[str, Any]]] = []

    def post(self, path: str, **kwargs: Any) -> FakeResponse:
        self.calls.append(("POST", path, kwargs))
        return self.responses.pop(0)

    def get(self, path: str, **kwargs: Any) -> FakeResponse:
        self.calls.append(("GET", path, kwargs))
        return self.responses.pop(0)


def settings() -> Settings:
    return Settings(
        environment="development",
        database_url="postgresql+asyncpg://local@127.0.0.1:55432/ai_platform",
    )


def complete_run_response(run_id: str, payload: dict[str, Any]) -> FakeResponse:
    request = RunRequest.model_validate(payload).model_dump(mode="json")
    return FakeResponse(
        200,
        {
            "run_id": run_id,
            "status": "completed",
            "rule_score": 80,
            "ai_score": None,
            "final_score": 80,
            "degraded": False,
            "request": {"snapshot": request["snapshot"]},
        },
    )


def test_fixture_has_realistic_conversations_and_metrics_rules():
    payload = seed_demo.load_payload()

    assert len(payload["snapshot"]["conversations"]) == 2
    assert sum(len(c["messages"]) for c in payload["snapshot"]["conversations"]) == 5
    rules = payload["scoring_config"]["rules"]
    assert {rule["field"] for rule in rules} >= {
        "metrics.conversation_count",
        "metrics.contact_message_count",
    }
    assert sum(rule["points"] for rule in rules) == 80
    assert payload["scoring_config"]["ai_weight"] == 0


def test_seed_creates_one_run_and_reads_persisted_conversation_snapshot():
    payload = seed_demo.load_payload()
    run_id = "123e4567-e89b-12d3-a456-426614174000"
    client = FakeClient(
        [
            FakeResponse(202, {"run_id": run_id}),
            complete_run_response(run_id, payload),
        ]
    )

    actual_id, result = seed_demo.seed_demo(client, settings(), "test-app-key")

    assert actual_id == run_id
    assert result["status"] == "completed"
    assert result["ai_score"] is None
    assert [call[1] for call in client.calls] == [
        "/v1/lead-scoring/runs",
        f"/v1/lead-scoring/runs/{run_id}",
    ]
    assert client.calls[0][2]["json"] == payload
    assert client.calls[0][2]["headers"]["Idempotency-Key"] == payload["request_id"]
    assert client.calls[1][2]["headers"]["Authorization"] == "Bearer test-app-key"


def test_missing_app_key_stops_without_submitting_a_run():
    client = FakeClient([])
    with pytest.raises(SystemExit, match="operator-issued app key"):
        seed_demo.seed_demo(client, settings())
    assert client.calls == []


def test_existing_app_key_accepts_idempotent_replay():
    payload = seed_demo.load_payload()
    run_id = "123e4567-e89b-12d3-a456-426614174000"
    client = FakeClient(
        [
            FakeResponse(200, {"run_id": run_id}),
            complete_run_response(run_id, payload),
        ]
    )

    actual_id, _result = seed_demo.seed_demo(client, settings(), "existing-app-secret")

    assert actual_id == run_id
    assert [call[1] for call in client.calls] == [
        "/v1/lead-scoring/runs",
        f"/v1/lead-scoring/runs/{run_id}",
    ]
    assert client.calls[0][2]["headers"]["Authorization"] == "Bearer existing-app-secret"


def test_seed_rejects_readback_without_persisted_snapshot():
    run_id = "123e4567-e89b-12d3-a456-426614174000"
    client = FakeClient(
        [
            FakeResponse(202, {"run_id": run_id}),
            FakeResponse(
                200,
                {
                    "run_id": run_id,
                    "status": "completed",
                    "ai_score": None,
                    "degraded": False,
                },
            ),
        ]
    )

    with pytest.raises(SystemExit, match="did not return the persisted conversation snapshot"):
        seed_demo.seed_demo(client, settings(), "existing-app-secret")


def test_seed_refuses_non_development_or_nonlocal_database_names():
    with pytest.raises(SystemExit, match="must be development"):
        seed_demo.validate_local_target(Settings(environment="production"))
    with pytest.raises(SystemExit, match="API target must use the local"):
        seed_demo.validate_local_target(
            Settings(
                environment="development",
                database_url="postgresql+asyncpg://local@127.0.0.1:55432/ai_platform_test",
            )
        )
    with pytest.raises(SystemExit, match="API target must use the local"):
        seed_demo.validate_local_target(
            Settings(
                environment="development",
                database_url="postgresql+asyncpg://local@remote.example:5432/ai_platform",
            )
        )
    with pytest.raises(SystemExit, match="API target must use the local"):
        seed_demo.validate_local_target(
            Settings(
                environment="development",
                database_url="postgresql+asyncpg://local@db:5432/customer_data",
            )
        )