from __future__ import annotations

import uuid
from dataclasses import dataclass, field
from datetime import UTC, datetime
from pathlib import Path

import httpx
import pytest
from fastapi import FastAPI
from fastapi.exceptions import RequestValidationError

from app.api.v1.documents import get_document_review_repository, router
from app.core.demo_identity import ACCESS_SCOPE_ID, KNOWLEDGE_BASE_ID
from app.core.problems import (
    ApiProblem,
    api_problem_handler,
    request_validation_problem_handler,
)
from app.core.request_context import trace_request
from app.persistence.document_review import (
    DocumentReviewConflictError,
    DocumentReviewError,
    DocumentReviewNotFoundError,
    DocumentReviewResult,
    DocumentReviewStateError,
)
from app.persistence.documents import DocumentActor, SafeJob

DOCUMENT_ID = uuid.UUID("10000000-0000-0000-0000-000000000001")
VERSION_ID = uuid.UUID("20000000-0000-0000-0000-000000000002")
JOB_ID = uuid.UUID("30000000-0000-0000-0000-000000000003")
TRACE_ID = uuid.UUID("40000000-0000-0000-0000-000000000004")
MANIFEST = "a" * 64
PROFILE = "b" * 64
NOW = datetime(2026, 7, 13, 8, 0, tzinfo=UTC)


def _job() -> SafeJob:
    return SafeJob(
        id=JOB_ID,
        job_type="EMBED_DOCUMENT",
        stage="PENDING",
        status="QUEUED",
        progress=0,
        attempt=0,
        max_attempts=3,
        last_error_code=None,
        created_at=NOW,
        updated_at=NOW,
        finished_at=None,
    )


def _approved() -> DocumentReviewResult:
    return DocumentReviewResult(
        document_id=DOCUMENT_ID,
        document_version_id=VERSION_ID,
        decision="APPROVE",
        review_state="CLOUD_APPROVED",
        review_revision=1,
        outbound_manifest_sha256=MANIFEST,
        embedding_profile_hash=PROFILE,
        job=_job(),
    )


@dataclass
class StubReviewRepository:
    result: DocumentReviewResult = field(default_factory=_approved)
    error: type[DocumentReviewError] | None = None
    calls: list[dict[str, object]] = field(default_factory=list)

    def apply_decision(self, **kwargs: object) -> DocumentReviewResult:
        self.calls.append(kwargs)
        if self.error is not None:
            raise self.error
        return self.result


def _app(repository: StubReviewRepository) -> FastAPI:
    app = FastAPI()
    app.middleware("http")(trace_request)
    app.add_exception_handler(ApiProblem, api_problem_handler)  # type: ignore[arg-type]
    app.add_exception_handler(
        RequestValidationError,
        request_validation_problem_handler,  # type: ignore[arg-type]
    )
    app.include_router(router)
    app.dependency_overrides[get_document_review_repository] = lambda: repository
    return app


def _approval() -> dict[str, object]:
    return {
        "decision": "APPROVE",
        "reason_code": "SYNTHETIC_REVIEW_APPROVED",
        "expected_revision": 0,
        "outbound_manifest_sha256": MANIFEST,
    }


@pytest.mark.asyncio
async def test_approval_is_manifest_bound_and_scope_is_server_owned(tmp_path: Path) -> None:
    del tmp_path
    repository = StubReviewRepository()
    async with httpx.AsyncClient(
        transport=httpx.ASGITransport(app=_app(repository)),
        base_url="http://test",
    ) as client:
        response = await client.post(
            f"/api/v1/documents/{DOCUMENT_ID}/review-decisions",
            headers={"x-request-id": str(TRACE_ID)},
            json=_approval(),
        )

    assert response.status_code == 202
    assert response.json() == {
        "document_id": str(DOCUMENT_ID),
        "document_version_id": str(VERSION_ID),
        "decision": "APPROVE",
        "review_state": "CLOUD_APPROVED",
        "review_revision": 1,
        "outbound_manifest_sha256": MANIFEST,
        "embedding_profile_hash": PROFILE,
        "job": {
            "id": str(JOB_ID),
            "job_type": "EMBED_DOCUMENT",
            "stage": "PENDING",
            "status": "QUEUED",
            "progress": 0,
            "attempt": 0,
            "max_attempts": 3,
            "last_error_code": None,
            "created_at": NOW.isoformat().replace("+00:00", "Z"),
            "updated_at": NOW.isoformat().replace("+00:00", "Z"),
            "finished_at": None,
        },
    }
    call = repository.calls[0]
    actor = call["actor"]
    assert isinstance(actor, DocumentActor)
    assert actor.knowledge_base_id == KNOWLEDGE_BASE_ID
    assert actor.access_scope_id == ACCESS_SCOPE_ID
    assert call["outbound_manifest_sha256"] == MANIFEST
    assert call["trace_id"] == TRACE_ID


@pytest.mark.asyncio
@pytest.mark.parametrize(
    "body",
    [
        {
            "decision": "APPROVE",
            "reason_code": "SYNTHETIC_REVIEW_APPROVED",
            "expected_revision": 0,
        },
        {
            "decision": "REJECT",
            "reason_code": "SYNTHETIC_REVIEW_APPROVED",
            "expected_revision": 0,
        },
        {
            "decision": "REJECT",
            "reason_code": "RIGHTS_NOT_VERIFIED",
            "expected_revision": 0,
            "outbound_manifest_sha256": MANIFEST,
        },
    ],
)
async def test_invalid_decision_contract_is_rejected_without_repository_call(
    body: dict[str, object],
) -> None:
    repository = StubReviewRepository()
    async with httpx.AsyncClient(
        transport=httpx.ASGITransport(app=_app(repository)),
        base_url="http://test",
    ) as client:
        response = await client.post(
            f"/api/v1/documents/{DOCUMENT_ID}/review-decisions",
            json=body,
        )

    assert response.status_code == 422
    assert response.json()["code"] == "REQUEST_VALIDATION_FAILED"
    assert "input" not in response.text
    assert repository.calls == []


@pytest.mark.asyncio
@pytest.mark.parametrize(
    ("error", "expected_status", "expected_code"),
    [
        (DocumentReviewNotFoundError, 404, "DOCUMENT_RESOURCE_NOT_FOUND"),
        (DocumentReviewConflictError, 412, "REVIEW_REVISION_CONFLICT"),
        (DocumentReviewStateError, 409, "REVIEW_STATE_CONFLICT"),
        (DocumentReviewError, 503, "DOCUMENT_PERSISTENCE_UNAVAILABLE"),
    ],
)
async def test_review_failures_map_to_safe_problem_details(
    error: type[DocumentReviewError],
    expected_status: int,
    expected_code: str,
) -> None:
    repository = StubReviewRepository(error=error)
    async with httpx.AsyncClient(
        transport=httpx.ASGITransport(app=_app(repository)),
        base_url="http://test",
    ) as client:
        response = await client.post(
            f"/api/v1/documents/{DOCUMENT_ID}/review-decisions",
            json=_approval(),
        )

    assert response.status_code == expected_status
    assert response.json()["code"] == expected_code
    assert MANIFEST not in response.text