from datetime import datetime
from uuid import UUID, uuid4

import pytest
from fastapi.testclient import TestClient
from fastapi import HTTPException, status

from app.main import app
from app.dependencies.auth import TokenUser, get_current_user
from app.documents.services import DocumentRBAC, DocumentRepository, DocumentService, MinioStorageAdapter
from app.documents.controllers.router import get_document_service


class InMemoryObject:
    def __init__(self, **kwargs):
        self.id = kwargs.get("id", uuid4())
        self.tenant_id = kwargs.get("tenant_id")
        self.domain = kwargs.get("domain")
        self.entity_id = kwargs.get("entity_id")
        self.category = kwargs.get("category")
        self.bucket_name = kwargs.get("bucket_name", "cutra-scm-documents")
        self.object_key = kwargs.get("object_key")
        self.file_name = kwargs.get("file_name")
        self.mime_type = kwargs.get("mime_type")
        self.file_size = kwargs.get("file_size")
        self.visibility = kwargs.get("visibility", "private")
        self.created_by = kwargs.get("created_by")
        self.created_at = kwargs.get("created_at", datetime.utcnow())
        self.checksum_sha256 = kwargs.get("checksum_sha256")
        self.deleted_at = kwargs.get("deleted_at")
        self.legal_hold = kwargs.get("legal_hold", False)


class FakeDocumentRepository(DocumentRepository):
    def __init__(self):
        self.records = {}

    async def create_upload_placeholder(self, **kwargs):
        obj = InMemoryObject(**kwargs)
        self.records[obj.id] = obj
        return obj

    async def finalize_upload(self, object_id: UUID, tenant_id: str, checksum: str):
        obj = await self.get_active(object_id, tenant_id)
        obj.checksum_sha256 = checksum
        return obj

    async def get_upload(self, object_id: UUID, tenant_id: str):
        obj = self.records.get(object_id)
        if not obj or obj.tenant_id != tenant_id:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Upload not found")
        if obj.deleted_at:
            raise HTTPException(status_code=status.HTTP_410_GONE, detail="Object deleted")
        return obj

    async def get_active(self, object_id: UUID, tenant_id: str):
        obj = self.records.get(object_id)
        if not obj or obj.tenant_id != tenant_id or obj.deleted_at:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Object not found")
        return obj

    async def resolve_object(self, **kwargs):
        object_id = kwargs.get("object_id")
        tenant_id = kwargs.get("tenant_id")
        if object_id:
            return await self.get_active(object_id, tenant_id)
        for obj in self.records.values():
            if (
                obj.tenant_id == tenant_id
                and obj.domain == kwargs.get("domain")
                and obj.entity_id == kwargs.get("entity_id")
                and obj.category == kwargs.get("category")
                and obj.file_name == kwargs.get("file_name")
                and not obj.deleted_at
            ):
                return obj
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Object not found")

    async def find_by_checksum(self, tenant_id: str, checksum: str):
        for obj in self.records.values():
            if obj.tenant_id == tenant_id and obj.checksum_sha256 == checksum and not obj.deleted_at:
                return obj
        return None

    async def soft_delete(self, object_id: UUID, tenant_id: str):
        obj = await self.get_active(object_id, tenant_id)
        obj.deleted_at = datetime.utcnow()


class FakeStorageAdapter(MinioStorageAdapter):
    def __init__(self):
        self.force_mismatch = False

    async def create_upload_urls(self, bucket: str, object_key: str, size: int, mime: str):
        return [f"http://minio/{bucket}/{object_key}"]

    async def complete_multipart(self, bucket: str, object_key: str, parts=None):
        return None

    async def verify_checksum(self, bucket: str, object_key: str, checksum: str):
        return False if self.force_mismatch else bool(checksum)

    async def create_download_url(self, bucket: str, object_key: str):
        return f"http://minio/{bucket}/{object_key}?download=true"


@pytest.fixture()
def client():
    repo = FakeDocumentRepository()
    storage = FakeStorageAdapter()
    service = DocumentService(repo=repo, storage=storage, rbac=DocumentRBAC(), cache=None)

    def override_service():
        return service

    def override_user(role: str = "buyer", tenant: str = "tenant-1"):
        def _user():
            return TokenUser(user_id="user-1", username="u", role=role, merchant_id=tenant)
        return _user

    app.dependency_overrides[get_document_service] = override_service
    app.dependency_overrides[get_current_user] = override_user()

    yield TestClient(app), repo, storage, override_user

    app.dependency_overrides.clear()


def test_presign_and_upload_flow(client):
    api, repo, _, _ = client
    payload = {
        "domain": "po",
        "entity_id": "po-1",
        "category": "invoice",
        "file_name": "invoice.pdf",
        "mime_type": "application/pdf",
        "file_size": 1024,
        "visibility": "private",
    }
    res = api.post("/scm/storage/upload/init", json=payload)
    assert res.status_code == 200
    data = res.json()
    assert data["presigned_urls"]
    upload_id = data["upload_id"]

    complete = api.post(
        "/scm/storage/upload/complete",
        json={"upload_id": upload_id, "checksum_sha256": "abc123", "parts": None},
    )
    assert complete.status_code == 200
    assert repo.records[UUID(upload_id)].checksum_sha256 == "abc123"


def test_rbac_blocks_unauthorized_role(client):
    api, _, _, override_user = client
    app.dependency_overrides[get_current_user] = override_user(role="supplier")
    payload = {
        "domain": "promotions",
        "entity_id": "promo-1",
        "category": "banner",
        "file_name": "banner.png",
        "mime_type": "image/png",
        "file_size": 1000,
        "visibility": "private",
    }
    res = api.post("/scm/storage/upload/init", json=payload)
    assert res.status_code == status.HTTP_403_FORBIDDEN


def test_tenant_isolation_on_fetch(client):
    api, repo, _, override_user = client
    payload = {
        "domain": "po",
        "entity_id": "po-2",
        "category": "invoice",
        "file_name": "invoice2.pdf",
        "mime_type": "application/pdf",
        "file_size": 2048,
        "visibility": "private",
    }
    res = api.post("/scm/storage/upload/init", json=payload)
    object_id = res.json()["upload_id"]

    app.dependency_overrides[get_current_user] = override_user(tenant="tenant-2")
    meta = api.get(f"/scm/storage/{object_id}")
    assert meta.status_code == status.HTTP_404_NOT_FOUND


def test_checksum_mismatch_raises_conflict(client):
    api, _, storage, _ = client
    payload = {
        "domain": "po",
        "entity_id": "po-3",
        "category": "invoice",
        "file_name": "invoice3.pdf",
        "mime_type": "application/pdf",
        "file_size": 2048,
        "visibility": "private",
    }
    init_res = api.post("/scm/storage/upload/init", json=payload)
    upload_id = init_res.json()["upload_id"]
    storage.force_mismatch = True

    complete = api.post(
        "/scm/storage/upload/complete",
        json={"upload_id": upload_id, "checksum_sha256": "bad", "parts": None},
    )
    assert complete.status_code == status.HTTP_409_CONFLICT


def test_soft_delete_hides_object(client):
    api, _, _, override_user = client
    # Use ops role which has delete permissions
    app.dependency_overrides[get_current_user] = override_user(role="ops")
    payload = {
        "domain": "po",
        "entity_id": "po-4",
        "category": "invoice",
        "file_name": "invoice4.pdf",
        "mime_type": "application/pdf",
        "file_size": 2048,
        "visibility": "private",
    }
    init_res = api.post("/scm/storage/upload/init", json=payload)
    upload_id = init_res.json()["upload_id"]
    api.post(
        "/scm/storage/upload/complete",
        json={"upload_id": upload_id, "checksum_sha256": "abc", "parts": None},
    )

    delete_res = api.delete(f"/scm/storage/{upload_id}")
    assert delete_res.status_code == 200

    meta = api.get(f"/scm/storage/{upload_id}")
    assert meta.status_code == status.HTTP_404_NOT_FOUND