"""Async clients for OpenViking and EverOS used by the lightweight API."""
from __future__ import annotations

from dataclasses import dataclass
from datetime import datetime, timezone
from typing import Any

import httpx

from .config import get_config
from .store import OpenVikingUserKeyStore


@dataclass(frozen=True)
class OpenVikingCredential:
    api_key: str
    account_id: str | None = None
    user_id: str | None = None


class OpenVikingMemorySystemClient:
    def __init__(self, store: OpenVikingUserKeyStore | None = None) -> None:
        config = get_config()
        self.base_url = config.openviking.url.rstrip("/")
        self.root_key = config.openviking.api_key or "your-secret-root-key"
        self.timeout = config.openviking.timeout
        self.verify_ssl = config.openviking.verify_ssl
        self.store = store or OpenVikingUserKeyStore(config.storage.sqlite_path)

    async def health(self) -> dict[str, Any]:
        async with self._client(self.root_key) as client:
            response = await client.get("/health")
            response.raise_for_status()
            return response.json()

    async def ensure_user(self, user_id: str) -> OpenVikingCredential:
        existing = self.store.get_user_key(user_id)
        if existing:
            return OpenVikingCredential(api_key=existing)

        async with self._client(self.root_key) as client:
            response = await client.post(
                "/api/v1/admin/accounts",
                json={"account_id": user_id, "admin_user_id": user_id},
            )
            if response.status_code == 409:
                return self.root_credential(user_id)
            response.raise_for_status()
            data = response.json()

        user_key = self._extract_user_key(data)
        if not user_key:
            return self.root_credential(user_id)
        self.store.save_user_key(user_id, user_key)
        return OpenVikingCredential(api_key=user_key)

    def root_credential(self, user_id: str) -> OpenVikingCredential:
        return OpenVikingCredential(api_key=self.root_key, account_id=user_id, user_id=user_id)

    async def ensure_session(self, credential: OpenVikingCredential | str, session_id: str) -> dict[str, Any]:
        async with self._credential_client(credential) as client:
            response = await client.post("/api/v1/sessions", json={"session_id": session_id})
            if response.status_code in {409, 422}:
                return {"session_id": session_id, "status": "exists"}
            response.raise_for_status()
            return response.json()

    async def append_message(
        self, credential: OpenVikingCredential | str, session_id: str, role: str, content: str
    ) -> dict[str, Any]:
        async with self._credential_client(credential) as client:
            response = await client.post(
                f"/api/v1/sessions/{session_id}/messages",
                json={"role": role, "content": content},
            )
            response.raise_for_status()
            return response.json()

    async def commit_session(self, credential: OpenVikingCredential | str, session_id: str) -> dict[str, Any]:
        async with self._credential_client(credential) as client:
            response = await client.post(f"/api/v1/sessions/{session_id}/commit")
            response.raise_for_status()
            return response.json()

    async def extract_session(self, credential: OpenVikingCredential | str, session_id: str) -> dict[str, Any]:
        async with self._credential_client(credential) as client:
            response = await client.post(f"/api/v1/sessions/{session_id}/extract")
            response.raise_for_status()
            return response.json()

    async def get_task(self, credential: OpenVikingCredential | str, task_id: str) -> dict[str, Any]:
        async with self._credential_client(credential) as client:
            response = await client.get(f"/api/v1/tasks/{task_id}")
            response.raise_for_status()
            return response.json()

    async def find(
        self, credential: OpenVikingCredential | str, user_id: str, query: str, limit: int
    ) -> dict[str, Any]:
        async with self._credential_client(credential) as client:
            response = await client.post(
                "/api/v1/search/find",
                json={
                    "query": query,
                    "target_uri": f"viking://user/{user_id}/memories/",
                    "limit": limit,
                },
            )
            response.raise_for_status()
            return response.json()

    async def search(
        self, credential: OpenVikingCredential | str, session_id: str | None, query: str, limit: int
    ) -> dict[str, Any]:
        payload: dict[str, Any] = {"query": query, "limit": limit}
        if session_id:
            payload["session_id"] = session_id
        async with self._credential_client(credential) as client:
            response = await client.post("/api/v1/search/search", json=payload)
            response.raise_for_status()
            return response.json()

    def _credential_client(self, credential: OpenVikingCredential | str) -> httpx.AsyncClient:
        if isinstance(credential, str):
            return self._client(credential)
        headers = {}
        if credential.account_id:
            headers["X-OpenViking-Account"] = credential.account_id
        if credential.user_id:
            headers["X-OpenViking-User"] = credential.user_id
        return self._client(credential.api_key, headers)

    def _client(self, api_key: str, extra_headers: dict[str, str] | None = None) -> httpx.AsyncClient:
        headers = {"X-API-Key": api_key, "Content-Type": "application/json"}
        if extra_headers:
            headers.update(extra_headers)
        return httpx.AsyncClient(
            base_url=self.base_url,
            headers=headers,
            timeout=self.timeout,
            verify=self.verify_ssl,
        )

    def _extract_user_key(self, data: dict[str, Any]) -> str | None:
        result = data.get("result") if isinstance(data.get("result"), dict) else data
        value = result.get("user_key") if isinstance(result, dict) else None
        return str(value) if value else None


class EverOSMemorySystemClient:
    def __init__(self) -> None:
        config = get_config()
        self.base_url = config.everos.url.rstrip("/")
        self.api_key = config.everos.api_key
        self.timeout = config.everos.timeout
        self.verify_ssl = config.everos.verify_ssl
        self.health_path = config.everos.health_path

    async def health(self) -> dict[str, Any]:
        async with self._client() as client:
            response = await client.get(self.health_path)
            response.raise_for_status()
            return response.json()

    async def append_message(self, user_id: str, session_id: str, role: str, content: str) -> dict[str, Any]:
        async with self._client() as client:
            response = await client.post(
                "/api/v1/memories",
                json=self.build_message_payload(user_id=user_id, session_id=session_id, role=role, content=content),
            )
            response.raise_for_status()
            return response.json()

    def build_message_payload(self, user_id: str, session_id: str, role: str, content: str) -> dict[str, Any]:
        everos_role = "assistant" if role == "assistant" else "user"
        sender_id = "assistant" if everos_role == "assistant" else user_id
        timestamp = int(datetime.now(timezone.utc).timestamp() * 1000)
        return {
            "user_id": user_id,
            "session_id": session_id,
            "messages": [
                {
                    "message_id": f"msg_{timestamp}",
                    "timestamp": timestamp,
                    "sender_id": sender_id,
                    "sender_name": sender_id,
                    "role": everos_role,
                    "content": content,
                }
            ],
        }

    async def flush(self, user_id: str, session_id: str) -> dict[str, Any]:
        async with self._client() as client:
            response = await client.post("/api/v1/memories/flush", json={"user_id": user_id, "session_id": session_id})
            response.raise_for_status()
            return response.json()

    async def search(self, user_id: str, session_id: str | None, query: str, method: str, limit: int) -> dict[str, Any]:
        filters: dict[str, Any] = {"user_id": user_id}
        if session_id:
            filters["session_id"] = session_id
        async with self._client() as client:
            response = await client.post(
                "/api/v1/memories/search",
                json={
                    "query": query,
                    "method": method,
                    "memory_types": ["episodic_memory", "profile", "raw_message"],
                    "filters": filters,
                    "top_k": limit,
                    "include_original_data": True,
                },
            )
            response.raise_for_status()
            return response.json()

    async def get_profile(self, user_id: str) -> dict[str, Any]:
        async with self._client() as client:
            response = await client.post(
                "/api/v1/memories/get",
                json={
                    "memory_type": "profile",
                    "filters": {"user_id": user_id},
                    "page": 1,
                    "page_size": 20,
                },
            )
            response.raise_for_status()
            return response.json()

    def _client(self) -> httpx.AsyncClient:
        headers = {"Content-Type": "application/json"}
        if self.api_key:
            headers["X-API-Key"] = self.api_key
            headers["Authorization"] = f"Bearer {self.api_key}"
        return httpx.AsyncClient(
            base_url=self.base_url,
            headers=headers,
            timeout=self.timeout,
            verify=self.verify_ssl,
        )