"""Exec approval for Synology Chat channel.

Provides approval workflow for privileged operations in the Synology Chat context.
"""

from __future__ import annotations

import uuid
from typing import Any

from yuxi.utils.logging_config import logger


class ApprovalManager:
    def __init__(self, config: dict[str, Any]):
        self._config = config
        self._approvers: list[str] = config.get("security", {}).get("approvers", [])
        self._pending_approvals: dict[str, dict[str, Any]] = {}

    def get_approvers(self) -> list[str]:
        return list(self._approvers)

    def is_approver(self, user_id: str) -> bool:
        return user_id in self._approvers

    def request_approval(
        self,
        action: str,
        requester_id: str,
        details: dict[str, Any] | None = None,
    ) -> dict[str, Any]:
        request_id = f"approval:{action}:{requester_id}:{uuid.uuid4().hex[:12]}"
        self._pending_approvals[request_id] = {
            "request_id": request_id,
            "action": action,
            "requester_id": requester_id,
            "status": "pending",
            "details": details or {},
        }
        logger.info(f"[SynologyChat] Approval requested: {action} by {requester_id}")
        return {"request_id": request_id, "status": "pending"}

    def approve(self, request_id: str, approver_id: str) -> dict[str, Any]:
        if not self.is_approver(approver_id):
            return {"status": "error", "message": f"User {approver_id} is not an approver"}
        if request_id not in self._pending_approvals:
            return {"status": "error", "message": f"Approval request {request_id} not found"}
        self._pending_approvals[request_id]["status"] = "approved"
        self._pending_approvals[request_id]["approved_by"] = approver_id
        logger.info(f"[SynologyChat] Approval {request_id} approved by {approver_id}")
        return {"request_id": request_id, "status": "approved"}

    def deny(self, request_id: str, approver_id: str, reason: str = "") -> dict[str, Any]:
        if not self.is_approver(approver_id):
            return {"status": "error", "message": f"User {approver_id} is not an approver"}
        if request_id not in self._pending_approvals:
            return {"status": "error", "message": f"Approval request {request_id} not found"}
        self._pending_approvals[request_id]["status"] = "denied"
        self._pending_approvals[request_id]["denied_by"] = approver_id
        self._pending_approvals[request_id]["deny_reason"] = reason
        logger.info(f"[SynologyChat] Approval {request_id} denied by {approver_id}: {reason}")
        return {"request_id": request_id, "status": "denied"}

    def get_pending(self) -> list[dict[str, Any]]:
        return [r for r in self._pending_approvals.values() if r["status"] == "pending"]