from __future__ import annotations

from typing import Any

from yuxi.utils.logging_config import logger


class ExecApprovalRequest:
    def __init__(
        self,
        request_id: str,
        command: str,
        room_id: str,
        requester_id: str,
        metadata: dict[str, Any] | None = None,
    ):
        self.request_id = request_id
        self.command = command
        self.room_id = room_id
        self.requester_id = requester_id
        self.status = "pending"
        self.metadata = metadata or {}
        self.approver_id: str = ""
        self.result: str = ""

    def approve(self, approver_id: str) -> None:
        self.status = "approved"
        self.approver_id = approver_id

    def deny(self, approver_id: str) -> None:
        self.status = "denied"
        self.approver_id = approver_id

    def allow_once(self, approver_id: str) -> None:
        self.status = "approved"
        self.approver_id = approver_id
        self.result = "allow-once"

    @property
    def is_resolved(self) -> bool:
        return self.status in ("approved", "denied")


_REACTION_SHORTCUTS = {
    "\u2705": "allow-once",
    "\u274c": "deny",
    "\u2714\ufe0f": "allow-once",
    "\u2714": "allow-once",
    "\u274e": "deny",
}


class ExecApprovalManager:
    def __init__(self, config: dict[str, Any]):
        self._config = config
        approvals_cfg = config.get("execApprovals", {})
        enabled_raw = approvals_cfg.get("enabled", "auto")
        self._enabled = enabled_raw != "false" and enabled_raw is not False
        self._approvers: list[str] = approvals_cfg.get("approvers", [])
        self._target = approvals_cfg.get("target", "dm")
        self._agent_filter: list[str] = approvals_cfg.get("agentFilter", [])
        self._session_filter: list[str] = approvals_cfg.get("sessionFilter", [])
        self._pending: dict[str, ExecApprovalRequest] = {}

    def requires_approval(self, room_id: str, command: str, session_id: str = "") -> bool:
        if not self._enabled:
            return False

        if self._agent_filter and session_id not in self._agent_filter:
            return False

        return True

    def is_approver(self, user_id: str) -> bool:
        if not self._approvers:
            return True
        return user_id in self._approvers

    def create_request(
        self,
        request_id: str,
        command: str,
        room_id: str,
        requester_id: str,
    ) -> ExecApprovalRequest:
        request = ExecApprovalRequest(
            request_id=request_id,
            command=command,
            room_id=room_id,
            requester_id=requester_id,
        )
        self._pending[request_id] = request
        logger.info(f"Matrix exec approval requested: {request_id} ({command})")
        return request

    def handle_reaction(self, user_id: str, emoji: str, request_id: str) -> str | None:
        if not self.is_approver(user_id):
            return None

        action = _REACTION_SHORTCUTS.get(emoji)
        if not action:
            return None

        request = self._pending.get(request_id)
        if not request:
            return None

        if action == "allow-once":
            request.allow_once(user_id)
            logger.info(f"Matrix exec approved (once) by {user_id}: {request_id}")
        elif action == "deny":
            request.deny(user_id)
            logger.info(f"Matrix exec denied by {user_id}: {request_id}")

        return action

    def approve_request(self, user_id: str, request_id: str) -> bool:
        if not self.is_approver(user_id):
            return False
        request = self._pending.get(request_id)
        if not request:
            return False
        request.approve(user_id)
        return True

    def deny_request(self, user_id: str, request_id: str) -> bool:
        if not self.is_approver(user_id):
            return False
        request = self._pending.get(request_id)
        if not request:
            return False
        request.deny(user_id)
        return True

    def get_pending(self) -> list[ExecApprovalRequest]:
        return [r for r in self._pending.values() if r.status == "pending"]

    def clear_resolved(self) -> None:
        resolved = [k for k, v in self._pending.items() if v.is_resolved]
        for key in resolved:
            del self._pending[key]

    @property
    def enabled(self) -> bool:
        return self._enabled

    @property
    def pending_count(self) -> int:
        return len(self.get_pending())