"""Configuration loader for the Matrix Bridge.

Loads settings from config.json and provides typed access via dataclasses.
"""

from __future__ import annotations

import json
import os
from dataclasses import dataclass, field
from typing import Optional


DEFAULT_CONFIG_PATH = os.path.join(os.path.dirname(__file__), "config.json")


@dataclass
class MatrixConfig:
    server: str
    user_id: str
    room_id: str
    credentials_file: str


@dataclass
class AgentConfig:
    base_url: str


@dataclass
class BridgeConfig:
    poll_interval_seconds: int = 1
    state_file: str = "/home/admin/agent-dir/bridge-state.json"
    matrix_poll_timeout: int = 0
    agent_timeout_seconds: int = 30
    agent_retries: int = 3
    max_message_length: int = 40000
    processed_ids_limit: int = 200
    agent_response_timeout: int = 300
    api_host: str = "127.0.0.1"
    api_port: int = 8082


@dataclass
class Config:
    matrix: MatrixConfig
    agent: AgentConfig
    bridge: BridgeConfig = field(default_factory=BridgeConfig)

    @classmethod
    def load(cls, path: str = DEFAULT_CONFIG_PATH) -> "Config":
        """Load configuration from a JSON file."""
        with open(path, "r") as f:
            data = json.load(f)

        matrix = MatrixConfig(**data.get("matrix", {}))
        agent = AgentConfig(**data.get("agent", {}))
        bridge_data = data.get("bridge", {})
        bridge = BridgeConfig(**bridge_data)

        return cls(matrix=matrix, agent=agent, bridge=bridge)