#!/usr/bin/env python3
"""Cost-first OpenAI-compatible model router with a macOS Keychain secret reference."""
from __future__ import annotations
import argparse, hashlib, json, subprocess
from pathlib import Path
import urllib.error, urllib.request
from typing import Any

ROOT=Path(__file__).resolve().parents[2]
CONFIG=ROOT/"routing/persona-model-api-smart-router-map.json"

class RouterError(RuntimeError): pass

def load(path: Path) -> dict[str,Any]:
    value=json.loads(path.read_text())
    if not isinstance(value,dict): raise RouterError("JSON_OBJECT_REQUIRED")
    return value

def keychain_secret(config: dict[str,Any]) -> str:
    p=config["provider"]
    result=subprocess.run(["security","find-generic-password","-a",p["keychain_account"],"-s",p["keychain_service"],"-w"],text=True,capture_output=True,timeout=10)
    if result.returncode or not result.stdout.strip(): raise RouterError("OPENLUX_KEYCHAIN_SECRET_UNAVAILABLE")
    return result.stdout.strip()

def request_json(url: str, key: str, payload: dict[str,Any]|None=None, timeout: int=45) -> dict[str,Any]:
    if not url.startswith("https://api.openlux.ai/v1/"): raise RouterError("PROVIDER_URL_NOT_ALLOWLISTED")
    body=None if payload is None else json.dumps(payload,ensure_ascii=False).encode()
    request=urllib.request.Request(url,data=body,method="GET" if body is None else "POST",headers={"Authorization":f"Bearer {key}","Content-Type":"application/json"})
    try:
        with urllib.request.urlopen(request,timeout=timeout) as response:
            value=json.loads(response.read())
    except urllib.error.HTTPError as error:
        raise RouterError(f"MODEL_HTTP_{error.code}") from error
    except Exception as error:
        raise RouterError(f"MODEL_TRANSPORT_{type(error).__name__}") from error
    if not isinstance(value,dict): raise RouterError("MODEL_RESPONSE_OBJECT_REQUIRED")
    return value

def available_models(config: dict[str,Any], key: str) -> set[str]:
    value=request_json(config["provider"]["base_url"]+"/models",key,timeout=20)
    return {x.get("id") for x in value.get("data",[]) if isinstance(x,dict) and isinstance(x.get("id"),str)}

def candidates(config: dict[str,Any], complexity: str, available: set[str]) -> list[str]:
    order=["LOW","MEDIUM","HIGH"]
    level=complexity if complexity in order else config["policy"]["default_complexity"]
    result=[]
    for tier in order[:order.index(level)+1]:
        result.extend(x for x in config["tiers"][tier] if x in available and x not in result)
    return result[:int(config["policy"]["max_attempts"])]

def route(event: dict[str,Any], config: dict[str,Any]|None=None, secret_reader=keychain_secret) -> dict[str,Any]:
    config=config or load(CONFIG)
    for field in config["identity_envelope_required"]:
        if not isinstance(event.get(field),str) or not event[field].strip(): raise RouterError(f"IDENTITY_ENVELOPE_REQUIRED:{field}")
    key=secret_reader(config)
    available=available_models(config,key)
    selected=candidates(config,event.get("complexity","LOW"),available)
    if not selected: raise RouterError("NO_CONFIGURED_MODEL_AVAILABLE")
    system=(f"你是{event['parent_persona_id']}人格系统内的子Agent {event['child_agent_id']}，岗位是{event['agent_role']}。"
            f"你的唯一父人格主控是{event['controller']}，当前频道{event['channel_id']}。权限仅为{event['authority']}。"
            "你必须理解后再协作，不能把宿主规则程序冒充人格，不能扩大权限，不能泄露私人数据。")
    attempts=[]
    for model in selected:
        try:
            response=request_json(config["provider"]["base_url"]+"/chat/completions",key,{"model":model,"stream":False,"temperature":0.2,"messages":[{"role":"system","content":system},{"role":"user","content":event["task"]}]})
            content=response.get("choices",[{}])[0].get("message",{}).get("content")
            if not isinstance(content,str) or not content.strip(): raise RouterError("MODEL_RESPONSE_EMPTY")
            return {"outcome":"PASS","router_id":config["router_id"],"selected_model":model,"attempts":[*attempts,{"model":model,"outcome":"PASS"}],"response":content,"response_sha256":hashlib.sha256(content.encode()).hexdigest(),"identity_bound":True,"credentials_stored":False,"authority_granted":False}
        except RouterError as error:
            attempts.append({"model":model,"outcome":"FAIL","error_code":str(error)})
    raise RouterError("ALL_COST_ORDERED_MODELS_FAILED:"+",".join(x["model"] for x in attempts))

def main() -> int:
    p=argparse.ArgumentParser(); p.add_argument("command",choices=("probe","route")); p.add_argument("--input"); a=p.parse_args()
    try:
        config=load(CONFIG)
        if a.command=="probe":
            key=keychain_secret(config); models=available_models(config,key); chosen=candidates(config,"LOW",models)
            result={"outcome":"PASS","router_id":config["router_id"],"provider":config["provider"]["id"],"available_model_count":len(models),"low_cost_candidates":chosen,"keychain_reference":True,"secret_exposed":False}
        else:
            if not a.input: raise RouterError("INPUT_REQUIRED")
            result=route(load(Path(a.input)),config)
        print(json.dumps(result,ensure_ascii=False,indent=2,sort_keys=True)); return 0
    except Exception as error:
        print(json.dumps({"outcome":"FAIL","error":str(error),"secret_exposed":False},ensure_ascii=False)); return 2

if __name__=="__main__": raise SystemExit(main())