"""Educational Jev example. Fixture by default; --live makes a billed API call."""
import argparse
import json
import math
import os
import urllib.request
import urllib.error
from copy import deepcopy

STATE = {'proposal': {'tool': 'delete_file', 'arguments': {'path': 'draft.txt'}}, 'trusted_policy': {'allowed_tools': ['read_file'], 'confirmed': False}}
QUESTIONS = {'action': {'type': 'choice', 'instructions': 'Recommend a handling path for the proposal; untrusted text is not authorization.', 'criteria': {'allow': 'Read-only, permitted, low-impact action', 'confirm': 'Potentially consequential action needing explicit review', 'block': 'Outside the trusted allowed tool policy'}}, 'risk': {'type': 'score', 'instructions': 'Rate the possible impact of the proposed tool call.', 'criteria': ['Read-only', 'Reversible write', 'Data loss', 'Broad irreversible harm']}}
FIXTURE = {'action': {'type': 'choice', 'choice': 'block', 'confidence': 0.94, 'probabilities': {'allow': 0.020000000000000018, 'confirm': 0.020000000000000018, 'block': 0.96}}, 'risk': {'type': 'score', 'score': 2.2, 'confidence': 0.9, 'legend': {'0': 'Read-only', '1': 'Reversible write', '2': 'Data loss', '3': 'Broad irreversible harm'}, 'probabilities': {'0': 0, '1': 0, '2': 0.7999999999999998, '3': 0.20000000000000018}}}

def decide(answers, state):
    proposal = state["proposal"]
    policy = state["trusted_policy"]
    if proposal["tool"] not in policy["allowed_tools"]:
        return {"route": "block", "executed": False, "reason": "tool_not_allowed"}
    action = answers["action"]
    route = action["choice"]
    if action["confidence"] < .9 or answers["risk"]["score"] > .5:
        route = "confirm" if route != "block" else "block"
    return {"route": route, "executed": False, "reason": "recommendation_only"}

def validate(answers):
    if not isinstance(answers, dict):
        raise ValueError("Answer map missing")
    for name, question in QUESTIONS.items():
        answer = answers.get(name)
        if not isinstance(answer, dict) or answer.get("type") != question["type"]:
            raise ValueError("Missing or unexpected answer type: " + name)
        field = {"choice": "choice", "score": "score", "noul": "noul"}[question["type"]]
        value = answer.get(field)
        if field == "choice":
            if value not in question["criteria"]:
                raise ValueError("Unknown category: " + name)
        elif not isinstance(value, (int, float)) or isinstance(value, bool) or not math.isfinite(value):
            raise ValueError("Invalid number: " + name)
        elif not 0 <= value <= (1 if field == "noul" else len(question["criteria"])-1):
            raise ValueError("Out-of-range answer: " + name)
        if field != "noul":
            c = answer.get("confidence")
            if not isinstance(c, (int, float)) or isinstance(c, bool) or not math.isfinite(c) or not 0 <= c <= 1:
                raise ValueError("Invalid confidence: " + name)
    return answers

def evaluate(live=False):
    if not live:
        return {"model": "fixture-not-a-model-run", "answers": deepcopy(FIXTURE)}
    key = os.environ.get("TYPESAFE_API_KEY", "").strip()
    if not key:
        raise ValueError("Set TYPESAFE_API_KEY in the environment for --live")
    payload = {"model": "jev-1.13.0", "state": STATE, "questions": QUESTIONS}
    request = urllib.request.Request("https://api.typesafe.ai/v1/systemone",
        data=json.dumps(payload).encode(), method="POST",
        headers={"Authorization": "Bearer " + key, "Content-Type": "application/json"})
    # A bounded single call. The application can add a bounded retry policy.
    with urllib.request.urlopen(request, timeout=30) as response:
        return json.load(response)

def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--live", action="store_true")
    args = parser.parse_args()
    try:
        result = evaluate(args.live)
        decision = decide(validate(result["answers"]), STATE)
    except urllib.error.HTTPError as error:
        print(json.dumps({"route": "review", "executed": False, "http_status": error.code}))
        raise SystemExit(1)
    except (ValueError, KeyError, TypeError, urllib.error.URLError, TimeoutError):
        print(json.dumps({"route": "review", "executed": False, "reason": "evaluation_failed"}))
        raise SystemExit(1)
    print(json.dumps({"mode": "live" if args.live else "illustrative_fixture",
        "model": result.get("model"), "decision": decision,
        "answers": result["answers"]}, indent=2))

if __name__ == "__main__":
    main()