"""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 = {'ticket': {'subject': 'Duplicate subscription charge', 'message': 'I was charged twice this month. Please refund the duplicate before Friday.'}, 'customer_plan': 'pro'}
QUESTIONS = {'department': {'type': 'choice', 'instructions': 'Which team should handle this ticket?', 'criteria': {'billing': 'Payments and refunds', 'technical': 'Bugs and outages', 'sales': 'New purchases', 'other': 'No listed category fits'}}, 'urgency': {'type': 'score', 'instructions': 'How urgent is the request?', 'criteria': ['No deadline', 'This week', 'Within one day', 'Immediate harm']}, 'refund_requested': {'type': 'noul', 'instructions': 'Does the customer explicitly request a refund?'}, 'churn_risk': {'type': 'noul', 'instructions': 'Does the customer explicitly threaten cancellation?'}}
FIXTURE = {'department': {'type': 'choice', 'choice': 'billing', 'confidence': 0.9, 'probabilities': {'billing': 0.925, 'technical': 0.024999999999999984, 'sales': 0.024999999999999984, 'other': 0.024999999999999984}}, 'urgency': {'type': 'score', 'score': 1.8, 'confidence': 0.9, 'legend': {'0': 'No deadline', '1': 'This week', '2': 'Within one day', '3': 'Immediate harm'}, 'probabilities': {'0': 0, '1': 0.19999999999999996, '2': 0.8, '3': 0}}, 'refund_requested': {'type': 'noul', 'noul': 0.97}, 'churn_risk': {'type': 'noul', 'noul': 0.1}}

def decide(answers, state):
    department = answers["department"]
    queue = department["choice"] if department["confidence"] >= .85 else "manual_review"
    return {"queue": queue,
            "priority_review": answers["urgency"]["score"] >= 2,
            "refund_workflow_flag": answers["refund_requested"]["noul"] >= .8,
            "retention_review": answers["churn_risk"]["noul"] >= .8,
            "refund_executed": False}

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()