"""
Rewards API - variable reward system for routine completion
"""

import os
import uuid
import random
import flask
import jwt
import core.auth as auth
import core.postgres as postgres


def _get_user_uuid(token):
    try:
        payload = jwt.decode(token, os.getenv("JWT_SECRET"), algorithms=["HS256"])
        return payload.get("sub")
    except (jwt.ExpiredSignatureError, jwt.InvalidTokenError):
        return None


def _auth(request):
    header = request.headers.get("Authorization", "")
    if not header.startswith("Bearer "):
        return None
    token = header[7:]
    user_uuid = _get_user_uuid(token)
    if not user_uuid or not auth.verifyLoginToken(token, userUUID=user_uuid):
        return None
    return user_uuid


def register(app):

    @app.route("/api/rewards/random", methods=["GET"])
    def api_getRandomReward():
        """Get a weighted random reward. Query: ?context=completion"""
        user_uuid = _auth(flask.request)
        if not user_uuid:
            return flask.jsonify({"error": "unauthorized"}), 401

        context = flask.request.args.get("context", "completion")

        # Fetch all rewards from pool
        all_rewards = postgres.select("reward_pool", where={})
        if not all_rewards:
            return flask.jsonify({"reward": None}), 200

        # Weight by rarity: common=70%, uncommon=25%, rare=5%
        weights = {
            "common": 70,
            "uncommon": 25,
            "rare": 5,
        }
        weighted = []
        for reward in all_rewards:
            w = weights.get(reward.get("rarity", "common"), 70)
            weighted.extend([reward] * w)

        if not weighted:
            return flask.jsonify({"reward": None}), 200

        selected = random.choice(weighted)

        # Record that user earned this reward
        try:
            postgres.insert("user_rewards", {
                "id": str(uuid.uuid4()),
                "user_uuid": user_uuid,
                "reward_id": selected["id"],
                "context": context,
            })
        except Exception:
            pass  # Don't fail if recording fails

        return flask.jsonify({
            "reward": {
                "id": selected["id"],
                "category": selected["category"],
                "content": selected["content"],
                "emoji": selected.get("emoji"),
                "rarity": selected.get("rarity", "common"),
            }
        }), 200

    @app.route("/api/rewards/history", methods=["GET"])
    def api_getRewardHistory():
        """Get user's past earned rewards."""
        user_uuid = _auth(flask.request)
        if not user_uuid:
            return flask.jsonify({"error": "unauthorized"}), 401

        earned = postgres.select(
            "user_rewards",
            where={"user_uuid": user_uuid},
            order_by="earned_at DESC",
            limit=50,
        )

        # Enrich with reward content
        result = []
        for entry in earned:
            reward = postgres.select_one("reward_pool", {"id": entry["reward_id"]})
            if reward:
                result.append({
                    "earned_at": entry["earned_at"],
                    "context": entry.get("context"),
                    "category": reward["category"],
                    "content": reward["content"],
                    "emoji": reward.get("emoji"),
                    "rarity": reward.get("rarity"),
                })

        return flask.jsonify(result), 200