// src/tasks/consolidate_twitch_channel_rewards.ts

import type { Task, Helpers } from "graphile-worker";
import { PrismaClient, User, type Pick } from '../../generated/prisma';
import { withAccelerate } from "@prisma/extension-accelerate";
import { env } from "../config/env";
import { constants } from "../config/constants";
import { getRateLimiter } from "../utils/rateLimiter";

const prisma = new PrismaClient().$extends(withAccelerate());
const cprPath = env.TWITCH_MOCK ? constants.twitch.dev.paths.channelPointRewards : constants.twitch.prod.paths.channelPointRewards;

interface Payload {
    userId: number;
}

export interface TwitchChannelPointReward {
    id: string;
    broadcaster_id: string;
    cost: number;
    title: string;
    is_in_stock: boolean;
    [key: string]: any;
}

const getAuthToken = (user: User) => env.TWITCH_MOCK ? env.TWITCH_MOCK_USER_ACCESS_TOKEN : user.twitchToken?.accessToken;


function assertPayload(payload: any): asserts payload is Payload {
    if (typeof payload !== "object" || !payload) throw new Error("invalid payload");
    if (typeof payload.userId !== "number") throw new Error("invalid payload.userId");
}


const getTwitchChannelPointRewards = async (user: User) => {
    if (!user?.twitchToken) throw new Error("Missing Twitch token");

    const authToken = getAuthToken(user);
    const limiter = getRateLimiter();
    await limiter.consume('twitch', 1);

    const query = new URLSearchParams({ broadcaster_id: user.twitchId });
    const res = await fetch(`${env.TWITCH_API_ORIGIN}${cprPath}?${query}`, {
        headers: {
            'Authorization': `Bearer ${authToken}`,
            'Client-Id': env.TWITCH_CLIENT_ID
        }
    });

    if (!res.ok) throw new Error(`Failed to fetch rewards: ${res.statusText}`);
    return res.json();
};

const createTwitchReward = async (user: User, pick: Pick) => {
    const authToken = getAuthToken(user);
    const limiter = getRateLimiter();
    await limiter.consume('twitch', 1);
    console.log('pick as follows')
    console.log(pick)

    console.log(`pick?.waifu?.name=${pick?.waifu?.name}`)

    const query = new URLSearchParams({ broadcaster_id: user.twitchId });
    const res = await fetch(`${env.TWITCH_API_ORIGIN}${cprPath}?${query}`, {
        method: 'POST',
        headers: {
            'Authorization': `Bearer ${authToken}`,
            'Client-Id': env.TWITCH_CLIENT_ID
        },
        body: JSON.stringify({ cost: user.redeemCost, title: pick.waifu.name })
    });

    if (!res.ok) throw new Error(`Failed to create reward: ${res.statusText}`);

    const data = await res.json();
    const rewardId = data.data?.[0]?.id;
    if (!rewardId) throw new Error("No reward ID returned");

    await prisma.pick.update({
        where: { id: pick.id },
        data: { twitchChannelPointRewardId: rewardId }
    });
};

const deleteTwitchReward = async (user: User, rewardId: string) => {
    const authToken = getAuthToken(user);
    const limiter = getRateLimiter();
    await limiter.consume('twitch', 1);

    const query = new URLSearchParams({ broadcaster_id: user.twitchId, id: rewardId });
    const res = await fetch(`${env.TWITCH_API_ORIGIN}${cprPath}?${query}`, {
        method: 'DELETE',
        headers: {
            'Authorization': `Bearer ${authToken}`,
            'Client-Id': env.TWITCH_CLIENT_ID
        }
    });

    if (!res.ok) throw new Error(`Failed to delete reward ${rewardId}`);
};

const updateTwitchReward = async (user: User, rewardId: string, newCost: number) => {
    const authToken = getAuthToken(user);
    const limiter = getRateLimiter();
    await limiter.consume('twitch', 1);

    const query = new URLSearchParams({ broadcaster_id: user.twitchId, id: rewardId });
    const res = await fetch(`${env.TWITCH_API_ORIGIN}${cprPath}?${query}`, {
        method: 'PATCH',
        headers: {
            'Authorization': `Bearer ${authToken}`,
            'Client-Id': env.TWITCH_CLIENT_ID
        },
        body: JSON.stringify({ cost: newCost })
    });

    if (!res.ok) throw new Error(`Failed to update reward ${rewardId}`);
};

const consolidateTwitchRewards = async (userId: number) => {
    const user = await prisma.user.findFirstOrThrow({
        where: { id: userId },
        include: { twitchToken: true, Waifu: true }
    });

    // Fetch picks (most recent N)
    const picks = await prisma.pick.findMany({
        where: { userId },
        orderBy: { createdAt: 'desc' },
        take: constants.twitch.maxChannelPointRewards,
        include: {
            waifu: true
        }
    });

    // Ensure every pick has a reward before processing Twitch side
    for (const pick of picks) {
        if (!pick.twitchChannelPointRewardId) {
            console.log(`Creating new reward for pick: ${pick.id}`);
            await createTwitchReward(user, pick);
        }
    }

    // Refresh picks after reward creation
    const updatedPicks = await prisma.pick.findMany({
        where: { userId },
        orderBy: { createdAt: 'desc' },
        take: constants.twitch.maxChannelPointRewards
    });

    // Get the most recent N reward IDs
    const currentPickIds = new Set(
        updatedPicks.slice(0, user.waifuChoicePoolSize).map(p => p.twitchChannelPointRewardId)
    );

    console.log('currentPickIds as follows');
    console.log(currentPickIds);

    // Fetch Twitch-side rewards
    const twitchData = await getTwitchChannelPointRewards(user);
    const twitchRewards: TwitchChannelPointReward[] = twitchData.data;

    // Delete or update Twitch rewards not in current pick set
    for (const reward of twitchRewards) {
        if (!updatedPicks.some(p => p.twitchChannelPointRewardId === reward.id)) continue;

        if (!currentPickIds.has(reward.id)) {
            console.log(`Deleting out-of-date reward: ${reward.id}`);
            await deleteTwitchReward(user, reward.id);
        } else if (reward.cost !== user.redeemCost) {
            console.log(`Updating reward cost for: ${reward.id}`);
            await updateTwitchReward(user, reward.id, user.redeemCost);
        }
    }
};


const task: Task = async (payload: any, helpers) => {
    assertPayload(payload);
    await consolidateTwitchRewards(payload.userId);
};

export default task;