import { ApiPromise } from "@polkadot/api";

// types
import { Bounty, CacheEvent, WorkerReward } from "./types";
import { AccountId, Balance } from "@polkadot/types/interfaces";
import { Hash } from "@polkadot/types/interfaces";
import { Membership } from "@joystream/types/members";
import { Mint, MintId } from "@joystream/types/mint";
import { Stake } from "@joystream/types/stake";
import { WorkerOf } from "@joystream/types/augment/all";
import {
  RewardRelationship,
  RewardRelationshipId,
} from "@joystream/types/recurring-rewards";

// lib
import { getPercent, getTotalMinted } from "./";
import {
  getBlock,
  getBlockHash,
  getMint,
  getNextWorker,
  getWorker,
  getWorkerReward,
  getStake,
  getValidators,
  getValidatorCount,
} from "./api";

export const filterMethods = {
  getBurnedTokens: ({ section, method }: CacheEvent) =>
    section === "balances" && method === "Transfer",
  newValidatorsRewards: ({ section, method }: CacheEvent) =>
    section === "staking" && method === "Reward",
};

export const getWorkerRewards = async (
  api: ApiPromise,
  group: string,
  hash: Hash
): Promise<WorkerReward[]> => {
  let workers = Array<WorkerReward>();
  const nextWorkerId = await getNextWorker(api, group, hash);

  for (let id = 0; id < nextWorkerId; ++id) {
    const worker: WorkerOf = await getWorker(api, group, hash, id);

    // TODO workers fired before the end will be missed out
    if (!worker.is_active) continue;
    let stake: Stake, reward: RewardRelationship;

    if (worker.role_stake_profile.isSome) {
      const roleStakeProfile = worker.role_stake_profile.unwrap();
      stake = await getStake(api, roleStakeProfile.stake_id);
    }

    if (worker.reward_relationship.isSome) {
      // TODO changing salaries are not reflected
      const rewardId: RewardRelationshipId = worker.reward_relationship.unwrap();
      reward = await getWorkerReward(api, hash, rewardId);
    }
    workers.push({ id, stake, reward });
  }
  return workers;
};

export const getBurnedTokens = (
  burnAddress: string,
  blocks: [number, CacheEvent[]][]
): number => {
  let tokensBurned = 0;
  blocks.forEach(([key, transfers]) =>
    transfers.forEach((transfer) => {
      let receiver = transfer.data[1] as AccountId;
      let amount = transfer.data[2] as Balance;
      if (receiver.toString() === burnAddress) tokensBurned = Number(amount);
    })
  );
  return tokensBurned;
};

export const getValidatorsRewards = (
  blocks: [number, CacheEvent[]][]
): number => {
  let newValidatorRewards = 0;
  blocks.forEach(([key, validatorRewards]) =>
    validatorRewards.forEach(
      (reward: CacheEvent) => (newValidatorRewards += Number(reward.data[1]))
    )
  );
  return newValidatorRewards;
};

export const getActiveValidators = async (
  api: ApiPromise,
  hash: Hash,
  searchPreviousBlocks: boolean = false
): Promise<AccountId[]> => {
  const block = await getBlock(api, hash);
  let currentBlockNr = block.block.header.number.toNumber();
  let activeValidators: AccountId[];
  do {
    const hash: Hash = await getBlockHash(api, currentBlockNr);
    const validators: AccountId[] = await getValidators(api, hash);
    if (validators.length) {
      let max = await getValidatorCount(api, hash);
      activeValidators = validators.slice(0, max);
    }

    if (searchPreviousBlocks) --currentBlockNr;
    else ++currentBlockNr;
  } while (activeValidators == undefined);
  return activeValidators;
};