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

// types
import { Bounty, CacheEvent, WorkerReward, SpendingProposal } 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 {
  Proposal,
  ProposalId,
  SpendingParams,
} from "@joystream/types/proposals";
import { ProposalDetails, ProposalOf } from "@joystream/types/augment/types";
import { Stake } from "@joystream/types/stake";
import {
  RewardRelationship,
  RewardRelationshipId,
} from "@joystream/types/recurring-rewards";

// lib
import { getPercent, getTotalMinted } from "./";
import {
  getBlock,
  getBlockHash,
  getMint,
  getNextWorker,
  getMember,
  getWorker,
  getWorkerReward,
  getProposalInfo,
  getProposalDetails,
  getStake,
  getValidators,
  getValidatorCount,
} from "./api";
import { WorkerOf } from "@joystream/types/augment-codec/all";
import { ProposalDetailsOf } from "@joystream/types/augment/types";

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

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);

    const account = worker.role_account_id as AccountId;
    const memberId = worker.member_id;
    const member: Membership = await getMember(api, memberId, hash);
    const handle = member ? String(member.handle) : account.toString();
    const status = worker.is_active ? `active` : `inactive`;

    // fetch reward and stake
    const w: WorkerReward = { id, status, handle, account, memberId };
    if (worker.role_stake_profile.isSome) {
      const roleStakeProfile = worker.role_stake_profile.unwrap();
      w.stake = await getStake(api, roleStakeProfile.stake_id);
    }

    if (worker.reward_relationship.isSome) {
      const id: RewardRelationshipId = worker.reward_relationship.unwrap();
      w.reward = await getWorkerReward(api, hash, id);
    }
    workers.push(w);
  }
  return workers;
};

export const getWorkerRow = (
  worker: WorkerReward,
  earnedStart: number
): string => {
  const mtjoy = (mtjoy: number): string => (mtjoy / 1000000).toFixed(1);

  const { id, memberId, account, handle, status, reward } = worker;
  if (!reward) return ``;
  const earnedEnd = Number(reward.total_reward_received.toBigInt());
  if (!earnedEnd) return ``;
  const totalEarned = mtjoy(earnedEnd);
  const earnedTerm = mtjoy(earnedEnd - earnedStart);
  const amount = Number(reward.amount_per_payout.toBigInt());
  const rewardPerBlock = (amount / Number(reward.payout_interval)).toFixed();
  const url = `https://pioneer.joystreamstats.live/#/members/${handle}`; // TODO
  return `| ${id} | [@${handle}](${url}) | ${status} | ${rewardPerBlock} | ${earnedTerm} | ${totalEarned} |\n`;
};

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 getFinalizedSpendingProposals = async (
  api: ApiPromise,
  blocks: [number, CacheEvent[]][]
): Promise<SpendingProposal[]> => {
  let spendingProposals: SpendingProposal[] = [];
  await blocks.forEach(([key, proposals]) =>
    proposals.forEach(async (proposalEvent) => {
      let statusUpdateData = proposalEvent.data[1] as any;
      const finalizedAt = statusUpdateData.finalized.finalizedAt;
      if (!(statusUpdateData.finalized && finalizedAt)) return;

      const proposalId = proposalEvent.data[0] as ProposalId;
      const id = +proposalId;
      const proposalInfo: ProposalOf = await getProposalInfo(api, proposalId);
      const finalizedData = proposalInfo.status.asFinalized;
      const details: ProposalDetailsOf = await getProposalDetails(
        api,
        proposalId
      );
      if (!finalizedData.proposalStatus.isApproved || !details.isSpending)
        return;
      let approvedData = finalizedData.proposalStatus.asApproved;
      if (!approvedData.isExecuted) return;
      if (!spendingProposals.some((proposal) => proposal.id === id)) {
        const title = proposalInfo.title.toString();
        const amount = +details.asSpending[0];
        spendingProposals.push({ id, title, amount });
      }
    })
  );
  return spendingProposals;
};

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[] = [];
  while (!activeValidators.length) {
    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;
  }
  return activeValidators;
};