import { Enum, Option, Struct, Vec } from "@polkadot/types/codec";
import { getTypeRegistry, Text } from "@polkadot/types";
import { BlockNumber, AccountId, Balance, Hash } from "@polkadot/types/interfaces";
import { u32, bool } from "@polkadot/types/primitive";
import { Codec } from "@polkadot/types/types";

import { registerForumTypes } from "./forum";
import { registerMediaTypes } from "./media";
import { registerMembershipTypes } from "./members";
import { registerRolesTypes } from "./roles";
import { registerDiscoveryTypes } from "./discovery";
import { registerHiringTypes } from "./hiring";
import { registerVersionedStoreTypes } from "./versioned-store";
import { registerVersionedStorePermissionsTypes } from "./versioned-store/permissions";
import { registerStakeTypes } from "./stake";
import { registerMintTypes } from "./mint";
import { registerRecurringRewardsTypes } from "./recurring-rewards";
import { registerContentWorkingGroupTypes } from "./content-working-group";
import { registerProposalTypes, ProposalStatus } from "./proposals";

export function getTextPropAsString(struct: Struct, fieldName: string): string {
  return (struct.get(fieldName) as Text).toString();
}

export function getBoolPropAsBoolean(struct: Struct, fieldName: string): boolean {
  return (struct.get(fieldName) as bool).valueOf();
}

export function getOptionPropOrUndefined<T extends Codec>(struct: Struct, fieldName: string): T | undefined {
  return (struct.get(fieldName) as Option<T>).unwrapOr(undefined);
}

export class OptionText extends Option.with(Text) {
  static none(): OptionText {
    return new Option(Text, null);
  }

  static some(text: string): OptionText {
    return new Option(Text, text);
  }
}

export type TransferableStake = {
  seat: Balance;
  backing: Balance;
};

export type Stake = {
  new: Balance;
  transferred: Balance;
};

export type Backer = {
  member: AccountId;
  stake: Balance;
};

export type Seat = {
  member: AccountId;
  stake: Balance;
  backers: Backer[];
};

export type SealedVote = {
  voter: AccountId;
  commitment: Hash;
  stake: Stake;
  vote: Option<AccountId>;
};

export type ProposalVote = {
  voter: AccountId;
  kind: VoteKind;
};

export type TallyResult = {
  proposal_id: u32;
  abstentions: u32;
  approvals: u32;
  rejections: u32;
  slashes: u32;
  status: ProposalStatus;
  finalized_at: BlockNumber;
};

export class Announcing extends u32 {}
export class Voting extends u32 {}
export class Revealing extends u32 {}

export class ElectionStage extends Enum {
  constructor(value?: any, index?: number) {
    super(
      {
        Announcing,
        Voting,
        Revealing
      },
      value,
      index
    );
  }

  /** Create a new Announcing stage. */
  static Announcing(endsAt: BlockNumber | number): ElectionStage {
    return this.newElectionStage("Announcing", endsAt);
  }

  /** Create a new Voting stage. */
  static Voting(endsAt: BlockNumber | number): ElectionStage {
    return this.newElectionStage("Voting", endsAt);
  }

  /** Create a new Revealing stage. */
  static Revealing(endsAt: BlockNumber | number): ElectionStage {
    return this.newElectionStage("Revealing", endsAt);
  }

  static newElectionStage(stageName: string, endsAt: BlockNumber | number) {
    return new ElectionStage({ [stageName]: endsAt });
  }
}

export type AnyElectionStage = Announcing | Voting | Revealing;

export const VoteKinds: { [key: string]: string } = {
  Abstain: "Abstain",
  Approve: "Approve",
  Reject: "Reject",
  Slash: "Slash"
};

export class VoteKind extends Enum {
  constructor(value?: any) {
    super(["Abstain", "Approve", "Reject", "Slash"], value);
  }
}

export type ProposalVotes = [AccountId, VoteKind][];

// Treat a BTreeSet as a Vec since it is encoded in the same way.
export class BTreeSet<T extends Codec> extends Vec<T> {}

// TODO Refactor: split this function and move to corresponding modules: election and proposals.
function registerElectionAndProposalTypes() {
  try {
    const typeRegistry = getTypeRegistry();
    // Is this enough?
    typeRegistry.register({
      BTreeSet
    });

    typeRegistry.register({
      MemoText: "Text"
    });
    // Register parametrized enum ElectionStage:
    typeRegistry.register({
      ElectionStage
    });
    typeRegistry.register({
      ProposalStatus,
      VoteKind
    });
    typeRegistry.register({
      ElectionStake: {
        new: "Balance",
        transferred: "Balance"
      },
      SealedVote: {
        voter: "AccountId",
        commitment: "Hash",
        stake: "ElectionStake",
        vote: "Option<AccountId>"
      },
      TransferableStake: {
        seat: "Balance",
        backing: "Balance"
      },
      RuntimeUpgradeProposal: {
        id: "u32",
        proposer: "AccountId",
        stake: "Balance",
        name: "Text",
        description: "Text",
        wasm_hash: "Hash",
        proposed_at: "BlockNumber",
        status: "ProposalStatus"
      },
      "TallyResult<BlockNumber>": {
        proposal_id: "u32",
        abstentions: "u32",
        approvals: "u32",
        rejections: "u32",
        slashes: "u32",
        status: "ProposalStatus",
        finalized_at: "BlockNumber"
      },
      ElectionParameters: {
        announcing_period: "BlockNumber",
        voting_period: "BlockNumber",
        revealing_period: "BlockNumber",
        council_size: "u32",
        candidacy_limit: "u32",
        new_term_duration: "BlockNumber",
        min_council_stake: "Balance",
        min_voting_stake: "Balance"
      }
    });
  } catch (err) {
    console.error("Failed to register custom types of Joystream node", err);
  }
}

export function registerJoystreamTypes() {
  registerMembershipTypes();
  registerRolesTypes();
  registerMediaTypes();
  registerForumTypes();
  registerElectionAndProposalTypes();
  registerDiscoveryTypes();
  registerVersionedStoreTypes();
  registerVersionedStorePermissionsTypes();
  registerStakeTypes();
  registerMintTypes();
  registerRecurringRewardsTypes();
  registerHiringTypes();
  registerContentWorkingGroupTypes();
  registerProposalTypes();
  require("./bureaucracy").registerBureaucracyTypes();
}