import {ContainerType, Type, ValueOf} from "@chainsafe/ssz";
import {ChainForkConfig} from "@lodestar/config";
import {
  ForkPostDeneb,
  ForkPostGloas,
  ForkPreDeneb,
  VALIDATOR_REGISTRY_LIMIT,
  isForkPostDeneb,
  isForkPostElectra,
} from "@lodestar/params";
import {
  ArrayOf,
  Attestation,
  BLSSignature,
  BeaconBlock,
  BlindedBeaconBlock,
  BlockContents,
  CommitteeIndex,
  Epoch,
  ProducedBlockSource,
  Root,
  Slot,
  UintBn64,
  ValidatorIndex,
  altair,
  gloas,
  phase0,
  ssz,
  sszTypesFor,
  stringType,
} from "@lodestar/types";
import {fromHex, toHex, toRootHex} from "@lodestar/utils";
import {
  EmptyMeta,
  EmptyMetaCodec,
  EmptyResponseCodec,
  EmptyResponseData,
  JsonOnlyReq,
  WithVersion,
} from "../../utils/codecs.js";
import {getPostBellatrixForkTypes, getPostGloasForkTypes, toForkName} from "../../utils/fork.js";
import {fromHeaders} from "../../utils/headers.js";
import {Endpoint, RouteDefinitions, Schema} from "../../utils/index.js";
import {
  ExecutionOptimisticAndDependentRootCodec,
  ExecutionOptimisticAndDependentRootMeta,
  ExecutionOptimisticCodec,
  ExecutionOptimisticMeta,
  MetaHeader,
  VersionCodec,
  VersionMeta,
  VersionType,
} from "../../utils/metadata.js";
import {fromGraffitiHex, toBoolean, toGraffitiHex} from "../../utils/serdes.js";
import {WireFormat} from "../../utils/wireFormat.js";

export enum BuilderSelection {
  Default = "default",
  BuilderAlways = "builderalways",
  ExecutionAlways = "executionalways",
  MaxProfit = "maxprofit",
  /** Only activate builder flow for DVT block proposal protocols */
  BuilderOnly = "builderonly",
  /** Only builds execution block*/
  ExecutionOnly = "executiononly",
}

/** Lodestar-specific (non-standardized) options */
export type ExtraProduceBlockOpts = {
  feeRecipient?: string;
  builderSelection?: BuilderSelection;
  strictFeeRecipientCheck?: boolean;
  blindedLocal?: boolean;
};

export const ProduceBlockV3MetaType = new ContainerType(
  {
    ...VersionType.fields,
    /** Specifies whether the response contains full or blinded block */
    executionPayloadBlinded: ssz.Boolean,
    /** Execution payload value in Wei */
    executionPayloadValue: ssz.UintBn64,
    /** Consensus rewards paid to the proposer for this block, in Wei */
    consensusBlockValue: ssz.UintBn64,
  },
  {jsonCase: "eth2"}
);

export type ProduceBlockV3Meta = ValueOf<typeof ProduceBlockV3MetaType> & {
  /** Lodestar-specific (non-standardized) value */
  executionPayloadSource: ProducedBlockSource;
};

export const ProduceBlockV4MetaType = new ContainerType(
  {
    ...VersionType.fields,
    /** Consensus rewards paid to the proposer for this block, in Wei */
    consensusBlockValue: ssz.UintBn64,
  },
  {jsonCase: "eth2"}
);

export type ProduceBlockV4Meta = ValueOf<typeof ProduceBlockV4MetaType>;

export const AttesterDutyType = new ContainerType(
  {
    /** The validator's public key, uniquely identifying them */
    pubkey: ssz.BLSPubkey,
    /** Index of validator in validator registry */
    validatorIndex: ssz.ValidatorIndex,
    /** Index of the committee */
    committeeIndex: ssz.CommitteeIndex,
    /** Number of validators in committee */
    committeeLength: ssz.UintNum64,
    /** Number of committees at the provided slot */
    committeesAtSlot: ssz.UintNum64,
    /** Index of validator in committee */
    validatorCommitteeIndex: ssz.UintNum64,
    /** The slot at which the validator must attest */
    slot: ssz.Slot,
  },
  {jsonCase: "eth2"}
);

export const ProposerDutyType = new ContainerType(
  {
    slot: ssz.Slot,
    validatorIndex: ssz.ValidatorIndex,
    pubkey: ssz.BLSPubkey,
  },
  {jsonCase: "eth2"}
);

/**
 * From https://github.com/ethereum/beacon-APIs/pull/134
 */
export const SyncDutyType = new ContainerType(
  {
    pubkey: ssz.BLSPubkey,
    /** Index of validator in validator registry. */
    validatorIndex: ssz.ValidatorIndex,
    /** The indices of the validator in the sync committee. */
    validatorSyncCommitteeIndices: ArrayOf(ssz.CommitteeIndex),
  },
  {jsonCase: "eth2"}
);

export const BeaconCommitteeSubscriptionType = new ContainerType(
  {
    validatorIndex: ssz.ValidatorIndex,
    committeeIndex: ssz.CommitteeIndex,
    committeesAtSlot: ssz.Slot,
    slot: ssz.Slot,
    isAggregator: ssz.Boolean,
  },
  {jsonCase: "eth2"}
);

/**
 * From https://github.com/ethereum/beacon-APIs/pull/136
 */
export const SyncCommitteeSubscriptionType = new ContainerType(
  {
    validatorIndex: ssz.ValidatorIndex,
    syncCommitteeIndices: ArrayOf(ssz.CommitteeIndex),
    untilEpoch: ssz.Epoch,
  },
  {jsonCase: "eth2"}
);

export const ProposerPreparationDataType = new ContainerType(
  {
    validatorIndex: ssz.ValidatorIndex,
    feeRecipient: stringType,
  },
  {jsonCase: "eth2"}
);

/**
 * From https://github.com/ethereum/beacon-APIs/pull/224
 */
export const BeaconCommitteeSelectionType = new ContainerType(
  {
    /** Index of the validator */
    validatorIndex: ssz.ValidatorIndex,
    /** The slot at which a validator is assigned to attest */
    slot: ssz.Slot,
    /** The `slot_signature` calculated by the validator for the upcoming attestation slot */
    selectionProof: ssz.BLSSignature,
  },
  {jsonCase: "eth2"}
);

/**
 * From https://github.com/ethereum/beacon-APIs/pull/224
 */
export const SyncCommitteeSelectionType = new ContainerType(
  {
    /** Index of the validator */
    validatorIndex: ssz.ValidatorIndex,
    /** The slot at which validator is assigned to produce a sync committee contribution */
    slot: ssz.Slot,
    /** SubcommitteeIndex to which the validator is assigned */
    subcommitteeIndex: ssz.SubcommitteeIndex,
    /** The `slot_signature` calculated by the validator for the upcoming sync committee slot */
    selectionProof: ssz.BLSSignature,
  },
  {jsonCase: "eth2"}
);

export const LivenessResponseDataType = new ContainerType(
  {
    index: ssz.ValidatorIndex,
    isLive: ssz.Boolean,
  },
  {jsonCase: "eth2"}
);

export const ValidatorIndicesType = ArrayOf(ssz.ValidatorIndex);
export const AttesterDutyListType = ArrayOf(AttesterDutyType);
export const ProposerDutyListType = ArrayOf(ProposerDutyType);
export const SyncDutyListType = ArrayOf(SyncDutyType);
export const SignedAggregateAndProofListPhase0Type = ArrayOf(ssz.phase0.SignedAggregateAndProof);
export const SignedAggregateAndProofListElectraType = ArrayOf(ssz.electra.SignedAggregateAndProof);
export const SignedContributionAndProofListType = ArrayOf(ssz.altair.SignedContributionAndProof);
export const BeaconCommitteeSubscriptionListType = ArrayOf(BeaconCommitteeSubscriptionType);
export const SyncCommitteeSubscriptionListType = ArrayOf(SyncCommitteeSubscriptionType);
export const ProposerPreparationDataListType = ArrayOf(ProposerPreparationDataType);
export const BeaconCommitteeSelectionListType = ArrayOf(BeaconCommitteeSelectionType);
export const SyncCommitteeSelectionListType = ArrayOf(SyncCommitteeSelectionType);
export const LivenessResponseDataListType = ArrayOf(LivenessResponseDataType);
export const SignedValidatorRegistrationV1ListType = ArrayOf(
  ssz.bellatrix.SignedValidatorRegistrationV1,
  VALIDATOR_REGISTRY_LIMIT
);

export type ValidatorIndices = ValueOf<typeof ValidatorIndicesType>;
export type AttesterDuty = ValueOf<typeof AttesterDutyType>;
export type AttesterDutyList = ValueOf<typeof AttesterDutyListType>;
export type ProposerDuty = ValueOf<typeof ProposerDutyType>;
export type ProposerDutyList = ValueOf<typeof ProposerDutyListType>;
export type SyncDuty = ValueOf<typeof SyncDutyType>;
export type SyncDutyList = ValueOf<typeof SyncDutyListType>;
export type SignedAggregateAndProofListPhase0 = ValueOf<typeof SignedAggregateAndProofListPhase0Type>;
export type SignedAggregateAndProofListElectra = ValueOf<typeof SignedAggregateAndProofListElectraType>;
export type SignedAggregateAndProofList = SignedAggregateAndProofListPhase0 | SignedAggregateAndProofListElectra;
export type SignedContributionAndProofList = ValueOf<typeof SignedContributionAndProofListType>;
export type BeaconCommitteeSubscription = ValueOf<typeof BeaconCommitteeSubscriptionType>;
export type BeaconCommitteeSubscriptionList = ValueOf<typeof BeaconCommitteeSubscriptionListType>;
export type SyncCommitteeSubscription = ValueOf<typeof SyncCommitteeSubscriptionType>;
export type SyncCommitteeSubscriptionList = ValueOf<typeof SyncCommitteeSubscriptionListType>;
export type ProposerPreparationData = ValueOf<typeof ProposerPreparationDataType>;
export type ProposerPreparationDataList = ValueOf<typeof ProposerPreparationDataListType>;
export type BeaconCommitteeSelection = ValueOf<typeof BeaconCommitteeSelectionType>;
export type BeaconCommitteeSelectionList = ValueOf<typeof BeaconCommitteeSelectionListType>;
export type SyncCommitteeSelection = ValueOf<typeof SyncCommitteeSelectionType>;
export type SyncCommitteeSelectionList = ValueOf<typeof SyncCommitteeSelectionListType>;
export type LivenessResponseData = ValueOf<typeof LivenessResponseDataType>;
export type LivenessResponseDataList = ValueOf<typeof LivenessResponseDataListType>;
export type SignedValidatorRegistrationV1List = ValueOf<typeof SignedValidatorRegistrationV1ListType>;

export type Endpoints = {
  /**
   * Get attester duties
   * Requests the beacon node to provide a set of attestation duties, which should be performed by validators, for a particular epoch.
   * Duties should only need to be checked once per epoch, however a chain reorganization (of > MIN_SEED_LOOKAHEAD epochs) could occur, resulting in a change of duties. For full safety, you should monitor head events and confirm the dependent root in this response matches:
   * - event.previous_duty_dependent_root when `compute_epoch_at_slot(event.slot) == epoch`
   * - event.current_duty_dependent_root when `compute_epoch_at_slot(event.slot) + 1 == epoch`
   * - event.block otherwise
   * The dependent_root value is `get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch - 1) - 1)` or the genesis block root in the case of underflow.
   */
  getAttesterDuties: Endpoint<
    "POST",
    {
      /** Should only be allowed 1 epoch ahead */
      epoch: Epoch;
      /** An array of the validator indices for which to obtain the duties */
      indices: ValidatorIndices;
    },
    {params: {epoch: Epoch}; body: unknown},
    AttesterDutyList,
    ExecutionOptimisticAndDependentRootMeta
  >;

  /**
   * Get block proposers duties
   * Request beacon node to provide all validators that are scheduled to propose a block in the given epoch.
   * Duties should only need to be checked once per epoch, however a chain reorganization could occur that results in a change of duties. For full safety, you should monitor head events and confirm the dependent root in this response matches:
   * - event.current_duty_dependent_root when `compute_epoch_at_slot(event.slot) == epoch`
   * - event.block otherwise
   * The dependent_root value is `get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch) - 1)` or the genesis block root in the case of underflow.
   */
  getProposerDuties: Endpoint<
    "GET",
    {epoch: Epoch},
    {params: {epoch: Epoch}},
    ProposerDutyList,
    ExecutionOptimisticAndDependentRootMeta
  >;

  /**
   * Get block proposers duties
   * Request beacon node to provide all validators that are scheduled to propose a block in the given epoch.
   * Duties should only need to be checked once per epoch, however a chain reorganization could occur that results in a change of duties.
   * For full safety, you should monitor head events and confirm the dependent root in this response matches. After Fulu, different checks
   * need to be performed as the dependent root changes due to deterministic proposer lookahead.
   *
   * Before Fulu:
   *  - event.current_duty_dependent_root when `compute_epoch_at_slot(event.slot) == epoch`
   *  - event.block otherwise
   *  - dependent_root value is `get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch) - 1)`
   *
   * After Fulu:
   * - event.previous_duty_dependent_root when `compute_epoch_at_slot(event.slot) == epoch`
   * - event.block otherwise
   * - dependent_root value is `get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch - 1) - 1)`
   *
   * The dependent_root value is the genesis block root in the case of underflow."
   */
  getProposerDutiesV2: Endpoint<
    "GET",
    {epoch: Epoch},
    {params: {epoch: Epoch}},
    ProposerDutyList,
    ExecutionOptimisticAndDependentRootMeta
  >;

  getSyncCommitteeDuties: Endpoint<
    "POST",
    {
      epoch: number;
      indices: ValidatorIndices;
    },
    {params: {epoch: Epoch}; body: unknown},
    SyncDutyList,
    ExecutionOptimisticMeta
  >;

  /**
   * Requests a beacon node to produce a valid block, which can then be signed by a validator.
   * Metadata in the response indicates the type of block produced, and the supported types of block
   * will be added to as forks progress.
   */
  produceBlockV3: Endpoint<
    "GET",
    {
      /** The slot for which the block should be proposed */
      slot: Slot;
      /** The validator's randao reveal value */
      randaoReveal: BLSSignature;
      /** Arbitrary data validator wants to include in block */
      graffiti?: string;
      skipRandaoVerification?: boolean;
      builderBoostFactor?: UintBn64;
    } & ExtraProduceBlockOpts,
    {
      params: {slot: number};
      query: {
        randao_reveal: string;
        graffiti?: string;
        skip_randao_verification?: string;
        fee_recipient?: string;
        builder_selection?: string;
        builder_boost_factor?: string;
        strict_fee_recipient_check?: boolean;
        blinded_local?: boolean;
      };
    },
    BlockContents | BlindedBeaconBlock,
    ProduceBlockV3Meta
  >;

  /**
   * Requests a beacon node to produce a valid block, which can then be signed by a validator.
   *
   * Post-Gloas, proposers submit execution payload bids rather than full execution payloads,
   * so there is no longer a concept of blinded or unblinded blocks. Builders release the payload later.
   * This endpoint is specific to the post-Gloas forks and is not backwards compatible with previous forks.
   */
  produceBlockV4: Endpoint<
    "GET",
    {
      /** The slot for which the block should be proposed */
      slot: Slot;
      /** The validator's randao reveal value */
      randaoReveal: BLSSignature;
      /** Arbitrary data validator wants to include in block */
      graffiti?: string;
      skipRandaoVerification?: boolean;
      builderBoostFactor?: UintBn64;
    } & Omit<ExtraProduceBlockOpts, "blindedLocal">,
    {
      params: {slot: number};
      query: {
        randao_reveal: string;
        graffiti?: string;
        skip_randao_verification?: string;
        fee_recipient?: string;
        builder_selection?: string;
        builder_boost_factor?: string;
        strict_fee_recipient_check?: boolean;
      };
    },
    BeaconBlock<ForkPostGloas>,
    ProduceBlockV4Meta
  >;

  /**
   * Get execution payload envelope.
   * Retrieves execution payload envelope for a given slot and beacon block root.
   * The envelope contains the full execution payload along with associated metadata.
   */
  getExecutionPayloadEnvelope: Endpoint<
    "GET",
    {
      /** Slot for which the execution payload envelope is requested */
      slot: Slot;
      /** Root of the beacon block that this envelope is for */
      beaconBlockRoot: Root;
    },
    {params: {slot: Slot; beacon_block_root: string}},
    gloas.ExecutionPayloadEnvelope,
    VersionMeta
  >;

  /**
   * Produce an attestation data
   * Requests that the beacon node produce an AttestationData.
   */
  produceAttestationData: Endpoint<
    "GET",
    {
      /** The committee index for which an attestation data should be created */
      committeeIndex?: CommitteeIndex;
      /** The slot for which an attestation data should be created */
      slot: Slot;
    },
    {query: {slot: number; committee_index?: number}},
    phase0.AttestationData,
    EmptyMeta
  >;

  produceSyncCommitteeContribution: Endpoint<
    "GET",
    {
      slot: Slot;
      subcommitteeIndex: number;
      beaconBlockRoot: Root;
    },
    {query: {slot: number; subcommittee_index: number; beacon_block_root: string}},
    altair.SyncCommitteeContribution,
    EmptyMeta
  >;

  /**
   * Get aggregated attestation
   * Aggregates all attestations matching given attestation data root and slot
   * Returns an aggregated `Attestation` object with same `AttestationData` root.
   */
  getAggregatedAttestation: Endpoint<
    "GET",
    {
      /** HashTreeRoot of AttestationData that validator want's aggregated */
      attestationDataRoot: Root;
      slot: Slot;
    },
    {query: {attestation_data_root: string; slot: number}},
    phase0.Attestation,
    EmptyMeta
  >;

  /**
   * Get aggregated attestation
   * Aggregates all attestations matching given attestation data root, slot and committee index
   * Returns an aggregated `Attestation` object with same `AttestationData` root.
   */
  getAggregatedAttestationV2: Endpoint<
    "GET",
    {
      /** HashTreeRoot of AttestationData that validator want's aggregated */
      attestationDataRoot: Root;
      slot: Slot;
      committeeIndex: number;
    },
    {query: {attestation_data_root: string; slot: number; committee_index: number}},
    Attestation,
    VersionMeta
  >;

  /**
   * Publish multiple aggregate and proofs
   * Verifies given aggregate and proofs and publishes them on appropriate gossipsub topic.
   */
  publishAggregateAndProofs: Endpoint<
    "POST",
    {signedAggregateAndProofs: SignedAggregateAndProofListPhase0},
    {body: unknown},
    EmptyResponseData,
    EmptyMeta
  >;

  /**
   * Publish multiple aggregate and proofs
   * Verifies given aggregate and proofs and publishes them on appropriate gossipsub topic.
   */
  publishAggregateAndProofsV2: Endpoint<
    "POST",
    {signedAggregateAndProofs: SignedAggregateAndProofList},
    {body: unknown; headers: {[MetaHeader.Version]: string}},
    EmptyResponseData,
    EmptyMeta
  >;

  publishContributionAndProofs: Endpoint<
    "POST",
    {contributionAndProofs: SignedContributionAndProofList},
    {body: unknown},
    EmptyResponseData,
    EmptyMeta
  >;

  /**
   * Signal beacon node to prepare for a committee subnet
   * After beacon node receives this request,
   * search using discv5 for peers related to this subnet
   * and replace current peers with those ones if necessary
   * If validator `is_aggregator`, beacon node must:
   * - announce subnet topic subscription on gossipsub
   * - aggregate attestations received on that subnet
   *
   * Returns if slot signature is valid and beacon node has prepared the attestation subnet.
   *
   * Note that we cannot be certain the Beacon node will find peers for that subnet for various reasons.
   */
  prepareBeaconCommitteeSubnet: Endpoint<
    "POST",
    {subscriptions: BeaconCommitteeSubscriptionList},
    {body: unknown},
    EmptyResponseData,
    EmptyMeta
  >;

  prepareSyncCommitteeSubnets: Endpoint<
    "POST",
    {subscriptions: SyncCommitteeSubscriptionList},
    {body: unknown},
    EmptyResponseData,
    EmptyMeta
  >;

  prepareBeaconProposer: Endpoint<
    "POST",
    {proposers: ProposerPreparationDataList},
    {body: unknown},
    EmptyResponseData,
    EmptyMeta
  >;

  /**
   * Determine if a distributed validator has been selected to aggregate attestations
   *
   * This endpoint is implemented by a distributed validator middleware client to exchange
   * partial beacon committee selection proofs for combined/aggregated selection proofs to allow
   * a validator client to correctly determine if one of its validators has been selected to
   * perform an aggregation duty in this slot.
   *
   * Validator clients running in a distributed validator cluster must query this endpoint
   * at the start of an epoch for the current and lookahead (next) epochs for all validators
   * that have attester duties in the current and lookahead epochs.
   *
   * Note that this endpoint is not implemented by the beacon node and will return a 501 error
   *
   * Returns an array of threshold aggregated beacon committee selection proofs
   */
  submitBeaconCommitteeSelections: Endpoint<
    "POST",
    {
      /** An array of partial beacon committee selection proofs */
      selections: BeaconCommitteeSelectionList;
    },
    {body: unknown},
    BeaconCommitteeSelectionList,
    EmptyMeta
  >;

  /**
   * Determine if a distributed validator has been selected to make a sync committee contribution
   *
   * This endpoint is implemented by a distributed validator middleware client to exchange
   * partial sync committee selection proofs for combined/aggregated selection proofs to allow
   * a validator client to correctly determine if one of its validators has been selected to
   * perform a sync committee contribution (sync aggregation) duty in this slot.
   *
   * Validator clients running in a distributed validator cluster must query this endpoint
   * at the start of each slot for all validators that are included in the current sync committee.
   *
   * Note that this endpoint is not implemented by the beacon node and will return a 501 error
   *
   * Returns an array of threshold aggregated sync committee selection proofs
   */
  submitSyncCommitteeSelections: Endpoint<
    "POST",
    {
      /** An array of partial sync committee selection proofs */
      selections: SyncCommitteeSelectionList;
    },
    {body: unknown},
    SyncCommitteeSelectionList,
    EmptyMeta
  >;

  /** Returns validator indices that have been observed to be active on the network */
  getLiveness: Endpoint<
    "POST",
    {
      epoch: Epoch;
      indices: ValidatorIndex[];
    },
    {params: {epoch: Epoch}; body: unknown},
    LivenessResponseDataList,
    EmptyMeta
  >;

  registerValidator: Endpoint<
    "POST",
    {registrations: SignedValidatorRegistrationV1List},
    {body: unknown},
    EmptyResponseData,
    EmptyMeta
  >;
};

export function getDefinitions(config: ChainForkConfig): RouteDefinitions<Endpoints> {
  return {
    getAttesterDuties: {
      url: "/eth/v1/validator/duties/attester/{epoch}",
      method: "POST",
      req: {
        writeReqJson: ({epoch, indices}) => ({params: {epoch}, body: ValidatorIndicesType.toJson(indices)}),
        parseReqJson: ({params, body}) => ({epoch: params.epoch, indices: ValidatorIndicesType.fromJson(body)}),
        writeReqSsz: ({epoch, indices}) => ({params: {epoch}, body: ValidatorIndicesType.serialize(indices)}),
        parseReqSsz: ({params, body}) => ({epoch: params.epoch, indices: ValidatorIndicesType.deserialize(body)}),
        schema: {
          params: {epoch: Schema.UintRequired},
          body: Schema.StringArray,
        },
      },
      resp: {
        data: AttesterDutyListType,
        meta: ExecutionOptimisticAndDependentRootCodec,
      },
    },
    getProposerDuties: {
      url: "/eth/v1/validator/duties/proposer/{epoch}",
      method: "GET",
      req: {
        writeReq: ({epoch}) => ({params: {epoch}}),
        parseReq: ({params}) => ({epoch: params.epoch}),
        schema: {
          params: {epoch: Schema.UintRequired},
        },
      },
      resp: {
        data: ProposerDutyListType,
        meta: ExecutionOptimisticAndDependentRootCodec,
      },
    },
    getProposerDutiesV2: {
      url: "/eth/v2/validator/duties/proposer/{epoch}",
      method: "GET",
      req: {
        writeReq: ({epoch}) => ({params: {epoch}}),
        parseReq: ({params}) => ({epoch: params.epoch}),
        schema: {
          params: {epoch: Schema.UintRequired},
        },
      },
      resp: {
        data: ProposerDutyListType,
        meta: ExecutionOptimisticAndDependentRootCodec,
      },
    },
    getSyncCommitteeDuties: {
      url: "/eth/v1/validator/duties/sync/{epoch}",
      method: "POST",
      req: {
        writeReqJson: ({epoch, indices}) => ({params: {epoch}, body: ValidatorIndicesType.toJson(indices)}),
        parseReqJson: ({params, body}) => ({epoch: params.epoch, indices: ValidatorIndicesType.fromJson(body)}),
        writeReqSsz: ({epoch, indices}) => ({params: {epoch}, body: ValidatorIndicesType.serialize(indices)}),
        parseReqSsz: ({params, body}) => ({epoch: params.epoch, indices: ValidatorIndicesType.deserialize(body)}),
        schema: {
          params: {epoch: Schema.UintRequired},
          body: Schema.StringArray,
        },
      },
      resp: {
        data: SyncDutyListType,
        meta: ExecutionOptimisticCodec,
      },
    },
    produceBlockV3: {
      url: "/eth/v3/validator/blocks/{slot}",
      method: "GET",
      req: {
        writeReq: ({
          slot,
          randaoReveal,
          graffiti,
          skipRandaoVerification,
          feeRecipient,
          builderSelection,
          builderBoostFactor,
          strictFeeRecipientCheck,
          blindedLocal,
        }) => ({
          params: {slot},
          query: {
            randao_reveal: toHex(randaoReveal),
            graffiti: toGraffitiHex(graffiti),
            skip_randao_verification: writeSkipRandaoVerification(skipRandaoVerification),
            fee_recipient: feeRecipient,
            builder_selection: builderSelection,
            builder_boost_factor: builderBoostFactor?.toString(),
            strict_fee_recipient_check: strictFeeRecipientCheck,
            blinded_local: blindedLocal,
          },
        }),
        parseReq: ({params, query}) => ({
          slot: params.slot,
          randaoReveal: fromHex(query.randao_reveal),
          graffiti: fromGraffitiHex(query.graffiti),
          skipRandaoVerification: parseSkipRandaoVerification(query.skip_randao_verification),
          feeRecipient: query.fee_recipient,
          builderSelection: query.builder_selection as BuilderSelection,
          builderBoostFactor: parseBuilderBoostFactor(query.builder_boost_factor),
          strictFeeRecipientCheck: query.strict_fee_recipient_check,
          blindedLocal: query.blinded_local,
        }),
        schema: {
          params: {slot: Schema.UintRequired},
          query: {
            randao_reveal: Schema.StringRequired,
            graffiti: Schema.String,
            skip_randao_verification: Schema.String,
            fee_recipient: Schema.String,
            builder_selection: Schema.String,
            builder_boost_factor: Schema.String,
            strict_fee_recipient_check: Schema.Boolean,
            blinded_local: Schema.Boolean,
          },
        },
      },
      resp: {
        // The spec defines the response as `preDeneb.BeaconBlock | postDeneb.BlockContents`
        // We represent the response as `{block: preDeneb.BeaconBlock} | postDeneb.BlockContents` (aka BlockContents in our codebase)
        // Due to this discripancy, we require a hand-written codec to handle the transformation.
        data: {
          toJson(data, {executionPayloadBlinded, version}) {
            return executionPayloadBlinded
              ? getPostBellatrixForkTypes(version).BlindedBeaconBlock.toJson(data as BlindedBeaconBlock)
              : isForkPostDeneb(version)
                ? sszTypesFor(version).BlockContents.toJson(data as BlockContents<ForkPostDeneb>)
                : (ssz[version].BeaconBlock as Type<BeaconBlock<ForkPreDeneb>>).toJson(
                    (data as BlockContents).block as BeaconBlock<ForkPreDeneb> // <- tranformation
                  );
          },
          fromJson(data, {executionPayloadBlinded, version}) {
            return executionPayloadBlinded
              ? getPostBellatrixForkTypes(version).BlindedBeaconBlock.fromJson(data)
              : isForkPostDeneb(version)
                ? sszTypesFor(version).BlockContents.fromJson(data)
                : {block: ssz[version].BeaconBlock.fromJson(data)}; // <- tranformation
          },
          serialize(data, {executionPayloadBlinded, version}) {
            return executionPayloadBlinded
              ? getPostBellatrixForkTypes(version).BlindedBeaconBlock.serialize(data as BlindedBeaconBlock)
              : isForkPostDeneb(version)
                ? sszTypesFor(version).BlockContents.serialize(data as BlockContents<ForkPostDeneb>)
                : (ssz[version].BeaconBlock as Type<BeaconBlock<ForkPreDeneb>>).serialize(
                    (data as BlockContents).block as BeaconBlock<ForkPreDeneb> // <- tranformation
                  );
          },
          deserialize(data, {executionPayloadBlinded, version}) {
            return executionPayloadBlinded
              ? getPostBellatrixForkTypes(version).BlindedBeaconBlock.deserialize(data)
              : isForkPostDeneb(version)
                ? sszTypesFor(version).BlockContents.deserialize(data)
                : {block: ssz[version].BeaconBlock.deserialize(data)}; // <- tranformation
          },
        },
        meta: {
          toJson: (meta) => ({
            ...ProduceBlockV3MetaType.toJson(meta),
            execution_payload_source: meta.executionPayloadSource,
          }),
          fromJson: (val) => {
            const {executionPayloadBlinded, ...meta} = ProduceBlockV3MetaType.fromJson(val);

            // Extract source from the data and assign defaults in the spec compliant manner if not present
            const executionPayloadSource =
              (val as {execution_payload_source: ProducedBlockSource}).execution_payload_source ??
              (executionPayloadBlinded === true ? ProducedBlockSource.builder : ProducedBlockSource.engine);

            return {...meta, executionPayloadBlinded, executionPayloadSource};
          },
          toHeadersObject: (meta) => ({
            [MetaHeader.Version]: meta.version,
            [MetaHeader.ExecutionPayloadBlinded]: meta.executionPayloadBlinded.toString(),
            [MetaHeader.ExecutionPayloadSource]: meta.executionPayloadSource.toString(),
            [MetaHeader.ExecutionPayloadValue]: meta.executionPayloadValue.toString(),
            [MetaHeader.ConsensusBlockValue]: meta.consensusBlockValue.toString(),
          }),
          fromHeaders: (headers) => {
            const executionPayloadBlinded = toBoolean(headers.getRequired(MetaHeader.ExecutionPayloadBlinded));

            // Extract source from the headers and assign defaults in a spec compliant manner if not present
            const executionPayloadSource =
              (headers.get(MetaHeader.ExecutionPayloadSource) as ProducedBlockSource) ??
              (executionPayloadBlinded === true ? ProducedBlockSource.builder : ProducedBlockSource.engine);

            return {
              version: toForkName(headers.getRequired(MetaHeader.Version)),
              executionPayloadBlinded,
              executionPayloadSource,
              executionPayloadValue: BigInt(headers.getRequired(MetaHeader.ExecutionPayloadValue)),
              consensusBlockValue: BigInt(headers.getRequired(MetaHeader.ConsensusBlockValue)),
            };
          },
        },
      },
    },
    produceBlockV4: {
      url: "/eth/v4/validator/blocks/{slot}",
      method: "GET",
      req: {
        writeReq: ({
          slot,
          randaoReveal,
          graffiti,
          skipRandaoVerification,
          feeRecipient,
          builderSelection,
          builderBoostFactor,
          strictFeeRecipientCheck,
        }) => ({
          params: {slot},
          query: {
            randao_reveal: toHex(randaoReveal),
            graffiti: toGraffitiHex(graffiti),
            skip_randao_verification: writeSkipRandaoVerification(skipRandaoVerification),
            fee_recipient: feeRecipient,
            builder_selection: builderSelection,
            builder_boost_factor: builderBoostFactor?.toString(),
            strict_fee_recipient_check: strictFeeRecipientCheck,
          },
        }),
        parseReq: ({params, query}) => ({
          slot: params.slot,
          randaoReveal: fromHex(query.randao_reveal),
          graffiti: fromGraffitiHex(query.graffiti),
          skipRandaoVerification: parseSkipRandaoVerification(query.skip_randao_verification),
          feeRecipient: query.fee_recipient,
          builderSelection: query.builder_selection as BuilderSelection,
          builderBoostFactor: parseBuilderBoostFactor(query.builder_boost_factor),
          strictFeeRecipientCheck: query.strict_fee_recipient_check,
        }),
        schema: {
          params: {slot: Schema.UintRequired},
          query: {
            randao_reveal: Schema.StringRequired,
            graffiti: Schema.String,
            skip_randao_verification: Schema.String,
            fee_recipient: Schema.String,
            builder_selection: Schema.String,
            builder_boost_factor: Schema.String,
            strict_fee_recipient_check: Schema.Boolean,
          },
        },
      },
      resp: {
        data: WithVersion((fork) => getPostGloasForkTypes(fork).BeaconBlock),
        meta: {
          toJson: (meta) => ProduceBlockV4MetaType.toJson(meta),
          fromJson: (val) => ProduceBlockV4MetaType.fromJson(val),
          toHeadersObject: (meta) => ({
            [MetaHeader.Version]: meta.version,
            [MetaHeader.ConsensusBlockValue]: meta.consensusBlockValue.toString(),
          }),
          fromHeaders: (headers) => ({
            version: toForkName(headers.getRequired(MetaHeader.Version)),
            consensusBlockValue: BigInt(headers.getRequired(MetaHeader.ConsensusBlockValue)),
          }),
        },
      },
    },
    getExecutionPayloadEnvelope: {
      url: "/eth/v1/validator/execution_payload_envelope/{slot}/{beacon_block_root}",
      method: "GET",
      req: {
        writeReq: ({slot, beaconBlockRoot}) => ({
          params: {
            slot,
            beacon_block_root: toRootHex(beaconBlockRoot),
          },
        }),
        parseReq: ({params}) => ({
          slot: params.slot,
          beaconBlockRoot: fromHex(params.beacon_block_root),
        }),
        schema: {
          params: {
            slot: Schema.UintRequired,
            beacon_block_root: Schema.StringRequired,
          },
        },
      },
      resp: {
        data: ssz.gloas.ExecutionPayloadEnvelope,
        meta: VersionCodec,
      },
    },
    produceAttestationData: {
      url: "/eth/v1/validator/attestation_data",
      method: "GET",
      req: {
        writeReq: ({committeeIndex, slot}) => ({query: {slot, committee_index: committeeIndex}}),
        parseReq: ({query}) => ({committeeIndex: query.committee_index, slot: query.slot}),
        schema: {
          query: {slot: Schema.UintRequired, committee_index: Schema.Uint},
        },
      },
      resp: {
        data: ssz.phase0.AttestationData,
        meta: EmptyMetaCodec,
      },
    },
    produceSyncCommitteeContribution: {
      url: "/eth/v1/validator/sync_committee_contribution",
      method: "GET",
      req: {
        writeReq: ({slot, subcommitteeIndex, beaconBlockRoot}) => ({
          query: {slot, subcommittee_index: subcommitteeIndex, beacon_block_root: toRootHex(beaconBlockRoot)},
        }),
        parseReq: ({query}) => ({
          slot: query.slot,
          subcommitteeIndex: query.subcommittee_index,
          beaconBlockRoot: fromHex(query.beacon_block_root),
        }),
        schema: {
          query: {
            slot: Schema.UintRequired,
            subcommittee_index: Schema.UintRequired,
            beacon_block_root: Schema.StringRequired,
          },
        },
      },
      resp: {
        data: ssz.altair.SyncCommitteeContribution,
        meta: EmptyMetaCodec,
      },
    },
    getAggregatedAttestation: {
      url: "/eth/v1/validator/aggregate_attestation",
      method: "GET",
      req: {
        writeReq: ({attestationDataRoot, slot}) => ({
          query: {attestation_data_root: toRootHex(attestationDataRoot), slot},
        }),
        parseReq: ({query}) => ({
          attestationDataRoot: fromHex(query.attestation_data_root),
          slot: query.slot,
        }),
        schema: {
          query: {
            attestation_data_root: Schema.StringRequired,
            slot: Schema.UintRequired,
          },
        },
      },
      resp: {
        data: ssz.phase0.Attestation,
        meta: EmptyMetaCodec,
      },
    },
    getAggregatedAttestationV2: {
      url: "/eth/v2/validator/aggregate_attestation",
      method: "GET",
      req: {
        writeReq: ({attestationDataRoot, slot, committeeIndex}) => ({
          query: {attestation_data_root: toHex(attestationDataRoot), slot, committee_index: committeeIndex},
        }),
        parseReq: ({query}) => ({
          attestationDataRoot: fromHex(query.attestation_data_root),
          slot: query.slot,
          committeeIndex: query.committee_index,
        }),
        schema: {
          query: {
            attestation_data_root: Schema.StringRequired,
            slot: Schema.UintRequired,
            committee_index: Schema.UintRequired,
          },
        },
      },
      resp: {
        data: WithVersion((fork) => (isForkPostElectra(fork) ? ssz.electra.Attestation : ssz.phase0.Attestation)),
        meta: VersionCodec,
      },
    },
    publishAggregateAndProofs: {
      url: "/eth/v1/validator/aggregate_and_proofs",
      method: "POST",
      req: {
        writeReqJson: ({signedAggregateAndProofs}) => ({
          body: SignedAggregateAndProofListPhase0Type.toJson(signedAggregateAndProofs),
        }),
        parseReqJson: ({body}) => ({
          signedAggregateAndProofs: SignedAggregateAndProofListPhase0Type.fromJson(body),
        }),
        writeReqSsz: ({signedAggregateAndProofs}) => ({
          body: SignedAggregateAndProofListPhase0Type.serialize(signedAggregateAndProofs),
        }),
        parseReqSsz: ({body}) => ({
          signedAggregateAndProofs: SignedAggregateAndProofListPhase0Type.deserialize(body),
        }),
        schema: {
          body: Schema.ObjectArray,
        },
      },
      resp: EmptyResponseCodec,
    },
    publishAggregateAndProofsV2: {
      url: "/eth/v2/validator/aggregate_and_proofs",
      method: "POST",
      req: {
        writeReqJson: ({signedAggregateAndProofs}) => {
          const fork = config.getForkName(signedAggregateAndProofs[0]?.message.aggregate.data.slot ?? 0);
          return {
            body: isForkPostElectra(fork)
              ? SignedAggregateAndProofListElectraType.toJson(
                  signedAggregateAndProofs as SignedAggregateAndProofListElectra
                )
              : SignedAggregateAndProofListPhase0Type.toJson(
                  signedAggregateAndProofs as SignedAggregateAndProofListPhase0
                ),
            headers: {[MetaHeader.Version]: fork},
          };
        },
        parseReqJson: ({body, headers}) => {
          const fork = toForkName(fromHeaders(headers, MetaHeader.Version));
          return {
            signedAggregateAndProofs: isForkPostElectra(fork)
              ? SignedAggregateAndProofListElectraType.fromJson(body)
              : SignedAggregateAndProofListPhase0Type.fromJson(body),
          };
        },
        writeReqSsz: ({signedAggregateAndProofs}) => {
          const fork = config.getForkName(signedAggregateAndProofs[0]?.message.aggregate.data.slot ?? 0);
          return {
            body: isForkPostElectra(fork)
              ? SignedAggregateAndProofListElectraType.serialize(
                  signedAggregateAndProofs as SignedAggregateAndProofListElectra
                )
              : SignedAggregateAndProofListPhase0Type.serialize(
                  signedAggregateAndProofs as SignedAggregateAndProofListPhase0
                ),
            headers: {[MetaHeader.Version]: fork},
          };
        },
        parseReqSsz: ({body, headers}) => {
          const fork = toForkName(fromHeaders(headers, MetaHeader.Version));
          return {
            signedAggregateAndProofs: isForkPostElectra(fork)
              ? SignedAggregateAndProofListElectraType.deserialize(body)
              : SignedAggregateAndProofListPhase0Type.deserialize(body),
          };
        },
        schema: {
          body: Schema.ObjectArray,
          headers: {[MetaHeader.Version]: Schema.String},
        },
      },
      resp: EmptyResponseCodec,
    },
    publishContributionAndProofs: {
      url: "/eth/v1/validator/contribution_and_proofs",
      method: "POST",
      req: {
        writeReqJson: ({contributionAndProofs}) => ({
          body: SignedContributionAndProofListType.toJson(contributionAndProofs),
        }),
        parseReqJson: ({body}) => ({contributionAndProofs: SignedContributionAndProofListType.fromJson(body)}),
        writeReqSsz: ({contributionAndProofs}) => ({
          body: SignedContributionAndProofListType.serialize(contributionAndProofs),
        }),
        parseReqSsz: ({body}) => ({contributionAndProofs: SignedContributionAndProofListType.deserialize(body)}),
        schema: {
          body: Schema.ObjectArray,
        },
      },
      resp: EmptyResponseCodec,
    },
    prepareBeaconCommitteeSubnet: {
      url: "/eth/v1/validator/beacon_committee_subscriptions",
      method: "POST",
      req: {
        writeReqJson: ({subscriptions}) => ({body: BeaconCommitteeSubscriptionListType.toJson(subscriptions)}),
        parseReqJson: ({body}) => ({subscriptions: BeaconCommitteeSubscriptionListType.fromJson(body)}),
        writeReqSsz: ({subscriptions}) => ({body: BeaconCommitteeSubscriptionListType.serialize(subscriptions)}),
        parseReqSsz: ({body}) => ({subscriptions: BeaconCommitteeSubscriptionListType.deserialize(body)}),
        schema: {body: Schema.ObjectArray},
      },
      resp: EmptyResponseCodec,
    },
    prepareSyncCommitteeSubnets: {
      url: "/eth/v1/validator/sync_committee_subscriptions",
      method: "POST",
      req: {
        writeReqJson: ({subscriptions}) => ({body: SyncCommitteeSubscriptionListType.toJson(subscriptions)}),
        parseReqJson: ({body}) => ({subscriptions: SyncCommitteeSubscriptionListType.fromJson(body)}),
        writeReqSsz: ({subscriptions}) => ({body: SyncCommitteeSubscriptionListType.serialize(subscriptions)}),
        parseReqSsz: ({body}) => ({subscriptions: SyncCommitteeSubscriptionListType.deserialize(body)}),
        schema: {body: Schema.ObjectArray},
      },
      resp: EmptyResponseCodec,
    },
    prepareBeaconProposer: {
      url: "/eth/v1/validator/prepare_beacon_proposer",
      method: "POST",
      req: JsonOnlyReq({
        writeReqJson: ({proposers}) => ({body: ProposerPreparationDataListType.toJson(proposers)}),
        parseReqJson: ({body}) => ({proposers: ProposerPreparationDataListType.fromJson(body)}),
        schema: {body: Schema.ObjectArray},
      }),
      resp: EmptyResponseCodec,
    },
    submitBeaconCommitteeSelections: {
      url: "/eth/v1/validator/beacon_committee_selections",
      method: "POST",
      req: {
        writeReqJson: ({selections}) => ({body: BeaconCommitteeSelectionListType.toJson(selections)}),
        parseReqJson: ({body}) => ({selections: BeaconCommitteeSelectionListType.fromJson(body)}),
        writeReqSsz: ({selections}) => ({body: BeaconCommitteeSelectionListType.serialize(selections)}),
        parseReqSsz: ({body}) => ({selections: BeaconCommitteeSelectionListType.deserialize(body)}),
        schema: {
          body: Schema.ObjectArray,
        },
      },
      resp: {
        data: BeaconCommitteeSelectionListType,
        meta: EmptyMetaCodec,
      },
    },
    submitSyncCommitteeSelections: {
      url: "/eth/v1/validator/sync_committee_selections",
      method: "POST",
      req: {
        writeReqJson: ({selections}) => ({body: SyncCommitteeSelectionListType.toJson(selections)}),
        parseReqJson: ({body}) => ({selections: SyncCommitteeSelectionListType.fromJson(body)}),
        writeReqSsz: ({selections}) => ({body: SyncCommitteeSelectionListType.serialize(selections)}),
        parseReqSsz: ({body}) => ({selections: SyncCommitteeSelectionListType.deserialize(body)}),
        schema: {
          body: Schema.ObjectArray,
        },
      },
      resp: {
        data: SyncCommitteeSelectionListType,
        meta: EmptyMetaCodec,
      },
    },
    getLiveness: {
      url: "/eth/v1/validator/liveness/{epoch}",
      method: "POST",
      req: {
        writeReqJson: ({epoch, indices}) => ({params: {epoch}, body: ValidatorIndicesType.toJson(indices)}),
        parseReqJson: ({params, body}) => ({epoch: params.epoch, indices: ValidatorIndicesType.fromJson(body)}),
        writeReqSsz: ({epoch, indices}) => ({params: {epoch}, body: ValidatorIndicesType.serialize(indices)}),
        parseReqSsz: ({params, body}) => ({epoch: params.epoch, indices: ValidatorIndicesType.deserialize(body)}),
        schema: {
          params: {epoch: Schema.UintRequired},
          body: Schema.StringArray,
        },
      },
      resp: {
        data: LivenessResponseDataListType,
        meta: EmptyMetaCodec,
      },
    },
    registerValidator: {
      url: "/eth/v1/validator/register_validator",
      method: "POST",
      req: {
        writeReqJson: ({registrations}) => ({body: SignedValidatorRegistrationV1ListType.toJson(registrations)}),
        parseReqJson: ({body}) => ({registrations: SignedValidatorRegistrationV1ListType.fromJson(body)}),
        writeReqSsz: ({registrations}) => ({body: SignedValidatorRegistrationV1ListType.serialize(registrations)}),
        parseReqSsz: ({body}) => ({registrations: SignedValidatorRegistrationV1ListType.deserialize(body)}),
        schema: {
          body: Schema.ObjectArray,
        },
      },
      resp: EmptyResponseCodec,
      init: {
        requestWireFormat: WireFormat.ssz,
      },
    },
  };
}

function parseBuilderBoostFactor(builderBoostFactorInput?: string | number | bigint): bigint | undefined {
  return builderBoostFactorInput !== undefined ? BigInt(builderBoostFactorInput) : undefined;
}

function writeSkipRandaoVerification(skipRandaoVerification?: boolean): string | undefined {
  return skipRandaoVerification === true ? "" : undefined;
}

function parseSkipRandaoVerification(skipRandaoVerification?: string): boolean {
  return skipRandaoVerification !== undefined && skipRandaoVerification === "";
}