/**
 * @file Steem protocol serialization.
 * @author Johan Nordberg <code@johan-nordberg.com>
 * @license
 * Copyright (c) 2017 Johan Nordberg. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *  1. Redistribution of source code must retain the above copyright notice, this
 *     list of conditions and the following disclaimer.
 *
 *  2. Redistribution in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *  3. Neither the name of the copyright holder nor the names of its contributors
 *     may be used to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * You acknowledge that this software is not designed, licensed or intended for use
 * in the design, construction, operation or maintenance of any military facility.
 */

import * as ByteBuffer from 'bytebuffer'
import {PublicKey} from './../crypto'
import {Asset, Price} from './asset'
import {HexBuffer} from './misc'
import {Operation} from './operation'

export interface SerializerOptions {
    addressPrefix: string
}

export type Serializer = (buffer: ByteBuffer, data: any, options: SerializerOptions) => void

const VoidSerializer = (buffer: ByteBuffer) => {
    throw new Error('Void can not be serialized')
}

const StringSerializer = (buffer: ByteBuffer, data: string) => {
    buffer.writeVString(data)
}

const Int16Serializer = (buffer: ByteBuffer, data: number) => {
    buffer.writeInt16(data)
}

const UInt16Serializer = (buffer: ByteBuffer, data: number) => {
    buffer.writeUint16(data)
}

const UInt32Serializer = (buffer: ByteBuffer, data: number) => {
    buffer.writeUint32(data)
}

const BooleanSerializer = (buffer: ByteBuffer, data: boolean) => {
    buffer.writeByte(data ? 1 : 0)
}

const StaticVariantSerializer = (itemSerializers: Serializer[]) => {
    return (buffer: ByteBuffer, data: [number, any], options: SerializerOptions) => {
        const [id, item] = data
        buffer.writeVarint32(id)
        itemSerializers[id](buffer, item, options)
    }
}

/**
 * Serialize asset.
 * @note This looses precision for amounts larger than 2^53-1/10^precision.
 *       Should not be a problem in real-word usage.
 */
const AssetSerializer = (buffer: ByteBuffer, data: Asset | string | number) => {
    const asset = Asset.from(data)
    const precision = asset.getPrecision()
    buffer.writeInt64(Math.round(asset.amount * Math.pow(10, precision)))
    buffer.writeUint8(precision)
    for (let i = 0; i < 7; i++) {
        buffer.writeUint8(asset.symbol.charCodeAt(i) || 0)
    }
}

const DateSerializer = (buffer: ByteBuffer, data: string) => {
    buffer.writeUint32(Math.floor(new Date(data + 'Z').getTime() / 1000))
}

const PublicKeySerializer = (buffer: ByteBuffer, data: PublicKey | string | Buffer, options: SerializerOptions) => {
    buffer.append(PublicKey.from(data, options.addressPrefix).key)
}

const BufferSerializer = (size?: number) => {
    return (buffer: ByteBuffer, data: Buffer | HexBuffer) => {
        data = HexBuffer.from(data)
        const len = data.buffer.length
        if (size) {
            if (len !== size) {
                throw new Error(`Unable to serialize buffer. Expected ${ size } bytes, got ${ len }`)
            }
        } else {
            buffer.writeVarint32(len)
        }
        buffer.append(data.buffer)
    }
}

const FlatMapSerializer = (keySerializer: Serializer, valueSerializer: Serializer) => {
    return (buffer: ByteBuffer, data: Array<[any, any]>, options: SerializerOptions) => {
        buffer.writeVarint32(data.length)
        for (const [key, value] of data) {
            keySerializer(buffer, key, options)
            valueSerializer(buffer, value, options)
        }
    }
}

const ArraySerializer = (itemSerializer: Serializer) => {
    return (buffer: ByteBuffer, data: any[], options: SerializerOptions) => {
        buffer.writeVarint32(data.length)
        for (const item of data) {
            itemSerializer(buffer, item, options)
        }
    }
}

const ObjectSerializer = (keySerializers: Array<[string, Serializer]>) => {
    return (buffer: ByteBuffer, data: {[key: string]: any}, options: SerializerOptions) => {
        for (const [key, serializer] of keySerializers) {
            try {
                serializer(buffer, data[key], options)
            } catch (error) {
                error.message = `${ key }: ${ error.message }`
                throw error
            }
        }
    }
}

const OptionalSerializer = (valueSerializer: Serializer) => {
    return (buffer: ByteBuffer, data: any, options: SerializerOptions) => {
        if (data != undefined) {
            buffer.writeByte(1)
            valueSerializer(buffer, data, options)
        } else {
            buffer.writeByte(0)
        }
    }
}

const AuthoritySerializer = ObjectSerializer([
    ['weight_threshold', UInt32Serializer],
    ['account_auths', FlatMapSerializer(StringSerializer, UInt16Serializer)],
    ['key_auths', FlatMapSerializer(PublicKeySerializer, UInt16Serializer)],
])

const BeneficiarySerializer = ObjectSerializer([
    ['account', StringSerializer],
    ['weight', UInt16Serializer],
])

const PriceSerializer = ObjectSerializer([
    ['base', AssetSerializer],
    ['quote', AssetSerializer],
])

const SignedBlockHeaderSerializer = ObjectSerializer([
    ['previous', BufferSerializer(20)],
    ['timestamp', DateSerializer],
    ['witness', StringSerializer],
    ['transaction_merkle_root', BufferSerializer(20)],
    ['extensions', ArraySerializer(VoidSerializer)],
    ['witness_signature', BufferSerializer(65)],
])

const ChainPropertiesSerializer = ObjectSerializer([
    ['account_creation_fee', AssetSerializer],
    ['maximum_block_size', UInt32Serializer],
    ['sbd_interest_rate', UInt16Serializer],
])

const OperationDataSerializer = (operationId: number, definitions: Array<[string, Serializer]>) => {
   const objectSerializer = ObjectSerializer(definitions)
   return (buffer: ByteBuffer, data: {[key: string]: any}, options: SerializerOptions) => {
        buffer.writeVarint32(operationId)
        objectSerializer(buffer, data, options)
    }
}

const OperationSerializers: {[name: string]: Serializer} = {}

OperationSerializers.account_create = OperationDataSerializer(9, [
    ['fee', AssetSerializer],
    ['creator', StringSerializer],
    ['new_account_name', StringSerializer],
    ['owner', AuthoritySerializer],
    ['active', AuthoritySerializer],
    ['posting', AuthoritySerializer],
    ['memo_key', PublicKeySerializer],
    ['json_metadata', StringSerializer],
])

OperationSerializers.account_create_with_delegation = OperationDataSerializer(41, [
    ['fee', AssetSerializer],
    ['delegation', AssetSerializer],
    ['creator', StringSerializer],
    ['new_account_name', StringSerializer],
    ['owner', AuthoritySerializer],
    ['active', AuthoritySerializer],
    ['posting', AuthoritySerializer],
    ['memo_key', PublicKeySerializer],
    ['json_metadata', StringSerializer],
    ['extensions', ArraySerializer(VoidSerializer)],
])

OperationSerializers.account_update = OperationDataSerializer(10, [
    ['account', StringSerializer],
    ['owner', OptionalSerializer(AuthoritySerializer)],
    ['active', OptionalSerializer(AuthoritySerializer)],
    ['posting', OptionalSerializer(AuthoritySerializer)],
    ['memo_key', PublicKeySerializer],
    ['json_metadata', StringSerializer],
])

OperationSerializers.account_witness_proxy = OperationDataSerializer(13, [
    ['account', StringSerializer],
    ['proxy', StringSerializer],
])

OperationSerializers.account_witness_vote = OperationDataSerializer(12, [
    ['account', StringSerializer],
    ['witness', StringSerializer],
    ['approve', BooleanSerializer],
])

OperationSerializers.cancel_transfer_from_savings = OperationDataSerializer(34, [
    ['from', StringSerializer],
    ['request_id', UInt32Serializer],
])

OperationSerializers.challenge_authority = OperationDataSerializer(22, [
    ['challenger', StringSerializer],
    ['challenged', StringSerializer],
    ['require_owner', BooleanSerializer],
])

OperationSerializers.change_recovery_account = OperationDataSerializer(26, [
    ['account_to_recover', StringSerializer],
    ['new_recovery_account', StringSerializer],
    ['extensions', ArraySerializer(VoidSerializer)],
])

OperationSerializers.claim_reward_balance = OperationDataSerializer(39, [
    ['account', StringSerializer],
    ['reward_steem', AssetSerializer],
    ['reward_sbd', AssetSerializer],
    ['reward_vests', AssetSerializer],
])

OperationSerializers.comment = OperationDataSerializer(1, [
    ['parent_author', StringSerializer],
    ['parent_permlink', StringSerializer],
    ['author', StringSerializer],
    ['permlink', StringSerializer],
    ['title', StringSerializer],
    ['body', StringSerializer],
    ['json_metadata', StringSerializer],
])

OperationSerializers.comment_options = OperationDataSerializer(19, [
    ['author', StringSerializer],
    ['permlink', StringSerializer],
    ['max_accepted_payout', AssetSerializer],
    ['percent_steem_dollars', UInt16Serializer],
    ['allow_votes', BooleanSerializer],
    ['allow_curation_rewards', BooleanSerializer],
    ['extensions', ArraySerializer(
        StaticVariantSerializer([ObjectSerializer(
            [['beneficiaries', ArraySerializer(BeneficiarySerializer)]],
        )]),
    )],
])

OperationSerializers.convert = OperationDataSerializer(8, [
    ['owner', StringSerializer],
    ['requestid', UInt32Serializer],
    ['amount', AssetSerializer],
])

OperationSerializers.custom = OperationDataSerializer(15, [
    ['required_auths', ArraySerializer(StringSerializer)],
    ['id', UInt16Serializer],
    ['data', BufferSerializer()],
])

OperationSerializers.custom_binary = OperationDataSerializer(35, [
    ['required_owner_auths', ArraySerializer(StringSerializer)],
    ['required_active_auths', ArraySerializer(StringSerializer)],
    ['required_posting_auths', ArraySerializer(StringSerializer)],
    ['required_auths', ArraySerializer(AuthoritySerializer)],
    ['id', StringSerializer],
    ['data', BufferSerializer()],
])

OperationSerializers.custom_json = OperationDataSerializer(18, [
    ['required_auths', ArraySerializer(StringSerializer)],
    ['required_posting_auths', ArraySerializer(StringSerializer)],
    ['id', StringSerializer],
    ['json', StringSerializer],
])

OperationSerializers.decline_voting_rights = OperationDataSerializer(36, [
    ['account', StringSerializer],
    ['decline', BooleanSerializer],
])

OperationSerializers.delegate_vesting_shares = OperationDataSerializer(40, [
    ['delegator', StringSerializer],
    ['delegatee', StringSerializer],
    ['vesting_shares', AssetSerializer],
])

OperationSerializers.delete_comment = OperationDataSerializer(17, [
    ['author', StringSerializer],
    ['permlink', StringSerializer],
])

OperationSerializers.escrow_approve = OperationDataSerializer(31, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['agent', StringSerializer],
    ['who', StringSerializer],
    ['escrow_id', UInt32Serializer],
    ['approve', BooleanSerializer],
])

OperationSerializers.escrow_dispute = OperationDataSerializer(28, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['agent', StringSerializer],
    ['who', StringSerializer],
    ['escrow_id', UInt32Serializer],
])

OperationSerializers.escrow_release = OperationDataSerializer(29, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['agent', StringSerializer],
    ['who', StringSerializer],
    ['receiver', StringSerializer],
    ['escrow_id', UInt32Serializer],
    ['sbd_amount', AssetSerializer],
    ['steem_amount', AssetSerializer],
])

OperationSerializers.escrow_transfer = OperationDataSerializer(27, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['agent', StringSerializer],
    ['escrow_id', UInt32Serializer],
    ['sbd_amount', AssetSerializer],
    ['steem_amount', AssetSerializer],
    ['fee', AssetSerializer],
    ['ratification_deadline', DateSerializer],
    ['escrow_expiration', DateSerializer],
    ['json_meta', StringSerializer],
])

OperationSerializers.feed_publish = OperationDataSerializer(7, [
    ['publisher', StringSerializer],
    ['exchange_rate', PriceSerializer],
])

OperationSerializers.limit_order_cancel = OperationDataSerializer(6, [
    ['owner', StringSerializer],
    ['orderid', UInt32Serializer],
])

OperationSerializers.limit_order_create = OperationDataSerializer(5, [
    ['owner', StringSerializer],
    ['orderid', UInt32Serializer],
    ['amount_to_sell', AssetSerializer],
    ['min_to_receive', AssetSerializer],
    ['fill_or_kill', BooleanSerializer],
    ['expiration', DateSerializer],
])

OperationSerializers.limit_order_create2 = OperationDataSerializer(21, [
    ['owner', StringSerializer],
    ['orderid', UInt32Serializer],
    ['amount_to_sell', AssetSerializer],
    ['fill_or_kill', BooleanSerializer],
    ['exchange_rate', PriceSerializer],
    ['expiration', DateSerializer],
])

OperationSerializers.prove_authority = OperationDataSerializer(23, [
    ['challenged', StringSerializer],
    ['require_owner', BooleanSerializer],
])

OperationSerializers.recover_account = OperationDataSerializer(25, [
    ['account_to_recover', StringSerializer],
    ['new_owner_authority', AuthoritySerializer],
    ['recent_owner_authority', AuthoritySerializer],
    ['extensions', ArraySerializer(VoidSerializer)],
])

OperationSerializers.report_over_production = OperationDataSerializer(16, [
    ['reporter', StringSerializer],
    ['first_block', SignedBlockHeaderSerializer],
    ['second_block', SignedBlockHeaderSerializer],
])

OperationSerializers.request_account_recovery = OperationDataSerializer(24, [
    ['recovery_account', StringSerializer],
    ['account_to_recover', StringSerializer],
    ['new_owner_authority', AuthoritySerializer],
    ['extensions', ArraySerializer(VoidSerializer)],
])

OperationSerializers.reset_account = OperationDataSerializer(37, [
    ['reset_account', StringSerializer],
    ['account_to_reset', StringSerializer],
    ['new_owner_authority', AuthoritySerializer],
])

OperationSerializers.set_reset_account = OperationDataSerializer(38, [
    ['account', StringSerializer],
    ['current_reset_account', StringSerializer],
    ['reset_account', StringSerializer],
])

OperationSerializers.set_withdraw_vesting_route = OperationDataSerializer(20, [
    ['from_account', StringSerializer],
    ['to_account', StringSerializer],
    ['percent', UInt16Serializer],
    ['auto_vest', BooleanSerializer],
])

OperationSerializers.transfer = OperationDataSerializer(2, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['amount', AssetSerializer],
    ['memo', StringSerializer],
])

OperationSerializers.transfer_from_savings = OperationDataSerializer(33, [
    ['from', StringSerializer],
    ['request_id', UInt32Serializer],
    ['to', StringSerializer],
    ['amount', AssetSerializer],
    ['memo', StringSerializer],
])

OperationSerializers.transfer_to_savings = OperationDataSerializer(32, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['amount', AssetSerializer],
    ['memo', StringSerializer],
])

OperationSerializers.transfer_to_vesting = OperationDataSerializer(3, [
    ['from', StringSerializer],
    ['to', StringSerializer],
    ['amount', AssetSerializer],
])

OperationSerializers.vote = OperationDataSerializer(0, [
    ['voter', StringSerializer],
    ['author', StringSerializer],
    ['permlink', StringSerializer],
    ['weight', Int16Serializer],
])

OperationSerializers.withdraw_vesting = OperationDataSerializer(4, [
    ['account', StringSerializer],
    ['vesting_shares', AssetSerializer],
])

OperationSerializers.witness_update = OperationDataSerializer(11, [
    ['owner', StringSerializer],
    ['url', StringSerializer],
    ['block_signing_key', PublicKeySerializer],
    ['props', ChainPropertiesSerializer],
    ['fee', AssetSerializer],
])

const OperationSerializer = (buffer: ByteBuffer, operation: Operation, options: SerializerOptions) => {
    const serializer = OperationSerializers[operation[0]]
    if (!serializer) {
        throw new Error(`No serializer for operation: ${ operation[0] }`)
    }
    try {
        serializer(buffer, operation[1], options)
    } catch (error) {
        error.message = `${ operation[0] }: ${ error.message }`
        throw error
    }
}

const TransactionSerializer = ObjectSerializer([
    ['ref_block_num', UInt16Serializer],
    ['ref_block_prefix', UInt32Serializer],
    ['expiration', DateSerializer],
    ['operations', ArraySerializer(OperationSerializer)],
    ['extensions', ArraySerializer(StringSerializer)],
])

export const Types = {
    Array: ArraySerializer,
    Asset: AssetSerializer,
    Authority: AuthoritySerializer,
    Boolean: BooleanSerializer,
    Buffer: BufferSerializer,
    Date: DateSerializer,
    FlatMap: FlatMapSerializer,
    Int16: Int16Serializer,
    Object: ObjectSerializer,
    Operation: OperationSerializer,
    Optional: OptionalSerializer,
    Price: PriceSerializer,
    PublicKey: PublicKeySerializer,
    StaticVariant: StaticVariantSerializer,
    String: StringSerializer,
    Transaction: TransactionSerializer,
    UInt16: UInt16Serializer,
    UInt32: UInt32Serializer,
    Void: VoidSerializer,
}
