'use strict'
import { TX_TYPES, QORT_DECIMALS } from '../constants.js'
import nacl from '../deps/nacl-fast.js'
import Base58 from '../deps/Base58.js'
import utils from '../deps/utils.js'

export default class TransactionBase {
	static get utils() {
		return utils
	}
	static get nacl() {
		return nacl
	}
	static get Base58() {
		return Base58
	}

	constructor() {
		this.fee = 0
		this.groupID = 0
		this.timestamp = Date.now()
		this.tests = [
			() => {
				if (!(this._type >= 1 && this._type in TX_TYPES)) {
					return 'Invalid type: ' + this.type
				}
				return true
			},
			() => {
				if (this._fee < 0) {
					return 'Invalid fee: ' + this._fee / QORT_DECIMALS
				}
				return true
			},
			() => {
				if (this._groupID < 0 || !Number.isInteger(this._groupID)) {
					return 'Invalid groupID: ' + this._groupID
				}
				return true
			},
			() => {
				if (!(new Date(this._timestamp)).getTime() > 0) {
					return 'Invalid timestamp: ' + this._timestamp
				}
				return true
			},
			() => {
				if (!(this._lastReference instanceof Uint8Array && this._lastReference.byteLength == 64)) {
					if (this._lastReference == 0) {
						return 'Invalid last reference. Please ensure that you have at least 0.001 QORT for the transaction fee.'
					}
					return 'Invalid last reference: ' + this._lastReference
				}
				return true
			},
			() => {
				if (!(this._keyPair)) {
					return 'keyPair must be specified'
				}
				if (!(this._keyPair.publicKey instanceof Uint8Array && this._keyPair.publicKey.byteLength === 32)) {
					return 'Invalid publicKey'
				}
				if (!(this._keyPair.privateKey instanceof Uint8Array && this._keyPair.privateKey.byteLength === 64)) {
					return 'Invalid privateKey'
				}
				return true
			}
		]
	}

	render(html) {
		return html`render method to display requested transaction info`
	}

	set keyPair(keyPair) {
		this._keyPair = keyPair
	}

	set type(type) {
		this.typeText = TX_TYPES[type]
		this._type = type
		this._typeBytes = this.constructor.utils.int32ToBytes(this._type)
	}

	set groupID(groupID) {
		this._groupID = groupID
		this._groupIDBytes = this.constructor.utils.int32ToBytes(this._groupID)
	}

	set timestamp(timestamp) {
		this._timestamp = timestamp
		this._timestampBytes = this.constructor.utils.int64ToBytes(this._timestamp)
	}

	set fee(fee) {
		this._fee = fee * QORT_DECIMALS
		this._feeBytes = this.constructor.utils.int64ToBytes(this._fee)
	}

	set lastReference(lastReference) {
		this._lastReference = lastReference instanceof Uint8Array ? lastReference : this.constructor.Base58.decode(lastReference)
	}

	get params() {
		return [
			this._typeBytes,
			this._timestampBytes,
			this._groupIDBytes,
			this._lastReference,
			this._keyPair.publicKey
		]
	}

	get signedBytes() {
		if (!this._signedBytes) {
			this.sign()
		}
		return this._signedBytes
	}

	validParams() {
		let finalResult = {
			valid: true
		}
		this.tests.some(test => {
			const result = test()
			if (result !== true) {
				finalResult = {
					valid: false,
					message: result
				}
				return true // exists the loop
			}
		})
		return finalResult
	}

	generateBase() {
		const isValid = this.validParams()
		if (!isValid.valid) {
			throw new Error(isValid.message)
		}
		let result = new Uint8Array()

		this.params.forEach(item => {
			result = this.constructor.utils.appendBuffer(result, item)
		})

		this._base = result
		return result
	}

	sign() {
		if (!this._keyPair) {
			throw new Error('keyPair not defined')
		}

		if (!this._base) {
			this.generateBase()
		}

		this._signature = this.constructor.nacl.sign.detached(this._base, this._keyPair.privateKey)

		this._signedBytes = this.constructor.utils.appendBuffer(this._base, this._signature)

		return this._signature
	}
}