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import { BlockChainApi, BlockType, DataType } from "./helper.d.ts";import { searchGenerator, iteratorGenerator } from "./generators.ts"import { Block } from "./blockNode.ts";
export class BlockChain implements BlockChainApi {	#chain: Array<any>	length: number
	constructor() {		this.#chain = new Array()		this.length = this.#chain.length	}
	static createBlockChain() {		return new this();	}
	createBlock(data: DataType<any>) {		const newBlock = new Block(data, this.#chain.length + 1)
		if (this.#chain.length === 0) {			this.#chain.push(newBlock)			this.length++
			return true		}
		if (this.#chain.length > 0) {			const prevBlock = this.latestBlock()			newBlock.prevHash = prevBlock!.hash			this.#chain.push(newBlock)			this.length++
			return true		}
		return false	}
	search(key: null|string, index: null|number = null) {		if (this.#chain.length === 0) {			return false		}
		if (key) {			const iterator = searchGenerator(key, this.#chain)			let iteratorNext = iterator.next()			if (iteratorNext.value) {				return iteratorNext.value			}		}
		if (index) {			return this.#chain[index - 1]		}
		return false;	}
	latestBlock() {		if (this.#chain.length <= 0) return false		return this.#chain[this.#chain.length - 1]	}
	iterator() {		return iteratorGenerator(this.#chain)	}
	checkValidation() {		const iterator = this.iterator()		let iteratNext = iterator.next()		let prevHash: null|string = null		let prevBlock: null|BlockType = null
		while (iteratNext.value) {			const block = iteratNext.value			const regeneratedHash = block.regenerateHash()			if (block.hash !== regeneratedHash) {				console.error(`index: ${block.index}, block is corrupted`)				return false			}			if (prevBlock != null && block.prevHash !== prevHash) {				console.error(`index: ${prevBlock!.index}, block is corrupted`)				return false			}
			prevHash = block.regenerateHash()			prevBlock = block			iteratNext = iterator.next()		}
		console.log('The Chain is valid.')		return true	}
	log(key: null|string = null, index: null|number = null) {		if (key) {			return console.log(this.search(key))		}
		if (index) {			return console.log(this.#chain[index - 1])		}
		console.log(this.#chain)	}
}