import type { Article } from './protocol.ts';

export const NETWORK = 'wikideck-randomx-testnet-2' as const;
export const CONSENSUS = {
  version: 2, targetSeconds: 30, retargetInterval: 10, medianWindow: 11,
  commitments: 'sha256-domain-separated-counted-merkle-v1', randomx: '1.2.1', powEndian: 'big',
  maxFutureSeconds: 120, epochBlocks: 2048, epochDelay: 64,
  maxTransactions: 64, coinbaseMaturity: 2, maxBlockBytes: 64 * 1024,
} as const;
export type NftTransfer = {
  network: typeof NETWORK; chainId: string; cardHash: string; from: string; to: string;
  sequence: number; publicKey: string; signature: string;
};
export type BlockHeader = {
  version: 2; network: typeof NETWORK; chainId: string; height: number;
  previousHash: string; createdAt: number; article: Article;
  owner: string; publicKey: string; nonce: number; target: string; key: string;
  transactionsRoot: string; stateRoot: string;
};
export type TestnetBlock = BlockHeader & {
  hash: string; tokenId: string; powHash: string; signature: string; transactions: NftTransfer[];
};
export type MiningTemplate = {
  header: BlockHeader; transactions: NftTransfer[]; blob: string; nonceOffset: number;
};
export type NftState = Record<string, { owner: string; sequence: number; mintedHeight: number; pageId: number }>;
export type TestnetSnapshot = {
  network: typeof NETWORK; chainId: string; genesis: string; tip: string; cumulativeWork: string;
  blocks: TestnetBlock[]; transfers: NftTransfer[]; pendingTransfers: NftTransfer[];
  nextArticle: Article; peers: number; algorithm: 'RandomX'; maturity: number;
};
export function nftTransferMessage(t: Omit<NftTransfer, 'publicKey' | 'signature'>): string {
  return JSON.stringify([NETWORK, 'nft-transfer', t.chainId, t.cardHash, t.from, t.to, t.sequence]);
}
export function articleTuple(a: Article): unknown[] {
  return [a.pageId, a.revisionId, a.title, a.extract, a.image ?? '', a.url, a.source, a.category];
}
export function headerMessage(h: BlockHeader): string {
  return JSON.stringify([NETWORK, h.version, h.chainId, h.height, h.previousHash, h.createdAt,
    articleTuple(h.article), h.owner, h.publicKey, h.target, h.key, h.transactionsRoot, h.stateRoot]);
}
export function blockClaimMessage(hash: string): string {
  return JSON.stringify([NETWORK, 'block-claim', hash]);
}
export function testnetOwnerOf(state: Pick<TestnetSnapshot, 'blocks' | 'transfers'>, hash: string): string | undefined {
  let owner = state.blocks.find(b => b.tokenId === hash)?.owner;
  for (const t of state.transfers) if (t.cardHash === hash) owner = t.to;
  return owner;
}