/**
 * Native Token Transfer E2E Tests
 *
 * Tests the native HAVE token transfer functionality between DataHaven and Ethereum
 * using the Snowbridge cross-chain messaging protocol.
 *
 * Prerequisites:
 * - DataHaven network with DataHavenNativeTransfer pallet
 * - Ethereum network with Gateway contract
 * - Snowbridge relayers running
 * - Sudo access for token registration
 */

import { beforeAll, describe, expect, it } from "bun:test";
import { Binary } from "@polkadot-api/substrate-bindings";
import { FixedSizeBinary } from "polkadot-api";
import {
  ANVIL_FUNDED_ACCOUNTS,
  CROSS_CHAIN_TIMEOUTS,
  getPapiSigner,
  logger,
  parseDeploymentsFile,
  SUBSTRATE_FUNDED_ACCOUNTS,
  waitForDataHavenEvent,
  waitForEthereumEvent,
  ZERO_ADDRESS
} from "utils";
import { decodeEventLog, encodeAbiParameters, erc20Abi, parseEther, parseEventLogs } from "viem";
import { gatewayAbi } from "../../contract-bindings";
import { BaseTestSuite } from "../framework";
import type { TestConnectors } from "../framework/connectors";

// Dynamic values fetched from runtime
let ethereumSovereignAccount: string;
let nativeTokenId: `0x${string}` | null = null;

interface BalanceSnapshot {
  dh: bigint;
  sovereign: bigint;
  erc20: bigint;
}

async function getBalanceSnapshot(
  connectors: Pick<TestConnectors, "dhApi" | "publicClient">,
  opts: { dhAccount?: string; ethAccount?: `0x${string}`; erc20Address?: `0x${string}` }
): Promise<BalanceSnapshot> {
  const { dhApi, publicClient } = connectors;
  const { dhAccount, ethAccount, erc20Address } = opts;

  const [dhBalance, sovereignBalance, erc20Balance] = await Promise.all([
    dhAccount ? dhApi.query.System.Account.getValue(dhAccount) : null,
    dhApi.query.System.Account.getValue(ethereumSovereignAccount),
    erc20Address && ethAccount
      ? publicClient.readContract({
          address: erc20Address,
          abi: erc20Abi,
          functionName: "balanceOf",
          args: [ethAccount]
        })
      : 0n
  ]);

  return {
    dh: dhBalance?.data.free ?? 0n,
    sovereign: sovereignBalance.data.free,
    erc20: erc20Balance as bigint
  };
}

function expectBalanceDeltas(
  before: BalanceSnapshot,
  after: BalanceSnapshot,
  expected: { dhMin?: bigint; dhExact?: bigint; sovereign?: bigint; erc20?: bigint }
): void {
  if (expected.dhMin !== undefined) {
    const decrease = before.dh - after.dh;
    expect(decrease).toBeGreaterThanOrEqual(expected.dhMin);
    expect(decrease - expected.dhMin).toBeLessThan(parseEther("0.01")); // tx fee sanity check
  }
  if (expected.dhExact !== undefined) {
    expect(after.dh - before.dh).toBe(expected.dhExact);
  }
  if (expected.sovereign !== undefined) {
    expect(after.sovereign - before.sovereign).toBe(expected.sovereign);
  }
  if (expected.erc20 !== undefined) {
    expect(after.erc20 - before.erc20).toBe(expected.erc20);
  }
}

let deployments: any;

async function getNativeERC20Address(connectors: any): Promise<`0x${string}` | null> {
  if (!deployments) throw new Error("Global deployments not initialized");
  if (!nativeTokenId) return null;

  // Query the ERC20 address from Gateway using the token ID from registration
  const tokenAddress = (await connectors.publicClient.readContract({
    address: deployments!.Gateway,
    abi: gatewayAbi,
    functionName: "tokenAddressOf",
    args: [nativeTokenId]
  })) as `0x${string}`;

  return tokenAddress === ZERO_ADDRESS ? null : tokenAddress;
}

async function requireNativeERC20Address(connectors: any): Promise<`0x${string}`> {
  const address = await getNativeERC20Address(connectors);
  if (!address) {
    throw new Error(
      `Native ERC20 address not available (nativeTokenId=${nativeTokenId ?? "null"}). ` +
        `Did the 'register DataHaven native token on Ethereum' test succeed?`
    );
  }
  return address;
}

class NativeTokenTransferTestSuite extends BaseTestSuite {
  constructor() {
    super({ suiteName: "native-token-transfer" });
    this.setupHooks();
  }
}

// Create the test suite instance
const suite = new NativeTokenTransferTestSuite();

// Create shared signer instance to maintain nonce tracking across tests
let alithSigner: ReturnType<typeof getPapiSigner>;

describe("Native Token Transfer", () => {
  beforeAll(async () => {
    alithSigner = getPapiSigner("ALITH");
    deployments = await parseDeploymentsFile();

    const connectors = suite.getTestConnectors();
    ethereumSovereignAccount = await (
      connectors.dhApi.constants as any
    ).DataHavenNativeTransfer.EthereumSovereignAccount();
    logger.debug(`Ethereum sovereign account: ${ethereumSovereignAccount}`);
  });

  it(
    "should register DataHaven native token on Ethereum",
    async () => {
      const connectors = suite.getTestConnectors();

      // Ensure token is not already deployed (nativeTokenId is null until registered)
      expect(await getNativeERC20Address(connectors)).toBeNull();

      const fromBlock = await connectors.publicClient.getBlockNumber();

      // Build transaction to register token
      const sudoTx = connectors.dhApi.tx.Sudo.sudo({
        call: connectors.dhApi.tx.SnowbridgeSystemV2.register_token({
          sender: {
            type: "V5",
            value: { parents: 0, interior: { type: "Here", value: undefined } }
          },
          asset_id: {
            type: "V5",
            value: { parents: 0, interior: { type: "Here", value: undefined } }
          },
          metadata: {
            name: Binary.fromText("HAVE"),
            symbol: Binary.fromText("wHAVE"),
            decimals: 18
          }
        }).decodedCall
      });

      const dhTxResult = await sudoTx.signAndSubmit(alithSigner);
      expect(dhTxResult.ok).toBe(true);

      // Verify token IDs match across chains and store for subsequent tests
      const registerEvent = dhTxResult.events.find(
        (e: any) => e.type === "SnowbridgeSystemV2" && e.value?.type === "RegisterToken"
      );
      expect(registerEvent).toBeDefined();
      nativeTokenId = registerEvent!.value.value.foreign_token_id.asHex();
      logger.debug(`Native token ID: ${nativeTokenId}`);

      // Wait for cross-chain confirmation after we have the token ID (and filter by it).
      const ethEvent = await waitForEthereumEvent({
        client: connectors.publicClient,
        address: deployments!.Gateway,
        abi: gatewayAbi,
        eventName: "ForeignTokenRegistered",
        args: { tokenID: nativeTokenId },
        fromBlock: fromBlock > 0n ? fromBlock - 1n : fromBlock,
        timeout: CROSS_CHAIN_TIMEOUTS.DH_TO_ETH_MS
      });

      const { args: ethTokenEvent } = decodeEventLog({
        abi: gatewayAbi,
        eventName: "ForeignTokenRegistered",
        data: ethEvent.data,
        topics: ethEvent.topics
      }) as { args: { tokenID: string; token: `0x${string}` } };

      expect(ethTokenEvent.tokenID).toBe(nativeTokenId!);

      // Verify ERC20 metadata
      const deployedERC20 = ethTokenEvent.token;
      logger.debug(`DataHaven native token deployed at: ${deployedERC20}`);

      const [name, symbol, decimals] = await Promise.all([
        connectors.publicClient.readContract({
          address: deployedERC20,
          abi: erc20Abi,
          functionName: "name"
        }),
        connectors.publicClient.readContract({
          address: deployedERC20,
          abi: erc20Abi,
          functionName: "symbol"
        }),
        connectors.publicClient.readContract({
          address: deployedERC20,
          abi: erc20Abi,
          functionName: "decimals"
        })
      ]);

      expect(name).toBe("HAVE");
      expect(symbol).toBe("wHAVE");
      expect(decimals).toBe(18);
    },
    CROSS_CHAIN_TIMEOUTS.DH_TO_ETH_MS + CROSS_CHAIN_TIMEOUTS.EVENT_CONFIRMATION_MS
  );

  it(
    "should transfer tokens from DataHaven to Ethereum",
    async () => {
      const connectors = suite.getTestConnectors();

      const erc20Address = await requireNativeERC20Address(connectors);

      // Set up transfer parameters
      const recipient = ANVIL_FUNDED_ACCOUNTS[0].publicKey;
      const amount = parseEther("100");
      const fee = parseEther("1");

      // Capture initial balances
      const before = await getBalanceSnapshot(connectors, {
        dhAccount: SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey,
        ethAccount: recipient,
        erc20Address
      });

      // Build transfer transaction
      const tx = connectors.dhApi.tx.DataHavenNativeTransfer.transfer_to_ethereum({
        recipient: FixedSizeBinary.fromHex(recipient) as FixedSizeBinary<20>,
        amount,
        fee
      });

      // Submit transaction and wait for cross-chain confirmation
      const startBlock = await connectors.publicClient.getBlockNumber();
      const dhTxResult = await tx.signAndSubmit(alithSigner);
      expect(dhTxResult.ok).toBe(true);

      await waitForEthereumEvent({
        client: connectors.publicClient,
        address: erc20Address,
        abi: erc20Abi,
        eventName: "Transfer",
        args: { from: ZERO_ADDRESS, to: recipient },
        fromBlock: startBlock > 0n ? startBlock - 1n : startBlock,
        timeout: CROSS_CHAIN_TIMEOUTS.DH_TO_ETH_MS
      });

      // Verify DataHaven events
      expect(
        dhTxResult.events.find(
          (e: any) =>
            e.type === "DataHavenNativeTransfer" &&
            e.value?.type === "TokensTransferredToEthereum" &&
            e.value?.value?.from === SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey
        )
      ).toBeDefined();
      expect(
        dhTxResult.events.find(
          (e: any) =>
            e.type === "DataHavenNativeTransfer" &&
            e.value?.type === "TokensLocked" &&
            e.value?.value?.account === SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey
        )
      ).toBeDefined();

      // Capture final balances
      const after = await getBalanceSnapshot(connectors, {
        dhAccount: SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey,
        ethAccount: recipient,
        erc20Address
      });

      // Verify balance changes
      expectBalanceDeltas(before, after, {
        dhMin: amount + fee,
        sovereign: amount,
        erc20: amount
      });

      // Verify 1:1 backing ratio is maintained
      const totalSupply = (await connectors.publicClient.readContract({
        address: erc20Address,
        abi: erc20Abi,
        functionName: "totalSupply"
      })) as bigint;

      const sovereignBalance =
        await connectors.dhApi.query.System.Account.getValue(ethereumSovereignAccount);
      expect(sovereignBalance.data.free).toBeGreaterThanOrEqual(totalSupply);
    },
    CROSS_CHAIN_TIMEOUTS.DH_TO_ETH_MS + CROSS_CHAIN_TIMEOUTS.EVENT_CONFIRMATION_MS
  );

  it(
    "should transfer tokens from Ethereum to DataHaven",
    async () => {
      const connectors = suite.getTestConnectors();

      const erc20Address = await requireNativeERC20Address(connectors);
      const ethWalletClient = connectors.walletClient;
      const ethereumSender = ethWalletClient.account.address as `0x${string}`;
      const dhRecipient = SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey as `0x${string}`;

      const amount = parseEther("5");
      const executionFee = parseEther("0.1");
      const relayerFee = parseEther("0.4");

      // Capture initial balances and supply for ETH -> DH leg
      const [before, initialTotalSupply] = await Promise.all([
        getBalanceSnapshot(connectors, {
          dhAccount: dhRecipient,
          ethAccount: ethereumSender,
          erc20Address
        }),
        connectors.publicClient.readContract({
          address: erc20Address,
          abi: erc20Abi,
          functionName: "totalSupply"
        }) as Promise<bigint>
      ]);
      expect(before.erc20).toBeGreaterThanOrEqual(amount);

      // Send tokens to DataHaven via Gateway
      const sendHash = await ethWalletClient.writeContract({
        address: deployments!.Gateway as `0x${string}`,
        abi: gatewayAbi,
        functionName: "v2_sendMessage",
        args: [
          "0x" as `0x${string}`,
          [
            encodeAbiParameters(
              [
                { name: "kind", type: "uint8" },
                { name: "token", type: "address" },
                { name: "value", type: "uint128" }
              ],
              [0, erc20Address, amount]
            )
          ] as any,
          dhRecipient,
          executionFee,
          relayerFee
        ],
        value: executionFee + relayerFee,
        chain: null
      });
      const sendReceipt = await connectors.publicClient.waitForTransactionReceipt({
        hash: sendHash
      });
      expect(sendReceipt.status).toBe("success");

      // Assert OutboundMessageAccepted event was emitted
      const gatewayLogs = sendReceipt.logs!.filter(
        (log) => log.address.toLowerCase() === deployments!.Gateway.toLowerCase()
      );
      const decodedEvents = parseEventLogs({ abi: gatewayAbi, logs: gatewayLogs });
      const hasOutboundAccepted = decodedEvents.some(
        (event) => event.eventName === "OutboundMessageAccepted"
      );
      expect(hasOutboundAccepted).toBe(true);

      // Assert ERC20 was burned (Transfer to zero address)
      const erc20Logs = sendReceipt.logs!.filter(
        (log) => log.address.toLowerCase() === erc20Address.toLowerCase()
      );
      const transferEvents = parseEventLogs({ abi: erc20Abi, logs: erc20Logs });
      const burnEvent = transferEvents.find(
        (event) =>
          event.eventName === "Transfer" &&
          event.args.from?.toLowerCase() === ethereumSender.toLowerCase() &&
          event.args.to?.toLowerCase() === ZERO_ADDRESS.toLowerCase() &&
          event.args.value === amount
      );
      expect(burnEvent).toBeDefined();

      // Wait for relay (takes ~2-3 min due to Ethereum finality)
      await waitForDataHavenEvent<{ account: any; amount: bigint }>({
        api: connectors.dhApi,
        pallet: "DataHavenNativeTransfer",
        event: "TokensUnlocked",
        filter: (e) =>
          String(e.account).toLowerCase() === dhRecipient.toLowerCase() && e.amount === amount,
        timeout: CROSS_CHAIN_TIMEOUTS.ETH_TO_DH_MS
      });

      // Final balances
      const [after, finalTotalSupply] = await Promise.all([
        getBalanceSnapshot(connectors, {
          dhAccount: dhRecipient,
          ethAccount: ethereumSender,
          erc20Address
        }),
        connectors.publicClient.readContract({
          address: erc20Address,
          abi: erc20Abi,
          functionName: "totalSupply"
        }) as Promise<bigint>
      ]);

      // Assertions: burn on Ethereum and unlock on DataHaven
      expect(after.erc20).toBe(before.erc20 - amount);
      expect(finalTotalSupply).toBe(initialTotalSupply - amount);
      expectBalanceDeltas(before, after, {
        dhExact: amount, // recipient gets exactly amount
        sovereign: -amount // sovereign decreases by amount (unlocked)
      });
    },
    CROSS_CHAIN_TIMEOUTS.DH_TO_ETH_MS +
      CROSS_CHAIN_TIMEOUTS.ETH_TO_DH_MS +
      CROSS_CHAIN_TIMEOUTS.EVENT_CONFIRMATION_MS
  ); // includes funding (DH→ETH) + transfer (ETH→DH)
});