/**
 * 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,
  getPapiSigner,
  logger,
  parseDeploymentsFile,
  SUBSTRATE_FUNDED_ACCOUNTS,
  waitForDataHavenEvent,
  waitForEthereumEvent
} from "utils";
import { decodeEventLog, encodeAbiParameters, parseEther } from "viem";
import { gatewayAbi } from "../contract-bindings";
import { BaseTestSuite } from "../framework";

// Constants
// The actual Ethereum sovereign account used by the runtime (derived from runtime configuration)
const ETHEREUM_SOVEREIGN_ACCOUNT = "0xd8030FB68Aa5B447caec066f3C0BdE23E6db0a05";
const ZERO_ADDRESS = "0x0000000000000000000000000000000000000000";

let deployments: any;

// Minimal ERC20 ABI for reading token metadata and Transfer events
const ERC20_ABI = [
  {
    inputs: [],
    name: "name",
    outputs: [{ name: "", type: "string" }],
    stateMutability: "view",
    type: "function"
  },
  {
    inputs: [],
    name: "symbol",
    outputs: [{ name: "", type: "string" }],
    stateMutability: "view",
    type: "function"
  },
  {
    inputs: [],
    name: "decimals",
    outputs: [{ name: "", type: "uint8" }],
    stateMutability: "view",
    type: "function"
  },
  {
    inputs: [{ name: "account", type: "address" }],
    name: "balanceOf",
    outputs: [{ name: "", type: "uint256" }],
    stateMutability: "view",
    type: "function"
  },
  {
    inputs: [],
    name: "totalSupply",
    outputs: [{ name: "", type: "uint256" }],
    stateMutability: "view",
    type: "function"
  },
  {
    type: "event",
    name: "Transfer",
    inputs: [
      { name: "from", type: "address", indexed: true },
      { name: "to", type: "address", indexed: true },
      { name: "value", type: "uint256", indexed: false }
    ]
  },
  {
    inputs: [
      { name: "spender", type: "address" },
      { name: "value", type: "uint256" }
    ],
    name: "approve",
    outputs: [{ name: "", type: "bool" }],
    stateMutability: "nonpayable",
    type: "function"
  }
] as const;

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

  // The actual token ID that gets registered by the runtime
  // This is computed by the runtime's TokenIdOf converter which uses
  // DescribeGlobalPrefix to encode the reanchored location
  const tokenId =
    "0x68c3bfa36acaeb2d97b73d1453652c6ef27213798f88842ec3286846e8ee4d3a" as `0x${string}`;

  const tokenAddress = (await connectors.publicClient.readContract({
    address: deployments.Gateway,
    abi: gatewayAbi,
    functionName: "tokenAddressOf",
    args: [tokenId]
  })) as `0x${string}`;

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

class NativeTokenTransferTestSuite extends BaseTestSuite {
  constructor() {
    super({
      suiteName: "native-token-transfer",
      networkOptions: {
        slotTime: 2
      }
    });

    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();
  });
  it("should register DataHaven native token on Ethereum", async () => {
    const connectors = suite.getTestConnectors();
    // First, check if token is already registered
    const existingTokenAddress = await getNativeERC20Address(connectors);
    expect(existingTokenAddress).toBeNull();

    // Register token via sudo
    const registerTx = 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
      }
    });

    // Create and sign the transaction
    const sudoTx = connectors.dhApi.tx.Sudo.sudo({
      call: registerTx.decodedCall
    });

    // Submit transaction and wait for both DataHaven confirmation and Ethereum event
    const [ethEventResult, dhTxResult] = await Promise.all([
      // Wait for the token registration event on Ethereum Gateway (start watcher first)
      waitForEthereumEvent({
        client: connectors.publicClient,
        address: deployments.Gateway,
        abi: gatewayAbi,
        eventName: "ForeignTokenRegistered",
        timeout: 300_000 // set appropriately
      }),
      // Submit and wait for transaction on DataHaven
      sudoTx.signAndSubmit(alithSigner)
    ]);

    // Verify DataHaven transaction succeeded
    expect(dhTxResult.ok).toBe(true);

    // Verify the Ethereum event was received
    expect(ethEventResult.log).not.toBeNull();

    // Check for events in the DataHaven transaction result
    const { events } = dhTxResult;

    const sudoEvent = events.find((e: any) => e.type === "Sudo" && e.value.type === "Sudid");
    expect(sudoEvent).toBeDefined();

    // Find SnowbridgeSystemV2.RegisterToken event
    const registerTokenEvent = events.find(
      (e: any) => e.type === "SnowbridgeSystemV2" && e.value.type === "RegisterToken"
    );
    expect(registerTokenEvent).toBeDefined();

    const tokenIdRaw = registerTokenEvent?.value?.value?.foreign_token_id;
    expect(tokenIdRaw).toBeDefined();
    const tokenId = tokenIdRaw.asHex();

    const eventArgs = (ethEventResult.log as any)?.args;
    expect(eventArgs?.tokenID).toBe(tokenId);

    // Get the deployed token address from the event
    const deployedERC20Address = eventArgs?.token as `0x${string}`;
    expect(deployedERC20Address).not.toBe(ZERO_ADDRESS);

    logger.debug(`ERC20 token deployed at: ${deployedERC20Address}`);

    const [tokenName, tokenSymbol, tokenDecimals] = await Promise.all([
      connectors.publicClient.readContract({
        address: deployedERC20Address,
        abi: ERC20_ABI,
        functionName: "name"
      }) as Promise<string>,
      connectors.publicClient.readContract({
        address: deployedERC20Address,
        abi: ERC20_ABI,
        functionName: "symbol"
      }) as Promise<string>,
      connectors.publicClient.readContract({
        address: deployedERC20Address,
        abi: ERC20_ABI,
        functionName: "decimals"
      }) as Promise<number>
    ]);

    expect(tokenName).toBe("HAVE");
    expect(tokenSymbol).toBe("wHAVE");
    expect(tokenDecimals).toBe(18);
  }, 300_000); // 5 minute timeout for registration

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

    // Get the deployed token address
    const maybeErc20 = await getNativeERC20Address(connectors);
    expect(maybeErc20).not.toBeNull();
    const erc20Address = maybeErc20 as `0x${string}`;

    const recipient = ANVIL_FUNDED_ACCOUNTS[0].publicKey;
    const amount = parseEther("100");
    const fee = parseEther("1");

    // Get initial balances including sovereign account
    const initialDHBalance = await connectors.dhApi.query.System.Account.getValue(
      SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey
    );

    const initialSovereignBalance = await connectors.dhApi.query.System.Account.getValue(
      ETHEREUM_SOVEREIGN_ACCOUNT
    );

    const initialWrappedHaveBalance = (await connectors.publicClient.readContract({
      address: erc20Address,
      abi: ERC20_ABI,
      functionName: "balanceOf",
      args: [recipient]
    })) as bigint;

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

    // Submit transaction and wait for both DataHaven confirmation and Ethereum minting event
    logger.debug("Waiting for Ethereum minting event (this may take several minutes)...");

    const [tokenMintEvent, txResult] = await Promise.all([
      // Wait for the mint event on Ethereum (start watcher first)
      waitForEthereumEvent({
        client: connectors.publicClient,
        address: erc20Address,
        abi: ERC20_ABI,
        eventName: "Transfer",
        args: {
          from: ZERO_ADDRESS, // Minting from zero address
          to: recipient
        },
        timeout: 300_000 // 5 minutes should be sufficient
      }),
      // Submit and wait for transaction on DataHaven
      tx.signAndSubmit(alithSigner)
    ]);

    // Check transaction result for errors
    expect(txResult.ok).toBe(true);

    // Extract events directly from transaction result
    const tokenTransferEvent = txResult.events.find(
      (e: any) =>
        e.type === "DataHavenNativeTransfer" &&
        e.value?.type === "TokensTransferredToEthereum" &&
        e.value?.value?.from === SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey
    );

    const tokensLockedEvent = txResult.events.find(
      (e: any) =>
        e.type === "DataHavenNativeTransfer" &&
        e.value?.type === "TokensLocked" &&
        e.value?.value?.account === SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey
    );

    // Verify DataHaven events were received
    expect(tokenTransferEvent).toBeDefined();
    expect(tokenTransferEvent?.value?.value).toBeDefined();
    expect(tokensLockedEvent).toBeDefined();
    expect(tokensLockedEvent?.value?.value).toBeDefined();
    logger.debug("DataHaven event confirmed, message should be queued for relayers");

    // Check sovereign account balance after block finalization
    const intermediateBalance = await connectors.dhApi.query.System.Account.getValue(
      ETHEREUM_SOVEREIGN_ACCOUNT
    );
    logger.debug(`Sovereign balance after events: ${intermediateBalance.data.free}`);

    // Get final balances including sovereign account
    const finalDHBalance = await connectors.dhApi.query.System.Account.getValue(
      SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey
    );

    const finalSovereignBalance = await connectors.dhApi.query.System.Account.getValue(
      ETHEREUM_SOVEREIGN_ACCOUNT
    );

    const finalWrappedHaveBalance = (await connectors.publicClient.readContract({
      address: erc20Address,
      abi: ERC20_ABI,
      functionName: "balanceOf",
      args: [recipient]
    })) as bigint;

    // If Ethereum event was not received, provide diagnostic information
    // Verify results only if Ethereum event was received
    if (tokenMintEvent.log) {
      // Verify user balance decreased by amount + fee + transaction fee
      expect(finalDHBalance.data.free).toBeLessThan(initialDHBalance.data.free);
      const dhDecrease = initialDHBalance.data.free - finalDHBalance.data.free;

      // Calculate the transaction fee from the actual balance change
      const txFee = dhDecrease - (amount + fee);

      // Verify the total decrease is at least the amount + fee
      expect(dhDecrease).toBeGreaterThanOrEqual(amount + fee);

      // Verify the transaction fee is reasonable (less than 0.01 HAVE)
      expect(txFee).toBeLessThan(parseEther("0.01"));
      expect(txFee).toBeGreaterThan(0n);

      // Verify sovereign account balance increased by exactly the amount (not the fee)
      const sovereignIncrease = finalSovereignBalance.data.free - initialSovereignBalance.data.free;
      expect(sovereignIncrease).toBe(amount);

      // Verify wrapped token balance increased by the amount
      expect(finalWrappedHaveBalance).toBeGreaterThan(initialWrappedHaveBalance);
      const wrappedHaveIncrease = finalWrappedHaveBalance - initialWrappedHaveBalance;
      expect(wrappedHaveIncrease).toBe(amount);
    } else {
      // Compact diagnostics and fail the test with a helpful message
      const dhDecrease = initialDHBalance.data.free - finalDHBalance.data.free;
      const sovereignIncrease = finalSovereignBalance.data.free - initialSovereignBalance.data.free;
      const ethBalanceChange = finalWrappedHaveBalance - initialWrappedHaveBalance;

      const summary = `Ethereum mint event not observed within timeout. DHΔ=${dhDecrease}, SovereignΔ=${sovereignIncrease}, ERC20Δ=${ethBalanceChange}`;
      logger.warn(summary);
      expect(tokenMintEvent.log).not.toBeNull();
    }
  }, 420_000); // 7 minute timeout

  it("should maintain 1:1 backing ratio", async () => {
    const connectors = suite.getTestConnectors();

    // Get the deployed token address
    const maybeErc20 = await getNativeERC20Address(connectors);
    expect(maybeErc20).not.toBeNull();
    const erc20Address = maybeErc20 as `0x${string}`;

    const totalSupply = (await connectors.publicClient.readContract({
      address: erc20Address,
      abi: ERC20_ABI,
      functionName: "totalSupply"
    })) as bigint;

    const sovereignBalance = await connectors.dhApi.query.System.Account.getValue(
      ETHEREUM_SOVEREIGN_ACCOUNT
    );

    expect(sovereignBalance.data.free).toBeGreaterThanOrEqual(totalSupply);
  });

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

    // Resolve deployed ERC20 for native token; if missing, register via sudo
    const maybeErc20 = await getNativeERC20Address(connectors);
    expect(maybeErc20).not.toBeNull();
    const erc20Address = maybeErc20 as `0x${string}`;

    // Use shared wallet client from connectors
    const ethWalletClient = connectors.walletClient;
    const ethereumSender = ethWalletClient.account.address as `0x${string}`;

    // Destination on DataHaven is ALITH (AccountId20)
    const dhRecipient = SUBSTRATE_FUNDED_ACCOUNTS.ALITH.publicKey as `0x${string}`;

    const amount = parseEther("5");
    // v2 fees in ETH
    const executionFee = parseEther("0.1");
    const relayerFee = parseEther("0.4");

    // Ensure sender has enough wrapped tokens on Ethereum; if not, fund via DH -> ETH transfer
    let currentEthTokenBalance = (await connectors.publicClient.readContract({
      address: erc20Address,
      abi: ERC20_ABI,
      functionName: "balanceOf",
      args: [ethereumSender]
    })) as bigint;
    if (currentEthTokenBalance < amount) {
      const mintAmount = amount - currentEthTokenBalance;
      const fee = parseEther("0.01");
      const tx = connectors.dhApi.tx.DataHavenNativeTransfer.transfer_to_ethereum({
        recipient: FixedSizeBinary.fromHex(ethereumSender) as FixedSizeBinary<20>,
        amount: mintAmount,
        fee
      });

      // Start watcher first and submit in parallel; look back one block for safety
      const startBlock = await connectors.publicClient.getBlockNumber();
      const fromBlock = startBlock > 0n ? startBlock - 1n : startBlock;
      const [mintEvent, txResult] = await Promise.all([
        waitForEthereumEvent({
          client: connectors.publicClient,
          address: erc20Address,
          abi: ERC20_ABI,
          eventName: "Transfer",
          args: { from: ZERO_ADDRESS, to: ethereumSender },
          fromBlock,
          timeout: 300_000 // 3 minutes
        }),
        tx.signAndSubmit(alithSigner)
      ]);

      expect(txResult.ok).toBe(true);
      expect(mintEvent.log).not.toBeNull();

      currentEthTokenBalance = (await connectors.publicClient.readContract({
        address: erc20Address,
        abi: ERC20_ABI,
        functionName: "balanceOf",
        args: [ethereumSender]
      })) as bigint;
    }

    // Capture initial balances and supply for ETH -> DH leg
    const [initialEthTokenBalance, initialTotalSupply] = await Promise.all([
      connectors.publicClient.readContract({
        address: erc20Address,
        abi: ERC20_ABI,
        functionName: "balanceOf",
        args: [ethereumSender]
      }) as Promise<bigint>,
      connectors.publicClient.readContract({
        address: erc20Address,
        abi: ERC20_ABI,
        functionName: "totalSupply"
      }) as Promise<bigint>
    ]);
    expect(initialEthTokenBalance).toBeGreaterThanOrEqual(amount);

    const initialDhRecipientBalance =
      await connectors.dhApi.query.System.Account.getValue(dhRecipient);
    const initialSovereignBalance = await connectors.dhApi.query.System.Account.getValue(
      ETHEREUM_SOVEREIGN_ACCOUNT
    );

    // Approve Gateway to pull tokens
    const approveHash = await ethWalletClient.writeContract({
      address: erc20Address,
      abi: ERC20_ABI,
      functionName: "approve",
      args: [deployments.Gateway as `0x${string}`, amount],
      chain: null
    });
    const approveReceipt = await connectors.publicClient.waitForTransactionReceipt({
      hash: approveHash
    });
    expect(approveReceipt.status).toBe("success");

    // Build Snowbridge v2 send payload
    const assets = [
      encodeAbiParameters(
        [
          { name: "kind", type: "uint8" },
          { name: "token", type: "address" },
          { name: "value", type: "uint128" }
        ],
        [0, erc20Address, amount]
      )
    ];

    // The claimer should be the recipient on DataHaven (dhRecipient)
    // This tells the system who should receive the unlocked tokens
    const claimer = dhRecipient as `0x${string}`;
    logger.info(`🔑 Setting claimer to: ${claimer} (matches dhRecipient: ${dhRecipient})`);

    // For now, we can use an empty XCM since the claimer field specifies the recipient
    // The Snowbridge system will handle the token unlock to the claimer address
    const xcm = "0x" as `0x${string}`;

    // Start DH event watcher BEFORE sending Ethereum tx to avoid missing the event
    logger.debug("Starting TokensUnlocked watcher on DataHaven before sending Ethereum tx...");
    const dhEventPromise = waitForDataHavenEvent<{
      account: any;
      amount: any;
    }>({
      api: connectors.dhApi,
      pallet: "DataHavenNativeTransfer",
      event: "TokensUnlocked",
      filter: (e: any) => {
        const acct =
          typeof e?.account === "string"
            ? e.account
            : (e?.account?.asHex?.() ?? e?.account?.toString?.());
        const amt = typeof e?.amount === "bigint" ? e.amount : BigInt(e?.amount ?? 0);
        const isMatch = acct?.toLowerCase?.() === dhRecipient.toLowerCase() && amt === amount;
        if (isMatch) {
          logger.debug(`Matched TokensUnlocked: account=${acct}, amount=${amt}`);
        }
        return Boolean(isMatch);
      },
      timeout: 600_000
    });

    // Send v2_sendMessage and assert hash before awaiting all
    logger.info(
      `🚀 Submitting Ethereum transaction: ${amount} tokens to DataHaven recipient ${dhRecipient}`
    );
    const sendHash = await ethWalletClient.writeContract({
      address: deployments.Gateway as `0x${string}`,
      abi: gatewayAbi,
      functionName: "v2_sendMessage",
      args: [xcm, assets as any, claimer, executionFee, relayerFee],
      value: executionFee + relayerFee,
      chain: null
    });
    expect(sendHash).toMatch(/^0x[0-9a-fA-F]{64}$/);
    // Await both Ethereum receipt and DH TokensUnlocked event together
    const [sendReceipt, dhEvent] = await Promise.all([
      connectors.publicClient.waitForTransactionReceipt({ hash: sendHash }),
      dhEventPromise
    ]);
    expect(sendReceipt.status).toBe("success");

    // Assert OutboundMessageAccepted from receipt logs
    const hasOutboundAccepted = (sendReceipt.logs ?? []).some((log: any) => {
      try {
        const decoded = decodeEventLog({ abi: gatewayAbi, data: log.data, topics: log.topics });
        return decoded.eventName === "OutboundMessageAccepted";
      } catch {
        return false;
      }
    });
    expect(hasOutboundAccepted).toBe(true);

    // Event must exist (filter already matched account and amount)
    expect(dhEvent?.data).toBeDefined();

    // Final balances
    const [finalEthTokenBalance, finalTotalSupply] = await Promise.all([
      connectors.publicClient.readContract({
        address: erc20Address,
        abi: ERC20_ABI,
        functionName: "balanceOf",
        args: [ethereumSender]
      }) as Promise<bigint>,
      connectors.publicClient.readContract({
        address: erc20Address,
        abi: ERC20_ABI,
        functionName: "totalSupply"
      }) as Promise<bigint>
    ]);

    const finalDhRecipientBalance =
      await connectors.dhApi.query.System.Account.getValue(dhRecipient);
    const finalSovereignBalance = await connectors.dhApi.query.System.Account.getValue(
      ETHEREUM_SOVEREIGN_ACCOUNT
    );

    // Assertions: burn on Ethereum and unlock on DataHaven
    expect(finalEthTokenBalance).toBe(initialEthTokenBalance - amount);
    expect(finalTotalSupply).toBe(initialTotalSupply - amount);

    const dhIncrease = finalDhRecipientBalance.data.free - initialDhRecipientBalance.data.free;
    const sovereignDecrease = initialSovereignBalance.data.free - finalSovereignBalance.data.free;

    expect(dhIncrease).toBe(amount);
    expect(sovereignDecrease).toBe(amount);
  }, 900_000); // 15 minute timeout for cross-chain transfers
});