import axios from "axios";
import chalk from "chalk";
import * as fs from "fs";
import { join } from "path";
import yargs from "yargs";

import { TsRepl } from "./tsrepl";

export async function installedPackages(): Promise<string[]> {
  return new Promise((resolve, reject) => {
    fs.readFile(__dirname + "/../package.json", { encoding: "utf8" }, (error, data) => {
      if (error) {
        reject(error);
      } else {
        const packagejson = JSON.parse(data);
        const deps = Object.keys(packagejson.dependencies).sort();
        resolve(deps);
      }
    });
  });
}

export async function main(originalArgs: readonly string[]): Promise<void> {
  const args = yargs
    .options({
      // User options (we get --help and --version for free)
      init: {
        describe:
          "Read initial TypeScript code from the given sources. This can be URLs (supported schemes: https) or local file paths.",
        type: "array",
      },
      code: {
        describe:
          "Add initial TypeScript code from the argument. All code arguments are processed after all init arguments.",
        type: "array",
      },
      // Maintainer options
      debug: {
        describe: "Enable debugging",
        type: "boolean",
      },
      selftest: {
        describe: "Run a selftest and exit",
        type: "boolean",
      },
    })
    .group(["init", "code", "help", "version"], "User options")
    .group(["debug", "selftest"], "Maintainer options")
    .parse(originalArgs);

  console.info(chalk.green("Initializing session for you. Have fun!"));
  const visiblePackages = (await installedPackages()).filter(
    (name) => name.startsWith("@cosmjs/") || name === "axios",
  );
  console.info(chalk.yellow("The following packages have been installed and can be imported:"));
  console.info(chalk.yellow(visiblePackages.join(", ")));

  let init = "";
  if (args.selftest) {
    // execute some trival stuff and exit
    init += `
      import axios from "axios";
      import * as fs from "fs";

      import {
        fromAscii,
        fromBase64,
        fromHex,
        fromUtf8,
        toAscii,
        toBase64,
        toHex,
        toUtf8,
      } from "@cosmjs/encoding";
      import { sha512, Bip39, Random } from "@cosmjs/crypto";
      import {
        coins,
        encodeAminoPubkey,
        encodeBech32Pubkey,
        decodeBech32Pubkey,
        decodeAminoPubkey,
        makeCosmoshubPath,
        makeSignDoc,
        Secp256k1HdWallet,
        Secp256k1Wallet,
        StdFee,
      } from "@cosmjs/amino";
      import { Decimal } from "@cosmjs/math";
      import { assert, arrayContentEquals, sleep } from "@cosmjs/utils";

      await sleep(123);

      const readmeContent = fs.readFileSync(process.cwd() + "/README.md");
      fs.writeFileSync(process.cwd() + "/README.md", readmeContent);

      const hash = sha512(new Uint8Array([]));
      const hexHash = toHex(hash);
      export class NewDummyClass {};

      const original = "hello world";
      const encoded = toHex(toUtf8(toBase64(toAscii(original))));
      const decoded = fromAscii(fromBase64(fromUtf8(fromHex(encoded))));
      assert(decoded === original);

      assert(Decimal.fromAtomics("12870000", 6).toString() === "12.87");

      const oneKeyWallet = await Secp256k1Wallet.fromKey(fromHex("b8c462d2bb0c1a92edf44f735021f16c270f28ee2c3d1cb49943a5e70a3c763e"));
      const accounts = await oneKeyWallet.getAccounts();
      assert(accounts[0].address == "cosmos1kxt5x5q2l57ma2d434pqpafxdm0mgeg9c8cvtx");

      const mnemonic = Bip39.encode(Random.getBytes(16)).toString();
      const wallet = await Secp256k1HdWallet.fromMnemonic(mnemonic);
      const [{ address }] = await wallet.getAccounts();
      const data = toAscii("foo bar");
      const fee: StdFee = {
        amount: coins(5000000, "ucosm"),
        gas: "89000000",
      };
      const signDoc = makeSignDoc([], fee, "chain-xyz", "hello, world", 1, 2);
      const { signed, signature } = await wallet.signAmino(address, signDoc);
      assert(signed.memo === "hello, world");

      const bechPubkey = "coralvalconspub1zcjduepqvxg72ccnl9r65fv0wn3amlk4sfzqfe2k36l073kjx2qyaf6sk23qw7j8wq";
      assert(encodeBech32Pubkey(decodeBech32Pubkey(bechPubkey), "coralvalconspub") == bechPubkey);

      const aminoPubkey = fromHex("eb5ae98721034f04181eeba35391b858633a765c4a0c189697b40d216354d50890d350c70290");
      assert(arrayContentEquals(encodeAminoPubkey(decodeAminoPubkey(aminoPubkey)), aminoPubkey));

      console.info("Done testing, will exit now.");
      process.exit(0);
    `;
  }

  if (args.init) {
    for (const source of args.init.map((arg) => arg.toString())) {
      if (args.debug) console.info(`Adding code from: '${source}' ...`);
      if (source.startsWith("https://")) {
        const response = await axios.get(source);
        init += response.data + "\n";
      } else {
        init += fs.readFileSync(source, "utf8") + "\n";
      }
    }
  }

  if (args.code) {
    for (const code of args.code.map((arg) => arg.toString())) {
      if (args.debug) console.info(`Adding code: '${code}' ...`);
      init += `${code}\n`;
    }
  }

  const tsconfigPath = join(__dirname, "..", "tsconfig_repl.json");
  const installationDir = join(__dirname, "..");
  new TsRepl(tsconfigPath, init, !!args.debug, installationDir).start().catch((error) => {
    console.error(error);
    process.exit(1);
  });
}