export type StrategyId = "trend" | "guardian" | "maker" | "maker-points" | "offset-maker" | "basis" | "grid";

export interface CliOptions {
  strategy?: StrategyId;
  silent: boolean;
  help: boolean;
  exchange?: "aster" | "grvt" | "lighter" | "backpack" | "paradex" | "nado" | "standx";
}

const STRATEGY_VALUES = new Set<StrategyId>([
  "trend",
  "guardian",
  "maker",
  "maker-points",
  "offset-maker",
  "basis",
  "grid",
]);

export function parseCliArgs(argv: string[] = process.argv.slice(2)): CliOptions {
  const options: CliOptions = { silent: false, help: false };

  for (let i = 0; i < argv.length; i += 1) {
    const arg = argv[i];
    if (!arg) continue;

    if (arg === "--silent" || arg === "-q" || arg === "--quiet") {
      options.silent = true;
      continue;
    }
    if (arg === "--help" || arg === "-h") {
      options.help = true;
      continue;
    }
    if (arg.startsWith("--strategy=")) {
      const value = arg.split("=", 2)[1] ?? "";
      assignStrategy(options, value);
      continue;
    }
    if (arg === "--strategy" || arg === "-s") {
      const value = argv[i + 1];
      if (value) {
        assignStrategy(options, value);
        i += 1;
      }
      continue;
    }
    if (arg.startsWith("--exchange=")) {
      const value = arg.split("=", 2)[1] ?? "";
      assignExchange(options, value);
      continue;
    }
    if (arg === "--exchange" || arg === "-e") {
      const value = argv[i + 1];
      if (value) {
        assignExchange(options, value);
        i += 1;
      }
      continue;
    }
  }

  return options;
}

function assignStrategy(options: CliOptions, raw: string): void {
  const normalized = raw.trim().toLowerCase();
  if (!normalized) return;
  if (STRATEGY_VALUES.has(normalized as StrategyId)) {
    options.strategy = normalized as StrategyId;
  } else if (normalized === "offset" || normalized === "offsetmaker" || normalized === "offset-maker") {
    options.strategy = "offset-maker";
  } else if (normalized === "makerpoints" || normalized === "maker-points" || normalized === "maker_points") {
    options.strategy = "maker-points";
  }
}

function assignExchange(options: CliOptions, raw: string): void {
  const normalized = raw.trim().toLowerCase();
  if (!normalized) return;
  if (
    normalized === "aster" ||
    normalized === "grvt" ||
    normalized === "lighter" ||
    normalized === "backpack" ||
    normalized === "paradex" ||
    normalized === "nado" ||
    normalized === "standx"
  ) {
    options.exchange = normalized as CliOptions["exchange"];
  } else if (normalized === "gravity" || normalized === "grav" || normalized === "grv") {
    options.exchange = "grvt";
  }
}

export function printCliHelp(): void {
  // eslint-disable-next-line no-console
  console.log(`Usage: bun run index.ts [--strategy <trend|guardian|maker|maker-points|offset-maker|basis|grid>] [--exchange <aster|grvt|lighter|backpack|paradex|nado|standx>] [--silent]\n\n` +
    `Options:\n` +
    `  --strategy, -s    Automatically start the specified strategy without the interactive menu.\n` +
    `                    Aliases: offset, offset-maker for the offset maker engine.\n` +
    `  --exchange, -e    Choose exchange. Overrides EXCHANGE/TRADE_EXCHANGE environment variables.\n` +
    `  --silent, -q      Reduce console output. When used with --strategy, runs in silent daemon mode.\n` +
    `  --help, -h        Show this help message.\n`);
}