import { getCliConfigValue } from "./helpers.smartconfig.js";

export type TCliOutputMode = "human" | "plain" | "json";

export interface ICliMode {
  output: TCliOutputMode;
  interactive: boolean;
  json: boolean;
  plain: boolean;
  quiet: boolean;
  yes: boolean;
  help: boolean;
  agent: boolean;
  checkUpdates: boolean;
  isTty: boolean;
  command?: string;
}

interface ICliConfigSettings {
  interactive?: boolean;
  output?: TCliOutputMode;
  checkUpdates?: boolean;
}

type TArgSource = Record<string, any> & { _?: string[] };

const camelCase = (value: string): string => {
  return value.replace(/-([a-z])/g, (_match, group: string) =>
    group.toUpperCase(),
  );
};

const getArgValue = (argvArg: TArgSource, key: string): any => {
  const keyVariants = [key, camelCase(key), key.replace(/-/g, "")];
  for (const keyVariant of keyVariants) {
    if (argvArg[keyVariant] !== undefined) {
      return argvArg[keyVariant];
    }
  }
  return undefined;
};

const parseRawArgv = (argv: string[]): TArgSource => {
  const parsedArgv: TArgSource = { _: [] };

  for (let i = 0; i < argv.length; i++) {
    const currentArg = argv[i];

    if (currentArg.startsWith("--no-")) {
      const key = currentArg.slice(5);
      parsedArgv[key] = false;
      parsedArgv[camelCase(key)] = false;
      continue;
    }

    if (currentArg.startsWith("--")) {
      const withoutPrefix = currentArg.slice(2);
      const [rawKey, inlineValue] = withoutPrefix.split("=", 2);
      if (inlineValue !== undefined) {
        parsedArgv[rawKey] = inlineValue;
        parsedArgv[camelCase(rawKey)] = inlineValue;
        continue;
      }

      const nextArg = argv[i + 1];
      if (nextArg && !nextArg.startsWith("-")) {
        parsedArgv[rawKey] = nextArg;
        parsedArgv[camelCase(rawKey)] = nextArg;
        i++;
      } else {
        parsedArgv[rawKey] = true;
        parsedArgv[camelCase(rawKey)] = true;
      }
      continue;
    }

    if (currentArg.startsWith("-") && currentArg.length > 1) {
      for (const shortFlag of currentArg.slice(1).split("")) {
        parsedArgv[shortFlag] = true;
      }
      continue;
    }

    parsedArgv._ = parsedArgv._ || [];
    parsedArgv._.push(currentArg);
  }

  return parsedArgv;
};

const normalizeOutputMode = (value: unknown): TCliOutputMode | undefined => {
  if (value === "human" || value === "plain" || value === "json") {
    return value;
  }
  return undefined;
};

const resolveCliMode = (
  argvArg: TArgSource,
  cliConfig: ICliConfigSettings,
): ICliMode => {
  const isTty = Boolean(process.stdout?.isTTY && process.stdin?.isTTY);
  const agentMode = Boolean(getArgValue(argvArg, "agent"));
  const outputOverride = normalizeOutputMode(getArgValue(argvArg, "output"));

  let output: TCliOutputMode =
    normalizeOutputMode(cliConfig.output) || (isTty ? "human" : "plain");
  if (agentMode || getArgValue(argvArg, "json")) {
    output = "json";
  } else if (getArgValue(argvArg, "plain")) {
    output = "plain";
  } else if (outputOverride) {
    output = outputOverride;
  }

  const interactiveSetting = getArgValue(argvArg, "interactive");
  let interactive = cliConfig.interactive ?? isTty;
  if (interactiveSetting === true) {
    interactive = true;
  } else if (interactiveSetting === false) {
    interactive = false;
  }
  if (!isTty || output !== "human" || agentMode) {
    interactive = false;
  }

  const checkUpdatesSetting = getArgValue(argvArg, "check-updates");
  let checkUpdates = cliConfig.checkUpdates ?? output === "human";
  if (checkUpdatesSetting === true) {
    checkUpdates = true;
  } else if (checkUpdatesSetting === false) {
    checkUpdates = false;
  }
  if (output !== "human" || agentMode) {
    checkUpdates = false;
  }

  return {
    output,
    interactive,
    json: output === "json",
    plain: output === "plain",
    quiet: Boolean(
      getArgValue(argvArg, "quiet") ||
      getArgValue(argvArg, "q") ||
      output === "json",
    ),
    yes: Boolean(getArgValue(argvArg, "yes") || getArgValue(argvArg, "y")),
    help: Boolean(
      getArgValue(argvArg, "help") ||
      getArgValue(argvArg, "h") ||
      argvArg._?.[0] === "help",
    ),
    agent: agentMode,
    checkUpdates,
    isTty,
    command: argvArg._?.[0],
  };
};

const getCliModeConfig = async (): Promise<ICliConfigSettings> => {
  return await getCliConfigValue<ICliConfigSettings>("cli", {});
};

export const getCliMode = async (
  argvArg: TArgSource = {},
): Promise<ICliMode> => {
  const cliConfig = await getCliModeConfig();
  return resolveCliMode(argvArg, cliConfig);
};

export const getRawCliMode = async (): Promise<ICliMode> => {
  const cliConfig = await getCliModeConfig();
  const rawArgv = parseRawArgv(process.argv.slice(2));
  return resolveCliMode(rawArgv, cliConfig);
};

export const printJson = (data: unknown): void => {
  console.log(JSON.stringify(data, null, 2));
};

export const runWithSuppressedOutput = async <T>(
  fn: () => Promise<T>,
): Promise<T> => {
  const originalConsole = {
    log: console.log,
    info: console.info,
    warn: console.warn,
    error: console.error,
  };
  const originalStdoutWrite = process.stdout.write.bind(process.stdout);
  const originalStderrWrite = process.stderr.write.bind(process.stderr);
  const noop = () => undefined;

  console.log = noop;
  console.info = noop;
  console.warn = noop;
  console.error = noop;
  process.stdout.write = (() => true) as typeof process.stdout.write;
  process.stderr.write = (() => true) as typeof process.stderr.write;

  try {
    return await fn();
  } finally {
    console.log = originalConsole.log;
    console.info = originalConsole.info;
    console.warn = originalConsole.warn;
    console.error = originalConsole.error;
    process.stdout.write = originalStdoutWrite;
    process.stderr.write = originalStderrWrite;
  }
};